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Volume 46,Issue 2,2019 Table of Contents
2019, 46(2):1-5.
Abstract:
The speed loop of the vector control of permanent magnet linear synchronous motor (PMLSM) was usually controlled by PI. The traditional PI controller has some shortcomings such as overshoot in the starting process and long adjusting time under load disturbance. In order to improve the servo performance, sliding mode control was applied to the servo system, but its shortcoming was buffeting. Therefore, a sliding mode control method based on endocrine hormone regulation was proposed, which could effectively reduce the overshoot of speed and shorten the adjusting time when the hormone was disturbed by external disturbance by using the ultra short feedback mechanism of hormone secretion. The simulation model of the system was built in MATLAB. The simulation results showed that the control performance of speed and thrust was remarkable and excellent, and was better than the traditional PI control and sliding mode control.
The speed loop of the vector control of permanent magnet linear synchronous motor (PMLSM) was usually controlled by PI. The traditional PI controller has some shortcomings such as overshoot in the starting process and long adjusting time under load disturbance. In order to improve the servo performance, sliding mode control was applied to the servo system, but its shortcoming was buffeting. Therefore, a sliding mode control method based on endocrine hormone regulation was proposed, which could effectively reduce the overshoot of speed and shorten the adjusting time when the hormone was disturbed by external disturbance by using the ultra short feedback mechanism of hormone secretion. The simulation model of the system was built in MATLAB. The simulation results showed that the control performance of speed and thrust was remarkable and excellent, and was better than the traditional PI control and sliding mode control.
2019, 46(2):6-9, 19.
Abstract:
In order to reduce the dynamic error in the permanent magnet synchronous motor (PMSM) speed control, a sliding mode control (SMC) method with optimal integral performance was proposed. In this method, the dynamic error in SMC was taken as the performance index. On this basis, the optimal switching function was established, and the optimal control theory was used to design the sliding mode controller. The SMC system designed by this method could speed up the process of the system state variable reaching the sliding surface by continuously changing the slope of the sliding surface, and greatly improve the robustness to parameter perturbation and external disturbance. The simulation results showed that the timevarying sliding surface control method had the advantages of no overshoot, rapidity and stability, and improved the robustness of the system.
In order to reduce the dynamic error in the permanent magnet synchronous motor (PMSM) speed control, a sliding mode control (SMC) method with optimal integral performance was proposed. In this method, the dynamic error in SMC was taken as the performance index. On this basis, the optimal switching function was established, and the optimal control theory was used to design the sliding mode controller. The SMC system designed by this method could speed up the process of the system state variable reaching the sliding surface by continuously changing the slope of the sliding surface, and greatly improve the robustness to parameter perturbation and external disturbance. The simulation results showed that the timevarying sliding surface control method had the advantages of no overshoot, rapidity and stability, and improved the robustness of the system.
3 Fuzzy Adaptive PI Control of FaultTolerant Permanet MagnetMotor Applied in Electric Propulsion Ship
2019, 46(2):10-14, 19.
Abstract:
Faulttolerant permanent magnet motor (FTPMM) combines the merits of permanent magnet synchronous motor and switch reluctance motor, so it can be used as the propulsion motor of electric propulsion ship. On the basis of analyzing the structure and mathematical model of FTPMM, the fuzzy adaptive PI control strategy was proposed. During the control process, if the error was large, the control weight of error would be increased so as to improve the response speed; if the error was small, the control weight of the change of error would be raised, so that the system could reach the steady state as soon as possible. The simulation model of electric propulsion ship system using the fuzzy adaptive PI control strategy in propulsion motor was built in MATLAB/simulink. From the simulation results, it was proved that the dynamic and static properties of FTPMM were improved in comparison with the traditional PI control, and the fuzzy adaptive PI control was suitable for the application in marine electric propulsion system.
Faulttolerant permanent magnet motor (FTPMM) combines the merits of permanent magnet synchronous motor and switch reluctance motor, so it can be used as the propulsion motor of electric propulsion ship. On the basis of analyzing the structure and mathematical model of FTPMM, the fuzzy adaptive PI control strategy was proposed. During the control process, if the error was large, the control weight of error would be increased so as to improve the response speed; if the error was small, the control weight of the change of error would be raised, so that the system could reach the steady state as soon as possible. The simulation model of electric propulsion ship system using the fuzzy adaptive PI control strategy in propulsion motor was built in MATLAB/simulink. From the simulation results, it was proved that the dynamic and static properties of FTPMM were improved in comparison with the traditional PI control, and the fuzzy adaptive PI control was suitable for the application in marine electric propulsion system.
2019, 46(2):15-19.
Abstract:
In the case of high speed weak magnetic field or high overload requirements of the motor, it was necessary to improve the voltage utilization rate of DC bus through pulse width modulation (PWM) overmodulation operation. The sensorless permanent magnet synchronous motor (PMSM) vector control (field oriented control, FOC) technology based on flux observation had the advantages of simple algorithm and easy implementation, but the voltage limiting link in the case of overmodulation would cause the error of flux observation and rotor position angle estimation. In order to improve the control performance of the system under PWM overmodulation, the traditional FOC control block diagram was improved, which eliminated the voltage limiting link and caculated the actual voltage obtained from duty ratio to estimate the stator flux linkage. MATLAB simulation verified the effectiveness of this method. The results showed that the new method could make full use of the inherent limiting characteristics of PWM, which could not only simplify the control algorithm but also improve the accuracy of flux observation, and had good technical and economic performance.
In the case of high speed weak magnetic field or high overload requirements of the motor, it was necessary to improve the voltage utilization rate of DC bus through pulse width modulation (PWM) overmodulation operation. The sensorless permanent magnet synchronous motor (PMSM) vector control (field oriented control, FOC) technology based on flux observation had the advantages of simple algorithm and easy implementation, but the voltage limiting link in the case of overmodulation would cause the error of flux observation and rotor position angle estimation. In order to improve the control performance of the system under PWM overmodulation, the traditional FOC control block diagram was improved, which eliminated the voltage limiting link and caculated the actual voltage obtained from duty ratio to estimate the stator flux linkage. MATLAB simulation verified the effectiveness of this method. The results showed that the new method could make full use of the inherent limiting characteristics of PWM, which could not only simplify the control algorithm but also improve the accuracy of flux observation, and had good technical and economic performance.
2019, 46(2):20-24, 31.
Abstract:
When using PI controller, overshoot of speed was prone to occur during the motor startup process. To solve the problems of overshoot and slow tracking in the startup process of series multiphase motor system, an improved active disturbance rejection controller (ADRC) to substitute PI controller in the series system of asymmetric sixphase dual permanent magnet synchronous motors (PMSMs) was studies. Then, the genetic algorithm was introduced to optimize the module parameter of proposed method by optimization criterion of minimum overshoot. Finally, an asymmetric sixphase dual PMSM series system based on improved ADRC was built in MATLAB/Simulink. The simulation results showed that the method used had fast adjustment and accurate tracking effect, compared with the traditional PI control. In the meantime, the influence of harmonic current and torque ripple could be well weakened. All of these verified the practicability of this control strategy.
When using PI controller, overshoot of speed was prone to occur during the motor startup process. To solve the problems of overshoot and slow tracking in the startup process of series multiphase motor system, an improved active disturbance rejection controller (ADRC) to substitute PI controller in the series system of asymmetric sixphase dual permanent magnet synchronous motors (PMSMs) was studies. Then, the genetic algorithm was introduced to optimize the module parameter of proposed method by optimization criterion of minimum overshoot. Finally, an asymmetric sixphase dual PMSM series system based on improved ADRC was built in MATLAB/Simulink. The simulation results showed that the method used had fast adjustment and accurate tracking effect, compared with the traditional PI control. In the meantime, the influence of harmonic current and torque ripple could be well weakened. All of these verified the practicability of this control strategy.
2019, 46(2):25-31.
Abstract:
Single stage Z-source three-level neutral point clamped (NPC) inverter combines voltage-boost and inversion functions, and it has the advantages of simple structure and high efficiency. A constant power grid-connected control method for Z-source NPC three-level inverter based on space vector pulse width modulation (SVPWM) was proposed. First, the structure and working principle of Z-source three-level NPC inverter was analyzed. Then, the constant power control strategy was introduced to Z-source three-level NPC inverter grid-connected system. Finally, simulation model of the system was built in MATLAB/Simulink software. The simulation results showed that Z-source NPC three-level inverter could boost the step-up ratio, this control method could make the output active and reactive power of the grid inverter track the set value effectively, and grid current harmonic content components were low.
Single stage Z-source three-level neutral point clamped (NPC) inverter combines voltage-boost and inversion functions, and it has the advantages of simple structure and high efficiency. A constant power grid-connected control method for Z-source NPC three-level inverter based on space vector pulse width modulation (SVPWM) was proposed. First, the structure and working principle of Z-source three-level NPC inverter was analyzed. Then, the constant power control strategy was introduced to Z-source three-level NPC inverter grid-connected system. Finally, simulation model of the system was built in MATLAB/Simulink software. The simulation results showed that Z-source NPC three-level inverter could boost the step-up ratio, this control method could make the output active and reactive power of the grid inverter track the set value effectively, and grid current harmonic content components were low.
2019, 46(2):32-39.
Abstract:
Due to the fact that only one adaptive coefficient could be adjusted in traditional Landau method for inertia identification, it was difficult to obtain both good identification speed and identification accuracy, leading to the instability of the speed adaptive control system in the case of large measurement noise. To solve this problem, a Landau method for inertia identification considering measurement noise was proposed. By using the same lowpass filter for both the speed and the electromagnetic torque, the reference model was the same as the one without filter. On this basis, both the adaptive coefficient and the time constant of the filter were adjusted for the same identification speed while with better noise suppression, so as to improve the inertia identification accuracy and the stability of the speed adaptive control system. The correctness and effectiveness of the proposed method were verified by simulations and experiments.
Due to the fact that only one adaptive coefficient could be adjusted in traditional Landau method for inertia identification, it was difficult to obtain both good identification speed and identification accuracy, leading to the instability of the speed adaptive control system in the case of large measurement noise. To solve this problem, a Landau method for inertia identification considering measurement noise was proposed. By using the same lowpass filter for both the speed and the electromagnetic torque, the reference model was the same as the one without filter. On this basis, both the adaptive coefficient and the time constant of the filter were adjusted for the same identification speed while with better noise suppression, so as to improve the inertia identification accuracy and the stability of the speed adaptive control system. The correctness and effectiveness of the proposed method were verified by simulations and experiments.
2019, 46(2):40-45.
Abstract:
The omnidirectional motion platform system was a 2D motion platform that could realize walking of the human body in various directions. In order to realize the motion control of the human body in the omnidirectional motion platform, the firstorder control algorithm added to the observer to explore the motion control of the platform was used. Firstly, the algorithm was simulated by MATLAB software to verify the feasibility of the method. Then, the effectiveness of the control algorithm was verified by field tests. Experiments showed that the firstorder control algorithm added to the observer achieved effective motion control for the omnidirectional motion platform. The exploration of this motion control strategy provided a feasible control idea and solution for motion control of the omnidirectional motion platforms.
The omnidirectional motion platform system was a 2D motion platform that could realize walking of the human body in various directions. In order to realize the motion control of the human body in the omnidirectional motion platform, the firstorder control algorithm added to the observer to explore the motion control of the platform was used. Firstly, the algorithm was simulated by MATLAB software to verify the feasibility of the method. Then, the effectiveness of the control algorithm was verified by field tests. Experiments showed that the firstorder control algorithm added to the observer achieved effective motion control for the omnidirectional motion platform. The exploration of this motion control strategy provided a feasible control idea and solution for motion control of the omnidirectional motion platforms.
2019, 46(2):46-51.
Abstract:
In order to solve the problem that it was difficult for permanent magnet synchronous motor to reconstruct the current in the low modulation area and the boundary area of the sector when the singleresistance current was sampled, a novel singleresistance current reconstruction technique was proposed. Firstly, the principle of threephase current reconstruction technique was studied, the region in which the current was unable to reconstruct was defined as nonobservation area, and the blind region of current reconstruction in the nonobservation area was analyzed. Secondly, using the pulse width modulation (PWM) shift method to reconstruct the current in the nonobservation area, it was found that there were still some nonobservation areas where only the singlephase current could be measured and the current could not be reconstructed. Aiming at this problem, the current observer without the motor and load parameters was designed to estimate the threephase current, which was easy to implement. Finally, the experimental results showed that the proposed novel singleresistor current reconstruction technique was feasible and valuable.
In order to solve the problem that it was difficult for permanent magnet synchronous motor to reconstruct the current in the low modulation area and the boundary area of the sector when the singleresistance current was sampled, a novel singleresistance current reconstruction technique was proposed. Firstly, the principle of threephase current reconstruction technique was studied, the region in which the current was unable to reconstruct was defined as nonobservation area, and the blind region of current reconstruction in the nonobservation area was analyzed. Secondly, using the pulse width modulation (PWM) shift method to reconstruct the current in the nonobservation area, it was found that there were still some nonobservation areas where only the singlephase current could be measured and the current could not be reconstructed. Aiming at this problem, the current observer without the motor and load parameters was designed to estimate the threephase current, which was easy to implement. Finally, the experimental results showed that the proposed novel singleresistor current reconstruction technique was feasible and valuable.
10 Rotor Loss of Surface Permanent Magnet Synchronous Motor withFractionalSlot Concentrated Windings
2019, 46(2):52-56, 71.
Abstract:
Considering the difficulty to calculate rotor losses accurately by loss model and too much time by threedimensional finite element method, the rotor loss of a 36 slots 42 poles singlelayer surface permanent magnet synchronous motor with fractionalslot concentrated winding was calculated based on the twodimensional motion transient finite element method operating at maximum torque both in constant torque region and in fluxweakening region. Additionally, the effects of the number of axial segments, slot width and air gap thickness on the loss of permanent magnets at high speed were investigated. It was shown that the magnet loss accounted for more than 90% of the total rotor loss in the whole speed range, the hysteresis loss of the rotor core was higher than the eddy current loss when the speed was lower than 1 500 r/min, and the eddy current loss was obviously higher than the hysteresis loss when the speed was higher than 1 500 r/min. The eddy current loss of the magnet could be reduced obviously by segmenting the permanent magnet; changing slot width contributed nothing to magnet loss under load condition;increasing the air gap width had no obvious effect on reducing the loss of permanent magnet. Meanwhile, changing the slot width and the thickness of the air gap would change the inductance and affect the performance of the motor.
Considering the difficulty to calculate rotor losses accurately by loss model and too much time by threedimensional finite element method, the rotor loss of a 36 slots 42 poles singlelayer surface permanent magnet synchronous motor with fractionalslot concentrated winding was calculated based on the twodimensional motion transient finite element method operating at maximum torque both in constant torque region and in fluxweakening region. Additionally, the effects of the number of axial segments, slot width and air gap thickness on the loss of permanent magnets at high speed were investigated. It was shown that the magnet loss accounted for more than 90% of the total rotor loss in the whole speed range, the hysteresis loss of the rotor core was higher than the eddy current loss when the speed was lower than 1 500 r/min, and the eddy current loss was obviously higher than the hysteresis loss when the speed was higher than 1 500 r/min. The eddy current loss of the magnet could be reduced obviously by segmenting the permanent magnet; changing slot width contributed nothing to magnet loss under load condition;increasing the air gap width had no obvious effect on reducing the loss of permanent magnet. Meanwhile, changing the slot width and the thickness of the air gap would change the inductance and affect the performance of the motor.
2019, 46(2):57-65, 94.
Abstract:
The basic mathematical equations of the 15° shifted dual twelvephase nonsalient pole synchronous rectifier generator were established in the abc and dq0 coordinate systems respectively, and the motor voltage, flux linkage, output power, electromagnetic torque and rotor motion equation were derived. The simulation model of 15° shifted dual twelvephase nonsalient pole synchronous rectifier generator was set up in MATLAB/Simulink. The unbalanced load simulation and test were carried out on the two outputs, and the correctness of the mathematical model of the double twelvephase nonsalient synchronous rectifier generator was verified by the basically consistent results of simulation and test. A foundation for the research on the operation performance and excitation control system of the dual twelvephase nonsalient pole synchronous rectifier generator was laid.
The basic mathematical equations of the 15° shifted dual twelvephase nonsalient pole synchronous rectifier generator were established in the abc and dq0 coordinate systems respectively, and the motor voltage, flux linkage, output power, electromagnetic torque and rotor motion equation were derived. The simulation model of 15° shifted dual twelvephase nonsalient pole synchronous rectifier generator was set up in MATLAB/Simulink. The unbalanced load simulation and test were carried out on the two outputs, and the correctness of the mathematical model of the double twelvephase nonsalient synchronous rectifier generator was verified by the basically consistent results of simulation and test. A foundation for the research on the operation performance and excitation control system of the dual twelvephase nonsalient pole synchronous rectifier generator was laid.
2019, 46(2):66-71.
Abstract:
When the main dimensions of a generator are fixed, the damper winding performance is the most important factor affecting the subtransient reactance of the generator. According to different situations, the end users have different requirements for subtransient reactance. The adjustment of damper winding could basically meet the requirements of the special subtransient reactance. The subtransient reactance of a 3 MW synchronous generator damper winding with different materials or different bar numbers was calculated. The calculation results were verified by low voltage sudden short circuit testing, and then the optimal damper winding design was obtained.
When the main dimensions of a generator are fixed, the damper winding performance is the most important factor affecting the subtransient reactance of the generator. According to different situations, the end users have different requirements for subtransient reactance. The adjustment of damper winding could basically meet the requirements of the special subtransient reactance. The subtransient reactance of a 3 MW synchronous generator damper winding with different materials or different bar numbers was calculated. The calculation results were verified by low voltage sudden short circuit testing, and then the optimal damper winding design was obtained.
2019, 46(2):72-76.
Abstract:
The overload capability of permanent magnet synchronous motor (PMSM) was restricted by core saturation and armature reaction. Conventional design of PMSM could not meet the requirements of some high overload applications. The influencing factors of the overload capacity of PMSM were analyzed. The influences of structural parameters such as stator crack ratio, permanent magnet thickness and air gap length were studied. The influence rules of relevant structural parameters on the overload capacity of PMSM were analyzed. A high overload capacity PMSM with rated power of 1 kW was designed. The finite element simulation results showed that this motor could achieve 5.26 times overload capability.
The overload capability of permanent magnet synchronous motor (PMSM) was restricted by core saturation and armature reaction. Conventional design of PMSM could not meet the requirements of some high overload applications. The influencing factors of the overload capacity of PMSM were analyzed. The influences of structural parameters such as stator crack ratio, permanent magnet thickness and air gap length were studied. The influence rules of relevant structural parameters on the overload capacity of PMSM were analyzed. A high overload capacity PMSM with rated power of 1 kW was designed. The finite element simulation results showed that this motor could achieve 5.26 times overload capability.
2019, 46(2):77-81.
Abstract:
The common control chips in motor control were DSP, ARM, microcontroller unit (MCU), etc. These chips needed to be manually programmed for motor controll applications according to the designed algorithm, and the development cycle was long. The semiphysical simulation system dSPACE offered a good solution for this problem, and on this basis, the controller development cycle was greatly shortened. We introduced the hardware protection and software protection of motor control in principle and analyzed the conflicts caused by IPM dead zone protection and dSPACE dead zone module implementation. The conflict problem was solved by using a coordination circuit. Theoretical analysis and test results of the fabricated control panel showed that this method could meet the requirements of dead zone protection and hardware protection as well as the normal operation of IPM.
The common control chips in motor control were DSP, ARM, microcontroller unit (MCU), etc. These chips needed to be manually programmed for motor controll applications according to the designed algorithm, and the development cycle was long. The semiphysical simulation system dSPACE offered a good solution for this problem, and on this basis, the controller development cycle was greatly shortened. We introduced the hardware protection and software protection of motor control in principle and analyzed the conflicts caused by IPM dead zone protection and dSPACE dead zone module implementation. The conflict problem was solved by using a coordination circuit. Theoretical analysis and test results of the fabricated control panel showed that this method could meet the requirements of dead zone protection and hardware protection as well as the normal operation of IPM.
2019, 46(2):82-86.
Abstract:
Necessity and advantages of the hotpressing technology for formed coil of the mediumsized motors was described. The course of hotpressing technology and the optimal selection of different types of hotpressing technology were expounded. The outdated hotpressing process was changed radically by a new technology of hotpressing, which could raise product manufacturability and responsibility. According to the data of hotpressing force and finite element analysis of deformation distribution of linear edges under the combined action of steady thermal and static stress, the influence of some parameters of hot press on the surface of the coils could be obtained. It provided a reference for the selection of hotpressing process parameters.
Necessity and advantages of the hotpressing technology for formed coil of the mediumsized motors was described. The course of hotpressing technology and the optimal selection of different types of hotpressing technology were expounded. The outdated hotpressing process was changed radically by a new technology of hotpressing, which could raise product manufacturability and responsibility. According to the data of hotpressing force and finite element analysis of deformation distribution of linear edges under the combined action of steady thermal and static stress, the influence of some parameters of hot press on the surface of the coils could be obtained. It provided a reference for the selection of hotpressing process parameters.
2019, 46(2):87-94.
Abstract:
The correct detection of phase current was the premise to realize torque control in brushless DC motor (BLDCM) direct torque control system. The relationship between electromagnetic torque and phase current of BLDCM was studied. The hardware circuit and software algorithm of phase current detection were designed. The phase current was detected by Hall current sensor and transferred to the AD conversion module of DSP through conditioning circuit. For the offset and gain error caused by AD conversion, the least square method and linear fitting function were used to correct the data. Aiming at the accidental error caused by individual data, a current composite filtering method was proposed. A firstorder lag filter was added to the AD correction for periodic interference. The experimental results showed that the phase current detection and processing method greatly reduce the current measurement error, realized the realtime observation and direct control of torque, and effectively inhibited the torque ripple.
The correct detection of phase current was the premise to realize torque control in brushless DC motor (BLDCM) direct torque control system. The relationship between electromagnetic torque and phase current of BLDCM was studied. The hardware circuit and software algorithm of phase current detection were designed. The phase current was detected by Hall current sensor and transferred to the AD conversion module of DSP through conditioning circuit. For the offset and gain error caused by AD conversion, the least square method and linear fitting function were used to correct the data. Aiming at the accidental error caused by individual data, a current composite filtering method was proposed. A firstorder lag filter was added to the AD correction for periodic interference. The experimental results showed that the phase current detection and processing method greatly reduce the current measurement error, realized the realtime observation and direct control of torque, and effectively inhibited the torque ripple.
17 Noise Research Method of Permanent Magnet Synchronous Motor withSpectrum Analysis Based on MATLAB
2019, 46(2):95-100.
Abstract:
A 200 kW permanent magnet synchronous reluctance motor was designed. However, it was found that the prototype motor made noises when the rotor speed was close to 2 600 r/min. An easier analysis method of the motor’s noise was proposed. The noises of the motor were analyzed by the MATLAB software. The resonance frequencies of the components of the motor were analyzed using the finite element analysis method. The noise source of the motor was confirmed by comparing the motor noise spectrum with the analyzed resonance frequencies. According to the experimental result, the noise of the motor was visibly reduced after optimal design.
A 200 kW permanent magnet synchronous reluctance motor was designed. However, it was found that the prototype motor made noises when the rotor speed was close to 2 600 r/min. An easier analysis method of the motor’s noise was proposed. The noises of the motor were analyzed by the MATLAB software. The resonance frequencies of the components of the motor were analyzed using the finite element analysis method. The noise source of the motor was confirmed by comparing the motor noise spectrum with the analyzed resonance frequencies. According to the experimental result, the noise of the motor was visibly reduced after optimal design.
2019, 46(2):101-108, 113.
Abstract:
Inwheel motor had the advantages of compact structure, high transmission efficiency, flexible control and steering, etc. Electric vehicle driven by inwheel motor was an important development direction of new energy vehicle in the future. Permanent magnet synchronous motor was a better choice for inwheel drive motor because of its high efficiency, high power density and good reliability. The application situation of inwheel motor to electric vehicle at home and abroad was summarized, and the research and work of electromagnetic design optimization, control strategy, heat dissipation mode and structure of inwheel motor were introduced. Finally, the problems of inwheel motor in China were discussed, and the future development directions of inwheel motor were prospected.
Inwheel motor had the advantages of compact structure, high transmission efficiency, flexible control and steering, etc. Electric vehicle driven by inwheel motor was an important development direction of new energy vehicle in the future. Permanent magnet synchronous motor was a better choice for inwheel drive motor because of its high efficiency, high power density and good reliability. The application situation of inwheel motor to electric vehicle at home and abroad was summarized, and the research and work of electromagnetic design optimization, control strategy, heat dissipation mode and structure of inwheel motor were introduced. Finally, the problems of inwheel motor in China were discussed, and the future development directions of inwheel motor were prospected.
2019, 46(2):109-113.
Abstract:
In the design process of traditional lowvoltage electric vehicle switched reluctance motor (SRM) drive system, the first consideration was the volume and cost of the system. Generally, the isolation of the digital ground and the power ground was always neglected in the design of the MOSFET driving circuits and the phase current and bus voltage sampling circuits, which deteriorated the reliability greatly in the driving system. Based on the traditional drive circuit and resistance sampling circuit in nonisolated drive system, a highspeed optocoupler was proposed to isolate the PWM control signal from the MOSFET drive signal, and a linear optocoupler was used to isolate the phase current sampling signal and bus voltage sampling signal from the AD sampling signal of the controller. This method could achieve the isolation of digital ground and power ground without increasing too much the system size and cost, and thus further improve the reliability of lowvoltage electric vehicle SRM drive system. The proposed method had important application prospects.
In the design process of traditional lowvoltage electric vehicle switched reluctance motor (SRM) drive system, the first consideration was the volume and cost of the system. Generally, the isolation of the digital ground and the power ground was always neglected in the design of the MOSFET driving circuits and the phase current and bus voltage sampling circuits, which deteriorated the reliability greatly in the driving system. Based on the traditional drive circuit and resistance sampling circuit in nonisolated drive system, a highspeed optocoupler was proposed to isolate the PWM control signal from the MOSFET drive signal, and a linear optocoupler was used to isolate the phase current sampling signal and bus voltage sampling signal from the AD sampling signal of the controller. This method could achieve the isolation of digital ground and power ground without increasing too much the system size and cost, and thus further improve the reliability of lowvoltage electric vehicle SRM drive system. The proposed method had important application prospects.
2019, 46(2):114-119.
Abstract:
The permanent magnet motor for new energy automobile was introduced. The quadraturedirect axis inductance, electromagnetic torque and magnetic resistance torque properties were analyzed by finite element method for four kinds of motors with different rotor structures: “V” type, “V—” type, doublearc type, and “U—” type. The flux weakening capability and the factors influencing flux weakening capability were analyzed, and the efficiency maps of different rotor structures were given by simulation. By comparing and analyzing the characteristics of different rotor structures, it was concluded that different rotor magnetic circuit structures were suitable for different new energy automobile applications.
The permanent magnet motor for new energy automobile was introduced. The quadraturedirect axis inductance, electromagnetic torque and magnetic resistance torque properties were analyzed by finite element method for four kinds of motors with different rotor structures: “V” type, “V—” type, doublearc type, and “U—” type. The flux weakening capability and the factors influencing flux weakening capability were analyzed, and the efficiency maps of different rotor structures were given by simulation. By comparing and analyzing the characteristics of different rotor structures, it was concluded that different rotor magnetic circuit structures were suitable for different new energy automobile applications.
2019, 46(2):120-125.
Abstract:
With the more and more intelligent development of wind turbine, in addition to requiring the reliability of wind turbine operation, it was also required that the wind turbine should have a stable output power curve in different environments. In order to make the variable pitch controller of wind turbines have good dynamic performance during operation, a variable pitch control scheme of active disturbance rejection control (ADRC) was proposed. But the ADRC also had the obvious disadvantage that many parameters were difficult to set. Therefore, the teachinglearning based algorithm were applied to the ADRC tuning process, and the parameters were automatically set. The simulation results verified the feasibility of autosetting ADRC parameters by teachinglearning based algorithm. Compared with traditional PID controller, the set ADRC could better meet the requirements of variable pitch control of wind turbine and effectively maintain the stability of wind turbine output power.
With the more and more intelligent development of wind turbine, in addition to requiring the reliability of wind turbine operation, it was also required that the wind turbine should have a stable output power curve in different environments. In order to make the variable pitch controller of wind turbines have good dynamic performance during operation, a variable pitch control scheme of active disturbance rejection control (ADRC) was proposed. But the ADRC also had the obvious disadvantage that many parameters were difficult to set. Therefore, the teachinglearning based algorithm were applied to the ADRC tuning process, and the parameters were automatically set. The simulation results verified the feasibility of autosetting ADRC parameters by teachinglearning based algorithm. Compared with traditional PID controller, the set ADRC could better meet the requirements of variable pitch control of wind turbine and effectively maintain the stability of wind turbine output power.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
