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Volume 44,Issue 5,2017 Table of Contents
2017, 44(5):1-12, 26.
Abstract:
When being equipped with the field winding for adjusting the magnetic field, permanent magnet motor was changed into hybrid excitation motor (HEM), a novel motor. The HEM combined the advantage of permanent motor machine and electrically excited motor, enjoying a wide application prospect. The fluxadjusting principle of HEM was presented. In the perspective of the machine prototype, the developing strategy of HEM was analyzed. A method, focusing on the excitation structure, was proposed to understand the HEM. Basing on the electromagnetic characteristic of HEM, the control ideas and systems configurations were researched for HEM used in some areas such as automobile, wind power generation, aviation and aerospace. At the end, recommended a guiding ideology to study HEM and outlooked its developing trend.
When being equipped with the field winding for adjusting the magnetic field, permanent magnet motor was changed into hybrid excitation motor (HEM), a novel motor. The HEM combined the advantage of permanent motor machine and electrically excited motor, enjoying a wide application prospect. The fluxadjusting principle of HEM was presented. In the perspective of the machine prototype, the developing strategy of HEM was analyzed. A method, focusing on the excitation structure, was proposed to understand the HEM. Basing on the electromagnetic characteristic of HEM, the control ideas and systems configurations were researched for HEM used in some areas such as automobile, wind power generation, aviation and aerospace. At the end, recommended a guiding ideology to study HEM and outlooked its developing trend.
2017, 44(5):13-16.
Abstract:
The causes and phenomena of variable frequency motor insulation aging system were introduced. The test standards and test methods of thermal aging, pulse electrical aging, environmental aging and multi factor aging were summarized, pointed out the existing problems in the stage of test method, put forward the development trend in the future.
The causes and phenomena of variable frequency motor insulation aging system were introduced. The test standards and test methods of thermal aging, pulse electrical aging, environmental aging and multi factor aging were summarized, pointed out the existing problems in the stage of test method, put forward the development trend in the future.
2017, 44(5):17-21, 45.
Abstract:
To solve the problem of high sampling rate and uncertain switching frequency in finitecontrolset, odel predictive control (FCSMPC) of threephase voltage type pulse width modulation (PWM) rectifier, a kind of constant switching frequency method was proposed. The voltage of AC side of rectifier which would be effected in the next sampling period was obtained by solving cost function, then the voltage would be produced by using space vector pulse width modulation method to achieve constant switching frequency. Simulation and experimental results showed that the proposed control algorithm had constant switching frequency, low harmonic content and the rectifier operates with high power factor.
To solve the problem of high sampling rate and uncertain switching frequency in finitecontrolset, odel predictive control (FCSMPC) of threephase voltage type pulse width modulation (PWM) rectifier, a kind of constant switching frequency method was proposed. The voltage of AC side of rectifier which would be effected in the next sampling period was obtained by solving cost function, then the voltage would be produced by using space vector pulse width modulation method to achieve constant switching frequency. Simulation and experimental results showed that the proposed control algorithm had constant switching frequency, low harmonic content and the rectifier operates with high power factor.
4 Sliding Mode Control for Permanent Magnet Synchronous Motor Based onVariableRate Reaching Law Method
2017, 44(5):22-26.
Abstract:
In order to improve the control performance of permanent magnet synchronous motor (PMSM) drive system, a siding mode speed control strategy based on an improved reaching law method was proposed. To shorten the reaching time and weaken system chattering of the conventional exponential reaching law, a novel reaching law based on traditional reaching law was proposed, and the method was applied to PMSM drive system. Compared with traditional PI controller, simulation and experiment results showed that the proposed controller improve the system robustness and dynamic performance.
In order to improve the control performance of permanent magnet synchronous motor (PMSM) drive system, a siding mode speed control strategy based on an improved reaching law method was proposed. To shorten the reaching time and weaken system chattering of the conventional exponential reaching law, a novel reaching law based on traditional reaching law was proposed, and the method was applied to PMSM drive system. Compared with traditional PI controller, simulation and experiment results showed that the proposed controller improve the system robustness and dynamic performance.
2017, 44(5):27-31.
Abstract:
To improve the performance of permanent magnet synchronous motor drive system, a speedsensorless deadbeat direct torque control (DBDTC) of interior permanent magnet synchronous motor (IPMSM) was presented. Based on the discrete model of the motor, the deadbeat voltage control law of the torque and flux linkage was derived. By employing a graphical analysis method, the physical meanings of the voltage vector solution were explained clearly. The speed sensorless control of IPMSM was realized by combining the DBDTC and the speed estimation method which based on the active flux observer. Simulation results verified the effectiveness of the proposed method.
To improve the performance of permanent magnet synchronous motor drive system, a speedsensorless deadbeat direct torque control (DBDTC) of interior permanent magnet synchronous motor (IPMSM) was presented. Based on the discrete model of the motor, the deadbeat voltage control law of the torque and flux linkage was derived. By employing a graphical analysis method, the physical meanings of the voltage vector solution were explained clearly. The speed sensorless control of IPMSM was realized by combining the DBDTC and the speed estimation method which based on the active flux observer. Simulation results verified the effectiveness of the proposed method.
2017, 44(5):32-37.
Abstract:
The brushless DC motor in electro hydraulic actuator (EHA) was required to start and brake frequently, having a relatively fast dynamic response. Onecycle control method was employed in EHA brushless DC motors due to the disadvantages of the common PID control method in nonlinear systems. The onecycle controller was used to control the torque output of motors in order to improve the capability of resisting disturbance and enhance dynamic performance. Common PI controller was employed to accomplish the control of system position and rotate speed, making system structure simple and easy to realize. Simulation results showed that, after introducing onecycle control method in current loop, the system had a better performance in stability and the fluctuation of the motor rotate speed and torque was smaller in steady state. An experiment was conducted on a platform including 28 kW angle power EHA and a digital controller based on “FPGA+DSP” structure, whose results verified that the EHA system based on the onecycle control method had a excellent performance both in steadystate and dynamics.
The brushless DC motor in electro hydraulic actuator (EHA) was required to start and brake frequently, having a relatively fast dynamic response. Onecycle control method was employed in EHA brushless DC motors due to the disadvantages of the common PID control method in nonlinear systems. The onecycle controller was used to control the torque output of motors in order to improve the capability of resisting disturbance and enhance dynamic performance. Common PI controller was employed to accomplish the control of system position and rotate speed, making system structure simple and easy to realize. Simulation results showed that, after introducing onecycle control method in current loop, the system had a better performance in stability and the fluctuation of the motor rotate speed and torque was smaller in steady state. An experiment was conducted on a platform including 28 kW angle power EHA and a digital controller based on “FPGA+DSP” structure, whose results verified that the EHA system based on the onecycle control method had a excellent performance both in steadystate and dynamics.
2017, 44(5):38-45.
Abstract:
Focused on the cascade control problems of the VIENNA highvoltage rectifier system, based on the principle of improving system efficiency and reduce the loss, proposed a dualloop cascadetype highvoltage rectifier circuit, established a dualloop controller, and presented a singlephase cascade VIENNA rectifier circuit coordinated control strategy. Simulation results verified the stability and the correctness of coordination control for dualloop cascade VIENNA high voltage rectifier circuit.
Focused on the cascade control problems of the VIENNA highvoltage rectifier system, based on the principle of improving system efficiency and reduce the loss, proposed a dualloop cascadetype highvoltage rectifier circuit, established a dualloop controller, and presented a singlephase cascade VIENNA rectifier circuit coordinated control strategy. Simulation results verified the stability and the correctness of coordination control for dualloop cascade VIENNA high voltage rectifier circuit.
2017, 44(5):46-51, 79.
Abstract:
The traditional AC network wind farm system has some problems, such as repeated electrical energy conversion, high cost. Aiming at it, A large capacity direct drive wind power unit cascaded DC grid system was designed. The network allowed series interconnection of wind turbines to distributed highvoltage DC (HVDC) power transmission without the AC transformer and the offshore platform. The direct drive permanent magnet power generator (PMSG) and the converter were used in the wind turbine. The converter including the AC/DC unit and the DC/DC unit, and the control strategy has been designed, that was allowed the current to flow at all times in the DC link while simultaneously regulating generator torque by adjusting the duty of the DC/DC unit. The working mode and the control strategy of the landbased thyristorbased inverter power plant had also been developed to realizing the voltage and current regulation of the HVDC link. At last, a complete 150 MW wind farm simulation based on PSCAD/EMTDC was built, and some calculations had been done. The simulation results indicated that the stable operation of the proposed configuration where each turbine was able to independently perform peak power tracking and the robustness and adaptability to the change of wind speed was also good at the same time.
The traditional AC network wind farm system has some problems, such as repeated electrical energy conversion, high cost. Aiming at it, A large capacity direct drive wind power unit cascaded DC grid system was designed. The network allowed series interconnection of wind turbines to distributed highvoltage DC (HVDC) power transmission without the AC transformer and the offshore platform. The direct drive permanent magnet power generator (PMSG) and the converter were used in the wind turbine. The converter including the AC/DC unit and the DC/DC unit, and the control strategy has been designed, that was allowed the current to flow at all times in the DC link while simultaneously regulating generator torque by adjusting the duty of the DC/DC unit. The working mode and the control strategy of the landbased thyristorbased inverter power plant had also been developed to realizing the voltage and current regulation of the HVDC link. At last, a complete 150 MW wind farm simulation based on PSCAD/EMTDC was built, and some calculations had been done. The simulation results indicated that the stable operation of the proposed configuration where each turbine was able to independently perform peak power tracking and the robustness and adaptability to the change of wind speed was also good at the same time.
2017, 44(5):52-55, 76.
Abstract:
When switched reluctance motor was in the status of slow running under direct torque control, calculation of flux was greatly influenced by resistance. In order to solve the issue above. The study observed and analyzed carefully about the relation between resistance and phase current, through comparing the output current between resistance variable motor model and actual motor model, proposed a solution of resistance estimation based on optimized BP neural networks. Optimized BP neural networks had sufficient mathematical theory, with simple structure and clear algorithm. The algorithm based on BP neural networks could recognize variable stator resistance. Put this algorithm into action in the Simulink control system, then comparing the test results between with resistance estimation and without resistance estimation. Experimental results showed that this resistance estimation method could improve system performance when the switched reluctance motor was in the status of slow running.
When switched reluctance motor was in the status of slow running under direct torque control, calculation of flux was greatly influenced by resistance. In order to solve the issue above. The study observed and analyzed carefully about the relation between resistance and phase current, through comparing the output current between resistance variable motor model and actual motor model, proposed a solution of resistance estimation based on optimized BP neural networks. Optimized BP neural networks had sufficient mathematical theory, with simple structure and clear algorithm. The algorithm based on BP neural networks could recognize variable stator resistance. Put this algorithm into action in the Simulink control system, then comparing the test results between with resistance estimation and without resistance estimation. Experimental results showed that this resistance estimation method could improve system performance when the switched reluctance motor was in the status of slow running.
2017, 44(5):56-62.
Abstract:
In order to solve microgrid ubiquitous threephase load imbalance, a detailed analysis of the microgrid threephase unbalanced load characteristics, a new method for the calculation of threephase load microgrid was proposed, and used an improved quantum genetic algorithm the model optimization solution. Quantum optimization algorithms used in the introduction of double chain structure and dynamics of the rotation angle adjustment strategy proposes a new improved quantum genetic algorithm, obtained the right solution and solve to obtain access to the best threephase load program. Finally, an example demonstrated the effectiveness and feasibility of the proposed model, strategies and algorithms.
In order to solve microgrid ubiquitous threephase load imbalance, a detailed analysis of the microgrid threephase unbalanced load characteristics, a new method for the calculation of threephase load microgrid was proposed, and used an improved quantum genetic algorithm the model optimization solution. Quantum optimization algorithms used in the introduction of double chain structure and dynamics of the rotation angle adjustment strategy proposes a new improved quantum genetic algorithm, obtained the right solution and solve to obtain access to the best threephase load program. Finally, an example demonstrated the effectiveness and feasibility of the proposed model, strategies and algorithms.
2017, 44(5):63-69.
Abstract:
Voltage drop was one of the most serious problems for the operation of the transmission and distribution networks. With the growing penetration level of distributed photovoltaic power sources, the latest domestic and international standards require that the PV inverter must have low voltage ride through capability. In order to eliminate the active power oscillations, an improved active/reactive current injection strategy was proposed on the basis of the conventional positive/negative sequence control. As the current voltage support schemes fail to limit voltage lifting range, a complete control scheme intended to regard three phase voltage amplitudes as the control target to regulate the maximum and minimum phase voltages at the point of common coupling within the limits established in grid codes for continuous operation. A mathematical model adapted to different types of voltage dips was derived in detail and reactive power reference was also calculated after that. Finally, the results of simulation confirmed the correctness and effectiveness of the proposed strategy.
Voltage drop was one of the most serious problems for the operation of the transmission and distribution networks. With the growing penetration level of distributed photovoltaic power sources, the latest domestic and international standards require that the PV inverter must have low voltage ride through capability. In order to eliminate the active power oscillations, an improved active/reactive current injection strategy was proposed on the basis of the conventional positive/negative sequence control. As the current voltage support schemes fail to limit voltage lifting range, a complete control scheme intended to regard three phase voltage amplitudes as the control target to regulate the maximum and minimum phase voltages at the point of common coupling within the limits established in grid codes for continuous operation. A mathematical model adapted to different types of voltage dips was derived in detail and reactive power reference was also calculated after that. Finally, the results of simulation confirmed the correctness and effectiveness of the proposed strategy.
2017, 44(5):70-76.
Abstract:
A switched flux hybrid magnet memory motor was designed. The simulation model was established in Ansoft Maxwell 2D software. The operation principle of the motor was analyzed. The flux adjusting of the motor was researched by using the finite element analysis method. The motor′s flux_lines, fluxlinkage of winding A, reverse electromotive force curves, magnetic flux density curves and torque waveform curves under different magnetizing state of AlNiCo PMs were given. The simulation results showed that compared with the traditional permanent magnet synchronous moto, the motor had good flux adjusting ability.
A switched flux hybrid magnet memory motor was designed. The simulation model was established in Ansoft Maxwell 2D software. The operation principle of the motor was analyzed. The flux adjusting of the motor was researched by using the finite element analysis method. The motor′s flux_lines, fluxlinkage of winding A, reverse electromotive force curves, magnetic flux density curves and torque waveform curves under different magnetizing state of AlNiCo PMs were given. The simulation results showed that compared with the traditional permanent magnet synchronous moto, the motor had good flux adjusting ability.
2017, 44(5):77-79.
Abstract:
The process of rotor enclose slots of high efficiency motor could reduce loss of rotor cogging and increase efficiency. The results could be validated against prototype test data. Also correspond technology measure was proposed.
The process of rotor enclose slots of high efficiency motor could reduce loss of rotor cogging and increase efficiency. The results could be validated against prototype test data. Also correspond technology measure was proposed.
2017, 44(5):80-83.
Abstract:
In order to suppress the torque ripple in the switched reluctance motor, a new stator pole shape was proposed. It changed the traditional uniform air gap into nonuniform air gap of two sections. An 11 kW, 1 000 r/min, 12/8 SRM as the prototype, the structure was validated and optimized through establishing the twodimensional fieldcircuit coupled timestepping finite element model. The results showed that the structure could reduce the torque ripple effectively with ensuring the efficiency of the motor unchanged. A useful reference to promote the level of design and operation of switched reluctance motor was provided.
In order to suppress the torque ripple in the switched reluctance motor, a new stator pole shape was proposed. It changed the traditional uniform air gap into nonuniform air gap of two sections. An 11 kW, 1 000 r/min, 12/8 SRM as the prototype, the structure was validated and optimized through establishing the twodimensional fieldcircuit coupled timestepping finite element model. The results showed that the structure could reduce the torque ripple effectively with ensuring the efficiency of the motor unchanged. A useful reference to promote the level of design and operation of switched reluctance motor was provided.
2017, 44(5):84-89, 120.
Abstract:
A reliable and reasonably accurate loss model of variable speed motor systems is important for its performance prediction and energy consumption analysis. Most of the existing methods are based on the finite element analysis, but the disadvantage lies in the computational difficulty, which is not suitable for practical application. A practical simulation model of variable speed motor systems based on MATLAB/Simulink was estabcished. The converter losses were calculated by analytical model of IGBT and Diode, and the iron lossed in variablefrequency motor was considered as variable iron loss equivalent resistance. The efficiency of the motor system under different conditions was analyzed, and it showed that traditional models of motor systems may cause errors when determining the optimal system operating point, with the converter losses neglected. The experimental validation was also performed on a 5.5 kW motor. The achievement coucd provide technique support for the optimal control strategy for motor systems.
A reliable and reasonably accurate loss model of variable speed motor systems is important for its performance prediction and energy consumption analysis. Most of the existing methods are based on the finite element analysis, but the disadvantage lies in the computational difficulty, which is not suitable for practical application. A practical simulation model of variable speed motor systems based on MATLAB/Simulink was estabcished. The converter losses were calculated by analytical model of IGBT and Diode, and the iron lossed in variablefrequency motor was considered as variable iron loss equivalent resistance. The efficiency of the motor system under different conditions was analyzed, and it showed that traditional models of motor systems may cause errors when determining the optimal system operating point, with the converter losses neglected. The experimental validation was also performed on a 5.5 kW motor. The achievement coucd provide technique support for the optimal control strategy for motor systems.
2017, 44(5):90-97.
Abstract:
The capacity of the direct driven permanent magnet wind turbine was usually reached megawatt, and the parallel structure was the main solution for expansion. The generator side of the traditional wind power converter was always has an independent DC bus. Although it had the advantages of a simple controller, but the cost would higher and the volume would increase. Aiming at it, a new control schema of parallel rectifiers for a direct drive permanent magnet wind power generator had been proposed. The purpose of the controller was to suppress circulation current caused by asynchronization between the paralleled rectifiers. Therefore, the loop circulation current between the multiple rectifiers had been analyzed, and the dynamic of zero sequence current had been modeled at first. Then, the independent current controllers havd been designed, and it generated the pulse modulation signal to the rectifiers through the synchronous carrier phase shift generator. Each controller used the same rotor position observer, so as to realize the current of each module synchronization and equalization, and the total generator torque optimal matching. In order to verify the performances of the proposed controller, the platform based on 1.5MW wind power system was built, and some experiments had been done. The results showed that the rectifier modules of the converter operators well with the new controller, and the performances of the controller were good.
The capacity of the direct driven permanent magnet wind turbine was usually reached megawatt, and the parallel structure was the main solution for expansion. The generator side of the traditional wind power converter was always has an independent DC bus. Although it had the advantages of a simple controller, but the cost would higher and the volume would increase. Aiming at it, a new control schema of parallel rectifiers for a direct drive permanent magnet wind power generator had been proposed. The purpose of the controller was to suppress circulation current caused by asynchronization between the paralleled rectifiers. Therefore, the loop circulation current between the multiple rectifiers had been analyzed, and the dynamic of zero sequence current had been modeled at first. Then, the independent current controllers havd been designed, and it generated the pulse modulation signal to the rectifiers through the synchronous carrier phase shift generator. Each controller used the same rotor position observer, so as to realize the current of each module synchronization and equalization, and the total generator torque optimal matching. In order to verify the performances of the proposed controller, the platform based on 1.5MW wind power system was built, and some experiments had been done. The results showed that the rectifier modules of the converter operators well with the new controller, and the performances of the controller were good.
17 Computed Current Control Method for Maximum Power PointTracking of GridConnected Photovoltaic System
2017, 44(5):98-101, 127.
Abstract:
A new maximum power point tracking (MPPT) topology for a gridconnected PV system considering the sudden changes in environmeons was proposed. Considering the nonlinear characteristics of photovoltaic array according to actual condition, maximum power point of PV voltage oscillation around as well as the design of the inverter and filter and so on. In order to ensure the stability of the system adopts the control algorithm, the design of the maximum power point tracking arised at the historic moment, through the improved algorithm from photovoltaic system reference current and voltage and current predictive control photovoltaic (PV) gridconnected system. Based on compared with the ripple correlation control (RCC) method of the traditional and the simulation results were given. The simulation results showed that: Compared with the ripple correlation control (RCC) method when the solar radiation generate the sudden changes, the proposed improved algorithm of tracking speed increased 9.3%, the new algorithm not only could accurately track the maximum power point of photovoltaic (PV) gridconnected system, but also had the stable and reliable performance.
A new maximum power point tracking (MPPT) topology for a gridconnected PV system considering the sudden changes in environmeons was proposed. Considering the nonlinear characteristics of photovoltaic array according to actual condition, maximum power point of PV voltage oscillation around as well as the design of the inverter and filter and so on. In order to ensure the stability of the system adopts the control algorithm, the design of the maximum power point tracking arised at the historic moment, through the improved algorithm from photovoltaic system reference current and voltage and current predictive control photovoltaic (PV) gridconnected system. Based on compared with the ripple correlation control (RCC) method of the traditional and the simulation results were given. The simulation results showed that: Compared with the ripple correlation control (RCC) method when the solar radiation generate the sudden changes, the proposed improved algorithm of tracking speed increased 9.3%, the new algorithm not only could accurately track the maximum power point of photovoltaic (PV) gridconnected system, but also had the stable and reliable performance.
2017, 44(5):102-107.
Abstract:
The control of doubly fed induction generator (DFIG) was complicated. Offline simulation and traditional fullsubstantial fault experiments had their limitations. A semisubstantial realtime platform of doubly fed wind generation based on dSPACE1007 was constructed in the environment of powerful MATLAB/Simulink. Data interface and control of debugging motors with winding faults, dSPACE and Simulink software together were solved. The experimental results indicated that the platform funtion well in the working condition of stator or rotor winding interrnal faults through changing control parameters and algorithms by control Desk, which provided hardware platforms for fault detective and fault tolerance of DFIG.
The control of doubly fed induction generator (DFIG) was complicated. Offline simulation and traditional fullsubstantial fault experiments had their limitations. A semisubstantial realtime platform of doubly fed wind generation based on dSPACE1007 was constructed in the environment of powerful MATLAB/Simulink. Data interface and control of debugging motors with winding faults, dSPACE and Simulink software together were solved. The experimental results indicated that the platform funtion well in the working condition of stator or rotor winding interrnal faults through changing control parameters and algorithms by control Desk, which provided hardware platforms for fault detective and fault tolerance of DFIG.
2017, 44(5):108-115, 127.
Abstract:
In order to study the effect of high voltage ride through (HVRT) of doubly-fed wind power system under sator winding interturn short circuit (SWITSC) faulty condition, based on the multi loop theory, a simulation mode of doubly fed induction generator under SWITSC faulty condition was established, the S-function in the MATLAB/Simulink was established. On the basis of fault loop characteristics, mathematical model of DFIG wind turbine on ABC coordinate system and dq0coordinate system were established under normal and fault condition, and the electromagnetic characteristics was analyzed briefly under SWITSC fault, then the capability of high voltage ride through of DFIG was analyzed, the reason and the transient process of wind farm voltage rise were analyzed. The standard of high voltage ride through was provided. Focused on the simulation results of HVRT of DFIG under SWITSC faulty condition, the explanation was given. The results showed that SWITSC faulty destroyed capability of HVRT of DFIG to a great extent.
In order to study the effect of high voltage ride through (HVRT) of doubly-fed wind power system under sator winding interturn short circuit (SWITSC) faulty condition, based on the multi loop theory, a simulation mode of doubly fed induction generator under SWITSC faulty condition was established, the S-function in the MATLAB/Simulink was established. On the basis of fault loop characteristics, mathematical model of DFIG wind turbine on ABC coordinate system and dq0coordinate system were established under normal and fault condition, and the electromagnetic characteristics was analyzed briefly under SWITSC fault, then the capability of high voltage ride through of DFIG was analyzed, the reason and the transient process of wind farm voltage rise were analyzed. The standard of high voltage ride through was provided. Focused on the simulation results of HVRT of DFIG under SWITSC faulty condition, the explanation was given. The results showed that SWITSC faulty destroyed capability of HVRT of DFIG to a great extent.
2017, 44(5):116-120.
Abstract:
Motor vibration was an important performance indicators and motor vibration analysis could improve its structure and provide a theoretical basis for performance optimization. In order to understand the vibration characteristics of the motor, the first six order natural frequencies and corresponding vibration modes of the motor rotor vibration system were obtained, with the modal analysis of the rotor of the permanent magnet synchronous motor carried on by the Ansys finite element analysis software. The accuracy of the Ansys finite element analysis was verified by the hammering method of modal experiment. The result of analysis showed that the motor dod not appear resonance phenomenon, so the design of the motor rotor was reasonable. This research content has certain guiding significance for the design and optimization of permanent magnet synchronous motor.
Motor vibration was an important performance indicators and motor vibration analysis could improve its structure and provide a theoretical basis for performance optimization. In order to understand the vibration characteristics of the motor, the first six order natural frequencies and corresponding vibration modes of the motor rotor vibration system were obtained, with the modal analysis of the rotor of the permanent magnet synchronous motor carried on by the Ansys finite element analysis software. The accuracy of the Ansys finite element analysis was verified by the hammering method of modal experiment. The result of analysis showed that the motor dod not appear resonance phenomenon, so the design of the motor rotor was reasonable. This research content has certain guiding significance for the design and optimization of permanent magnet synchronous motor.
2017, 44(5):121-129.
Abstract:
In some industrial applications, the brushless DC motor needs to maintain its operating condition in the case of the rotor eccentricity, and the traditional control strategy was difficult to achieve fault tolerance with it. Aiming at this problem, a fault tolerant control strategy for the brushless DC motor with rotor eccentricity was presented. First of all, in the conventional brushless DC motor control method, stator current commands were similar in shape and delayed by corresponding phase differences in each phase, without considering the change of the back electromotive force and the c phase inductance caused by the rotor eccentricity, so the unknown torque ripples would happen. Therefore, a novel control strategy based on traditional control strategy based on the online estimation of the phase inductance and back electromotive force value, thereby setting the stator current reference controller consists of eccentric fault. Then the motor could reduce the torque pulsation, and had the fault tolerant ability. The contrast experiments had been taken to verify that the proposed method at the last.
In some industrial applications, the brushless DC motor needs to maintain its operating condition in the case of the rotor eccentricity, and the traditional control strategy was difficult to achieve fault tolerance with it. Aiming at this problem, a fault tolerant control strategy for the brushless DC motor with rotor eccentricity was presented. First of all, in the conventional brushless DC motor control method, stator current commands were similar in shape and delayed by corresponding phase differences in each phase, without considering the change of the back electromotive force and the c phase inductance caused by the rotor eccentricity, so the unknown torque ripples would happen. Therefore, a novel control strategy based on traditional control strategy based on the online estimation of the phase inductance and back electromotive force value, thereby setting the stator current reference controller consists of eccentric fault. Then the motor could reduce the torque pulsation, and had the fault tolerant ability. The contrast experiments had been taken to verify that the proposed method at the last.
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Electric Machines & Control Application ® 2025
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沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
