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Volume 45,Issue 4,2018 Table of Contents
2018, 45(4):1-7, 43.
Abstract:
In order to improved the speed control performance of the tractor motor and system’s antidisturbance as well as the robustness to the parameter change, the PI control strategy of the control system was replaced by the integral sliding mode control strategy. Aiming at load changes in the running process of the electric locomotive, the load torque observer was designed to observe the load torque in realtime, the observed value was integrated into the control strategy and improved the speed of the load mutation control. It could also improve the dynamic and static characteristics of traction motor. Simulation experiments showed that the load observer could quickly and accurately follow the load changes. The sliding mode speed controller with load observation kept the locomotive speed stable when the working conditions were complex, and the dynamic and static performances of the locomotive and the antijamming performance were improved.
In order to improved the speed control performance of the tractor motor and system’s antidisturbance as well as the robustness to the parameter change, the PI control strategy of the control system was replaced by the integral sliding mode control strategy. Aiming at load changes in the running process of the electric locomotive, the load torque observer was designed to observe the load torque in realtime, the observed value was integrated into the control strategy and improved the speed of the load mutation control. It could also improve the dynamic and static characteristics of traction motor. Simulation experiments showed that the load observer could quickly and accurately follow the load changes. The sliding mode speed controller with load observation kept the locomotive speed stable when the working conditions were complex, and the dynamic and static performances of the locomotive and the antijamming performance were improved.
2018, 45(4):8-14.
Abstract:
An improved sensorless control algorithm for faulttolerant control was proposed for the dual winding FTPMM. The sensorless control algorithm, based on the back EMF method, utilized the flux linkage generated by each phase winding and the back electromotive force to estimate the position of rotor. The phaselocked loop technology was used to compensate for errors. The parameters used in this method were identified online, and the identification results were updated to the rotor position estimation algorithm. The rotor position and speed measurement could be achieved through the method in the case of doublewinding permanent magnet faulttolerant motor operating normally, singlephase fault or multi phase faults. The experiment was carried out by MATLAB/Simulink to verifiy the accuracy of the rotor position estimation method.
An improved sensorless control algorithm for faulttolerant control was proposed for the dual winding FTPMM. The sensorless control algorithm, based on the back EMF method, utilized the flux linkage generated by each phase winding and the back electromotive force to estimate the position of rotor. The phaselocked loop technology was used to compensate for errors. The parameters used in this method were identified online, and the identification results were updated to the rotor position estimation algorithm. The rotor position and speed measurement could be achieved through the method in the case of doublewinding permanent magnet faulttolerant motor operating normally, singlephase fault or multi phase faults. The experiment was carried out by MATLAB/Simulink to verifiy the accuracy of the rotor position estimation method.
2018, 45(4):15-21.
Abstract:
Several traditional dualmotor inverter topologies were analyzed. Aiming at the existing problems, an improved inverter topology was analyzed, which made up the problem. The traditional inverter topology control was complex and it was difficult to control the two motors independently. The simulation model of permanent magnet synchronous motor vector control in MATLAB/Simulink environment was established. The simulation results showed that with the improved inverter topology two motors could be controlled independently and the control was simple.
Several traditional dualmotor inverter topologies were analyzed. Aiming at the existing problems, an improved inverter topology was analyzed, which made up the problem. The traditional inverter topology control was complex and it was difficult to control the two motors independently. The simulation model of permanent magnet synchronous motor vector control in MATLAB/Simulink environment was established. The simulation results showed that with the improved inverter topology two motors could be controlled independently and the control was simple.
2018, 45(4):22-26.
Abstract:
Position dynamic fast response speed and without overshoot were two important indicators of the current highperformance position servo system, but proportional or proportional differential regulator could not meet both requirements at the same time, therefore a new positioning compound control strategy was proposed. First set the speed command with cosine function curve to ensure smooth movement without impact, than optimize the command position trajectory according to the speed command for avoid the impact of acceleration mutation. In the system control structure, the position pseudo derivative feedback control was proposed on the basis of feedforward control, this structure increases the system damping for reduces the position overshoot, and combined with feedforward control to ensure fast tracking performance simultaneously. the noise generated by derivative was avoid because of position differential operation was instead of pseudo derivative structure, and the range of the structural parameters was given. The results of simulation and experimental verified the feasibility and effectiveness of the control strategy.
Position dynamic fast response speed and without overshoot were two important indicators of the current highperformance position servo system, but proportional or proportional differential regulator could not meet both requirements at the same time, therefore a new positioning compound control strategy was proposed. First set the speed command with cosine function curve to ensure smooth movement without impact, than optimize the command position trajectory according to the speed command for avoid the impact of acceleration mutation. In the system control structure, the position pseudo derivative feedback control was proposed on the basis of feedforward control, this structure increases the system damping for reduces the position overshoot, and combined with feedforward control to ensure fast tracking performance simultaneously. the noise generated by derivative was avoid because of position differential operation was instead of pseudo derivative structure, and the range of the structural parameters was given. The results of simulation and experimental verified the feasibility and effectiveness of the control strategy.
2018, 45(4):27-32.
Abstract:
The actual operating conditions of electric vehicles were complicated, and the speed range and torque requirements of PMSM were higher. In order to improve the speed range of the builtin permanent magnet synchronous motor, the voltage closedloop feedback field weakening control method was studied and realized. The method used the voltage utilization as a reference to construct the voltage loop, and the weak feedback was calculated by the voltage feedback signal and the command signal. Current idreference value, thus realizing the permanent magnet synchronous motor weak flux expansion. The simulation model of the field weakening control system of the builtin permanent magnet synchronous motor was established on the MATLAB/Simulink platform. The simulation results showed that the system had a wide speed range and the interval was smooth and had good response characteristics.
The actual operating conditions of electric vehicles were complicated, and the speed range and torque requirements of PMSM were higher. In order to improve the speed range of the builtin permanent magnet synchronous motor, the voltage closedloop feedback field weakening control method was studied and realized. The method used the voltage utilization as a reference to construct the voltage loop, and the weak feedback was calculated by the voltage feedback signal and the command signal. Current idreference value, thus realizing the permanent magnet synchronous motor weak flux expansion. The simulation model of the field weakening control system of the builtin permanent magnet synchronous motor was established on the MATLAB/Simulink platform. The simulation results showed that the system had a wide speed range and the interval was smooth and had good response characteristics.
2018, 45(4):33-38.
Abstract:
In view of the output characteristics of photovoltaic power generation system, it was vulnerable to the influence of external variables and presents asymmetric strong nonlinearity, and the output power often deviates from the maximum output power point. Here we discuss the advantages and disadvantages of several commonly used maximum power point tracking control method, the PUcurve was analyzed, and puts forward the method of asymmetric fuzzy and variable step incremental conductance method combining the variable step incremental conductance method here can be far away from the maximum power point on both sides, fast approaching the maximum power point. When further near the maximum power point near the interval, at this time, the asymmetric fuzzy control optimization, could effectively eliminate the oscillation phenomenon in the vicinity of the maximum power point, improve the stability of the system. The simulation results in MATLAB/Simulink showed that the proposed method had better dynamic performance.
In view of the output characteristics of photovoltaic power generation system, it was vulnerable to the influence of external variables and presents asymmetric strong nonlinearity, and the output power often deviates from the maximum output power point. Here we discuss the advantages and disadvantages of several commonly used maximum power point tracking control method, the PUcurve was analyzed, and puts forward the method of asymmetric fuzzy and variable step incremental conductance method combining the variable step incremental conductance method here can be far away from the maximum power point on both sides, fast approaching the maximum power point. When further near the maximum power point near the interval, at this time, the asymmetric fuzzy control optimization, could effectively eliminate the oscillation phenomenon in the vicinity of the maximum power point, improve the stability of the system. The simulation results in MATLAB/Simulink showed that the proposed method had better dynamic performance.
2018, 45(4):39-43.
Abstract:
Used parameters adaptive PID algorithm on the current loop of the asynchronous motor vector control. This algorithm adopts the recursive least square method with forgetting factor to estimate the PID parameters online. Can realtime adjust PID parameters according to different situations. The experimental results showed that this algorithm was good robustness, stability, strong adaptability, small amount of calculation and could meet the requirement of current control, and improve the antiinterference ability of the speed.
Used parameters adaptive PID algorithm on the current loop of the asynchronous motor vector control. This algorithm adopts the recursive least square method with forgetting factor to estimate the PID parameters online. Can realtime adjust PID parameters according to different situations. The experimental results showed that this algorithm was good robustness, stability, strong adaptability, small amount of calculation and could meet the requirement of current control, and improve the antiinterference ability of the speed.
2018, 45(4):44-49, 55.
Abstract:
In view of the vector control of motor parameter dependent problems, based on the relevant theory of the existing mathematical model of permanent magnet synchronous motor and direct torque control, synchronous reluctance motor mathematical analysis, the direct torque control method of synchronous reluctance motor was proposed. It includes the calculation of space voltage vector, hysteresis control of flux linkage and torque, etc. based on the estimation of position information, a PI controller with integral separation was introduced, and a closed-loop controller of speed was designed. The simulation model of the system was built, and the steadystate and dynamic performances of the motor were simulated and analyzed. The result showed that the system designed based on this method could change speed at a wide speed range.
In view of the vector control of motor parameter dependent problems, based on the relevant theory of the existing mathematical model of permanent magnet synchronous motor and direct torque control, synchronous reluctance motor mathematical analysis, the direct torque control method of synchronous reluctance motor was proposed. It includes the calculation of space voltage vector, hysteresis control of flux linkage and torque, etc. based on the estimation of position information, a PI controller with integral separation was introduced, and a closed-loop controller of speed was designed. The simulation model of the system was built, and the steadystate and dynamic performances of the motor were simulated and analyzed. The result showed that the system designed based on this method could change speed at a wide speed range.
9 Speed Sensorless Control of the Spindle Motor SVMDTC System ofHighSpeed Precision Roll Grinding Head
2018, 45(4):50-55.
Abstract:
Based on the mathematical model of the spindle motor YVF160L2 and the inverter, the space voltage vector modulation (SVM) and the direct torque control (DTC) were used for the highspeed precision roll grinder which grinding speed in more than 80 m/s. (SVMDTC), reducing the torque ripple during the operation of the spindle grinding wheel spindle; and using the model reference sensor to establish the speed observer to realize high speed precision roll grinding head spindle motor without speed sensing Closedloop control. The simulation results showed that the SVMDTC system based on the observation speed could effectively improve the fluctuation of the stator flux and output shaft torque during the operation of the spindle motor, and the control performance was improved obviously.
Based on the mathematical model of the spindle motor YVF160L2 and the inverter, the space voltage vector modulation (SVM) and the direct torque control (DTC) were used for the highspeed precision roll grinder which grinding speed in more than 80 m/s. (SVMDTC), reducing the torque ripple during the operation of the spindle grinding wheel spindle; and using the model reference sensor to establish the speed observer to realize high speed precision roll grinding head spindle motor without speed sensing Closedloop control. The simulation results showed that the SVMDTC system based on the observation speed could effectively improve the fluctuation of the stator flux and output shaft torque during the operation of the spindle motor, and the control performance was improved obviously.
2018, 45(4):56-60.
Abstract:
According to load characteristics of the port crane, through the analysis of lifting control principle and the state equation of the motor, the motor drag test system had been established base on PLC and inverter, the simulation and experimental analysis of the model were carried out by the control strategy of the transfer frequency control. It was verified that the VVVF control system had large energy saving space, especially for full load and heavy load control, which provides a theoretical and experimental basis for the energy saving of port cranes.
According to load characteristics of the port crane, through the analysis of lifting control principle and the state equation of the motor, the motor drag test system had been established base on PLC and inverter, the simulation and experimental analysis of the model were carried out by the control strategy of the transfer frequency control. It was verified that the VVVF control system had large energy saving space, especially for full load and heavy load control, which provides a theoretical and experimental basis for the energy saving of port cranes.
2018, 45(4):61-66, 89.
Abstract:
Aiming at problems that the critical techniques and vehicle spare parts completely dependent on import in domestic rail transit of linear induction motor (LIM) traction drive, as well as the difficulties of repair maintenance, and the high costs of vehicle operation, a highpower, forced aircooled LIM traction converter system was researched and developed with completely independent intellectual property rights. Against the end effect and other problems caused by the special structure of LIM, an optimal scheme of indirect fieldoriented vector control was proposed. And the change of LIM secondary time constant had a great influence on the fieldoriented control, which results in torque performance degradation. Therefore an online parameter identification method based on the minimum current was presented. It had advantages of simple calculation and not relying on other motor parameters. Experiment results of test bench demonstrate the accuracy and validity. The experiments results in an actual operation subway line showed that the performance of localization traction converter fully meets the vehicle technical requirements. And some indicators such as efficiency were even better than the imported one.
Aiming at problems that the critical techniques and vehicle spare parts completely dependent on import in domestic rail transit of linear induction motor (LIM) traction drive, as well as the difficulties of repair maintenance, and the high costs of vehicle operation, a highpower, forced aircooled LIM traction converter system was researched and developed with completely independent intellectual property rights. Against the end effect and other problems caused by the special structure of LIM, an optimal scheme of indirect fieldoriented vector control was proposed. And the change of LIM secondary time constant had a great influence on the fieldoriented control, which results in torque performance degradation. Therefore an online parameter identification method based on the minimum current was presented. It had advantages of simple calculation and not relying on other motor parameters. Experiment results of test bench demonstrate the accuracy and validity. The experiments results in an actual operation subway line showed that the performance of localization traction converter fully meets the vehicle technical requirements. And some indicators such as efficiency were even better than the imported one.
2018, 45(4):67-72.
Abstract:
Photovoltaic water pump system was a kind of environmental and sustainable new energy water pump system. Because the output power of PV array was unstable and discontinuous, it was hard to realize the 24hour continuous and efficient running. So a PVgrid water pump system was put forward. When the output power of PV array was insufficient, the grid compensates for the power shortage automatically through the power compensation controller. For the characteristics of the existing system was singlestage circuit, the limitation of the existing power compensation controller scheme was analyzed. And a new design was proposed, in which the threephase grid was directly connected to the DC bus after rectifier circuit. According to the design, the corresponding simulation model was built in the MATLAB/Simulink to verified the design. Then the function and efficiency of the power compensation controller were tested in experiment. The results of the experiments verified the feasibility of the design.
Photovoltaic water pump system was a kind of environmental and sustainable new energy water pump system. Because the output power of PV array was unstable and discontinuous, it was hard to realize the 24hour continuous and efficient running. So a PVgrid water pump system was put forward. When the output power of PV array was insufficient, the grid compensates for the power shortage automatically through the power compensation controller. For the characteristics of the existing system was singlestage circuit, the limitation of the existing power compensation controller scheme was analyzed. And a new design was proposed, in which the threephase grid was directly connected to the DC bus after rectifier circuit. According to the design, the corresponding simulation model was built in the MATLAB/Simulink to verified the design. Then the function and efficiency of the power compensation controller were tested in experiment. The results of the experiments verified the feasibility of the design.
2018, 45(4):73-79, 84.
Abstract:
In order to improve the efficiency of permanent magnet synchronous motor (PMSM) with halleffect sensor, it was necessary to solve the difficulty of halleffect sensor calibration. Two selfcalibration algorithms were proposed. In order to verify the accuracy of the two selfcalibration algorithms, simulation and algorithmic programming verification of the proposed algorithm were presented. After calibrated by algorithms, the rotor position of the halleffect sensor was compared with that measured by the resolver. The results showed that the selfcalibration algorithms of halleffect sensor could improve the calibration efficiency and improve the accuracy of the rotor position, and provide the guarantee for accurate and efficient control of the PMSM.
In order to improve the efficiency of permanent magnet synchronous motor (PMSM) with halleffect sensor, it was necessary to solve the difficulty of halleffect sensor calibration. Two selfcalibration algorithms were proposed. In order to verify the accuracy of the two selfcalibration algorithms, simulation and algorithmic programming verification of the proposed algorithm were presented. After calibrated by algorithms, the rotor position of the halleffect sensor was compared with that measured by the resolver. The results showed that the selfcalibration algorithms of halleffect sensor could improve the calibration efficiency and improve the accuracy of the rotor position, and provide the guarantee for accurate and efficient control of the PMSM.
2018, 45(4):80-84.
Abstract:
The bearing life analysis under the random multiaxial loading was the very complex, the key was to get the exact stress distribution. Therefore, the stress analysis was carried out for the main shaft bearing of an aviation motor. Firstly, based on the characteristic of air motor axis bearing, the Von Mises stress distribution model of the random multiaxial loading was built up under the axial, sailing and vertical direction power spectrum density. Secondly, the modal with prestress analysis and random vibration analysis were carried out through Ansys Workbench. Finally, the mean value of the stress was compared. The correctness stress analysis method was validated, which lays the basis for the bearing fatigue life analysis.
The bearing life analysis under the random multiaxial loading was the very complex, the key was to get the exact stress distribution. Therefore, the stress analysis was carried out for the main shaft bearing of an aviation motor. Firstly, based on the characteristic of air motor axis bearing, the Von Mises stress distribution model of the random multiaxial loading was built up under the axial, sailing and vertical direction power spectrum density. Secondly, the modal with prestress analysis and random vibration analysis were carried out through Ansys Workbench. Finally, the mean value of the stress was compared. The correctness stress analysis method was validated, which lays the basis for the bearing fatigue life analysis.
2018, 45(4):85-89.
Abstract:
Aiming at the vibration and noise of motor stator system, the ANSYS finite element simulation software was used to simulate the threedimensional model of the motor stator system. The natural frequency and vibration shape of the stator system were obtained. And the simulation results were verified by experiments. At the same time, the electromagnetic simulation of the motor was carried out, and the air gap flux density and the harmonic frequency of electromagnetic force harmonic were obtained. The frequency of electric magnetic harmonic frequency was compared with the natural frequency of the motor to determine that the electromagnetic force harmonic does not cause the resonance of the motor stator system. The rationality of the motor structure was verified. A certain reference value for the design optimization of the same kind of products was provided.
Aiming at the vibration and noise of motor stator system, the ANSYS finite element simulation software was used to simulate the threedimensional model of the motor stator system. The natural frequency and vibration shape of the stator system were obtained. And the simulation results were verified by experiments. At the same time, the electromagnetic simulation of the motor was carried out, and the air gap flux density and the harmonic frequency of electromagnetic force harmonic were obtained. The frequency of electric magnetic harmonic frequency was compared with the natural frequency of the motor to determine that the electromagnetic force harmonic does not cause the resonance of the motor stator system. The rationality of the motor structure was verified. A certain reference value for the design optimization of the same kind of products was provided.
2018, 45(4):90-93.
Abstract:
Sudden loss of power, the motor in the accident in order to ensure the system safety, motor could drag equipment rely on their own inertia, continue to run 2 minutes. Due to inertia was far less than the system inertia motor itself demand, so need to be on the machine body with large diameter, large flywheel weight, in order to provide enough moment of inertia. In large capacity and high speed vertical motor equipped with big moment of inertia of the flywheel, the stable operation of the motor becomes very important, therefore, shafting on stiffness of the machine itself and the rationality of the structure design should be validated. Aiming at the key points of the motor structure design and calculation, and through the real machine field operation. Verified the reliability of the motor. To provide the reference for electrical engineering application.
Sudden loss of power, the motor in the accident in order to ensure the system safety, motor could drag equipment rely on their own inertia, continue to run 2 minutes. Due to inertia was far less than the system inertia motor itself demand, so need to be on the machine body with large diameter, large flywheel weight, in order to provide enough moment of inertia. In large capacity and high speed vertical motor equipped with big moment of inertia of the flywheel, the stable operation of the motor becomes very important, therefore, shafting on stiffness of the machine itself and the rationality of the structure design should be validated. Aiming at the key points of the motor structure design and calculation, and through the real machine field operation. Verified the reliability of the motor. To provide the reference for electrical engineering application.
2018, 45(4):94-97, 104.
Abstract:
The fastening bolts of the locomotive traction motor terminal box coverplate had happened fracture in the running, the fracture failure reason was analyzed. The improved solutions were proposed. After improvement, the fault was solved, the application effect was very significant.
The fastening bolts of the locomotive traction motor terminal box coverplate had happened fracture in the running, the fracture failure reason was analyzed. The improved solutions were proposed. After improvement, the fault was solved, the application effect was very significant.
2018, 45(4):98-104.
Abstract:
The embedded coils and kernel principal component analysis (KPCA) together were proposed to detect the bearing faults. 8 detection coils were firstly embedded into the front and rear ends of the motor stator, respectively; and they form 6 groups of differential signals by timesharing multiplexing. The differential signals reflect the operation status of the motor; however, the relationship between the differential signals and motor status was nonlinear. Thus, we employ KPCA to deal with the problem of nonlinearity. The algorithm, detection statistics and steps of KPCA were investigated. Finally, an oil pump was used to carry out the experimental studies. The experiment results were presented to prove the validity and correctness of the proposed fault detection method.
The embedded coils and kernel principal component analysis (KPCA) together were proposed to detect the bearing faults. 8 detection coils were firstly embedded into the front and rear ends of the motor stator, respectively; and they form 6 groups of differential signals by timesharing multiplexing. The differential signals reflect the operation status of the motor; however, the relationship between the differential signals and motor status was nonlinear. Thus, we employ KPCA to deal with the problem of nonlinearity. The algorithm, detection statistics and steps of KPCA were investigated. Finally, an oil pump was used to carry out the experimental studies. The experiment results were presented to prove the validity and correctness of the proposed fault detection method.
2018, 45(4):105-109.
Abstract:
The permanent magnet motor for bus was introduced, V type and V type of two kinds of different rotor structure motor torque, straight axis inductance and the flux weakening capability and iron loss properties were analyzed by the finite element method, the simulation of efficiency map of different rotor structures. By comparing and analyzing the characteristics of different rotor structure, the rotor magnetic circuit structure suitable for electric bus driving was selected.
The permanent magnet motor for bus was introduced, V type and V type of two kinds of different rotor structure motor torque, straight axis inductance and the flux weakening capability and iron loss properties were analyzed by the finite element method, the simulation of efficiency map of different rotor structures. By comparing and analyzing the characteristics of different rotor structure, the rotor magnetic circuit structure suitable for electric bus driving was selected.
2018, 45(4):110-115, 121.
Abstract:
Based on Ansys multiphysics simulation platform, a multiphysics coupling analysis of a vehicle asynchronous motor was carried out. The temperature rise and thermal stress of the motor under the rated working conditions and the peak operating conditions were simulated, and the temperature field distribution of each part of the motor was analyzed deeply, and the maximum allowable time of the motor peak condition was predicted. The thermal stress distribution of the internal structure of the rotor was analyzed by finite element simulation of the thermal structure. The thermal stress of the rotor bar and the end ring welding position and the interference surface of the rotor and the core were analyzed. Whether the rotor bar and end ring welding position of the risk of welding, and through the thermal simulation and stress analysis, the value of interference fit that the shell and the core does not occur sliding or rising in the maximum temperature rise conditions.
Based on Ansys multiphysics simulation platform, a multiphysics coupling analysis of a vehicle asynchronous motor was carried out. The temperature rise and thermal stress of the motor under the rated working conditions and the peak operating conditions were simulated, and the temperature field distribution of each part of the motor was analyzed deeply, and the maximum allowable time of the motor peak condition was predicted. The thermal stress distribution of the internal structure of the rotor was analyzed by finite element simulation of the thermal structure. The thermal stress of the rotor bar and the end ring welding position and the interference surface of the rotor and the core were analyzed. Whether the rotor bar and end ring welding position of the risk of welding, and through the thermal simulation and stress analysis, the value of interference fit that the shell and the core does not occur sliding or rising in the maximum temperature rise conditions.
21 Modelselection Research of Insulation Impregnating Resin forHigh Voltage Motor and Wind Generator
2018, 45(4):116-121.
Abstract:
The domestic commonly used two kinds of resin impregnated resin with epoxy anhydride comparison test was selected, based on the resin properties and conventional immersion simulation coil electrical properties test, draw the conclusion: 1 # resin has good storage stability and performance of epoxy anhydride and can be used as a substitute for epoxy anhydride.
The domestic commonly used two kinds of resin impregnated resin with epoxy anhydride comparison test was selected, based on the resin properties and conventional immersion simulation coil electrical properties test, draw the conclusion: 1 # resin has good storage stability and performance of epoxy anhydride and can be used as a substitute for epoxy anhydride.
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Electric Machines & Control Application ® 2025
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
