Mobile website
Volume 45,Issue 6,2018 Table of Contents
2018, 45(6):1-5, 26.
Abstract:
In order to make the threephase permanent magnet faulttolerant motor still meet the requirements of the torque output after singlephase fault, a faulttolerant current optimization control method was proposed. For the opencircuit fault, based on the unchangeable principle of magnetic motive force, the faulttolerant compensation current was obtained, and the compensation of the torque ripple was achieved. For the shortcircuit fault, the torque ripple caused by short circuit current and the phase missing asymmetrical torque ripple were separately compensated by the strategy of separate compensation, and then the current vector synthesis was carried out to realize the minimization of the output torque ripple when the motor was short. The simulation experiment of MATLAB/Simulink was used to verify the effectiveness of faulttolerant control method.
In order to make the threephase permanent magnet faulttolerant motor still meet the requirements of the torque output after singlephase fault, a faulttolerant current optimization control method was proposed. For the opencircuit fault, based on the unchangeable principle of magnetic motive force, the faulttolerant compensation current was obtained, and the compensation of the torque ripple was achieved. For the shortcircuit fault, the torque ripple caused by short circuit current and the phase missing asymmetrical torque ripple were separately compensated by the strategy of separate compensation, and then the current vector synthesis was carried out to realize the minimization of the output torque ripple when the motor was short. The simulation experiment of MATLAB/Simulink was used to verify the effectiveness of faulttolerant control method.
2018, 45(6):6-11.
Abstract:
In view of this problem, a method of novel sliding mode observer (SMO) of saturation function for PMSM based on the analysis of the principle of the conventional SMO was proposed. The state observation equation of back electromotive force (EMF) was constructed, and Lyapunov stability theory was used to prove the convergence. Meanwhile, the given of observer gain coefficient and low pass cutoff frequency are considered. The observation coefficient and cut off frequency of low pass filter was selected according to realtime speed feedback. The Calman filter is added to remove the measurement noise and measurement error of the system. The simulation and experiment results verified improved new type of SMO of saturation function algorithm was effective and practical.
In view of this problem, a method of novel sliding mode observer (SMO) of saturation function for PMSM based on the analysis of the principle of the conventional SMO was proposed. The state observation equation of back electromotive force (EMF) was constructed, and Lyapunov stability theory was used to prove the convergence. Meanwhile, the given of observer gain coefficient and low pass cutoff frequency are considered. The observation coefficient and cut off frequency of low pass filter was selected according to realtime speed feedback. The Calman filter is added to remove the measurement noise and measurement error of the system. The simulation and experiment results verified improved new type of SMO of saturation function algorithm was effective and practical.
2018, 45(6):12-16.
Abstract:
In order to ensure the orientation accuracy of rotor flux, a method of online correction of rotor flux linkage angle was proposed. By measuring the variation of phase current during zero voltage vector in space voltage vector PWM, the accurate angle of rotor flux could be calculated. The regulator adjusts the frequency of the slip angle online to correct the rotor flux angle so as to improve the motor control performance. The correctness of the theory and the validity of the method were verified through experiments.
In order to ensure the orientation accuracy of rotor flux, a method of online correction of rotor flux linkage angle was proposed. By measuring the variation of phase current during zero voltage vector in space voltage vector PWM, the accurate angle of rotor flux could be calculated. The regulator adjusts the frequency of the slip angle online to correct the rotor flux angle so as to improve the motor control performance. The correctness of the theory and the validity of the method were verified through experiments.
2018, 45(6):17-20, 33.
Abstract:
The suspension force principle of the bearingless brushless DC motor was analyzed, and the mathematical model of suspension force was deduced. The suspension force control system was designed. By using MATLAB software, the control system model had been established and the simulation experiments had been completed. Finally, the experimental prototype was designed. The experimental results showed that the motor could stable operation, and the rotor could be stable suspended in the center.
The suspension force principle of the bearingless brushless DC motor was analyzed, and the mathematical model of suspension force was deduced. The suspension force control system was designed. By using MATLAB software, the control system model had been established and the simulation experiments had been completed. Finally, the experimental prototype was designed. The experimental results showed that the motor could stable operation, and the rotor could be stable suspended in the center.
2018, 45(6):21-26.
Abstract:
The optimal voltage vector selection strategy was proposed for the problem of unreasonable torque ripple in direct torque control of surface permanent magnet synchronous motor realized by traditional switch table. According to the law of voltage vector and flux linkage, the voltage vector selection interval table was obtained, and the cost function of flux linkage and torque error was established. Based on the predictive control, the voltage vector in interval was selected optimally, and achieved by the space vector modulation technique. The simulation results showed that the optimal voltage vector selection strategy proposed can completely eliminate the unreasonable torque ripple caused by the improper selection of the voltage vector of the switch table, the average error of the torque was reduced by 58% and the peak error was reduced by 67%, the average error of the stator flux decreases by 28% and the peak error was reduced by 53%. At the same time, the use of space vector modulation technology makes the inverter switching frequency constant.
The optimal voltage vector selection strategy was proposed for the problem of unreasonable torque ripple in direct torque control of surface permanent magnet synchronous motor realized by traditional switch table. According to the law of voltage vector and flux linkage, the voltage vector selection interval table was obtained, and the cost function of flux linkage and torque error was established. Based on the predictive control, the voltage vector in interval was selected optimally, and achieved by the space vector modulation technique. The simulation results showed that the optimal voltage vector selection strategy proposed can completely eliminate the unreasonable torque ripple caused by the improper selection of the voltage vector of the switch table, the average error of the torque was reduced by 58% and the peak error was reduced by 67%, the average error of the stator flux decreases by 28% and the peak error was reduced by 53%. At the same time, the use of space vector modulation technology makes the inverter switching frequency constant.
2018, 45(6):27-33.
Abstract:
Based on selfadaptive identification theory, an easily realized reconfigurable method for the control system was presented, including a full state observer used to acquire the load torque state and a selfadaptive module used to lead the convergence of reconfigurable system. By taking the electromagnetic torque and the load torque observing state as input of reconfigurable system, the moment of inertia could be acquired when the system converges. The feasibility and efficiency of the proposed method had been verified by the simulation results, different inertia values set in the model can be identified accurately.
Based on selfadaptive identification theory, an easily realized reconfigurable method for the control system was presented, including a full state observer used to acquire the load torque state and a selfadaptive module used to lead the convergence of reconfigurable system. By taking the electromagnetic torque and the load torque observing state as input of reconfigurable system, the moment of inertia could be acquired when the system converges. The feasibility and efficiency of the proposed method had been verified by the simulation results, different inertia values set in the model can be identified accurately.
2018, 45(6):34-39.
Abstract:
To solve the problem of the flux ripple, big speed overshoot and slow dynamic response speed in the space vector direct torque control of permanent magnet synchronous motor, the controller of speed loop was replaced, speed loop and torque loop with Supertwisting slide mode controller based on the theory Supertwisting slide mode. The proposed control theory was simulated and verified by the software of MATLAB/Simulink simulation. The simulation results showed that the proposed control theory could successfully suppress the overshoot of speed, improve the dynamic response speed, flux and torque, and restrain the torque and flux ripple.
To solve the problem of the flux ripple, big speed overshoot and slow dynamic response speed in the space vector direct torque control of permanent magnet synchronous motor, the controller of speed loop was replaced, speed loop and torque loop with Supertwisting slide mode controller based on the theory Supertwisting slide mode. The proposed control theory was simulated and verified by the software of MATLAB/Simulink simulation. The simulation results showed that the proposed control theory could successfully suppress the overshoot of speed, improve the dynamic response speed, flux and torque, and restrain the torque and flux ripple.
2018, 45(6):40-45, 67.
Abstract:
In the field of power electronic inverter control, the virtual synchronous generator (VSG) technology realized by simulating the synchronous characteristics of synchronous generator had been fully researched as the main means to improve the stability of power system in recent years. And the stability of the system grid frequency was improved by solving the problem of the inertia of the distributed energy (DG) gridconnected system. However, when the power grid strength changes, the original VSG control strategy could not maintain the system frequency stability. In order to further improve the effect of VSG on frequency stability, the frequency stability of VSG system when the strength of grid is changed on the basis of traditional VSG control strategy was analyzed, and studies the factors that affect the change of power intensity. It was suggested that the frequency stability can be improved by increasing the system inertia in VSG. Finally, the effectiveness of the proposed method was verified by MATLAB/Simulink simulation tool.
In the field of power electronic inverter control, the virtual synchronous generator (VSG) technology realized by simulating the synchronous characteristics of synchronous generator had been fully researched as the main means to improve the stability of power system in recent years. And the stability of the system grid frequency was improved by solving the problem of the inertia of the distributed energy (DG) gridconnected system. However, when the power grid strength changes, the original VSG control strategy could not maintain the system frequency stability. In order to further improve the effect of VSG on frequency stability, the frequency stability of VSG system when the strength of grid is changed on the basis of traditional VSG control strategy was analyzed, and studies the factors that affect the change of power intensity. It was suggested that the frequency stability can be improved by increasing the system inertia in VSG. Finally, the effectiveness of the proposed method was verified by MATLAB/Simulink simulation tool.
2018, 45(6):46-50, 61.
Abstract:
The numerical calculation of YX3 small motor external cooling system was carried out by using computational fluid dynamics method. The influence of blade main structure parameters on the ventilation performance of external cooling fan of small motor was analyzed. From the perspective of reducing the input power of the fan, the fan structure was improved and experimentally verified. The result showed that mechanical loss of the motor with improved fan was reduced by 39.1%, the temperature didn’t change basically and the efficiency was increased by 0.6%.
The numerical calculation of YX3 small motor external cooling system was carried out by using computational fluid dynamics method. The influence of blade main structure parameters on the ventilation performance of external cooling fan of small motor was analyzed. From the perspective of reducing the input power of the fan, the fan structure was improved and experimentally verified. The result showed that mechanical loss of the motor with improved fan was reduced by 39.1%, the temperature didn’t change basically and the efficiency was increased by 0.6%.
2018, 45(6):51-55.
Abstract:
Based on the mechanism of concentric permanent magnet gear, a new model of low speed and high torque permanent magnet compound motor was designed, and the calculation method of the basic parameters of the model was given. By controlling the variable method, the parameters such as the length of the pole block, the thickness of the stator punch and the thickness of the inner rotor yoke were changed, and the parameters were optimized by Ansoft finite element simulation software. The results showed that the motor torque density and reduce speed fluctuations were effectively improved.
Based on the mechanism of concentric permanent magnet gear, a new model of low speed and high torque permanent magnet compound motor was designed, and the calculation method of the basic parameters of the model was given. By controlling the variable method, the parameters such as the length of the pole block, the thickness of the stator punch and the thickness of the inner rotor yoke were changed, and the parameters were optimized by Ansoft finite element simulation software. The results showed that the motor torque density and reduce speed fluctuations were effectively improved.
2018, 45(6):56-61.
Abstract:
In the inverterpowered permanent magnet synchronous motor (PMSM), high frequency current time harmonics was produced by the high frequency switch tube, and the eddy current loss of permanent magnet (PM) was increased. Considering the current time harmonics in PM, an analytic equation about the eddy current loss was proposed. The relationship between the dimension of PM, penetration depth and eddy current loss was deduced in details. Then the conclusion was drawn. The eddy current loss of PM was greatest when the axial or circumferential dimension of PM was twice the penetration depth, and the accuracy of the conclusion was verified by an ideal 3D model. In addition, the eddy current loss simulation of a 48slot 8pole watercooled PMSM powered by an inverter was taken as an example. The results showed that a reasonable number of segments in PM could effectively reduce the eddy current loss.
In the inverterpowered permanent magnet synchronous motor (PMSM), high frequency current time harmonics was produced by the high frequency switch tube, and the eddy current loss of permanent magnet (PM) was increased. Considering the current time harmonics in PM, an analytic equation about the eddy current loss was proposed. The relationship between the dimension of PM, penetration depth and eddy current loss was deduced in details. Then the conclusion was drawn. The eddy current loss of PM was greatest when the axial or circumferential dimension of PM was twice the penetration depth, and the accuracy of the conclusion was verified by an ideal 3D model. In addition, the eddy current loss simulation of a 48slot 8pole watercooled PMSM powered by an inverter was taken as an example. The results showed that a reasonable number of segments in PM could effectively reduce the eddy current loss.
2018, 45(6):62-67.
Abstract:
In order to take both of the lowspeed and hightorque characteristics of permanent magnet machines and the operating range of constant power range into account, a fluxcontrollable permanent magnet vernier (RVFCPMV) machine was proposed. Taking a threephase RVFCPMV machine with 22/2pole as an example, the RVFCPMV machine topology was introduced firstly. The equivalent magnetic circuit method was used to reveal the characteristics of lowspeed and hightorque. Different with the traditional flux weakening method by injecting daxis demagnetization current component into armature windings, a new flux weakening control method was proposed, of which the key was to change the magnetic circuit reluctance based on the nonlinear performance of ferromagnetic materials by adjusting the excitation current. The electromagnetic performances of RVFCPMV machine were calculated and analyzed using finite element analysis, which verified the characteristics of lowspeed and hightorque output and the capacity of flux weakening control.
In order to take both of the lowspeed and hightorque characteristics of permanent magnet machines and the operating range of constant power range into account, a fluxcontrollable permanent magnet vernier (RVFCPMV) machine was proposed. Taking a threephase RVFCPMV machine with 22/2pole as an example, the RVFCPMV machine topology was introduced firstly. The equivalent magnetic circuit method was used to reveal the characteristics of lowspeed and hightorque. Different with the traditional flux weakening method by injecting daxis demagnetization current component into armature windings, a new flux weakening control method was proposed, of which the key was to change the magnetic circuit reluctance based on the nonlinear performance of ferromagnetic materials by adjusting the excitation current. The electromagnetic performances of RVFCPMV machine were calculated and analyzed using finite element analysis, which verified the characteristics of lowspeed and hightorque output and the capacity of flux weakening control.
2018, 45(6):68-71, 101.
Abstract:
In order to solve the problem that the motor running performance of the axial magnetic field permanent magnet synchronous motor was too high, the rotor of the motor was studied deeply. Firstly, the finite element model of the motor was established by using the finite element analysis software of Maxwell 3D electromagnetic field. The electromagnetic distribution of the motor was simulated and the average eddy current loss was calculated. The eddy current loss of the permanent magnet had been significantly reduced, and the rotor yoke had no harmonics.
In order to solve the problem that the motor running performance of the axial magnetic field permanent magnet synchronous motor was too high, the rotor of the motor was studied deeply. Firstly, the finite element model of the motor was established by using the finite element analysis software of Maxwell 3D electromagnetic field. The electromagnetic distribution of the motor was simulated and the average eddy current loss was calculated. The eddy current loss of the permanent magnet had been significantly reduced, and the rotor yoke had no harmonics.
2018, 45(6):72-75, 116.
Abstract:
A calculation method of reactance parameters for the hybrid excitation permanent magnet generator was proposed. A hybrid excitation permanent magnet synchronous generator rated at 7.5 kW and 1 500 r/min was verified by the experimental results. It showed that the calculated results were in good accordance with the measured results, and it could be a great help to the designing of the hybrid excitation permanent magnet synchronous generator.
A calculation method of reactance parameters for the hybrid excitation permanent magnet generator was proposed. A hybrid excitation permanent magnet synchronous generator rated at 7.5 kW and 1 500 r/min was verified by the experimental results. It showed that the calculated results were in good accordance with the measured results, and it could be a great help to the designing of the hybrid excitation permanent magnet synchronous generator.
2018, 45(6):76-79.
Abstract:
Aiming at the requirement of improving the precision of core manufacturing for the development of YE4 motor, the purpose of reducing the burr height is achieved through the design of stamping die, selection and treatment of material and the matching of punching machine and silicon steel material. The method of improving the loading of stator core was studied to improve the superposition coefficient and reduce the motor iron consumption.
Aiming at the requirement of improving the precision of core manufacturing for the development of YE4 motor, the purpose of reducing the burr height is achieved through the design of stamping die, selection and treatment of material and the matching of punching machine and silicon steel material. The method of improving the loading of stator core was studied to improve the superposition coefficient and reduce the motor iron consumption.
2018, 45(6):80-87, 108.
Abstract:
The convolutional neural network was introduced into the field of fan fault detection for the first time, a new method based on one dimensional convolution neural network (CNNs) and SoftMax classifier was proposed, which was applied to the fault diagnosis of gearbox planetary gear under different operating conditions. The structure of the network was a double layer structure, the improved convolutional neural network was used for feature extraction, and the SoftMax classifier was used to classify the health status of the signal. Compared with the traditional intelligent algorithm, this method had the advantages of fewer training samples, direct training of network with raw data, high computational efficiency, and it can meet the needs of realtime diagnosis. The data of multi operating conditions are fused and verified by experiments. The experimental results showed that the method can effectively diagnose the gear faults in planetary gear box under different working conditions.
The convolutional neural network was introduced into the field of fan fault detection for the first time, a new method based on one dimensional convolution neural network (CNNs) and SoftMax classifier was proposed, which was applied to the fault diagnosis of gearbox planetary gear under different operating conditions. The structure of the network was a double layer structure, the improved convolutional neural network was used for feature extraction, and the SoftMax classifier was used to classify the health status of the signal. Compared with the traditional intelligent algorithm, this method had the advantages of fewer training samples, direct training of network with raw data, high computational efficiency, and it can meet the needs of realtime diagnosis. The data of multi operating conditions are fused and verified by experiments. The experimental results showed that the method can effectively diagnose the gear faults in planetary gear box under different working conditions.
2018, 45(6):88-94.
Abstract:
A linear active disturbance rejection controller (LADRC) was designed to estimate the system unmodeled part and compensate the interference, thereby achieve output power stable when wind speed was above rated wind speed. And the model compensation method was used to optimize the LADRC, to reduce the number of parameters that need to be set and improve system control accuracy. The controller was simulated in three different wind conditions in the 300 kW wind turbines. The simulation results showed that it can quickly adjust the output fluctuation caused by wind velocity variation, made the system output stable and had small overshoot in any wind speed stage. Moreover, the system had good stability and robustness.
A linear active disturbance rejection controller (LADRC) was designed to estimate the system unmodeled part and compensate the interference, thereby achieve output power stable when wind speed was above rated wind speed. And the model compensation method was used to optimize the LADRC, to reduce the number of parameters that need to be set and improve system control accuracy. The controller was simulated in three different wind conditions in the 300 kW wind turbines. The simulation results showed that it can quickly adjust the output fluctuation caused by wind velocity variation, made the system output stable and had small overshoot in any wind speed stage. Moreover, the system had good stability and robustness.
2018, 45(6):95-101.
Abstract:
Aiming at the singlephase open circuit fault of fivephase permanent magnet brushless motor for electric vehicle, a faulttolerant control strategy based on asymmetric space vector pulse width modulation control strategy was proposed. The design of a new type of fault tolerant control was divided into two parts, the five phase permanent magnet brushless motor drive system for open circuit voltage vector relationship under fault was analyzed, and then the space vector modulation algorithm was improved, which in a sector switch state of asymmetric waveform as output. The asymmetric space pulse width vector modulation could reduce the current total harmonic distribution and torque ripple of normal phases. Based on the experimental platform, the experimental results showed that the new faulttolerant adjustable achieved low torque ripple during system failure and kept good dynamic performance.
Aiming at the singlephase open circuit fault of fivephase permanent magnet brushless motor for electric vehicle, a faulttolerant control strategy based on asymmetric space vector pulse width modulation control strategy was proposed. The design of a new type of fault tolerant control was divided into two parts, the five phase permanent magnet brushless motor drive system for open circuit voltage vector relationship under fault was analyzed, and then the space vector modulation algorithm was improved, which in a sector switch state of asymmetric waveform as output. The asymmetric space pulse width vector modulation could reduce the current total harmonic distribution and torque ripple of normal phases. Based on the experimental platform, the experimental results showed that the new faulttolerant adjustable achieved low torque ripple during system failure and kept good dynamic performance.
2018, 45(6):102-108.
Abstract:
Based on the Maxwell 2D and Simplorer cosimulation platform, a permanent magnet synchronous motor (PMSM) for electric vehicle traction with a rated power of 20 kW was used to study the simulation model of the motor traction system which could consider the motor saturation problem and the loss, analyzing and comparing the constant torque interval id=0 control and MTPA control, high speed interval id=0 controled and weaked the magnetic control traction characteristicsspecific comparative analysid of the motor flux, current, torque ripple, drive efficiency and other characteristics. And the correctness of the simulation method was validated through experimental tests, and provided reference for the control simulation of electric traction motor speed control system.
Based on the Maxwell 2D and Simplorer cosimulation platform, a permanent magnet synchronous motor (PMSM) for electric vehicle traction with a rated power of 20 kW was used to study the simulation model of the motor traction system which could consider the motor saturation problem and the loss, analyzing and comparing the constant torque interval id=0 control and MTPA control, high speed interval id=0 controled and weaked the magnetic control traction characteristicsspecific comparative analysid of the motor flux, current, torque ripple, drive efficiency and other characteristics. And the correctness of the simulation method was validated through experimental tests, and provided reference for the control simulation of electric traction motor speed control system.
2018, 45(6):109-116.
Abstract:
In order to alleviate the problem of energy shortage and environmental pollution, new energy vehicles have been rapidly developed and promoted, and have become an important research direction of today′s automobile industry. Based on the types of new energy motor vehicles and the selection and application of new energy motor vehicles at home and abroad, the development trend of the new energy motor vehicle motor and the test items related to the evaluation are analyzed and studied.
In order to alleviate the problem of energy shortage and environmental pollution, new energy vehicles have been rapidly developed and promoted, and have become an important research direction of today′s automobile industry. Based on the types of new energy motor vehicles and the selection and application of new energy motor vehicles at home and abroad, the development trend of the new energy motor vehicle motor and the test items related to the evaluation are analyzed and studied.
2018, 45(6):117-121.
Abstract:
The fundamental and the electric capability of ac-servo system were analyzed; meanwhile, the main performance evaluation index and test methods of AC servo system were introduced. Accordingly, according to the requirements and characteristics of the AC servo system test in GB/T 16439-2009 “General specification for AC servo system”, a test platform for AC servo system testing was developed, and the methods of AC servo system with the platform were introduced. The design of the test system provides an important reference for the development of similar test stations.
The fundamental and the electric capability of ac-servo system were analyzed; meanwhile, the main performance evaluation index and test methods of AC servo system were introduced. Accordingly, according to the requirements and characteristics of the AC servo system test in GB/T 16439-2009 “General specification for AC servo system”, a test platform for AC servo system testing was developed, and the methods of AC servo system with the platform were introduced. The design of the test system provides an important reference for the development of similar test stations.
You are thevisitor
沪ICP备16038578号-3
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.
