Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the s...Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the speed range under finite DC-bus voltage,extensive research on field weakening(FW)control strategies has been conducted.This paper summarizes the major FW control strategies of PMSMs,which are categorized into calculation-based methods,voltage closed-loop control methods,and model predictive control related methods.The existing strategies are analyzed and compared according to performance,robustness,and execution difficulty,which can facilitate the implementation of FW control.展开更多
This paper presents the speed control of a separately excited DC motor using Neural Network (NN) controller in field weakening region. In armature control, speed controller has been used in outer loop while current co...This paper presents the speed control of a separately excited DC motor using Neural Network (NN) controller in field weakening region. In armature control, speed controller has been used in outer loop while current controller in inner loop is used. The function of NN is to predict the field current that realizes the field weakening to drive the motor over rated speed. The parameters of NN are optimized by the Social Spider Optimization (SSO) algorithm. The system has been implemented using MATLAB/SIMULINK software. The simulation results show that the proposed method gives a good performance and is feasible to be applied instead of others conventional combined control methods.展开更多
In this study, we investigate the demagnetization resistance of a concentrated winding IPMSM （interior permanent magnet synchronous motor） accounting for field weakening control by changing the magnetization directi...In this study, we investigate the demagnetization resistance of a concentrated winding IPMSM （interior permanent magnet synchronous motor） accounting for field weakening control by changing the magnetization direction of the permanent magnet under a high-temperature environment. IPMSMs are investigated by FEA （finite element analysis） using the same volume of the permanent magnet while changing the magnet’s width, thickness and magnetic field orientation angle. FEA found that a V-shaped angle Va = 100° and a changed magnet length of 97% using an oblique magnetic-field-oriented magnet strike a good balance between demagnetization resistance and torque at 180 ℃. Comparison between demagnetization of negative d-axis current （current phase β = 90°） and demagnetization of field weakening control （β = 80°） using concentrated winding IPMSM with V-shaped angle Va = 100° is conducted. With the demagnetization factor at β = 80° for β = 90°, the demagnetization factor 0.39 （2.6 times） at α = 0° decreases to 0.23 （4.3 times） at α = 20°. The demagnetization resistance in the field weakening control is further improved.展开更多
Permanent magnet synchronous motor(PMSM)has the advantages of high efficiency,high power density and high reliability.It has been widely used in electric vehicles,rail transit,industrial transmission and other fields....Permanent magnet synchronous motor(PMSM)has the advantages of high efficiency,high power density and high reliability.It has been widely used in electric vehicles,rail transit,industrial transmission and other fields.Compared with the traditional PMSM control strategy,the Indirect stator-quantities control(ISC)of low torque ripple induction motor has high dynamic response performance in the whole speed range,with high stability and strong security.However,due to the inherent characteristics of PMSM,there are still some difficulties in applying ISC strategy,such as solving the load angle corresponding to the current torque,realizing the maximum torque per ampere(MTPA)control and flux weakening control method in the stator field oriented control algorithm of PMSM.In this paper,theoretical analysis and discussion are carried out for the above difficulties,and an indirect stator vector control(ISC)method for PMSM is proposed.Finally,combined with the electric drive application platform of electric vehicle,the simulation and experimental results verify that the proposed ISC control strategy of PMSM also has good dynamic and steady-state performance in the whole speed range.展开更多
The electrically excited synchronous motor(ESM)has typically small synchronous inductance values and quite low transient values because of the damper windings mounted on the rotor.Therefore,the torque and stator flux ...The electrically excited synchronous motor(ESM)has typically small synchronous inductance values and quite low transient values because of the damper windings mounted on the rotor.Therefore,the torque and stator flux linkage ripples are high in the direct torque control(DTC)drive of the ESM with a torque and flux linkage hysteresis controller(basic DTC).A DTC scheme with space vector modulation(SVM)for the ESM was investigated in this paper.It is based on the compensation of the stator flux link-age vector error using the space vector modulation in order to decrease the torque and flux linkage ripples and produce fixed switching frequency under the principle that the torque is controlled by the torque angle in the ESM.Compared with the basic DTC,the results of the simulation and experiment show that the torque and flux linkage ripples are reduced,the maximum current value is decreased during the startup,and the current distortion is much smaller in the steady-state under the SVM-DTC.The field-weakening control is incorporated with the SVM-DTC successfully.展开更多
基金supported by the Research Fund for the National Natural Science Foundation of China(52125701).
文摘Due to high power density,high efficiency,and accurate control performance,permanent magnet synchronous motors(PMSMs)have been widely adopted in equipment manufacturing and energy transformation fields.To expand the speed range under finite DC-bus voltage,extensive research on field weakening(FW)control strategies has been conducted.This paper summarizes the major FW control strategies of PMSMs,which are categorized into calculation-based methods,voltage closed-loop control methods,and model predictive control related methods.The existing strategies are analyzed and compared according to performance,robustness,and execution difficulty,which can facilitate the implementation of FW control.
文摘This paper presents the speed control of a separately excited DC motor using Neural Network (NN) controller in field weakening region. In armature control, speed controller has been used in outer loop while current controller in inner loop is used. The function of NN is to predict the field current that realizes the field weakening to drive the motor over rated speed. The parameters of NN are optimized by the Social Spider Optimization (SSO) algorithm. The system has been implemented using MATLAB/SIMULINK software. The simulation results show that the proposed method gives a good performance and is feasible to be applied instead of others conventional combined control methods.
文摘In this study, we investigate the demagnetization resistance of a concentrated winding IPMSM （interior permanent magnet synchronous motor） accounting for field weakening control by changing the magnetization direction of the permanent magnet under a high-temperature environment. IPMSMs are investigated by FEA （finite element analysis） using the same volume of the permanent magnet while changing the magnet’s width, thickness and magnetic field orientation angle. FEA found that a V-shaped angle Va = 100° and a changed magnet length of 97% using an oblique magnetic-field-oriented magnet strike a good balance between demagnetization resistance and torque at 180 ℃. Comparison between demagnetization of negative d-axis current （current phase β = 90°） and demagnetization of field weakening control （β = 80°） using concentrated winding IPMSM with V-shaped angle Va = 100° is conducted. With the demagnetization factor at β = 80° for β = 90°, the demagnetization factor 0.39 （2.6 times） at α = 0° decreases to 0.23 （4.3 times） at α = 20°. The demagnetization resistance in the field weakening control is further improved.
文摘Permanent magnet synchronous motor(PMSM)has the advantages of high efficiency,high power density and high reliability.It has been widely used in electric vehicles,rail transit,industrial transmission and other fields.Compared with the traditional PMSM control strategy,the Indirect stator-quantities control(ISC)of low torque ripple induction motor has high dynamic response performance in the whole speed range,with high stability and strong security.However,due to the inherent characteristics of PMSM,there are still some difficulties in applying ISC strategy,such as solving the load angle corresponding to the current torque,realizing the maximum torque per ampere(MTPA)control and flux weakening control method in the stator field oriented control algorithm of PMSM.In this paper,theoretical analysis and discussion are carried out for the above difficulties,and an indirect stator vector control(ISC)method for PMSM is proposed.Finally,combined with the electric drive application platform of electric vehicle,the simulation and experimental results verify that the proposed ISC control strategy of PMSM also has good dynamic and steady-state performance in the whole speed range.
基金supported by the Aeronautics Key Science Foundation of China(No.98Z52001)the Fifteen Aeronautics Pre-research Item of China(No.40200201).
文摘The electrically excited synchronous motor(ESM)has typically small synchronous inductance values and quite low transient values because of the damper windings mounted on the rotor.Therefore,the torque and stator flux linkage ripples are high in the direct torque control(DTC)drive of the ESM with a torque and flux linkage hysteresis controller(basic DTC).A DTC scheme with space vector modulation(SVM)for the ESM was investigated in this paper.It is based on the compensation of the stator flux link-age vector error using the space vector modulation in order to decrease the torque and flux linkage ripples and produce fixed switching frequency under the principle that the torque is controlled by the torque angle in the ESM.Compared with the basic DTC,the results of the simulation and experiment show that the torque and flux linkage ripples are reduced,the maximum current value is decreased during the startup,and the current distortion is much smaller in the steady-state under the SVM-DTC.The field-weakening control is incorporated with the SVM-DTC successfully.
