For a brushless DC motor(BLDCM)with a salient pole structured rotor,its self-inductance and mutual-inductance present sinusoidal variations periodically,which results in regular changes of three-phase terminal voltage...For a brushless DC motor(BLDCM)with a salient pole structured rotor,its self-inductance and mutual-inductance present sinusoidal variations periodically,which results in regular changes of three-phase terminal voltage waves during the unexcited period,as shown in Fig.1.展开更多
A method of improving the stability of multiple-motor drive system fed by a 3-leg single inverter has been devised that employs the averages and differences of estimated parameters for field-oriented control. The para...A method of improving the stability of multiple-motor drive system fed by a 3-leg single inverter has been devised that employs the averages and differences of estimated parameters for field-oriented control. The parameters of each motor (stator current, rotor flux, and speed) are estimated using adaptive rotor flux observers to achieve sensorless control. The validity and effective of the proposed method have been demonstrated through simulations and experiments.展开更多
The sensorless control of surface-mounted permanent magnet synchronous motor(SPMSM)usually uses quadrature phase-locked loop(QPLL)to extract the phase information of the back electromotive force to realize the rotor a...The sensorless control of surface-mounted permanent magnet synchronous motor(SPMSM)usually uses quadrature phase-locked loop(QPLL)to extract the phase information of the back electromotive force to realize the rotor angle estimation.However,the traditional QPLL has a convergence deviation of 180°when the motor is reversed,and the angle estimation error is obvious when the motor is accelerated and decelerated.To solve these problems,an enhanced QPLL(EQPLL)with polarity correction and high precision angle feedforward compensation is proposed.Firstly,the traditional phase discriminator is improved based on the two-phase stationary coordinate system,and the polarity correction function is designed by the error component of the improved phase discriminator to realize the non convergent deviation angle estimation under the forward and reverse switching conditions of the motor.In addition,the error component of the improved phase discriminator is used as the feedforward compensation signal,and the enhanced generalized integrator is used to filter it,so as to realize the angle error compensation with low delay and low noise.Finally,the proposed scheme is verified by experiment on the motor platform,and compared with the existing scheme.The experimental results show that the proposed scheme can realize the polarity correction and angle error elimination,and at the same time,the noise mean square error is reduced by 24.33%compared with the existing angle feedforward compensation scheme.展开更多
文摘For a brushless DC motor(BLDCM)with a salient pole structured rotor,its self-inductance and mutual-inductance present sinusoidal variations periodically,which results in regular changes of three-phase terminal voltage waves during the unexcited period,as shown in Fig.1.
文摘A method of improving the stability of multiple-motor drive system fed by a 3-leg single inverter has been devised that employs the averages and differences of estimated parameters for field-oriented control. The parameters of each motor (stator current, rotor flux, and speed) are estimated using adaptive rotor flux observers to achieve sensorless control. The validity and effective of the proposed method have been demonstrated through simulations and experiments.
基金Project(52272339)supported by the National Natural Science Foundation of China。
文摘The sensorless control of surface-mounted permanent magnet synchronous motor(SPMSM)usually uses quadrature phase-locked loop(QPLL)to extract the phase information of the back electromotive force to realize the rotor angle estimation.However,the traditional QPLL has a convergence deviation of 180°when the motor is reversed,and the angle estimation error is obvious when the motor is accelerated and decelerated.To solve these problems,an enhanced QPLL(EQPLL)with polarity correction and high precision angle feedforward compensation is proposed.Firstly,the traditional phase discriminator is improved based on the two-phase stationary coordinate system,and the polarity correction function is designed by the error component of the improved phase discriminator to realize the non convergent deviation angle estimation under the forward and reverse switching conditions of the motor.In addition,the error component of the improved phase discriminator is used as the feedforward compensation signal,and the enhanced generalized integrator is used to filter it,so as to realize the angle error compensation with low delay and low noise.Finally,the proposed scheme is verified by experiment on the motor platform,and compared with the existing scheme.The experimental results show that the proposed scheme can realize the polarity correction and angle error elimination,and at the same time,the noise mean square error is reduced by 24.33%compared with the existing angle feedforward compensation scheme.
