Abstract
Permanent magnet synchronous motors (PMSMs) with inverters are widely used in electric vehicles (EVs). However, current harmonics caused by the nonlinearity of the inverter generate torque ripples and give rise to torsional vibration in the vehicle driveline. This paper proposes a new compensation method to suppress the torque ripples. This method extracts the 6th-order harmonic component online from the d-axis and q-axis currents with the approximate Fourier transform, and adopts a harmonic current PI regulator to calculate compensation voltage, which is added to the voltage reference to compensate the nonlinearity of the inverter. After correcting the current distortion and improving the motor torque smoothness, the torsional vibration of the driveline caused by the motor pulsating torque is reduced. According to the simulation results, the 6th-order of motor torque ripple and the torsional vibration response is reduced about 26–28%, which confirms the validity of the proposed strategy. The proposed method does not need any additional hardware and can be implemented broadly in PMSM drives.
Highlights
Permanent magnet synchronous motors (PMSMs) fed by pulse-width modulated voltage-source inverter (PWM VSI) have been widely used in electric vehicles (EVs), thanks to their high efficiency, high power density and outstanding controllability
Spatial harmonics of permanent magnet (PM) flux-linkage caused by motor structure and current harmonics resulted from the nonlinearity of the inverter generate undesired torque ripples
We propose a dead-time compensation method based on harmonic current suppression, which aims to suppress pulsating torque caused by the nonlinearity of the inverter
Summary
Permanent magnet synchronous motors (PMSMs) fed by pulse-width modulated voltage-source inverter (PWM VSI) have been widely used in electric vehicles (EVs), thanks to their high efficiency, high power density and outstanding controllability. In [24], to reduce vibration and booming noise of vehicle body of an EV caused by motor torque fluctuations, researchers propose a torque ripple suppression method called programmed current control, which reduces the ripples caused by high-order components of magnetic flux. We propose a dead-time compensation method based on harmonic current suppression, which aims to suppress pulsating torque caused by the nonlinearity of the inverter. This method extracts the Energies 2018, 11, x FOR PEER REVIEW. Hardware circuits and can becircuits implemented broadly in PMSM drives
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