Abstract
In this paper, we present a new analytical method to calculate the required amplitudes and phase angles of the injected harmonic currents, to generate a determined torque ripple for synchronous machines with surface-mounted permanent magnets. First, we described the machine equations as a function of the phase current and the back electromotive force. We then introduced a new asymmetrical power system. After combining the equations, we established a linear system of equations. The solution of the equation system yielded the amplitudes and phase angles of the harmonic currents to be injected. Finally, we validated the method with several finite element method simulations. With this method, a previously defined torque ripple could be generated very accurately for synchronous machines with surface magnets.
Highlights
Permanent-magnet synchronous machines (PMSM) have largely established themselves in recent years as electric traction machines (ETM), thanks to their high power density and low maintenance requirements
To imitate the low-frequency noise spectrum of an internal combustion engine, which is far more accepted by the population than the narrow-banded, high-frequency noise spectrum of electric drives. This is the starting point of this publication, which presents an analytical method for determining the amplitudes and phase angles of current harmonics for synchronous machines with surface magnets (SPMSM) in order to obtain a desired torque fluctuation
The deviations were less than 2% for both machines
Summary
Permanent-magnet synchronous machines (PMSM) have largely established themselves in recent years as electric traction machines (ETM), thanks to their high power density and low maintenance requirements. The electric drive train of a HEV or EV consists of more than just the ETM It should be aimed at an ETM without torque ripple, in order to reduce noise and vibration emissions. To imitate the low-frequency noise spectrum of an internal combustion engine, which is far more accepted by the population than the narrow-banded, high-frequency noise spectrum of electric drives This is the starting point of this publication, which presents an analytical method for determining the amplitudes and phase angles of current harmonics for synchronous machines with surface magnets (SPMSM) in order to obtain a desired torque fluctuation
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