Current Harmonics, Torque Ripple & Whine Noise of Electric Machine in Electrified Vehicle Applications

Paper #:
  • 2017-01-1226

Published:
  • 2017-03-28
Abstract:
Noise and Vibration signature of an electric machine is an outcome of complex interaction between various source level disturbances like torque ripple and radial magnetic force and the surrounding structure to which the motor is attached. These can be radiated directly from the motor housing and also can be transmitted through the structural attachments (stator bolts, mounts etc.). The stator excitation current is not perfectly sinusoidal but contains different levels of harmonics. Harmonics impact Torque ripple, which in turn could translate into undesirable Motor noise. This paper addresses the impact of torque ripple on Motor whine noise. In this work, the electric machine torque ripple was computed based on the stator current that was measured during Motor dyno testing at prescribed torque and speed levels. The Motor NVH under specific torque levels was measured through testing in an anechoic transmission dynamometer cell. Correlation between torque ripple with and without harmonics and Motor radiated noise was established using standard statistical routines. The significance of this paper is to provide useful insight into the cause and effect of current harmonics on torque at the machine level, and Motor whine at a system level.
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