To improve noise and vibration of Electric Power Steering (EPS) system, we focus on the reduction of the sixth-order radial force of an EPS motor by regulating its harmonic current. Because an EPS system is operated in a wide speed range, a reduction method is required to work even for dynamic motor speed. In this paper, we introduce our method and report its test result to show the reduction of sixth-order radial vibration of an EPS motor.
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