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Permanent Magnet Motor Torsional Resonance Noise Reduction by Rotor Skew Phase Adjustment
Author(s) -
Arata Masanori,
Takahashi Norio,
Mochizuki Motoyasu,
Araki Takashi,
Hanai Takashi
Publication year - 2015
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22701
Subject(s) - skew , torque ripple , rotor (electric) , torque , automotive engineering , vibration , magnet , noise (video) , control theory (sociology) , engineering , regenerative brake , switched reluctance motor , computer science , induction motor , electrical engineering , direct torque control , physics , voltage , acoustics , brake , telecommunications , control (management) , artificial intelligence , image (mathematics) , thermodynamics
SUMMARY Hybrid Vehicles (HEVs) and Electric Vehicles (EVs) improve drive efficiency and reduce CO 2 emissions by regenerative braking and operating the engine under optimum conditions. It is desirable to decrease the motor size and increase the maximum torque to minimize driving units. For these purposes, motors employing permanent magnets are now commonly used. The motor driving systems of HEVs and EVs must operate over variable speed ranges of up to 1:5. Over this large range, smooth, silent operation is desirable and important. The skew method is often adopted to ensure a smooth start and stop and silent operation by reducing torque ripple. However, this method possibly causes noise and motor vibration. This paper describes the mechanism of torsional resonance noise and vibrations arising from the skew method and a countermeasure to decrease them by optimizing the skew phase distribution on the rotating axis.