| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.39 ( October 1998 ) Electrical Steel ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Effects of Core Materials on Efficiency of
Inverter Drive Motor Atsuhito Honda, Keiji Sato, Isamu Ohyama |
| Synopsis: Properties of a 3-phase 6-pole 400 W inverter drive motor, using 6 kinds of non-oriented Si steel sheets as stator core materials, were investigated. PWM (pulse width modulation) inverter wave frequency was changed from 30 to 300 Hz and a frequency of 40 times of the fundamental inverter frequency was adopted as the carrier wave. It was found that the effect of Si content on motor efficiency is small when the PWM frequency is low, while when the PWM frequency is high, the motor efficiency rises as Si content of the core material increases. There exists an optimum Si content of the material depending on the design of the flux density of a motor. Both reduction in the thickness of material and stress relief annealing of stator cores also improve the motor efficiency. |
| TextiPDF: 5P/239kbj |