Patent ID: 9548633
Date: 2017-01-17
CPC Classifications: H02K

Claim:
1. A stator of a motor comprising: a yoke of a tubular shape; and teeth each extending radially inwardly from the yoke, each tooth having an extending portion and an increased-width portion formed at a tip end of the extending portion and having a greater circumferential width than that of the extending portion; wherein the extending portion has (i) a constant-width portion extending radially in a straight line shape with a circumferential width (d wherein the narrower portion has a circumferential cross-section at the bottoms of the arcuate grooves that is configured large enough to pass a main alternating magnetic flux therethrough without causing magnetic saturation to the main alternating magnetic flux at local maxima of the main alternating flux, while configured small enough to cause magnetic saturation at the narrower portion to a high harmonic magnetic flux, which is superimposed on the main alternating magnetic flux by influence of a high frequency carrier signal used for PWM (Pulse With Modulation), to thereby filter out the high harmonic magnetic flux at the narrower portion, and further wherein the narrower portion is configured such that a ratio between the smallest width (d