Patent ID: 9172292
Filing Date: 2015-10-27
Classification: H02K

Abstract:
1. A hybrid stepping motor comprising: a rotor including a plurality of rotor teeth arranged at an equal pitch on an outer circumferential surface thereof; and a stator including a plurality of salient poles, each including a plurality of stator teeth of stator salient pole arranged to face the outer circumferential surface of the rotor via a gap, wherein the stator teeth of stator salient pole have a predetermined stator tooth thickness and are arranged at a predetermined stator tooth pitch, wherein the rotor teeth have a predetermined rotor tooth thickness and are arranged at a predetermined rotor tooth pitch, and wherein a facing area being a difference between an area of attraction poles of the stator teeth and the rotor teeth and an area of repulsion poles thereof ranges from a maximum value and a threshold value of the maximum value, and wherein the ratio of the stator tooth thickness to the stator inner diameter ranges from 0.027 to 0.034, and wherein the ratio of the rotor tooth thickness to the rotor outer diameter ranges from 0.025 to 0.031.