Patent ID: 8384265

Claim:
An inner-rotor-type motor, comprising: a casing; a shaft rotatably coupled to the casing and coupled to a permanent magnet having a magnetism-inducing surface, wherein the permanent magnet is located inside the casing; a claw-pole member coupled within the casing and having an annular portion and a plurality of salient-poles, wherein the annular portion has an inner circumferential wall, wherein each of the plurality of salient-poles is disposed between the annular portion and a respective pole plate, wherein the inner circumferential wall faces the pole plates, wherein each of the pole plates has a first side and a second side substantially extending along an axial direction of the pole plates, wherein the first side and the second side oppose each other, wherein a magnetic pole surface is formed between the first side and the second side and faces the magnetism-inducing surface of the permanent magnet, wherein an air gap is formed between the magnetic pole surface and the magnetism-inducing surface, wherein each of the pole plates has an extension portion adjacent to the first side and a shrinking portion adjacent to the second side, wherein the air gap is formed with an uneven distance between the magnetic pole surface and the magnetism-inducing surface; and a coil unit coupled to the plurality of salient-poles of the claw-pole member.