JPH031671U

JPH031671U -

Info

Publication number: JPH031671U
Application number: JP5841489U
Authority: JP
Priority date: 1989-05-19
Filing date: 1989-05-19
Publication date: 1991-01-09

Description

[Brief explanation of drawings]

第１図は本考案に係るブラシレスモータの一実
施例を示す縦断面図、第２図は第１図のマグネツ
トの着磁状態を示す斜視図、第３図は第１図のブ
ラシレスモータに用いられる周波数発電コイルを
示す配線パターン図、第４図及び第５図は従来の
異なるブラシレスモータを示す縦断面図、第６図
は従来のブラシレスモータのマグネツトの着磁状
態を示す斜視図である。１…軸受ケース、３，４…ボールベアリング、
３ａ，４ａ…外輪、３ｂ，４ｂ…内輪、５…オイ
ルレスメタル、７…磁心、９…駆動コイル、１１
…回転軸、１３…ロータヨーク、１５…側壁、１
６…主磁極、１７…マグネツト、１８…補助磁極
、２２…コイルバネ、２３…ステータ基板、２７
…突極歯、２９…ブツシユ、３１…周波数発電コ
イル。 FIG. 1 is a vertical sectional view showing an embodiment of the brushless motor according to the present invention, FIG. 2 is a perspective view showing the magnetized state of the magnet shown in FIG. 1, and FIG. FIGS. 4 and 5 are longitudinal sectional views showing different conventional brushless motors, and FIG. 6 is a perspective view showing the magnetized state of the magnet of the conventional brushless motor. 1... Bearing case, 3, 4... Ball bearing,
3a, 4a...Outer ring, 3b, 4b...Inner ring, 5...Oilless metal, 7...Magnetic core, 9...Drive coil, 11
...Rotating shaft, 13...Rotor yoke, 15...Side wall, 1
6... Main magnetic pole, 17... Magnet, 18... Auxiliary magnetic pole, 22... Coil spring, 23... Stator board, 27
...Salient pole teeth, 29...Buttons, 31...Frequency power generation coil.

Claims

[Scope of Claim for Utility Model Registration] A ball bearing fixed with an outer ring held on one end of the bearing case, a stator board made of a magnetic material disposed outside the bearing case, and an outside of the bearing case. a magnetic core arranged and around which drive coils are wound; a magnetic core placed over the magnetic core toward the stator board and rotatably supported by the ball bearing;
and a rotor yoke that is in contact with the inner ring of the ball bearing, and a rotor yoke that is fixed to the rotor yoke so as to face the tips of the magnetic pole teeth of the magnetic core with a slight distance therebetween, and is arranged with an end face facing the stator board. and a cylindrical magnet having main poles magnetized in the radial direction and alternately magnetized in the circumferential direction, wherein the magnet is magnetized in the axial direction on the inner circumferential side and the outer circumferential side, respectively. What is claimed is: 1. A brushless motor having auxiliary magnetic poles which are magnetized to alternately different polarities in the circumferential direction and different polarities in the radial direction.