JPS6141383U

JPS6141383U - brushless motor

Info

Publication number: JPS6141383U
Application number: JP10925585U
Authority: JP
Inventors: 良平打田; 賢至川岸
Original assignee: 三菱電機株式会社
Priority date: 1985-07-17
Filing date: 1985-07-17
Publication date: 1986-03-15

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Ｗ，１図ａはこの考案のブラシレスモータの一実施
例の縦断面図、第１図ｂは第１図ａのＩ７Ｉ線に沿って
切断して示す断面図、第２図ａないし第．２図Ｃはそれ
ぞれ同上ブラシレスモータの動作を説明するための図、
第３図は同上ブラシレスモータの駆動回路を示す回路図
、第４図ないし第６図はそれぞれこの考案のブラシレス
モータの第２のないし第４の実施例の横断面図、第７図
ａはこの考案のブラシレスモータの第５の実施例におけ
るロータ界磁磁石を平面上に展開した図、第７図ｂほこ
の考案のブラシレスモータの第５の実施例の断面図、第
８図ａはこの考案のブラシレスモータの第６の実施例の
縦断面図、第８図ｂは第８図ａの横断面図である。１・・・回転軸、２〜５，５３，６２，７２，８４・・
・固定子巻線、−６，５１，６１，８７・・・ステータ
、８，４２，５２，６４，７４，８３・・・ロータ界磁
磁石、１２・・・ホール素子、１４・・・直流電源、１
７．１８・・・比較器、２１．２２・・・トランジスタ
。なお、図中同一符号は同一または相当部分を示す。W, 1 Figure a is a longitudinal sectional view of an embodiment of the brushless motor of this invention, Figure 1b is a sectional view taken along line I7I in Figure 1a, and Figures 2a to 2. Figure 2C is a diagram for explaining the operation of the same brushless motor as above, respectively.
FIG. 3 is a circuit diagram showing the drive circuit of the same brushless motor as above, FIGS. 4 to 6 are cross-sectional views of second to fourth embodiments of the brushless motor of this invention, and FIG. FIG. 7b is a cross-sectional view of the fifth embodiment of the brushless motor of the invention, and FIG. 8a is a cross-sectional view of the fifth embodiment of the brushless motor of the invention. FIG. 8b is a longitudinal cross-sectional view of the sixth embodiment of the brushless motor, and FIG. 8b is a cross-sectional view of FIG. 8a. 1...Rotating axis, 2-5, 53, 62, 72, 84...
・Stator winding, -6, 51, 61, 87... Stator, 8, 42, 52, 64, 74, 83... Rotor field magnet, 12... Hall element, 14... DC power supply, 1
7.18... Comparator, 21.22... Transistor. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Claims for Utility Model Registration] (1) A stator having a stator winding of a plurality of short windings arranged in a plurality of slots at a pitch of 180 degrees in electrical angle, formed with magnetic pole widths of equal pitch. and has a thickness that varies in the direction facing the stator, and is configured such that the position of the maximum magnetic flux density of each magnetic pole is unevenly distributed closer to the magnetic neutral point than the center position of each magnetic pole. A rotor equipped with a field magnet, a magnetically sensitive element that detects the rotor position, and a magnetically sensitive element that is controlled by the detection signal of this magnetically sensitive element and supplies current in one direction to the stator winding.
In the brushless smoke equipped with switching elements, each of the switching elements is switched to conduction every 180° period during which the back electromotive force generated in the stator winding is maximum. motor. {2} The brushless motor according to claim 1, wherein the rotor smoothly changes the air gap in the direction in which magnetic flux passes or in the direction facing the stator at a predetermined shaft spacing of the rotor. (3) The brushless motor according to claim 1, wherein the axial direction of the field magnet of the rotor facing the stator is changed. (4) The brushless motor according to any one of claims 1 to 3, wherein the rotor is a multi-outer rotor.