JPH0318667U

JPH0318667U -

Info

Publication number: JPH0318667U
Application number: JP7879889U
Authority: JP
Priority date: 1989-07-04
Filing date: 1989-07-04
Publication date: 1991-02-25

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
施例を示す要部縦断面図、第２図ＡおよびＢは第
１図に示す磁心コアの製造例を示す分解図、第３
図はブラシレスモータの一般的な構成を示す縦断
面図、第４図はブラシレスモータの磁心コア、位
置検出素子および駆動マグネツトの位置関係を示
す図、第５図は従来のブラシレスモータを示す要
部縦断面図、第６図は第５図のブラシレスモータ
における駆動マグネツトからの磁路を説明する図
である。１……ステータ部材（固定シリンダ）、３……
中空部、７……ロータシヤフト、９……突極歯、
９ａ……特定の突極歯、１１……磁心コア、１１
ａ……第１の磁心コア、１１ｂ……第２の磁心コ
ア、１３……駆動コイル、１５……ロータヨーク
、１７……駆動マグネツト、１９……ステータ基
板、２１……ホール素子、２３……回転シリンダ
、３３……ロータ。 FIG. 1 is a longitudinal sectional view of essential parts showing an embodiment of the brushless motor according to the present invention, FIGS. 2A and B are exploded views showing an example of manufacturing the magnetic core shown in FIG. 1, and FIG.
The figure is a vertical cross-sectional view showing the general configuration of a brushless motor, Figure 4 is a diagram showing the positional relationship of the magnetic core, position detection element, and drive magnet of the brushless motor, and Figure 5 is a diagram showing the main parts of a conventional brushless motor. The vertical cross-sectional view of FIG. 6 is a diagram illustrating the magnetic path from the drive magnet in the brushless motor of FIG. 5. 1... Stator member (fixed cylinder), 3...
Hollow part, 7... rotor shaft, 9... salient pole tooth,
9a...Specific salient pole tooth, 11...Magnetic core, 11
a...First magnetic core, 11b...Second magnetic core, 13...Drive coil, 15...Rotor yoke, 17...Drive magnet, 19...Stator board, 21...Hall element, 23... Rotating cylinder, 33...rotor.

Claims

[Claims for Utility Model Registration] (1) A stator member, a stator board attached to the stator member, and a magnetic core attached to the stator member in parallel with the stator board and having a plurality of salient pole teeth. , a plurality of drive coils wound around the plurality of salient pole teeth, a rotor yoke rotatably supported by the stator member, and the rotor yoke facing the tips of the salient pole teeth with a slight interval therebetween. an annular drive magnet attached to the rotor yoke; a position detection element attached to the stator substrate so as to overlap with a tip of a specific salient pole tooth and detects a magnetic pole position of the drive magnet as the rotor yoke rotates; In the brushless motor, the tip of the specific salient pole tooth is formed thinner than the tip of the other salient pole teeth so as to form a space between it and the stator substrate. A brushless motor characterized by: (2) The magnetic core is formed by overlapping first and second magnetic cores, and the specific salient pole tooth tip portion of the second magnetic core located on the stator board side is missing. The brushless motor according to claim 1.