JPH0480278U

JPH0480278U -

Info

Publication number: JPH0480278U
Application number: JP12329190U
Authority: JP
Priority date: 1990-11-21
Filing date: 1990-11-21
Publication date: 1992-07-13

Description

[Brief explanation of the drawing]

第１図は、本発明の一実施例を示す分解斜視図
、第２図は、その縦断面図、第３図は、その横断
面図、第４図は、その要部斜視図、第５図は、従
来例の分解斜視図、第６図は、その横断面図であ
る。第７図は、その要部拡大図である。１……回転子、２……回転子軸、３……永久磁
石、４……固定子、５……固定子鉄心、５ａ……
円筒部、５ｂ……左右対称の磁極子、５ｃ……左
右非対称の磁極子、５ｄ……欠極部、５ｅ……外
周面、５ｆ……凹所、６……絶縁部材、７……コ
イル、８……固定枠、８ｂ……対称片、８ｃ……
非対称片、８ｄ，８ｆ……周壁部、８ｅ，８ｇ…
…嵌入突部、８ｈ……代用極部、９……モータケ
ース、１０，１１……ブラケツト、１２，１３…
…軸受、１４……磁気感応素子。 FIG. 1 is an exploded perspective view showing one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view thereof, FIG. 3 is a cross-sectional view thereof, FIG. The figure is an exploded perspective view of a conventional example, and FIG. 6 is a cross-sectional view thereof. FIG. 7 is an enlarged view of the main part. 1... Rotor, 2... Rotor shaft, 3... Permanent magnet, 4... Stator, 5... Stator core, 5a...
Cylindrical part, 5b... Left-right symmetrical magnetic pole piece, 5c... Left-right asymmetrical magnetic pole piece, 5d... Missing pole part, 5e... Outer peripheral surface, 5f... Recess, 6... Insulating member, 7... Coil , 8... Fixed frame, 8b... Symmetrical piece, 8c...
Asymmetric pieces, 8d, 8f...peripheral wall parts, 8e, 8g...
... Fitting protrusion, 8h... Substitute pole part, 9... Motor case, 10, 11... Bracket, 12, 13...
...bearing, 14...magnetic sensing element.

Claims

[Claims for Utility Model Registration] A rotor in which permanent magnets are arranged on the rotor shaft so that different poles are positioned alternately in the circumferential direction, and the permanent magnets are surrounded by a cylindrical outer periphery and have symmetrical tips. A stator core consisting of a stator core in which a magnetic pole piece that spreads outwardly and a magnetic pole piece that spreads asymmetrically protrudes toward the outer peripheral surface of a permanent magnet, a coil wound around the magnetic pole piece via an insulating member, and a bearing. A bracket is installed at both axial ends of the stator core, a magnetic sensing element is installed on one bracket to face the outer peripheral surface of the permanent magnet, and the coil is activated by the detection output of the magnetic sensing element. In a brushless electric motor having a drive circuit for controlling energization to the stator core, a recess is formed in the outer circumferential surface of the stator core, and a circumferential wall portion having an inner diameter substantially the same as the inner circumferential surface of the magnetic pole piece, and a concave portion formed from the circumferential wall portion. An insulating fixing frame is provided, which is made up of a substitute pole part that supplements the continuous missing pole part and a fitting protrusion that is fitted into the recess. A brushless electric motor attached to both ends.