JPH0340874U

JPH0340874U -

Info

Publication number: JPH0340874U
Application number: JP9929889U
Authority: JP
Priority date: 1989-08-25
Filing date: 1989-08-25
Publication date: 1991-04-19

Description

[Brief explanation of drawings]

第１図は、本考案の一実施例を示す縦断面図、
第２図は、その要部分解斜視図、第３図は、従来
例を示す縦断面図、第４図は、その要部分解斜視
図である。１……回転子、２……回転子軸、３……磁性ヨ
ーク、４……永久磁石、５……固定子、６……磁
極子、７……絶縁部材、８……コイル、９……ハ
ウジング、１０……軸受、１１……軸受台、１２
……軸受、１３……検知部ハウジング、１４……
位置検知用磁石、１５……磁気感応素子、１９…
…信号線、２６……結線用基板、２６ａ……基部
、２６ｂ……磁束集束部、２６ｃ……ねじ貫通孔
、２６ｄ……取付ねじ。 FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is an exploded perspective view of the main part thereof, FIG. 3 is a vertical sectional view showing a conventional example, and FIG. 4 is an exploded perspective view of the main part. DESCRIPTION OF SYMBOLS 1... Rotor, 2... Rotor shaft, 3... Magnetic yoke, 4... Permanent magnet, 5... Stator, 6... Magnetic pole piece, 7... Insulating member, 8... Coil, 9... ...Housing, 10...Bearing, 11...Bearing stand, 12
... Bearing, 13 ... Detector housing, 14 ...
Position detection magnet, 15... Magnetic sensing element, 19...
...Signal line, 26... Connection board, 26a... Base, 26b... Magnetic flux focusing section, 26c... Screw through hole, 26d... Mounting screw.

Claims

[Scope of Claim for Utility Model Registration] A rotor in which a magnetic sleeve is fixed to the rotor shaft, and permanent magnets with different poles alternately located in the circumferential direction are arranged on the outer periphery of the magnetic sleeve, and the outer periphery of the rotor is cylindrical. The stator is surrounded by a stator with a plurality of magnetic poles protruding toward the outer peripheral surface of the rotor, and a coil is wound around the magnetic poles via an insulating member, and the permanent magnets of the rotor are separate bodies. The magnet includes a position detection magnet fixed to the rotor shaft and housed in the detection unit housing, and a plurality of magnetic sensing elements provided on the wiring board so as to face the outer peripheral surface of the position detection magnet. In a brushless electric motor that controls energization of the coil by a drive circuit that receives a detection signal from a sensing element, the wiring board is formed of a magnetic plate, and
A brushless electric motor in which a magnetic flux concentrator located on the back side of a magnetic sensing element is connected to a base, and the base is attached to the detection housing so as to close the opening of the housing.