JPS63191872U

JPS63191872U -

Info

Publication number: JPS63191872U
Application number: JP7930687U
Authority: JP
Priority date: 1987-05-26
Filing date: 1987-05-26
Publication date: 1988-12-09

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に用いる回転子を示
す分解斜視図、第２図は同上の概略平面図、第３
図は同上の断面図、第４図は同上の動作説明図、
第５図は従来の回転子を示す分解斜視図、第６図
は他の従来の回転子の組立工程を示す分解斜視図
、第７図は同上の動作説明図である。１は回転子、２は固定子、３は磁気感応素子、
１１はヨーク、１２は永久磁石、１４は突起、２
１は鉄芯、２２はコイルである。 FIG. 1 is an exploded perspective view showing a rotor used in an embodiment of the present invention, FIG. 2 is a schematic plan view of the same, and FIG.
The figure is a cross-sectional view of the same as above, FIG. 4 is an explanatory diagram of the same as above,
FIG. 5 is an exploded perspective view showing a conventional rotor, FIG. 6 is an exploded perspective view showing the assembly process of another conventional rotor, and FIG. 7 is an explanatory view of the same operation. 1 is a rotor, 2 is a stator, 3 is a magnetic sensing element,
11 is a yoke, 12 is a permanent magnet, 14 is a protrusion, 2
1 is an iron core, and 22 is a coil.

Claims

[Scope of utility model registration request]

A stator is formed by winding a coil around an iron core and has at least two magnetic poles, and the stator is cylindrical and has magnetic poles that are alternately different in the circumferential direction, and the magnetic poles are opposite to the magnetic poles of the stator. a rotor that faces the magnetic poles of the rotor in the radial direction; a magnetically sensitive element that is fixed in a fixed position facing the magnetic poles of the rotor and detects the polarity of the magnetic poles of the rotor;
In a brushless motor consisting of a drive circuit that alternately switches the direction of energization to the coil based on the output of a magnetic sensing element, the rotor includes a yoke made of a magnetic material formed in a cylindrical shape, and A pair of permanent magnets that are magnetized and arranged so that one magnetic pole is in contact with the yoke so that the polarity is alternately different in the circumferential direction of the yoke, and each permanent magnet is adjacent to the other in the circumferential direction. A protrusion made of a magnetic material is formed integrally with the yoke at a position between the yoke and facing the magnetically sensitive element, and the protrusion has a width approximately equal to the spacing between the permanent magnets in the circumferential direction of the rotor, and the protrusion is rotated. A brushless electric motor in which the protruding height of the child in the radial direction is set to be approximately equal to the thickness of the permanent magnet.