JPH0314966U

JPH0314966U -

Info

Publication number: JPH0314966U
Application number: JP7421089U
Authority: JP
Priority date: 1989-06-23
Filing date: 1989-06-23
Publication date: 1991-02-14

Description

[Brief explanation of drawings]

本考案に係る第１実施例を第１図〜第７図に示
し、第１図は概略縦断面図、第２図は第１図にお
けるシヤフトに取付けられた主な部材の概略図、
第３図は第２図における−矢視図、第４図は
第２図における−矢視図、第５図及び第６図
はセンサマグネツトの態様例を示す図、第７図は
ロータとステータとの位置関係図である。第８図
は本考案に係るロータの円周方向の磁束分布を示
す図であり、第９図は従来技術に係るロータを分
割して着磁したロータの円周方向における磁束分
布を示す図であり、第１０図は従来技術に係るロ
ータを円筒形状のままでの着磁したロータの円周
方向の磁束分布を示す図である。２……モータハウジング、６……シヤフト、１
６……ロータ、１８……ステータ、１９……コイ
ル、２６，１２６……センサマグネツト。 A first embodiment according to the present invention is shown in FIGS. 1 to 7, where FIG. 1 is a schematic longitudinal sectional view, and FIG. 2 is a schematic diagram of the main members attached to the shaft in FIG. 1.
FIG. 3 is a view from the - arrow in FIG. 2, FIG. 4 is a view from the - arrow in FIG. FIG. 3 is a positional relationship diagram with a stator. Fig. 8 is a diagram showing the magnetic flux distribution in the circumferential direction of the rotor according to the present invention, and Fig. 9 is a diagram showing the magnetic flux distribution in the circumferential direction of the rotor according to the prior art, which is obtained by dividing and magnetizing the rotor. FIG. 10 is a diagram showing the magnetic flux distribution in the circumferential direction of a rotor according to the prior art, which is magnetized in a cylindrical shape. 2...Motor housing, 6...Shaft, 1
6... Rotor, 18... Stator, 19... Coil, 26, 126... Sensor magnet.

Claims

[Claims for Utility Model Registration] A brushless motor having a rotor placed within a stator fixed to the inner periphery of a motor housing, the rotor having individually magnetized permanent magnet pieces arranged around the shaft of the motor. They are arranged adjacent to each other, and the shape of the portion of the permanent magnet pieces that constitutes the outer contour of the rotor is such that, in a cross section perpendicular to the shaft of the motor, the intermediate portion forms a circle centered on the shaft of the motor. A brushless motor, which is located on the circumference and has an end curved inward from the intermediate portion of the circle.