JPH0182673U

JPH0182673U -

Info

Publication number: JPH0182673U
Application number: JP1987175963U
Authority: JP
Priority date: 1987-11-18
Filing date: 1987-11-18
Publication date: 1989-06-01

Description

【図面の簡単な説明】[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
施例を示す断面図、第２図は第１図中の駆動マグ
ネツトと磁心の配置を示す模式正面図、第３図は
第１図中の駆動マグネツトの各磁極によるコギン
グ力の推移特性および合成特性を示す図、第４図
は従来のブラシレスモータを示す断面図である。１，３…軸受部材（オイルレスメタル）、５…
軸受ケーシング、７…フランジ、９…回路基板、
１１…磁心、１３…突極、１３ａ…第１の突極、
１３ｂ…第２の突極、１５…駆動コイル、１７…
ロータシヤフト、１９…プーリ、２１…ロータヨ
ーク、２３…駆動マグネツト、２５…ロータ、２
７…位置検出素子（ホール素子）、３１…ねじ、
Ｕ２，Ｕ３，Ｕ４，Ｖ１，Ｖ３，Ｖ４，Ｗ１，Ｗ
２，Ｗ４…分割コイル。 FIG. 1 is a sectional view showing an embodiment of the brushless motor according to the present invention, FIG. 2 is a schematic front view showing the arrangement of the drive magnet and magnetic core in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a conventional brushless motor. 1, 3...Bearing member (oil-less metal), 5...
Bearing casing, 7... flange, 9... circuit board,
11... Magnetic core, 13... Salient pole, 13a... First salient pole,
13b...Second salient pole, 15...Drive coil, 17...
Rotor shaft, 19... Pulley, 21... Rotor yoke, 23... Drive magnet, 25... Rotor, 2
7... Position detection element (Hall element), 31... Screw,
U2, U3, U4, V1, V3, V4, W1, W
2, W4...Split coil.

Claims

【実用新案登録請求の範囲】軸受部材を有する軸受ケーシングと、この軸受ケーシングに取付けられた回路基板と
、この軸受ケーシングに支持され円周上に分布し
てスロツトが形成されるように放射状に延びる突
極を有する磁心と、前記突極に分割して巻かれた複数の駆動コイル
と、等間隔ピツチで相異なる磁極が交互に着磁され
前記突極の先端に対向する環状の駆動マグネツト
を有し、前記軸受部材に回転自在に軸支されたロ
ータと、前記磁心の近傍に前記駆動マグネツトと対向し
て前記回路基板に取付けられ、前記駆動マグネツ
トの所定磁極を検出して前記ロータの回転位置を
検出する位置検出素子と、を具備するブラシレスモータにおいて、前記磁心の前記突極が、前記駆動コイルの相数
に等数で前記円周上に等間隔で形成された第１の
突極と、隣合う前記第１の突極間の前記円周上に
等数づつ等間隔で形成された第２の突極とからな
り、前記第１の突極を挾むスロツトのピツチ角と
前記第２の突極を挾むスロツトのピツチ角とが相
異するように形成され、前記駆動コイルが前記第２の突極に分割して巻
かれ、前記位置検出素子が前記第１の突極近傍に位置
するように前記回路基板に取付けられ、てなることを特徴とするブラシレスモータ。[Claims for Utility Model Registration] A bearing casing having a bearing member, a circuit board attached to the bearing casing, and a circuit board supported by the bearing casing that extends radially so as to form slots distributed on the circumference. It has a magnetic core having a salient pole, a plurality of drive coils that are divided and wound around the salient pole, and an annular drive magnet that is alternately magnetized with different magnetic poles at equal pitches and faces the tips of the salient poles. a rotor that is rotatably supported by the bearing member; and a rotor that is attached to the circuit board near the magnetic core and facing the drive magnet, and detects a predetermined magnetic pole of the drive magnet to determine the rotational position of the rotor. and a position detection element that detects a brushless motor, wherein the salient poles of the magnetic core are first salient poles formed at equal intervals on the circumference in a number equal to the number of phases of the drive coil. , an equal number of second salient poles are formed at equal intervals on the circumference between adjacent first salient poles, and the pitch angle of the slot sandwiching the first salient poles and the second salient pole are The pitch angles of the slots sandwiching the two salient poles are formed to be different from each other, the drive coil is dividedly wound around the second salient pole, and the position detection element is located near the first salient pole. A brushless motor, which is attached to the circuit board so as to be located at a position.