ステツピングモ−タの固定子

Stator of stepping motor

Abstract

(57)【要約】 (修正有) 【目的】 インナ−ロ−タ型またはアウタ−ロ−タ型の ステッピングモ−タにおいて,トルクを増大させてもコ イル巻き作業が困難とならないようにした固定子の構造 を提供するもの。 【構成】 磁性薄板を打ち抜き積層して固定子とするタ イプのステッピングモ−タの固定子であって,コイルの 巻かれる主磁極の先端で有歯回転子とエアギャップを保 って対向する部分に3個以上の磁歯を有し,各主磁極の 磁歯のピッチθp(度)が等しいインナ−ロ−タ型のス テッピングモ−タの固定子において,上記3個以上の固 定子磁歯の内,両側の磁歯の歯幅をWbとし,それ以外 の磁歯の歯幅をWaとするとき,固定子の磁歯部内径を Dsとして (π・θp・Ds)/1440≦Wb<Wa なる関係を有するように形成した。この場合,上記関係 をアウタ−ロ−タ型のステッピングモ−タに適用しても 良い。
PURPOSE:To enable the coil of a stepping motor to be wound easily without reducing the torque of the motor, by denoting respectively the width of each magnetic tooth on both sides of each magnetic tooth part of the stator of the motor, which has the three or more magnetic teeth, as Wb, and the width of the magnetic tooth other than the two on both sides, as Wa, and the inner diameter of the magnetic tooth part of the stator as Ds, and by making them have the relation of the equation I. CONSTITUTION:The number of the magnetic teeth in each main magnetic pole of a stepping motor is three or more, and the width of each magnetic tooth on both sides of the main magnetic pole is denoted as Wb, the width of the magnetic tooth other than the two on both the sides as Wa, the inner diameter of the magnetic tooth as Ds, and the pitch of each magnetic tooth as - or + x (degree), respectively. When the width Wb, Wa of the magnetic teeth are so set as to satisfy an equation II, without reducing the torque of the motor, the width thetax of a slot can be kept large. When denoting respectively the number of the magnetic teeth in each main magnetic pole as n and the number of the main magnetic poles as N, the width of the slot is determined by an equation III, and as a result, the width thetax is determined by the width Wb of the magnetic tooth. Therefore, by finding the width Wb of the magnetic tooth, which is in the scope of giving a little reduction of the torque, the width thetax of the slot can be kept large without reducing the torque, and the insertion of the coil of the motor is made easy.

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