JPH0321976U

JPH0321976U -

Info

Publication number: JPH0321976U
Application number: JP8172989U
Authority: JP
Priority date: 1989-07-12
Filing date: 1989-07-12
Publication date: 1991-03-06

Description

[Brief explanation of the drawing]

第１図は本考案にかかる３相通電ブラシレスモ
ータに用いられる界磁マグネツトの実施例を示す
平面図、第２図は上記界磁マグネツトと駆動コイ
ルとを相対回転した場合に各コイルに誘起される
逆起電圧波形及びその合成された波形を示す線図
、第３図は本考案に適用可能な異極領域の形態の
別の例を示す平面図、第４図は異極領域の形態の
さらに別の例を示す平面図、第５図は異極領域の
形態のさらに別の例を示す平面図、第６図は異極
領域の形態のさらに別の例を示す平面図、第７図
は上記界磁マグネツトを得るための着磁ヘツドの
例を示す斜視図、第８図は従来一般のブラシレス
モータの例を示す正面断面図、第９図は従来の３
相通電ブラシレスモータに用いられる界磁マグネ
ツトの例を示す平面図、第１０図は同上界磁マグ
ネツトを用いた３相通電ブラシレスモータの１相
当たりの逆起電圧とトルク及び３相の合成トルク
の例を示す線図、第１１図は上記従来の界磁マグ
ネツトを得るための着磁ヘツドの例を示す斜視図
である。９，９ａ，９ｂ，９ｃ，９ｄ，９ｅ，９ｆ，９
ｇ，９ｈ，９……主極領域、１０ａ，１０ｂ，１
０ｃ，１０ｄ，１０ｅ，１０ｆ，１０ｇ，１０ｈ
，１１，１２，１３，１４……異極領域。 Fig. 1 is a plan view showing an embodiment of a field magnet used in a three-phase current-carrying brushless motor according to the present invention, and Fig. 2 shows the field magnet induced in each coil when the field magnet and drive coil are rotated relative to each other. Fig. 3 is a plan view showing another example of the form of the different polarity region applicable to the present invention, and Fig. 4 is a diagram showing the form of the different polarity region. FIG. 5 is a plan view showing yet another example of the form of the heteropolar region; FIG. 6 is a plan view showing yet another example of the form of the heteropolar region; FIG. 8 is a perspective view showing an example of a magnetizing head for obtaining the above-mentioned field magnet, FIG. 8 is a front sectional view showing an example of a conventional general brushless motor, and FIG.
FIG. 10 is a plan view showing an example of a field magnet used in a phase-conducting brushless motor. A diagram showing an example, FIG. 11 is a perspective view showing an example of a magnetizing head for obtaining the above-mentioned conventional field magnet. 9, 9a, 9b, 9c, 9d, 9e, 9f, 9
g, 9h, 9...main pole region, 10a, 10b, 1
0c, 10d, 10e, 10f, 10g, 10h
, 11, 12, 13, 14... different polar regions.

Claims

[Claims for Utility Model Registration] 1. In a three-phase brushless motor having a field magnet having 8n magnetic poles (an integer of n≧1) and 6n coils, the field magnet is formed with an electrical angle of 360 4n pairs of main pole regions forming a pair at ゜, and one adjacent 2 of the 4n pairs of main pole regions mentioned above.
The electrical angle of n pairs of main pole regions is 40° to 80° and 2
The electrical angle between the position corresponding to 20° and 260° and the other adjacent 2n pairs of main pole regions is 100° and 140°.
A three-phase energizing brushless motor characterized in that one different polarity region is provided at a part or all of positions corresponding to 280° and 280° to 320°. 2 The different polarity region is either a interpolated region magnetized with the opposite polarity to the main pole, an unsaturated region with the same polarity as the main pole, or a non-magnetized region that is not magnetized to either the S or N pole. A three-phase current-carrying brushless motor according to claim 1.