Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-09-07
1996-04-23
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68B, 310 68R, 310 89, 310156, 310179, 310DIG6, H02K 122
Patent
active
055106641
ABSTRACT:
In a brushless motor, the number of coreless armature coils is set to 3n when the number of magnetic poles of a magnet for a magnetic field is set to 2n where n is a positive integer. An opening angle of each of the armature coils is set to 360/3n degrees. A notch portion is formed in an outer circumferential portion of the magnet for a magnetic field. A recessed portion is formed by this notch portion and an inner circumferential portion of a yoke. The recessed portion constitutes a groove for correcting a balance of each of the magnet for a magnetic field and a rotating body when this magnet and the rotating body are rotated. A motor housing and a harness are electrically connected to a printed board. The housing is connected to the ground through this harness and a harness for power. In this brushless motor, a magnetizing frequency is reduced and driving efficiency of a control circuit can improved when the brushless motor is rotated at a high speed. Further, it is possible to prevent an iron or copper loss from being caused so that an increase in temperature of the brushless motor can be restrained.
REFERENCES:
patent: 4072881 (1978-02-01), Ban
patent: 4737674 (1988-04-01), Miyao
patent: 4746827 (1988-05-01), Ochiai
patent: 5030864 (1991-07-01), Van Hout
patent: 5093593 (1992-03-01), Philipp
patent: 5289069 (1994-02-01), Hasegawa
Hashimoto Yoshio
Itami Yukio
Suzuki Mitsuo
Takahashi Yoshihiro
Yamamoto Mutsumi
Ricoh & Company, Ltd.
Skudy R.
Tohoku Richo Co., Ltd.
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