Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-08-29
1990-05-01
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 62, 310 68B, 310 90, 310156, 310193, 310254, 310DIG6, 318254, H02K 122
Patent
active
049221620
ABSTRACT:
A disk-type single-phase brushless motor wherein a reluctance torque having a sufficient magnitude can be generated to assure self-starting and continued rotation of the motor and production of disagreeable noises is minimized. The motor comprises a stator yoke mounted in an opposing relationship to a magnet rotor with an axial air gap left therebetween. The magnet rotor has an equal circumferential pole width .theta.. The stator yoke has a cutaway portion formed therein for enabling self-starting of the motor. The cutaway portion has a specific shape including a first radially extending edge and a second edge extending in a predetermined angular relationship from an inner end of the first edge to an outer circumferential edge of the stator yoke. The stator yoke is positioned at a predetermined angular position relative to a coreless armature coil so that the first edge thereof may be angularly spaced by a predetermined angle from a position at which a maximum starting torque is produced in the direction opposite the direction of rotation of the rotor.
REFERENCES:
patent: 4620139 (1986-10-01), Egami et al.
patent: 4682065 (1987-07-01), English et al.
patent: 4724350 (1988-02-01), Shiraki et al.
patent: 4725752 (1988-02-01), Shiraki et al.
patent: 4728833 (1988-03-01), Shiraki et al.
patent: 4733119 (1988-03-01), Shiraki et al.
patent: 4757222 (1988-07-01), Shiraki et al.
Ishii Sumio
Shiraki Manabu
Shicoh Engineering Co. Ltd.
Skudy R.
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