Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-08-06
1989-02-14
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, 318254, H02K 2108, H02K 1100, H02K 2908
Patent
active
048048739
ABSTRACT:
An inexpensive brushless motor including a single position detecting element can start itself and can rotate smoothly with good efficiency and reduced noise. The motor comprises a stator core having T-shaped radial stator poles with driving coils wound on all or some of the stator poles. A field magnet having driving alternate N and S magnetic pole zones is mounted for rotation in an opposing relationship to circumferential faces of the stator poles of the stator core. A cogging generating magnetic plate is located in an opposing relationship below the field magnet and has a cutaway portion formed therein which has a suitable angular width such that the magnetic plate may generate a cogging, to move the field magnet by attraction therebetween to a position other than any dead point, and from which the field magnet can start itself. The single position-detecting element is located such that it may detect no dead point upon starting of the motor.
REFERENCES:
patent: 4115715 (1978-09-01), Muller
patent: 4404484 (1983-09-01), Gillott
patent: 4620139 (1986-10-01), Egami et al.
patent: 4733119 (1988-03-01), Shiraki et al.
Patent Abstracts of Japan, vol. 9, No. 234 (E-344) [1957], Sep. 20, 1985 & JP-A-60 87 650 (Yoshiteru Takahashi) 05-17-1985.
Patent Abstracts of Japan, vol. 9, No. 266 (E-352) [1989], Oct. 13, 1985 & JP-A-60 113 646 (Yoshiteru Takahashi) 06-20-1985.
European Search Report EP 86 11 4618 & Annex to the European Search Report.
Miyao Osami
Shiraki Manabu
Rebsch D. L.
Salce Patrick R.
Shicoh Engineering Co. Ltd.
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