Magnetization for brushless direct current outer rotor motor

Details Magnetization for brushless direct current outer rotor motor Magnetization for brushless direct current outer rotor motor

1983-01-14

1985-02-26

Witkowski, Stanley J.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

045019975

ABSTRACT:
A brushless direct current outer rotor-type motor having a substantially cylindrical air gap, particularly for driving magnetic storage discs, is provided. The rotor carries a permanent magnetic exciting magnet having at least two pole pairs and a permanent magnetic control magnet. One pole pair of the control magnet is asymmetrically constructed in such a way that the pole of one magnetizing direction is circumferentially shorter than the pole of the other magnetizing direction. The remaining control magnet pole pairs are symmetrical. Also provided are two substantially diametrically facing rotation position detectors cooperating with the control magnet along with an evaluation circuit subject to the action of the output signals thereof. Only one pulse is produced per rotor rotation from the evaluation circuit. The exciting and control magnets are identically magnetized, or the pole interface separating the poles of the asymmetrical pole pair either has an alignment diverging from the remaining pole interfaces or has a step-like or hook-shaped configuration.

REFERENCES:
patent: 3681669 (1972-08-01), Ayers
patent: 4217508 (1980-08-01), Uzuka
patent: 4286184 (1981-08-01), Kogler et al.
patent: 4430603 (1984-02-01), Muller

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