Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1983-01-21
1985-02-12
Shoop, William M.
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, 310156, 310187, H02K 2900
Patent
active
044994079
ABSTRACT:
The present invention is an improved brushless direct current (DC) motor for use in various applications, including disk drives in data processing applications. The improved motor includes a rotor portion, containing a ring magnet with alternately radially polarized zones, a shaft portion, a stator portion, having a stator stack, and conducting windings and power and control circuitry. The stator stack includes a plurality of poles, each pole having a greater amount of magnetic material at one end than the other end. The structure of the stator stack poles urges the rotor portion to detent positions from which it is magnetically driven to rotation upon application of winding current and further urges rotation upon current application regardless of rotor position. The improved motor provides an economical, reliable starting rotation motor which functions in an unimpeded fashion at normal operating speeds and is adaptable as a rotational motion source for a variety of applications.
REFERENCES:
patent: 2715690 (1955-08-01), Neuenshwander
patent: 4012651 (1977-03-01), Burson
patent: 4217508 (1980-08-01), Uzuka
patent: 4393339 (1983-07-01), Kimura
patent: 4429263 (1984-01-01), Muller
Applied Motion Products, Inc.
Hughes Michael J.
Ro Bentsu
Shoop William M.
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