Three-phase brushless motor

Details Three-phase brushless motor Three-phase brushless motor

1986-01-24

1987-01-27

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 310 68R, H02K 2908

Patent

active

046396489

ABSTRACT:
A three-phase brushless motor in which two electromagnetic transducer elements for detecting the rotational position of a rotor are disposed so as to produce a composite signal having a phase difference of 120.degree. relative to the output signals from the electromagnetic transducer elements, and the output signals from the two electromagnetic transducer elements and the composite signal are used to determine drive currents fed to the stator coils. The rotor includes auxiliary magnetic poles having opposite polarities to those of main magnetic poles and are disposed in the rotor opposite the electromagnetic transducer elements at positions with an electrical angle of .+-.45.degree. from the boundary between respective North poles and South poles of the main magnetic poles, whereby waveforms of the composite signal and the output signals from the electromagnetic transducer elements have a steep slope at zero crossing points.

REFERENCES:
patent: 4260920 (1981-04-01), Nakamura et al.
patent: 4578606 (1986-03-01), Welterlin
patent: 4585979 (1986-04-01), Sakamoto et al.

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