Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1982-01-12
1983-11-22
Smith, Jr., David
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 310156, H02K 2902
Patent
active
044171862
ABSTRACT:
A commutatorless electrical motor comprises a cylindrical magnetic rotor having main magnetic poles where N and S poles are alternately arranged in the circumferential direction, and an axis of N and S poles of each magnet extends radially, and a sub magnetic poles at one end of the cylindrical rotor. The sub magnetic poles are arranged such that N and S poles of each magnetized area extends axially. The magnetized area providing each sub magnetic pole has an arcuate extent of .pi./2 or less in an electrical angle. Each of the magnetized area providing each sub magnetic pole makes a given change in the magnetic flux density distribution in the vicinity of rotational position detecting elements so that the rotational position of the rotor can be accurately detected. As a result, current switching circuit for changing over armature currents will be controlled by the accurate information from the detecting elements, and thus each armature winding will be energized in a desirable manner, reducing undesirable torque ripple.
REFERENCES:
patent: 3883633 (1975-05-01), Kohler
patent: 4086519 (1978-04-01), Persson
patent: 4302692 (1981-11-01), Matsumoto et al.
Enami Ken
Hirose Yukimi
Wada Kinzo
Smith Jr. David
Victor Company of Japan , Limited
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