Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-08-28
1998-08-11
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310217, 310211, 310179, 310259, H02K 100
Patent
active
057931399
ABSTRACT:
An electric motor generates a large torque despite its small size, causes small torque ripples, and is able to perform field-weakening control when the number of revolutions is large. The electric motor comprises a stator having m portions where large magnetic resistance and small magnetic resistance exist in the radial direction around the entire circumference, and a rotor having n portions where large magnetic resistance and small magnetic resistance exist in the radial direction around the entire circumference. The value .vertline.m-n.vertline. is an integer less than 3, m and n are large numbers. The stator is provided with two-pole, multi-phase stator windings. The structure such that the salient poles of the stator and rotor are shifted slightly from each other enables the motor to generate large torque and cause only small torque ripples.
REFERENCES:
patent: 4801832 (1989-01-01), Neumann
patent: 5233253 (1993-08-01), Nishio et al.
Okuma Corporation
Stephan Steven L.
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