Direct current motor having a decreasing cogging torque

Details Direct current motor having a decreasing cogging torque Direct current motor having a decreasing cogging torque

1994-12-22

1997-03-11

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310258, H02K 2112, H02K 112

Patent

active

056104642

ABSTRACT:
In the direct current motor having Ns pieces of stator teeth and Nr pieces of magnetic poles, each of the plural magnetic poles is disposed shifted with the predetermined shift angles .DELTA..theta.i around a rotor from the angular reference position defined by even angles around the axis of the rotor, respectively, and the shift angles .DELTA..theta.i are defined by the below-mentioned expression concerning the least common multiple Nc between the Ns and the Nr;

REFERENCES:
patent: 3597646 (1971-08-01), Lawrenson
patent: 4303843 (1981-12-01), Arnoux et al.
patent: 4315171 (1982-02-01), Schaeffer
patent: 4424463 (1984-01-01), Musil
patent: 4516048 (1985-05-01), Brigham
patent: 4626781 (1986-12-01), Forkel
patent: 5444316 (1995-08-01), Ohya et al.

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