Hybrid type stepping motor

Details Hybrid type stepping motor Hybrid type stepping motor

1993-08-30

1995-04-25

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, H02K 3714

Patent

active

054102006

ABSTRACT:
A hybrid stepping motor in which each of two rotor yokes constituting a rotor is divided in its axial direction into at least two rotor yoke portions, the rotor yoke portions constituting one rotor yoke being made to abut on each other with their pole teeth shifted from each other in angular position by .theta..sub.0, the two rotor yoke portions belonging to the two rotor yokes respectively and sandwiching a permanent magnet therebetween being arranged with their pole teeth shifted from each other in angular position by 180/Nr degrees (.pi. radian in electric angle) under the condition that a relation of 0<.theta..sub.0 <90/Nr degrees is satisfied, and a rotor of a hybrid stepping motor in which two or more rotor units are arranged with their pole teeth shifted from each other in angular position by an angle smaller than 1/4 of the angular pitch with which the pole teeth are provided.

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Seventeenth Annual Symposium, Incremental Motion Control Systems and Devices, Jun. 1988, H. Dohmeki, et al., "Analysis of Harmonic Torque in Stepping Motor", pp. 225-231.

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