Torque motor having uniform torque output characteristic

Details Torque motor having uniform torque output characteristic Torque motor having uniform torque output characteristic

1998-12-22

1999-12-21

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 36, 310 49R, H02K 3302, F02D 902

Patent

active

060053194

ABSTRACT:
A torque motor comprises a rotor having a pair of permanent magnet groups, and a pair of stator cores. Each magnet group includes a plurality of plate and rod-shaped permanent magnets arranged in a circumferential direction. The magnet groups are arranged asymmetrically with respect to a rotary axis of the rotor. That is, one magnet group is displaced one-half angle of the pitch angle of each permanent magnet from the symmetric position of the other magnet group with respect to the rotary axis of the rotor. Alternatively, the stator cores are arranged asymmetrically with respect to the rotary axis of the rotor so that a front end of one stator core is displaced from the symmetric position of a front end of the other stator core in the circumferential direction. A circular arc angle for one of the stator cores ends facing the rotor is greater than a circular arc angle for the other stator core facing the rotor. Accordingly, a range of a torque generating angle of the motor is increased.

REFERENCES:
patent: 4095129 (1978-06-01), Tanai et al.
patent: 4714851 (1987-12-01), Bertram et al.
patent: 4742259 (1988-05-01), Schaefer et al.
patent: 5016588 (1991-05-01), Pagdin
patent: 5705873 (1998-01-01), Sato

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