Direct current torque motor with extended stator poles

Details Direct current torque motor with extended stator poles Direct current torque motor with extended stator poles

H - Electricity

02

K

H02K 26/00 (2006.01) H02K 1/14 (2006.01) H02K 33/00 (2006.01)

Patent

CA 2279814

A permanent magnet D.C. torque motor has the stator mounted in cantilever from a base and nested in a cup-shaped rotor journalled for rotation on the base. The permanent magnets are disposed about the inner periphery of the rotor. The stator core has a plurality of radially outwardly directed webs with coils therearound and may be formed integrally as one-piece or laminated. The pole segments may be integrally formed with the web or attached as separate members. The pole segments have truncated cylindrical pole shoe surfaces forming radial air gaps with the rotor magnets. The pole segments extend axially and transversely beyond the webs. The axial pole segment extensions provide increased total flux for a given motor volume without an increase in ampere turns of electrical energization. The motor of the present invention is particularly suitable as an engine air throttle actuator.

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