DC torque motor, and drive control apparatus and throttle valve

Electrical generator or motor structure – Dynamoelectric – Oscillating

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310254, 318119, H02K 3300

Patent

active

06153952&

ABSTRACT:
A small-sized, light-weight DC torque motor with good response characteristics. The motor is a moving magnet type DC torque motor rockable in a rocking angle of 0=45 to 135 degrees. The motor includes a stator with a coil wound around a portion thereof, the stator having a generally U-shape and having end portions facing each other and having magnetic pole sections arranged thereon; and a needle surrounded by the end portions of the stator, being rotatably supported, and including permanent magnets attached thereto; so that the needle can be rocked within a predetermined working angle range; a portion of the stator has a section area A smaller than that of the magnetic pole sections, the stator is formed of a material having a saturation magnetic flux density B, and the section area A satisfies the condition that the product of A and B is smaller than the sum of (i) a magnetic flux quantity which occurs when an electric current flows in the coil and (ii) a maximum permanent magnetic flux quantity generated by the permanent magnets within the working angle range

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patent: 5742106 (1998-04-01), Muraji
patent: 5753985 (1998-05-01), Redlich
patent: 5927249 (1999-07-01), Ackermann et al.

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