Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-10-15
1985-02-26
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 80, 310209, H02K 3700
Patent
active
045019819
ABSTRACT:
A linear stepper motor is provided with a feature to cause it to return to a zero position when current is cut off. The motor is formed of a stator armature assembly and a permanent magnet rotor assembly with poles thereof facing poles of the stator armature. The rotor assembly includes a rotor core formed as a nut with an axial threaded aperture extending therethrough. A shaft assembly includes a shaft screw mating with the rotor core nut, a front shaft affixed thereto, and a fixed sleeve overfitting the front shaft to permit axial motion thereof. A ball-and-groove arrangement in the front shaft and the sleeve prevents rotation of the shaft without impairing axial movement thereof. A spring causes return of the shaft to zero when there is no current applied to the stator armature. The spring can, for example, be a coil compression spring overfitting a portion of the shaft or a spiral torsion spring extending between the rotor and the stator armature.
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Haydon Switch & Instrument, Inc.
Robinson, Jr. Lee C.
Skudy R.
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