Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-09-15
1982-08-31
Miller, J. D.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, 310 80, 74441, H02K 712
Patent
active
043474527
ABSTRACT:
A stator and a rotor of a step motor are disposed in an axially staggered relationship with each other so that the rotary shaft of the rotor can be freely displaced in the axial direction with respect to the stator. Around the outer periphery of the rotary shaft are formed screw threads so as to be threadedly engaged with a nut provided on a casing in which the stator of the step motor is fixedly mounted. Thereby the rotational displacement of the rotor can be converted into an axial displacement thereof, and thus a minute amount of desired controlled displacement can be realized with the influence of a backlash between the screw threads on the rotary shaft and the nut eliminated by an electromagnetic characteristic of the step motor.
REFERENCES:
patent: 2627040 (1953-01-01), Hansen
patent: 3278474 (1966-10-01), Roller et al.
patent: 4249426 (1981-02-01), Erikson et al.
Gutmann, F. T., "18 Ways to Control Backlash", Product Engineering, Oct. 26, 59, pp. 71-75.
Miller J. D.
Rebsch D. L.
Telmec Co., Ltd.
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