Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-08-23
1993-12-21
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, 310261, 318696, H02K 3714, H02K 3700
Patent
active
052724018
ABSTRACT:
Apparatus for improving the angular resolution of a stepping motor in which the effective step angle of the motor is reduced by a factor of two with no change in the nominal pitch angle. In one embodiment, a group of two stator laminations, angularly offset from one another, are used. In a second embodiment, two rotors, angularly offset from one another, are used, together with two non-offset stator stacks. In an alternative mode of the second embodiment, two stator stacks, angularly offset from one another, are used, together with two non-offset rotors. In a first mode of a third embodiment, a rotor having first and second rotor caps is laterally surrounded by first and second stators, and the two rotor caps, but not the two stators, are angularly offset from one another by the step angle. In a second mode of the third embodiment, the two stators, but not the two rotor caps, are angularly offset from one another by the step angle. In a fourth embodiment, the stator pitch angle is twice the rotor pitch angle so that the stator teeth are not aligned with more than half the rotor teeth at any time.
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patent: 4638195 (1987-01-01), Lin
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Haszko D. R.
Stephan Steven L.
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