Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1989-07-13
1991-01-15
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318254, 310 49R, H02P 800
Patent
active
049856693
ABSTRACT:
A multi-phase stepper motor in which one or more salient sensor poles and corresponding pick-up windings are employed to sense the actual position of the rotor. The rotor is of annular configuration and includes a first set of nonsalient rotor poles around its outer periphery and a second set of nonsalient rotor poles around its inner periphery, with the outer rotor poles being in magnetic flux relationship with the motor's stator poles and the inner rotor poles being in magnetic flux relationship with the sensor poles. A cylindrical housing of magnetic material surrounds the motor. An energizing circuit is provided to apply successive direct current pulses to the stator windings of the motor, and the pick-up windings are connected in a feedback circuit to adjust the applied pulses in accordance with the desired position of the rotor.
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Ro Bentsu
Tri-Tech Inc.
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