Closed loop torque angle control of synchronous motor

Details Closed loop torque angle control of synchronous motor Closed loop torque angle control of synchronous motor

1988-08-23

1989-11-28

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318661, 318563, G05B 1940

Patent

active

048840165

ABSTRACT:
A closed loop motor system having a motor with a plurality of poles and motor windings associated therewith. The poles define full step motor output positions. The system is of the type that assigns intermediated current values to the motor windings for fine step positions of the motor. The system also comprises a motor output position encoder for generating an integral and fixed number of encoder pulses as the motor moves between any two motor poles. The pulses are equally spaced and at least some corresponding to the fine step positions. An initializing current comprising components for applying full step current values to motor windings for a time interval in which the motor output is assumed to align with a full step position, and components for zeroing the count in the counter and assigning the torque angle value, whereby the encoder does not require alignment relative to the motor.

REFERENCES:
patent: 3585376 (1968-10-01), Toscano
patent: 4051419 (1977-09-01), Takahashi
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patent: 4426608 (1984-01-01), Larson et al.
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patent: 4518907 (1985-05-01), Giguere
patent: 4540925 (1985-09-01), Jones
patent: 4652806 (1987-03-01), Aiello
patent: 4761598 (1988-08-01), Lovrenich
"Trends Absolute Position Encoder", IBM Technical Disclosure Bulletin, vol. 30, No. 3, Aug. 1987, referred to as -IBM-and used in the plural.

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