Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1980-05-06
1982-11-30
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Power-factor control
318799, 318798, H02P 540
Patent
active
043617921
ABSTRACT:
A digital self-calibrating power factor controller for an AC induction motor. During start-up a first number corresponding to the actual phase angle between motor voltage and current is determined and compared with a second number corresponding to a desired delay in energizing the motor. The second number is varied until both numbers are approximately equal. A third number corresponding to a desired phase angle is determined and stored and the system switches from start-up to run. The first number corresponding to the actual phase angle is now compared with the third number corresponding to the desired phase angle. The second number corresponding to a desired delay is now varied with motor load so as to keep the actual phase angle equal to the desired phase angle.
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Jackson et al., "Direct Digital Control of Thyristor Convertors", IFAC Symposium on Control and Power Electronics & Electrical Devices, Oct. 1974, vol. I, pp. 431-441.
Becker Richard J.
Davis, Jr. Ray E.
Foster Robert G.
Johnson Richard H.
Timothy Earle J.
Chesebrough-Pond's Inc.
Smith Jr. David
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