Speed control for a universal AC/DC motor

Details Speed control for a universal AC/DC motor Speed control for a universal AC/DC motor

1994-01-05

1996-02-27

Sircus, Brian

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, 318245, H01P 700

Patent

active

054951615

ABSTRACT:
A series universal AC/DC motor is controlled by switching the phase angle of an AC signal with a triac power switch in response to a motor control providing a phase-locked loop velocity control. A speed command circuit provides a reference frequency corresponding to a selected motor speed. The reference frequency is compared to a feedback frequency representing actual motor speed. An error signal representing the phase difference between the reference and feedback frequencies is compared to a ramp signal produced by the AC power source, and a resulting trigger pulse is used to control the triac power switch, thereby regulating the speed of the motor.

REFERENCES:
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patent: 4326153 (1982-04-01), Contri
patent: 4348625 (1982-09-01), Sharp
patent: 4412163 (1983-10-01), Angersbach
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patent: 4556830 (1985-12-01), Schwalm et al.
patent: 4622500 (1986-11-01), Budelman, Jr.
patent: 5189349 (1993-02-01), Haga
patent: 5223772 (1993-06-01), Carobolante
Motorola Semiconductor Technical Data Book, TDA1185A. pp. 4-7, and 4-125 to 4-133. no date.
Tal, Speed Control by Phase Locked Servo Systems, IEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI 24 No. 1 Feb. 1977 pp. 118-125.
Margaris et al., Phase Locked Speed Regulation of Universal Motors, Int. J. Electronics, 1983, vol. 55, No. 6 pp 843-850.

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