Device to regulate the speed of an electric motor and its method

Details Device to regulate the speed of an electric motor and its method Device to regulate the speed of an electric motor and its method

1993-06-21

1995-04-25

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318810, 318812, 318818, 388936, 388937, H02P 602

Patent

active

054102367

ABSTRACT:
Digital device to regulate the speed of an electric motor having a commutating element mounted in series with the motor at the terminals of an A.C. distribution network. A duration of an on-state of the commutating element defines values corresponding to desired reference speeds. The digital device includes a tachometer sensor connected with the motor which emits pulses indicative of the speed of the motor, a microcontroller having an oscillator, a first counter whose count is tied to at least one period of the pulses to calculate an actual speed of the motor, a memory containing desired reference speed values, a comparator to compare the desired reference speed with the actual speed of the motor, and an interface to control the on-state of the commutating element. The digital speed regulation is performed by calculating a range of correction defined as the difference between the reference speed chosen by the user and the first part of a value generated from the first counter, performing a test on the sign of the range of correction and, applying, using a second counter, a correction to the trigger of the commutating element as a function of the sign of the range of correction.

REFERENCES:
patent: 3570390 (1971-03-01), Jordan et al.
patent: 4130785 (1978-12-01), Penet
patent: 4387421 (1983-06-01), Zach et al.
patent: 4481457 (1984-11-01), Zach et al.
patent: 4855661 (1989-08-01), Okamoto
patent: 4926105 (1990-05-01), Mischenko et al.
patent: 5194794 (1993-03-01), Shamoto

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