Method and apparatus for controlling the speed of a single phase

Details Method and apparatus for controlling the speed of a single phase Method and apparatus for controlling the speed of a single phase

1993-10-15

1995-06-06

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318779, H02P 742

Patent

active

054225574

ABSTRACT:
A method for controlling speed of a single phase induction motor using frequency variation, including the steps of generating an operation start signal and a speed command signal according to a user's selection, outputting a digital data for formation of a sinusoidal wave signal of a desired frequency, to converting means at an interval of a predetermined time period set by a timer to thereby generate the sinusoidal wave signal of the frequency desired by the user, generating the sinusoidal wave based on the digital data, comparing the sinusoidal wave with a triangular signal for controlling a speed of a motor, and converting a DC voltage from a power source into an AC voltage of a frequency band desired by the user to thereby operate the motor. An apparatus for controlling the speed of a single phase induction motor is also provided.

REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4477763 (1984-10-01), Asano et al.
patent: 4480299 (1984-10-01), Muto et al.
patent: 4617675 (1986-10-01), Ashikaga et al.
patent: 4758938 (1988-07-01), Kanazawa
patent: 5121043 (1992-06-01), Kerkman et al.
patent: 5170110 (1992-12-01), Vlasak
patent: 5187654 (1993-02-01), Felippe
patent: 5218283 (1993-06-01), Wills et al.
patent: 5278486 (1994-01-01), Kim

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