Inverter system with hysteresis transition between pulse width m

Details Inverter system with hysteresis transition between pulse width m Inverter system with hysteresis transition between pulse width m

1985-01-14

1986-12-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 41, H02P 540

Patent

active

046267638

ABSTRACT:
Motor control apparatus for controlling the speed of a motor as a function of a variable frequency square wave and chopping pulses. The chopping pulses are cut off at some value greater than zero pulse width which causes motor voltage to increase in a step manner thus causing a feed forward voltage signal which is related to a DC rectified voltage which cooperates with the square wave production system to increase accordingly. A hysteresis circuit is provided within the pulse generating means to guarantee that once the pulse generation has stopped it will not increase again as a result of the aforementioned motor voltage rise.

REFERENCES:
patent: 3662247 (1972-05-01), Schieman
patent: 3919610 (1975-11-01), Gillett
patent: 4047083 (1977-09-01), Plunkett
patent: 4377779 (1983-03-01), Plunkett
patent: 4409535 (1983-10-01), Hickman
patent: 4419615 (1983-12-01), Muto et al.
Grant, D. A., "Technique for Pulse Dropping in Pulse-Width Modulated Inverters", IEE Proc., vol. 128, PtB, No. 1, Jan. 1981, pp. 67-72.

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