Controller for variable speed motor

Electricity: motive power systems – Induction motor systems – Primary circuit control

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Details

318254, 388804, 388811, H02P 517, H02P 528

Patent

active

059231459

ABSTRACT:
A controller controls the running speed of a variable speed motor of the type which runs at a speed related to the duty cycle of a pulse width modulated drive voltage applied to it and to the load being applied. The controller includes a setting switch for setting the motor running speed and a device for measuring the load being applied to the motor. Also included is a data storage for storing data representing a plurality of different pulse width modulation duty cycles for driving the motor at various desired motor running speeds and with various loads being applied to the motor. A processor is operatively connected to the setting switch, the load measuring device and the data storage for generating signals representing a particular duty cycle corresponding to a desired running speed setting and applied load to result in the desired motor speed. The processor generates these signals at a predetermined time interval to reach and maintain the desired motor speed. A voltage applying device is provided for applying the pulse width modulated voltage having the particular duty cycle to the motor.

REFERENCES:
patent: 4387421 (1983-06-01), Zach et al.
patent: 4843297 (1989-06-01), Landino et al.
patent: 5086862 (1992-02-01), Graber et al.
patent: 5254916 (1993-10-01), Hopkins
patent: 5447414 (1995-09-01), Nordby et al.
patent: 5498947 (1996-03-01), Wang et al.
patent: 5744921 (1998-04-01), Makaran
patent: 5777447 (1998-07-01), Okano

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