Motor speed control using fixed-duration torque bursts

Details Motor speed control using fixed-duration torque bursts Motor speed control using fixed-duration torque bursts

1998-08-13

2000-03-07

Sircus, Brian

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, 318807, 388804, 3889281, H01R 3946

Patent

active

060344962

ABSTRACT:
A motor controller controls motor rotational speed by repeatedly executing a sequence of operations. Initially, a pulse is generated that causes a predetermined fixed current to be supplied to the motor winding for a predetermined driving interval. The winding current is forced to zero after the pulse has occurred. A settling interval is allowed to pass in which the back EMF across the motor winding stabilizes, and then the winding back EMF is compared to a velocity command voltage representing the desired rotational speed of the motor. If at the end of the settling interval the back EMF is less than the velocity command voltage, indicating that the motor speed is less than the desired speed, then a new control cycle is begun, starting with the assertion of the current-driving pulse. However, if the back EMF of the motor winding exceeds the velocity command voltage at the end of the settling interval, indicating that the motor speed is greater than the desired speed, then the controller continues to supply zero current to the motor winding while the motor velocity decays. This velocity decay interval ends when the back EMF no longer exceeds the velocity command voltage, at which time a new control cycle is begun.

REFERENCES:
patent: 3568027 (1971-03-01), Bacon et al.
patent: 4078194 (1978-03-01), Johnson, Jr.
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4350940 (1982-09-01), Dupont et al.
patent: 4489259 (1984-12-01), White et al.
patent: 4513231 (1985-04-01), Kuno et al.
patent: 4536809 (1985-08-01), Sidman
patent: 4724369 (1988-02-01), Hashimoto et al.
patent: 4749927 (1988-06-01), Rodal et al.
patent: 4812724 (1989-03-01), Langer et al.
patent: 4949201 (1990-08-01), Abed
patent: 4965848 (1990-10-01), Vasconi et al.
patent: 5005207 (1991-04-01), Grave et al.
patent: 5119250 (1992-06-01), Green et al.
patent: 5168398 (1992-12-01), Kanda et al.
patent: 5341453 (1994-08-01), Hill
patent: 5473725 (1995-12-01), Chen et al.
patent: 5543697 (1996-08-01), Carobolante et al.
patent: 5586306 (1996-12-01), Romano et al.
patent: 5631999 (1997-05-01), Dinsmore
patent: 5654840 (1997-08-01), Patton et al.
patent: 5659231 (1997-08-01), Svarovsky et al.
patent: 5672944 (1997-09-01), Gokhale et al.
patent: 5699207 (1997-12-01), Supino et al.

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