Control apparatus for brush-less motor

Details Control apparatus for brush-less motor Control apparatus for brush-less motor

1988-05-23

1989-02-28

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318723, H02P 540

Patent

active

048089028

ABSTRACT:
Disclosed is a control apparatus for a brush-less motor, which can prevent commutation failure of an inverter for driving the motor. The control apparatus, according to the invention detects a counter EMF of the motor, and the detected counter EMF is applied to a PLL circuit. In the course of normal operation of the motor, an output of the PLL circuit is used for controlling the advanced control angle of a motor drive inverter. Any abnormality in the condition of the motor, such as that arising from an abrupt change in load of the motor, causes a sudden and substantial variation in the magnitude and phase of the counter EMF. Since the internal condition of the PLL circuit changes in response to this counter EMF variation, a signal generated by the PLL circuit is therefore used to detect the counter EMF variation. This internal signal is compared with a predetermined limit level, and when its signal level is found to exceed this limit level, operation of the motor drive inverter is stopped, whereby commutation failure of the inverter is prevented.

REFERENCES:
patent: 4255693 (1981-03-01), Keidl
patent: 4275343 (1981-06-01), Fulton et al.
patent: 4409533 (1983-10-01), Kawbata
patent: 4427934 (1984-01-01), Tupper
patent: 4469998 (1984-09-01), Nola

Affiliated with

Also associated with

Rating

Control apparatus for brush-less motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control apparatus for brush-less motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control apparatus for brush-less motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1370470