Motor speed control with current limit

Electricity: motive power systems – Limitation of motor load – current – torque or force

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

318254, 388813, 388815, 388911, 330118, H02K 1732

Patent

active

055720994

ABSTRACT:
A phase-locked loop (or frequency-locked loop) based circuit for controlling the drive applied to a DC polyphase motor is disclosed. The disclosed circuit includes a clamp circuit, connected to the input of the motor drive amplifier, for limiting the current applied to the drive amplifier, in order to ensure that the power supply is not overloaded. According to one embodiment of the invention, the clamp circuit includes a buffer amplifier having a source leg and a sink leg. During a current control mode, both the source leg and sink leg of the buffer amplifier are enabled to drive the input of the motor drive amplifier; the buffer amplifier is a differential amplifier and applies a feedback signal from the drive amplifier input to control the current applied thereto according to an input limit signal. In a speed control mode, a PLL/FLL circuit controls the drive to the motor drive amplifier, and the source leg of the buffer amplifier is disabled; the sink leg remains enabled, however, so that the current continues to be limited in the speed control mode. According to another embodiment of the invention, a series switch is used to switch the input of the drive amplifier from the buffer amplifier to the PLL/FLL circuit upon switching from current control mode to speed control mode.

REFERENCES:
patent: 3868554 (1975-02-01), Konrad
patent: 4177434 (1979-12-01), Ida
patent: 4246622 (1981-01-01), Hosoda et al.
patent: 4277710 (1981-07-01), Harwood et al.
patent: 4331263 (1982-05-01), Brown
patent: 4381478 (1983-04-01), Saijo et al.
patent: 4457639 (1984-07-01), Nagai
patent: 5047675 (1991-09-01), Cerato et al.
patent: 5154242 (1992-10-01), Soshin et al.
patent: 5202614 (1993-04-01), Peters et al.
patent: 5202616 (1993-04-01), Peters et al.
patent: 5258696 (1993-11-01), Le
patent: 5293445 (1994-03-01), Carobolante
patent: 5306988 (1994-04-01), Carobolante et al.
patent: 5319289 (1994-06-01), Austin et al.
patent: 5329560 (1994-07-01), Rastegar et al.
patent: 5343127 (1994-08-01), Maiocchi
IEEE Transactions on Consumer Electronics, vol. 35, No. 3, Aug. 1989, "A Full-Wave Motor Drive IC Based on the Back-EMF Sensing Principle", Bahlmann, pp. 415-420.
Electronic Components and Applications, vol. 10, No. 3 "Full-Wave Sensorless drive ICs for brushless DC Motors", Dominique Pouilloux, pp. 2-11, Dec. 1994.
Proceedings of the Conference on Drives/Motors/Controls 1984, Paraskeva et al. "Microprocessor Control of a brushless D.C. Motor".

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Motor speed control with current limit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor speed control with current limit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor speed control with current limit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2016954

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.