Sensorless control of two-phase brushless DC motor

Details Sensorless control of two-phase brushless DC motor Sensorless control of two-phase brushless DC motor

2007-02-27

2007-02-27

Ip, Paul (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S245000, C318S132000, C318S254100

Reexamination Certificate

active

11061794

ABSTRACT:
A motor control system for a two-phase brushless DC motor uses measured EMF voltage from the passive set of stator coils to control commutation. A microcontroller receives the EMF voltage measurement and compares it to a threshold voltage value, which may be speed-dependent for advance commutation at high motor speeds. A match of the EMF voltage measurement with the threshold value triggers commutation of the drive to the opposite set of stator coils. The microcontroller also has an up-down counter timer whose count value is compared to an external speed reference. Each match of the count value triggers a transition in a pulse-width modulated (PWM) drive signal. The duty cycle of the PWM signal establishes an average drive voltage that controls motor speed.

REFERENCES:
patent: 4928043 (1990-05-01), Plunkett
patent: 5017845 (1991-05-01), Carobolante et al.
patent: 5182499 (1993-01-01), Inaji et al.
patent: 5206567 (1993-04-01), Sakurai et al.
patent: 5343127 (1994-08-01), Maiocchi
patent: 5672948 (1997-09-01), Cohen et al.
patent: 5731670 (1998-03-01), Galbiati et al.
patent: 5783917 (1998-07-01), Takekawa
patent: 5886485 (1999-03-01), Jang
patent: 5998946 (1999-12-01), Kim
patent: 6018225 (2000-01-01), Garces
patent: 6163119 (2000-12-01), Jeong
patent: 6181093 (2001-01-01), Park et al.
patent: 6459230 (2002-10-01), Tao
patent: 6481974 (2002-11-01), Horng et al.
patent: 6483270 (2002-11-01), Miyazaki et al.
patent: 6940235 (2005-09-01), Getz et al.
patent: 6949900 (2005-09-01), Berringer
patent: 2002/0110457 (2002-08-01), Horng et al.
patent: 2003/0006724 (2003-01-01), Getz et al.
patent: 2003/0231875 (2003-12-01), Masino
patent: 2005/0002657 (2005-01-01), Wu et al.
patent: 2005/0047761 (2005-03-01), Babb et al.
patent: 2005/0110442 (2005-05-01), Trifilo
patent: 2005/0258789 (2005-11-01), Getz et al.
patent: 2005/0264250 (2005-12-01), Lee

Affiliated with

Also associated with

Rating

Sensorless control of two-phase brushless DC 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 Sensorless control of two-phase brushless DC motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensorless control of two-phase brushless DC motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3891359