Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2011-06-21
2011-06-21
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400310, C318S701000
Reexamination Certificate
active
07965053
ABSTRACT:
A method for determining the speed of rotation of an unpowered, coasting electric motor, driven, when powered, by an electronic inverter, and without activating switches of the inverter. The steps include determining an electrical frequency of a back emf signal generated at a terminal of the motor or switching node of the inverter when the motor is coasting and determining the mechanical motor frequency and thus speed of rotation by dividing the electrical frequency by the number of motor pole pairs.
REFERENCES:
patent: 4761703 (1988-08-01), Kliman et al.
patent: 5051680 (1991-09-01), Belanger
patent: 5327053 (1994-07-01), Mann et al.
patent: 5334917 (1994-08-01), Lind
patent: 5521482 (1996-05-01), Lang et al.
patent: 5530343 (1996-06-01), Bowers et al.
patent: 5534763 (1996-07-01), Williams et al.
patent: 5563980 (1996-10-01), Chen et al.
patent: 6034493 (2000-03-01), Boyd et al.
patent: 6104113 (2000-08-01), Beifus
patent: 6359413 (2002-03-01), Schulz et al.
patent: 6555977 (2003-04-01), Du et al.
patent: 7030582 (2006-04-01), Masino
patent: 7126301 (2006-10-01), Nishihara et al.
patent: 7138776 (2006-11-01), Gauthier et al.
patent: 7141949 (2006-11-01), Harwood
patent: 2006/0197482 (2006-09-01), Harwood
patent: 2007/0282461 (2007-12-01), Harwood
patent: 2008/0211450 (2008-09-01), Yamada et al.
Simon, Neil, “Determining speed for AC induction motors,” A.O. Smith Electrical Products Company, 2004.
Borisavljevic, Ana et al, “Fan Drive Starting into Naturally Rotating Load by Sinusoidal Sensorless Permanent Magnet Motor Control,” EPE-PEMC 2006 Portoroz, Slovenia, pp. 1190-1198.
Bimal Bose, “Power Electronics and Variable Frequency Drives,” IEEE Computer Society Press, Oct. 1996, pp. 235-307.
“Permanent Magnet Synchronous Machine,” Mathworks: SimPowerSystems library for Siumlink.
Farjami & Farjami LLP
International Rectifier Corporation
Ip Paul
LandOfFree
Measurement of speed and direction of coasting permanent... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measurement of speed and direction of coasting permanent..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of speed and direction of coasting permanent... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2717705