The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 2015
Filed:
Aug. 05, 2013
Applicant:
Microchip Technology Incorporated, Chandler, AZ (US);
Inventors:
Ward R. Brown, Chandler, AZ (US);
Howard F. Hendricks, Prescott, AZ (US);
Assignee:
MICROCHIP TECHNOLOGY INCORPORATED, Chandler, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 6/14 (2006.01); H02P 7/00 (2006.01); H02P 6/18 (2006.01);
U.S. Cl.
CPC ...
H02P 7/00 (2013.01); H02P 6/182 (2013.01); H02P 2209/07 (2013.01);
Abstract
A pulse width modulated (PWM) trapezoidal commutation drive to a brushless direct current (BLDC) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the BLDC motor. The values of the cosine of the angles between −30 degrees and +30 degrees are used to modify the duty cycle of the PWM drive signal dependent upon the rotor angular positions determined from the times between the zero crossing BEMF voltages measured at the unconnected motor terminals.