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:
Dec. 11, 2018
Filed:
Apr. 24, 2017
Ixys, Llc, Milpitas, CA (US);
Eric Arnold Hardt, San Jose, CA (US);
Thomas Andrew Ormiston, Tigard, OR (US);
IXYS, LLC, Milpitas, CA (US);
Abstract
A microcontroller controls a BLDC motor with Hall sensors. In a calibration mode, the microcontroller operates the motor at substantially constant load and speed. A first current value across the motor is detected. A reference phase angle value is adjusted and a second current value is detected. If the second current value is less than the first current value, then the reference phase angle value is adjusted and a next current value is detected. The adjusting and detecting is repeated until the next current value is greater than the previous current value indicating that the adjustment increased current across the motor. The adjusted reference phase angle value before increased motor current is stored. In a normal operating mode, using the adjusted reference phase angle value results in desired motor operation where minimal current is consumed for a given load and speed despite asymmetries in motor windings and Hall sensor placement.