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:
Mar. 20, 2018
Filed:
Aug. 26, 2015
Shanghai Bright Power Semiconductor Co., Ltd., Shanghai, CN;
Jianhui Lin, Tianjin, CN;
Weixin Zhang, Tianjin, CN;
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai, CN;
Abstract
The present invention discloses a position-sensorless control method for a brushless motor, the method including: turning off a first driving voltage of a first phase coil, and within detection time, detecting a back electromotive force of the first phase coil; determining a reference phase and a cycle of a second driving voltage according to the back electromotive force; determining a pulse width modulation signal according to the reference phase and the cycle; and determining to provide the second driving voltage for the brushless motor according to the pulse width modulation signal, the second driving voltage being used to drive the brushless motor. The present invention effectively reduces the cost, decreases implementation difficulty and increases system performance and reliability.