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:
Apr. 10, 2012
Filed:
Dec. 04, 2008
Chia-tai Yang, Tainan, TW;
Ching-sheng LI, Hsinchu County, TW;
Kun-min Chen, Changhua County, TW;
Tzu-cheng Teng, Taipei, TW;
Chia-Tai Yang, Tainan, TW;
Ching-Sheng Li, Hsinchu County, TW;
Kun-Min Chen, Changhua County, TW;
Tzu-Cheng Teng, Taipei, TW;
Anpec Electronics Corporation, Hsinchu Science Park, Hsin-Chu, TW;
Abstract
A sensorless method for starting a three-phase brushless direct-current motor includes generating a start-up control signal, a start mode selection signal, and a control signal commutation period; switching to a start mode according to the start mode selection signal; implementing a position aligning procedure according to the start-up control signal and the control signal commutation period; detecting a zero crossing point of back electromotive forces during each control signal commutation period; outputting a sensorless mode selection signal while detecting the zero crossing points of the back electromotive forces during consecutive control signal commutation periods; switching to a sensorless mode according to the sensorless mode selection signal; and detecting a zero crossing point of back electromotive forces in the sensorless mode to determine a starting result of the three-phase brushless direct-current motor.