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. 23, 2019
Filed:
May. 26, 2017
Johnson Electric International Ag, Murten, CH;
Chi Ping Sun, Hong Kong, CN;
Fei Xin, Shen Zhen, CN;
Shing Hin Yeung, Hong Kong, CN;
Xiu Wen Yang, Shen Zhen, CN;
Shu Juan Huang, Shen Zhen, CN;
Yun Long Jiang, Shen Zhen, CN;
JOHNSON ELECTRIC INTERNATIONAL AG, Murten, CH;
Abstract
A motor driving circuit, the motor itself, and a motor driving method are disclosed. The circuit includes a controllable bidirectional alternating current (AC) switch and a processing unit, a voltage polarity of the AC power source and zero voltage crossing point of an AC power source being detected, together with a magnetic pole position of a permanent-magnet rotor, to govern the operation of the AC switch. When the controllable bidirectional AC switch is to be switched on, a trigger pulse is output after a delay time after the zero voltage crossing point, such that a phase difference between a back electromotive force and current flowing through the stator winding is decreased.