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. 05, 2017
Filed:
Mar. 03, 2015
Crrc Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou, Hunan, CN;
Jianghua Feng, Hunan, CN;
Kean Liu, Hunan, CN;
Jing Shang, Hunan, CN;
Junfeng Xu, Hunan, CN;
Lei Xiao, Hunan, CN;
Chaoyang Zhang, Hunan, CN;
Yuliang Wen, Hunan, CN;
Yaping He, Hunan, CN;
Xiong Liu, Hunan, CN;
CRRC ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO., LTD., Zhuzhou, Hunan, CN;
Abstract
A method and device for acquiring a rotor position based on a permanent magnet synchronous drive system. The permanent magnet synchronous drive system includes an inverter and a permanent magnet synchronous motor, wherein the initial speed of the permanent magnet synchronous motor is not zero. The method includes: controlling a bridge arm switch of an inverter periodically; collecting a three-phase current of the permanent magnet synchronous motor at a fixed time within each control period; and after the three-phase current is reversed, sending same to a phase-locked loop system to conduct processing, so as to obtain a phase angle of an induction potential vector, and according to the phase angle of the induction potential vector, acquiring a rotor position angle of the permanent magnet synchronous motor.