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:
Jun. 05, 2018
Filed:
Dec. 16, 2013
Direct-axis current protection method and device for permanent magnet synchronous motor drive system
Csr Zhuzhou Electric Locomotive Research Institute Co., Ltd., Zhuzhou, Hunan, CN;
Jianghua Feng, Hunan, CN;
Kean Liu, Hunan, CN;
Junfeng Xu, Hunan, CN;
Yaping He, Hunan, CN;
Yuliang Wen, Hunan, CN;
Jing Shang, Hunan, CN;
Chaoyang Zhang, Hunan, CN;
Xiong Liu, Hunan, CN;
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO., LTD., Zhuzhou, Hunan, CN;
Abstract
A direct-axis current protection method and device for a permanent magnet synchronous motor drive system. The method includes: pre-calculating the direct-axis current of the next moment according to the current voltage transmitted from an inverter to a permanent magnet synchronous motor (PMSM); comparing the direct-axis current of the next moment with a maximum protection current; if the direct-axis current of the next moment is less than the maximum protection current, continuing transmitting the current voltage to the PMSM; if the direct axis current of the next moment is greater than or equal to the maximum protection current, redistributing the voltage according to a protection direct-axis current and a protection quadrature-axis current, and transmitting the redistributed voltage to the PMSM. The direct-axis current of the next moment is tended to be normal by adjusting the voltage.