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:
Oct. 22, 2019
Filed:
Mar. 09, 2017
Ubtech Robotics Corp., Shenzhen, CN;
Youjun Xiong, Shenzhen, CN;
Wenhua Fan, Shenzhen, CN;
Lifu Zhang, Shenzhen, CN;
Jianyun Xiao, Shenzhen, CN;
UBTECH Robotics Corp., Shenzhen, CN;
Abstract
A method for measuring speed of a permanent magnet synchronous motor includes: acquiring a number K of pulse signals received in a current measuring period and outputted by an incremental encoder; acquiring a first duration Sbetween a time point when a pulse is last received in a previous measuring period and a time point when the previous measuring period ends, and a second duration Sbetween a time point when a pulse is last received in the current measuring period and a time point when the current measuring period ends; calculating a third duration T, measured between the time point when the pulse is last received in the previous measuring period and the time point when the pulse is last received in the current measuring period, according to the length T of the current, measuring period, the first duration Sand the second duration S; and calculating a motor speed v according to formula: