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:
Feb. 02, 2021
Filed:
Jun. 25, 2019
Korea Electronics Technology Institute, Seongnam-si, KR;
Joonsung Park, Seoul, KR;
Junhyuk Choi, Bucheon-si, KR;
Jinhong Kim, Suwon-si, KR;
Byongjo Hyon, Anyang-si, KR;
Yongsu Noh, Bucheon-si, KR;
Dongmyoung Joo, Bucheon-si, KR;
KOREA ELECTRONICS TECHNOLOGY INSTITUTE, Seongnam-si, KR;
Abstract
The present disclosure provides a motor drive device and a motor drive system for improving a control stability despite an imbalance in zero crossing points in a sensorless motor of which position of a rotor is estimated by a counter electromotive force. The motor drive device includes: a position detector configured to detect a rotational position of a rotor of a motor by detecting a plurality of zero crossing points of a counter electromotive force induced in the motor; and a controller configured to control the motor by estimating a phase change timing based on a time interval between a current zero crossing point and a previous zero crossing point of a same state as the current zero crossing point among the plurality of zero crossing points detected by the position detector.