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. 01, 2022
Filed:
Dec. 04, 2019
Zhongshan Broad-ocean Motor Co., Ltd., Zhongshan, CN;
Jinghao Lan, Zhongshan, CN;
Wenqing Bian, Zhongshan, CN;
ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD., Zhongshan, CN;
Abstract
A method for controlling the start-up phase of a sensorless permanent magnet synchronous motor, the method including: 1) according to the formula T=K×Iq where T is a torque, K is a coefficient, and Iq is a current on a q-axis of a coordinate system of a motor mathematical model, based on a maximum output torque Tmax of a motor, calculating a maximum current Iq_max on the q-axis, setting the maximum current Iq_max as an upper limit of current on the q-axis, and controlling the motor to run in an open-loop control mode; and 2) when an actual running speed V of the motor reaches a first target speed V_ref, reducing the maximum current Iq_max to a target current Iqon the q-axis corresponding to a target torque Tset by users, and controlling the motor to run in a closed-loop control mode under the first target speed V_ref