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:
Aug. 27, 2024
Filed:
Aug. 21, 2023
Kinetic Technologies International Holdings Lp, Toronto, CA;
Kwei Chung Li, Kowloon, HK;
Kinetic Technologies International Holdings LP, Toronto, CA;
Abstract
A method of switching from a closed-loop start-up method to a closed-loop synchronous operation motor control algorithm for a synchronous motor having a permanent magnet rotor and stator windings. The method comprises initiating the closed-loop start-up method by energizing the stator windings to drive the permanent magnet rotor using motor control signals based on a detected, estimated, or randomly selected initial standstill angle of the permanent magnet rotor. The method includes estimating rate of change values of rotor flux linkage magnitude with respect to a selected vector axis of a two-dimensional rotating orthogonal reference frame of the synchronous motor based on back-electromotive force (emf) induced in the stator windings by rotation of the permanent magnet rotor; and switching-over control of the synchronous motor to the closed-loop synchronous operation motor control algorithm upon determining that one of the rate of change values of the rotor flux linkage magnitude has met a predetermined condition.