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:
Nov. 14, 2023
Filed:
Aug. 31, 2021
Kinetic Technologies International Holdings Lp, Toronto, CA;
Kwei Chung Li, Kowloon, HK;
Kinetic Technologies International Holdings LP, Toronto, CA;
Abstract
Described is a method of determining an initial speed of a synchronous motor having a permanent magnet rotor. The method comprises controlling said motor to cause the rotor to rotate or observing that the rotor is rotating. The method includes sensing stator winding currents and transforming the sensed stator winding currents into a two-dimensional (2D) coordinate system using an alpha-beta (α-β) transformation. The rotor angle θ is determined from an arc tangent (Atan) of the ratio of the current in the α-axis to the current in the β-axis. The initial motor speed ω is determined from the determined rotor angle θ.