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, 2024
Filed:
Sep. 08, 2023
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 a speed of a synchronous motor having a rotor and a stator having windings. The method comprises sensing currents in the windings of the stator while the rotor is rotating and transforming the currents into a two-dimensional (2D) coordinate system using an alpha-beta (α-β) transformation, wherein the alpha-beta (α-β) transformation is a Clarke transformation, the 2D coordinate system having an α-axis and a β-axis. The method includes determining a rotor angle θ from an arc tangent (A tan) of a ratio of a current iin the α-axis to a current iin the β-axis and determining a speed of the motor from the rotor angle θ.