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:
Mar. 19, 2024
Filed:
Aug. 31, 2021
Kinetic Technologies International Holdings Lp, Toronto, CA;
Feng Zhu, Wanchai, HK;
Kinetic Technologies International Holdings LP, Toronto, CA;
Abstract
Described is a method of aligning a rotor of a polyphase synchronous motor having a permanent magnet rotor to a predetermined, selected, or specified rotor angle. The method comprises sensing or measuring the stator winding voltages/currents during synchronous operation of the motor. Based on the sensed or measured stator winding voltages/currents, a synchronously rotating reference frame vector voltage (V) in the q-axis is determined as a product of stator winding resistance (R) and stator winding current (i) in the q-axis. Corresponding polyphase drive voltages for the synchronous motor for the predetermined, selected, or specified rotor angle (θ) are determined from the synchronously rotating reference frame vector voltage (V). The polyphase drive voltages are applied to align the rotor on stopping at said predetermined, selected, or specified rotor angle (θ). The polyphase drive voltages are applied by suitable PWM drive signals.