Patent ID: 11936313
Assignee: KINETIC TECHNOLOGIES INTERNATIONAL HOLDINGS LP
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of aligning a rotor of a polyphase synchronous motor to a predetermined rotor angle, the method comprising the steps of:
sensing voltages or currents in windings of a stator of the motor during synchronous operation of the motor;
based on the sensed voltages or currents, determining a synchronously rotating reference frame vector voltage (Vq) in a q-axis of a synchronously rotating reference frame as a product of a resistance (Rs) of the windings of the stator and a current (iq) in the windings of the stator in the q-axis;
determining, from the synchronously rotating reference frame vector voltage (Vq), corresponding polyphase drive voltages for the motor for a predetermined rotor angle (ϑ) by transforming the synchronously rotating reference frame vector voltage (Vg) to an orthogonal stationary alpha-beta (α-ß) motor coordinate system and then transforming the orthogonal stationary alpha-beta (α-ß) motor coordinate system to a polyphase motor coordinate system; and
applying the corresponding polyphase drive voltages to align the rotor on stopping the rotor at the predetermined rotor angle (ϑ).