Patent ID: 11894786
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The device according to claim 6, wherein the second obtaining module is specifically configured to obtain a three-phase current in the permanent-magnet synchronous machine control loop at the current moment; transform the three-phase current into a d-axis current and a q-axis current in a fifth-order rotating coordinate system based on a coordinate transformation algorithm and a phase angle of a fifth-order harmonic; filter the d-axis current and the q-axis current in the fifth-order rotating coordinate system by using a filter, so as to obtain the fifth-order harmonic current id5th and the fifth-order harmonic current iq5th; transform the three-phase current into a d-axis current and a d-axis current in a seventh-order rotating coordinate system based on the coordinate transformation algorithm and a phase angle of a seventh-order harmonic; and filter the d-axis current and the q-axis current in the seventh-order rotating coordinate system by using the filter, so as to obtain the seventh-order harmonic current id7th and the seventh-order harmonic current iq7th.