Patent ID: 11863109
Assignee: CRRC YONGJI ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A device for adjusting a permanent magnet motor, comprising a memory, a processor, and a communication interface,
wherein the memory is configured to store an executable instruction for the processor;
the communication interface is configured to acquire or transmit information according to an instruction of the processor; and
the processor is configured to:
acquire a counter electromotive force (CEMF) parameter, information of an electromagnetic structure of the permanent magnet motor to be adjusted and a resistance value of any short-circuited coil of the permanent magnet motor, the CEMF parameter being a CEMF value of the permanent magnet motor at an upper limited rotational speed;
determine, according to the CEMF parameter, the information of the electromagnetic structure and the resistance value, an operational time of the short-circuited coil;
judge whether the operational time of the short-circuited coil is consistent with a preset time; and
transmit, to a production equipment, an adjustment instruction configured to instruct the production equipment to adjust the electromagnetic structure of the permanent magnet motor, when the operational time of the short-circuited coil is inconsistent with the preset time, so that the production equipment adjusts the electromagnetic structure of the permanent magnet motor,
wherein in order to determine, according to the CEMF parameter, the information of the electromagnetic structure and the resistance value, the operational time of the short-circuited coil, the processor is configured to:
determine a generated heat value of the short-circuited coil by:

Q=I2Rt, 

wherein Q is the generated heat value in Joules, V is the CEMF value in volts, R is the resistance value in Ohms, and t is a unit time;

acquire a heat dissipation value generated by a cooling electromagnetic structure of the permanent magnet motor in the unit time according to information of the cooling electromagnetic structure;
calculate a practical generated heat value of the permanent magnet motor according to the generated heat value and the heat dissipation value, wherein a temperature of the permanent magnet motor rises continuously with an accumulation of the practical generated heat value;
acquire a threshold temperature value that causes an insulating material to melt and the short-circuited coil to be fused; and
determine, according to the temperature of the permanent magnet motor and the threshold temperature value, the operational time of the short-circuited coil, wherein the operational time of the short-circuited coil is an operational time of the permanent magnet motor before reaching the threshold temperature value.