Virtual temperature sensor, temperature measurement method, motor over-temperature protection system and automobile

Abstract

The invention provides a virtual temperature sensor, a temperature measurement method, a motor over-temperature protection system and an automobile. The virtual temperature sensor is used for acquiring the temperature of a multi-phase winding of a motor, and comprises a plurality of winding temperature nodes arranged on phases of the winding correspondingly, a temperature test node arranged on a certain phase of the winding or an iron core of the motor, a motor cooling node arranged at the cooling position of the motor, and a plurality of equivalent thermal resistors arranged among the nodes;and the virtual temperature sensor calculates and obtains the temperature of each winding temperature node by using a thermal network method, and outputs the maximum value in the temperature of phasesof the winding as the temperature of the motor winding. The virtual temperature sensor can accurately output the highest temperature of the motor winding when the motor is in some special working conditions (such as a low-speed climbing working condition and a locked-rotor working condition) so that over-temperature protection can be timely carried out on the motor, and the influence of over-temperature of each phase of the winding on the service life of the motor is avoided.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a virtual temperature sensor and a temperature measuring method, a readable storage medium, a motor over-temperature protection system and protection method, and an automobile. Background technique [0002] During the load operation of the permanent magnet synchronous motor, the current and resistance in the winding will cause copper loss, resulting in temperature rise of the motor. Especially under the action of some short-term peak currents, the copper loss cannot be conducted due to the slot insulation paper wrapping and the existence of air gaps, causing the winding temperature to rise sharply. In order to obtain the real-time temperature of the winding in time and avoid over-temperature damage to the motor, it is necessary to measure the winding temperature in real time. [0003] At present, motors used in vehicles are usually multi-phase motors, and the temperature of ...

AI Technical Summary

Problems solved by technology

[0004] Therefore, only arranging a temperature sensor in a certain phase winding will cause a large error between the collected temperature signal data and the real maximum temperature of the winding, which will seriously affect the life of the motor insulation and even the personal safety of passengers

Arranging multiple temperature sensors inside the motor will increase the cost of raw materials, research and development, manufacturing and maintenance

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