Permanent magnet motor rotor temperature measurement device and measurement method

Abstract

The invention relates to a permanent magnet motor rotor temperature measurement device. The device comprises a thermistor, a slip ring, two groups of electric brushes and a data processor, wherein the thermistor is fixed on and attached to a permanent magnet of a rotor core; the two groups of electric brushes are fixed on the inner wall of a permanent magnet motor respectively; the slip ring is sleeved and fixed on the rotating shaft of the motor, and comprises two semi-ring parts which are insulated with each other; the two semi-ring parts are in circuit connection with two ends of the thermistor respectively, and in close contact with one of the two groups of electric brushes respectively; and the two groups of electric brushes are connected with the data processor respectively. The invention also provides a method for realizing permanent magnet motor rotor temperature measurement by utilizing the device. By adopting the permanent magnet motor rotor temperature measurement device and the measurement method, the data processor can measure the resistance of the thermistor through the electric brushes and the slip ring, and converts the resistance into temperature, thus the temperature measurement of the rotor is realized; and the method is not interrupted by environmental factors, has high measurement accuracy, and further ensures stable operation of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to the technical field of permanent magnet motors, in particular to a permanent magnet motor rotor temperature measuring device and a measuring method. Background technique [0002] With the rapid increase of car ownership worldwide and the intensification of vehicle exhaust emissions, the resulting resource and environmental problems have become increasingly prominent. Therefore, major scientific research institutions and OEMs in the world have taken the research and development of new energy vehicles as a scientific research focus. New energy vehicles mainly include pure electric vehicles, hybrid vehicles and fuel cell vehicles. Due to the constraints of battery technology, the development and application of pure electric vehicles are limited to a certain extent. Therefore, hybrid vehicles between traditional fuel vehicles and pure electric vehicles have gained unprecedented devel...

AI Technical Summary

Problems solved by technology

[0004] At present, the infrared remote sensing technology is mostly used in the world to measure the rotor temperature. This method has certain limitations, such as the wireless transmission process of the signal is relatively easy to be interfered by the external electromagnetic field, resulting in inaccurate measurement results. In addition, the infrared remote sensing system very expensive

Therefore, the bottleneck of rotor temperature measurement technology seriously restricts the further development and application of permanent magnet motors in the field of hybrid electric vehicles.

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