Application case of high-speed rotor temperature measurement system for new energy vehicles-EEWORLD

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High-speed motors have the characteristics of small size, high power density, and can be directly connected to drive loads, eliminating traditional mechanical speed increase devices, reducing system noise and improving transmission efficiency. They have broad application prospects in future new equipment such as new energy vehicles, energy storage flywheels, and high-speed centrifugal compressors. Currently, high-speed motors have become one of the research hotspots in the international electrical field.

High-speed motors are developing towards high precision, high power density, high speed and integration, which has brought about problems such as a sharp increase in the internal heat of the motor and a serious lack of effective heat dissipation space. Therefore, the heat dissipation problem has become a bottleneck for the motor system to further develop towards high power density. Excessive internal temperature rise of the motor will not only shorten the life of the insulation material inside the motor, but also reduce the operating efficiency of the motor, increase the heat, and cause the motor temperature to rise further, forming a vicious cycle, seriously affecting the motor life and the safety of the motor operation. Therefore, the use of an efficient heat dissipation system to suppress the motor temperature rise is the key to the development of the motor towards high efficiency, high stability and high reliability. The high-speed motor rotor temperature test data provides data support for high-speed motor performance optimization and cooling design.

The rotor temperature of a high-speed motor is a key data that affects the safety performance of the motor. The rotor temperature test has always been a difficult point in the testing industry. Taking a high-speed motor above 20,000 rpm as an example, when rotating at high speed, the motor rotor is subjected to huge centrifugal force, and the motor rotor rubs against the air gap at high speed. The friction loss caused by the rotor surface is much greater than that of a conventional motor, which brings great difficulties to the heat dissipation of the rotor; and the rotor of a high-speed motor is mostly a slender shaft. Under different internal temperature environments, the possibility of the rotor system approaching the critical speed is greatly increased. In order to obtain the real-time temperature of the motor rotor during operation, the high-speed rotor testing team of Jiujiang Han Tang Optoelectronic Transmission Technology Co., Ltd. launched the HT045028 series rotor temperature measurement system, which successfully provided a one-stop service from test solutions to data collection for the domestic electric drive R&D team, and systematically solved the problem of high-speed motor rotor temperature measurement.

Working principle of rotor temperature measurement system

The rotor temperature measurement system mainly includes temperature sensors, couplings, shock absorbers, adapter circuits, adapter pins, transition brackets, rotation signal couplers, connectors, data acquisition systems and software to form precision electromechanical products of heat exchange devices. The rotor sensor electrical signal is connected to the rotation signal coupler assembly, and the brush micro-pressure is used to reliably contact the rotation signal coupler assembly. The rotation signal coupler transmits the rotating signal to the static brush assembly, completing the conversion and transmission of the sensor signal from rotation to static. The data acquisition system collects the signal for data analysis and storage.