Rotor Temperature Online Estimation of Built-in Permanent Magnet Synchronous Motor for Electric Vehicle

Realizing the online monitoring of the rotor temperature of the permanent magnet synchronous motor used in electric vehicles is not only crucial to ensure the normal operation of the motor, but also increases the duration of the motor's peak torque and maximizes the motor's working potenti...

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Veröffentlicht in:Ji xie gong cheng xue bao 2023, Vol.59 (24), p.209
Hauptverfasser: Xiao, Zongxin, Hu, Minghui, Shi, Liwang, Zhou, Anjian
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container_issue 24
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container_title Ji xie gong cheng xue bao
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Hu, Minghui
Shi, Liwang
Zhou, Anjian
description Realizing the online monitoring of the rotor temperature of the permanent magnet synchronous motor used in electric vehicles is not only crucial to ensure the normal operation of the motor, but also increases the duration of the motor's peak torque and maximizes the motor's working potential. Therefore, based on the idea of magneto-thermal bidirectional coupling, a specific magnetic-thermal bidirectional coupling technical route for estimating the rotor temperature of the built-in permanent magnet synchronous motor(IPMSM) for vehicles is proposed. Firstly, on the basis of the traditional motor lumped parameter model, a lumped parameter electromagnetic model considering the influence of motor temperature is established; then, based on the temperature characteristics of the resistance, magnetic density, and electrical conductivity of the IPMSM material, a motor loss model considering the influence of motor temperature is established. Finally, according to the principle of heat transfer and the distribution of motor loss, the motor is divided into nodes, an equivalent thermal network model of IPMSM is established, and the thermal parameters in the thermal network model are identified by particle swarm optimization algorithm. Combined with the electromagnetic model, loss model and equivalent thermal network model, a magneto-thermal bidirectional coupled rotor temperature online estimation model is constructed, which realizes the rapid online estimation of the rotor temperature of the motor. The accuracy of the rotor temperature estimation model is verified by bench tests and real vehicle road tests under different ambient temperatures and working conditions. The test results show that the proposed rotor temperature estimation model has high estimation accuracy, and the rotor temperature estimation errors are all within ±3 ℃, which can greatly increase the rotor temperature threshold, prolong the peak torque duration, and improve the motor performance.
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Therefore, based on the idea of magneto-thermal bidirectional coupling, a specific magnetic-thermal bidirectional coupling technical route for estimating the rotor temperature of the built-in permanent magnet synchronous motor(IPMSM) for vehicles is proposed. Firstly, on the basis of the traditional motor lumped parameter model, a lumped parameter electromagnetic model considering the influence of motor temperature is established; then, based on the temperature characteristics of the resistance, magnetic density, and electrical conductivity of the IPMSM material, a motor loss model considering the influence of motor temperature is established. Finally, according to the principle of heat transfer and the distribution of motor loss, the motor is divided into nodes, an equivalent thermal network model of IPMSM is established, and the thermal parameters in the thermal network model are identified by particle swarm optimization algorithm. Combined with the electromagnetic model, loss model and equivalent thermal network model, a magneto-thermal bidirectional coupled rotor temperature online estimation model is constructed, which realizes the rapid online estimation of the rotor temperature of the motor. The accuracy of the rotor temperature estimation model is verified by bench tests and real vehicle road tests under different ambient temperatures and working conditions. 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Therefore, based on the idea of magneto-thermal bidirectional coupling, a specific magnetic-thermal bidirectional coupling technical route for estimating the rotor temperature of the built-in permanent magnet synchronous motor(IPMSM) for vehicles is proposed. Firstly, on the basis of the traditional motor lumped parameter model, a lumped parameter electromagnetic model considering the influence of motor temperature is established; then, based on the temperature characteristics of the resistance, magnetic density, and electrical conductivity of the IPMSM material, a motor loss model considering the influence of motor temperature is established. Finally, according to the principle of heat transfer and the distribution of motor loss, the motor is divided into nodes, an equivalent thermal network model of IPMSM is established, and the thermal parameters in the thermal network model are identified by particle swarm optimization algorithm. Combined with the electromagnetic model, loss model and equivalent thermal network model, a magneto-thermal bidirectional coupled rotor temperature online estimation model is constructed, which realizes the rapid online estimation of the rotor temperature of the motor. The accuracy of the rotor temperature estimation model is verified by bench tests and real vehicle road tests under different ambient temperatures and working conditions. 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Combined with the electromagnetic model, loss model and equivalent thermal network model, a magneto-thermal bidirectional coupled rotor temperature online estimation model is constructed, which realizes the rapid online estimation of the rotor temperature of the motor. The accuracy of the rotor temperature estimation model is verified by bench tests and real vehicle road tests under different ambient temperatures and working conditions. The test results show that the proposed rotor temperature estimation model has high estimation accuracy, and the rotor temperature estimation errors are all within ±3 ℃, which can greatly increase the rotor temperature threshold, prolong the peak torque duration, and improve the motor performance.</abstract><cop>Beijing</cop><pub>Chinese Mechanical Engineering Society (CMES)</pub><doi>10.3901/JME.2023.24.209</doi><oa>free_for_read</oa></addata></record>
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subjects Algorithms
Ambient temperature
Coupling
Electric vehicles
Electrical resistivity
Equivalence
Estimation
Mathematical models
Parameter identification
Particle swarm optimization
Permanent magnets
Road tests
Rotors
Synchronous motors
Temperature
Thermodynamic properties
Torque
title Rotor Temperature Online Estimation of Built-in Permanent Magnet Synchronous Motor for Electric Vehicle
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