| With the growing concern of the environment pollution and the energy crisis, the governments and the auto manufacturer have reached a consensus on the development.In recent years, the extended-range electric vehicles which not only inherit the no-emission characteristic of the electric vehicles, but also possess the merit of long cruising range, thus arising the considerable attention in the field. The double rotor permanent magnet motor have potential applications in the extended-range electric vehicles due to its merits such as, high torque(power) density, high efficiency, and flexible working modes. This kind of motors is composed with two permanent magnet motors tactfully, which can not only realize the high integration degree of the motor,but also exhibit various power distribution mode and satisfy the requirements of the extended-range electric vehicles. However, the double-rotor permanent magnet motor shows higher temperature rise than the traditional single rotor permanent magnet machine in the actual operation. Especially, the frequent operating mode switch and limited working space result in the unneglectable temperature rise, especially due to the urban gradual complex driving cycle, which makes the electromagnetic performance of the motor hard to maintain a high level. Consequently, it is important to analyze the thermal field of the motor and the actual influence of different temperature on the electromagnetic performance of the motor.The paper takes the brushless double-rotor flux switching permanent magnet motor(BDR-FSPM) motor as the research subject. And the electromagnetic performance analysis, temperature rise and the electromagnetic performance analysis based on the electric-thermal analysis of the proposed motor is conducted. The main points are listed in the followings:Firstly, the BDR-FSPM is treated as the research subject according to the requirements of the extended-range electric vehicles. The parametric model of the BDR-FSPM is built based on the finite element method. Thereafter, theelectromagnetic performance analysis and the loss calculation of the proposed motor are conducted, which lay the foundation of the after mentioned thermal analysis and the electrical-thermal analysis of the BDR-FSPM motor.Furthermore, the three dimensional thermal model is established to calculate the temperature distribution of the motor according to the structure characteristics of the BDR-FSPM motor. The temperature analysis of the BDR-FSPM motor is conducted under different load or different working mode according to the complex driving cycles of the electric vehicles. On the basis of the aforementioned analysis, the cooling system of the BDR-FSPM motor is designed and the thermal model of the cooling system is also built, thus conducting the heat distribution analysis of the motor, which lay the foundation of the successive electromagnetic performance analysis of the motor based on the electrical-thermal two-way coupling method.Moreover, on the basis of the motor ’ s basic electromagnetic performance analysis and the thermal field analysis, the thermal characteristics of the motor material are introduced, including the silicon steel, armature windings, and the permanent magnets. Also, the demagnetization model of the permanent magnets under different temperature is established. According to the thermal characteristics of the motor material, the real-time electromagnetic performance analysis of the BDR-FSPM motor which based on the electrical-thermal two-way coupling method is conducted, thus profoundly investigating the influence of the temperature on the motor performances and provide theoretical evidence for the follow-up experiments.Finally, the prototype machine of the BDR-FSPM machine is manufactured and the experiment platform is built. On this basis, no-load and load characteristics of the principle prototype are tested, hence verifying the reliability of the motor structure and the validity of the electrical-thermal two-way coupling analysis method. |
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