| Amorphous alloy could be used as cores in motor replaced of silicon to reduce coreloss and increase efficiency for its excellent electromagnetic properties. Axial-flux permanent magnet motor has the characteristics of high power density, small size, compact structure, but poor heat dissipation ability. Temperature has an ignorable influence on remanence density of permanent magnets, which results in irreversible demagnetization affecting motor electromagnetic performance and operating characteristics. Motor temperature is related to life and reliability of motor operation, and it could be decreased with good cooling structure. Therefore, it is very important to predict motor temperature accurately and come up with an effective cooling structure in stage of motor designing.Firstly, the axial-flux permanent magnet motor is simplified and discretization of mathematical model for thermal calculation is built, based on heat transfer theory and hydromechanics. Thermal network program and its computing platform of amorphous alloy axial-flux permanent magnet motor are compiled, which are verified by finite element method and experiment with a 20 kW axial-flux permanent magnet motor.Secondly, the cooling structure of the 7kW amorphous alloy is studied by the analysis of the cooling structure of the axial flux permanent magnet motor. Taking the spiral structure as a model, the simulation results are compared with the numerical simulation of the different cooling structures. The number of the coil, the thickness and the axial length of the water channel are calculated to design a set of efficient cooling system by helical structure moedl.Finally, On the basis of the optimization design of cooling structure, the optimized design of the cooling structure is compared with the optimization of the cooling effect of the motor, and the optimized structure can significantly reduce the temperature rise of the motor; The temperature field of the motor is studied based on the thermal network computing platform; Changing the inlet velocity and temperature of the cooling water of the spiral structure, the relationship between the optimum water velocity, the inlet temperature and the temperature rise of the motor is obtained by the simulation results; The influence curve of temperature rise of the motor and the selection criteria are obtained by changing the thermal conductivity of the shaft. Based on the above research, the cooling system design and temperature field calculation of the axial flux permanent magnet motor are provided. |
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