Numerical Calculation Of Temperature Fields Of Large And Medium Permanent Magnet Motor

The shortage of energy sources is an important problem that we faced with nowadays, and the scholar at home and abroad more and more attached importance to the technique of energy-saving. The electric power energy is a kind of secondary energy sources, as we all know, the motor consume mostly of the electricity, the high efficiency and energy-saving are always the goal that we pursue in the electrical engineering designing and developing. Simple in structure, small in volume, light in mass, low in loss, high in efficiency, and flexible in shape and size, Permanent Magnet (PM) motor is widely used in industry and agriculture, aviation and spaceflight, national defense and our daily life. With the development of electric machine manufacturing, the unit capacity of PM motor is increasing gradually and technical and economic target improved greatly, which made loss of motor in unit volume increasing obviously and result in temperature in each part of motor rising. Thus the longevity of motor and operational reliability is affected. The practical operation of large-scale PM motor is a very complicated physics phenomenon. To describe this physical process exactly, it is necessary to analyze it from the angle of coupled multi-fields including electromagnetic fields, fluid fields and temperature fields. In this paper, the electromagnetic fields and temperature fields of PM motor are studied by the numerical calculation in FEM, the theoretically analyzed model is developed and calculation method is provided, which are of important significance for the design and optimization of PM motor.