Axial ventilation permanent magnet synchronous motor temperature field calculating method

Abstract

The invention relates to an axial ventilation permanent magnet synchronous motor temperature field calculating method. The axial ventilation permanent magnet synchronous motor temperature field calculating method comprises the steps that heat networks of motor parts are respectively established based on heat transfer theory; the heat networks of the parts are mutually connected to form a hot network model of a whole motor structure; modeling is conducted on a cooling airflow in a motor, the cooling airflow is simulated into a hot pressing source controlled by the cooling airflow amount, the airflow temperatures are set to linearly change at the end and in a rotor ventilation hole, and the airflow temperatures at respective midpoint positions are regarded as average temperature rise of the airflow; the hot pressing source representing the cooling airflow is combined with the heat networks of the motor structure: nodal equations are listed to solve node temperatures. An accurate and reasonable motor temperature field can be obtained by adopting the axial ventilation permanent magnet synchronous motor temperature field calculating method.

Description

technical field [0001] The invention belongs to the field of motor temperature field calculation characteristic analysis, and in particular relates to a motor temperature field calculation method based on a model integrating a cooling medium and a thermal network of the motor's own structure. Background technique [0002] Compared with traditional electric excitation motors, permanent magnet synchronous motors have many advantages such as simple structure, strong reliability, and high power density, so they are widely used. However, if the temperature is too high, the permanent magnet material will be demagnetized, which will affect the efficiency, service life and reliability of the motor. Therefore, the calculation of the temperature field is an essential link in the design process of the permanent magnet synchronous motor. When calculating the temperature field of the motor, the finite element method and the equivalent thermal network method are commonly used. The calcul...

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Problems solved by technology

At present, the problem of the equivalent thermal network model of the motor is that when establishing the network, it is usually assumed that the motor has a symmetrical structure in the axial direction, and the influence of the axial temperature difference of the cooling medium on the temperature field distribution of the motor is ignored. Symmetrical distribution, which is unreasonable in motors with large axial temperature difference of cooling medium

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