Abstract
In order to study the interaction of electromagnetic fields and temperature fields in a motor, the iron loss curve at different frequencies of silicon steel and the B-H curve at different temperatures of the permanent magnet (PM) were obtained to establish the electromagnetic model of the permanent magnet synchronous motor (PMSM). Then, unidirectional and bidirectional coupling models were established and analyzed based on the multi-physical field. By establishing a bidirectional coupling model, the temperature field distribution and electromagnetic characteristics of the motor were analyzed. The interaction between temperature and electromagnetic field was studied. Finally, the temperature of the PMSM was tested. The results showed that the bidirectional coupling results were closer to the test result because of the consideration of the interaction between electromagnetic and thermal fields.
Highlights
In order to study the interaction between the electromagnetic field and temperature field, a bidirectional coupling model was established in this paper
The interaction between the electromagnetic field and temperature field in the working process of the motor was further analyzed with the bidirectional coupling model
The electromagnetic loss is used as the heat source of the temperature field
Summary
With the development of new energy vehicles, the permanent-magnet synchronous motor (PMSM) has been widely used as the main power component. The influence of the stator core temperature on rotor thermal performance [7], the influence of the structure on the motor temperature field [8], and the influence of the inverter switching frequency and the air gap length on the loss [9] were analyzed by using a coupling model of fluid-temperature. The temperature distribution of a permanent-magnet linear motor was analyzed by using the FEM and heat grid model under continuous working conditions to study the influence of the temperature rise on the motor thrust force and efficiency, but the influence of the electromagnetic field on the temperature field was ignored [13]. It is not conducive to the development of high-performance motors and its control strategy
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