A Fast Calculation Algorithm for Dynamic Characteristics of Electromagnetic Structure Under Different Temperature Conditions

• 1、School of Electrical Engineering and Automation，Harbin Insititute of Technology, Harbin, China 150001

Abstract：Electromagnetic structure is an important part of electrical devices such as relays and contactors. The dynamic characteristics analysis is a significant aspect for the design of such devices. The dynamic characteristics of the electromagnetic structure are highly influenced by the temperature. The influence of the temperature should be considered at the same time in order to ensure efficient and precise simulation. In this paper, an improved Magnetic Equivalent Circuit method considering the temperature is proposed. The proposed novel method combines the efficient Magnetic Equivalent Circuit (MEC) method and the Finite Element (FE) method to establish a quick calculation model. In the method, a three dimensional compensation matrix is established to take into account the influence of the temperature on the coil resistance and the soft magnetic material. The compensation matrix corrects the error due to leakage and saturation of the MEC method under different temperatures. Then the formula of the interpolation error estimation is adopted to determine the number of sample points. It serves as a basis for selecting the number of FE data points when the compensation matrix is built. Lastly, the dynamic characteristics of a typical DC high-power contactor are simulated under different environment temperatures to verify the correctness and efficiency of the proposed method. The maximum error produced by the proposed method is less than 4% compared to the FE method.

Keywords： Electromagnetic structure, dynamic characteristics, temperature, compensation matrix, interpolation