Speaker
Description
The inductance of an IPM motor is an important factor in determining the performance of the motor.In particular, spoke type motors use salient pole ratios to utilize reluctance torque, so accurate inductance calculation is an important technique. Many papers have previously been published on inductance calculation methods [1-2]. Recently, with the development of computers, the method of calculating inductance using FEM is widely used. However, the process has the disadvantage of being complicated and time-consuming. Of course, when using FEM, the iron core saturation phenomenon can be calculated with high precision, so the inductance calculation result has the advantage of being highly accurate.
Figure 1 shows the inductance calculated by FEM. $L_{d}$ and $L_{q}$ represent the inductance of each $d$-axis and $q$-axis. Inductance varies depending on the magnitude and phase angle of the current. When calculating with an equivalent circuit, a complicated process is required to accurately calculate the magnetic saturation phenomenon.
In this paper, the inductance was calculated using the magnetic equivalent circuit method and the results were compared with the FEM calculation method. A method of increasing accuracy was applied by applying the iron core saturation nonlinear function and the permanent magnet demagnetization function. A comparison of the analysis results will be presented in the full paper.
Fig. 1 Inductance calculation results according to current and phase angle using FEM analysis.
Acknowledgements
This work was supported by the Technology Innovation Program (No. 20023928) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).
References
[1] Ki-Doek Lee, Ju Lee, and Hyung-Woo Lee, “ Inductance Calculation of Flux Concentrating Permanent Magnet Motor through Nonlinear Magnetic Equivalent Circuit,” IEEE Transactions on Magnetics, vol. 51, no. 11, Institute of Electrical and Electronics Engineers (IEEE), Article Sequence Number: 8204304, November 2015. doi: 10.1109/TMAG.2015.2438000.
[2] Baichuan Xu, Kai Yang, Senior Member, IEEE, Feng Jiang, Songjun Sun, and Yixiao Luo, “ D-Q Axis Inductance Analytical Calculation for Fractional-Slot Distributed Winding IPM Motor Based on Big-Small Pole Space Method,” IEEE Transactions on Industrial Electronics, vol. 71, no. 2 Institute of Electrical and Electronics Engineers (IEEE), pp.1341-1354, February 2024. doi: 10.1109/TIE.2023.3247779.
