VP18-02 Investigation of magnetic properties of high permeability materials at 77.15K temperature
Creators: Jun Li
Chuanlei Qin
Jiahao Ge
Xiaodong Hu
Lubin Zeng
and Ruilin Pei
Publisher: name: IEEE
Year: 2025

With the development of the times, there is an increasing demand for low-temperature high-speed motors in aerospace and aviation fields [1]. The main method to enhance the performance of traditional high-speed motors is by changing the topology of the rotor [2]. In this paper, a new core material, FeNi (1J50), is proposed to utilize the material's low magnetic field and high permeability characteristics to make the motor with low losses, which is very suitable for high-speed motors. However, extremely low temperatures can have an effect on the material properties and thus the motor. Currently, there have been few studies on the changes in magnetic properties of 1J50 at low temperatures. In the second part of this paper, low-temperature experiments on 1J50 were conducted by building a magnetic-thermal coupling experimental setup, as shown in Fig. 1. The magnetic properties of 1J50 material are tested under variable temperature (77K-223.15K), and some experimental results are shown in Fig. 2. The iron loss change rule of 1J50 under the influence of low temperature is revealed. The third part of this paper utilizes the above experimental data to reconstruct the loss model for 1J50. On the basis of the existing classical loss model of silicon steel, the influence of low temperature is added, the correlation analysis of the influence of low temperature on the eddy current loss and hysteresis loss of 1J50 is carried out, and the loss coefficients are corrected. In the fourth part of this paper, the proposed loss model is validated using the finite element method to verify the accuracy of the model.References: [1] Wolnik, Tomasz, Tomasz Jarek. "Improvement Studies of High Power Density Motor for Aviation and Marine Application." In 2023 23rd International Scientific Conference on Electric Power Engineering (EPE), pp. 1-6. IEEE, 2023. [2] A. Credo, G. Fabri, M. Villani , "Adopting the Topology Optimization in the Design of High-Speed Synchronous Reluctance Motors for Electric Vehicles," in IEEE Transactions on Industry Applications, vol. 56, no. 5, pp. 5429-5438, Sept.-Oct. 2020.
With the development of the times, there is an increasing demand for low-temperature high-speed motors in aerospace and aviation fields [1]. The main method to enhance the performance of traditional high-speed motors is by changing the topology of the rotor [2]. In this paper, a new core material, FeNi (1J50), is proposed to utilize the material's low magnetic field and high permeability characteristics to make the motor with low losses, which is very suitable for high-speed motors. However, extremely low temperatures can have an effect on the material properties and thus the motor. Currently, there have been few studies on the changes in magnetic properties of 1J50 at low temperatures. In the second part of this paper, low-temperature experiments on 1J50 were conducted by building a magnetic-thermal coupling experimental setup, as shown in Fig. 1. The magnetic properties of 1J50 material are tested under variable temperature (77K-223.15K), and some experimental results are shown in Fig. 2. The iron loss change rule of 1J50 under the influence of low temperature is revealed. The third part of this paper utilizes the above experimental data to reconstruct the loss model for 1J50. On the basis of the existing classical loss model of silicon steel, the influence of low temperature is added, the correlation analysis of the influence of low temperature on the eddy current loss and hysteresis loss of 1J50 is carried out, and the loss coefficients are corrected. In the fourth part of this paper, the proposed loss model is validated using the finite element method to verify the accuracy of the model.References: [1] Wolnik, Tomasz, Tomasz Jarek. "Improvement Studies of High Power Density Motor for Aviation and Marine Application." In 2023 23rd International Scientific Conference on Electric Power Engineering (EPE), pp. 1-6. IEEE, 2023. [2] A. Credo, G. Fabri, M. Villani , "Adopting the Topology Optimization in the Design of High-Speed Synchronous Reluctance Motors for Electric Vehicles," in IEEE Transactions on Industry Applications, vol. 56, no. 5, pp. 5429-5438, Sept.-Oct. 2020.