AG-11 Research on a new type of electrothermal multi-energy dual-stator motor and loss optimization

At present, renewable energy, represented by wind energy, has become an effective alternative to traditional fossil energy. Renewable energy is clean and pollution-free, but because of wind energy’s intermittent and fluctuating characteristics, it cannot be used as baseload energy.[1] Japanese scholars have proposed a wind powered thermal energy system (WTES), which is similar to concentrated solar power.[2] WTES converts all wind energy into thermal energy by heat generator, it solves the influence of wind energy characteristics on power system. But the conversion efficiency of heat to electrical energy is low, which limits the further development of the system. In the paper, a new type of electrothermal multi-energy dual-stator motor (ETDSM) is proposed to replace the initial heat generator, it can realize the simultaneous conversion of wind to electrical energy and thermal energy. It can directly meet a part of electrical demand and convert surplus wind energy into heat energy for utilization, improve the theoretical efficiency of system. The topology of the device is shown in Fig.1(a), it includes the stator core, windings, rotor and permanent magnet. The outer stator is used to generate electricity, while the inner stator is used to generate heat. The heating part is made of low-carbon steel and the outside is excavated to enhance eddy current effect, the devices’ output and loss of the device are shown in Fig.1(b). The heating power is only 20W when the heating part is made of silicon steel sheet material. As shown in Fig.2(1), under the rated condition, the iron loss of the device accounts for 66.1% of the electromagnetic loss of the device, it needs to be optimized. The low-loss silicon steel of JFE and the nano material NANOMET® are selected to replace the original stator core material DW315-50. As shown in Fig.2(2), the iron loss of materials under rated conditions is reduced by 34% and 70.7%. The new material has a good inhibition effect on iron loss. After replacing the new material, other electromagnetic losses of the device have not increased obviously, and the efficiency of the device has been further improved.References: [1]Zhu H, Li H and Liu G, “Energy storage in high renewable penetration power systems: Technologies, applications, supporting policies and suggestions,” CSEE Journal of Power and Energy Systems, vol. 9, no. 6, pp. 2099-2108, Nov. 2023. [2] Okazaki, T., Y. Shirai and T. Nakamura, “Concept study of wind power utilizing direct thermal energy conversion and thermal energy storage,” Renewable Energy, vol.83, pp. 332 – 338, 2016.