Abstract
The saturation magnetic density is lower due to the silicon content of the conventional motor core made of Non Grain-Oriented (NGO) silicon steel. It is increasingly difficult to meet the demand for high power density and high torque density of modern motors. Based on the above reasons, this paper proposed the idea of replacing the NGO silicon steel core by the Grain-Oriented (GO) silicon steel core part through a combined design. This paper mainly presents a novel thin an-isotropic GO silicon steel core used in high-speed (up to 14500rpm) traction motors. Magnetic saturation, power loss, thermal conductivity, and mechanical property analysis of the motor have been completed. Numerical modeling and experimental results have been given. The new prototype is being fabricated and it can be produced in mass production in the next few years.
Highlights
Electrical steel is one of the core magnetic materials in EV traction motor
This paper mainly presents that a novel thin-anisotropic Grain-Oriented (GO) silicon steel is used in high-speed traction motors after deeply analysing magnetic saturation, power loss, thermal conductivity and mechanical property of a traction motor with high-frequency (50Hz-400Hz) and high-torque running status
The grain-oriented silicon steel is a soft magnetic material that is used as the core material in electrical transformers
Summary
Electrical steel is one of the core magnetic materials in EV traction motor. In terms of high power density and torque density for the EV traction motors. This paper mainly presents that a novel thin-anisotropic Grain-Oriented (GO) silicon steel is used in high-speed (up to 14500rpm) traction motors after deeply analysing magnetic saturation, power loss, thermal conductivity and mechanical property of a traction motor with high-frequency (50Hz-400Hz) and high-torque running status. It applies a combination design between NGO and GO steel in order to avoid the low magnetic permeability in the transverse direction. With the development trend of miniaturization and high density of electric motors system, the main requirements for iron-core silicon steel materials in the future will be high saturated flux density and low iron loss. The new prototype is being fabricated and it can be produced in mass production in few years
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