B23HS085 Grain electrical Silicon Steel

Non Grain-Oriented (NGO) silicon steel^1,2 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.

The grain-oriented silicon steel is a soft magnetic material that is used as the core material in electrical transformers. It is characterized by a pronounced Goss texture, i.e a 110 <001>³ The grain structure of NGO silicon steel is disorderly, mixed with a large number of messy and different textures. At present, most of the core components of Permanent Magnet Synchronous Machine (PMSM) are laminated by NGO silicon steel sheets. Therefore, 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. However, due to the low silicon content of the NGO silicon steel itself (silicon content lower than 3.5%) and the limitations of metallographic structure, NGO silicon steel will become increasingly difficult to meet the design requirements of new motors.

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