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Axial flux stator and rotor core
Axial flux stator and rotor cores are the key magnetic components of axial flux motors, featuring flat disc-shaped structures that differ greatly from cylindrical cores in traditional radial flux motors. Magnetic flux travels parallel to the rotating shaft, forming a shorter magnetic circuit and bringing outstanding torque and power density advantages.
The stator core is stationary, supporting windings and guiding magnetic flux. It is usually made of high-grade silicon steel strips or soft magnetic composites to cut eddy current and hysteresis losses. The rotor core rotates together with permanent magnets, interacting with the stator magnetic field to output torque. Its disc layout allows dual-side magnetic coupling, further lifting energy conversion efficiency.
This core design greatly shortens the axial size of motors, saving installation space. Compared with radial flux counterparts, it achieves higher power-to-weight ratio. However, manufacturing requires high precision due to varying pole pitch along the radius.
Nowadays, axial flux stator and rotor cores are widely adopted in electric vehicles, eVTOL, drones and humanoid robots. As advanced manufacturing matures, these cores will become a mainstream solution for next-generation high-efficiency compact drive systems.
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