Axial Flux Motor

轴向磁通电机Advanced

A flat, disc-shaped motor whose magnetic field crosses the air gap along the shaft's axis.

In an ordinary (radial flux) motor, the magnetic field lines cross the air gap between stator and rotor along the radius, and the rotor is cylindrical; an axial flux motor instead shapes the stator and rotor as facing discs, with the field lines running parallel to the shaft. For the same overall size, this gives a larger effective radius and higher torque density (torque output per unit weight), and the motor itself is very thin along its axis, making it well suited to flat joint modules, hub motors, and electric-vehicle drives. The trade-off is that controlling the air gap and the axial magnetic pull between the discs is harder to manufacture, and cost is higher. Because humanoid robots want joints that are both short and powerful, this is an active area of development for joint motors.

Also called: Disc Motor, Axial Field Motor
Related: Brushless DC Motor · Permanent Magnet Synchronous Motor (PMSM) · Torque Density · Joint Actuator Module · Outrunner Motor · Hub Motor (In-Wheel Motor)
Sources: Axial flux motor - Wikipedia