Dual-rotor motor

This rotor arrangement can increase power volume density, efficiency, and reduce cogging torque.

The effect of the inner rotor is to reenforce the field from the stator.

[1] Because the stator slips behind the rotating magnetic field inducing a current in the rotor, this type of motor meets the definition of an induction motor.

[5] Vendors are working on both axial[6] and radial flux configurations.

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The inner rotor is in the center, surrounded by an empty space for the stator, which will be surrounded by the outer rotor