Reluctance motor

Reluctance motors can deliver high power density at low cost, making them attractive for many applications.

[disputed – discuss] Advances in theory, computer design tools, and low-cost embedded systems for control overcame these obstacles.

Microcontrollers use real-time computing control algorithms to tailor drive waveforms according to rotor position and current/voltage feedback.

The stator consists of multiple projecting (salient) electromagnet poles, similar to a wound field brushed DC motor.

The use of nonpermeable posts and bridges allows them to be larger and stronger, reducing interfence between the flux lines of the rotor and the stator.

Unlike brushed DC motors, power is delivered to windings in the stator (case) rather than the rotor.

However it complicates the electrical design, because a switching system must deliver power to the different windings and limit torque ripple.

Common uses include applications where the rotor must remain stationary for long periods, and in potentially explosive environments such as mining, because no commutation is involved.