| Synchronous reluctance motors with no magnet in the rotor are a robust,
inexpensive, and variable-speed drive motor. The cylindrical iron core
rotor has multiple air gaps, at which the magnetic flux flows in the vertical-axis
direction and hardly flows in the horizontal-axis direction. So, the synchronous
reluctance motor is rotated only by reluctance torque due to the saliency
of the iron core. This note presents the use of magnetic field analysis
to evaluate the average torque with sine wave current drive at each current
phase. |