Overview
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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. |
Magnetic Flux Distribution /Torque Characteristics
| Figure 1 shows the magnetic flux density distribution at the rotation speed
of 600 rpm and the current amplitude of 3.0 A. Figure 2 shows the average
torque at different current phases. The magnetic circuit changes with the
current phase. In addition, the average torque becomes zero at the current
phase of 0 degrees and 90 degrees, and is maximized at the current phase
of 45 degrees. |
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