Torque Calculation and Analysis of Permanent-Magnetic Gears

Permanent-magnetic gears are magneto-mechanical devices that are widely used to replace the ordinary mechanical gears and to transmit torque without any mechanical contact. The transmitted torque is one of the most important properties of magnetic gears. The torque characteristics of radial type permanent magnetic gears are investigated using ANSYS Program. The Maxwell stress tensor technique is used to calculate the torque of the magnetic gears. The results show that the transmitted torque of permanent magnetic gears is sensitive to the factors including the number of magnetic poles, the dimensions of the magnets, the air gap between two gears, the thickness of the yoke, transmission ratio, and the relative angular offset of the two gears. The obtained results can be used as a scientific basis for the design, optimization and application of permanent-magnetic gears.
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