Transient Behavior of Field Modulated Magnetic Gears with Damper Windings

Compared to conventional mechanical gears, field modulated magnetic gears (FMMG) have certain potential for torque and speed transmission in practical engineering in that its merits of intrinsic overloading protection feature and non contacted configuration. However, FMMG always experience oscillations due to their non-rigid magnetic coupling between two rotors while starting and changes in speed or load. In order to improve the dynamic stability of the whole transmission system, the damper windings is introduced to the high-speed rotor of FMMG to suppress the transient oscillations. Based on the field computations by finite element analysis (FEA), the dynamic behavior model is built. Detailed analysis about its parameters, losses, and mathematical model are also reported. The stable ratio and no-load losses were analyzed by the experiment of magnetic gear prototype, respectively.