Research on Operation Mechanisms and Temperature Field for Outer Squirrel-Cage Magnetic Coupler

For the problems such as the large power inner squirrel-cage magnetic coupler cannot be applied because of the poor heat dissipation capacity, an outer squirrel-cage magnetic coupler (OSMC) has been designed. The squirrel-cage rotor which generates the larger heat is used as the outer rotor, while the permanent magnet rotor which generates the smaller heat is used as the inner rotor; outer rotor and inner rotor are equipped with the cooling fins, and the permanent magnet rotor is installed with the axial fans, which can conduct the heat generated by the permanent magnet rotor to the outer squirrel-cage rotor. The electromagnetic torque model of OSMC is established, and its starting torque, maximum torque, synchronous torque, and rated torque are analyzed and calculated; the finite element simulation model of OSMC is established by the ANSYS, and its operating characteristics and temperature field have been respectively analyzed and calculated. The relationship between the output speed, torque, loss and the coupling length of OSMC and the temperature cloud image of the permanent magnet are obtained; it has been proved that the OSMC has good operating characteristics and heat dissipation capability, which can ensure its long-term safe and stable operation.