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Effects of Broken Intermediate Ring in Double Skewed Rotor on Thermal and Torque Performances of Induction motor

Double skewed rotor in induction machine (IM) can effectively reduce the electromagnetic noise, but the modified rotor topology may result in extra fault types. In this paper, two kinds of broken intermediate ring (IR) are introduced as the typical double-skewed rotor faults. The effects of broken IR on the thermal and torque performances of IM are well analyzed and quantified. According to the variations of motor performance, the locations of further fracture of the IR could be predicted in a degree. The contributions in this paper are beneficial to improve the design method and fault diagnosis technique of the dual skewed rotor.