US Patent 11183910 Squirrel cage induction motor for vehicle

A rotor includes a rotor core having slots on an outer periphery to receive rotor bars, short-circuit rings bonded to ends of the rotor bars to electrically connect the rotor bars together, core retainers located across the rotor core in a direction along a rotating shaft, and a deformation prevention portion located between each short-circuit ring and the rotor core. The deformation prevention portion is fixed to the short-circuit ring and to at least a portion of at least one rotor bar to reduce bending deformation of the portion of the rotor bar in a direction tangent to an outer peripheral surface of a portion of the rotor core of the rotor bar.