Abstract:
A rotor for an interior permanent magnet machine has a rotor body having an output shaft and a first cavity filled with magnetic material. Second cavities are disposed inboard of the first cavities and are not filled with magnetic material. Non-magnetic rods extend through the second cavities and protrude beyond end faces of the rotor body. The rods are press-fit in blind bores formed in non-magnetic end plates disposed adjacent the end faces of the rotor body. Shrink disks are shrunk around projecting ends of the output shaft in abutting relation with the end plates. In order to prevent induced voltage from generating current in the cage formed by the rods and end plates, an oxide layer is disposed between the rods and blind bores in the end plates.
Abstract:
Automotive propulsion systems and methods of operation are provided. The automotive propulsion system includes a first voltage source, a power electronics device comprising a plurality of power switching devices coupled to the first voltage source, an electric motor having a plurality of windings coupled to the plurality of power switching devices and a neutral node interconnecting the plurality of windings, and a second voltage source coupled to the neutral node of the electric motor and the first voltage source.