Abstract: A turbomachine includes an electric machine comprising a rotor and a stator in a housing and a fluid end. The fluid end is configured to drive or expand a fluid of 250° C. or higher. The turbomachine includes measures to mitigate heat transfer from the fluid to the components of the electric machine. The fluid end includes an impeller or turbine in a housing, and the impeller or turbine is coupled to the rotor to rotate at the same speed as the rotor. The housing of the fluid end is hermetically sealed to the housing of the electric machine and configured to receive a portion of the fluid. An active magnetic bearing system supports the rotor. The active magnetic bearing system has an axial bearing actuator about an end of the rotor opposite to the rotor or turbine.

Abstract: A turbomachine includes an electric machine comprising a rotor and a stator in a housing and a fluid end. The fluid end is configured to drive or expand a fluid of 250° C. or higher. The turbomachine includes measures to mitigate heat transfer from the fluid to the components of the electric machine. The fluid end includes an impeller or turbine in a housing, and the impeller or turbine is coupled to the rotor to rotate at the same speed as the rotor. The housing of the fluid end is hermetically sealed to the housing of the electric machine and configured to receive a portion of the fluid. An active magnetic bearing system supports the rotor. The active magnetic bearing system has an axial bearing actuator about an end of the rotor opposite to the rotor or turbine.

Abstract: Method and apparatus for containing and protecting the magnets of a permanent magnet rotor spinning at high speeds without the use of a sleeve and is applicable to all permanent magnet rotors with two or more poles. Magnetic pole pieces are used to mechanically retain the magnets as well as provide a low reluctance path for the magnetic field to travel. The pole pieces and magnets are oriented radially on a hub made of a non-magnetic material such that the flux path of the magnets to the rotor poles is not shorted through the hub or shaft. The rotor poles have a taper angle and are secured to the rotor hub; the pole taper angle trapping the magnets, which have a matching taper angle. End cap pieces are provided to retain the rotor poles and the permanent magnets as an integral magnets/poles subassembly for use in a motor or generator.