Abstract: A rotor assembly for an electric motor for a turbomachine defines an axis of rotation. The rotor assembly includes a jacket member that is hollow and that defines an inner radial surface facing inwardly toward the axis of rotation. Furthermore, the rotor assembly includes a magnet member that is received within the jacket member. The magnet member includes an outer radial surface facing outwardly from the axis of rotation. The jacket member is made of a sintered composite material having carbon filament and a sintered matrix. Additionally, the inner radial surface of the jacket member abuts against the outer radial surface of the magnet member to retain the magnet member in a radial position relative to the axis.

Abstract: A rotor assembly for a permanent magnet electric motor defines an axis of rotation and includes a jacket member and a magnet member. The magnet member is received within the jacket member. The magnet member defines a central aperture with a first end and a second end. The axis of rotation extends through the first end and the second end. The rotor assembly further includes a shaft arrangement with a first shaft structure and a second shaft structure. The first shaft structure is received in the first end of the magnet member, and the second shaft structure is received in the second end of the magnet member. The first shaft structure and the second shaft structure are attached within the magnet member at an internal coupling. The shaft arrangement and the jacket member cooperate to compress the magnet member radially with respect to the axis of rotation.

Abstract: A rotor assembly for a permanent magnet electric motor defines an axis of rotation and includes a jacket member and a magnet member that is received within the jacket member. The magnet member defines a central aperture. The rotor assembly also includes a shaft structure with a base member and a biasing projection that projects from the base member. The biasing projection is received within the central aperture of the magnet member. The biasing projection biases the magnet member toward the jacket member in an outward radial direction away from the axis of rotation for retaining the magnet member and the jacket member together.

Abstract: A rotor assembly for a permanent magnet electric motor defines an axis of rotation and includes a jacket member and a magnet member. The magnet member is received within the jacket member. The magnet member defines a central aperture with a first end and a second end. The axis of rotation extends through the first end and the second end. The rotor assembly further includes a shaft arrangement with a first shaft structure and a second shaft structure. The first shaft structure is received in the first end of the magnet member, and the second shaft structure is received in the second end of the magnet member. The first shaft structure and the second shaft structure are attached within the magnet member at an internal coupling. The shaft arrangement and the jacket member cooperate to compress the magnet member radially with respect to the axis of rotation.

Abstract: A rotor assembly for a permanent magnet electric motor defines an axis of rotation and includes a jacket member and a magnet member that is received within the jacket member. The magnet member defines a central aperture. The rotor assembly also includes a shaft structure with a base member and a biasing projection that projects from the base member. The biasing projection is received within the central aperture of the magnet member. The biasing projection biases the magnet member toward the jacket member in an outward radial direction away from the axis of rotation for retaining the magnet member and the jacket member together.