A canned rotodynamic flow machine (1) configured for operating with a working fluid such as molten salt of a molten salt nuclear reactor. The stator windings are formed by one or more electrically conductive solid bars (12).

A rotor casting includes a lamination stack and a cast structure including proximal and distal cast end rings respectively adjacent proximal and distal end faces of the lamination stack. Cast axial ribs are distributed radially on a peripheral surface of the lamination stack and extend between the proximal and distal cast end rings. Cast feed members extend axially from the proximal cast end ring and are respectively positioned radially between an adjacent pair of axial ribs. In one example, cast bar segments integral to the proximal and distal cast end rings are formed in axial slots of the lamination stack. In one example, a bar insert in each axial slot has insert ends that extend respectively from the proximal and distal end faces of the lamination stack and are fully encapsulated respectively in the proximal and distal cast end rings. A method of forming the rotor casting is provided.

There is a growing need for line-start single-phase electric motors that provide in combination high starting torque, high efficiency and low acoustic signature, particularly for use in hermetically sealed devices including, but not limited to, reciprocating piston systems for power generation and gas compression. This disclosure provides is a single-phase induction machine that meets this need.

A cage rotor of a rotary asynchronous machine includes an axially laminated core having substantially axially extending grooves, at least one electrical conductor disposed in the grooves and composed of at least of two partial conductors constructed from materials having different electrical conductivities and different mechanical strengths, wherein the partial conductor made of the higher-strength material is disposed radially farther outwardly at least in sections of the groove, as viewed along the axial extent of the respective, and a short-circuit ring arranged on a respective end face side of the laminated core and electrically-conductively interconnecting the electrical conductors that are disposed in the respective grooves and protrude axially from the laminated core.

A rotor casting includes a lamination stack and a cast structure including proximal and distal cast end rings respectively adjacent proximal and distal end faces of the lamination stack. Cast axial ribs are distributed radially on a peripheral surface of the lamination stack and extend between the proximal and distal cast end rings. Cast feed members extend axially from the proximal cast end ring and are respectively positioned radially between an adjacent pair of axial ribs. In one example, cast bar segments integral to the proximal and distal cast end rings are formed in axial slots of the lamination stack. In one example, a bar insert in each axial slot has insert ends that extend respectively from the proximal and distal end faces of the lamination stack and are fully encapsulated respectively in the proximal and distal cast end rings. A method of forming the rotor casting is provided.

A rotor casting includes a lamination stack and a cast structure including proximal and distal cast end rings respectively adjacent proximal and distal end faces of the lamination stack. Cast axial ribs are distributed radially on a peripheral surface of the lamination stack and extend between the proximal and distal cast end rings. Cast feed members extend axially from the proximal cast end ring and are respectively positioned radially between an adjacent pair of axial ribs. In one example, cast bar segments integral to the proximal and distal cast end rings are formed in axial slots of the lamination stack. In one example, a bar insert in each axial slot has insert ends that extend respectively from the proximal and distal end faces of the lamination stack and are fully encapsulated respectively in the proximal and distal cast end rings. A method of forming the rotor casting is provided.

A rotor of an asynchronous machine with a cage rotor includes a laminated core formed from a plurality of partial laminated cores. The laminated core has substantially axially extending conductors arranged in slots in the laminated core. The conductors include at least two materials of different electrical conductivities, such that a material with a higher electrical conductivity surrounds a material with a lower electrical conductivity by at least 65% in a circumferential direction.

A motor includes a cylindrical stator and a cylindrical rotor rotatably provided in the stator coaxially with the center axis of the stator and is used to drive wheels of a vehicle with rotation of the rotor. The rotor includes a cage including a single short-circuit ring formed in a ring shape and a plurality of secondary conductors. First end portions and second end portions of the secondary conductors are respectively connected to positions separated in the circumferential direction in the single short-circuit ring.

A motor includes a cylindrical stator and a cylindrical rotor rotatably provided in the stator coaxially with the center axis of the stator and is used to drive wheels of a vehicle with rotation of the rotor. The rotor includes a cage including a single short-circuit ring formed in a ring shape and a plurality of secondary conductors. First end portions and second end portions of the secondary conductors are respectively connected to positions separated in the circumferential direction in the single short-circuit ring.

A rotor (10) for an axial-flux electrical machine (12) is provided. The rotor (10) comprises an annular disc-shaped central frame (20) formed of a ferromagnetic material and having first and second opposing surfaces (26, 28). Each of the first and second opposing surface (26, 28) has shaped protrusions (40) extending therefrom. The rotor (10) further comprises a first and a second outer frame (22, 24) formed of a non-ferromagnetic, electrically conducting material. Each outer frame (22, 24) has an inner periphery portion (32) and an outer periphery portion (34) and a plurality of bars (36) galvanically connecting the inner and outer periphery portions (32, 34). Gap portions (38) are defined between adjacent bars (36) and the inner and outer periphery portions (32, 34). The gap portions (38) are shaped complementary to the shaped protrusions (40) of the central frame (20).