A rotary mechanical system includes an electric machine, such as an electric motor, and a housing at least partially housing one or more components of the electric machine. The housing defines an electrical cavity and a coolant cavity. The electrical cavity houses one or more electrical components, such as a stator, of the electric machine. The coolant cavity is configured to receive a liquid coolant, such as ethylene glycol and water, from a liquid coolant system. The housing is configured to seal a two-phase refrigerant within the electrical cavity to transfer heat from the one or more electrical components to a wall of the electrical cavity and from the wall of the electrical cavity to the liquid coolant.

One aspect of a pump of the present invention includes a rotor rotatable about a central axis, a stator assembly located radially outside the rotor and surrounding the rotor, a pump unit connected to a first side in an axial direction of the rotor, a support member including a rotor accommodating portion, the rotor accommodating portion being located radially inside the stator assembly and accommodates the rotor therein, and a resin housing in which the stator assembly and the support member are molded. The rotor accommodating portion includes a lid portion that covers the rotor from a second side in the axial direction, and a tubular portion that is located between the rotor and the stator assembly in a radial direction and is open to the first side in the axial direction. The stator assembly includes a stator core having an annular shape, a plurality of coils mounted on the stator core, and a stator cover that covers the plurality of coils.

A canned motor device includes a casing, a rear cover and a leak detector. The rear cover has a main body portion having a cover end wall, and an extended disk portion cooperating with the main body portion to define an accommodating space. The casing and the rear cover cooperatively define an annular groove, a liquid-receiving space and a plurality of guiding grooves therebetween. The leak detector is disposed on one side of the cover end wall opposite to the liquid-receiving space for detecting a change in electrostatic capacity between the leak detector and the liquid-receiving space. The annular groove communicates with the liquid-receiving space, the accommodating space and each of the guiding grooves.

A canned motor device includes a base, a fixed seat, a motor unit and a motor cover. Each of the base and the fixed seat is formed in a shape of a hollow cylinder that surrounds an axis. The base has an inner base surface surrounding the axis and defining an accommodating space. The fixed seat is disposed in the accommodating space and has an inner seat surface, an outer seat surface, a plurality of recesses and a plurality of first heat-dissipating fins. The recesses are indented from the outer seat surface and extend toward the inner seat surface. Each of the first heat-dissipating fins is located between two adjacent ones of the recesses.

A rotor is a rotor for a pump. The rotor includes a rotor core having a magnet insertion hole and having an annular shape about an axis, a permanent magnet inserted in the magnet insertion hole, and a rotor cover surrounding the rotor core from outside in a radial direction about the axis. The rotor core has a first core portion disposed on an inner side of the magnet insertion hole in the radial direction, a second core portion disposed on an outer side of the magnet insertion hole in the radial direction, and a hole separating the first core portion and the second core portion from each other. The rotor cover has a positioning portion that positions the first core portion and the second core portion in a circumferential direction about the axis.

A canned motor, including: a motor housing, a stator fixed to the motor housing, a rotor mounted on the motor housing so as to be rotatable relative to the stator about an axis of rotation, a can fixed to the stator radially between the stator and the rotor, at least one annular seal carrier fixed to the motor housing, radially inside the can, at an axial stator end, and at least one annular seal supported radially and axially on the seal carrier, the at least one annular seal configured to seal off a rotor space, in which the rotor is arranged, from a stator space through which a coolant can flow, wherein the stator space has a main region and an annular region, which extends from the at least one annular seal along the seal carrier and merges into the main region at a distance from the seal.

Provided is a stator including a coil of a winding of a flat wire conductor, a stator core including a slot for housing a part of the coil, and a flow passage part through which a coolant flows, provided between a wall part of the slot and an outer surface of the coil facing the wall part. The extension shape of the flow passage part from an inlet to an outlet for the coolant changes along the axial direction of the stator core. The flow passage part is, for example, a concave part formed on the wall part of the slot.

An electric motor vehicle traction motor, including: a liquid-cooled motor stator, a dry-running motor rotor, and a fluid-tight split cage which separates the motor stator and the motor rotor from one another fluidically, the split cage being formed by a fiber composite body, wherein the split cage is axially prestressed in a long-lasting manner by a split cage axial stressing apparatus.

An electric motor vehicle traction motor, including: a liquid-cooled motor stator, a dry-running motor rotor, and a fluid-tight split cage which separates the motor stator and the motor rotor from one another fluidically, the split cage being formed by a fiber composite body, wherein the split cage is axially prestressed in a long-lasting manner by a split cage axial stressing apparatus.

A submersible pump assembly includes an electric motor (1) and a centrifugal pump, which is driven by the electric motor (1). A rotor (4) formed of plastic or composite material which is manufactured in the extrusion or pultrusion method.