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.

An electric pump includes a pump housing, a rotor assembly, a stator assembly, an isolation sleeve, a heat dissipation plate and an electric control board. The pump housing defines a pump inner chamber; the pump inner chamber is partitioned into a first cavity and a second cavity by the isolation sleeve; the rotor assembly is disposed in the first cavity; the stator assembly and the electric control board are disposed in the second cavity; the isolation sleeve comprises a bottom portion; at least a portion of the heat dissipation plate is disposed between the electric control board and the bottom portion; at least a portion of the bottom portion and at least a portion of the heat dissipation plate are in direct contact, or are filled with thermal silicone grease or thermal silica therebetween, or are provided with a thermal patch therebetween.

An electric centrifugal pump having a motor housing, a pump head, a containment shell, and a rotor assembly consisting of a pump impeller and a permanent magnet rotor, wherein the pump head with the containment shell defines a wet chamber, in which the rotor assembly is arranged rotationally around a longitudinal motor axis, the containment shell with the motor housing defines a dry chamber, in which a wound stator is arranged, and the permanent magnet rotor is arranged within the stator and a hollow-cylindrical region of the containment shell. Particle accumulations in the region between the containment shell and the permanent magnet rotor cannot occur or can only occur to a very minor extent and that the consequences of impurities in the wet chamber are reduced in order to prevent premature wear or a blockage of the centrifugal pump.

The invention relates to a micromotor (10), the stator of which contains a back iron jacket (18). Said back iron jacket consists of a continuous unslotted sleeve consisting of a metal alloy that contains ferritic iron as the main constituent, up to 30% chromium and preferably aluminium and yttrium oxide. Electric conductivity is reduced by the oxidation of the aluminium. The yttrium oxide performs the same function. The reduced electric conductivity suppresses eddy currents to a great extent. The back iron jacket (18) has a high magnetic conductivity with a small wall thickness, thus increasing the electrical output for a motor with a small diameter.

An electric compressor is disclosed. An electric compressor includes an oil separating member to effectively separate oil mixed in a compressed refrigerant. The oil separating member includes a compression guide part and an exhaust guide part. The oil mixed in the compressed refrigerant is separated by colliding with the compression guide part and the exhaust guide part. The compression guide part and the exhaust guide part form a refrigerant exhaust passage. The exhaust passage may have a diversified shape, such as a zigzag shape or a maze shape. The oil mixed in the compressed refrigerant is separated by its own weight while flowing through the exhaust passage. Accordingly, oil separation efficiency of the electric compressor can be improved.

An electric fluid pump for a motor vehicle includes a housing composite, a pump unit, a drive motor, a rotor shaft, and a motor controller which controls the drive motor. The housing composite defines a pump space, which includes a pump rotor space wherein a pump rotor of the pump unit is arranged, and a motor space wherein the drive motor is arranged, which together comprise a common end wall. The drive motor includes a motor stator, a motor coil arrangement, and a motor rotor. The rotor shaft co-rotatably connected to the motor rotor, and is arranged through the common end wall to rotate jointly with the pump rotor. The common end wall is a mounting wall part on which at least the motor controller is arranged. The motor coil arrangement is arranged on the motor stator and is provided on a side which is opposite to the motor controller.

Systems and methods for producing hydrocarbons from a subterranean well include an electrical submersible pump assembly with a motor. The motor has a motor housing and a stator is located within the motor housing. The stator has a stator body with an interior cavity. A rotor assembly is located within the interior cavity of the stator. The rotor assembly includes a rotor shaft, a rotor member, and an intermediate rotor bearing assembly. The rotor member and the intermediate rotor bearing assembly circumscribe the rotor shaft. The rotor shaft extends along the central axis of the stator. A liner is located along an interior surface of the interior cavity, the liner being a thin walled member that is secured to the motor housing and seals the stator body from a wellbore fluid. The liner has a polygonal cross section.

A kind of an energy-saving and endurable auto electric water pump, including fixed support, electrical connector, rear cover of motor, controller assembly, motor assembly, isolation sleeve, impeller assembly and pump head housing, and the said fixed support and said electrical connector are set on the outer end surface of the rear cover of the motor, the controller assembly is mounted on the inner end face of the rear cover of the motor, and rear cover of the motor is mounted together with the motor assembly, the said impeller assembly is installed together with the isolation sleeve through rotating axis, while the water-cooling mechanism is set on the controller assembly. In the present invention, the water cooling mechanism is set on the controller of the electric water pump, which can effectively reduce the temperature of the controller and improve the service life of the pump.

Systems and methods for maintaining a desired differential pressure between a cooling oil of an electric motor and a process gas working fluid of a compressor connected axially to the electric motor. The cooling oil acts as a coolant for the motor compartment of the electric motor and the gas working fluid acts as a coolant for the rotor compartment of the electric motor. At least one bellow is configured to provide two sealed compartments in a pressure equalizer and a spring means is configured to add a differential pressure to the cooling oil, assuring no leaks between the two fluids flows from the cooling oil to the process gas working fluid and no contact of the process gas working fluid with the electric motor stator, in particular electric motor laminations and electric motor windings.

A pump assembly (1) includes a rotor axle (45) extending along a rotor axis (R), an impeller (12) fixed to the rotor axle (45), a pump housing (11) accommodating the impeller (12), and a drive motor with a stator (17) and a rotor (51). The rotor (51) is fixed to the rotor axle (45) for driving the impeller (12). A rotor can (57) accommodates the rotor (51). The rotor can (57) includes a rotor can flange (63). An electronics housing (13) has a cap (21) including a first material (139) forming a front face (19) of the cap (21). The front face (19) extends essentially perpendicular to the rotor axis (R). The first material (139) is at least partially overmolded with a second material (141) at an inner side of the cap (21). The second material (141) is more heat-conductive than the first material (139).