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.

An electric coolant pump is used as an auxiliary water pump in a vehicle. The pump includes radial mounting of the shaft (4) is provided by means of a coolant-lubricated radial sliding bearing (41) arranged between the pump impeller (2) and the rotor (32). A dry-running electric motor (3) with a radially inner stator (31) and a radially outer rotor (32) is accommodated in a motor chamber (13) separated from the pump chamber (10). A shaft seal (5) is between the radial sliding bearing (41) and the motor chamber (13). The rotor (32) is bell-shaped with an inner surface facing the shaft seal (5) and being fixed to the shaft seal (5) to axially overlap with the shaft (4). The motor chamber (13) has an opening to the atmosphere, which is closed by a liquid-tight pressure equalization membrane (6) that is permeable to vapor.

An electrical coolant pump, preferably for use as an additional water pump in a vehicle, is characterised in that a radial bearing of the shaft, which is arranged between the pump impeller and the rotor, is provided by means of a radial sintered sliding bearing having a defined porosity lubricated by coolant, and a shaft seal is arranged between the radial sliding bearing and the motor chamber, wherein at least one coolant flow channel with a predetermined depth is provided in the sintered sliding bearing in an axial direction extending from the end of the sintered sliding bearing on the side of the pump chamber.

In a rotary direct-drive single-stage or multi-stage centrifugal pump (1) for cryogenic liquids, having a pump housing (2) for the pump (1) and an electric drive motor unit (12) in a motor housing (10) serving as a pump drive, wherein a shaft (11) of the drive motor unit (12) is mounted on two roller bearings (20; 21), and wherein at least one roller bearing (20; 21) is an unlubricated roller bearing, the structural design of the centrifugal pump (1) should be kept as simple as possible. This is achieved in that at least a first communicating connection, in particular a direct connecting channel (16), is configured between the pressure side (D) in the pump housing (2) and the roller bearing (21) on the pump housing side for a diverted part (F.sub.A1) of the main conveying flow (F.sub.H) of the cryogenic pumped medium to the roller bearing (21), and that a second communicating connection is configured between the roller bearing (21) on the pump housing side and the suction side (S) for the diverted part (F.sub.A2) of the cryogenic pumped medium back to the suction side (S) in the main conveying flow (F.sub.H) of the cryogenic pumped medium, so that a circulation of the diverted part (F.sub.A1, F.sub.A2) of the cryogenic pumped medium is ensured between the pressure side (D) in the pump housing (2) and only the roller bearing (21) on the pump housing side.

The disclosure provides a magnetically driven pump which including a base, a spacer sleeve, a cover, a stator assembly and a rotor assembly. The base has a first accommodation space. The spacer sleeve is mounted to the base and partially located in the first accommodation space. The spacer sleeve has a second accommodation space not connected to the first accommodation space. The cover has through holes. The cover is mounted to the base, and the through holes are connected to the second accommodation space. The stator assembly is sleeved on the spacer sleeve and located in the first accommodation space. The rotor assembly includes a shaft, an impeller and a magnet assembly. Two ends of the shaft are rotatably disposed on the cover and the spacer sleeve, the shaft is partially located in the second accommodation space, and the impeller and the magnet assembly are fixed on the shaft.

A stator for a downhole-type motor includes a housing. The housing includes a sleeve. The sleeve includes a first layer, a second layer, and a third layer. The first layer is erosion-resistant. The second layer is corrosion-resistant. The third layer can provide structural support. The stator includes a motor stack. The stator can be used to drive a rotor disposed within an inner bore of the housing.

A pump assembly (1) includes an impeller (12) with a rotor axis (R), a pump housing (11) accommodating the impeller (12), a drive motor with a stator (14) and a rotor (51) for driving the impeller (12). A rotor can (57) accommodates the rotor (51), and a stator housing (13) accommodates the stator (14). The rotor can (57) includes a rotor can flange (63) having a lateral rotor can flange face (87) fitting within a peripheral wall (69) of the pump housing (11). The lateral rotor can flange face (87) has at least three radial projections (91) abutting against the peripheral wall (69) of the pump housing (11) and centering the rotor can (57) with respect to the peripheral wall (69) of the pump housing (11).

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.

A combined pump and motor has a stator mounted for non-rotation in a housing. The stator has windings that create an electromagnetic field in the stator cavity when powered. An upper diffuser and a lower diffuser are mounted for non-rotation in the stator cavity. Annular clearances exist between the upper diffuser and the inner diameter of the stator and between the lower diffuser and the inner diameter of the stator. An impeller between the lower diffuser and the upper diffuser has an array of magnets circumferentially mounted around the impeller that impart rotation to the impeller in response to the electromagnetic field in the stator cavity. The array of magnets has at least one end portion extending into one of the upper and lower diffuser annular clearances.

A motor assembly includes a rolling bearing installed on a rotation shaft between an impeller and a rotor to support a first support of the rotation shaft, and a motor housing having a stator. The motor housing has a gas bearing bracket for accommodating a second support of the rotation shaft disposed at a side opposite to the first support with respect to the rotor. The motor assembly includes a gas bearing assembly in the gas bearing bracket to support rotation of the second support of the rotation shaft. The gas bearing assembly includes a gas bearing for surrounding the second support. The gas bearing is spaced apart from the second support of the rotation shaft to define a gap therebetween when the rotation shaft rotates. The gas bearing assembly includes an elastic member interposed between the gas bearing bracket and the gas bearing to elastically support the gas bearing.