Abstract: An electric pump uses an inner-rotor type, brushless DC motor. A casing of the electric pump is formed by a pump casing and a main casing. A sensor-stator assembly is disposed in a space between a side wall portion of the main casing and a can and is sealed with resin. A first elastic seal member is disposed, in a fluid-tight manner, between the can and the main casing. A second elastic seal member is disposed, in a fluid-tight manner, between the pump casing and the main casing. In this condition, the pump casing and the main casing are fixed together.

Abstract: A fan (100) has an electronically commutated drive motor (ECM 52) with a stator (50) connected to a bearing tube (54) and a rotor (22) on a shaft (34). The shaft (34) is journaled in the tube (54) using passive radial magnetic bearings (16, 18) to minimize friction and wear, is axially displaceable with respect to the tube (54), and is drivingly connected to a rotor magnet (44) forming a first magnetic yoke (46). A second magnetic yoke (27) is connected to the shaft (34), and has an inner surface (59) defining a substantially cylindrical air gap (57) through which, during operation, a radial magnetic flux (55?) extends. A plunger coil (64) extends into the air gap (57) and is mechanically connected to the tube (54) so that, upon axial displacement of the plunger coil (64), the position of the shaft (34) with respect to the tube (54) changes.

Abstract: A rotating shaft is supported by journal bearings that can support without contacting the rotating shaft itself. Then, one end of both shaft end portions of the rotating shaft has a main impeller installed and the other end is provided with a sub impeller. By utilizing a force being generated by rotation of the main impeller, liquid being pumped (fluid being pumped) is sucked in through a suction port and discharged through a discharge port. On the other hand, by utilizing a force being generated by rotation of the sub impeller, fluid is transported to the journal bearings, thereby having the journal bearings support the rotating shaft.

Abstract: A well pump assembly has a rotary pump with an electrical motor that contains a motor lubricant. A thrust chamber is mounted between the motor and the pump, the thrust chamber containing a thrust chamber lubricant. Seals prevent the entry of thrust chamber lubricant into the motor chamber. A pressure equalizing chamber is mounted to the motor for admitting well fluid. A first pressure barrier in the equalizing chamber equalizes the pressure of the thrust chamber lubricant with that of the well fluid. A second pressure barrier contained within the first pressure barrier equalizes the pressure of the motor lubricant with thrust chamber lubricant.

Abstract: The air cycle refrigerating/cooling system compresses air that has flown in with a compressor (6) in a turbine unit (5) and adiabatically expands the air with an expansion turbine (7) in a turbine unit (5). In the turbine unit (5), a compressor rotor (6a) of the compressor (6) and a turbine rotor (7a) of the expansion turbine (7) are attached to the same main shaft (13), the main shaft (13) is supported by bearings (15) and (16) so as to be freely rotatable, and part or the entirety of the thrust force applied to this main shaft (13) is supported by an electromagnet (17).

Abstract: A balance shaft function may be realized without employing a balance shaft, when an oil pump includes an inner rotor fixed to the rotation shaft and an outer rotor that rotates with the inner rotor if at least one rotor of the inner and outer rotors has a mass center formed apart from a rotation center.

Abstract: A non-electric drive mechanism connectable to a submersible pump for pumping a fluid from a wellbore to the surface, the drive mechanism including a shaft rotatably disposed within a housing, the shaft operationally connectable to the submersible pump, at least one fan connected to the shaft and a supply manifold positioned to pass a pressurized fluid across the at least one fan in a manner to rotate the fan and the shaft.

Abstract: A pump end assembly has a centrifugal pump and a motor separated by a chamber. The chamber contains a thrust bearing as well as an intake for the pump. Fluid flowing into the intake flows through the thrust chamber and to the inlet of the pump. Some of the fluid also flows through the thrust bearing for lubricating the thrust bearing.

Abstract: A dynamic balancer for a prime mover, such as an internal combustion engine, with at least one balance shaft driven by the crankshaft of the engine, the at least one balance shaft. The pressure generator creates an output signal of pressurized working fluid whose pressure is speed-related. In one embodiment, the speed related pressure signal is applied to a device outside the balancer via a suitable the invention, a working fluid pump is also driven by at least one of the balance shafts of the dynamic balancer and the speed-related pressure signal is applied to the working fluid pump to control its output.

Abstract: Vane, fin, and hole arrangements establish a predetermined reduced swirl at the inlet of mechanical seals and the inlet of a variable axial orifice gap which act in harmony as an axial thrust equalizing system for use in liquid cryogenic turbines and pumps. In said establishment the stiffness, damping, and inertia in said seal in conjunction with said variable orifice gap is manipulated, including the destabilizing cross-coupled stiffness which is reduced. Said seal is of either labyrinth annular type formed by a plurality of teeth, annular smooth, or a plurality diamond annular surface pattern. Said variable orifice gap is smooth. Liquid for the axial thrust equalizing seal is initially bled from the main to pass through a preset deswirl mechanism. The deswirl mechanism consists of either a plurality of vanes, fins, grooves, or circular holes that guide liquid radial inward before passing through said mechanical seal.

Abstract: The rotary system (2), object of the present invention, is composed of a motoreducer assembly, which is coupled to a rotating shaft (5), through a pulley transmission system. At the lower part of the rotating shaft (5) the submerged pump (1) will be set.

Abstract: A thrust section for use above a motor preferably includes a housing, a thrust shaft, a thrust runner connected to the thrust shaft, a thrust bearing connected to the housing, and a motor lead guard. The motor is preferably positioned above a pump assembly. The thrust runner and thrust bearing prevent upward movement of the shaft.

Abstract: A turbomachine has a housing and a rotor mounted radially and axially in the housing. The rotor has a shaft and at least one impeller attached to the shaft. Two tilt-segment bearings having tilt segments, which bearings act in opposite directions, are provided for axial mounting of the rotor. The bearings interact with an assigned contact surface of the shaft. At least one of the tilt segments has a force measurement device for direct detection of the axial force acting on the assigned tilt segment. The force measurement devices are connected with an electronic control device.

Abstract: Pump with electric motor, immersed in the fluid to be pumped Circuits for the auxiliary circulation of fluid in the pump for the axial balancing and the cooling of specific portions of the pump. The pump comprises a centrifugal region (28) with a fluid axial balancing system (60) and the supply circuit of this balancing system is independent of the or each fluid cooling circuit (90, 50, 48, 52, 86) of specific elements of the pump such as the motor (16) and/or a rolling bearing (38).

Abstract: A blood pump device comprises a housing having a blood inflow port and a blood outflow port, an impeller having a magnetic body or bodies and rotated in a non-contact state in relation to the inside surface of the housing to feed blood, an impeller rotating torque generating section for attracting the impeller from the outside of the housing and rotating the impeller, and a non-contact type bearing mechanism enabling the rotation in the non-contact state of the impeller inside the housing. An impeller fixing member is detachably mounted to the housing and prevents the impeller from moving inside the housing, whereby the impeller can be prevented from moving inside the housing before use, and damage to the impeller or the housing inside surface can be avoided.

Abstract: A blood pump has an impeller rotatably disposed and magnetically suspended within a cavity of a stator by a plurality of magnetic bearings (passive permanent and active electromagnetic) having impeller magnets on the impeller and stator magnets or coils/poles on the stator. A motor includes impeller magnets on the impeller and coils/poles associated with the stator. A single, annular blood flow path extends axially through the cavity between the impeller and the stator, and between the impeller magnets on the impeller and the stator magnets or the coils/poles on the stator.

Abstract: A rotor and bearing system for a turbomachine. The turbomachine includes a drive shaft, an impeller positioned on the drive shaft, and a turbine positioned on the drive shaft proximate to the impeller. The bearing system comprises one gas journal bearing supporting the drive shaft between the impeller and the turbine. The area between the impeller and the turbine is an area of increased heat along the drive shaft in comparison to other locations along the drive shaft. The section of the drive shaft positioned between impeller and the turbine is also a section of the drive shaft that experiences increased stressed and load in the turbomachine. The inventive bearing machine system positions only one radial bearing in this area of increased stress and load.

Abstract: The present invention provides a thrust bearing assembly and a horizontal skid utilized in a horizontal pumping system. In one embodiment, the thrust bearing assembly comprises a cylindrical open housing, at least one radial ball bearing, at least one rotating seal, and at least one axial thrust bearing. The axial thrust bearing does not have to be completely submerged in lubricant.

Abstract: The invention concerns an exhaust gas turbocharger (1) having a shaft (2) on which a turbine wheel (4) and a compressor wheel (3) sit and which is guided in radial bearings (5, 6) and in at least one axial bearing (9), which is characterized in that the radial bearings (5, 6) are embodied as passive magnetic bearings having permanent magnets (23 through 31) generating axial magnetic fluxes; and the axial bearing (9) is embodied as an active magnetic bearing having an electromagnet (55), an axial sensor, and a controller for controlling the electrical current impinging upon the electromagnet (55).

Abstract: A blood pump has an impeller rotatably disposed and magnetically suspended within a cavity of a stator by a plurality of magnetic bearings including an axial bearing to support the impeller axially in the cavity. The axial bearing includes adjacent impeller magnets and adjacent stator magnets with axially aligned polarities and reverse polarities with respect to adjacent magnets. A motor includes impeller magnets on the impeller and coils and poles associated with the stator. Radial permanent magnet and electromagnetic bearings are also included. The magnetic bearings and the motor have stator magnets or coils and poles disposed radially across the fluid passage from corresponding impeller magnets to define an annular gap positioned radially between the impeller and the stator, and positioned radially between all of the plurality of magnetic bearings, creating a straight through blood path without secondary flow paths.

Abstract: This invention provides a small, high efficiency, oil free motor driven compressor/blower suitable for providing pressurized, contamination-free gas and or air to transportation, industrial and aerospace fuel cell systems or other contaminant-intolerant applications. The motor driven compressor/blower rotor assembly is supported by foil air bearings and rotates at high speed by using a high frequency drive. The impeller is a centrifugal type design. The MDC can be easily integrated into the air management system of a fuel cell.

Abstract: A vertically-disposed pump shaft is supported by an upward force against the pump shaft during periods of non use of the pump thereby off-loading bearings normally supportive of the shaft to prevent damage thereto when the pump is moved. Additionally, a lateral support is provided at a lower end of the pump to prevent lateral movement while permitting axial movement, thereby reducing stresses against the pump housing and other components.

Abstract: A two-stage compressor for generating necessary pressure differential for air-conditioning applications with air-cooled, water-cooled and evaporative-cooled condensing systems using low-pressure refrigerant, such as R134a, is provided. A rotating assembly is mounted for rotation in a compressor housing and includes a shaft, a thrust bearing disk associated with the shaft to maintain an axial position of the rotating assembly, a motor rotor mounted on the shaft, and first and second impellers mounted for rotation with the shaft. First and second journal bearings are mounted in the compressor housing to support the shaft and maintain radial positioning of the rotating assembly. Volute housings including a spiral-shaped volute are associated with each of the impellers to collect and further discharge gas compressed by the impellers. Diffusers having air-foil shaped vanes are locate in the volute channels adjacent the discharge outlets of the impellers to aide in the discharge of gas from the impellers.

Abstract: The invention relates to a cleaning composition suitable for manually cleaning substrates. The composition comprises at least two immiscible liquid phases having one liquid-liquid interface with an interfacial tension of more than 5 mN/m, the difference in density between the two liquid phases being not more than 0.2 g/cc. After agitation, the composition is applied to the substrate to be cleaned, and subsequently friction is applied to the substrate. The composition provides for the required stability after agitation, and gives good detergency, particularly as regards particulate soil.

Abstract: A rotor (12) is mounted in a stator (14) with radial magnetic bearings (16, 19) and with an axial magnetic bearing (40) in a contactless manner. The axial magnetic bearing (40) produces an axial magnetic field with a magnet coil (40) and a yoke iron (44) mounted on the stator (14). An axially magnetized permanent magnet (50) is provided on the rotor (12), located approxaimately axially opposite the yoke iron (44). A permanently axially magnetized compensating magnet (54) is provided on the stator (14) and arranged axially opposite the permanent magnet of the rotor (50) and polarized in the opposite direction, such that the permanent magnet (50) of the rotor and the compensating magnet (54) repel each other. In a center position, the rotor is bias-free by compensating the forces of attraction between the permanent magnet of the rotor and the yoke iron. As a result, the center position of the rotor can be adjusted with relatively small magnet coil flows.

Abstract: An apparatus and method suitable for use in a reverse osmosis system has a process chamber having a feed inlet, a low pressure outlet and a high pressure outlet. A feed pump is used to increase the feed pressure to process the process chamber. A common shaft having rotatably coupled thereto a booster pump fluidically coupled between the feed pump and the feed inlet and an energy recovery turbine fluidically coupled to the high pressure concentrate outlet. The energy recovery turbine drives the booster pump.

Abstract: An oil pump for a scroll compressor has a bearing hub with a vent disposed between at least one fluid inlet in the bearing hub and a thrust washer. The vent provides an additional fluid flow path to equalize fluid pressure underneath the thrust washer. By minimizing or eliminating low fluid pressure zones with the bearing hub, fluid flow through the oil pump can be maintained at a constant level.

Abstract: A compressor in which an electric motor and a compressing mechanism are accommodated in a case, a main shaft and an auxiliary shaft of a rotating shaft of the motor are supported by a radial plain bearing and a rolling bearing with a predetermined clearance given to the rotating shaft in an axial direction, a flange portion that contacts with a main-shaft receiving member of the radial plain bearing to align the rotating shaft with the compressing mechanism is provided on the main shaft, and preload toward the side of the rolling bearing is given to the rotating shaft. In this constitution, a prevention member for preventing contact and/or collision of the rotating shaft with the main-shaft receiving member is provided between opposing faces of the flange portion and the main-shaft receiving member.

Abstract: A pump apparatus of simple construction has a bearing structure for which a lubricant is unnecessary. A flow passage for a refrigerant (liquid ammonia) is formed in a housing to provide communication between a suction port and a discharge port, and slide bearing members formed of amorphous carbon are provided in the housing to be fitted into the flow passage to support a rotating shaft. A drive for rotating the rotating shaft is constituted by a rotor, which is fitted into the flow passage and provided with the rotating shaft, and a stator, which is provided outside the housing to surround the rotor, and a pump body is provided midway the flow passage and connected to the rotating shaft to pump a fluid.

Abstract: A system for cooling a turbo compressor includes two compressing parts on opposite ends of a rotational shaft driven by a motor. Fluid from a fluid chamber within the casing of the device is supplied to a bearing chamber when the temperature of the bearing chamber increases. A supply passage is formed in a first support where the radial bearing for supporting a load in the axial direction is formed. The open-and-shut valve supplies fluid when the temperature of the bearing chamber increases.

Abstract: The present invention relates to compounds useful in the treatment of cancer or other proliferative diseases represented by formula I: wherein: Q is selected from the group consisting of M is O, NR9, or CR10R11; X is O or NH; and the R groups are as defined, and therapeutic compositions containing them alone or in combination with other therapeutic agents useful in the treatment of cancer or other proliferative diseases.

Abstract: This invention provides a small, high efficiency, oil free motor driven compressor/blower suitable for providing pressurized, contamination-free gas and or air to transportation, industrial and aerospace fuel cell systems or other contaminant-intolerant applications. The motor driven compressor/blower rotor assembly is supported by foil air bearings and rotates at high speed by using a high frequency drive. The impeller is a centrifugal type design. The MDC can be easily integrated into the air management system of a fuel cell.

Abstract: The present invention provides a thrust bearing assembly and a horizontal skid utilized in a horizontal pumping system. In one embodiment, the thrust bearing assembly comprises a cylindrical open housing, at least one radial ball bearing, at least one rotating seal, and at least one axial thrust bearing. The axial thrust bearing does not have to be completely submerged in lubricant.

Abstract: A screw compressor 1 comprises a screw compressor body 2 having a pair of female and male screw rotors 21 meshed with each other encased in a rotor casing 22, and a motor casing 4 having a motor 3 for driving a male rotor 21b of the screw rotor 21 encased therein. The screw compressor body 2 and the motor casing 4 are connected integrally. The male rotor 21b and the motor 3 are connected by a common rotor shaft 23. In the common rotor shaft 23, the counter motor 3 side is supported by a rolling bearing and a projecting end of the motor 3 is supported by a rolling bearing 7 on the motor side, and a portion between the motor 3 and the screw rotor 21 is supported by an intermediate rolling bearing 6.

Abstract: A turbo-machine includes a housing (1); a rotor (3) of a centripetally flow-through expansion turbine stage (4) overhung on the one end of the rotor shaft; a rotor of a radially flow-through compressor stage (6) overhung on the other end of the rotor shaft; a measuring system (7) for directly detecting an axial thrust of the rotor shaft (2) supported in roller bearings (8); and at least two pressure control valves (10, 11), which are installed in control lines (12, 13) and controlled by a controller (9). Via the control lines (12, 13), a rotor piston surface (14), which is sealed against the housing (1) and located on the rear side of one of the rotors, for example the compressor rotor (5), can be acted upon by the pressure (p1) prevailing on the inlet into the compressor stage, and the pressure (p2) on the outlet of the compressor stage (6).

Abstract: An apparatus for protecting a fluid pump motor includes an electric motor for driving a pump head to pressurize a fluid. A liner is positioned in the motor air gap to prevent pressurized fluid from contacting one or more magnetic field producing elements of the stator. The liner includes a thin wall to minimize the air gap distance. The liner wall is made thin enough that, under loading of the pressurized fluid, the liner wall deforms and bears against one or more of the field producing elements of the stator for structural support. The liner is preferably fabricated as a single metal part using a deep drawing process that results in a can having opposed open and closed ends with a substantially uniform cross-section between the open and closed ends of the can.

Abstract: A shaft load balancing system includes a housing divided into a first chamber at a first operating pressure and a second chamber at a second, lower operating pressure. A shaft passes from the first chamber into the second chamber. The shaft includes a first end in the first chamber, a second end in the second chamber, and a substantially axial channel connecting the first end and the second end. The first end is in fluid communication with a fluid reservoir in the housing. A reaction member engages the second end. The reaction member includes a compression volume in fluid communication with the channel. A pressure differential between the chambers forces fluid from the fluid reservoir through the channel and into the compression volume. The reaction member transmits the fluid force to the housing, allowing the fluid to create a force on the second end of the shaft.

Abstract: A magnet pump with bi-directional axial self-alignment comprises an inner chamber (12), provided with a suction duct (13) and a delivery duct (14); an impeller (25) located in said chamber (12) in a rotatably and axially movable manner, and having, a front portion (26) oriented towards the suction duct (13); a driven rotor (31) integral with the motor spindle (51), located outside said chamber (12) and bearing magnets (34) cooperating with as many driven magnets (35) facing the same, located in the rear portion (27) of impeller (25), and a magnet (41) fixed in the inside of said chamber (12) and cooperating with a second magnet (42), incorporated in said impeller (25) so as to realize a linear magnetic coupling.

Abstract: Provided is a connecting structure for a vacuum pump, which can block propagation of electrical noise, generated by a main body of the vacuum pump. Between both ends of a connection piping for connecting the vacuum pump to a vacuum chamber of an apparatus to be connected with and evacuated by the vacuum pump, there is interposedly provided an electrical insulating portion formed of an insulating material so as to provide electrical insulation therebetween. The electrical insulation portion may be provided to a connection piping member such as a damper (or a valve depending on the connection arrangement) for absorbing mechanical vibrations.

Abstract: A turbo-compressor having a housing and at least one rotor shaft pivotably supported in the housing, with a free shaft end and with a rotor connected with the other end of the rotor shaft. The free end of the rotor shaft facing away from the rotor projects into a pressure chamber connected with the housing, and is acted upon by a pressurized fluid whose force of pressure compensates for the force of the axial thrust acting on the rotor. Thus, the starting friction of the compressor is lower and drive motors of lower output target can be utilized.

Abstract: A turbo-machine includes a housing (1); a rotor (3) of a centripetally flow-through expansion turbine stage (4) overhung on the one end of the rotor shaft; a rotor of a radially flow-through compressor stage (6) overhung on the other end of the rotor shaft; a measuring system (7) for directly detecting an axial thrust of the rotor shaft (2) supported in roller bearings (8); and at least two pressure control valves (10, 11), which are installed in control lines (12, 13) and controlled by a controller (9). Via the control lines (12, 13), a rotor piston surface (14), which is sealed against the housing (1) and located on the rear side of one of the rotors, for example the compressor rotor (5), can be acted upon by the pressure (p1) prevailing on the inlet into the compressor stage, and the pressure (p2) on the outlet of the compressor stage (6).

Abstract: An electric motor pump with axial-flow impellers includes an electric motor having an output shaft both end portions of which are connected to axial-flow impeller units, and a pair of pump housings provided on both sides of the motor in the longitudinal direction of the output shaft and including fluid inlet and outlet ports, the pump housings cooperating with the impeller units to suck fluid into the housings through the inlet ports, move the fluid in the longitudinal direction and discharge the fluid from the outlet ports, thrust forces applied to the output shaft by the impeller units are canceled.

Abstract: A screw compressor having balanced axial thrust includes a housing having a fluid inlet and a fluid outlet; a rotor disposed in the housing for receiving low pressure fluid from the inlet and discharging increased pressure fluid from the outlet, the rotor having a discharge end and a motor end; a balance piston arranged to exert a balancing force on the motor end of the rotor; and a conduit for conveying a high pressure fluid to the balance piston so as to exert the balancing force.

Abstract: A hermetic compressor assembly including a housing having mounted therein a motor and a compression mechanism which are operatively coupled by a drive shaft. The drive shaft is rotatably received in a bearing mounted in the housing. Engaging means are provided in the drive shaft and the bearing to prevent relative movement between the compression mechanism and the drive shaft in both directions along the drive shaft axis of rotation. The engaging means includes a circumferential groove provided in the drive shaft, a bore located in the bearing, and a retaining element may be in the form of a ball or an elongate pin. The circumferential groove and the bore are aligned and each receive a portion of a retaining element to prevent axial movement of the drive shaft.

Abstract: A hermetic compressor assembly including a housing having mounted therein a motor and a compression mechanism which are operatively coupled by a drive shaft. The drive shaft is rotatably received in a bearing mounted in the housing. Engaging means are provided in the drive shaft and the bearing to prevent relative movement between the compression mechanism and the drive shaft in both directions along the drive shaft axis of rotation. The engaging means includes a circumferential groove provided in the drive shaft, a bore located in the bearing, and a retaining element may be in the form of a ball or an elongate pin. The circumferential groove and the bore are aligned and each receive a portion of a retaining element to prevent axial movement of the drive shaft.

Abstract: A circulation fan apparatus including a hermetic vessel 1 containing a corrosive process gas therein, and a circulation fan 2 installed in the hermetic vessel, rotors 2-1, 2-2 of the circulation fan are rotatably supported by bearings, wherein the bearings comprises control-type radial magnetic bearings 4, 5 and at least control-type axial magnetic bearing 6, 7, displacement sensor targets 4-1, 5-1, 6-1, and 7-1 and rotor-side magnetic poles 4-2, 5-2, 6-2, and 7-2 of radial magnetic bearings 4 and 5 and axial magnetic bearings 6 and 7 are fixed to the rotors 2-1 and 2-2 of the circulation fan 2 and are disposed in the hermetic space communicating with the hermetic vessel, and displacement sensors 4-3, 5-3, 6-3, and 7-3 and stator-side magnetic poles 4-4, 5-4, 6-4, and 7-4 opposing the displacement sensor targets and rotor-side magnetic poles are disposed outside of the hermetic vessel with cans 14, 15, 17, and 18 interposed therebetween, whereby even when the circulation fan 2 is rotated at a high speed and u

Abstract: A screw compressor having balanced axial thrust includes a housing having a fluid inlet and a fluid outlet; a rotor disposed in the housing for receiving low pressure fluid from the inlet and discharging increased pressure fluid from the outlet, the rotor having a discharge end and a motor end; a balance piston arranged to exert a balancing force on the motor end of the rotor; and a conduit for conveying a high pressure fluid to the balance piston so as to exert the balancing force.

Abstract: A pump has a housing plate, a housing can fixed to the plate and defining a chamber on a back face thereof, a bearing sleeve in the can fixed to the plate and extending rearward from the back face along an axis, and a rotor shaft extending axially through the sleeve. Bearings support the rotor shaft in the sleeve and an impeller is carried on the rotor-shaft front end. A rotor body fixed to the shaft rear end extends axially forward in the can around the bearing sleeve. The rotor body defines an annular space around the bearing sleeve and is formed with at least one axially throughgoing passage open axially forward into the space and axially rearward into the can. A vane in the passage is angled for pumping liquid from inside the can axially forward into the space on rotation of the rotor about the axis.

Abstract: The invention relates to a method for generating over-pressure gas by means of a kinetic compressor which is coupled to a high-speed electric machine located on the same shaft with the compressor and comprising a rotor whose rotational speed is over 20,000 rpm. The compressor is provided with at least two stages. The shaft of the rotor is mounted on a magnetic and/or gas bearings, and the high-speed electric machine is placed centrally on the shaft with respect to the compressor stage of the compressor. The rotor is mounted on a magnetic bearing at least in the axial direction, and the ends of the rotor are used at least partly as counter surfaces for the axial magnetic bearing.

Abstract: A water-cooled pump motor for delivering potable water in a demand system includes a centrifugal pump including a volute and an impeller in the volute, an electric motor driving the impeller having a hollow rotor shaft, a rotor on the shaft, bearings supporting the rotor shaft, a stator coaxially outward of the rotor, two water impervious liners, one located within the stator and the other coaxially outside the rotor, the liners being spaced to define a cylindrical passageway across the rotor and a cooling and lubricating water passageway for water to flow through the motor including flow from the impeller between the rotor shaft and the bearings, across the cylindrical passageway and through the hollow rotor shaft back into the volute.