Abstract: A submersible pump support rod stabilizing device includes: a submersible pump, an upper support rod, a lower support rod, etc. The upper part at the one side and the lower part at the other side of the submersible pump have upper support rods and lower support rods respectively, and the upper and lower support rods have bends towards the side of the submersible pump and a small section of the rod head. This small section of the rod head has a circular ring above it, the rod head has an inclined edge and a section of rope. The two ends are respectively fixed on the circular rings of the upper and lower support rod heads at the one side of submersible pump, the rope has wheels, and the other digging rope is hauled upward by the wheel and the other end of the digging rope is fixed at the wellhead.

Abstract: A bulkhead penetrator comprising a body having an interior and an exterior. An element having a first pressure is disposed within the body's interior in a first pressure region. An inner penetrator is configured to permit a transfer of the element from the body's interior past the physical boundary to the exterior of the body in a second pressure region having a second pressure, the inner penetrator having an interior surface exposed to the first pressure region and an exterior surface exposed to the second pressure region. An outer penetrator is configured to permit the transfer of the element from the interior of the body past the physical boundary to the exterior of the body in a third pressure region having a third pressure. An inner-outer connector connects the inner penetrator to the outer penetrator. Sealing mechanisms may prevent the transfer of the element from the first pressure region.

Abstract: An engine using centrifugal pumps to form a centrifugal multistage reverse compressor with flow alternating inward and outward in series. It is fed, at either the periphery or the center of one of the pumps, by either compressed then heated air or by products of combustion. This invention also includes a set of related inventions, comprising a group of flow guides to convert radial flow to axial flow and a group to convert axial flow to radial flow and the combination of those flow guides. The invention also includes a multistage centrifugal compressor using combinations of centrifugal pumps with alternating pumps having inward flow of gas traveling from the periphery to the vicinity of the axle and having outward flow of gas traveling from the vicinity of the axle to the periphery. The invention also includes the using the above in an external heat engine or heat pump.

Abstract: A two chamber heat transfer unit configured such that hazardous air can circulate through one of the chambers and potential ignition source components are contained in another chamber through which the gas to be heated or cooled will circulate.

Abstract: A containment structure for an actuation unit for compact immersion pumps for wells having a box-like casing, which is fitted over an electric actuation, motor for pumps, which it encloses hermetically, a cartridge, which accommodates a driving device of the motor and has a radial space occupation that is substantially smaller than, or equal to, the radial space occupation of the casting, and quick-coupling connectors provided at a head of the cartridge and at a bottom of the casing, adapted for the quick and reversible connection of the cartridge to the casing, the connectors comprising at least one power supply connector, adapted to electrically connect the driving device to an electric power supply, with which the casing is equipped, and at least one control connector, which is adapted for the functional connection of the driving device to the motor for driving it.

Abstract: An electrical submersible pump assembly has a pump, a motor and a seal section with a labyrinth chamber. A guide tube surrounds a drive shaft in the seal section and contains lubricant in fluid communication with lubricant in the motor. The guide tube has a guide tube port adjacent the downstream end of the labyrinth chamber. A. labyrinth tube has an open inlet end in the downstream end of the labyrinth chamber and an open outlet end near the upstream end of the labyrinth chamber. The labyrinth communicates well fluid on the exterior of the seal section into the labyrinth chamber in contact with the lubricant in the labyrinth chamber. A non rotating helical blade in the labyrinth chamber encircles the guide tube, defining a helical flow path between the outlet end of the labyrinth tube and the guide tube port of the guide tube.

Abstract: A compressor assembly including a housing and a terminal box is provided. The terminal box is offset relative to the housing and coupled with the housing with angled studs.

Abstract: A submersible turbine pump (STP) comprising a manifold, a yoke assembly including a yoke sleeve integrally connected to the manifold, and a packer removably secured to the manifold is provided. The manifold includes an electrical cavity that receives electrical wiring from an external source. The yoke sleeve has a hollow interior and is integrally connected to manifold, and a first end of the yoke sleeve is within the electrical cavity. The packer includes a chamber having a yoke sleeve inlet port and an electrical conduit inlet port. The yoke sleeve inlet port receives a second end of the yoke sleeve extending from the manifold, and the electrical conduit inlet port receives an electrical conduit extending from a pump within an underground storage tank. The electrical wiring passes from the electrical cavity to the chamber through the yoke sleeve and then to the pump through the electrical conduit.

Abstract: An electric compressor includes a compression mechanism, an electric motor that drives the compression mechanism, a compressor housing that accommodates the electric motor and the compression mechanism, an inverter housing coupled to the compressor housing and including an inverter accommodation chamber that accommodates the inverter, and a sealed terminal arranged in the compressor housing. The sealed terminal electrically connects the inverter and the electric motor. The sealed terminal includes a terminal pin, which is formed from a conductive material, a terminal holder, which holds the terminal pin, and an insulative body, which insulates the terminal pin from the terminal holder. The insulative body includes a first insulative body, which is arranged in the inverter accommodation chamber and formed from a ceramic, and a second insulation body, which is arranged in the compressor housing and formed from glass.

Abstract: The present invention comprises a downhole unit that includes at least one plunger and that uses a power fluid to recover production fluid from a well. The downhole unit recovers production fluid and brings it to the surface of the well during both the downward and upward motion of the at least one plunger. The downhole unit can also optionally dispose of unwanted fluids in a formation.

Abstract: A system and methodology facilitates the supply of electrical power in a variety of harsh environments. The technique may utilize an electrical power cable having an insulator located around an electrical conductor. The insulator and the electrical conductor are positioned within a metallic tube. In a variety of applications, the metallic tube enables construction of the electrical power cable without an armor layer. A jacket is disposed between the insulator and the metallic tube and is designed to compensate for differences in thermal expansion between the materials. The jacket may be formed with gas pockets distributed therein to compensate for a different level of thermal expansion of the jacket relative to, for example, the metallic tube.

Abstract: A sealed terminal device for a motor-driven compressor has an electrically insulating terminal holder (12) to be attached to the housing wall (2a) of the motor-driven compressor, a plurality of sealed terminals (18) held in the terminal holder (12), for penetrating the housing wall (2a) with play to the housing wall (2a), and a groove (40) or cavity (38) formed in the terminal holder (12) to increase a creepage distance for insulation between the sealed terminals.

Abstract: A pumping device including a housing whose front face is at least partly formed by a block of transparent material, this block containing a number of machine-drilled holes including at least one blind hole forming a work chamber, at least one hole forming an admission and/or exhaust channel leading into the blind hole, two through channels whose orifices on the front face of the block are fitted with hydraulic hose connection means, two solenoid valves, a plunger sliding leaktightly in a bearing fitted to the orifice of the blind hole, this plunger defining with the blind hole a volume that varies as a function of the axial position of the plunger, and a module connected to the base of the plunger for moving the plunger translationally. The pumping device can be used for pipetting, dilution, rinsing and/or dispensing of samples, regardless of the envisaged volume ranges.

Abstract: The present invention relates to an electric compressor integrally including a compression mechanism and an electric motor, and an object thereof is to prevent the housing from being elongated in the axial direction and improve the sealability and the mountability of the compression mechanism. According to the present invention, a hermetic terminal (45) electrically connecting the electric motor (30) and a motor drive circuit (40) is attached within a swelled-space portion (50) swelled toward radial outside of a housing (11) so as to be continuous with a mounting bracket (17) of the housing (11). Accordingly, the distance between the compression mechanism and motor drive circuit can be shortened.

Abstract: An immersion pump assembly includes an electric drive motor and a control device (14) for controlling the drive motor, which are configured for dipping into a liquid (18) to be conveyed. An external display device (26) and/or an external communications device are/is configured for arrangement outside the liquid (18) to be conveyed and are/is connected to the control device (14) for signal transmission.

Abstract: A compressor comprising a shell, a compression mechanism disposed within the shell, a drive shaft for operating the compression mechanism, and a motor for driving the drive shaft. A terminal is secured to the shell for delivering electric current to at least one of the compression mechanism and the motor. A terminal block is engaged with the terminal, and a wire carries the electric current from the terminal and the terminal block. A wire retainer located relative to the compression mechanism supports the wire in a predetermined orientation within the shell.

Abstract: An apparatus for pumping fluids from a geologic formation comprising a submersible motor having a motor shaft, wherein said submersible motor is reversible and has a plurality of speed settings; a pump housing connected to said submersible motor by a motor mount, wherein said pump housing has a lubricant contained therein; and a tube connected to said pump housing having a pump barrel disposed therein, wherein said pump barrel has an upper barrel connector that is connected to a standing valve; whereby a reciprocating motion by a ball nut applies said lubricant on a ball screw, and associated method of use.

Abstract: An inverter-integrated electric compressor comprising a compressing mechanism portion which sucks, compresses and discharges fluid, a motor which drives the compressing mechanism portion, a body casing in which the motor is incorporated, the body casing being hermetically closed, a suction passage formed in one of ends of the body casing, and an inverter case in which an inverter for driving the motor is incorporated. At least a portion of the inverter case is closely brought into contact with and fixed to, in its axial direction, the body casing in which the suction passage is formed.

Abstract: An improved seal assembly for a downhole electrical submersible pump assembly.

Abstract: A connector for connecting electrical power to a well pump motor has cable and motor connector portions that mate with each other in a connected position. The connector portions have insulating members, each of which has a number of passages and an end face. Electrical contact members are mounted in each of the passages. Contact members in the cable connector portion protrude past the end face of the insulating member. A debris seal insulates the electrical contact members in the cable connector and includes expansion slots so that when the material of the debris seal thermally expands, the expansion slots contract in response to the expansion without the debris seal impinging against either connector.

Abstract: An electric compressor is provided with a hermetic terminal wherein the number of components and the number of steps and amount of time required for assembling the hermetic terminal and for machining the components are reduced, to thereby improve production efficiency. The hermetic terminal (41) is located in a through hole (2c) provided to a motor housing (2). A terminal main body (42) of the hermetic terminal (41) is provided with a flange portion (42b) located inside the motor housing (2) to prevent the hermetic terminal (41) from falling off to outside through the through hole (2c). Moreover, movement of the hermetic terminal (41) to an inner side of the motor housing (2) is restricted by a shaft supporting member (21) which faces thereto through a cluster block (44) interposed therebetween.

Abstract: A containment structure for an actuation unit for immersion pumps, particularly for compact immersion pumps for wells, comprising a box-like casing, which is fitted over an electric actuation motor for pumps, which it encloses hermetically, a cartridge, which accommodates a driving device of the motor and has a radial space occupation that is substantially smaller than, or equal to, the radial space occupation of the casing, quick-coupling connectors provided at a head of the cartridge and at a bottom of the casing, adapted for the quick and reversible connection of the cartridge to the casing. The connectors comprise at least one power supply connector, adapted to electrically connect the driving device to an electric power supply, with which the casing is equipped, at least one control connector, which is adapted for the functional connection of the driving device to the motor for driving it.

Abstract: An electrical submersible pump assembly has a motor cooperatively engaged with a pump for driving the pump and a motor lead extending to the motor for supplying power to the motor. The motor lead has an electrical conductor enclosed within a tube. The tube is sealed from an exterior environment of the motor and contains a dielectric fluid. The motor may be filled with a dielectric lubricant and the interior of the tube of the motor lead may be in fluid communication with the dielectric lubricant. Alternatively, the motor may filled with a dielectric lubricant and the dielectric fluid within the interior of the tube of the motor lead may be sealed from the dielectric lubricant.

Abstract: A heat-dissipating fan includes a housing having a peripheral wall defining a compartment receiving a shaft seat. The peripheral wall includes a wire-guiding slot in communication with the compartment. A base is coupled to the housing and includes a coil unit and a connection port electrically connected to the coil unit. The connection port faces the wire-guiding slot. A power line includes a first end connected to the connection port and a second end extending through the wire-guiding slot. An impeller includes a hub, a shaft mounted to the hub and coupled to the shaft seat, and a permanent magnet mounted to the hub. The permanent magnet faces the coil unit. The connection port is located on a reference line passing through the shaft seat and the wire-guiding slot. A distance between the connection port and the wire-guiding slot is shortened to enhance assembling convenience of the power line.

Abstract: The vacuum pump comprises a casing (10) closed by a vacuum cover (20). Between an end wall (14) of the casing (10) and the vacuum cover (20), a circuit board (16) is arranged for current feedthrough. The circuit board (16) is sealed by two sealing elements (15, 21) of different diameters so that an annular partial region (22) is on its outer side subjected to the atmospheric pressure and is on its inner side subjected to the vacuum. It is avoided that the circuit board (16) laterally projects beyond the contour of the casing (10).

Abstract: An electrical feedthrough assembly for providing connection to components of a compressor. The electrical feedthrough assembly includes a housing having an inner surface defining a channel. A sealed wire assembly is provided in the channel. The sealed wire assembly includes a body having an outer surface defining a groove and a plurality of wires sealingly passing through the body. An o-ring fits in the groove to provide a hermetic seal between the body and the inner surface of the housing.

Abstract: A terminal device for an electric compressor has a partition wall and a terminal member for supplying electricity to an electric motor for driving a compression mechanism. The partition wall is located between an electric motor-storing section, which stores the electric motor and in which lubricating oil-containing fluid to be compressed is present, and a circuit section for supplying electricity to the electric motor. The terminal member extends through the partition wall in a sealed and insulated manner. The terminal member is constructed as a steel bolt-like member, and an end of a lead wire for supplying electricity to the electric motor is directly connected by caulking to the end of the terminal member at the electric motor-storing section side. The terminal device can exhibit high insulation performance even if polyalkylene glycol-based oil is used as lubricating oil contained in fluid to be compressed.

Abstract: A male terminal is provided in a terminal hole formed in a flange unit. A female terminal and a grommet having a sealing portion to be fitted into the terminal hole are provided to a harness. A distance from an end of the sealing portion to a fore-end of the female terminal is set smaller than a distance from a fore-end of the male terminal to an opening of the terminal hole. With such setting, the grommet is retained in the terminal hole even if the female terminal is disconnected from the male terminal, thereby ensuring support of the female terminal. Moreover, a stopper is attached so as to cover the terminal hole to prevent the grommet from slipping out of the terminal hole.

Abstract: An improved seal assembly for a downhole electrical submersible pump assembly.

Abstract: A power line for an electrical submersible pump has three metallic impermeable tubes. A single electrical conductor is located within each of the tubes. Each conductor has at least one elastomeric insulation layer surrounding it. An annular portion of the insulation layer of each of the electrical conductors is in tight contact with the tube to form a seal. The annular portions may be annular crimps formed in the tube at intervals. The annular portion could also be a continuous seal caused by swelling of the insulation layer due to contact with a hydrocarbon.

Abstract: Implementations of an enhanced axial air mover system address various issues such as drying performance, transportability, storage, use, and assembly. Some implementations include ergonomic positioning of a carrying handle relative to positioning of a fan-assembly to make the system easier to carry. Enclosures with variable diameter profiles increase air flow performance. A floor edge allows for flush positioning of the air mover's outlet to improve flow of air. Various supports and engagement members allow for horizontal and/or vertical engagement of a plurality of the air movers for storage or increased air moving capacity for a given application. An alignment guide assists with positioning of the air mover with respect to a room wall to enhance air flow within the room. A cord retaining system provides an enhanced approach for securing the air mover's electrical cord. Grill guards have slotted ends to assist with assembly of the air mover.

Abstract: An electrical submersible well pump assembly having a pump, a pump motor, a seal section, and an intake in the head of the seal section for drawing well bore fluid into the pump assembly. A shaft extends from the motor for driving the pump, a shaft coupling is included within the intake for connecting the shaft to the pump.

Abstract: An electrical submersible pump assembly has a motor cooperatively engaged with a pump for driving the pump and a motor lead extending to the motor for supplying power to the motor. The motor lead has an electrical conductor enclosed within a tube. The tube is sealed from an exterior environment of the motor and contains a dielectric fluid. The motor may be filled with a dielectric lubricant and the interior of the tube of the motor lead may be in fluid communication with the dielectric lubricant. Alternatively, the motor may filled with a dielectric lubricant and the dielectric fluid within the interior of the tube of the motor lead may be sealed from the dielectric lubricant.

Abstract: An electric motor-driven compressor having a connector structure comprising a terminal connecting portion and a casing, the terminal connecting portion being provided with a hole for inserting an external terminal for power supply to an electric motor for driving a compression mechanism incorporated in a compressor housing, the casing covering the terminal connecting portion. In the electric motor-driven compressor, a collar is provided between a core wire and a covering material of a cable, at least a position corresponding to a sealing material provided at the cable inserting portion of the casing. The clearance between the cable and the sealing material can be prevented from increasing even when the cable is increased in temperature during power supply or when the cable is arranged in a bent fashion, and good sealing performance in the casing of the connector can be achieved, thereby enhancing reliability and durability of the electric motor-driven compressor.

Abstract: In an electric compressor, an inverter case of an inverter is externally attached to an end wall of a housing in an axial direction on the side of a suction port to a compression mechanism. An intake passage for leading fluid returned from the outside into the suction port is provided in the inverter case. The intake passage has a thermal binding portion for thermally binding the intake passage to the inverter. According to the above structure, an exclusive part in the housing is eliminated even though the inverter is installed in the electric compressor, and the inverter is cooled efficiently.

Abstract: A compressor including a shell having an aperture. A drive mechanism is disposed within the shell, and a compression mechanism is driven by the drive mechanism. A hermetic terminal assembly is provided in the aperture including a cup-shaped housing surrounded by an annular flange. The annular flange is secured to an inner surface of the shell a distance away from the aperture.

Abstract: A waterproof assembly is provided to an air blower and has a cap adapted to be securely mounted on top of the circuit board and a primary seal is adapted to be sandwiched between the motor casing and the circuit board. A through hole is adapted to be defined through a periphery of the motor casing and a tube is extendable into the through hole to allow extension of control wires. A secondary seal is sandwiched between the tube and the periphery defining the through hole and a frame is adapted to be formed on the periphery defining the through hole of the motor casing and has a step to support the primary seal. The circuit board is mounted on top of the frame to sandwich the primary seal.

Abstract: The present invention provides a submersible turbine pump (STP) comprising a check valve located within a hydraulics cavity, wherein the STP provides the ability to depressurize the hydraulics cavity by relieving a pressure differential between an inlet side and an outlet side of the check valve. In general, the STP is comprised of a casing body comprising a check valve extraction housing and the hydraulics cavity. The check valve is located within the hydraulics cavity and is comprised of a check valve stem, an inlet side, and an outlet side. The check valve extraction housing comprises a lock-down screw adapted to attach to the check valve stem and apply a force to the check valve to open the check valve, thereby relieving the pressure differential between the inlet side and the outlet side.

Abstract: A method provides wiring associated with a flange of a fuel delivery module for use in a fuel tank of a vehicle. The method includes molding a plastic flange 12 of a fuel delivery module, with the flange defining an inside region 11 and an outside region 7. At least one terminal 20? is provided that is accessible from the outside region of the flange. An electrical connection 28 is established between the at least one terminal and a wire 16?. In one embodiment, plastic material 25 is molded directly over a) the connection 28, b) at least a portion 32 of the wire 16? and c) at least a portion 34 of the terminal 20? to seal the connection, the portion of the wire, and the portion of the terminal between the inside region and outside region of the flange. In another embodiment a pre-formed plastic body encapsulates the connection 28 and the body is placed in a flange mold and plastic material is over molded to encapsulate the portion of the terminal while molding the flange.

Abstract: A supply and control device of an electric appliance equipped with a fluid-tight terminal with pin contacts, typically a compressor, including a cup-shaped support formed by electrically non-conductive material, a plurality of electric contacts of the blade type accommodated within the cup-shaped support and presenting same protruding ends facing towards a same open side of the cup-shaped support, arranged in use at an angle with respect to the fluid-tight terminal, at least one wire clamping device integral with the cup-shaped support in a position immediately adjacent to its open side and a housing for a control device arranged within the cup-shaped support, adjacent to the blade contacts and accessible only through an opening obtained through a bottom wall of the cup-shaped support facing in use towards the fluid-tight terminal; the bottom wall being further provided with corresponding holes adapted to throughly receive, in use, the pin contacts and with first mechanical coupling members mating with second

Abstract: A method provides wiring associated with a flange of a fuel delivery module for use in a fuel tank of a vehicle. The method includes molding a plastic flange 12 of a fuel delivery module, with the flange defining an inside region 11 and an outside region 7. At least one terminal 20? is provided that is accessible from the outside region of the flange. An electrical connection 28 is established between the at least one terminal and a wire 16?. In one embodiment, plastic material 25 is molded directly over a) the connection 28, b) at least a portion 32 of the wire 16? and c) at least a portion 34 of the terminal 20? to seal the connection, the portion of the wire, and the portion of the terminal between the inside region and outside region of the flange. In another embodiment a pre-formed plastic body encapsulates the connection 28 and the body is placed in a flange mold and plastic material is over molded to encapsulate the portion of the terminal while molding the flange.

Abstract: A swash plate type variable displacement compressor includes a cylinder block defining a cylinder bore. A housing is fixed to the cylinder block and defines a crank chamber. A drive shaft is rotatably supported by the housing and the cylinder block. A swash plate is supported by the drive shaft in the crank chamber and is inclinable with respect to the axis of the drive shaft. A piston is accommodated in the cylinder bore so as to define a compression chamber in the cylinder bore and is coupled to the swash plate. A control mechanism includes a bleed passage for controlling the pressure in the crank chamber. The compressor is formed such that lubricating oil in the crank chamber is discharged into at least one of the suction chamber, the discharge chamber and the compression chamber while the inclination angle of the swash plate is substantially a maximum inclination angle.

Abstract: The present invention provides a high temperature pothead used to provide power to a submersible motor. More specifically, the present invention provides a high temperature pothead that does not require elastomeric sealing elements.

Abstract: A plurality of connection terminals are covered with a housing so that the plurality of connection terminals are collectively treated by handling of the housing. The housing is put over and fitted to a case of a compressor while connecting the connection terminals to connection pins for external wiring through an opening of the housing. With a seal member arranged in between, the opening is pressed against an external face of the case to conduct sealing between them.

Abstract: An electric pump includes a cylinder, a pumping element, a cap and a spring. The cylinder defines a space and at least one aperture in communication with the space and includes a first end defining an aperture and a second end defining an opening. The pumping element is received in the cylinder for pumping air through the aperture defined in the first end of the cylinder, the space and the at least one aperture. The battery includes a first electrode and a second electrode, and is received in the cylinder so that the first electrode is in electric connection with the pumping element. The cap is engaged with the second end of the cylinder. The spring is attached to the cap. The spring is in electric connection with the pumping element. The cap includes an OFF position where the spring is off the second electrode and an ON position where the spring is in connection with the second electrode. A tubular joint is secured to the first end of the cylinder.

Abstract: A sealing system that provides a secure seal against liquid transfer in harsh environments, such as those found in wellbore applications. The sealing system utilizes a connector housing having an axial passage. The interior passage is sized to receive at least a portion of a single support block. The support block is secured to the housing by a retainer, such as a packing gland or a plurality of screws. The single block includes axial openings to individually support and isolate the conductors of a power cable when the power cable is connected to a submersible component.

Abstract: A hermetic compressor comprising a hermetic housing having a cylindrical sidewall portion, a portion of the sidewall disposed inwardly creating a recess, and a hermetic terminal assembly disposed in an opening in the recess to carry electric current into the housing. The terminal assembly includes a plurality of conductive pins each having an external portion preferably completely disposed in the recess so that the pins are completely shielded by the recess.

Abstract: A submersible motor unit is used to drive a pump and is submerged with the pump in liquid (water). The motor unit includes a tubular housing member and a tubular inner member which is enclosed by and disposed in a coaxial relationship with the tubular housing member. A stator is disposed in a stator chamber formed between the tubular inner member and the tubular housing member. A rotor is disposed in a rotor chamber disposed within the inner member. End walls close opposite ends of the tubular housing member and the tubular inner member. An annular capacitor is disposed in the stator chamber in an axially spaced apart relationship with the stator. The capacitor extends around the rotor chamber. A body of potting compound is disposed in the stator chamber and at least partially encloses the stator and the capacitor.

Abstract: A compressor is provided with an electrical connection within the length of the stator winding or another component, to reduce the total height of the compressor. The compressor includes a motor having a stator and a rotor, wherein the stator extends along an axis for a fixed axial length and the rotor rotates about the axis. The compressor also includes a set of terminal pins extending through the housing for providing electrical connection to the motor. The terminal pins are mounted onto the inside of the housing of the compressor and within the axial length of the stator. A connector having cooperating slots slides in a direction generally parallel, tangential or a combination thereof to the axis of rotation to connect the terminal pins to the motor.

Abstract: A submersible motor unit is used to drive a pump and is submerged with the pump in liquid (water). The motor unit includes a tubular housing member and a tubular inner member which is enclosed by and disposed in a coaxial relationship with the tubular housing member. A stator is disposed in a stator chamber formed between the tubular inner member and the tubular housing member. A rotor is disposed in a rotor chamber disposed within the inner member. End walls close opposite ends of the tubular housing member and the tubular inner member. An annular capacitor is disposed in the stator chamber in an axially spaced apart relationship with the stator. The capacitor extends around the rotor chamber. A body of potting compound is disposed in the stator chamber and at least partially encloses the stator and the capacitor.