Abstract: A submersible electric motor in a submersible pump system is provided that facilitates connecting auxiliary tools with the motor and disconnecting auxiliary tools from the motor without draining the fluid from the motor. The motor includes electrical terminals for connecting the auxiliary tool with the motor and may include a hydraulic connector that maintains the fluid in the motor when connecting or disconnecting the auxiliary tool and provides fluid communication of the fluid between the motor and a terminal area when the auxiliary tool is connected.

Abstract: A water pump has a housing with a pump housing part, provided with an intake opening and an exit opening, and a motor housing part. An impeller with a shaft is rotatably arranged in the pump housing part. An electric pump motor is arranged in the motor housing part, wherein the pump motor comprises a stator having several coils arranged on several stator poles and a rotor rotating in the stator. The pump motor is an electronically communicated motor. The stator is comprised of a pack of unitary laminations, respectively. The pump motor has control electronics arranged in the motor housing part. The stator with its coils and the control electronics are water-tightly encapsulated.

Abstract: A fuel pump includes a pump portion for pumping fuel. The fuel pump further includes a magnet having magnetic poles circumferentially alternate with each other. The fuel pump further includes an armature on a radially inside of the magnet. The armature includes a rotor core provided with a coil formed of a wire. The armature is rotatable for driving the pump portion. A commutator, which is in a substantially disc shape, is provided to an axial end of the armature for rectifying electricity supplying to the coil. The rotor core has an axial end having an outer circumferential periphery defining a commutator-side collar portion extending toward the commutator. The coil is formed by winding the wire between an outer circumferential periphery of the commutator and the commutator-side collar portion.

Abstract: A stator for an electrical machine includes teeth assembled from a plurality of stacked laminations mounted on a cylindrical protective surface thereby forming a plurality of slots. The stator also includes an armature winding assembled within the teeth by inserting components of the armature winding into the plurality of stator slots from positions external to the teeth in a manner that facilitates mitigating potential for coil distortion. The armature winding includes a plurality of coils that each include an end winding. The stator further includes a segmented yoke inserted around the armature winding in a manner that facilitates mitigating a potential for disturbing the end winding of the coils. Independently assembling the stator components in this manner facilitates varying a thickness and/or the number of heat conducting laminations between the yoke and teeth that subsequently facilitates heat transfer from the armature winding to an outer pressure casing of the machine.

Abstract: A stator lead retainer includes a stator lead retainer body having a plurality of through-holes extending longitudinally therethrough, each through-hole configured for receiving a stator lead. The stator lead body is constructed from an elastic material and is operable to accommodate stator leads of different cross-sectional shapes and diameters.

Abstract: A pump includes a pump unit having an impeller for sucking and/or discharging liquid; a motor unit for driving the pump unit; a case for accommodating the pump unit; a partition plate for isolating the motor unit from the pump unit; and a mold resin integrally formed with the motor unit to protect the motor unit. Further, a bottom portion of a cylindrical portion projecting from the partition plate to the motor unit has a liquid-free surface having a convex spherical shape. Moreover, a method of manufacturing a pump, the method includes the steps of installing a partition plate at a lower half; installing a stator and a controlling part at the partition plate; closing the lower half with an upper half; curing resin after filling the resin into a cavity formed between the lower and the upper half; opening a mold; and extracting a molded motor product.

Abstract: The method is provided for operating a pump unit with a centrifugal pump which is driven by an electric motor and which comprises a rotor running in a split tube. The rotor space is separated with respect to the stator in a fluid-tight manner. On running the motor to its operational rotational speed the fluid located in the rotor space due to the increasing rotational speed evaporates and is removed so that the motor finally functions as a dry-runner.

Abstract: A motor includes a stator core, insulators, coils and a rotor. The stator core includes a plurality of coil cores, which are circumferentially arranged, wherein each of the plurality of coil cores includes a tooth that radially extends, and an outer peripheral core that circumferentially extends at a radially outer side of the tooth. Each of the insulators covers a corresponding one of the plurality of coil cores, wherein a part of each of the insulator is provided radially outward of an imaginary straight line, which connects circumferential ends of an inner peripheral surface of the outer peripheral core. Each of the coils is formed at the insulator. The rotor is rotatably provided to an inner peripheral side of the stator core.

Abstract: A bearing of a water pump is adapted to be used with a washer and includes an approximately cylindrical body with an axial hole defined in its center. One end surface of the bearing, which faces the washer, has a nick for forming a water membrane so as to reduce friction and adhesion between the bearing and the washer.

Abstract: A canned motor has an L3/D4 ratio of less than 50, with one bearing on one end of the rotor assembly configured to resist longitudinal displacement of the rotor as by an axial shaft load, and another bearing on the other end of the rotor assembly configured to allow limited longitudinal displacement of the rotor assembly within the bearing as from thermal expansion, lengthwise adjustment or pressure from an axial shaft load. The rotor assembly may include a center shaft coaxially extended through a hollow shaft, with rotor windings mounted on the hollow shaft, with the first bearing positioned on one end of the hollow shaft and the second bearing mounted on the second hollow shaft end. A cap and nut assembly on the second hollow shaft end, into which the rotor shaft end is threaded, provides for adjusting the effective rotor shaft length protruding from the motor, and for replacement of the rotor shaft within the hollow shaft without removing the rotor assembly from motor.

Abstract: A system and method for protecting a motor for a submersible pumping system. A variety of motor protectors are provided for application in variable temperature environments and multiple wellbore orientations. The motor protectors may include one or more of a positively pressurized bellows, a relatively balanced pressure bellows free of sliding seals, and a multi-orientable labyrinth. Each of these motor protectors also may have various moisture absorbents, filters, particle shedders and various conventional motor protector components.

Abstract: A single-phase motor (10) particularly for submersed pumps, characterized in that it comprises an annular capacitor (14) interposed between the pump coupling head (15) and the stator winding pack (12).

Abstract: The brushless direct current motor comprises a housing 10, a stator 13 and a rotor 11 within the housing, windings on the stator, sensors for sensing the position of the rotor relative to the stator and electronic circuitry for switching the current in the windings in response to outputs from the sensors to cause the rotor to rotate relative to the stator. The sensors and at least a part of the electronic circuitry are encapsulated in an electrically insulating and fuel resistant material in a container within the housing.

Abstract: A ship propulsion arrangement is provided in which a mechanical drive shaft (3) extends through a hull (9) of a ship (1) to an external body (7). The external body incorporates an electric motor. The mechanical drive shaft (3) is driven when required by either a prime mover (2) located within the ship (1) or by the electric motor in the external body (7). This arrangement provides the benefits of hybrid operation without necessary accommodation of the electric motors within the limited hull space available in a ship (1).

Abstract: Apparatus, systems and methods are provided for transmission of optical signals through a wellbore whereby optic fibers are protected from exposure to harsh downhole fluids and conditions. The system comprises a power cable assembly running down hole from the surface and comprising both electrical leads and at least one fiber-optic lead, an electric submersible motor apparatus having optic fibers and optic fiber leads as an integral part of the motor and internal to the motor casing, and a connection(s) between the optic fibers internal to the motor casing and downhole sensors and other equipment requiring optical communication.

Abstract: A frameless switched reluctance motor (SRM) has a stator sandwiched between two housings. Axial load on the rotor shaft is directed through a first bearing, through the first housing to the stator and through the second housing to a motor support. Heat is dissipated using low-loss electrical steel, one or more air movers and air passages through the motor. Preferably a stator profile enables the air passages to be formed through the stator's lamination stack. Optionally air is routed through passages between the coils and through air passages along the air gap and radially through passages between an upper and a lower stator. A first self aligning bearing adapts to misalignment between the first housing and the shaft and a second bearing is provided with transverse movement. Preferably, the frameless motor is adapted for support to a wellhead for driving a downhole rotary pump and a rotary rod string.

Abstract: A technique for securing a conduit box to a housing of an electric motor is disclosed. The technique includes forming a hollow extension from a surface of the conduit box. The conduit box is placed on a motor frame so that the hollow extension is inserted into a hole in the motor frame that passes into the hollow interior of the motor frame. The hollow extension is plastically deformed inside the motor housing to a greater width than the diameter of the hole in the motor housing so that the conduit box cannot be removed from the motor housing. A stator is placed in the motor housing and wiring is routed from the stator to the interior of the wiring box through a passageway formed by the hollow extension.

Abstract: An end bell for a motor has a base plate, a bearing and a molded insert to couple the bearing to the base plate. The end bell with molded insert is durable, light weight and has good anti-corrosion properties. The bearing is held in relation to the base plate while the molded insert is disposed. A post-mold machining operation can be used to both size the bearing hole to the motor shaft but also to align the hole in relation to the base plate. Bushings and fasteners for assembly of the end bell to the motor housing and supplemental supports may be pre-attached to the base plate, molded into the molded insert or added in a post-mold operation. Deformations in the end bell may be used to couple the molded insert to the end bell.

Abstract: A method of manufacturing a watertight brushless fan motor includes first, combining a stator assembly with a stator and a circuit substrate, a case, a die, and an annular member. The stator assembly is mounted on the bearing supporting cylindrical section of the case. The bearing supporting cylindrical section is engaged and the die and annular member are fixed to the case. An insulating resin is poured into the die to mold spaces between the plate-like section and the bearing supporting cylindrical section so that the stator and the circuit substrate are included inside. The resin may be poured under low vacuum. With this arrangement, the watertight brushless fan motor is provided that can prevent occurrence of a crack in the outer surface of the molded part due to molding shrinkage of the insulating resin or expansion and shrinkage of the insulating resin caused by a change in ambient temperature.

Abstract: A lead-wire-fixing attachment for fixing a lead wire is provided in a lead-wire-fixed portion arranged in a stator core, and a lead wire is connected to a stator-winding mounting board by way of a through-hole provided at the upper end of the lead-wire-fixing attachment. The through-hole is formed by notches provided at a location where the first attachment and second attachment contact each other. An inlet passage through which a potting material is poured, outlet passages through which the potting material runs out, base portions which are inscribed in the inside wall of the lead-wire-fixed portion are formed in the upper portion of the lead-wire-fixing attachment. The lead wire is made to pass through the through-hole and the lead-wire-fixing attachment is inserted in the lead-wire-fixed portion, and then they are fixed by using a potting material.

Abstract: An end-wall unit for a submersible motor unit and a submersible motor unit for use in driving a pump including a housing that extends along a longitudinal axis and defines an interior chamber, a stator at least partially enclosed by said housing within a stator chamber, a rotor rotatably supported by a bearing assembly and at least partially enclosed by said stator, and an end-wall assembly that includes an end cap and at least one of a capacitor and a bearing assembly. The at least one of the capacitor and the bearing assembly is supported by the end cap in a position such that the at least one of the capacitor and the bearing assembly is at least partially enclosed by the housing when the end-wall assembly is installed on the motor unit.

Abstract: A cable connector assembly used for connecting exterior electrical cables to a motor housing has a hollow cap member with an opening through which the cable extends. A compressible retainer is compressed within the cap, around the cable and is held in place by a pressure member, which is held in place in the cap with a clip. The hollow interior of the cap may be filled with a sealant such as an epoxy in order to provide secondary sealing against moisture in addition to the compression of the retainer around the cable.

Abstract: Disclosed is an electric submersible pumping system for use in wellbore. The electric submersible pumping system includes a motor assembly, a pump assembly and a seal section disposed in the wellbore. The pump assembly is below the motor and is driven by the motor. The seal section is between the motor assembly and the pump assembly, and protects the motor assembly from thrust generated in the pump assembly. The seal section includes a shaft that transmits torque from the motor assembly to the pump assembly. A labyrinth chamber in the seal section restricts the flow of wellbore fluids. The seal section can also include a mechanical seal, a thrust bearing, a bag type chamber, an abrasion resistant bearing, and a motor electrical termination.

Abstract: A torque-generating apparatus includes a first assembly (10, 25) including a generally cylindrical member of magnetically soft material and having a longitudinal axis and a second assembly (2) arranged coaxially within the first assembly and including an electromagnetic winding (4). The first assembly (10, 25) and the second assembly (2) are rotatable relative to each other about the axis. Relative rotation between the first (10, 25) and second (2) assemblies induces a magnetic field which generates rotational torque between the first and second assemblies.

Abstract: A shock-proof electric marine engine, e.g. an engine or generator, is for a marine (Navy) ship, and includes a stator and a rotor in a housing. The stator and the rotor are connected in such a way that they are rotatably displaceable in a counter direction and in a radial/axial manner with limited slack. The rotor and stator form a displaceable unit in relation to the housing, which can be displaced away from the housing with a higher vibration overshoot range. The housing is elastically connected to the marine (navy) ship.

Abstract: A motor gear box has a direct current motor, a first bevel gear, a second bevel gear, a pinion transfer gear, at least one cluster gear, an output gear, an output shaft, and a collar abutting against the output gear and surrounding the output shaft. The motor gear box also includes a frame formed integrally with the collar, a first cover to protect the motor, and a second cover having a cradle formed integrally therein. The output shaft has at one end a stepped down shaft portion held in the cradle and at an opposite end a hollow internal chamber formed to receive a protuberance of a device requiring the delivery of high torque to carry out a task in a small space. A programmable control board is attached to one side of the motor; an electrode tip is arranged on a top of the motor; a lead harness assembly is secured around the electrode tip; and an L-shaped connection rod links the lead harness assembly to the control board to conserve space.

Abstract: In accordance with an embodiment of the present invention, a pump assembly for circulating a supercritical fluid is disclosed. The pump assembly comprises an impeller for pumping fluid between a pump inlet and a pump outlet; a rotating pump shaft coupled to the impeller, wherein the pump shaft is supported by corrosion resistant bearings; a rotor of a DC motor potted in epoxy and encased in a non-magnetic material sleeve; and a stator sealed from the fluid via a polymer sleeve. The pump can be of centrifugal type. The bearings can be made of silicon nitride balls combined with bearing races made of Cronidur® and can operate without oil or grease lubrication. The polymer sleeve can be a PEEK™ sleeve which forms a casing for the stator. The non-magnetic material sleeve encasing the rotor of the DC motor is preferably made of stainless steel. A portion of the fluid passing through the pump assembly can be diverted over the bearings and/or the rotor and stator.

Abstract: A system and method for protecting a motor for a submersible pumping system. A variety of motor protectors are provided for application in variable temperature environments and multiple wellbore orientations. The motor protectors may include one or more of a positively pressurized bellows, a relatively balanced pressure bellows free of sliding seals, and a multi-orientable labyrinth. Each of these motor protectors also may have various moisture absorbents, filters, particle shedders and various conventional motor protector components.

Abstract: In the embodiments described in the specification, an electric motor has a stator and a rotor and a wrap layer includes composite lamina arrangement containing a liquid barrier with a veil cloth and a chopped strand mat resin layer, a strength element containing a hoop wrap including a polymeric resin layer with continuous fibers extending circumferentially around the rotor and another polymeric resin layer with fibers extending helically, a liquid barrier having a veil cloth and a chopped strand mat resin layer and another strength element including a polymeric resin layer with continuous fibers extending circumferentially around the rotor. The outer surface of the composite lamina arrangement may be corrugated to promote or inhibit flow of liquid through the space between the stator and the rotor.

Abstract: An electric motor is provided with rotor and stator. The stator includes stator poles radially facing the rotor and surrounded by stator windings. An insulating sleeve is positioned between the rotor and stator. The sleeve includes projections arranged radially with respect to the rotor. The projections project in a direction away from the sleeve and rotor and towards the stator. The projections project between adjacent stator poles and may further serve to anchor the poles. The projections may have a T or elongated T shape. The projections and sleeve are rigid and either or both may be made of plastic. The sleeve provides a moisture or liquid tight insulation for the stator so that the motor can be used in moist or liquid environments.

Abstract: The method serves for manufacturing a canned rotor of a permanent magnet motor. Firstly a shaft (2) provided with a rotor core [rotor laminated sheet package] (3) together with a pre-blank (11) forming the later magnet and a [sheet] metal casing (6) surrounding the pre-blank is applied with play into a pressing tool (12). The pre-blank (11) is then deformed by way of end-face pressure impingement such that it then bears with a non-positive fit and over the whole surface on the rotor core [rotor laminated sheet package] (3) and on the [sheet] metal casing (6), wherein the casing (6) is widened radially until its bearing on the pressing tool (12) by way of the radially widening pre-blank (11). After this the magnetisation and hardening is effected, whereupon the free spaces remaining between the [sheet] metal casing (6) and lid (2) are closed by two annular lids, which are tightly connected to the [sheet] metal casing (6) and the shaft (2) with a material fit.

Abstract: A submersible pump motor has rotor sections spaced apart from each other with bearings located between. The bearings support the shaft of the rotor within a stator. The bearing is stationary and has a cavity in its outer periphery. A metallic coiled member is positioned along the circumference of the bearing, and rests in the cavity on the outside diameter of the bearing. The coiled member engages the bearing and the inner wall of the stator to prevent rotation of the bearing.

Abstract: A concatenated motor assembly for providing rotational power that includes a continuous rotatable shaft cooperating with a first motor module assembly. The first motor module assembly communicates with a motor coupling unit, which in turn communicates with a second motor module. The second motor module and the motor coupling unit each cooperate with the rotatable shaft. The first and second motor modules are wound rotor electric motor. The first motor module assembly generates and provides an induced current to the motor coupling unit, which in turn provides power input to the second motor module assembly.

Abstract: A terminal block assembly for electrical generators, such as high speed AC generators used in aircraft, is made from components that are readily assembled and disassembled for ease of installation, maintenance, and repair. The terminal block assembly is formed of a terminal block and one or more terminal assemblies. The terminal block has a main body with at least an upper surface and a lower surface. A first cavity is formed in the main body lower surface, and an opening that extends through the main body between the upper surface and the first cavity. A threaded fastener is inserted into the opening and into the first cavity, and a bolt is coupled to the fastener to secure the fastener in the opening. Each terminal assembly is coupled to the terminal block and includes one or more electrically conductive terminal plates, feed-throughs, and slugs for connection to stator output leads, that are electrically and mechanically coupled together using electrically conductive fasteners.

Abstract: An integrated motor and clutch assembly is provided, which includes a housing that rotatably supports an input shaft and an output shaft. A selectively engageable friction clutch is disposed between the input shaft and the output shaft for transferring torque therebetween. The friction clutch includes an outer hub connected for rotation with the output shaft. The integrated motor and clutch assembly also includes a motor having a rotor non-rotatably connected to the outer hub of the friction clutch and disposed coaxial with the input and output shafts. The motor also includes a stator secured to the housing and disposed concentric with the rotor.

Abstract: A multiple-function pumping device includes a pump for supplying at least one jet, an electric motor with a stator and a rotor for driving the pump, and circuitry for electrically connecting the motor to a main voltage power supply line. The stator is provided with an excitation winding. The stator has electrical circuit components for powering an external lighting device with low voltage. Preferably, the low-voltage powering circuit components include an electric transformer having as a primary circuit the excitation winding of the motor and further include a secondary circuit which is also wound around the stator.

Abstract: A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.

Abstract: A fluid impermeable barrier is provided to protect the rotor of an electric motor. The barrier includes a body portion with a relatively large opening at one end to receive the rotor laminations and a smaller opening at the other end to receive one end of the rotor shaft. With the body portion positioned about the laminations, a cap with an outer perimeter and central opening is slid down the other end of the rotor shaft to close the large opening in the body portion. The assembly is completed by sealingly attaching the outer perimeter of the cap to the large opening in the body portion and sealingly attaching the smaller openings in the cap and body portion to respective portions of the rotor shaft. Thus, the fluid impermeable rotor barrier includes no more than two parts that are assembled onto the rotor using no more than three areas of attachment.

Abstract: In the embodiments described in the specification, a rim-driven propulsion pod arrangement has a cylindrical housing with a duct providing a flow path for water and a rotor assembly supported from a central shaft and containing a rotating blade row and driven by a rim drive permanent magnet motor recessed in the housing. An array of vanes downstream from the rotating blade row is arranged to straighten the flow of water emerging from the rotating blade row. Radial bearing members on the rotor have a hardness less than that of the shaft on which the rotor is supported and relatively soft protrusions are provided in the space between the rotor and the housing to limit excursion of the rotor. A thrust bearing has wedges arranged to form a water wedge between facing surfaces of the rotor and the rotor support during rotation of the rotor.

Abstract: A molded part is formed of an insulating resin such that a stator, electronic components, and a circuit substrate are included inside the molded part. A protective layer for preventing breakage of electrical connection that might occur due to expansion or shrinkage of the molded part is provided at least between the electronic components and the molded part. The protective layer is formed of an insulating material having shear adhesion strength smaller than that of an insulating resin of the molded part that has been cured. The shear adhesion strength and the thickness of the protective layer are defined so that, when the expansion or shrinkage which might cause the breakage of the electrical connection has taken place in the insulating resin of the molded part, separation between the electronic components and the protective layer can be caused.

Abstract: An integrated motor propulsor includes a rotor which a plurality of rotor blades adapted to rotate about a center axis. An outer ring surrounding the rotor contacts one of the rotor blades and has a field means positioned on the outer ring. A duct is in low friction contact circumferentially outside the outer ring. A stator is positioned in the duct to interact with the field means. The duct also has a plurality of pitch control apparatuses pivotally joined to outboard blades which extend radially outward from the duct.

Abstract: In a watertight brushless fan motor of the present invention, a first pad 33 is disposed in a first space between a stator 1 and a circuit substrate 3, A second pad 35 is disposed in a second space between the circuit substrate 3 and a plate-like section 7c of a case 7. Spaces between the plate-like section 7c of the case 7 and a bearing supporting cylindrical section 7a are formed with an insulating resin in such a manner that the stator 1 and the circuit substrate 3 are included inside, thereby forming a molded part 31, With this arrangement, the watertight brushless fan motor is provided that can prevent occurrence of a crack in the outer surface of the molded part due to the so-called molding shrinkage of the insulating resin or expansion and shrinkage of the insulating resin caused by a change in ambient temperature.

Abstract: A torque-generating apparatus comprises a first assembly (10, 25) including a generally cylindrical member of magnetically soft material and having a longitudinal axis and a second assembly (2) arranged coaxially within the first assembly and including an electromagnetic winding (4). The first assembly (10, 25) and the second assembly (2) are rotatable relative to each other about the axis. Relative rotation between the first (10, 25) and second (2) assemblies induces a magnetic field which generates rotational torque between the first and second assemblies.

Abstract: The invention concerns an AC electric motor (1) comprising a stator magnetic circuit including a first part (2) whereon are mounted electrical windings (7 and 8) and a second recessed part (10) wherein is mounted a rotor (14). The invention is characterized in that the first part (2) of the stator magnetic circuit and the electrical windings (7 and 8) are mounted inside a stator chamber (20) with sealed wall, the second part (10) of the stator magnetic circuit, the cylindrical rotor (14) being located outside said chamber. The invention is applicable in the oil industry for pumping fluids in bottom holes producing hydrocarbons in liquid, gas or polyphase form and in chemical and nuclear industries for pumping dangerous or chemically harmful fluids.

Abstract: An electronically controlled electric motor has, as position sensors (6), coils (5) which are arranged in a stator (2) and opposite permanent magnets (4) of a rotor (3). The coils (5) are produced integrally with connecting leads (7). This allows the electric motor to be used in an environment with solvents. Furthermore, the electric motor is of a particularly inexpensive design.

Abstract: A canned motor comprising a rotor assembly having at least 6 poles, a stator assembly, and an isolating can separating the rotor assembly and stator assembly. The canned motor an L3/D4 ratio of less than 50, and first and second frictionless bearings positioned on the rotor shaft.

Abstract: An Archimedes' screw serves as a rotor, inducer, impeller, and/or driver with motor and/or generator configurations that surround the screw by attaching to an outer cylinder of the screw. The screw acts as the motor's rotor axis with attached permanent magnets and or frame and the stator is built around the auxiliary circumference of this rotor. The rotor may also house half the bearings and can be used for the movement of fluids and/or solids, for cavitation-less drive of water vehicles, or for the generation of electrical power when the fluids become the motive force to drive the unit.

Abstract: The invention relates to an immersed electric motor with a rotor, a stator with pole shoes, and a plastic casing positioned between the rotor and stator. According to the invention, filler pieces are positioned between the pole shoes in such a way that the filler pieces are in contact with one another forming a closed bore that serves as a support for the plastic casing.

Abstract: A bilge pump includes an outer housing having an interior wall separating a first cavity and a second cavity, an on/off electrical switch located within the first cavity, and a single-piece float located within the second cavity and having a float body and an actuator arm extending outwardly therefrom, wherein the float operably connects the electrical switch through an aperture in the interior wall, and wherein the float is configured such that the aperture remains above a water line within the second cavity during operation of the pump.

Abstract: A method and device are provided for stabilizing shaft bearings in a motor having a hollow shaft and holes communicating the shaft and the bearings. A lubricant pump is provided for pressurizing a volume of lubricant located within the motor housing, the pump having a set of impellers attached to a lower end of the shaft and rotating with the shaft, the impellers being located in the flow path of the lubricant. A diffuser is located upstream of and adjacent each impeller. The impellers increase the radial velocity of the lubricant, and this velocity is converted into a pressure head at the impeller outlet. The lubricant flows through the first diffuser, through the first impeller, through the second diffuser, and then flows through the second impeller and out into a reservoir. The pressure causes the lubricant to flow through the hollow shaft and through passages to stabilize the bearings.