Abstract: The object of the present invention is to provide not only a highly reliable resin-molded stator not suffering insulation breakdown between the different phases of the stator coils even when the operation mode where the output of a rotary machine using a resin-molded stator in which a stator coil wound around a plurality of slots and a stator coil provided at the stator core end are resin-molded is to be increased from the level under a stopped status to the maximum achievable level within a short time is repeated, but also a method of manufacturing such a stator, and a rotary machine using the same.

Abstract: An electric motor includes a housing having a bushing mounted at a first end about a shaft extending through the housing. A lubricant recirculation member formed of a one-piece assembly of unitarily joined oil throw and vibration dampening material portions is fixedly mounted on the shaft between a commutator and the bushing. The lubricant recirculation member recirculates lubricant from the bushing back toward the bushing and away from the commutator and provides a vibration dampening layer between the bushing and the commutator.

Abstract: The micromotor serves to drive an impeller (12) rotating in a pump housing (14). The excitation winding of the micromotor is surrounded by an enveloping flux return structure (18) of ferromagnetic material divided into rings (35). The rings (35) are separated from each other by slots (25). The slots are produced by laser cutting of a continuous tube. The enveloping flux return structure has a small wall thickness of a few tenths of a millimeter. The rings (35) are mutually connected by bridges (26). The enveloping flux return structure (18) can be integrally formed with the pump housing (14) of the pump (11). The micromotor can be produced in a small format with a small diameter. It has a high flow rate at a correspondingly high rotational speed. The micromotor is particularly suitable for introducing blood pumps into the vascular system in a non-operative minimally invasive percutaneous manner.

Abstract: A modular electric motor for use in a wellbore. The modular motor includes a plurality of modular motor sections. The modular motor sections being mechanically and electrically coupleable. At least one modular motor section having a rotor. The rotor of one modular motor section having a rotor being drivingly coupleable to the rotor of a second modular motor section having a rotor. Thus, a given motor may be assembled to a variety of desired lengths by connecting the appropriate number of modular motor sections.

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: An azimuth propeller device includes an azimuth pod, a POD propeller member provided with the azimuth pod, and a motor which drives the POD propeller member. The motor is provided inside the azimuth pod, and at least one radiation member for releasing the heat generated by the motor is provided at an outer periphery of the azimuth pod.

Abstract: A weight release mechanism for an underwater object. Through a detachable latching mechanism between the underwater object and a heavy block and a set of control circuits, the underwater object may be released from the heavy block without any damages to the latching mechanism and may be reused many times. The releasing process is triggered by an electrically driven rotation.

Abstract: A fluid pump, in particular for the cooling or heating circuit of a motor vehicle, has a claw pole stator and a rotor that is separated from the claw pole stator by a tube, is immersed in a fluid, and has a vane wheel. Claws (25) of the claw pole stator (21) are an integral component of the tube (11), which is part of a motor housing (2), and the number of mounting steps is thus reduced.

Abstract: An integrated brushless DC wet motor pump unit comprises a pump, a motor and a motor controller all contained within a housing. The motor includes a stator having stator coils fixed in relation to the housing and a motor rotor surrounding the stator coils and supported for rotation in the housing. A drive coupling drivingly couples the motor rotor to a rotating pump element, and the drive coupling, rotating pump element and motor stator are radially supported on a central support member. The various motor and pump components are assembled into the housing from one axial end of the housing, with the motor rotor, drive coupling and rotating pump element having axially telescoping anti-rotation elements connecting the same for common rotation. The motor rotor includes a radially outer back-iron and a rotor magnet that is insert molded into the rotor back-iron that is rotatably supported at its outer diameter by a journal surface on an inner diameter surface of the housing.

Abstract: Low voltage electrical power is supplied to a diagnostic control device in a sealed compressor. Electrical power is tapped from a high voltage power line and transformed to low voltage power that in turn operates the diagnostic control device. The diagnostic control device and the electric voltage transforming system are housed within the sealed compressor shell, thus eliminating the need for additional openings in the compressor shell. Other low voltage devices can be powered in this way.

Abstract: A process and apparatus for treating a wellbore, comprising subjecting a substantially same portion of the wellbore to vibratory waves produced by a plurality of vibratory wave generators. The vibratory waves may have about the same frequency or a plurality of frequencies, and the frequencies may partially overlap, not overlap, or be modulated across a range. Additionally, the frequencies may be modulated in an oval, hoop, and flexural modes. The vibratory waves may be produced by firing the vibratory wave generators simultaneously or in sequence. Combinations of a vibrating pipe, piston pulser, or valve may be used as vibratory wave generators. In a preferred embodiment, the thickness and change of thickness of a mudcake on the interior surface of a wellbore are measured to evaluate the effectiveness of the wellbore treatment.

Abstract: The invention pertains to equipment and methods in which the rotatable drive member of a variable speed motor, such as a switched reluctance motor, carries a rotatable pulp processing element (10). Magnetic bearings (22, 24) levitatingly support both the rotatable drive member (15) and associated rotatable pulp processing element (41) and control axial and radial positionning thereof relative to the axis of rotation of the drive member.

Abstract: An electrically powered coolant pump particularly suited for an internal combustion engine has a pump housing having an elongate shape which encloses a pump wheel on the inlet side and subsequently downstream therefrom encloses an electric motor. An annular flow passage for the coolant is formed between the pump housing and the outside of the electric motor. The electric motor is encapsulated against the coolant, and the structural component of electric motor and pump wheel is retained in the axial range of the electric motor with at least one web in the pump housing through which connections for driving the electric motor are routed. The electric motor is cooled by the coolant flowing by, and may therefore be operated at very high rotational speeds, so that a small structural size and a low weight may be realized. Widely varying installation locations for the coolant pump are therefore possible.

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, an electric motor has a stator with an inner cylindrical composite can member affixed to the stator housing by screws and the rotor has an outer cylindrical can member affixed to the rotor by screws, each of the composite can members being sealed to the component to which it is affixed by O-rings. In one embodiment ridges are formed in the surface of one of the composite can members facing the space between the stator and the rotor to control the flow of liquid through the space.

Abstract: A weight release mechanism for an underwater object. Through a detachable latching mechanism between the underwater object and a heavy block and a set of control circuits, the underwater object may be released from the heavy block without any damages to the latching mechanism and may be reused many times. The releasing process is triggered by an electrically driven rotation.

Abstract: An anticondensation device particularly for electric motors, comprising a box-like body that contains the stator windings inside which the enclosure for a rotor is arranged hermetically, a cover to be fixed over the bottom of the box-like body, spaced therefrom, to define an interspace and a perimetric air passage gap. The bottom has through holes, and corresponding first collars protrude perimetrically to the holes toward the cover and enter with play second collars that protrude from the cover toward the bottom. An air passage pathway is formed between the first and second collars. The box-like body is arranged in functional configuration with its bottom substantially vertical.

Abstract: Arrangements are described wherein fluid is supplied under pressure to lubricate and replenish the fluid film located between the rotating, inner bearing sleeve and the outer, stationary sleeve insert of the bearing assemblies of a motor. The sleeve insert is provided with fluid metering passages that permit lubricating fluid to pass through the body of the sleeve insert. The sleeve insert is disposed radially within a sleeve insert holder, and a fluid gap is defined between the two components. During operation, vibration of the rotor shaft within the stator bore is damped by the fluid spring created by the metering of fluid through the sleeve insert. As a result, friction is reduced and the lifespan of the motor increased.

Abstract: A pump unit for medical and food use, including: a stator provided with a number n of poles and powered by a power and control circuit fed by alternating electric current; a rotor having an equal number n of poles, which is fixed directly onto a shaft of a pump; and a jacket of amagnetic material which isolates the rotor from the outside and is positioned within the air gap between the rotor and the stator.

Abstract: The motor construction unit is provided for a submersible pump unit and comprises an electric motor with a frequency converter connected in series which are arranged in a common housing casing round in cross section. The frequency converter is as an insert arranged axially flush to the motor and consists essentially of three components, specifically of a common semiconductor element containing the power part, of a component containing the input and intermediate circuit and a component containing the 3 control and regulation electronics. The component containing the power electronics is via a heat distributor connected to the housing casing. The neat distributor is in its outer contour adapted to the inner contour of the housing casing and is pressed into this for heat conduction over the whole periphery.

Abstract: In a small-sized hydroelectric power generating apparatus in which a waterwheel 3 arranged in a fluid path and rotating with passage of a prescribed flow rate of fluid, a rotating body 4 coupled with the waterwheel and rotating therewith is used as a rotor portion arranged oppositely to a stator portion 6, and the rotor portion is rotated relatively to the stator portion 6 with passage of the fluid to generate electric power, the small-sized hydroelectric generation includes a continuous internal space formed when a first case 1 and a second case 5 are fit to each other, said first case having an inlet 12 and an outlet 13 of said fluid path and said second case having the internal space which communicates with said inlet and outlet and in which said rotating body is arranged and separating the internal space from the stator portion, wherein a concave portion 14 is provided at a fitting portion between said first case and said second case; an opposite wall 5a opposite to the inner wall of said concave portion

Abstract: An electric propulsion pod for a ship having a electric propulsion pod heat rejection member. The electric propulsion pod is attached below the ship by a hollow ship access shaft. The electric propulsion pod contains an electric motor for producing a water propulsion. The electric motor generates an amount of heat that is conducted and subsequently released into the water through the electric propulsion pod and ship access shaft surfaces. The heat rejection member is fitted for increasing the conduction and subsequent release of the electric motor heat.

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: A submerged motor which includes a lower housing formed with a plurality of openings, an upper housing engaged with a top of the lower housing, a motor including a rotor and a solenoid enclosing the rotor, the chamber being in communication with the water outlet and having a hole communicated with the lower housing, the circuit board being provided with a pair of sensors and connected with an electrical plug via a first electrical cord, an impeller being fixedly mounted on the rotor, and a cover configured to engage with the upper housing so as to close the recess thereby protecting the circuit board from damage, whereby only when the water level is above all of the two sensors will the submerged motor be turned on thereby preventing any accidents caused by overheating of the motor.

Abstract: A submerged motor which includes a lower housing formed with a plurality of openings for passage of water, an upper housing engaged with a top of the lower housing and formed with a water outlet at a top thereof, a motor including a rotor and a solenoid enclosing the rotor and being fitted within a chamber of the upper housing, the chamber being in communication with the water outlet and has a hole communicated with the lower housing, the motor being electrically connected with a circuit board which is fitted in a recess of the upper housing, the circuit board being provided with a pair of sensors and connected with an electrical plug via a first electrical cord, an impeller being fixedly mounted on the rotor so that when the motor is turned on, the impeller will be rotated in unison with the rotor thereby forcing water of the outlet, and a cover configured to engage with the upper housing so as to close the recess thereby protecting the circuit board from damage, whereby only when the water level is above al

Abstract: An electric fuel pump (10), including a housing (12), an inlet (14), an outlet (16), a means for transmitting fluid from the inlet to the outlet (18), an electrical motor (20) , two brushes to transmit electrical current to the motor (22), two electric terminals (23) to transmit current to the two brushes (22) from a wire harness (24) connecting the terminals (23) with outside controls, and a protective covering of thermoplastic (26) bonded to said terminals. The protective covering of thermoplastic prevents corrosion of the terminals (23).

Abstract: An electric submergible pumping system having a submergible electric motor with a unique rotor bearing system to promote longevity of the motor. The system includes an electric motor having a housing and a stator mounted within the housing. A shaft is rotatably mounted within the housing for rotation within an interior, axial passage through the stator. A rotor bearing assembly is disposed intermediate the stator and the shaft. The assembly includes a bearing sleeve mounted adjacent the shaft, and a main body portion disposed in sliding engagement with the bearing sleeve. A spring mechanism, such as a wave spring, is engaged with the main body portion. A bracelet is located between the spring mechanism and an interior surface of the stator. The spring mechanism biases the bracelet against the stator to prevent the body portion from rotating during rotation of the shaft.

Abstract: A modular electric motor for use in a wellbore. The modular motor includes a plurality of modular motor sections. The modular motor sections being mechanically and electrically coupleable. At least one modular motor section having a rotor. The rotor of one modular motor section having a rotor being drivingly coupleable to the rotor of a second modular motor section having a rotor. Thus, a given motor may be assembled to a variety of desired lengths by connecting the appropriate number of modular motor sections.

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 permanent magnet synchronous motor system. The system uses a permanent magnet AC synchronous motor having an elongated housing, of the type used in progressive cavity pumping applications. Within the stator, a multi-section rotor is rotatably mounted. The rotor includes a plurality of rotor sections that are angularly offset from each other. The rotor sections are mounted on a drive shaft, and the sum of the offsets is generally comparable to the angular displacement undergone by the drive shaft under a normal operating load.

Abstract: A submersible electric motor driven pump includes a motor chamber and a pump chamber separated by a seal chamber. Inboard and outboard shaft seals immersed in an oil buffer fluid within the seal chamber restrict the flow of liquid from the seal chamber into the pump and motor chambers. An integral or externally mounted pre-pressurized buffer fluid reservoir maintains a positive fluid pressure in the seal chamber relative to the external pressure at working depth, and suitable buffer fluid level within the chamber, preventing the ingress of the pumped media through the outboard seal. A unique impeller design circulates fluid within the seal chamber in the region of the outboard shaft seal, allowing continuous run dry operation when used in conjunction with an integrally cooled motor design. A cartridge shaft sleeve subassembly permits with a bearing configured between the inboard and outboard seals, facilitates maintenance.

Abstract: A washer pump motor includes a case having a pair of arcuate walls and a pair of flat walls. A pair of brushes are opposed to a commutator. A lid, which forms part of the case, includes a pair of brush supports for respectively supporting the brushes. Each brush support includes a base plate, which is fixed to the lid, and a plate spring, which detachably engages with the base plate. The plate spring has a retained portion retained by the corresponding base plate and a resilient arm portion to which the corresponding brush is fixed. The resilient arm portion extends from the retained portion and is substantially parallel to the flat walls. This maximizes the length of the resilient arm portion and maintains the performance of the motor. Also, this arrangement permits miniaturization of the motor and facilitates assembly.

Abstract: The invention relates to electric arc processes particularly for underwater use. Electric arc processes effected under water ordinarily operate at a voltage of 20 or 30 volts, with an open circuit of e.g. 50 volts, and are at a level that does not pose a serious risk to the diver. Such as plasma arc cutting has typical voltages of 100-200 volts, and an open circuit voltage of 200-400 volts, and can put a diver at considerable risk of electric shocks at a level that can be life threatening. The object of the invention is to avoid such risks, an objective met by electric arc equipment comprising an earthed safety electrode strategically positioned close to the torch of the electric arc equipment, to create the closest earth to which current could flow, but without the striking of an arc between a torch electrode and the earthed safety electrode.

Abstract: It is the object of the present invention to provide a long-life brushless fan motor which can be used for a long time in the environmental conditions in which water containing oil mist is splashed on the fan motor. A stator 1, a circuit substrate 4 including an electronic parts and a plurality of lead wires 21 are received in a stator side case 14. These parts in the case 14 are molded with an epoxy resin having a Shore hardness of D30 to D90 after curing, thereby forming a molded part 24. The pole faces 2b of the stator magnetic poles of the stator are covered with the molded part 24.

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 washer pump motor includes a case having a pair of arcuate walls and a pair of flat walls. A pair of brushes are opposed to a commutator. A lid, which forms part of the case, includes a pair of brush supports for respectively supporting the brushes. Each brush support includes a base plate, which is fixed to the lid, and a plate spring, which detachably engages with the base plate. The plate spring has a retained portion retained by the corresponding base plate and a resilient arm portion to which the corresponding brush is fixed. The resilient arm portion extends from the retained portion and is substantially parallel to the flat walls. This maximizes the length of the resilient arm portion and maintains the performance of the motor. Also, this arrangement permits miniaturization of the motor and facilitates assembly.

Abstract: An electric motor with a permanent-magnet rotor having a viscous coupling to the shaft. In its electric part, the motor can be likened to a permanent-magnet synchronous motor, in which the rotor is mounted freely on the shaft and is contained in a hermetic casing which is rigidly coupled to the shaft and contains a liquid which fills the gap between the rotor and the container. The rotor therefore drives the casing only by virtue of the presence of the interposed liquid, so that the load is not rigidly connected to the shaft and the resulting operation of the motor can be likened to that of an asynchronous motor allowing mutually different rotation rates of the shaft and of the rotating field.

Abstract: A ceramic bearing system for a centrifugal pump includes two substantially identical circular ceramic shafts, two substantially identical non-circular ceramic washers and two substantially identical non-circular ceramic bearing members. The centrifugal pump incorporating the bearing system includes an impeller shaft having one of the circular ceramic shafts mounted in each end and a non-circular recess in a rear end thereof for receiving one of the non-circular ceramic washers. The impeller is provided with a non-circular recess in a front end thereof for receiving the other non-circular ceramic washer. One of the non-circular ceramic bearing members is mounted in a non-circular hole or recess in the pump volute and the other non-circular ceramic bearing member is mounted in a non-circular hole or recess in the rear of the motor.

Abstract: A downhole pumping system includes a downhole pump that is coupled to a downhole motor. The downhole motor includes a motor protector that utilizes one or more retractable and extensible pistons, instead of an elastomeric bag, to accommodate motor oil contraction and expansion. The motor protector may also include one or more contamination containment sections for processing contaminants in downhole fluid to reduce contamination of the motor oil.

Abstract: An electric motor having a rotatable shaft centrally located within a cylindrical stator bore in a housing. A first retaining ring engages the shaft, and a rotor stack is supported axially slidably on the shaft. A second retaining ring engages the shaft above the rotor stack and is positioned a distance above the rotor stack to allow for free thermal expansion of the rotor stack. A spring locates between one of the retaining rings and the shaft to bias the rotor stack against the other retainer ring.

Abstract: A seal-less pump and electric motor assembly includes a motor rotor fixed to a driving shaft connected to an impeller in the pump assembly. The rotor and impeller are enclosed in a common housing such that the rotor rotates within any fluid being pumped by the impeller. The portion of the housing circumscribing the rotor includes a plurality of axially extending, circumferentially spaced strips of magnetic material penetrating through plastic material of the housing. Each of the strips coincide with corresponding ones of the pole teeth of a motor stator circumscribing the outer portion of the housing such that the strips in the housing act as extensions of the pole teeth. In one embodiment, the strips of magnetic material in the housing are formed by molding powdered iron in a plastic binder material. The strips are then placed in a mold in which the housing is formed by injecting plastic. The plastic binder in the strips melds with the injected plastic to form a continuous housing for enclosing the rotor.

Abstract: A motor protector for use in protecting an electric motor in a subterranean environment. The motor protector utilizes a dual, flexible bladder system. One of the expandable bladders provides for the expansion and contraction of motor oil. The other expandable bladder contains a supply of neutralizing solution. The bladder filled with neutralizing solution cooperates with the bladder filled with motor oil to maintain the expandable bladder bathed in neutralizing solution. This prevents migration of corrosive agents into the motor oil.

Abstract: A downhole pumping system includes a downhole pump that is coupled to a downhole motor. The downhole motor includes a motor protector that utilizes one or more retractable and extensible bellows, instead of an elastomeric bag, to accommodate motor oil contraction and expansion.

Abstract: A motor has a rotor rotatable about an axis, a can surrounding the rotor and having an outer surface, and a plurality of outwardly projecting stator supports fixed on the outer surface, and respective stator windings mounted directly on the stator supports. The stator supports project radially of the axis and there are at least three and at most twelve such stator supports and they are angularly equispaced about the axis.

Abstract: To prevent powder caused by wear of brushes from entering a contact chamber, a first stationary contact is electrically connected to a battery and a second stationary contact is connected to positive brushes, wherein a contact bracket is provided to hold the first stationary contact, and a contact chamber cover is provided to interpose and hold the second stationary contact between the contact chamber cover and the contact bracket so that the contact chamber can be kept in an airtight state.

Abstract: A long electrical motor mainly for submersible use having a high efficiency, being mechanically stable, capable of being assembled under low time consumption at low costs, and which is easy to maintain and repair. The long motor has a rotor divided into sections with at least one low friction bearing arranged between the sections and in each end of the long motor. A stator is stacked continuously past internal bearings using thin sheets of metal discs between the bearings. Each disc in the bearing pedestal is significantly thicker than the common stator discs and is made of paramagnetic metal with good heat transfer properties. The inner diameter of each disc in the bearing pedestal is smaller than the inner diameter of the common stator discs so that a bearing inserted into the bearing pedestal is held by a tight fit. The inner diameter of the bearing fits tightly to the axis of the rotor and slots for the stator windings in all metal discs are radially open towards the rotor.

Abstract: A motor protector for use in protecting an electric motor in a subterranean environment. The motor protector utilizes a dual chamber system for absorbing the expansion and contraction of the internal fluids of a submergible electric motor. One of the chambers provides for the expansion and contraction of the internal fluids of a submergible electric motor. The other chamber is in fluid communication with the subterranean environment. A gas pocket is disposed within the motor protector between and in fluid communication with both of the dual chambers. The volume of gas couples the fluid pressure of the subterranean environment to the internal fluids of the electric motor without direct contact between the internal fluids of the electric motor and fluids from the subterranean environment.

Abstract: A centrifugal pump has a housing with intake and discharge fittings at axially opposite ends. The electronic motor is supported on ribs within the pump housing and the motor casing is closed by the electronic control circuit for the motor which seals the motor against the pump liquid. The coolant thus flows around the electric motor and its control circuit.

Abstract: The present invention provides an insulating material for the enameled wire of a motor of a refrigeration compressor using hydrofluorocarbons as the refrigerant and, as the refrigerating machine oil, a synthetic lubricating oil having at least one ester bond in a molecule such as ester-modified polyoxyalkylene glycol type, ester-modified ether type or ester type, which insulating material contains a compound having at least one carbodiimide group.This insulating material for the enameled wire of a motor of a refrigeration compressor, which is free from the above-mentioned problems of the prior art, which can prevent the surface deterioration or peeling (blister or cracking) etc. seen in the conventional insulating material used for covering the enameled wire (e.g.

Abstract: An apparatus for pumping fluids in a wellbore from a subterranean formation. The apparatus includes a tubular housing which is capable of being suspended from its associated upper end in a well bore or hole that communicates with a subterranean formation or oil reservoir. The tubular housing has at least one port or opening where through fluids (e.g. water, oil etc.) pass from the well bore. A pump assembly is contained within the tubular housing such as to be supported thereby. A rotating rod assembly is also contained within the tubular housing and is coupled to the pump assembly for operating the same. A gear assembly is coupled to the rotating rod assembly, and a motor assembly is coupled to the gear assembly while being dependedly attached to the tubular housing. The apparatus additionally includes a filter assembly coupled to the motor assembly.