Abstract: A heat-dissipating fan of the invention has an axle, a bearing, a rotor and a stator. The axle and the bearing are made of a ceramic material, and are located at a central location of the rotor and the stator. The bearing is a hollow cylinder integrally formed into a single body, and has a central hole and a recess at its bottom. The axle penetrates through the central hole of the bearing to contact the recess. A magnetic force center of the silicon steel sheet is at a level lower than that of the magnetic bar to generate radial and axial force components, allowing stable rotation of the rotor. The heat-dissipating fan of the invention provides advantages such as low friction, lower noise, low energy consumption, high performance and high stability.

Abstract: An axial flow fan motor having an impeller molded integrally with a shaft from a synthetic resin. The shaft is easily assembled with a bearing arrangement by being brought into tight contact with the inner ring of the bearing arrangement and is reliably fixed thereto in the elastic region of the shaft. A through hole is formed in the shaft along its central axis. After the shaft is fit into the inner ring of the bearing arrangement, a metal pin is pressed into the axial through hole. Because the pin is pressed in, the shaft is elastically expanded and brought into tight contact with the inner ring and fixed thereto in the elastic region of the shaft. Furthermore, the distal end portion of the shaft elastically outwardly expands and is pressed against the end surface of the inner ring, thereby preventing the bearing arrangement from coming off the shaft.

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

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

Abstract: An oil-retaining structure for fan comprises an oily bearing with a central axis hole for pivoting a fan shaft. An oil-collecting recess trench is formed on an inside wall of the central axis hole. There is an acute angle oil-guiding ring edge correspondingly formed at one side of the oil-collecting recess trench. When the fan rotates, lubricant inside the oily bearing is upwardly sucked and blocked by the acute angle oil-guiding ring edge, and returns to the oil-collecting recess trench so as to construct an internal-recycle oil-retaining system.

Abstract: A novel fluid pump includes a stator body defining a pumping chamber and an impeller operationally disposed within the chamber. The impeller has opposed ends with a central axis defining an axis of rotation. Passive magnetic bearing sets are positioned along the impeller body with each bearing set being similarly polarized so as to be in mutually attracting or mutually repelling relationship. A third passive magnetic bearing set is positioned along the impeller axis between the opposed ends with the third bearing set being magnetically coupled similarly to the first and second bearing sets, with the passive magnetic bearings creating an unstable negative force in a plane perpendicular to the axis of rotation of the impeller with the negative stiffness being overcome upon rotation of the impeller creating a centrifugal force of a magnitude greater than that of the unstable negative force.

Abstract: A magnetic drive sealless pump. The pump includes a casing having a fluid suction opening and fluid discharge opening. A shell is combined to the rear part of the casing, and the exterior of the shell is combined with a bracket having a motor for impelling and rotating a drive magnet. At the center of the shell is provided with a shaft enveloped with a bearing having a spiral fluid passage at the interior thereof. A capsule is provided between the bearing and the shell and at the interior of the capsule is provided with a driven magnet situated between the bearing and the drive magnet. The capsule is also extended into the casing and at the front of the capsule is provided with impeller. The impeller, capsule and bearing are integrated into one body for forming a rotating member having a thrust ring at the front and rear parts thereof, respectively, for preventing axial movements of the rotating member.

Abstract: An ultra-high speed vacuum pump evacuation system includes a first stage ultra-high speed turbofan and a second stage conventional turbomolecular pump. The turbofan is either connected in series to a chamber to be evacuated, or is optionally disposed entirely within the chamber. The turbofan employs large diameter rotor blades operating at high linear blade velocity to impart an ultra-high pumping speed to a fluid. The second stage turbomolecular pump is fluidly connected downstream from the first stage turbofan. In operation, the first stage turbofan operates in a pre-existing vacuum, with the fluid asserting only small axial forces upon the rotor blades. The turbofan imparts a velocity to fluid particles towards an outlet at a high volume rate, but moderate compression ratio. The second stage conventional turbomolecular pump then compresses the fluid to pressures for evacuation by a roughing pump.

Abstract: An impeller and at least a portion of a cooperating peripheral volute may be integrated into, and preferably are integrally injection molded with, concentric outer rotor and inner stator assemblies, respectively, to achieve a low profile precision impeller mechanism based on an improved brushless d.c. motor with low length (L) to diameter (D) ratio and suitable for use in a variety of other applications. In one practical embodiment of such a motor, a rotating cap has an inner circumference which is molded about an outer ferromagnetic back ring that in turn supports a permanently magnetized ring shaped rotor magnet having a number of poles of alternating polarity defined about its inner circumference and separated by a relatively small cylindrical air gap from the outwardly projecting radially oriented selectively magnetized poles of a fixed stator assembly. In one exemplary embodiment, the rotor may have 8 poles and the stator may have 9 poles.

Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.

Abstract: A fan/motor assembly having an integrated brush support and bearing retainer is disclosed. The fan/motor assembly includes a rotatable shaft, a working air fan coupled to the shaft, and a motor bracket and baffle assembly interposed between the working air fan and the motor assembly. The motor bracket and baffle assembly retains a bearing which rotatably receives the shaft and provides integral brush boxes for the motor assembly.

Abstract: A motor of this invention is provided with a sleeve-type bearing impregnated with oil for supporting a rotor assembly including a shaft and a rotor member. A lower face of the rotor is provided with at least two peripheral wall portions, an inner peripheral wall portion and an outer peripheral wall portion, which surround the shaft with a gap therebetween in a radial direction. The peripheral wall portions are accommodated in an annular recessed portion so as to surround an open space over a sleeve constituted the sleeve-type bearing and has a lower top of the most inner part. The lower end of the inner peripheral wall portion is located lower than the lower end of the outer peripheral wall portion, and the lower end of the outer peripheral wall portion is located lower than the lower top of the annular recessed portion.

Abstract: A heat-dissipating device is provided for generating primary airflow to dissipate heat generated by external heat sources as well as secondary airflow to dissipate heat generated from the interior of the heat-dissipating device. The heat-dissipating device includes a primary fan and a secondary fan coupled with a shaft of the primary fan. The secondary fan is rotated along the shaft to generate the secondary airflow and dissipate heat generated by the heat-dissipating device per se. Thus, the operation temperature of the heat-dissipating device can be lowered to increase its life span.

Abstract: A tubeaxial fan (10) broadly including a cylinder (12), a propeller (14) rotatably supported in the cylinder (12), and a drive assembly (16) operable to rotate the propeller (14) is disclosed. The propeller (14) includes blades (28,30,32,34,36,38) each having an inventive blade design. The inventive blade design presents a chord length (C), a stagger angle (?e), and a camber height (?c) that vary along each of the blades as shown in TABLE 1. The inventive blade design presents an external surface of each of the blades having a shape defined by the relative positioning of a plurality of coordinates contained in at least nine cross-sections (e.g., the blade (28) includes cross-sections (44,46,48,50,52,54,56,58,60)). The cross-sections (44,46,48,50,52,54,56,58,60) of the illustrated blade (28) have the corresponding plurality of coordinates listed in TABLE 2.

Abstract: A permanent magnet motor for driving a fan is rotated while a movement of the rotor in a direction of thrust of a rotary shaft with a rotation of the fan is prevented by magnetic attraction force of a permanent magnet and a stator core. A surface magnetic flux density of the permanent magnet facing the stator core is lower at an end portion than at a central portion of the permanent magnet in the direction of thrust of the rotary shaft.

Abstract: A wet-type rotor pump which is particularly suitable for feeding coolant in motorcar engines comprises a pump wheel. By the pump wheel, a feed medium is fed through an intake channel into a discharge channel. Via a common shaft, a motor armature of an electric motor is connected with the pump wheel. The motor armature is surrounded by a slit pot, feed medium flowing around the motor armature to cool it. The shaft is supported by two radial bearings, one radial bearing being arranged in a supporting element. The supporting element that is arranged within the intake channel further comprises an abutting surface on which a flow surface of the pump wheel abuts to take up axial forces.

Abstract: A mounting flange for housing a bearing cup of a roller bearing is disclosed. The mounting flange includes a recess sized to receive the bearing cup. A radial wall is defined by the recess and an outer periphery of the mounting flange. The radial wall includes at least one region of greater radial thickness than the radial thickness at another region. The at least one region of radial thickness defines at least one ear. The mounting flange also includes at least one flexibility pocket in the at least one ear. The flexibility pocket is configured to provide substantially uniform, radial deformation to the mounting flange when the bearing cup is fit into the recess.

Abstract: A fan includes a casing having a bottom wall and a shaft mounted inside the casing for rotatably supporting a rotary blade assembly comprised of blades inside the casing and above the bottom wall with the blade assembly being axially movable with respect to the shaft. A levitation device includes magnets mounted to the blades of the blade assembly and a magnetic field generator mounted in the bottom wall and opposing the magnets of the blades. The magnet field generator is controlled by a control circuit to selectively generate a magnetic field that interacts with the magnets of the blades to induce expelling force acting upon the blade assembly to axially move the blade assembly a predetermined distance away from the bottom wall. The magnitude of the expelling force can be changed by controlling the magnetic field generator whereby the distance between the blades and the bottom wall can be adjusted.

Abstract: An improved structure for rotational support for a heat-dissipation fan is disclosed, comprising a hollow ceramic bearing passing through and concentric with the fan rotor and rotating with said rotor, a hollow ceramic support bearing fixedly mounted to the base of the fan, and a hollow or solid ceramic axle tube passing through the inside of said bearing and rotating freely to reduce friction and allow high-speed rotation. The exterior surface of said bearing is ground or otherwise formed to provide better connection with the rotor, while the interior of the bearing and exterior of the axle tube are further processed to reduce contact area therebetween to reduce rotation friction. This improved structure has achieved reduced friction, reduced noise, reduced power consumption, longer life and higher rotational speed.

Abstract: A relative movement of a fan 1 toward a motor 2, which is one of the relative movements of the fan 1 with respect to a rotating shaft 23, is restricted by an inner ring 221 of a radial bearing 22. Due to this, the relative movement of the fan 1 toward the motor 2 is restricted by the inner ring 221 when the joining force between the fan 1 and the rotary shaft 23 is decreased, so that the contact between the fan 1 and the housing 21 can be prevented. Moreover, as the inner ring 221 rotates together with the rotating shaft 23, a rotational force is transferred from the inner ring 221 to the fan 1 in a state in which the relative movement of the fan 1 toward the motor 2 is restricted by the inner ring 221.

Abstract: An impeller includes a plastic disc, an annular array of vanes, a rotation support and regions of permanently magnetisable material. The plastic disc has an upper face and a lower face. The vanes are spaced around the periphery of the disc and extend from the upper face of the plastic disc. The rotation support is axially located and aligned through the disc. The regions of permanently magnetisable material encapsulated within said plastic disc for the formation of an annular array of magnetic poles.

Abstract: A pump includes an impeller, a stator, and a plurality of magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Hydrodynamic bearing surfaces are provided for generating a hydrodynamic bearing between the impeller and stator. The plurality of magnets may comprise a plurality of distinct magnetic elements or a single element comprising a plurality of distinct magnetic domains. The plurality of distinct magnetic elements or domains may be arranged to form a Halbach array.

Abstract: A centrifugal fluid pump apparatus includes a control mechanism; and a body 5 including a pump section having an impeller rotating inside a housing; a rotor having an impeller attraction magnet; a motor for rotating the rotor; an impeller attraction electromagnet for attracting the impeller thereto; an impeller-position detection sensor; and a groove for hydrodynamic bearing provided on an inner surface of the housing. The control mechanism has a position sensor output monitoring function or an electromagnet current monitoring function, a motor current monitoring function; and an emergency impeller rotation function. The impeller rotation function operates when the sensors or the electromagnet has a failure by using the position sensor output monitoring function or the electromagnet current monitoring function to rotate the impeller by utilizing the groove for hydrodynamic bearing.

Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.

Abstract: Electric motor driveable compressor (1), in which the electric motor includes a rotor with rotor shaft (20), which acts in cooperation with a stator (50) provided in the motor housing (52, 56, 58, 60), the rotor shaft (20) being mounted on the motor housing (56, 58, 60) via at least two bearings (46) and connected fixed against rotation with the compressor wheel (10) at an axial receiving segment (30), wherein the rotating components, comprised essentially of the rotor with rotor shaft (20) and compressor wheel (10), are so designed, that their first critical bending fundamental frequency w1 lies above the maximal operationally occurring rotation speed nmax.

Abstract: The ultimate in suplicity and reliability, an axial-flow blood pump is supported by an all passive contact-free hybrid bearing suspension that can measure differential pump pressure. The preferred suspension consists of a radial hydrodynamic journal bearing with axial magnetic thrust bearings. The thrust bearing consists of repulsion magnet pairs positioned at each end of the rotor. This holds bidirectional loads with a stable restoring force (negative axial stiffness). Rotor axial position shifts with load and is monitored with a position sensor to inherently provide pump differential pressure (which may be used to physiologically control pump flow rate). The hydrodynamic radial and “smart” axial magnet thrust bearings use large gaps to eliminate hemolysis and are actively washed out under pressure with fresh blood to eliminate thrombosis.

Abstract: A rotary blood pump is provided which includes a pump housing and a rotor mounted for rotation with the housing. The rotor has an impeller. A rotor motor is provided including a plurality of permanent magnets carried by the impeller. A first motor stator is positioned on one side of the impeller and a second motor stator is positioned on an opposite side of the impeller. The motor stators each include a plurality of electrically conductive coils and pole pieces located within the housing. A plurality of wedge-shaped hydrodynamic thrust bearings are located outside of the axis of the rotor. During rotation of the impeller, the hydrodynamic bearings are separated from the housing by a fluid film and are not in direct mechanical contact with the housing.

Abstract: A novel fluid pump comprising a stator body defining a pumping chamber and an impeller operationally disposed within the chamber. The impeller has opposed ends with a central axis defining an axis of rotation, with magnetic driven means disposed on the impeller and positioned outwardly of the impeller axis between the opposed ends. Passive magnetic bearing sets are positioned along the impeller body with each bearing set being similarly polarized so as to be in mutually attracting or mutually repelling relationship.

Abstract: A heat-dissipating fan of the invention has an axle, a bearing, a rotor and a stator. The axle and the bearing are made of a ceramic material, and are located at a central location of the rotor and the stator. The bearing is a hollow cylinder integrally formed into a single body, and has a central hole and a recess at its bottom. The axle penetrates through the central hole of the bearing to contact the recess. A magnetic force center of the silicon steel sheet is at a level lower than that of the magnetic bar to generate radial and axial force components, allowing stable rotation of the rotor. The heat-dissipating fan of the invention provides advantages such as low friction, lower noise, low energy consumption, high performance and high stability.

Abstract: A compact turbo-molecular pump having a high depressurizing capability. A motor for rotating a rotor vane includes an air bearing. The air bearing has a rotary cylinder and a fixed surface surrounding the rotary cylinder. The material of the rotary cylinder has a coefficient of thermal expansion that is smaller than that of the material of the fixed surface. Thus, change in the dimensions of the rotary cylinder is smaller than that of the fixed surface even if the temperature of the air bearing rises during operation of the pump. Thus, the rotary cylinder avoids contact with the fixed surface.

Abstract: An ultra-thin pump of the present invention includes a ring-shaped impeller including many vanes arranged along its outer region and a rotor magnet at its inner region, a motor stator provided in a space encircled by an inner peripheral surface of the rotor magnet of the impeller, and a pump casing that includes a suction port, a discharge port and a cylinder disposed between the motor stator and the rotor magnet and houses the impeller. The impeller is rotatably supported by the cylinder. A cooling system of the present invention includes a cooling device for cooling a heat-producing device by heat exchange using coolant, a radiator for removing heat from the coolant, and the ultra-thin pump for circulating the coolant. The ultra-thin pump is simple in structure, operates efficiently and can be manufactured at low cost, and the cooling system is thin in structure and performs efficient cooling.

Abstract: Disclosed are a magnetic bearing device with a vibration restraining function, a magnetic bearing device with a vibration estimating function, and a pump device with the magnetic bearing devices mounted thereto, in which it is possible to realize a reduction in vibration in the apparatus system as a whole inclusive of the equipment associated with the vacuum pump without newly providing a vibration sensor. In a vibration detector, a multiplication result obtained by multiplying the Laplace transformation of a displacement of a rotor by a predetermined transfer function is added to a multiplication result obtained by multiplying the Laplace transformation of a variation in an unbalance force acting on the rotor by the reciprocal of the mass of the rotor. The result of this calculation is reversed in polarity and is added to the output of a compensator by an adder.

Abstract: A pump includes an impeller, a stator, and a plurality of magnets forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils coupled to the other of the stator and the impeller. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Hydrodynamic bearing surfaces are provided for generating a hydrodynamic bearing between the impeller and stator. The plurality of magnets may comprise a plurality of distinct magnetic elements or a single element comprising a plurality of distinct magnetic domains. The plurality of distinct magnetic elements or domains may be arranged to form a Halbach array.

Abstract: An apparatus to render the shield of a bail bearing unnecessary and to improve the lubricity inside a fan motor is presented. A bearing housing is integrally formed with a base of the fan motor, and a shield part is formed at one end of the bearing housing. A ball bearing, spacer and sleeve bearing are set inside from the other end of the bearing housing, and these are fixed in place by pressing in a retainer cap. The interior of the bearing housing is then shielded at each end by the shield part and the retainer cap, making the need for a shielded ball bearing unnecessary. A rotational shaft, to which a rotor and impeller are attached, is supported by the ball bearing and the sleeve bearing. Inside the bearing housing, lubricating oil passes back and forth between the ball bearing and sleeve bearing, thereby enabling the elimination of insufficiencies in lubricating oil, and improving lubricity.

Abstract: A component, such as a submersible motor, having a lubrication distribution system. The component includes an outer housing having a rotatable shaft disposed within the housing. The shaft is supported by one or more bearings and a lubricant is disposed within the housing. A conduit is provided for conducting a lubricant from the lubricant pump to desired locations, such as the one or more bearings.

Abstract: A progressive cavity pump pumps liquid downhole to a lower formation past a packer set in a casing of a wellbore. The rotor of the pump is axially restrained by a bearing assembly spaced below the pump for controlling uphole reactive loading on the rotor. Preferably the rotor is releasably coupled to the bearing assembly for release and recovery of the rotor from the bearing assembly. Such a releasable coupling is a latch comprising a plunger telescopically and releasably coupled with a housing using a dog and track arrangement, the dog and track utilizing the telescoping action to actuate the coupling and releasing of the latch.

Abstract: A mini fan mounting arrangement in which the stator has an annular locating flange at the center of the top insulation frame thereof, and the fan blade assembly has a plurality of springy hooks equiangularly spaced around the center shaft thereof and respectively hooked in the annular locating flange to secure the fan blade assembly to the stator for enabling the fan blade assembly to be rotated on the stator.

Abstract: The invention concerns a blood pump, in particular a ventricular cardiac support pump, with formed in a pump housing a blood chamber which is designed to hold a rotor rotatable about a rotor axis and at opposite ends in sections forms an inlet connectable with an inlet cannula, where an outlet from the blood chamber connectable with an outlet cannula extends in a direction perpendicular to the rotor axis, and where the rotor axis at its ends is mounted rotatably in mechanically active bearings provided in the area of the inlet concerned and connected with the pump housing.

Abstract: A fuel pump for supplying fuel drawn from a fuel tank into an internal combustion engine comprises a rotor, a rotation shaft, bearing members and a drawing force generative means. The rotation shaft revolves integrally with the rotor. The bearing members support both axial ends of the rotation shaft. The stator is disposed on an outer circumference of the rotor and surrounds the rotor. The drawing force generative means generates drawing force for drawing fuel from the fuel tank by means of rotation force of the rotor. The rotor has a recess in a center of its axial end portion. Moreover, at least one of the bearing members is disposed in the recess.

Abstract: A pipe member is pushed into an inner periphery of a core of an armature to fix the pipe member to the armature. The pipe member is inserted over a fixed shaft. Bearing members have a small hole and a large hole formed at their centers. Pipe member ends are pushed into and fixed to the large diameter holes. The fixed shaft is inserted into the small holes to rotatably support the armature. A guide hole is formed at the center of an impeller of a pump unit, and is fitted to the bearing member, thereby the impeller rotates while the impeller is guided by the outer peripheral surface of the bearing member which rotates integrally with the armature. Coupling protrusions formed on the armature are inserted, and engaged with engagement recesses formed in the impeller to transmit a rotation force of the armature to the impeller.

Abstract: An articulated seal for use with polished rod and rotary drive head assemblies is described. In particular, an articulated seal assembly or system 10 is described which seals a rotating drive head and polished rod between high pressure internal fluids within a well 12 and the exterior while absorbing the normal wobble motion of a rotating polished rod.

Abstract: A fan/motor assembly having an integrated brush support and bearing retainer is disclosed. The fan/motor assembly includes a rotatable shaft, a working air fan coupled to the shaft, and a motor bracket and baffle assembly interposed between the working air fan and the motor assembly. The motor bracket and baffle assembly retains a bearing which rotatably receives the shaft and provides integral brush boxes for the motor assembly.

Abstract: A centrifugal pump with an integrally-constructed electrical motor. The motor has a hemi-spherical rotor mounting the impeller and comprising at least two permanent magnetic poles. The rotor is balanced on a spherical bearing including a ball or a hemispherical structure mounted at the end of a shaft engaged into an axial cavity in the smallest end of the rotor. A thin, waterproof and static septum is positioned in the air gap between the stator and the rotor. The annular stator includes a bowl-shaped yoke and a winding, applied to the inner surface of the yoke, comprising segments running in successive alternate sections obliquely to the motor's axis of rotation between the upper and lower rims of the yoke. Due to the geometry of the motor, the residual magnetic forces urge the rotor toward a balanced position against the shaft and bearing.

Abstract: A fan (1) includes a housing (20), a vane assembly (40), and a sealing device (70). The housing includes a base portion (22), a bearing sleeve (24), a self-lubricating bearing (26) received in the bearing sleeve, and a lubricant insulation ring (28) received in the bearing sleeve. The vane assembly is rotatably attached in the housing, with a central rod (44) of the vane assembly extending through the bearing and the lubricant insulation ring. The sealing device is attached to the base portion such that the bearing is sealed in the bearing sleeve between the lubricant insulation ring and the sealing device. A sealing ring (80) of the sealing device is disposed in an annular groove (39) defined in the base portion, and is pressed tightly between the sealing lid and the base portion.

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 (11) running in a split tube (10). The rotor space (17) is separated with respect to the stator (9) in a fluid-tight manner. On running the motor to its operational rotational speed the fluid located in the rotor space (17) due to the increasing rotational speed evaporates and is removed so that the motor finally functions as a dry-runner.

Abstract: In a centrifugal flow blood pump, usable in left ventricular assist applications, blood is pumped from an inlet (16) to an outlet (22) by a primary impeller (18). A portion of the blood that enters the pump follows a secondary channel (24) where a secondary impeller (70) routes the blood to lubricate a bearing between an impeller assembly (14) and a post formed by a component of the pump housing. The unique shape of the secondary impeller (70) prevents blood stagnation and provides for a well-washed fluid bearing.

Abstract: A fluid pump includes a pump housing having a housing cavity with an inlet and an outlet. A diffuser is located within the housing cavity, and includes a portion that is attached to the housing. The diffuser has a diffuser cavity, in which a stator assembly and canister are located. The canister provides a seal where it contacts the diffuser; this isolates the stator assembly from the fluid. The stator assembly provides a magnetic field which drives a rotor assembly. The rotor assembly rotates an impeller, which pumps the fluid from the inlet to the outlet.

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

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

Abstract: A fan includes a blade assembly rotatably supported in a frame. The blade assembly includes a cylinder having an outer surface to which blades are mounted and an inner surface to which magnets are mounted. The blade assembly has an axle concentric with the cylinder. The frame includes a casing made of silicone steel that is fixed inside the frame and supports a bearing device. The bearing device defines a central bore rotatably receiving the axle of the blade assembly therein with the cylinder of the blade assembly fit over and spaced from the casing. Windings of conductive wires are encased and fixed in the casing and surround the bearing device for being electrically powered to generate a magnetic field that interacts with the magnetic means of the blade assembly to rotate the blade assembly. The casing includes opposite upper and lower disks with tabs extending between the upper and lower disks.