Abstract: One aspect of an intravascular ventricular assist device is an implantable blood pump where the pump includes a housing defining a bore having an axis, one or more rotors disposed within the bore, each rotor including a plurality of magnetic poles, and one or more stators surrounding the bore for providing a magnetic field within the bore to induce rotation of each of the one or more rotors. Another aspect of the invention includes methods of providing cardiac assistance to a mammalian subject as, for example, a human. Further aspects of the invention include rotor bodies having helical channels formed longitudinally along the length of the body of the rotor where each helical channel is formed between peripheral support surface areas facing radially outwardly and extending generally in circumferential directions around the rotational axis of the rotor.

Abstract: A vacuum pump comprises a first pumping section 106, and, downstream therefrom, a second pumping section 108. The pump comprises a first pump inlet 120 through which fluid can enter the pump and pass through both the first and second pumping sections towards a pump outlet, and a second pump inlet 122 through which fluid can enter the pump and pass through only the second pumping section towards the outlet. The second pumping section 108 comprises at least one turbo-molecular pumping stage 109a, 109b and, downstream therefrom, an externally threaded rotor 109c.

Abstract: The invention discloses at least one blade extending away from a beginning point and longitudinally along a central axis and approximating the shape of a spiral about said central axis. The blade comprises a beginning point disposed a first lateral distance away from the central axis and a terminating point disposed a second lateral distance away from the central axis, the second distance being greater than the first distance.

Abstract: A vertical axis turbine and method of making same is disclosed. The device and method comprise a plurality of blades rotatably disposed around an axis of rotation at a plurality of blade locations, each blade being twisted at a first angle about its longitudinal axis, each blade having its distal ends located a predetermined distance from the axis of rotation, each blade being bent at one or more central locations along the longitudinal axis so the one or more central locations are the same predetermined distance from the axis of rotation as the distal ends, each blade having a foil cross section perpendicular to the axis of rotation for maintaining unidirectional rotation of that blade about the axis of rotation in a fluid flow, and each blade having its longitudinal axis tilted at a second angle with respect to the axis of rotation.

Abstract: A helical multi-piece auger that is rotatable by a moving fluid for the generation of energy is provided. The helical multi-piece auger may include several interior pieces and two tapered end-pieces mounted on a central shaft. The pieces may include an outer spiral flange perpendicular, in both directions, to a portion of helical auger. Each tapered end-piece may be tapered with respect to both the outer diameter of a helical auger portion, and the width of an outer spiral flange. Each tapered end-piece may have an outer edge that effectively merges with the central shaft of the multi-piece auger over a radial arc of between 90 and 180 degrees. The helical multi-piece auger may include wing-shaped nose cones that are axially offset with respect to each other and house hydraulic components. The helical multi-piece auger may be rotatable by the moving fluid to facilitate generation of energy.

Abstract: The invention generally relates to turbines that efficiently process air or fluid flow while producing substantially no vibrational effects. In certain embodiments, the invention provides a turbine including a rotatable shaft, and at least one blade connected to the rotatable shaft, in which the blade includes a helical shape and an angle of about 180° or greater.

Abstract: An impeller plate of an impeller of a centrifugal pump, particularly a channel impeller pump, for pumping liquids with solid or gaseous admixtures, is provided with at least one wide vane that is displaced toward the impeller drive by a distance D so that the impeller chamber is enlarged by a rearward portion thereof. In addition, the impeller comprises at least one auxiliary vane having a center width at between 25%-75% of the width of the wide vane. This arrangement improves particularly the gas transporting ability of the pump.

Abstract: A water powered turbine (1) comprises a main support frame-work (2) which rotatably carries a rotor (3) comprising a main shaft (5) to which three blades (7) are attached by carrier discs (8) and (9). The carrier discs (8, 9) are rigidly secured to the main shaft (5), and the blades (7) are pivotally connected to the discs (8) and (9) by pivot shafts (16) and (17). Each blade (7) is of constant hydro-foil cross-section along its entire length and defines a first upper spiral (12) and a second lower spiral (13). The first spiral (12) extends from a first end (10) which is coupled to the main shaft (5) by the carrier disc (8), and the second spiral (13) of each blade (7) extends from a second end (11) of the blade (7) which is coupled to the main shaft (5) by the carrier disc (9). The first and second spirals (12) and (13) are of opposite hand and extend from the respective first and second ends (10, 11) to meet midway between the respective first and second ends (10, 11).

Abstract: A helical turbine with a circular member attached to one end for redirecting axially flowing fluid into perpendicularly flowing fluid. A fluid diverter for redirecting substantially perpendicular flowing fluid into axially flowing fluid. A hollow circular member attached to an opposite end of the turbine allowing substantially axial flowing fluid into one end of turbine. A drive shaft of at least one generator is in continuous contact with the peripheral edge of the solid or hollow circular member producing faster rpm. A turbine assembly mounted on a rooftop utilizing accelerated wind. Fluid diverters increasing fluid flow into the helical turbine's receding blades. A fluid diverter preventing fluid from hitting turbine's oncoming blades. A tail section for maintaining optimal direction into oncoming fluid. Two counter rotating turbines where the attached circular member's edges are in continuous contact.

Abstract: A fluid circulation system wherein circulation is caused within a body by establishing a ring vortex within the fluid generated by an impeller designed in accordance with the Golden Section or Phi Geometry.

Abstract: A helical auger turbine and hydrokinetic device for use with electrical generators for producing electricity. The auger turbine includes a generally helical turbine blade rotatably mounted on a central shaft, which may be tapered at each end, and a flange extending perpendicularly to an edge of the turbine blade. At least one turbine blade support connection is included for connecting the central shaft to a support structure. An electrical generator may be powered by the helical auger turbine, that can be used in a tidal water flow. The helical auger turbine can operate a high pressure pump connected to a hydraulic accumulator for storing pressurized hydraulic fluid from the high pressure pump. An electrical generator can be operated by hydraulic fluid delivered from the hydraulic accumulator at times of slow water flow. A plurality of helical auger turbines can be horizontally oriented under water, tethered to legs of an ocean platform such as an oil rig secured to the seabed.

Abstract: A two blade row inducer for a low pressure pump in a turbopump of a rocket engine. The inducer includes a first set of blades and a second set of blades or partial blades in which the partial set of blades is covered with a shroud and the shroud includes a row of turbine blades extending outward to form a turbine to drive the inducer. The first set of blades is spiral or screw thread blades that end just upstream from the leading edges of the second set of blades covered with the shroud. In another embodiment, the screw thread blades can extend toward the aft end of the inducer and in-between adjacent partial blades in which the shroud also covers the aft ends of the screw thread blades. A second fluid reacts with the turbine blades to rotate the inducer and pump the first fluid.

Abstract: Rotor-type super windmill based on logarithmic spiral-shaped load-bearing elements represents a single block of two vertical rotors having inverted curvature of load-bearing elements producing in the rotary mode in the inter rotor space circulation of velocity of both rotors in one direction and ensuring summation thereof with the velocity of the air flow.

Abstract: An improved wind energy generator is described. This invention is a wind turbine that utilizes airfoils in unique designs that are made of lightweight materials. The turbine is manufactured by low cost production methods as portable units that are stacked in series to provide for significant power harvesting. The use of three dimensional twisted airfoils enable high efficiency and easy start up.

Abstract: New design of wind and or water mill, which utilizes natural motion to create electricity. Using a spiral shape design compared to the traditional wind and or water mill designs already in use today. Using a spiral shape design with a tapering angled blade and or size and or a guide, the blades should allow for less drag and increase wind and or water spiral affect efficiency. And the Spiral Design can also be used to replace traditional propellors, efficiently utilizing the motion for thrust.

Abstract: A wind turbine system includes a two-dimensional array of a plurality of modular wind turbine units arranged in a plurality of horizontal rows and vertical columns. The two-dimensional array of modular wind turbine units are carried by a frame structure including a plurality of parallel beams extending along a first orthogonal axis and spaced from each other along a second orthogonal axis, with the plurality of modular wind turbine units mounted between each pair of the parallel beams extending along the first orthogonal axis. Also described is a modular wind turbine unit particularly useful in such a system.

Abstract: A turbine, suitable for use as a water or wind turbine, for generating rotary motion from fluid flow wherein the axis of rotation of the turbine is transverse to the direction of flow. The turbine has two foils, which may meet at the axis of rotation, and the turbine is helical and tapered. The turbine has a quasi-conical base. The non-mount end of the turbine is preferably tilted downstream with the turbine axis of rotation in the range of about 5° to 15° from perpendicular to the flow direction.

Abstract: A variable axis turbine may include multiple nested rotatable rotor assemblies. The turbine may be self-starting in slow fluid conditions while simultaneously self-limiting in fast fluid conditions. The turbine may provide omni-directional energy recovery and be self-balancing. The nested rotatable rotor assemblies may be configured to rotate independently of each other, but along the same rotational axis. Each outer nested rotor blade set may direct fluid onto the inner rotor blade sets in an aerodynamically beneficial manner. Each rotor blade set may be interconnected with a rotating generator hub that encloses a rotating generator element that rotates along with a corresponding rotor blade set for electric power generation. The blades may be “smart blades” that are sufficiently flexible to be self-configuring during rotation and soft enough to partially absorb sound. The blades may have a variable hardness and a two or more dimensional twist.

Abstract: A turbine blade particularly useful in a vertical-axis wind turbine, characterized in that the blade includes a central region of a symmetrical airfoil configuration, and opposite end regions of a non-symmetrical airfoil configuration effective to increase the drag forces produced by the wind at the end regions when the turbine blade is used in a vertical-axis wind turbine provide a self-starting capability, and a speed-limiting capability, to the wind turbine. In one described embodiment, the non-symmetry in the sharp trailing edge of the blade is produced by a deep recess extending inwardly past the chord line of the blade to enhance the self-starting and speed-limiting capabilities; whereas in another described embodiment, the non-symmetry is produced by a shallow recess and outwardly-flared ends enhancing the efficiency of the wind turbine during normal wind conditions.

Abstract: An axial tip turbine driven pump in which a first fluid pumped by an inducer is driven by a second fluid that reacts with a turbine blade extending from a shroud on the inducer. The inducer includes a set of screw thread blades and a second set of partial blades that are covered by a shroud in the aft section of the inducer. A row of turbine blades extends from the shroud and into a manifold that forms the outer casing for the pump. The fluid flow through the manifold reacts with the turbine blades and drives the inducer to pump the fluid from the inlet and through guide vanes downstream from the inducer. The fluid passing through the turbine blades is collected in an outlet collector manifold and discharged into the fluid flowing through the guide vanes. The inducer with the turbine blades is rotatably supported within the housing formed by the guide vane support member and the manifold casing. The swirl flow direction of the turbine blades is opposite to that of the swirl flow in the inducer.

Abstract: In one aspect, a wind turbine blade assembly includes a central shaft defining an axis of rotation and a plurality of helically twisted blades supported on the central shaft. The helically twisted blades have an inner edge and an outer edge, and at least a portion of the helically twisted blades is radially spaced apart from the central shaft. In another aspect, a wind turbine apparatus employing the wind turbine blade assembly is provided.

Abstract: A propeller attached to an output shaft of a boat motor is provided. The propeller may have a plurality of blades which define a leading edge. The leading edge may define leading edge angles which increase in a logarithmic manner from a base of the blade to a tip of the blade. This allows the blades of the propeller to cut and shed seaweed and/or kelp off of the blades when the boat is maneuvered into waters containing seaweed and/or kelp. Additionally, boats that employ the propeller of the present invention are quieter compared to boats that utilize prior art propellers.

Abstract: A helical auger turbine and hydrokinetic device for use with electrical generators for producing electricity. The auger turbine includes a generally helical turbine blade rotatably mounted on a central shaft, which may be tapered at each end, and a flange extending perpendicularly to an edge of the turbine blade. At least one turbine blade support connection is included for connecting the central shaft to a support structure. An electrical generator may be powered by the helical auger turbine, that can be used in a tidal water flow. The helical auger turbine can operate a high pressure pump connected to a hydraulic accumulator for storing pressurized hydraulic fluid from the high pressure pump. An electrical generator can be operated by hydraulic fluid delivered from the hydraulic accumulator at times of slow water flow. A plurality of helical auger turbines can be horizontally oriented under water, tethered to legs of an ocean platform such as an oil rig secured to the seabed.

Abstract: A turbofan engine of the invention is provided with a fan first-stage moving blade for taking an air therein, and a spinner rotationally driving the fan first-stage moving blade, the spinner has a spiral blade extending spirally to an outer side in a radial direction, sucking the air from a front face of the spinner and supplying the air to the fan first-stage moving blade. Further, the fan first-stage moving blade and the spinner are integrally coupled, and the spiral blade and the fan first-stage moving blade are formed such that blade surfaces are smoothly connected.

Abstract: A unit for conversion of fluid stream energy into electric energy is proposed, in one embodiment comprises two turbines rotatable in opposite directions, furnished with aerodynamically-profiled blades, each having a ‘V’-shape evolvement blank, then bent to produce a helix line wound upon a cylindrical surface, and an electro-generator including two short-circuited rotors coupled with the blades and an immovable inductor with a three-phase winding, magnetically associated with the rotors. The inductor includes a yoke, teeth located at each its side, stationary magnetic plates attached to the unit's structure via non-magnetic insertions. The winding is composed of coils comprising wires placed between the teeth, wherein the active sides of two phase coils are shifted relatively to each other being parallel to the longitudinal axis of said inductor, and phase-wise are oppositely shifted, wherein the two phase coils are situated adjacently to a third phase coil from the opposite sides thereof.

Abstract: The present invention is directed to a pump arrangement for use in a gear box housing. The interior surface of the gear box housing has a collection wall arranged in the interior surface of the housing. A shaft is rotatably disposed through the gear box housing and has a longitudinal bore extending through the shaft that provides a lubrication delivery arrangement for distributing lubricant through the gear box housing. A pump housing circumscribes the shaft and has a discharge cavity connected to the longitudinal bore. Additionally, the pump housing has an inlet port for receiving lubrication from the collection wall. Contained within the pump housing is a pump member that has an impeller face and helical threaded surface that pressurizes and introduces the lubricant into the lubricant delivery arrangement.

Abstract: The invention relates to wind-power engineering and makes it possible to form a swirling vortex stream, to reduce a blade aerodynamic drag, to increase a stream kinetic energy and to reduce a converter power losses. The inventive method for a stream vortex transformation consists in guiding an input three-dimensional stream towards the internal concave blade surfaces (7) and in forming vortex cords thereon with the aid of vortex cord formers (8) which are arranged at an angle to the blade axis of rotation. A vortex converter comprises an axis and helical blades connected thereto with the aid of steppedly arranged holders and posts. The blade is a thin-shaped, has an aerodynamic profile shape and consists of at least two layers connected to each other. The vortex cord formers (8) are arranged on the internal concave surface (7) of a collecting layer across the blade and the cross section thereof is embodied in a saw-like form and has asymmetrical sides, the smallest of which is caved-in in an arc-like manner.

Abstract: The present invention is directed to a turbine comprising a plurality of blades that rotate in a single direction when exposed to fluid flow, wherein the plurality of blades are joined to the central shaft by a plurality of radial spokes disposed substantially perpendicular to the central shaft such that the rotating plurality of blades causes the shaft to rotate. The plurality of blades has a uniform airfoil-shaped cross section, where the airfoil cross section presents a non-zero angle of attack to the current. The plurality of blades wind in a spiral trajectory, rotating around the central shaft and having a variable radius along the length of the central shaft such that a distance measured from the plurality of blades to the center shaft is greater near the center of the turbine than at either end.

Abstract: A beam jet propeller is provided, especially a beam jet propeller which increases the friction force of the fluid by spiral or linear diversion protrusions or diversion grooves on the inner wall of a tube, such that original loose fluid can be twisted together into a beam shape under pressure/rotation/extrusion and form inter-tube pressure. The beam fluid may generate a strong propelling force. Meanwhile, because less air is included in this beam fluid, the bubble friction is smaller and acoustic noise is greatly decreased. The present invention does not adopt a traditional propeller as the propelling device, therefore, the cavitation due to Bernoulli theorem is not generated, and the problem of resistance force and drag force in the fluid is also eliminated. The propelling force is thus greatly increased.

Abstract: Apparatus for the generation of electrical or mechanical energy from a flowing fluid. The apparatus includes at least one blade of substantially helical configuration. The blade has a plurality of blade sections. Action of the flowing fluid on the blade causes it to rotate around its axis. The rotational motion is used to generate electrical or mechanical energy. Also disclosed is a helical blade wherein the pitch length and/or radii varies along the length of the helical blade profile.

Abstract: An improved high performance inducer for a pump assembly includes a set of primary blades and splitter blades to achieve a vapor-to-liquid ratio up to 1:1. Minimum back pressure is provided at the leading edge to aid in getting fluid into the blades where the vapor component of the pumped fluid is removed. A hub increases in diameter over the axial extent of the helical blades, thereby resulting in a decreasing depth of the blades between the inlet and outlet of the inducer. A substantial improvement in removing fluid from a storage reservoir is obtained resulting in a substantial savings in shipping costs.

Abstract: A wind harnessing system comprises a substantially grooved shell disposed about a rigid frame. The grooved shell can be constructed of lightweight shell panels connected to one another and to the frame. Alternatively, the grooved shell can be constructed of inflatable shell sections.

Abstract: A method and apparatus related to the utilization of flowing medium is provided including a turbine blade comprising at least one protrusion along at least a portion of a surface of said blade and a twisted portion.

Abstract: A cooling fan comprising a housing that connects to a chassis that is operable to support an electronic component. An axial duct runs through the housing. A blade assembly is rotatably disposed within the duct and comprises a plurality of fan blades that extend radially from a hub to a fan diameter. The axial duct has a chord length at least equal to the fan diameter. A motor assembly is disposed within the axial duct and coupled to said blade assembly. The cooling fan provides a cooling capacity of at least 1.5 air horsepower per cubic inch volume of the cooling fan.

Abstract: In one embodiment, a turbine for use in a wind-based power generation system includes a plurality of separate blade parts that contain locating and coupling structures to permit the separate parts to be coupled to one another in a stacked manner to form a shaped blade of the turbine.

Abstract: This three dimensional ornament is designed to be suspended in outdoor situations where it is free to rotate in the wind and thereby enhance the aesthetic qualities of the area in which it is deployed and to make the wind velocity visible. The ornament is a turbine type section with an open interior section that may be filed with various decorative plates or spirals.

Abstract: The present invention is concerned with an axial-flow or mixed-flow inducer (3) which is disposed upstream of a main impeller (2) for improving the suction capability of a pump such as a turbopump. In the inducer (3), a blade angle (?bt) from a tip (T1) to a hub (H1) at a blade leading edge (31) is substantially the same as an inlet flow angle (?1?t) at a designed flow rate.

Abstract: A pump assembly including a pump, a pump frame and a motor, the pump including a pumping member which is mounted in a pump housing, relative rotation of the pumping member with respect to the pump housing causing pumping of fluid, and the motor including a rotor and a stator, operation of the motor causing rotation of the pumping member relative to the pump housing, wherein one or two of the stator, pumping member and pump housing is fixed relative to the pump frame, a resilient support part being provided between the pump frame and each of the other two or one of the stator, pumping member, and the pump housing, the resilient support part or parts permitting movement of the stator, pumping member or pump housing with respect to the pump frame.

Abstract: A wind power generating apparatus having a plurality of rotary wings can reduce the load and resistance on the rotary wings due to wind to obtain a highly effective rotation power as well as to flexibly absorb the impact applied to the rotary wings due to varying wind pressure. Each one of the rotary wings has a radius of rotation different from the others and rotates separately according to the direction of the wind, by which the rotation power resulting from load and resistance in the integrally elongated rotary wings in relation to the wind is prevented from being canceled, and the wind acceleration via the accelerator covers and the wind distribution to the rotary wings result for highly efficient rotation power.

Abstract: A fan assembly includes a vertical axis wind turbine (VAWT) which is coupled to an air extraction or air supply fan. The VAWT is located above and is coupled coaxially to the fan. The fan assembly also includes an auxiliary turbine to provide start-up torque to initiate rotation of the VAWT. The VAWT is typically a Darrieus-type turbine and the auxiliary turbine is typically a Savonius-type turbine. In the preferred embodiments, the fan assembly includes a rotational speed governor to avoid damage to the turbine and/or fan in high winds.

Abstract: A screw compressor includes a housing and a screw rotor disposed in the housing and rotatable relative to the housing for compressing a refrigerant, the housing and the screw rotor having a rest condition, and an operating condition wherein at least one of the housing and the rotor deflect from the rest condition, and structure for at least one of reducing deflection from the rest condition and evenly distributing deflection from the rest condition when the rotor is in the operating condition, whereby clearance between the housing and the rotor is optimized in the operating condition.

Abstract: A ribbon drive pumping apparatus and method for substantially incompressible fluids, such as liquids, is disclosed. The pump has an extended tube having an intake at a first end and an outlet at a second end. A ribbon formed of helical coils is mounted in the tube for rotation and the frequency of the coils decreases from the first end to the second end of the tube. Substantially incompressible fluid is collected at the first end, an axial component of velocity is increased via the rotating ribbon, and the substantially incompressible fluid is ejected from the second end to provide pumping of the liquid. Additional fluid is added to an interior portion of the pump, preferably to a low pressure region, for various purposes such as mixing, cavitation prevention, increased throughput, etc.

Abstract: A swirling compressor comprises a number of swirling tubes and a motor, each swirling tube has a fixture at a center portion with a flange bulging out from one side and a hole at the other end of the center portion opposing the flange, an aperture is formed close to the center end at the inside of the tube, this fixture design allows the swirling tube to pile up with one over the other forming a wind passage, and a spindle of a motor is inserted through the hole and secured thereat. When the motor driven the swirling tubes set to spin, each tube collects a portion of whirlwind, and all whirlwind will be blown out from the fixture.

Abstract: A swirling compressor comprises a number of swirling tubes and a motor, each swirling tube has a fixture at a center portion with a flange bulging out from one side and a hole at the other end of the center portion opposing the flange, an aperture is formed close to the center end at the inside of the tube, this fixture design allows the swirling tube to pile up with one over the other forming a wind passage, and a spindle of a motor is inserted through the hole and secured thereat. When the motor driven the swirling tubes set to spin, each tube collects a portion of whirlwind, and all whirlwind will be blown out from the fixture.

Abstract: The ribbon drive pump has an extended tube having an intake at a first end and an outlet at a second end. A ribbon formed of helical coils is mounted in the tube for rotation and the frequency of the coils decreases from the first end to the second end of the cube. Liquid is collected at the first end, an axial component of velocity of the liquid is increased via the rotating ribbon, and the liquid is ejected from the second end to provide pumping of the liquid.

Abstract: A method and apparatus is disclosed for pumping a material, especially thick, gas-containing, fiber suspensions for wood processing. The apparatus includes a centrifugal pump with a rotor having blades twisted such that the pitch of the blade changes along the length of the rotor.

Abstract: A ribbon drive pumping apparatus and method for liquids is disclosed wherein the inherent centrifugal separation that occurs adjacent the pump inlet is used to remove contaminants. The pump has an extended tube having an intake at a first end and an outlet at a second end. A ribbon formed of helical coils is mounted in the tube for rotation and the frequency of the coils decreases from the first end to the second end of the tube. Liquid is collected at the first end, contaminants are centrifugally separated and sorbed or bled off, an axial component of velocity of the liquid is increased via the rotating ribbon, and the purified liquid is ejected from the second end to provide pumping of the liquid. A central opening helps decrease cavitation and can be useful for pumping live fish.

Abstract: A multiple-type pump has a simple construction and superior durability. The multiple-type pump has the capacity to perform air evacuation at high velocities in the atomospheric pressure zone to high vacuum zone range. The multiple-type pump includes: a screw type pump air transfer portion arranged at a downstream portion of the outer surface of a rotor and has a plurality of screw threads and screw grooves with a width of 5 mm or more; a turbo-molecular type pump air transfer portion arranged at an upstream portion and has a plurality of vanes and air transfer grooves; vanes having vane widths of 3 mm or less at the upstream edge, and formed so that the downstream edge is continuous with the upstream edge of the screw threads; a downstream edge of the base of the air transfer grooves formed so as to be continuous with the upstream edge of the base of the screw grooves.

Abstract: A ribbon drive pumping apparatus and method for liquids is disclosed. The pump has an extended tube having an intake at a first end and an outlet at a second end. A ribbon formed of helical coils is mounted in the tube for rotation and the frequency of the coils decreases from the first end to the second end of the tube. Liquid is collected at the first end, an axial component of velocity of the liquid is increased via the rotating ribbon, and the liquid is ejected from the second end to provide pumping of the liquid.

Abstract: The oil field tool motor is particularly suited for use in the oil well shaft environment wherein the temperature within the shaft can climb to nearly 400° F. and wherein the temperature within the motor can drop to nearly −400° F. when liquid nitrogen is intermittently fed therethrough. The motor incorporates a stator sleeve and guide bearings wherein rubber elements thereof, which cause seizure of the motor due to swelling of the rubber against rotating structures therewithin caused by the high ambient temperature and by impregnation by the liquid nitrogen, are replaced with identically sized and configured elements made of a material having a suitable level of lubricity, which material does not interact chemically with or absorb the nitrogen, and the physical characteristics of which are only minimally affected, if at all, by the ambient temperatures, eliminating seizure of the motor under these conditions of use.