Abstract: The present invention provides a turbo molecular pump capable of suppressing temperature rise in an electronic circuit section within a range, without losing airtight property thereof with a simple construction. In a base section of a turbo molecular pump, a bottom portion thereof is sealed by a bottom cover. A semiconductor device is disposed at the inner portion of the bottom cover. A cooling member is provided, which is used for releasing heat of the semiconductor device in an airtight state outside the bottom cover.

Abstract: A motor and fan structure 10 includes direct current motor assembly 18 having a stator assembly 20 including a flux plate 22 and permanent magnet structure 24 mounted on the flux plate 22. The flux plate 22 defines one end of the motor assembly and define a magnetic flux path of the motor assembly. The motor assembly also includes a generally cylindrical armature assembly 32 defining another end of the motor assembly. The armature assembly is radially wound with windings 40, and an outermost part of the armature assembly and at least a portion of the windings is exposed to the environment. The structure includes a fan 12 having a generally cylindrical hub 14 receiving and covering the outermost part and the portion of the windings of the armature assembly. The hub 14 has a plurality of blades 16 extending therefrom. Thus, the weight and axial length of the motor assembly can be reduced since no case is required to cover the armature assembly yet the armature assembly is protected by the fan hub.

Abstract: There is provided a vacuum pump which suppresses the propagation of vibrations to an external container without the use of a damper. The vacuum pump has an outer cylindrical portion, a rotor portion and a stator portion accommodated within the outer cylindrical portion to define a transferring portion for a gas sucked from an inlet port, a magnetic bearing for supporting the rotor portion with respect to the stator portion, a motor for rotating the rotor portion with respect to the stator portion, and a base for supporting the outer cylindrical portion and the stator portion. A vibration absorbing member is interposed between the stator portion and the base, which has a natural frequency F=(f1+f3)/2±(f1−f3)/4, provided that f1, f2 and f3 respectively denote a natural frequency of nutation in conical mode, a natural frequency in parallel mode and a natural frequency of procession in the conical mode, when the rotor portion is rotated at a rated speed.

Abstract: A rotor (10) is provided for a dynamoelectric machine. The rotor (10) includes a rotor shaft (12) and a laminated core (14). The rotor shaft (12) is adapted to mount the rotor (10) for rotation about an axis (13) of rotation in a dynamoelectric machine. The laminated core (14) includes a shaft receiving opening (42) extending along the axis (13). The opening (42) is defined by a plurality of helical lands (44) separated by a plurality of helical grooves (46), with both the lands (44) and the grooves (46) extending along the shaft (12). The lands (44) are engaged with a shaft (12) to mount the core (14) to the shaft (12) for rotation therewith about the axis (13). The grooves (46) are equally angularly spaced about the axis (13) and extend radially outward from the lands (44) and the shaft (12), whereby rotation of the shaft (12) pumps coolant through the grooves (46) to cool the rotor (10).

Abstract: A gas premix burner in which gas and air are mixed in a suction region of an impeller to form a combustion mixture. The impeller is associated with a blower housing and an electronic control circuit board, all of which are arranged upstream in a blower chamber having at least one flame separating wall. The arrangement prevents the gas and the combustion mixture from reaching the motor landings or the printed circuit board.

Abstract: A bearing holder capable of holding therein a pair of bearings while keeping axes of the bearings to be positively aligned with each other and minimizing stress applied to the bearings. The bearing holder which is made of plastic resin and in which the bearings are held is mounted on a housing made of plastic resin. The bearing holder includes a hollow cylindrical holder body which is provided on an inner surface thereof with a plurality of projections inwardly projected therefrom so as to be contacted with an outer periphery of each of the bearings. The projections each are formed so as to continuously extend in a longitudinal direction of the holder body. The holder body is formed at each of both ends thereof with a plurality of slits each extending along each of both sides of each of the slits.

Abstract: A combination motor and pump assembly comprising a housing, a shaft rotaty mounted in the housing, and an impeller fixed to the shaft in the housing, said impeller comprising alternately magnetically polarized portions. The assembly further comprises stator means fixed in the housing adjacent the impeller, the stator means comprising an array of pole pieces and windings associated therewith for receiving electrical alternating current. Fluid inlet means and outlet means are provided in the housing in communication with the impeller. The impeller reacts to current received by the stator means as a motor rotor and rotates in response to excitation of the pole pieces by the current. The rotation of the rotor serves to move fluid in the housing from the inlet to the outlet means.

Abstract: A unit for delivering fuel from a supply tank to the internal combustion engine of a motor vehicle in which an electrical drive motor, which is embodied as an axial field motor, drives an impeller of a feed pump, which is embodied as a peripheral feed pump. In order to embody the delivery unit as flat as possible in the axial direction of the impeller, the rotor part of the axial field motor is disposed on the impeller, which carries the blades and which revolves in a pump chamber, and is combined with this impeller into one common element. The rotor windings of the rotor part can be disposed either inside a circle constituted by the blades of the feed pump or on the impeller radially outside the blades; the permanent magnets of the axial field motor are accordingly disposed in the housing, opposite the rotor windings.

Abstract: A magnet pump in which an impeller having a permanent magnet embedded therein is rotatably driven by a magnetic force from the outside of the impeller is disclosed. The pump comprises a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained. The impeller is rotatably contained in the pumping chamber of the casing and has the permanent magnet embedded therein. A pair of bearings, one being fixed to the casing and the other being fixed to the impeller is provided. A magnetic force driving mechanism constitutes a means for affording the magnetic force on the permanent magnet within the impeller to rotatably drive the latter. The magnetic force driving mechanism is mounted on a non-liquid-contacting portion of the casing at a position facing the impeller in respect to the direction of the rotary shaft axis of the impeller.

Abstract: An axial flow fan for ventilating electrical and electronic equipment includes a brushless, DC external rotor-type central drive motor. The stator is supported by a bearing tube formed of plastic, integrally molded with a mounting flange. In one embodiment, the fan casing forms part of the integral plastic molding.

Abstract: A rolling rotor motor/compressor is provided with an external rotor/piston which coacts with a bore/cylinder in the housing and one or more vanes to define a rolling piston compressor. Thus, the stator does not form a part of the compression chamber. The compressor can be readily designed for two cylinder or two stage operation.

Abstract: A rolling rotor motor/compressor is provided with counterweights for mechanical balancing while permitting radial movement of the rotor/piston. This permits unloading of the compressor such as when there is a liquid slug. The rotor/piston and the counterweights are driven by diametrically opposed windings so that the rotor/piston does not drive the counterweights with attendant power/capacity reductions.

Abstract: A rolling rotor motor/compressor is made with a stator and both an inner and an outer rotor which serve to mechanically balance the device. The device can be configured to be a single compressor, two compressors, staged compressors as well as functioning as a motor. In the preferred embodiment the rotors are restricted to an orbiting movement.

Abstract: A light-weighted, inexpensive axial-flow fan apparatus which can prevent axial leakage of a magnetic flux of a brushless motor installed therein. A body member of the apparatus or a motor casing on which the motor is supported is made of a non-magnetic material such as a resin material, and a name plate formed from a magnetic seal is applied to the bottom of the motor casing so as to pass a magnetic flux therethrough.

Abstract: A pump including an impeller having a magnet or a second conductor therein, the impeller being adapted to be directly rotated by virtue of magnetic fields of stator coils. The impeller is rotated within a casing in close proximity thereto via ceramic bearing members, one bearing member having spiral grooves on its slide surface. The ceramic bearing members constitute a dynamic pressure bearing means.

Abstract: A turbomolecular pump is disclosed which has reduced axial length so as to provide a small-sized pump, and which also has improved stability during high-speed operation, is simple in construction, and is able to operate at much higher speeds than prior art devices.

Abstract: A rotary machine having two meshing rotors (14,15) rotatable in intersecting bores (12,13). The bore walls are provided with a number of electrical windings (18,19) being stator windings of an electric motor in which the pump rotors (14,15) are the rotors of the electric motor. The electrical windings are connected to an inverter which creates rotating magnetic fields which rotate the rotors.

Abstract: A positive displacement device capable of performing the typical positive displacement device functions such as pump, generator, flow meter, etc. is presented. The device comprises a housing having interior surfaces defining an inlet and an outlet separated by two generally circular cylindrical fluid flow chambers. A fulcrum is near the center of the device. A positive displacement barrier separates the inlet from the outlet. The barrier which is the only moving part comprises two circular cylindrical pistons coupled by a generally planar plenum barrier. The plenum barrier slides back and forth and teeter totters on a fulcrum so that each piston is always sealing the inlet from the outlet along the inside of its associated cylinder while each piston orbits its cylinder in a different direction. Fluid is caused to move around the piston by the piston and its sealing point.

Abstract: Inside the sealing shroud of the centrifugal pump there is located an inner rotor driven by a drive motor, while an outer rotor which is connected to the pump impeller is located outside of the sealing shroud wall. At least the sealing shroud wall is formed of a material which is electrically non-conductive. The efficiency is improved. Materials not normally used in sealing shrouds, such as ceramics, can be used for the same and this increases the usefulness or fields of application of the pump.

Abstract: A fluid pump including a double-entry impeller whose outer boundary is defined by a dissected spherical surface. The spherical surface includes an equatorial region which may be a groove or a cylindrical surface. The impeller is polarized magnetically and forms a dipole whose axis is normal to the plane of the equatorial region. The rotating magnetic field of a polyphase stator winding spins the impeller, and aligns the impeller spin axis along the stator axis.

Abstract: As a drive source of a blowing fan for a vehicular radiator, there is used a flattened electric motor, wherein there is fixed to one of two divided housings a shaft, on which there is rotatably supported a rotor to which a flattened armature coil is joined and to which the blowing fan is fixed through a radiating member. Thus, the heat, which is generated in the armature coil, is transferred through the rotor and/or the shaft to the radiating member, by which it is efficiently radiated into the air.

Abstract: A flat type fan is provided having an axial dimension very much less than its radial dimension, comprising a casing forming a cylindrical duct for a fan blade unit.Two webs carry bosses having fixing bores therethrough. The length of the bosses is equal to the length of the casing, which allows the fan to be fixed on a wall by any one of its faces, for blowing or for suction.

Abstract: An AC generator for vehicles has a cooling fan secured to one end face of a rotor core, being operative to produce radial and axial flows of cooling air. The radial air flow passes across a stator coil and outwardly through air outlet openings formed in a peripheral wall portion of a housing. The axial air flow passes through spaces between respective fingers of rotor core and also through air gap between the rotor and stator, so that the rotor and stator coils are reliably cooled by the cooling fan. In an embodiment of the invention, an additional radial-flow fan is provided and mounted on the rotor in face-to-face contacting relationship with the other end face of the rotor core.

Abstract: An AC generator for vehicles has a cooling fan secured to one end face of a rotor core and being operative to produce radial and axial flows of cooling air. The radial air flow passes across a stator coil and outwardly through air outlet openings formed in a peripheral wall portion of a housing. The axial air flow passes through spaces between respective fingers of rotor core and also through air gap between the rotor and stator whereby the rotor and stator coils are reliably cooled by the cooling fan. In an embodiment of the invention, an additional radial-flow fan is provided and mounted on the rotor in face-to-face contacting relationship with the other end face of the rotor core.

Abstract: An apparatus (10) for cooling a ceiling mounted room fan motor (11) having a rotatable shaft (24) and a motor housing (12) includes a flywheel (13) supported upon and rotating with the shaft (24) and a fan assembly (14). Motor housing (12) has a cylindrical side (15) and substantially circular end plates (18, 19) which together completely seal all windings of fan motor (11) therewithin and preclude entry of and contamination by environmental particulate pollutants. Fan assembly (14), similar to that of a squirrel cage fan, is substantially cylindrical, surrounds motor housing (12), and is operatively connected with flywheel (13) to rotate with the shaft (24), all energy for operation of fan assembly (14) being provided by fan motor (11).

Abstract: The fan rotor has an axial passage for a stationary shaft, one end of which is secured to the housing. The other end is covered by a plug for sealing-off the axial passage near the impeller hub. An external cover-plate of heat-conducting material is placed over the plug and applied in good thermal contact with the annular end portion of the rotor which is associated with the impeller.

Abstract: An electromagnetically driven pump having a rotor unit comprising a motor armature integral with a pump impeller and supporting bearing means mounting the rotor unit for rotation and limiting axial movement of the rotor unit in one axial direction and additional means for limiting movement of the rotor unit in an opposite axial direction.

Abstract: A pump, particularly a turbo vacuum pump, comprises a housing having an intake and an exhaust spaced from the intake. The respective ends of the housing are provided with bearing bushes which extend in respective opposite directions and support a pump rotor in a manner to permit it to have some axial and radial play. A first magnetic system acts on the rotor and stabilizes the rotor axially in respect to the bearings and a second magnetic system acts on the rotor and stabilizes the rotor radially in respect to the bearings. The second magnetic system includes at least one permanent magnet which is fixed to the casing and faces either soft iron or permanent magnet portions provided on the rotor. An electromotor is mounted within the casing and the coil of the electrodynamic system and the stator of the drive motor are assembled to a subassembly which can be mounted or dismounted from the pump casing in a simple manner without interfering with the rotor or the stator.

Abstract: A ventilating unit has separate passages connecting internal and external environments, and a reversible heat pump with evaporator in one passage and condenser in the other passage. Separate reversible axial flow fans are located in the two passages. Two ventilating modes are provided, in each of which the fans are moving air in opposite directions through the passages. When the internal environment is relatively warm, the incoming air passes over the evaporator and the outgoing air over the condenser, and vice versa when the internal environment is relatively cool. Special fan design facilitates direction reversal, and also variable speed operation. The unit also has an additional inlet with a heater, and control means are adapted to provide a recirculation mode in which the recirculated air is heated thereby.