Suction Pump Or Fan Patents (Class 310/62)
  • Patent number: 5982064
    Abstract: The DC motor according to the present invention includes one radial ball bearing and a thrust bearing constituted by a shaft receiving member provided on a housing to be abutted by one end of a rotating shaft. Further, a magnetic and/or a spring bias force is applied to the rotating shaft to supplement thrust load bearing force of the thrust bearing. Compared with conventional DC motors in which a rotor is supported by a shaft through a pair of ball bearings which are axially spaced apart from each other, the present invention enables reduction of the overall motor height without harming the rotational stability while simultaneously achieving low production cost.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: November 9, 1999
    Assignee: Nidec Corporation
    Inventors: Fumihiro Umeda, Shuji Takahashi
  • Patent number: 5977668
    Abstract: A vehicle alternator is provided with a metal plate 133a to allow a resin fan 133 to be secured to an end surface of a polar core by welding. The metal plate may comprise an flat annular plate insertion molded into the resin fan, or disks disposed in a circle concentric to the resin fan, which is insertion molded into the resin fan an annular flange portion 343b which clamps the resin fan to the polar core and a cylindrical portion 343a may be provided, or a flange portion 443b and a cylindrical portion 443a may be provided. An annular flange portion 543b which clamps the resin fan to the polar core and a hollow cylindrical portion 543a and a flat annular plate portion 543d which extends radially inwards therefrom may be provided.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: November 2, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Nobuatsu Yoshioka
  • Patent number: 5929544
    Abstract: A drain structure for a fan motor prevents water from entering a discharge hole in the casing of the fan motor. A guiding passage is in opposed relation to the discharge hole and includes a front end portion covered by a fan boss section and an outer rib to prevent water from entering through the discharge hole into the casing. The guiding passage receives water discharged from the discharge hole. The discharge hole is formed in a lower portion of a casing cylindrical section. The casing cylindrical section is mounted on a fitting bracket for securement to a radiator.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: July 27, 1999
    Assignee: Mitsuba Corporation
    Inventors: Hirohiko Maekawa, Masaei Sato
  • Patent number: 5925947
    Abstract: An interior cooling air flow is moved by an interior fan through an inside ventilation passage provided on an inside surface of a stator frame of a totally-enclosed type motor. An exterior cooling air produced by an exterior fan is passed through an outside surface of ventilation passage provided on an outside the stator frame. An inner heat radiation rib is provided in the axial direction on an inner face the inside ventilation passage so that the temperature rise of the motor can be reduced by an improvement in the cooling characteristic. In this way, a compact size totally-enclosed type motor having an improved cooling characteristic is obtained.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: July 20, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Kenzo Kajiwara, Kouki Nagai, Kenji Takahashi, Heikichi Kuwahara
  • Patent number: 5923113
    Abstract: An arrangement for the transfer of electric current, a liquid medium and a gaseous medium between fixed and rotatable sections. A protective casing surrounds sliding brushes pressing against sliding surfaces. A passage for each medium is parallel with rotation and arranged at a boundary surface between the fixed and rotating sections. Passage transfer pipes in both sections communicate with the passages. A collector chamber arranged in the fixed section and an outlet pipe lead the gaseous medium out of the tubular rotating section. The arrangement for the transfer of a liquid medium is coaxially arranged inside the arrangement for the transfer of electric current. The protective casing provides a collector chamber for the gaseous medium.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: July 13, 1999
    Assignee: ABB Azipod Oy
    Inventors: Tommi Lassila, Timo Leppanen
  • Patent number: 5910694
    Abstract: An electronic component cooling apparatus capable of permitting a sufficient amount of air to be fed to an electronic component to be cooled. An impeller which includes a plurality of blades for sucking air from one side in an axial direction of a revolving shaft of a motor is fixed on a rotor of the motor. A casing having a cylindrical cavity defined therein in which the motor and impeller are received is constructed of a peripheral wall arranged so as to surround the impeller and a closing wall for closing an end of the cavity on the other side in the axial direction. The peripheral wall is formed at a portion thereof in proximity to an end thereof on the one side with a lateral discharge port through which air suckedly introduced into the cavity is discharged so that a surrounding portion for surrounding a whole circumference of the impeller is left at a portion of the peripheral wall in proximity to an end on the other side.
    Type: Grant
    Filed: September 17, 1998
    Date of Patent: June 8, 1999
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Shinjiro Yokozawa, Nobumasa Kodama, Toshiki Ogawara, Yuichi Kodaira, Michinori Watanabe
  • Patent number: 5905318
    Abstract: An electric motor comprises a flange at one end, the corner portions of the flange projecting over the outline of the stator. A ventilator is provided at the opposite end, having outlets which are in alignment with the corner portions. The ventilator does not project over the borderline of the flange.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: May 18, 1999
    Assignee: Frankl & Kirchner GmbH & Co. KG Fabrik fur Elektromotoren u. elektrische Apparate
    Inventors: Michael Faulhaber, Walter Ripplinger
  • Patent number: 5894178
    Abstract: In an air-cooled electrical machine having reverse cooling in a closed cooling circuit, a two-stage blade cascade for the optimum incident flow of cooling air to the rotor (4) and the rotor winding (29) is provided between a rotor cap plate (22) and a rotor shaft (28). The first blade cascade stage (30b) in the direction of flow is a deceleration cascade having essentially pressure-generating properties, and the following blade cascade stage (30a) in the direction of flow is a deceleration cascade having essentially deflecting properties. The flow cascade is provided radially on the inside with a sealing shroud band (32).
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: April 13, 1999
    Assignee: Asea Brown Boveri AG
    Inventor: Erno Stefan
  • Patent number: 5883449
    Abstract: Ceiling fan motors which include forced air ventilation and heat dissipation systems to provide significantly reduced motor operating temperatures, improved motor component tolerances, lower manufacturing costs, and ease of assembly. The ceiling fan motor is of the inside-out type and includes an impeller mechanism associated with at least one of the upper or lower portions of the motor casing for drawing substantial volumes of air into the casing, across the stator, and through the opposite portion of the motor casing. The motor casing components may be formed from cast aluminum. Alternatively, the entire casing and rotor is of unitary integrally cast aluminum. One of the end faces of the motor casing may include integrally cast blade ramps.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: March 16, 1999
    Assignee: Hunter Fan Company
    Inventors: Vinay Mehta, Scott P. Bojko, Richard A. Pearce, Marshall Sexton
  • Patent number: 5879141
    Abstract: An air fan capable of increasing the amount of air fed in a radial direction thereof. An impeller which includes a plurality of blades for sucking air from one side in an axial direction of a revolving shaft of a motor and guiding sucked air mainly toward the other side in the axial direction is mounted on a rotor of the motor. A casing includes a peripheral wall arranged so as to define a cavity therein in which the motor and impeller are received. A cavity is closed at each of both ends in the axial direction with a closing wall. The peripheral wall is provided at a portion thereof in proximity to an end thereof on the one side with a lateral suction port which permits air to be suckedly introduced therethrough into the cavity in a radial direction of the revolving shaft.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: March 9, 1999
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Shinjiro Yokozawa, Nobumasa Kodama, Toshiki Ogawara
  • Patent number: 5864190
    Abstract: This invention concerns a suction unit for hoods, ovens and similar appliances having a double auger casing consisting of two sectional half-shells, namely a top and a bottom shell which ensure easy assembly and automatic centring on a fan-motor unit entirely housed in the casing.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: January 26, 1999
    Assignee: F.I.M.E.--Fabrica Italiana Motori Elettrici S.R.L.
    Inventor: Alberto Bacchiocchi
  • Patent number: 5844333
    Abstract: An air cooler for an enclosed frame motor wherein two air-to-air heat exchangers are located in an enclosure mounted above an opening in the frame. The heat exchangers are disposed so that the heat exchanger coolant tubes extend transversely to the longitudinal axis of the motor drive shaft. The heat exchangers are positioned at opposed ends of the motor and inclined toward one another in an A-shaped configuration. The enclosure forms an enclosed region with the frame, isolating motor air inside the region from ambient air outside the region. An intake plenum is coupled with the enclosure on one side to direct ambient air into the interior of the heat exchanger coolant tubes at one end, whereby the ambient air exits from the tubes at the other end. Motor air surrounding the motor is heated during operation and circulated by an internal fan among the heat exchangers.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: December 1, 1998
    Assignee: Unifin International, Inc.
    Inventor: Geoffrey T. Sheerin
  • Patent number: 5838079
    Abstract: A synchronous type of linear motor using a permanent magnet comprising a primary magnetic pole member (a three-phase coil) and a secondary magnetic pole member (a permanent magnet) each for generating a repulsive force making use of mutual repulsion between a movable element and a fixed board.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: November 17, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nobutaka Morohashi, Susumu Kato
  • Patent number: 5831358
    Abstract: A rotor end cap for use with a rotor of a dynamoelectric machine to induce cooling air circulation, facilitate rotor balancing and enable rotor rotational position and speed sensing. The rotor end cap includes a base for attachment to a rotor of the dynamoelectric machine so that the base turns with the rotor. Further, the end cap includes a plurality of blades extending from the base in axial and radial directions with respect to the rotor for moving air to enhance cooling air circulation within the machine as the rotor turns. Still further, the end cap includes a balancing device extending from the base for altering a weight distribution around the base to balance the rotor. Yet still further, the end cap includes at least one shutter extending partially around the base for intermittently blocking passage of light as the rotor turns to enable rotational position and speed sensing of the rotor.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 3, 1998
    Assignee: General Electric Company
    Inventor: Dennis P. Bobay
  • Patent number: 5814908
    Abstract: An apparatus for providing ventilating air into a housing for an electric machine is disclosed. The apparatus includes a hub mounted to the housing with a raised center portion and a generally circular outer portion. The center portion is displaced upwardly from the outer portion to form an outer surface. The apparatus features a first plurality of main blades extending upwardly from the hub, a second plurality of auxilliary blades extending downwardly from the hub. Ventilating air is communicated through an axial aperture in the hub, the main blades guiding air at least partially into the central aperture and the auxilliary blades transmitting air through the housing. An apparatus including a blower wheel for providing ventilating air into a housing of an electric machine is also featured. The blower wheel features a generally dome-shaped hub. The blower wheel may feature a third plurality of impeller blades extending downwardly from the hub to transmit air into the housing.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: September 29, 1998
    Assignee: Siemens Electric Limited
    Inventor: Jerzy Muszynski
  • Patent number: 5797718
    Abstract: The invention relates to a fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises an impeller wheel (1) and a motor (4), which is a radial induction motor comprising an external stator (2) and an internal rotor (3), the stator (2) comprising a laminated core (2a) with coils (2b) arranged in slots, the rotor (3) comprising two concentric cylinders (3a, 3b), of which the outer cylinder (3b) is made of an electrically highly conductive material and the inner cylinder (3a) is made of a magnetically highly conductive material, one of the two axial end faces (3c) of at least one of the two rotor cylinders (3a, 3b) being in planar contact with the impeller wheel (1), the motor (4) being energised by means of a frequency changer (29 to 37) and the speed setting being derived from process-dependent nominal values and adjustable set-point values.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: August 25, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Dieter Gerling, Peter Lurkens
  • Patent number: 5780946
    Abstract: An air-cooled type electric motor (20) includes a rotor, a stator includes a stator core (28), and a front support member (32) and a rear support member (34) arranged at both axial ends of the stator core (28). A plurality of air passages (42), extending continuously in an axial direction, are provided in the stator core (28), the front support member (32), and the rear support member (34). A centrifugal blower unit (50) is placed at further rear side of the rear support member (34). Because the centrifugal blower unit (50) has a large pressure rise, air, surrounding the motor and sufficient to cause an effective cooling, can be made to flow into the air passages (42) with a smaller diameter. A drive section (56) of the blower unit (50) is fixed directly to the rear support member (34) by bolts (72). Consequently, an electric wire (74) for the drive section (56) extends through the interior space of the motor (20), and is connected to a terminal box (48).
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: July 14, 1998
    Assignee: Fanuc Ltd.
    Inventors: Kosei Nakamura, Yukio Katsuzawa, Yasuyuki Nakazawa
  • Patent number: 5777407
    Abstract: A rectifying unit is disposed axially adjacent to a rear cooling fan. The rectifying unit has a plus-pole heat dissipating fin and a minus-pole heat dissipating fin integrally connected by a terminal plate. The plus-pole heat dissipating fin has an elongation extending axially around the rear cooling fan to have direct cooling air from the fan. The minus-pole heat dissipating fin is fixed to the housing directly or via a heat conductive material to be electrically grounded. Slits are formed on the elongations of the plus-pole heat dissipating fin to have discharging cooling air therethrough. Further, elongations are formed on the both dissipating fins at their inner periphery proximate to an intake window of the housing. Thus, cooling capacity of the rectifying unit is enhanced.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: July 7, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hiroshi Ishida, Tooru Ooiwa
  • Patent number: 5763968
    Abstract: An alternator has front and rear cooling fans to effectively cool the stator windings and field coil of the alternator. The front cooling fan has a first number (e.g. six) of diagonal-flow type blades for cooling mainly the field coil and a second number (e.g. five) of centrifugal-flow-type blade for cooling the stator windings which are disposed between the diagonal-flow-type blades. The combination of the first and second numbers is designed to suppress noise level caused by the cooling fan.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: June 9, 1998
    Assignee: Denso Corporation
    Inventors: Yoshinori Hayashi, Hitoshi Irie
  • Patent number: 5763969
    Abstract: An integrated motor drive system includes a variable speed electric motor, a fan connected to the electric motor to generate an air flow as the motor rotates, and a motor drive connected to the electric motor, the drive including a heat sink disposed between the motor and the drive and having a plurality of asymmetrically spaced apart heat transfer fins transferring heat generated by power components in the drive to the air flow. The fan is connected to a one of either the rotor of the variable speed motor or to an auxiliary fan motor controlled independently of the variable speed motor. A fan shroud on one end of the motor acts as an air duct member adapted for dividing and directing the flow of air from the fan to sets of heat transfer fins on the heat sink. A method of operating the drive integrated type motor system includes generating motor speed command signals in the drive based on inputs from an operator through an operator interaface unit on the drive.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: June 9, 1998
    Assignee: Reliance Electric Industrial Company
    Inventors: Larry J. Metheny, Douglas H. Sudhoff, Anthony D. Thompson, Richard J. Budzynski
  • Patent number: 5757094
    Abstract: A method of improving the airflow through a low to medium speed salient pole dynamoelectric machine DEM is disclosed. The rotor rim on which the salient poles are mounted is shortened in comparison to prior art structures so that the ends of the salient poles (and the rotor windings) protrude a substantial distance beyond the edge of the rim. A stationary or rotating shield is placed in juxtaposed relationship with the rotating ends of the salient poles to provide an enclosure so that the protruding ends of the salient poles can function as a crude radial fan.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: May 26, 1998
    Assignee: General Electric Canada Inc.
    Inventor: Martin van Duyn
  • Patent number: 5757095
    Abstract: In a small starter motor which has a substantially closed space therein, it is necessary to blow out brush dust particles therefrom. On a coil end surface or both coil end surfaces of an armature, a fan generating an air circulation is formed utilizing gaps formed between individual coil ends on the surface without adding any other parts. Also, a side wall is disposed next to the coil end surface in parallel thereto which closes an axial end of a yoke in which the armature is coaxially disposed. In the space formed between the side wall and the coil end surface, an air circulation is generated when the armature rotates. The side wall has an air inlet hole and the yoke has an air outlet hole. Air coming into the space from the air inlet hole is blown out from the air outlet hole by the circulation generated by the fan made on the coil end surface. The brush dust particles are blown out by the circulated air, and the coil ends are cooled off at the same time.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: May 26, 1998
    Assignee: Denso Corporation
    Inventors: Masanori Ohmi, Tsutomu Shiga, Kenji Ogishima
  • Patent number: 5751079
    Abstract: An alternator for use with a motor vehicle including a housing. A separator plate is positioned within said housing to define front and rear air control volumes. A plurality of fans draw air through the respective front and rear air control volumes to cool the alternator during operation.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: May 12, 1998
    Assignee: Ford Motor Company
    Inventors: Bo Bagherpour, Ralph Kurt Hesse, Kenneth Ross Brooks
  • Patent number: 5751088
    Abstract: In an alternator, a brush holder holds a pair of brushes which abut slip rings perpendicularly. The brush holder is disposed within an inner periphery of a cooling fan so that the brush holder overlaps with the cooling fan in the axial direction by approximately a width of a brush. The brush holder is secured to the rear housing and disposed to face an air intake window. As a result, the axial length of the alternator is reduced without sacrificing cooling capacity for the brushes.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: May 12, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Takuzou Mukai, Hiroshi Ishida
  • Patent number: 5747900
    Abstract: An electric motor includes a covering member for covering the outer periphery of a stator core, to improve the cooling efficiency of an air-cooling system of the motor. The covering member is fixed to a stator while defining a cavity therebetween in fluidic communication with air passages formed directly in the stator core. When an blower unit mounted on the motor operates, an ambient air surrounding the motor is introduced into the cavity, and then flows from the cavity into the air passages, so as to actively absorb heat generated in the stator from the outer peripheral surface of the stator core and the tubular wall surfaces of the air passages. Thereafter, the air is discharged from the air passages out of the motor.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: May 5, 1998
    Assignee: Fanuc Ltd.
    Inventors: Kosei Nakamura, Yukio Katsuzawa, Junichi Nagai
  • Patent number: 5742107
    Abstract: A rotary fan includes a rotatable base plate, a plurality of fan blades mounted rotatably on the base plate at a peripheral portion thereof by means of supporting studs, and a blade angle adjusting mechanism mounted in association with each of the fan blades for allowing the fan blade to rotate pivotally about the supporting stud under a centrifugal force acting on the fan blade such that the rate of increase of the air quantity produced by the fan blade decreases as a rotation number of the rotatable base plate increases within a predetermined high-speed rotation range of the rotatable base plate, while in other rotation speed range outside of the high-speed rotation range, the blade angle adjusting mechanism acts to suppress the rotation of the fan blade around the supporting stud. Noise generated by the rotary fan can significantly be reduced while ensuring a sufficient quantity of air flow.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: April 21, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihito Asao, Katsumi Adachi
  • Patent number: 5734214
    Abstract: A molded through-flow motor assembly has a motor housing, including a cup portion and a flange portion. The flange portion includes a plurality of ramp surfaces extending outwardly therefrom. The cup portion has a field retaining wall and guide rib extending inwardly therefrom on opposite sides of the housing. A diffuser plate is provided having a plurality of scalloped ramp surfaces on a first side thereof adjacent to a plurality of air inlet apertures which open into air chambers on the second side thereof. The field and armature portions of a motor assembly are mounted in the motor housing and the diffuser plate is fitted to the flange portion of the housing such that the ramp surfaces abut one another to form a continuous ramp surface from each air inlet aperture into the air chambers. A rotating fan member is mounted to the armature shaft and is housed within a shroud cover fitted to the motor housing.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: March 31, 1998
    Assignee: Ametek, Inc.
    Inventors: Michael L. Gilliland, Robert A. Ciccarelli, Michael Coles
  • Patent number: 5719457
    Abstract: In a squirrel-cage rotor for an asynchronous machine, having a laminated core (2) which is mounted on the shaft (1), held together at both ends by press rings and is intended for accommodating the cage bars (3), the latter are respectively permanently connected to a short-circuiting ring (4) outside the laminated core (2). Each short-circuiting ring (4) is supported in the radial direction by a support ring (6) fixed on the shaft. In order to couple the cage head to the rotor body over the entire speed range of the machine for the purpose of suppressing natural vibrations, the two press rings are axially spaced from the laminated core (2) and simultaneously form the support ring (6) for the short-circuiting ring (4). In order to ensure the ventilation of the winding overhang, there are provided between the end face of the laminated core (2) and the support ring (6) spacer webs (7) which are preferably constructed in one piece with the support ring (6).
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: February 17, 1998
    Assignee: ABB Daimler-Benz Transportation (Schweiz) AG
    Inventor: Peter Helfer
  • Patent number: 5714810
    Abstract: A miniature motor comprising a housing formed into a bottomed hollow tubular shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor facing the permanent magnet and comprising an armature iron core having a coil wound thereon and a commutator, an end plate fitted to an open end of the housing and having brushes coming in sliding contact with the commutator and input terminals electrically connected to the brushes, and a cooling fan provided between the armature iron core of the rotor and the commutator; the rotor being rotatably supported by bearings provided on the bottom of the housing and the end plate, in which an integral cooling fan is formed by providing a plurality of fins at circumferentially equal intervals between first and second fan rings fitted to the ends of the commutator and the armature iron core, respectively, and a plurality of bosses are provided on the end face of the second fan ring.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: February 3, 1998
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Toshiya Yuhi, Minako Sakamaki
  • Patent number: 5714814
    Abstract: A support for the rotor shaft of a centrifugal pump with permanent-magnet electric motor. The motor is of the type which comprises a laminate-pack stator with a coil-like winding and a rotor placed in a cylindrical chamber which is separate from the stator, the rotor being rotatable about the shaft which is fixed axially therein. The support is characterized in that it comprises a tubular shank which extends from the bottom of the chamber and in which one end of the shaft is force-fitted. The bottom has a through hole at the shank.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: February 3, 1998
    Assignee: Askoll S.p.A.
    Inventor: Elio Marioni
  • Patent number: 5710467
    Abstract: Cooling wind is introduced into an electric-parts-chamber through openings formed at the bottom of a cover, then taken into the intake side of a cooling fan through the air intakes formed in the wall end of a housing from the electric-parts-chamber. The cooling wind is accelerated by the fan to be driven off from the outlets formed in the peripheral wall of the housing. The cylindrical portion of the positive side cooling fins of the rectifier is extended to the space between the outer periphery of the fan and the outlets. The inner diameter of the cylindrical portion is longer than that of the rear coil end. Thus, the coil end and the cylindrical portion of the positive side cooling fin are cooled sufficiently by the cooling wind blowing thereon at high speed, so that the rectifier can endure large thermal load with reduced wind noise even if the size of the alternator is small.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: January 20, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hitoshi Irie, Hiroshi Ishida, Shin Kusase
  • Patent number: 5705865
    Abstract: A rotary electric machine that controls fluid pressure and loss of cooling air, increases the cooling air flow rate, and is able to favorably cool the end of a coil with little regard to the positional relationship between the centrifugal blades and the end of the stator coil, is disclosed. A cooling fan of such a rotary electric machine includes centrifugal blades having deflecting blades disposed therebetween, which are mounted so as to incline towards an inside of the axial direction. The centrifugal blades and the deflecting blades are integrally formed. For this reason, the cooling air accelerates at areas between the individual blades in the centrifugal direction and is separated into two flows, one in the direction of inside portions and one in the direction of outside portions of the end of a stator coil. The end of the stator coil is cooled favorably.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: January 6, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hiroshi Ishida, Shin Kusase
  • Patent number: 5701045
    Abstract: An air fan capable of increasing the amount of air fed in a radial direction thereof. An impeller which includes a plurality of blades for sucking air from one side in an axial direction of a revolving shaft of a motor and guiding sucked air mainly toward the other side in the axial direction is mounted on a rotor of the motor. A casing includes a peripheral wall arranged so as to define a cavity therein in which the motor and impeller are received. The peripheral wall is provided at a portion thereof in proximity to an end thereof on the one side with a lateral suction port which permits air to be suckedly introduced therethrough into the cavity in a radial direction of the revolving shaft. Also, the peripheral wall of the casing is provided at a portion thereof in proximity to an end thereof on the other side with a lateral discharge port which permits air suckedly introduced into the cavity to be discharged therethrough in the radial direction.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: December 23, 1997
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Shinjiro Yokozawa, Nobumasa Kodama, Toshiki Ogawara
  • Patent number: 5663604
    Abstract: A brushless motor for use as a fan motor or the like has a housing, a bearing tower provided inside the housing, a stator fixed on a circumference of the bearing tower, a rotor having a shaft rotatably supported by a bearing inside the bearing tower, a rotor magnet provided on the rotor and opposed to the stator, and a circuit base on which a drive control circuit for controlling the rotation of the rotor by controlling a current supplied to the stator is formed. The housing is provided with a supporting plate for supporting the bearing tower. This supporting plate is recessed in an axial direction relative to a bottom surface of the housing, and supports the bearing tower so that the bearing tower projects inwardly from the supporting power in the axial direction. The circuit base is mounted on a surface of the supporting plate opposite from the bearing tower. If this structure is adopted, the overall size of the motor can be reduced while the desired mounting area of the circuit base is maintained.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: September 2, 1997
    Assignee: Nidec Corporation
    Inventor: Shuji Takahashi
  • Patent number: 5635779
    Abstract: In gas-cooled electrical machine with an axial fan (9) at one shaft end and with a rotor (1) and a stator body surrounded by a machine housing (14), a gas-guide device (18) arranged coaxially to the rotor shaft is provided in the outflow space (17) of the axial fan (9), out of which gas-guide device the cooling gas conveyed by the axial fan is fed to the rotor and to the stator body and stator winding. Said gas-guide device (18) comprises a plurality of guide rings (19-25) in the form of a cone envelope and spaced radially from one another and a ring part (27) likewise in the form of a cone envelope, which rings and ring part are connected to one another and to the machine housing (14) directly, or indirectly by means of bars (28, 29) extending essentially radially and/or guide plates (36, 36'). Ring-shaped channels (K.sub.1, . . . , K.sub.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: June 3, 1997
    Assignee: Asea Brown Boveri AG
    Inventors: Jurgen Baer, Hans Zimmermann
  • Patent number: 5632578
    Abstract: A router includes a motor housing having first and second clam shell halves forming an air inlet and a stator forming an air outlet, the housing having a central axis therethrough. An electric motor having a rotary armature, an armature shaft and a stationary member is fixed with respect to the housing. An axial fan is fixed to the armature shaft and positioned between the rotary armature and the stator for drawing air across the armature and stationary member. The fan has a plurality of radially extending fan blades tilted with respect to the central axis for forcing air in a substantially helical path. The stator includes a plurality of radially extending stator blades oppositely tilted with respect to the fan blades and the central axis for receiving air moving in a helical path from the fan blades. The stator blades are configured to cause air to swirl in a predictable manner when leaving the housing.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: May 27, 1997
    Assignee: Ryobi North America
    Inventors: Ronald C. McCurry, Paul W. Niemela
  • Patent number: 5608281
    Abstract: An axial flux induction motor has a stator and a disc-shaped rotor facing the stator with an air gap there-between. The rotor disc includes a first material of relatively high magnetic permeability and a second material of relatively high electrical conductivity, the first material being of higher specific gravity than the second material. The first material is in the form of an annular ring imbedded in or supported on one surface of the disc, opposite the surface thereof which faces the stator. The outer radius R.sub.1 of the annular ring and the outer radius R.sub.2 of the disc are related so that 1.2 R.sub.1 <R.sub.2 <1.6 R.sub.1. This achieves that at high rotational speeds the two disc materials will be subjected to more nearly equal centrifugal forces thereby making it feasible to operate at higher motor speeds.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: March 4, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Dieter Gerling, Peter Lurkens
  • Patent number: 5594288
    Abstract: A laminated rotor assembly is provided having a plurality of laminates, each of which has integral rotor blades. The rotor blades are angled at a predetermined amount with respect to a hub portion of the rotor assembly. The laminates are joined such that the laminated rotor assembly is closed.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: January 14, 1997
    Assignee: Daniel Industries, Inc.
    Inventor: Zaki D. Husain
  • Patent number: 5574321
    Abstract: A dynamoelectric machine in the preferred form of a permanent magnet motor has an integral blade assembly associated with the rotor for the motor. The motor includes an enclosure with which the blade assembly mates. The blade structure/housing combination provides a labyrinth moving seal to protect the motor and associated motor control. The blade assembly and enclosure preferably are constructed from nonconductive material and provide a fully electrically insulated motor-fan assembly, which eliminates the need for certain grounding requirements. Blade construction is optimized easily to reduce audible sound in operation use. A method of assembly for a motor provides an integral blade assembly housing arrangement.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: November 12, 1996
    Assignee: Emerson Electric Co.
    Inventor: Gerald N. Baker
  • Patent number: 5563461
    Abstract: A baffle and lead guide is provided for an electric motor with a reverse air flow cooling system for the motor. The motor includes a shell housing a stator assembly and a rotor assembly, the rotor assembly including an axially extending shaft. A first end shield closes one end of the shell and a second end shield closes the second end. The shaft is rotatably journaled in at least one of the first and second end shields and extends through at least one of the first and second end shields. A fan is fixed to the shaft between the rotor and the second end shield to rotate with said shaft. Leads extend to the second end shield through the motor shell from the stator assembly. The baffle is positioned axially adjacent the fan. Preferably, the baffle is annular in shape and includes at least one axially extending leg which defines a lead chute radially outboard of the fan to guide the lead wires past the fan.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: October 8, 1996
    Assignee: Emerson Electric Co.
    Inventor: Nicholas R. Daniels
  • Patent number: 5561334
    Abstract: A rotary electric machine that controls fluid pressure and loss of cooling air, increases the cooling air flow rate, and is able to favorably cool the end of a coil with little regard to the positional relationship between the centrifugal blades and the end of the stator coil, is disclosed. A cooling fan of such a rotary electric machine includes centrifugal blades having deflecting blades disposed therebetween, which are mounted so as to incline towards an inside of the axial direction. The centrifugal blades and the deflecting blades are integrally formed. For this reason, the cooling air accelerates at areas between the individual blades in the centrifugal direction and is separated into two flows, one in the direction of inside portions and one in the direction of outside portions of the end of a stator coil. The end of the stator coil is cooled favorably.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: October 1, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hiroshi Ishida, Shin Kusase
  • Patent number: 5559380
    Abstract: An air-cooled motor having cooling-air passages each formed by a plurality of small ventilation passages extending through a front housing, a stator, and a rear housing, constructed in one piece. Cuttings are prevented from being accumulated at inlets of cooling-air passages. For example, the cooling-air passages are formed of ten small ventilation passages, each defined between adjacent ones of eleven ribs each forming part of the stator. All the eleven ribs are provided with respective front housing ribs. End faces of the front housing ribs on the cooling-air inlet side are uniform in height, and positioned in an identical plane. Cooling air flows into the small ventilation passages in the direction of an arrow.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: September 24, 1996
    Assignee: Fanuc Ltd.
    Inventors: Kosei Nakamura, Yukio Katsuzawa, Yoshinobu Maeda
  • Patent number: 5539263
    Abstract: A direct current fan has a base, a stator assembly fixed to the base, a spindle extending from said the stator assembly, and a blade assembly rotatably mounted to the spindle. The stator assembly includes a central axle and a bobbin having electrically conductive winding formed over the central axle. Pole plates alternately extend from diametrically opposed upper and lower disks which are mounted to the respective upper and lower ends of the central axle. Each said pole plate has first and second circumferential sections located at different distances from the central axis. The blade assembly includes a cylindrical member having blades mounted thereto and a circular central recessed portion. A hub is formed in the center of the recessed portion for receiving a portion of the spindle. The hub has an aperture in its center and a plurality of tabs equally spaced around the aperture.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: July 23, 1996
    Inventor: Tzu-I Lee
  • Patent number: 5492458
    Abstract: An electric fan includes a housing having a hub formed in the center, a shaft has one end force-fitted in the hub and having an annular flange formed in the other end, two polar plate are force-fitted on the shaft, and a stator is disposed between the polar plates. The upper polar plate and the lower polar plate each includes a hole for engaging with the shaft and the holes have one or more teeth for solidly engaging with the shaft.
    Type: Grant
    Filed: January 6, 1995
    Date of Patent: February 20, 1996
    Inventor: Alex Horng
  • Patent number: 5394040
    Abstract: A heat dissipator for an electric motor includes an impeller having an internal heat transfer mechanism. The heat transfer mechanism provides efficient heat transfer from the motor armature to the surrounding environment without forcing cooling fluids into the motor and without transferring heat through the motor housing. The motor can therefore be encased in sealed, light-weight plastic motor housing having relatively poor heat transfer characteristics without danger of overheating. The impeller is preferably designed to displace fluids without turbulence, thereby reducing noise and increasing efficiency. To this end, the impeller employs annular disks stacked on a shaft which may be rotatably mounted in a specially shaped housing and which preferably is formed from an extension of the motor drive shaft. The disks and a complementary surface cooperate so as to use a combination of surface friction, centrifugal forces, and a venturi effect to propel fluids without turbulence.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: February 28, 1995
    Assignee: Heat Pipe Technology, Inc.
    Inventor: Dinh Khanh
  • Patent number: 5394041
    Abstract: An electronically commutated motor for dust exhausters with a stator with excitation windings and with a rotor positioned to rotate in an air gap. The rotor has bundled laminations and permanent magnets around its circumference corresponding to the number of poles of the stator. A fan rotor of a ventilator is also provided on the rotor shaft, with the fan rotor connected downstream from the motor in the intake direction of the cooling air. The rotor shaft is connected with a turbine for generation of an intake air current, wherein the fan rotor is positioned in the upper bearing plate of the turbine. The bearing plate is designed in one piece in immediate vicinity of the turbine rotor and has indentations and cutouts in a radially outward direction, whereby air currents of the fan rotor and the turbine rotor flow each from its respective side, with the exit slots for cooling air from the fan rotor and the outlets for the exhaust from the turbine going out from the bearing plate.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: February 28, 1995
    Assignee: WAP Reinigungssysteme GmbH & Co.
    Inventor: Rainer Oberdorfer-Bogel
  • Patent number: 5355042
    Abstract: A rotating machine having a rotor comprising a flexible shaft with a plurality of masses distributed along the shaft. Included within these masses are magnetic disks. Magnetic bearings are attached to the housing and coact to support the rotor in only a radial direction or in both radial and axial directions. Bearing sensors are used to measure the shaft position local to each bearing relative to a face of each bearing. Variable magnetic bearing parameters are controlled so as to change values of stiffness and damping of the magnetic bearings in response to the measurements from the bearing sensors. These controls can be direct analog circuitry, or digital components, or a combination of digital and analog components.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: October 11, 1994
    Assignee: University of Virginia Patent Foundation
    Inventors: David W. Lewis, Robert R. Humphris, Eric H. Maslen, Paul E. Allaire, Ronald D. Williams
  • Patent number: 5351606
    Abstract: This invention relates to a bread baking device, and is intended to attain the objective of providing a bread baking device having no exclusive cooling fan as an extra special part, and enabling low-cost production, by integrally shaping a cooling fan in one piece with a driving pulley mounted on the driving shaft of a driving motor, and by efficiently cooling the generated heat in said driving motor and the frictional heat generated in a belt by circulating air flow in accordance with the revolution of said driving motor.
    Type: Grant
    Filed: July 27, 1993
    Date of Patent: October 4, 1994
    Assignee: Funai Electric Co., Ltd.
    Inventor: Yoshiaki Matsuzaki
  • Patent number: 5345132
    Abstract: An object of the invention is to, in a vehicular alternating current (AC) dynamo, reduce an influence of vibration on a brush during operation, thereby preventing the brush from wobbling, cracking or causing other damages, also to make the brush sufficiently exposed to cooling air during operation, thereby preventing the brush temperature from rising excessively. In the vehicular AC dynamo, by virtue of a pressing force produced upon a tubular cover integral with a fan guide being fixed to a rear bracket through a seal member, an abutting end surface of a projection of the tubular cover is axially abutted with an inner abutting surface of a recess of the brush holder for pressing and fixing said brush holder against and to the rear bracket.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: September 6, 1994
    Assignees: Hitachi Automotive Engineering, Hitachi, Ltd. and Co., Ltd.
    Inventors: Susumu Sasaki, Hisashi Wada, Takashi Oguri, Susumu Terumoto, Akihiro Saito
  • Patent number: 5343101
    Abstract: A one-piece, plastic, integrally formed deflector for a motor includes a generally annularly shaped shroud portion, an axially offset generally annularly shaped mounting ring portion, and four generally axially extending webs interconnecting them. The deflector may be conveniently mounted to an end bracket with a screw placed through a mounting hole in the mounting ring located at each web such that as the end bracket is assembled to the motor, the shroud portion closely fits nearly adjacent the rotating rotor blades and the inside of the motor shell to restrict the flow of ventilating air through the motor and prevent its re-circulation past the blades.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: August 30, 1994
    Assignee: MagneTek Century Electric, Inc.
    Inventor: Madhavsinh A. Matani