With An Adhesive Patents (Class 310/156.21)
-
Patent number: 8772993Abstract: An electric motor (20) has a stator (30) and a rotor (26). The latter is equipped with a cup-like rotor part (56) and with a ring magnet (60) adhesively bonded therein, which magnet has an outer circumference (61) on which are provided elevations (84) and depressions (86) that extend at least partly in the longitudinal direction of the ring magnet (60). The outer circumference (61) of the ring magnet (60), that faces toward the cup-like rotor part (56) after assembly, is formed with at least one opening or channel (68; 69, 88), extending in a circumferential direction, that is connected to at least a plurality of the flat depressions (86). Positive mechanical engagement between adhesive and ring magnet enhances durability, and discourages any tendency toward relative rotation between the magnet (60) and the cup-like rotor part (56).Type: GrantFiled: July 21, 2008Date of Patent: July 8, 2014Assignee: EBM-Papst St. Georgen GmbH & Co. KGInventors: Rainer Strohm, Tobias Maier, Volker Hildebrand, Juergen Pfaff, Arno Karwath
-
Publication number: 20140184007Abstract: A rotor that includes a rotor core assembly secured to a shaft. The rotor core assembly includes a magnet and an end cap secured to an end of the magnet. Each of the magnet and the end cap has a bore into which the shaft extends. The end cap forms an interference fit with the shaft. The magnet forms a clearance fit with the shaft and an adhesive is located in the clearance between the magnet and the shaft. Additionally, a method of manufacturing the rotor. The method includes inserting the shaft into the bore of the end cap. An adhesive is then introduced into the bore of the magnet and the shaft is inserted into the bore of the magnet so as to cause adhesive to be drawn into the clearance defined between the magnet and the shaft.Type: ApplicationFiled: March 5, 2014Publication date: July 3, 2014Applicant: Dyson Technology LimitedInventors: David IONS, David Michael JONES
-
Publication number: 20140167532Abstract: A rotor of a motor capable of improving durability of the motor by increasing a bonding force between a ring magnet and a resin. The rotor includes a ring magnet having an insertion hole passing through the center thereof, a shaft inserted into the insertion hole, and a resin that is disposed between the insertion hole and the shaft and fixes the ring magnet and the shaft. The resin extends to upper and lower surfaces of the ring magnet so as to cover at least parts of the upper and lower surfaces of the ring magnet.Type: ApplicationFiled: December 16, 2013Publication date: June 19, 2014Inventors: Young Il PARK, Dong Ju SHIN
-
Patent number: 8702898Abstract: A method for connecting a first joining partner to a second joining partner. After provision of the first joining partner and the second joining partner, a lacquer layer is applied to the first joining partner. Then the first joining partner and the second joining partner are saturated together with an impregnating resin. The lacquer layer is produced from a lacquer composition based on an epoxy resin mixture, a curing accelerator, a silane-based, epoxy-functional bonding agent, and a solvent. The epoxy resin mixture has 10 wt.-% to 94 wt.-% of at least one solid epoxy resin with a maximum epoxy count of 2 Eq/kg, 1 wt.-% to 50 wt.-% of at least one solid, multifunctional epoxy resin with an epoxy count >4 Eq/kg, and 5 wt.-% to 40 wt.-% of a phenol and/or kresol novolak with a melting point >30° C. After impregnation, the viscosity of the impregnating resin is reduced such that the first joining partner and the second joining partner are connected to one another.Type: GrantFiled: June 1, 2007Date of Patent: April 22, 2014Assignee: Vacuumschmeize GmgH & Co. KGInventor: Lothar Zapf
-
Publication number: 20140077652Abstract: Provided is a rotor for a rotating electrical machine which is capable of minimizing increases in eddy current losses via a magnet, while making insulating film processing of the surface of the magnet unnecessary. The rotor for the rotating electrical machine includes: a rotor core having a magnet insertion hole extending inside; a magnet inserted in the magnet insertion hole; and an insulating filler which is filled between the inner wall of the magnet insertion hole and the magnet so as to secure the magnet. The magnet is secured by the filler in such a manner that the surface of the magnet inside the magnet insertion hole is in an inclined position with respect to the extending direction of the inner wall of the magnet insertion hole.Type: ApplicationFiled: June 9, 2011Publication date: March 20, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshitada Yamagishi, Yuta Watanabe
-
Publication number: 20140077651Abstract: A permanent magnet rotor arrangement includes a rotor and a plurality of nonmagnetic, axially extending profiled tubes defining a closed channel and affixed circumferentially along the outer rim of the rotor. A plurality of permanent magnet pole pieces are arranged in the channels. A single pole piece is arranged in each channel. The cross-sectional profile of the pole piece does not correspond to the cross-sectional profile of the channel.Type: ApplicationFiled: November 19, 2013Publication date: March 20, 2014Inventor: Henrik Stiesdal
-
PERMANENT MAGNET ELECTRIC MACHINE HAVING MAGNETS PROVIDED WITH A THERMAL ENHANCEMENT BONDING COATING
Publication number: 20140070654Abstract: A rotor assembly for a permanent magnet electric machine includes a plurality of rotor laminations joined to form a rotor body. Each of the plurality of rotor laminations includes a plurality of slots. One or more permanent magnets are mounted within respective ones of the plurality of slots. Each of the one or more permanent magnets includes a thermal enhancement bonding coating. A method of forming a rotor assembly is also disclosed.Type: ApplicationFiled: September 10, 2012Publication date: March 13, 2014Applicant: REMY TECHNOLOGIES, L.L.C.Inventors: Colin Hamer, Koon Hoong Wan -
Publication number: 20140042857Abstract: A rotor of a permanently excited synchronous machine includes a shaft capable of rotating about an axis and a laminated core having an axial layering arrangement defined by planes which are aligned perpendicular to the axis. The laminated core has at least two layers of different geometry. A first layer has a plate with a closed outer contour at least at an outer periphery, and a second layer has plural plate segments. The first and second layers of the laminated core are arranged in an axial direction to form axial pockets in interspaces between the plate segments of the second layer and recesses formed radially within the outer contour of the first layer for receiving permanent magnets. An adhesive is provided in radial gaps formed at least in axial sections of the second layer between adjacent plate segments and the permanent magnets.Type: ApplicationFiled: August 8, 2013Publication date: February 13, 2014Applicant: Siemens AktiengesellschaftInventors: Daniel Mader, Rolf Vollmer
-
Publication number: 20140042856Abstract: A permanent magnet type motor of high quality is achieved which is capable of lowering the manufacturing irregularity of the rotor. Provided is a method for manufacturing a permanent magnet type motor in which a permanent magnet is incorporated into a rotor cores stack, the method including a process of forming the rotor core stack, by combining a plurality of core sheets having a magnet insertion hole with a core sheet not having the magnet insertion hole, and disposing the core sheet not having the magnet insertion hole in one end of a stacking direction; a process of injecting a low-viscosity adhesive into the magnet insertion hole in which one end is blocked by the core sheets; and a process of bonding and fixing the permanent magnet by inserting the permanent magnet into the magnet insertion hole into which the low-viscosity adhesive is injected.Type: ApplicationFiled: July 22, 2013Publication date: February 13, 2014Applicant: SANYO DENKI CO., LTD.Inventors: Toshihito Miyashita, Manabu Horiuchi
-
Patent number: 8648511Abstract: A magnetic component part for a rotor assembly of an electromechanical transducer is provided. The magnetic component part includes a base element having a first side and an opposing second side, a permanent magnet, attached to the base element at the first side, and a mounting structure fixed to the base element at the second side and adapted to be mechanically connected to a support structure of the rotor assembly. The permanent magnet is located in an offset position with respect to a central axis of the mounting structure, which central axis extends from the mounting structure through the second side to the first side. A rotor assembly, an electromechanical transducer and a wind turbine, which are all equipped with at least four magnetic component parts are also provided as well as a method for manufacturing a rotor assembly including at least four magnetic component parts.Type: GrantFiled: January 20, 2011Date of Patent: February 11, 2014Assignee: Siemens AktiengesellschaftInventors: James Kenneth Booth, Soeren Gundtoft
-
Patent number: 8629595Abstract: A permanent magnet rotor arrangement is provided. The arrangement includes a rotor, a plurality of nonmagnetic profiled tubes defining a closed channel and affixed circumferentially along the outer rim of the rotor, and a plurality of permanent magnet pole pieces arranged in the channels. In a preferred embodiment, the tubes are monolithic and one pole piece is arranged in every channel.Type: GrantFiled: July 12, 2011Date of Patent: January 14, 2014Assignee: Siemens AktiengesellschaftInventor: Henrik Stiesdal
-
Publication number: 20140009017Abstract: A motor is disclosed, the motor including a housing, a stator mounted on the housing, and including a stator core having a plurality of teeth, an insulator and a coil, a rotor core rotatatively disposed at a center of the stator and centrally having a space unit, and a magnet module mounted on a surface of the rotor core, wherein the magnet module includes a plurality of magnets each having a predetermined size, and a guide plate having an embossed unit accommodated by the plurality of magnets and attached to an inner surface of the magnet.Type: ApplicationFiled: July 3, 2013Publication date: January 9, 2014Inventor: Jinho KIM
-
Publication number: 20130328433Abstract: A method of manufacturing a bonded-magnet rotor according to the invention includes forming step and arranging step. The forming step is by forming a bonded-magnet formed body. The arranging step includes: integrating an inside-diameter holding jig, a rotor core, and a rotor-core presser jig; arranging the bonded-magnet formed bodies on the outside periphery of the inside-diameter holding jig; and arranging an outside-diameter-holding magnet-pressure-welding jig to support outside peripheral faces of the bonded-magnet formed bodies. The method further includes steps of: deforming the bonded-magnet formed bodies to fit with the outside peripheral dimension of the rotor core by pressing and transferring the bonded-magnet formed bodies to the rotor core with a forming jig; mutually joining end portions of adjacent ones of the bonded-magnet formed bodies; and integrating the bonded-magnet formed bodies with the rotor core by compressing the bonded-magnet formed bodies.Type: ApplicationFiled: March 23, 2012Publication date: December 12, 2013Applicant: PANASONIC CORPORATIONInventor: Hiroki Asai
-
Patent number: 8569920Abstract: In a small electric motor having a stator and a rotor which includes a solid-cylindrical permanent magnet and at least one shaft element mounted on a face of the permanent magnet and bonded thereto by adhesive, the shaft element has at least one recess on its face facing the permanent magnet. The adhesive is introduced into the recess and contacting the face of the permanent magnet in the area of the recess.Type: GrantFiled: June 9, 2011Date of Patent: October 29, 2013Assignee: Maxon Motor AGInventors: David Ramon, Hugo Fritschy, Jens Oliver Schulze, Hans-Georg Jansing, Raniero Pittini, Minh Hieu Lam, Alexis Boletis
-
Publication number: 20130241338Abstract: A rotor includes a shaft, a plurality of permanent magnets arranged around the shaft in a circumferential direction for permanent excitation and attached to the shaft by an adhesive bond, and a flux conducting device provided for conducting a magnetic flux of the permanent magnets. The flux conducting device has a plurality of soft-magnetic flux conducting elements. Each flux conducting element is placed between two of the permanent magnets and adhesively bonded thereto.Type: ApplicationFiled: March 15, 2013Publication date: September 19, 2013Applicant: Siemens AktiengesellschaftInventors: Daniel Mader, Rolf Vollmer
-
Publication number: 20130241324Abstract: A rotor includes a shaft and a plurality of permanent magnets which are arranged around the shaft in a circumferential direction for permanent excitation. At least one of the permanent magnets is attached to the shaft by a material joint or formfit. A flux conducting device for conducting a magnetic flux of the permanent magnets has a plurality of separate soft-magnetic flux conducting elements, with each flux conducting element being mounted between two of the permanent magnets and fixed thereto so as to be indirectly held in place on the shaft. At least one of the flux conducting elements has at least one contact area sized to cover an outer edge of one of the permanent magnets in the radial direction.Type: ApplicationFiled: March 15, 2013Publication date: September 19, 2013Applicant: Siemens AktiengesellschaftInventors: Daniel Mader, Rolf Vollmer
-
Publication number: 20130229083Abstract: An improved structure for brushless motors comprises a stationary part and a rotary or movable part mounted relative to the stationary part. The rotary part includes a frame and a plurality of magnets disposed, one after another, along one surface of the frame and attached to the surface of the frame adjacent to the stationary part, wherein each of the magnets has a curved surface so as to define a series of gaps between the curved surfaces of the magnets and the surface of the frame of the rotary or movable part. With the present invention, the airgap between the stationary part and rotary or movable part would be more uniform, and the motor can be manufactured more easily. Also, when running the motor, cogging or no-current torque can be reduced or eliminated, so that the motor can be operated more smoothly.Type: ApplicationFiled: March 2, 2012Publication date: September 5, 2013Inventor: HSIU-MEI CHANG
-
Publication number: 20130200740Abstract: A rotor for an electric motor. A rotor for an electric motor has a main rotor body which includes radial support surfaces. In addition, the rotor has permanent magnet bodies which are arranged radially externally on the radial support surfaces. Associated with each permanent magnet body is a sheet metal holder which at least partially covers the respective permanent magnet body on the side thereof remote from the support surface and which is designed and arranged such that it secures this permanent magnet body in the radial direction.Type: ApplicationFiled: October 13, 2011Publication date: August 8, 2013Inventor: Lothar Schröder
-
Patent number: 8482177Abstract: Disclosed is a torque rotor and method for manufacturing the torque rotor having an effect of preventing inflow of plastic between a yoke and a magnet during a conventional plastic injection molding process for forming an assembling structure after assembling between the yoke and the magnet, thereby preventing degradation of a roundness of the magnet or damage of the magnet due to the difference in the temperature expansion coefficients, and preventing idle rotation of the yoke and the magnet relative to each other.Type: GrantFiled: March 26, 2010Date of Patent: July 9, 2013Assignee: Mando CorporationInventor: Chae-soo Kim
-
Patent number: 8450897Abstract: A rotor for motor may include a rotation shaft, a permanent magnet structured in a tube-like shape and fixed to an outer peripheral side of the rotation shaft, and a sleeve which is structured in a tube-like shape, disposed between an outer peripheral face of the rotation shaft and an inner peripheral face of the permanent magnet, and press-fitted and fixed to the outer peripheral face of the rotation shaft. The sleeve is retreated from an end part of the permanent magnet on one side in an axial direction to the other side in the axial direction so that a first ring-shaped recessed part is formed between the rotation shaft and the permanent magnet and the rotation shaft and the permanent magnet are fixed to each other with a first adhesive in the first ring-shaped recessed part. The rotor may be applied to a motor, preferably to a stepping motor.Type: GrantFiled: October 20, 2010Date of Patent: May 28, 2013Assignee: Nidec Sankyo CorporationInventor: Hidekazu Yoneyama
-
Publication number: 20130099617Abstract: An electric machine having a rotor with an axially extending magnet slot. A magnetic material is mounted in a magnet holder to form a magnet holder assembly which is installed in the magnet slot of the rotor. In some embodiments, the magnet holder assembly substantially fills the entire slot volume. In other embodiments, the magnet holder assembly defines a greater thickness of dielectric material between the magnetic material and the major side of the slot nearest the stator than between the magnetic material and the opposite side of the slot. In still other embodiments, a plurality of axially abutting magnet holder assemblies are installed in the magnet slot. In yet other embodiments, the magnet holder comprises two materials with different durometer values wherein one of the materials is resiliently, compressibly engaged with the slot to secure the magnet holder assembly therein. A method of manufacture is also disclosed.Type: ApplicationFiled: October 24, 2011Publication date: April 25, 2013Inventor: Bradley D. Chamberlin
-
Publication number: 20130002079Abstract: There is provided a motor including: a sleeve supporting a shaft; a hub operating together with the shaft and including a magnet; a base coupled to the sleeve and including a core having a coil wound therearound, the coil generating rotational driving force; and a magnetic flux increase space part formed to be enclosed between the magnet and the hub in order to increase magnetic flux density between the magnet and the core.Type: ApplicationFiled: November 14, 2011Publication date: January 3, 2013Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Sang Jin Park, Ta Kyoung Lee
-
Publication number: 20120326549Abstract: A method of fixing a permanent magnet in a rotor of a driving motor, e.g., for a vehicle, includes inserting the permanent magnet into a core of the rotor and fixing the permanent magnet by supplying resin to the permanent magnet, wherein a coefficient of thermal expansion of the resin is substantially equal to that of the rotor core.Type: ApplicationFiled: December 7, 2011Publication date: December 27, 2012Applicants: KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANYInventors: Jaewon Ha, Jaeyoung Kie, Jungwoo Lee
-
Publication number: 20120313474Abstract: A rotor of a rotary electric machine according to the present invention includes: a rotor core arranged on the outer circumferential side of a rotor shaft; and a plurality of magnetic poles fixed to the rotor core and circumferentially arranged on the rotor core, the rotor including a non-magnetic ring attached by insertion to the outer circumference of the plurality of the magnetic poles and having a substantially polygonal shape in outer circumferential shape. The non-magnetic ring is configured such that the inner circumferential length L of the non-magnetic ring before assembly with respect to the length of an envelope L0 of tangent lines each between the outer circumferential surface of the magnetic pole and the outer circumferential surface of the adjacent magnetic pole is set to L?L0. An object is to obtain the rotor of the rotary electric machine capable of achieving reduction in size and cost.Type: ApplicationFiled: June 10, 2010Publication date: December 13, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Akihiro Yamamura, Kazuhisa Takashima, Hidechika Fujii, Masayuki Miyaoka, Satoru Akutsu
-
Patent number: 8324778Abstract: The invention relates to a permanent magnet rotor, which has a rotor shaft, a rotor stack fixed on the rotor shaft, accommodating pockets provided in the rotor stack and permanent magnets positioned in the accommodating pockets. The accommodating pockets are sealed by means of an adhesive film, as a result of which the permanent magnets are fixed in the accommodating pockets and at the same time the ingress of particles into the accommodating pockets and the discharge of particles out of the accommodating pockets is prevented.Type: GrantFiled: October 31, 2007Date of Patent: December 4, 2012Assignee: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, WürzburgInventor: Marcus Podack
-
Patent number: 8310122Abstract: A rotating machine has a stator and a permanent magnet rotor that is more easily made, lower cost, and lighter by virtue of a plurality of permanent magnet assemblies mounted on a rotor body. Each magnet assembly includes two facing core plate stacks supporting a permanent magnet between them. Each core plate stack is made from a plurality of core plates of substantially identical size and shape and with on or more holes in substantially the same location to form respective bores in the stack. A tie rod is formed in each bore and retains the plates in a stack via bevels in the holes of the end plates. Preferably, the tie rods also apply compressive force as a result of placing the stacked plates in an injection mold, injecting plastic into the mold to fill each bore with plastic, and allowing the plastic to cure. As the plastic cures, it shrinks so that the tie rods pull the end plates together. To enhance the pressure, the stacked plates can be compressed before and during the injection process.Type: GrantFiled: September 27, 2006Date of Patent: November 13, 2012Assignee: Wilic S.A.R.L.Inventors: Otto Pabst, Franco Gadrino
-
Publication number: 20120223607Abstract: A rotor includes a rotor core and permanent magnets each of which is received in a corresponding slot of the rotor core with its magnetization direction being oblique to a radial direction of the rotor core. Each of the permanent magnets has a first corner portion positioned radially outermost and a second corner portion positioned radially innermost. For each of the permanent magnets, there are formed first and second gaps respectively between the first corner portion and the inner surface of the corresponding slot and between the second corner portion and the inner surface of the corresponding slot in a reference direction of the permanent magnet. The rotor core also has, for each of the permanent magnets, supporting portions each of which abuts and thereby supports, in the reference direction, a predetermined portion of the permanent magnet which is positioned away from both the first and second corner portions.Type: ApplicationFiled: March 2, 2012Publication date: September 6, 2012Applicant: DENSO CORPORATIONInventors: Kazunori UCHIYAMA, Naoki HAKAMADA, Masahiro SEGUCHI
-
Patent number: 8258664Abstract: A hybrid motor for powering a compressor of a chiller system includes a first rotor portion and a first stator portion configured as a permanent magnet motor and a second rotor portion and a second stator portion configured as a reluctance motor. The second rotor portion includes a reluctance-type rotor, and the second stator portion includes electromagnetic windings capable of inducing a rotary magnetic field. The first rotor portion and the second rotor portion are attached to a common drive shaft. The reluctance motor is arranged to generate start-up torque and initiate rotation of the drive shaft until the drive shaft achieves a predetermined rotational speed. The permanent magnet motor is arranged to power the drive shaft between the predetermined rotational speed and a maximum rotational speed.Type: GrantFiled: October 2, 2009Date of Patent: September 4, 2012Assignee: Johnson Controls Technology CompanyInventors: Justin D. Warner, Ivan Jadric, Michael S. Todd, Zhiqiao Wu, Shreesha Adiga Manoor, Konstantin Borisov, Scott Victor Slothower, Kanishk Dubey, John C. Hansen
-
Publication number: 20120161565Abstract: The invention relates to a method for adhesively bonding a magnet onto the surface or into a slot of a rotor or stator of an electric motor or a generator, wherein i) the surface or surfaces to be glued of the magnet, rotor or stator are pre-coated with an adhesive that is not liquid at 22° C. and that does not cure without an activation step, iii) the magnet is brought into contact with the rotor or stator at the adhesive location, and iv) the adhesive is activated by heating or by high-energy radiation so that it cures, characterized in that the adhesive comprises a) at least one reactive epoxide prepolymer, b) at least one latent hardener for epoxies, and c) one or more elastomers. The adhesive preferably comprises a blowing agent. The invention further relates to a corresponding pre-coated magnet.Type: ApplicationFiled: January 20, 2012Publication date: June 28, 2012Applicant: Henkel AG & Co. KGaaInventors: Eugen Bilcai, Emilie Barriau, Stefan Haslberger
-
Patent number: 8203245Abstract: A motor rotor has: a rotor yoke; a plurality of magnet fixing sections formed on the lateral surface of the rotor yoke; segment magnets respectively fixed to the magnet fixing sections and extending in the axial direction of the rotor yoke; and a plurality of projections which are provided, on the rotor yoke, at each boundary section located between each of the adjacent magnet mounting sections, and which protrude outward from the rotor yoke; and a pair of end claws are formed by bifurcating the end of each projection into two prongs, and each of the end claws is locked to the outer surface of each of the segment magnets.Type: GrantFiled: April 20, 2009Date of Patent: June 19, 2012Assignee: JTEKT CorporationInventors: Ryuji Ishikawa, Jiro Nakano
-
Publication number: 20120139377Abstract: An interior permanent magnet motor in provided which is made up of a permanent magnet, and a rotor core of which an insertion aperture for the permanent magnet to be inserted thereinto is formed in the rotor core. Additionally, the interior permanent magnet motor includes a first end plate which is connected to the rotor core and of which a first seating portion for the permanent magnet is disposed thereto is formed in the first seating portion and a second end plate which is connected to the rotor core and of which a second seating portion for the permanent magnet is disposed thereto is formed in the second end plate.Type: ApplicationFiled: June 29, 2011Publication date: June 7, 2012Applicant: HYUNDAI MOTOR COMPANYInventor: Myunggyu Kim
-
Publication number: 20120139378Abstract: A rotor that can reduce the used amount of resin for securing a permanent magnet is provided. The rotor includes a rotor core provided fixedly to a rotation shaft and having a magnet insertion hole extending in an axial direction formed therein, a permanent magnet embedded in the magnet insertion hole and extending in the axial direction and extending in a direction inclined relative to a radial direction of the rotor core, and a resin layer that secures the permanent magnet to the rotor core. The resin layer covers a surface of the permanent magnet and is in contact with an inner surface of the magnet insertion hole. A hollow space extending in the axial direction is left in the magnet insertion hole at an inner side in the radial direction relative to the permanent magnet. Part of the inner surface of the magnet insertion hole is exposed to the hollow space.Type: ApplicationFiled: December 22, 2009Publication date: June 7, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Yasuhiro Endo
-
Publication number: 20120098271Abstract: The invention relates to methods for manufacturing a rotor (14) for an electric machine (13), having the following method steps: a) manufacturing a magnetic element (8) by bonding permanent magnets (1, 1?, 1?, 1??) by means of a first adhesive, each permanent magnet (1, 1?, 1?, 1??) having a side with a magnetic North pole (N) and a side with a magnetic South pole (S), the permanent magnets (1, 1?, 1?, 1??) being arranged during bonding such that the sides of the magnetic North poles (N) or the sides of the magnetic South poles (S) form a common underside (3, 3?, 3?, 3??) of the magnetic elements (8), the first adhesive having a hard consistency in the cured state; and b) bonding the underside of the magnetic element (8) to a yoke (12) by means of a second adhesive, the second adhesive being soft and elastic in the cured state. Furthermore, the invention relates to an associated rotor.Type: ApplicationFiled: May 6, 2010Publication date: April 26, 2012Inventors: Heiner Bayer, Ludwig Erd, Ulrich Hartmann, Torsten Metzner, Axel Möhle
-
Publication number: 20120049662Abstract: A rotor that includes a rotor core assembly secured to a shaft. The rotor core assembly includes a magnet and an end cap secured to an end of the magnet. Each of the magnet and the end cap has a bore into which the shaft extends. The end cap forms an interference fit with the shaft. The magnet forms a clearance fit with the shaft and an adhesive is located in the clearance between the magnet and the shaft. Additionally, a method of manufacturing the rotor. The method includes inserting the shaft into the bore of the end cap. An adhesive is then introduced into the bore of the magnet and the shaft is inserted into the bore of the magnet so as to cause adhesive to be drawn into the clearance defined between the magnet and the shaft.Type: ApplicationFiled: August 18, 2011Publication date: March 1, 2012Applicant: Dyson Technology LimitedInventor: David IONS
-
Publication number: 20120049661Abstract: A rotor core assembly that includes a magnet, a first end cap located at an end of the magnet, a second end cap located at an opposite end of the magnet, and a sleeve that surrounds the magnet and the end caps. The sleeve forms an interference fit with each of the end caps, and an adhesive is located between the magnet and the sleeve. Additionally, a method of manufacturing the rotor core assembly.Type: ApplicationFiled: August 18, 2011Publication date: March 1, 2012Applicant: Dyson Technology LimitedInventors: David IONS, Paul Theo HEYTING, Matthew John CHILDE, David Michael Jones
-
Patent number: 8087156Abstract: In spindle motors journaled on fluid-dynamic-pressure bearings, especially in such spindle motors employed in recording-disk drives in implementations that subject the drives to vibration and shock, sealing performance of a capillary seal formed between motor rotor-side and stator-side bearing surfaces, cohesiveness of oil-repellant on rotor-side/stator-side dry-area surfaces adjoining the capillary seal section, and motor inter-component adhesive strength are improved. The capillary-seal-constituting rotor-side/stator-side surface(s) are exposed to a plasma or to ultraviolet rays under predetermined conditions to improve the wettability of the surface(s) for the bearing fluid. The dry-area surface(s) are similarly irradiated so as to improve their wettability for the oil-repellant. Adhesively bonded component surfaces are likewise irradiated so as to improve their wettability for the adhesive, enhancing adhesive strength.Type: GrantFiled: December 7, 2009Date of Patent: January 3, 2012Assignee: Nidec CorporationInventors: Masato Gomyo, Takehito Tamaoka
-
Publication number: 20110304234Abstract: In a small electric motor having a stator and a rotor which includes a solid-cylindrical permanent magnet and at least one shaft element mounted on a face of the permanent magnet and bonded thereto by adhesive, the shaft element has at least one recess on its face facing the permanent magnet. The adhesive is introduced into the recess and contacting the face of the permanent magnet in the area of the recess.Type: ApplicationFiled: June 9, 2011Publication date: December 15, 2011Applicant: Maxon Motor AGInventors: David Ramon, Hugo Fritschy, Jens Oliver Schulze, Hans-Georg Jansing, Raniero Pittini, Minh Hieu Lam, Alexis Boletis
-
Patent number: 8040015Abstract: The invention relates to a rotor for an electric motor, comprising a rotor shaft, a rotor core stack that is attached to the rotor shaft, a ring member which surrounds the rotor core stack, and a gap located between the rotor core stack and the ring member. Adhesive is introduced into the gap for fastening the ring member to the rotor core stack. Molded articles that are used as spacers are admixed to the adhesive.Type: GrantFiled: July 26, 2007Date of Patent: October 18, 2011Assignee: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, WürzburgInventor: Klaus Zaps
-
Patent number: 8040006Abstract: A motor rotor has a rotor yoke having a polygonal column structure, a plurality of magnet fixing sections formed on the lateral surface of the rotor yoke, segment magnets respectively fixed to the magnet fixing sections and extending in the axial direction of the rotor yoke, and projections provided on the rotor yoke and protruding outward from the rotor yoke, the projections being provided at each boundary section located between each of the adjacent magnet fixing sections and being provided in pairs in the axial direction of the rotor yoke.Type: GrantFiled: April 23, 2009Date of Patent: October 18, 2011Assignee: JTEKT CorporationInventor: Toshiaki Murakami
-
Publication number: 20110210635Abstract: A magnet rotor assembly comprises a magnet sleeve held on a rotor shaft by a rigid adhesive layer that includes at least one axial wedge shape corresponding to an axial irregularity on at least one of the surfaces bonded by the adhesive layer. Improved crush strength in the magnet sleeve and in other bonded metal parts, both initially and after exposure to high temperatures is accomplished by impregnating the parts with a curable resin.Type: ApplicationFiled: February 27, 2011Publication date: September 1, 2011Inventors: Stanley Byron Musselman, Edward E. Welker, Mitchell L. Spencer, Viswanathan Panchanathan
-
Publication number: 20110204739Abstract: An assembly for mounting magnets on a steel sheet rotor pack, the assembly including a plurality of baseplates made of a magnetic material and fixed to the rotor pack, and a plurality of magnets being in turn fitted to each baseplate. In one embodiment, the baseplates are fixed to the rotor pack by means of inner locking bars housed in axial ducts provided inside said rotor pack. The baseplates are fitted to the inner locking bars by fixing means passing through longitudinal channels connecting the axial ducts and the outer surface of the rotor pack.Type: ApplicationFiled: February 24, 2010Publication date: August 25, 2011Inventors: Adolfo Rebollo Gomez, Xabier Calvo Madariaga, Jose Antonio Estibariz Aristi, Gaizka Diaz Barrenetxea, Jon Vaquerizo Ayastuy, Nestor Churruca Gabilondo, Javier Sanchez Castaño, Marta Avis Plata, Julen Legorburu Aramburu
-
Publication number: 20110198959Abstract: An interior permanent magnet (IPM) machine having a rotor and a stator is provided. The rotor includes a radially inner barrier devoid of magnets, and a radially outer barrier having at least one permanent magnet, each barrier having two pockets with one pocket disposed at an angle relative to the other. At least one of the pockets of the inner barrier has a shape of an irregular quadrilateral. At least one of the pockets of the outer barrier has a substantially trapezoidal shape with a first side generally parallel to a second side, wherein the first side has a portion slanted relative to the third side. In such an IPM machine, demagnetization of the outer barrier magnet is limited when operating temperatures and electrical current exceed operating conditions prescribed by design specifications.Type: ApplicationFiled: February 17, 2010Publication date: August 18, 2011Inventor: Rajeev Vyas
-
Patent number: 7973442Abstract: A production method for a rotor for a permanent magnet-type rotary electric machine, includes the step (S01, S02) of forming a magnet piece that has a plurality of groove portions that are provided on at least one of end surfaces of the magnet piece in a predetermined direction, the step (S03) of stacking a plurality of formed magnet pieces so that adjacent magnet pieces contact each other and the plurality of groove portions of one of the adjacent magnet pieces cross with the plurality of groove portions of another one of the adjacent magnet pieces, and the step (S04) of inserting and disposing the plurality of stacked magnet pieces into a hole formed in a rotor core.Type: GrantFiled: May 16, 2008Date of Patent: July 5, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventor: Toshimitsu Takahashi
-
Patent number: 7965009Abstract: A motor rotor has a resin-impregnated thread layer formed by winding a thread of a reinforced fiber material around a permanent magnet layer with a gap between an outer peripheral surface of the thread layer and an inner peripheral surface of a cylindrical body, and impregnating the thread layer with a curable resin. A subsequent thread layer is formed by leading a continuous thread into an annular passage through thread passing recesses, winding the continuous thread around a bottom portion of the passage, and impregnating the subsequent thread layer with a curable resin. A curable resin is injected into the gap between the outer peripheral surfaces of the thread layer and the subsequent thread layer and the inner peripheral surface of the cylindrical body through resin injection passages and/or the thread passing recesses before heating and curing.Type: GrantFiled: October 16, 2007Date of Patent: June 21, 2011Assignee: Sanyo Denki Co., Ltd.Inventors: Toshihito Miyashita, Takashi Matsushita, Norihito Tanaka
-
Publication number: 20110122529Abstract: A hub includes first and second side surfaces respectively opposed to inner and outer circumferential surfaces of an upper portion of a magnetic member, and a ceiling surface arranged to interconnect an upper ends of the first and second side surfaces. The adhesive agent is interposed between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and between the upper surface of the magnetic member and the ceiling surface of the hub. Radial distance between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and axial distance between the upper surface of the magnetic member and the ceiling surface of the hub are smaller than radial distance between the outer circumferential surface of the upper portion of the magnetic member and the second side surface of the hub.Type: ApplicationFiled: March 29, 2010Publication date: May 26, 2011Applicant: NIDEC CORPORATIONInventors: Keita Hamakawa, Daisuke Adachi, Takuro Jimbu, Takayuki Iwase
-
Patent number: 7948136Abstract: To reduce the cogging torque of servomotors, electric power steering motors, and others, there is provided a permanent magnet motor comprising: a rotor 10 comprising a rotor yoke 11 and a plurality of permanent magnets (M1-M10); and a stator 20 comprising a stator yoke 22, salient magnetic poles 21, and armature windings 23, wherein at least one of the permanent magnets is disposed in an adjustment position that is displaced from a corresponding reference position in at least one of the circumferential, radial, and axial directions of the rotor yoke, and the plurality of permanent magnets excluding the permanent magnet disposed in the adjustment position is disposed in the reference positions, and wherein the adjustment position is set so that the permanent magnet motor in which at least one of the plurality of permanent magnets is disposed in the adjustment position has a smaller cogging torque than a permanent magnet motor in which all of the plurality of permanent magnets are disposed in the reference posiType: GrantFiled: August 17, 2005Date of Patent: May 24, 2011Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Koji Miyata
-
Patent number: 7948138Abstract: A rotor is provided with a rotor core, a magnet inserted into the rotor core and a filling portion arranged in a space between the rotor core and the magnet. The space between the rotor core and a radially outer side surface of the magnet has a uniform width in a central portion (portion (A)) with respect to a width direction (of arrow (DR4)) of the magnet. A width of the space in an end portion (portion (B)) with respect to the width direction (of arrow (DR4)) of the magnet is larger than that of the space in the portion (A).Type: GrantFiled: November 17, 2005Date of Patent: May 24, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hiroyuki Hattori, Akihide Takehara
-
Publication number: 20100295401Abstract: A motor includes a stator which includes: a stator core having an annular stator yoke, a plurality of outer teeth projecting outward from the stator yoke, and a plurality of inner teeth having the same number of teeth as the outer teeth and projecting inward from the stator yoke; and a plurality of windings wound on the stator core, and the motor includes an outer rotor confronting the outer teeth via an air gap and an inner rotor confronting the inner teeth via an air gap. The outer rotor and the inner rotor have holes for accommodating permanent magnets respectively. The permanent magnets having a rectangular shape in sectional views thereof are accommodated in the holes.Type: ApplicationFiled: January 9, 2007Publication date: November 25, 2010Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Yukinori Nakagawa, Yuichi Yoshikawa, Hu Li, Masahiko Morisaki, Hiroshi Murakami
-
Publication number: 20100264758Abstract: An electric motor (20) has a stator (30) and a rotor (26). The latter is equipped with a cup-like rotor part (56) and with a ring magnet (60) adhesively bonded therein, which magnet has an outer circumference (61) on which are provided elevations (84) and depressions (86) that extend at least partly in the longitudinal direction of the ring magnet (60). The outer circumference (61) of the ring magnet (60), that faces toward the cup-like rotor part (56) after assembly, is formed with at least one opening or channel (68; 69, 88), extending in a circumferential direction, that is connected to at least a plurality of the flat depressions (86). Positive mechanical engagement between adhesive and ring magnet enhances durability, and discourages any tendency toward relative rotation between the magnet (60) and the cup-like rotor part (56).Type: ApplicationFiled: July 21, 2008Publication date: October 21, 2010Inventors: Rainer Strohm, Tobias Maier, Volker Hildebrand, Juergen Pfaff, Arno Karwath
-
Patent number: RE43055Abstract: A permanent magnet type generator includes a rotor having 4n (n is a positive integer) permanent magnet poles disposed in a circumferential direction of the rotor to have circumferential gap between adjoining poles and a stator that has 3n teeth and coils wound around the teeth. The stator core includes a pair of core end plates and a laminate core disposed between the core end plates. Each core end plate has a circumferential width that relates to the gap distance at portions opposite the permanent magnet poles.Type: GrantFiled: September 11, 2009Date of Patent: January 3, 2012Assignees: Denso Corporation, Denso Trim Co., Ltd.Inventor: Norikazu Takeuchi