Patent application number | Description | Published |
20080224574 | STEPPING MOTOR AND STEEL PLATE FOR MANUFACTURING THE STEPPING MOTOR - A stepping motor comprising: | 09-18-2008 |
20080267807 | CORE ROD FOR FORMING A CYLINDRICAL GREEN COMPACT, APPARATUS FOR FORMING A CYLINDRICAL GREEN COMPACT, AND METHOD FOR FORMING A CYLINDRICAL GREEN COMPACT - A core rod for forming a cylindrical green compact having an axial protrusion or a radial step portion or dent portion on an inner surface of the cylindrical member by powder compaction, wherein: the core rod is provided with a step portion protruding in a radial direction at least a part on an outer surface thereof; the core rod is divided into two parts, an upper core and a lower core, on a plane that is flush with an upper surface of the step portion; and the upper core and lower core are mechanically joined with fastening members or bonded with an adhesive on a plane along which the core rod is divided. | 10-30-2008 |
20090108713 | Outer Rotor Type Hybrid Stepping Motor - An outer rotor type hybrid stepping motor includes a stator, a rotor, a magnet disposed axially in the stator or the rotor, a stator core disposed inwardly from a gap between the stator and rotor, and a stator winding on the stator core. The rotor is disposed outside the gap. The magnet has an axial cross sectional area A. The residual magnetic flux density of the magnet is Br, and a total of magnetic fluxes exiting axially from the surface is A×Br. A gap average magnetic flux density, determined by dividing A×Br by the top cross sectional area small teeth poles on the rotor is Bg; pitch of the teeth is τ; and tooth width is Tw. Average magnetic flux density Bg, tooth pitch τ, and tooth width Tw are determined by the equation K=1/(π×Bg×Tw/τ), with the coefficient k in a range of 0.56-0.66 (1/T). | 04-30-2009 |
20100148611 | ARMATURE CORE, MOTOR USING SAME, AND AXIAL GAP ELECTRICAL ROTATING MACHINE USING SAME - An armature core includes a core portion formed of a lamination of plural noncrystalline metallic foil bands and resin for bond-fixing the non-crystalline metallic foil bands, wherein the armature core is provided with at least two cut surfaces with respect to the lamination layers. Amorphous metal is used as the iron base of the non-crystalline metallic foil bands. The cut surfaces are perpendicular to the lamination-layers of the non-crystalline foil bands. For the amorphous core, a resin mold is formed. The contact portions between winding wires and amorphous are provided with edge roundness. Further, an axial gap motor using cut cores of amorphous lamination as stator cores is provided. Still further, the stator includes: a plurality of stator cores in a bar shape, the stator cores being disposed along circumferential direction, wherein the axial line of the rotor shaft is the central axis of the circumferential direction, and wherein an axial direction of the stator cores is along the axial line direction AX of the rotor shaft; a stator core holding member in a disc form, the stator having a plurality of holes or recessions that are substantially in the same shape as a cross-sectional shape of the stator cores and are arranged along the circumferential direction, wherein the axial line of the rotor shaft is the central axis of the circumferential direction; and coils wound around the stator cores, and wherein the stator cores are inserted in the holes or recessions of the stator core holding member and held by fixing in vicinities of respective central portions thereof, the central portions being with respect to the axial direction thereof. | 06-17-2010 |
20100226803 | Electric Pump - A pump is driven by a compact electric motor in which a coil is disposed in a ring form around and along a stator core which has a plurality of claw magnetic poles that extend alternately from both ends of one member of the stator core toward the end of the other member thereof. A stator core can be made from a compressed powder core by molding with resin, with the molded portion able to serve as a partition separating pump and motor units. | 09-09-2010 |
20110062817 | STATOR CORE FOR DYNAMO-ELECTRIC MACHINE AND MANUFACTURING METHOD THEREFOR - A claw-pole type dynamo-electric machine, from which an improvement in productivity of stator winding can be expected, has such as a structure that the whole stator wiring is covered with a magnetic body, and thereby the inductance increases to pose the problem of decreasing a power factor. Disclosed is a stator core of a dynamo-electric machine in which a plurality of stator cores of respective phases are arranged independently in the direction of the rotating shaft of a rotor, the magnetic poles of the stator cores are arranged in the shape of a wave in the circumferential direction of the rotating shaft of a rotor, slots extending in the direction of the rotating shaft are formed between respective magnetic poles, and the stator winding can be arranged in a slot formed on the side of the inner end face of the magnetic pole arranged in the shape of a wave and in the axial direction of the rotating shaft. | 03-17-2011 |
20110095628 | AXIAL GAP MOTOR, COMPRESSOR, MOTOR SYSTEM, AND POWER GENERATOR - The present invention provides a low-iron-loss (high-efficiency) and low-cost axial gap motor that includes a high-quality soft magnetic material placed at an appropriate position, reduces torque pulsation, keeps induced voltage in the shape of a sine wave, and increases the degree of freedom in design. The axial gap motor includes a stator having stator teeth; and a rotor being opposed to the stator with a gap in an axial direction of the stator. Each of the stator teeth includes a stator tooth body, a stator tooth end joined to at least one axial-direction end of the stator tooth body, and a stator coil disposed around the stator tooth body. The stator tooth body includes a wound core comprised of a multi-layered amorphous foil strip winding. The stator tooth end is formed by a compact made of a powder magnetic core, and includes an opposed surface to the rotor. A cross-sectional area of the stator tooth end perpendicular to an axis of the amorphous foil strip winding is larger than a cross-sectional area of the stator tooth body perpendicular to the axis of the amorphous foil strip winding. | 04-28-2011 |
20110095642 | MAGNETIC IRON CORE, METHOD FOR MANUFACTURING THE SAME, AXIAL-GAP ROTATING ELECTRICAL MACHINE, AND STATIC ELECTRICAL MACHINE - The invention provides a high-quality magnetic iron core by concurrently satisfying requirements for enhancement in strength of a wound iron core, particularly, strength of a wound iron core made up of amorphous foil strips, reduction in manufacturing time, and manufacturing cost. The invention also provides an electromagnetic application product highly efficient and small in size as an application of the magnetic iron core. The magnetic iron core includes an amorphous foil strip being wound to form the magnetic iron core. The magnetic iron core is filled with resin, the resin being disposed in every plural turns of windings of the amorphous foil strip. Preferably, the magnetic iron core is filled with the resin, the resin being disposed by using a spacer in every plural turns of windings of the amorphous foil strip. Preferably, the magnetic iron core is covered with resin which is integrated with and continuous to the resin disposed in every plural turns of windings of the amorphous foil strip. | 04-28-2011 |
20110148224 | AXIAL GAP PERMANENT MAGNET MOTOR, ROTOR USED FOR THE SAME, AND PRODUCTION METHOD OF THE ROTOR - A stator and a rotor are oppositely arranged having a gap between the stator and the rotor in a direction parallel to a rotary shaft. The rotor has permanent magnets forming field magnetic poles and soft magnetic material segments to cover at least stator-facing surfaces of the respective permanent magnets. Each of the soft magnetic materials forms a composite part together with the permanent magnet. The rotor further has a disc-shaped nonmagnetic molded frame molded so as to cover the periphery of the composite part including the permanent magnet and the soft magnetic material segment while leaving a stator-facing surface of the soft magnetic material segment as an exposed surface. The composite part (including the permanent magnet and the soft magnetic material) and the nonmagnetic molded frame are integrated by molding of the molded material. | 06-23-2011 |
20110156519 | AXIAL GAP ROTATING ELECTRICAL MACHINE AND ROTOR USED THEREFOR - In the axial gap rotating electrical machine, the rotor includes a rotor yoke that is formed by wrapping amorphous ribbon wound toroidal core, which is obtained by winding an amorphous magnetic metal ribbon into a toroidal core. Magnets having plural poles are circumferentially disposed on a stator-facing surface of the amorphous ribbon wound toroidal core. | 06-30-2011 |
20110234028 | ROTARY ELECTROMOTOR - There is disclosed a rotary electromotor including a stator, a stator winding on the stator, a stator frame, a rotator, end covers, and a highly heat-conductive member. The stator has a plurality of magnetic poles. The stator frame supports the stator. The rotator is supported by the stator with a gap therefrom such that the rotator is rotatable. The end covers close opposite ends of the stator frame. The highly heat-conductive member is fixed by a resin material in a space defined inside the stator, the stator frame, and the end covers. | 09-29-2011 |
20110273033 | ROTARY ELECTRIC MACHINE - A rotary electric machine having a stator whose dismantled structure can be reintegrated at reduced cost. The stator eliminates difficulties in separation and reuse at the time of disposal incident to use of molding such as resin molding. Also, it has no adverse environmental impacts. | 11-10-2011 |
20120194021 | MAGNETIC GEAR - A magnetic gear comprises a first permanent magnet field having a plurality of permanent magnet magnetic poles, a second permanent magnet field having a plurality of permanent magnet magnetic poles, number of poles of which magnet is different from that of the first permanent magnet field, and a modulating magnetic pole arranged between the first permanent magnet field and the second permanent magnet field and having a plurality of pole pieces to modulate the number of poles of the first and second permanent magnet fields. Non-magnetic bars are provided between the plurality of pole pieces. One ends of the non-magnetic bars are fixed to a first non-magnetic end holding member and the other ends of the non-magnetic bars are electrically insulated from and fixed to a second non-magnetic end holding member. | 08-02-2012 |
20120248930 | WOUND CORE, ELECTROMAGNETIC COMPONENT AND MANUFACTURING METHOD THEREFOR, AND ELECTROMAGNETIC EQUIPMENT - A wound core formed of a magnetic thin band, an electromagnetic component and a manufacturing method therefor and electromagnetic equipment in which iron loss and cost reduction can be achieved are provided. The wound core is a wound core formed by winding a magnetic thin band in the axial direction. A cutout portion is formed from place to place on an end face of the thin band in the axial direction and the cutout portions are arranged in random directions in the direction of the radius of the wound core. | 10-04-2012 |
20130002076 | MAGNETIC GEAR MECHANISM - A magnetic gear mechanism including a simplified assembly of a magnetic flux modulating section in the magnetic gear mechanism which improves the strength thereof. In the magnetic flux modulating section of the magnetic gear mechanism, the magnetic flux modulating section being formed of a magnetic member and a non-magnetic member, a piece of the magnetic member and a piece of the non-magnetic member are separately produced. The piece of the magnetic member is sandwiched between circumferential projections provided in pieces of the non-magnetic member, and the magnetic member and the non-magnetic member and bearing holding sections form a structure in which the magnetic member and the non-magnetic member are fitted into the bearing holding sections by using recessed portions provided in the bearing holding sections and axial projections provided in the pieces of the non-magnetic member. This structure simplifies production and improves strength. | 01-03-2013 |
20130320795 | Magnetic Gear Mechanism - The present invention is intended to provide a magnetic gear structure that realizes a magnetic gear that transmits a torque efficiently by reducing eddy currents generated in the interior of magnets. In order to solve the subject described above, in the magnetic gear structure, a structure in which magnets are arranged in the interior of an iron core in an inner rotor portion. Bonded magnets formed by molding, for example, NdFeB powder may be used as the magnets. Since the influence of the eddy current on the side of an outer rotor having a larger pole number is large, a structure in which the magnets are arranged in the interior only of an outer rotor portion having a larger pole number is also applicable. In addition, the magnets to be embedded may be divided into a plurality of pieces. The finer the division of the magnets, the less eddy currents are generated, so that a method of further fining down and assembling the same is also effective. Further reduction of the eddy currents is possible by laminating the plate-shaped magnets having a thickness equivalent to an electromagnetic steel plate in the axial direction. | 12-05-2013 |
20130328429 | Motor Unit, and Dynamo-Electric Machine and Dynamo-Electric Machine Device that Use Same - Provided are: a low cost, high-performance motor unit which has a large capacity obtained without increasing the radial size of the axial gap motor and which can be assembled with improved efficiency; and a dynamo-electric machine and a dynamo-electric machine device which use the motor unit. A motor unit comprises: an in-unit shaft; a stator provided along the circumferential direction of the in-unit shaft; two rotors rotating together with the in-unit shaft and provided so as to face both surfaces of the stator in the circumferential direction; and engagement sections provided to the surface of each of the rotors which is on the side opposite the stator. Such motor units are engaged with each other at the engagement sections and rotate integrally. | 12-12-2013 |