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| Number | Title | Issue Date |
| 7990010 | Small motor of polygonal external shape A side wall of a motor casing is formed into a polygonal shape such that flat side portions and corner portions located at respective corners between the side portions are continuously joined together. A field magnet, which has an outer circumferential shape approxi... | 08/02/2011 |
| 7440689 | Electromagnetically actuated adjusting apparatus for lens An electromagnetically actuated adjusting apparatus for lens is disclosed. The adjusting apparatus comprises a body capable of furnishing a lens inside, at least one permanent magnet, a first magnetic conductor and a second magnetic conductor. The first and the seco... | 10/21/2008 |
| 7427817 | Small-sized motor having polygonal outer shape A small-sized motor having a polygonal outer shape includes four or more field magnets attached to the inner surface of a motor casing made of metal. A tubular portion of the motor casing is formed into a polygonal tubular shape such that flat side portions equal in... | 09/23/2008 |
| 7423405 | Electromagnetic rotating machine In order to obtain an electromagnetic rotating machine of lightweight and high energy efficiency, which produces big torque for rotating a large-diameter fan, a coil A and coil B as excitation coils are disposed on an inner peripheral surface of a fan casing so as t... | 09/09/2008 |
| 7356906 | Brushless direct-current motor of radial core type having a structure of double rotors and method for making the same A method of manufacturing a radial core type double rotor brushless direct-current motor is provided. A double rotor structure is employed with inner and outer rotors which are doubly disposed such that a stator core is completely divided. A rotational shaft is rota... | 04/15/2008 |
| 7211917 | Motor with a magnet fixed on the inner peripheral face of a circumferential wall A motor includes a circumferential wall part of a case provided with an opening part on one end side in an axial direction and at least a magnet fixed to the inner peripheral face of the circumferential wall part. At least a part of the outer peripheral face of the ... | 05/01/2007 |
| 7159295 | Method of making a miniature electric motor A miniature PMDC motor 10 has a permanent magnet stator comprising two arcuate ceramic magnets 20 fitted to a can-like housing 11 and circumferentially separated by interdisposed rubber magnets 21 wedging or nipping the ceramic magnets | 01/09/2007 |
| 7098564 | Work piece A work piece according to the invention has caulking tabs that are connected to each other by means of a bridge piece. As a result, the caulking tabs are lengthened, thus permitting better control of the caulking process because the caulking tabs overlap a component... | 08/29/2006 |
| 7091642 | Field assembly for a motor and method of making same A cylinder/magnet assembly for a field of an electric machine, such as a stator of a brush type motor or a rotor of a brushless motor, alternator or generator, is formed by stamping a blank to form anchors extending upwardly from a surface of the blank and stamping ... | 08/15/2006 |
| 7038343 | Field assembly for a motor and method of making same A cylindrical magnet ring assembly having a cylinder magnet flux ring (102) formed with a plurality of inwardly projecting anchors (108); a plurality of permanent magnets (104), wherein the magnet can be formed with step portions (112) in... | 05/02/2006 |
| 7030530 | Permanent magnet element and electric machine A permanent magnet element intended especially for electrotechnical devices and an electric machine, the element (1) comprising at least one permanent magnet piece (10). The permanent magnet element (1) also comprises a protective cover (11 | 04/18/2006 |
| 6982511 | Pole ring A pole ring suitable for d.c. motors is provided. The pole ring includes several retaining projections provided at the outer circumference for the secure retainment in a motor housing. The retaining projections have retaining surfaces pointing oppositely to the moun... | 01/03/2006 |
| 6891297 | Electrical-steel-sheet formed body for rotor core, rotor, rotary electric machine and related method An electrical-steel-sheet formed body is provided with an opening portion into which a permanent magnet is inserted, and an outer-peripheral hardened portion formed on the electrical-steel-sheet formed body at an outer periphery side thereof for the opening portion ... | 05/10/2005 |
| 6831387 | Rotating electrical machine with permanent magnets and method of making same An improved rotating electrical machine having permanent magnets and method for attaching the magnets that permits the use of thin, high flux density materials. The magnets and their mounting plate have facing cylindrical surfaces that are spaced slightly apart and ... | 12/14/2004 |
| 6812608 | Direct current motor having field magnets formed by injection molding synthetic resin, with which magnetic particles are mixed, to the inner periphery of the stator core Field magnets are attached to an inner periphery of a stator core, which defines a rotor through hole. The stator core has a plurality of recesses open to the rotor through hole. Each recess faces magnet end portions of the field magnets. The recess surface of the r... | 11/02/2004 |
| 6806607 | Electric motor A miniature PMDC motor 10 has a permanent magnet stator comprising two arcuate ceramic magnets 20 fitted to a can-like housing 11 and circumferentially separated by interdisposed rubber magnets 21 wedging or nipping the ceramic magnets | 10/19/2004 |
| 6794782 | Shackle spring A fastening spring for fastening at least one component accommodated in a housing of an electric motor, in the prior art, has a bending zone which is exposed to strong mechanical stresses. A fastening spring (1, 1′) of the invention has at least a se... | 09/21/2004 |
| 6750579 | Permanent magnet motor flux rings A power tool includes a motor with a flux ring. The flux ring includes a ring member with a first and second end. The ends are positioned with respect to one another such that the ends move towards and away from one another during compressing and expanding of the ri... | 06/15/2004 |
| 6737780 | Electric motor magnetic flux path structure An electric motor 10 has an armature 12 including windings 14. The armature is constructed and arranged to rotate a shaft 16. The motor includes a commutator 18 and a brush card assembly 20 having brushes to engage the commu... | 05/18/2004 |
| 6700269 | Direct current motor yoke housing having groove-like reduced thickness portions A yoke housing that receives an armature has a plurality of permanent magnets (primary magnetic poles) secured to an inner peripheral surface of the yoke housing. Furthermore, the yoke housing includes a plurality of groove-like reduced thickness portions... | 03/02/2004 |
| 6522042 | Anchoring system for injection molded magnets on a flux ring or motor housing A power tool includes a flux ring with an annular member. At least one molded magnet is received on the annular member. An anchor is on the annular member to retain the at least one magnet on the annular member. The anchor is unitarily formed with the ann... | 02/18/2003 |
| 4843268 | Asymmetric field electromagnetic motor The present invention includes an electromagnetic motor having an asymmetric field stator. An aluminum rotor 6 includes a gorup 26 of permanent magnets that occupy a 153° segment of the rotor 6 and are counterbalanced mechanically by brass counterweights... | 06/27/1989 |
| 4793054 | Alignment system for permanent magnet motors A permanent magnet motor for use in such electrically-powered devices as appliances, power tools, and the like includes a longitudinally-split cylindrical ferromagnetic wrapper having an inner diameter normally less in its free state than the outer cross-... | 12/27/1988 |
| 4334163 | DC Electric motors A DC electric motor comprising a tubular support carrying spaced bearings, a shaft journalled in said bearings for coaxial rotation within said support and having a driven end portion extending from a first end length of said tubular support, a rotor comp... | 06/08/1982 |
| 4323806 | Miniature rotary electric machine The present invention relates to a miniature rotary electric machine and more particularly to a coreless type of rotary electric machine. The coreless rotary electric machine includes a rotor coil formed as a coil body in a form of cup with its one end be... | 04/06/1982 |
| 4208784 | Method for placing and securing magnets in a motor housing An improved technique for the assembly of motors of the type having a printed armature that rotates in a flat, annular air gap between a magnet assembly and a magnetic flux plate, wherein the size of the air gap is accurately maintained at preselected val... | 06/24/1980 |
| 4209724 | Permanent magnet stator frame structure for an electric motor An electric motor comprising a rotor and a stator which comprises two magnetic blocks fixed in confronting relation on a frame of iron or magnetic sheet. The blocks are respectively fixed on two support elements which are interconnected by two covers of i... | 06/24/1980 |
| 4131989 | Method of manufacturing an electric motor An electric motor comprising a rotor and a stator which comprises two magnetic blocks fixed in confronting relation on a frame of iron or magnetic sheet. The blocks are respectively fixed on two support elements which are interconnected by two covers of i... | 01/02/1979 |
