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| Number | Title | Issue Date |
| 8138648 | Permanent magnet electric motor A motor comprises a stator and a rotor (20) disposed within the stator. The stator comprises: a housing (31) having a polygon cross section that comprises a plurality of side portions (32a-32d) and a plurality of curved corn... | 03/20/2012 |
| 7800270 | Small DC motor A small DC motor includes: a motor frame including a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that includes four sides and connecting portions, each of the connecting portions connecting adjacent ... | 09/21/2010 |
| 7732962 | Small DC motor A small DC motor includes: a motor frame including a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that includes four sides and connecting portions, each of the connecting portions connecting adjacent ... | 06/08/2010 |
| 7638914 | Permanent magnet bonding construction Bonding geometries are disclosed between permanent magnets and steel portions of magnetic assemblies. When employed in permanent magnet motors, this particular bonding construction reduces or even eliminates the loosening of permanent magnets inside of electric moto... | 12/29/2009 |
| 7498706 | Small DC motor A small DC motor includes: a motor frame including a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that includes four sides and connecting portions, each of the connecting portions connecting adjacent ... | 03/03/2009 |
| 7385330 | Permanent-magnet switched-flux machine A permanent-magnet switched-flux (PMSF) apparatus comprises a plurality of permanent-magnet switched-flux (PMSF) devices, wherein each of the plurality of PMSF devices comprises a ferromagnetic outer rotor coupled to a shaft, wherein the ferromagnetic outer rotor co... | 06/10/2008 |
| 7375447 | Power tool A power tool includes: a stator having a substantially cylindrical yoke and a plurality of permanent magnets that are firmly fixed to an inner surface of the yoke and circumferentially spaced from each other by a first gap; a rotor inserted inside the permanent magn... | 05/20/2008 |
| 7368843 | Commutator motor A commutator motor includes a stator and a rotor, and the stator includes a stator yoke and a field magnet. The field magnet is fixed onto the inner peripheral surface of the substantially cylindrical stator yoke. The stator yoke is configured by coaxially stacking ... | 05/06/2008 |
| 7364174 | Magnetic motor axle for skateboards A magnetic motor axle for magnetically augmenting the propulsion efficiency and duration of a skateboard is disclosed. The magnetic motor axle includes a truck for mounting on a step board of a skateboard. Multiple truck magnets are provided in the truck. An elongat... | 04/29/2008 |
| 7339299 | Electric actuator and motor used therein A motor comprises a rotor fixed to a shaft and a stator comprising a permanent magnet on the inner circumferential surface of a motor casing. The shaft extends from the opening end of the motor casing and has a worm wheel in a gear casing. The end face of the gear c... | 03/04/2008 |
| 7285889 | Pulsed-inertial electric motor The invention relates to electric motors, particularly to low-voltage gearless commutator motors, and can be used as motor-wheels in transportation vehicles and in other technologies. The aim of the present invention is to provide an electric motor with increased pe... | 10/23/2007 |
| 7170202 | Linear motor In a linear motor according to this invention, the field permanent magnets 2 are arranged at an equal pitch around a field iron core 1 so that the poles are alternately changed. Also, an armature 3a on the needle side is arranged opposite... | 01/30/2007 |
| 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 |
| 7032291 | Method of manufacturing stator winding of rotary electric machine A method of manufacturing a stator winding includes a twisting step of U-shaped conductor segments having a pair of straight portions by moving the straight portions in the circumferential direction while restraining the turn portions of the U-shaped conductor segme... | 04/25/2006 |
| 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 |
| 7030524 | Motor for driving blower fan A reinforcing ring (22) includes a ring portion (23) and a cylinder portion (24) is press fitted on a portion which is slightly shifted toward the rear end side from portions on which stators (2) are fixed on parts of a case body (1 | 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 |
| 6974522 | Method and apparatus for mounting a plurality of magnet segments on a back ring A method and apparatus for assembling permanent magnet segments and a back ring wherein a fixture holds segments in circumaxially spaced relationship, adhesive is applied to the segments, externally from pressure sensitive adhesive tape and the fixture then expands ... | 12/13/2005 |
| 6975054 | Electric motor An electric motor includes a stator which carries permanent magnets, and a rotor which carries electromagnets. A particular arrangement of connecting up the windings of the electromagnets to the distributing collector and the selection of the ratio of stator magnets... | 12/13/2005 |
| 6938323 | Method of manufacturing stator coil of rotary electric machine A stator coil of a rotary electric machine such as an alternator for use in an automobile is composed of a plurality of U-shaped conductor segments inserted into slots formed in a stator core. Each segment has a head portion and two legs extending from the head port... | 09/06/2005 |
| 6910257 | Production method of a sequentially joined-segment stator coil of a rotary electrical machine A production method of a polyphase sequentially joined-segment coil of a rotary electric machine and a product produced by the same are provided. A production machine includes pairs of tines working to catch heads of conductor segments when they are twisted using ri... | 06/28/2005 |
| 6891296 | Magnetizing structure of motor The present invention provides a structure for magnetizing a rotor magnet of a motor, which includes a rotor having a magnet cylinder with a wavy curve surface and a stator having a plurality of silicon steel sheets wound by a plurality of winding coils. The present... | 05/10/2005 |
| 6873235 | Shear force levitator and levitated ring energy storage device One or more permanent magnets, or one or more permanent magnet arrays are used to produce shear force levitation. A primary application of shear force levitators is a levitated ring energy storage device. Such a levitated ring energy storage device includes a round ... | 03/29/2005 |
| 6867523 | Brush motor A brush motor has a magnetic sensor provided for detecting a change in a field magnet occurring in correspondence with a change in a rotational position of a rotor core. ... | 03/15/2005 |
| 6864608 | Brushless generator with permanent magnets Disclosed is a brushless generator with permanent magnets, which provides high-speed operation, simple maintenance, lightweight, and stable power. The brushless generator with permanent magnets including a main generator with a stator and a rotor; and an auxiliary g... | 03/08/2005 |
| 6822368 | Rotary permanent magnet electric motor having stator pole shoes of varying dimensions Rotary permanent magnet motors have salient stator poles with nonuniform pole thickness in the radial direction for compensating effects of cogging torque. Pole base portions terminate at pole shoes at the radial air gap. The pole shoes extend in the circumferential... | 11/23/2004 |
| 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 |
| 6787945 | Linear motor In order to precisely install a permanent magnet linear motor on a machine tool without being influenced by magnetic fields, a stator is provided with a magnet support which extends in parallel with the lengthwise direction of the linear motor and whose cross sectio... | 09/07/2004 |
| 6710493 | Dynamo-electric machine having tapered magnets secured to yoke A rotor and each magnet are configured to satisfy one of the following conditions: (Dπ/Z)Xn+T | 03/23/2004 |
| 6707209 | Reduced cogging torque permanent magnet electric machine with rotor having offset sections A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and th... | 03/16/2004 |
| 6707212 | Electrical machine The present invention relates to an electrical machine which has one or several stators (2) edified by one or several statorpackages (21) that consists of one or several statorsections (22). The core (23) of the statorpackage is arranged ... | 03/16/2004 |
| 6703753 | Motor core and motor using the same A motor generating cogging torque has one-quarter the cycle of basic cogging torque and an extremely small absolute value. First, in order to reduce the cycle of the cogging torque to one-half the cycle of the basic cogging torque, a basic configuration o... | 03/09/2004 |
| 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 |
| 6675460 | Method of making a powder metal rotor for a synchronous reluctance machine A method of making a composite powder metal disk for a rotor assembly in a synchronous reluctance machine. The method includes filling discrete regions of a disk-shaped die with ferromagnetic and non-ferromagnetic powder metals, compacting to powders, and... | 01/13/2004 |
| 6661131 | Motor and apparatus using the same motor A motor has plural through-holes punched in a top surface of its frame. A cap made of magnetic material is placed at a location on a stator which corresponds to the through-holes, and the cap is spaced axially from the through holes. An attracting magnet ... | 12/09/2003 |
| 6657337 | Direct current electric motors, in particular for motor vehicle actuators An electric motor for motor vehicle actuators include a rotor provided with a coil having first and second radial ends and rotatingly mounted in a hollow frame of two parts directly mounted on each other and having end walls, the two parts are made of goo... | 12/02/2003 |
| 6616421 | Direct drive compressor assembly A centrifugal compressor assembly, especially one having two or more stages, comprises a first compressor casing having. A fluid inlet and a fluid outlet and a first impeller rotatable within the first compressor casing. The assembly further comprises a s... | 09/09/2003 |
| 6522041 | 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 expandin... | 02/18/2003 |
| 6496002 | Rotation detector having a plurality of magnetism detection elements, a plurality of magnetic resistors which are able to switch the resistance from great to small and vice-versa A rotation detector includes a rotor having a shaft. Projections are located at predetermined intervals on the periphery of the rotor and extend in an axial direction. Magnets are located between the projections and the shaft. The flux of each magnet is d... | 12/17/2002 |
| 6437472 | Apparatus for wireless transfer of power to a rotating element A magnetic induction device having at least one secondary induction assembly including a secondary winding is mounted on a rotary element. A magnetic flux is induced the secondary induction assembly, causing an induced secondary alternating current in the... | 08/20/2002 |
