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| Number | Title | Issue Date |
| 7531932 | Power generating system A small power generating system includes a turbine driven by a fluid, a small high-speed rotation power generator including a permanent magnet rotor having a permanent magnet and rotated together with the turbine and a plurality of stator coils each of which is comp... | 05/12/2009 |
| 7514833 | Axial gap permanent-magnet machine with reluctance poles and PM element covers An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring ( | 04/07/2009 |
| 7291945 | AC motor and control device therefor A rotor, which is rotatable about a rotor shaft, comprises N poles and S poles alternately disposed in the circumferential direction, and rotor-side neutral poles disposed adjacent to the N poles and the S poles along the axial direction of the rotor, being magnetic... | 11/06/2007 |
| 7239058 | Rotor-stator structure for electrodynamic machines A rotor-stator structure for electrodynamic machinery is disclosed to, among other things, minimize magnetic flux path lengths and to eliminate back-iron for increasing torque and/or efficiency per unit size (or unit weight) and for reducing manufacturing costs. In ... | 07/03/2007 |
| 7157829 | Axial flux permanent magnet generator/motor The present invention is related to a permanent magnet electrical generator/motor comprising a stator, a rotor, a rotational axis and an air gap between stator and rotor so that the magnetic flux across said air gap is essentially oriented along said rotational axis... | 01/02/2007 |
| 7061151 | Supporting device of rotor A supporting device of a rotor includes a ceramic axial tube fixed on the rotor, and a ceramic axial support rotationally supporting the ceramic axial tube, wherein the spacing between the ceramic axial tube and the ceramic axial support is within the range of 2–2... | 06/13/2006 |
| 7023119 | Device comprising a plain bearing A motor, suitable for driving a fan, features a plain bearing (36) that contains ferromagnetic material and serves for radial support of a rotor shaft (34) made of ferromagnetic material. The shaft (34) is arranged rotatably and axially displace... | 04/04/2006 |
| 6891295 | Flywheel magneto generator A flywheel magneto generator which comprises a rotor having a magnet attached to an outer circumferential side of a flywheel and a stator constructed by winding a generating coil around a core having a magnetic pole portion opposed to a magnetic pole of the rotor, w... | 05/10/2005 |
| 6873085 | Brushless motor A brushless motor with a rotor having a magnet and a magnetic return, the magnet and magnetic return being arranged to form a gap therebetween, and a stator having a coil disposed in the gap. ... | 03/29/2005 |
| 6864613 | Armature for an electromotive device An inductive coil for an electromotive device includes a pair of concentric conductive sheet metal winding portions each comprising a plurality of axially extending conductive bands each being separated from an adjacent conductive band by a space, each of the conduc... | 03/08/2005 |
| 6774512 | Claw-pole permanent-magnet stepping motor A claw-pole permanent-magnet stepping motor includes a pair of cases containing two or more inductors in symmetrical arrangement with multiple claw poles. The case unit has an oval shape having thin flat side walls or thin stepped side walls and connecting thick arc... | 08/10/2004 |
| 6509663 | Stepping motor A stepping motor comprises a stator (3) with at least two magnetic circuits and a rotor (2) that is rotatably mounted on the stator through a single ball bearing having four contact points. The rotor comprises a mutipolar magnet (5) essentially in the for... | 01/21/2003 |
| 6455969 | Multiple layer double rotor single stator skew symmetry permanent magnet rotating motor A single-stator-double-rotor rotating motor has one upper-layer rotor, one intermediate-layer armature and one lower-layer rotor. The upper-layer rotor and lower-layer rotor are embedded with the same number of magnets to form a magneto type magnetic pole... | 09/24/2002 |
| 6265802 | Laminated rotor assembly and method for a dynamoelectric machine A rotor assembly and method for a dynamoelectric machine includes a shaft having an outer circumferential surface defining a shaft diameter. The rotor assembly also includes a plurality of laminations, wherein each lamination has a central opening definin... | 07/24/2001 |
| 5825106 | Bi-directional biphase electromechanic transducer having multipolor magnets An electromecanic transducer comprises a stator 4 formed of three parts 6, 8 and 18 each presenting merlons or teeth 52, 54 and 60 superposed to a multipolar magnet 34 of rotor 30. Three statoric magnetic poles 10, 12 and 20 are situated in a same statori... | 10/20/1998 |
| 5796193 | Disk driving motor A rotor is formed by a rotary frame 3 composed of a nonmagnetic material, a field magnet 5, a yoke 4 and an auxiliary yoke 7. A disk 12 is mounted on the rotary frame 3. An opening 4b is formed in the yoke 4 to thereby cause attractive magnetic flux from ... | 08/18/1998 |
| 5631508 | Cost-saving, small-sized motor with improved stability over wide speed range A motor including a rotor member having a symmetric shape relative to a shaft to which the rotor member is being fixed. An annular magnet assembly is fixed to the rotor member with the shaft passed therethrough at a center thereof. The magnet assembly is ... | 05/20/1997 |
| 5392176 | Recording/reproducing device employing device housing and printed circuit board and electronics as structural and functional part of media drive motor and the media drive motor A disk drive in which the disk spindle motor for a rotatable recording/reproducing media has a printed circuit stator winding on a printed circuit board within the disk drive housing, fitted between axially spaced circular flanges of a bobbin-shaped motor... | 02/21/1995 |
| 5216310 | Axial flux electromagnetic micromotors An axial flux electromagnetic micromotor is described. The micromotor has a stator, a rotor which is pivotally mounted in relation to the stator about an axis of rotation, the rotor having at least one pair of magnetic poles producing in an air gap a magn... | 06/01/1993 |
| 5146144 | Electric motor An electric motor is disclosed which is of the brushless D.C. type and comprises a generally planar rotor and a generally planar stator. The rotor is a multipolar permanent magnet, and the stator includes a planar coil having a plurality of windings. In o... | 09/08/1992 |
| 4980590 | Flat brushless motor with a back-yoke formed as an eccentric weight to induce vibrations A flat brushless motor utilizable as a warning means in a portable communication device such as a pocket bell. The flat brushless motor is such that the center of gravity of the back-yoke (5a) is displaced from the center of rotation so that, by the rotat... | 12/25/1990 |
| 4839551 | Brushless motor structure enabling accurate relative positioning of rotor and stator coils A brushless motor is disclosed having a plurality of stator coils disposed circumferentially around a rotatable shaft and a rotor magnet supported to a yoke fixed to the rotatable shaft and opposed to the stator coils. A radial bearing, for radially suppo... | 06/13/1989 |
| 4394594 | Motor with a disk rotor Slow-running brushless d.c. motors with a disk rotor, a flat air gap and an iron-free stator winding made up of a number of coils are particularly suitable for direct drive of sound recording and reproducing equipment at a highly steady and controlled spe... | 07/19/1983 |
| 4361776 | Coil assembly for flat brushless motor A coil assembly for a flat brushless motor comprises a coil of wire, and a bobbin including a flangeless plate-like portion having a peripheral surface on which the coil is wound with the axis of the coil being normal to opposed major surfaces of the plat... | 11/30/1982 |
| 4329604 | Low loss brushless DC motor A printed circuit motor is constructed with the printed circuit windings stationary, and therefore constituting the stator of the motor. The stator is mounted at the end of a heavy hollow supporting frame member. The rotor is mounted on the end of a shaft... | 05/11/1982 |
| 4181867 | Brushless direct-current motor An external-rotor brushless direct-current motor has a pair of rotor plates spaced axially apart and connected together for joint rotation about an upright axis. One of these plates carries an annular multipolar axially polarized magnet. A fixed stator pl... | 01/01/1980 |
| 4125792 | Brushless D-C motor A preferably axial air gap motor has coreless armature stator windings and a permanent magnet rotor. Sensors, such as Hall generators, are provided to sense the rotary position of the rotor and control switching of current to the respective armature windi... | 11/14/1978 |
| 4011475 | Torque equalized brushless permanent magnet rotor motor To provide for even running and uniform torque output of pulse-energized motors, elements having soft-iron characteristics are located outside of the air gap, but within the stray, or leakage field emanating from the poles of a permanent magnet rotor, the... | 03/08/1977 |
| 4007390 | Brushless D-C motor In the case of a collector-less D-C motor designed as a disc motor with an external rotor, the permanently magnetized external rotor is supported in an axially space-saving manner in a bearing tube attached to the stator bedplate. For the purpose of facil... | 02/08/1977 |
