Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8053942 | Axial gap motor The present axial gap motor is provided with: a rotor that is rotatable around a rotation axis; and a pair of stators that are opposed to each other with the rotor interposed therebetween from both sides in a rotation axis direction which is parallel with the rotati... | 11/08/2011 |
| 8040011 | Generator and magnetic flux conducting unit The invention relates to a generator, to a magnetic flux conducting unit for a generator, and to a power generation machine comprising such a generator. In an embodiment of the invention, a generator is disclosed which comprises at least one coil assembly and at lea... | 10/18/2011 |
| 7906883 | Axial gap motor A rotor includes a rotor frame having a plurality of ribs which are disposed at predetermined intervals in a circumferential direction and which extend in a radial direction, and a shaft portion and a rim portion which are provided at inside diameter sides and outsi... | 03/15/2011 |
| 7385321 | Motor having shifted teeth of pressed powder construction A multi-polar rotary machine comprises a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween. The stator has two spaced stator elements and a ring shaped permanent magnet held between the stator elements and magnetized so... | 06/10/2008 |
| 7339292 | Motor having shifted teeth of pressed powder construction A multi-polar rotary machine comprises a and a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween. The stator has two splitted stator elements and a ring shaped permanent magnet held between the stator elements and magne... | 03/04/2008 |
| 7145278 | Permanent magnet type three-phase stepping motor A permanent magnet type three-phase stepping motor that is simple in construction, with reduced vibration, a reduced unbalanced force in the radial direction, and high torque that can be manufactured at a low cost. The permanent magnet type three-phase stepping moto... | 12/05/2006 |
| 7141905 | Permanent magnet synchronous machine A permanent magnet synchronous machine includes a stator, and a rotor which defines with the stator an air gap. The stator includes a plurality of teeth which are disposed in spaced-apart circumferential relationship and separated from one another by a tooth pitch. ... | 11/28/2006 |
| 6960847 | Electromagnetic actuator and composite electromagnetic actuator apparatus An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been... | 11/01/2005 |
| 6958556 | Structure of rotors in stepping motors A stepping motor having a rotor that includes a magnetic component whose circumferential part is magnetized in multipole along the circumferential surface thereof, the stepping motor being capable of forcing the rotor to rotate by magnetic force provided between mag... | 10/25/2005 |
| 6952068 | Fabricated components of transverse flux electric motors Transverse flux electric motors are made using a unique process where individual components are premade and then assembled together. A stator portion is made by nesting a coil between two stator core portions. The stator core portions are made from laminations or si... | 10/04/2005 |
| 6940200 | Electric drive The invention refers to magnetoelectric machines and comprises a rotor made in the form of at least two disks, the magnetized disks have circumferential arrayed like poles and an axially magnetized polygon or cylindrical magnet placed between the disks. The stator c... | 09/06/2005 |
| 6930423 | Rotation angle detector According to the present invention, when using a pair of annular stators stacked together, they are deviated from each other so that the projected poles may not overlap each other, whereby continuous winding is possible for each winding. Thus, a reduction in cost is... | 08/16/2005 |
| 6903476 | Permanent magnet type three-phase stepping motor A permanent magnet type three-phase stepping motor that is simple in construction, with vibration, a reduced unbalance force in the radial direction, and high torque that can be manufactured at a low cost is disclosed. The permanent magnet type three-phase stepping ... | 06/07/2005 |
| 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 |
| 6882066 | Unipolar transverse flux machine In a unipolar transverse flux machine, in particular a motor, having a rotor, which is comprised of two coaxial, ferromagnetic, toothed rotor rings, and a permanent magnet ring, which is magnetized in an axially unipolar fashion and is clamped axially between these ... | 04/19/2005 |
| 6515390 | Electric drive apparatus with a rotor having two magnetizied disks The invention refers to magnetoelectric machines. It can be used when manufacturing different-purpose electric drives--for instance, in fans, compressors, electromobile's wheels, and so forth. It comprises a rotor made in the form of two disks, the teeth ... | 02/04/2003 |
| 6323572 | Magnet type electric motor and generator To obtain the magnetic flux increase of the air gap, a radial slit for inserting a magnet is provided in a respective pole iron core, and the length of the magnet is adjusted to a radial direction and to an axial direction. In particular, when it is desir... | 11/27/2001 |
| 6043574 | Two-phase motor, particularly a time piece motor or a motor for driving the hand of a display A two-phase motor formed by a stator part excited by electric coils and a magnetized rotor. The rotor has N pairs of poles which are radially magnetized in alternate directions, N being equal to 3 or 5. The stator part has at least two W-shaped circuits c... | 03/28/2000 |
| 5952758 | Rotating electrical machine with excitation coils, by magnets or with double excitation A rotating electrical machine including a rotor (2), the magnetic circuit of which carries excitation members, and a stator (16), the magnetic circuit of which carries a stator coil. The magnetic circuit of the rotor includes a shaft (1) on which are moun... | 09/14/1999 |
| 5763972 | Magnetic bearing with alternating actuators and sensors A magnetic bearing for magnetic centering of a rotor relative to a stator relative to two radial centering axes includes actuators operating relative to centering axes and speed sensors having sensing axes coplanar with the centering axes. The rotor inclu... | 06/09/1998 |
| 5708310 | Permanent magnet type stepping motor A permanent magnet type stepping motor wherein and that at least one pitch formed by two adjacent small pole teeth of each of stator magnetic poles is different from other pitch formed by other two adjacent small pole teeth of each of the stator magnetic ... | 01/13/1998 |
| 5552653 | Electric motor with increased T/N characteristic value In an electric motor, in order to simplify the structure and to remarkably improve the T/N characteristic value, yoke plates mounted on a field magnet are so shaped that the total magnetic flux of the field magnet is collectively extended to the iron core... | 09/03/1996 |
| 5545938 | Doubly salient reluctance machines The present invention relates to doubly salient reluctance machines (DSRMs) including switched reluctance machines, stepping motors and hybrid stepping motors. To improve the utilization of the machine windings and associated electronic circuits the windi... | 08/13/1996 |
| 5436518 | Motive power generating device A motive power generating device comprises a permanent magnet disposed around a rotational output shaft for rotation therewith, the output shaft being mounted on a support member for rotation, a magnetic body disposed in concentric relationship with the p... | 07/25/1995 |
| 5317227 | Rotor with hollow cylindrical permanent magnet A rotor for a dynamoelectric machine, without windings and rotatable about a central longitudinal axis, having an axially extending rotatable body and a toroidal magnet coaxially mounted on the body is constructed to provide magnetic exitation for the rot... | 05/31/1994 |
| 5130595 | Multiple magnetic paths machine Separate multiple flux paths for an electrical generator or motor are provided in a single rotor machine by axially mounting a plurality of pole pieces on the rotor shaft. Each pole piece includes a central disc portion having a plurality of radial pole-f... | 07/14/1992 |
| 5111098 | Unitary rotational speed sensor Four embodiments of a reluctance type rotational speed sensor are disclosed. In the first embodiment, an annular magnet circumscribes a sensing coil having a unitary rotor nested within it, and is disposed between two elements which comprise the stator. I... | 05/05/1992 |
| 4998034 | Low speed high torque motor with production method A cylindrical field system of a low speed high torque motor is divided in an axial direction into first and second field system portions, these two field system portions are connected by a connecting member and a field magnet is disposed between the field... | 03/05/1991 |
| 4739201 | Means to reduce harmonic torque in electromagnetic machines An electromagnetic machine of the type having a moving member and a stationary member, with a set of structures on the moving member to magnetically interact with a set of structures on the stationary member, has an improved construction comprising displa... | 04/19/1988 |
| 4733120 | Flat type stepping motor A flat type stepping motor used mainly for driving an ultra small size floppy disk is disclosed. According to the invention, a rotor yoke holder holding a pair of yokes on the rotor unit is secured to the end of a rotary shaft, while a stator unit is disp... | 03/22/1988 |
| 4675564 | Permanent magnet type stepping motor A permanent magnet type stepping motor wherein number of magnetic poles provided radially on the inside periphery of a stator is 16, number of pole teeth provided on a rotor poles is (z) (wherein z=16 m&#b1;4; (m) denotes a positive integer), 14 poles amo... | 06/23/1987 |
| 4584495 | Performance step motor The invention is an improved performance step motor (10) including a shorted turn mechanism in the nature of a conducting ring (32) or one or more closed loop conductive strands (50) circumferentially disposed about a ring-shaped exposed magnet zone (48) ... | 04/22/1986 |
| 4528473 | Permanent magnet type step motor A permanent magnet type step motor comprising a rotor wherein a disc-like permanent magnet having a magnetic pole in an axial direction and a pair of rotor yokes holding the permanent magnet therebetween are integrally and coaxially mounted on a rotationa... | 07/09/1985 |
| 4516048 | Stator with nonuniformly spaced teeth for rotating electromagnetic device An electromagnetic device of the type having a rotor and a stator with magnetically coacting peripheries, with the stator having toothed pole structures, has the stator pole teeth set at nonuniform spacing to improve the operating characteristics of the d... | 05/07/1985 |
| 4503368 | Permanent magnet type stepping motor A permanent magnet type stepping motor wherein magnetic poles of a stator core consisting of a cylindrical yoke, a plurality of magnetic poles provided radially around the inside of the cylindrical yoke, and pole teeth formed on the tips of the magnetic p... | 03/05/1985 |
| 4406958 | Stepping motors with disc magnet The rotor in each of the disclosed stepping motors comprises a permanent magnet disc between toothed pole pieces, the diameter of the magnet disc is essentially equal to the outer diameter of the toothed pole pieces.... | 09/27/1983 |
| 4347457 | Permanent magnet type stepping motor A circular-plate permanent magnet, with its one side being magnetized as N-pole while the other as S-pole, which is sandwiched between two rotor yokes made of a magnetic circular plate, is mounted on a rotor shaft as one unit, and this unit makes up the r... | 08/31/1982 |
| 4334160 | Rotating electrical machine A rotating electrical machine having a self-supporting, ironless stator assembly.... | 06/08/1982 |
| 4306164 | Pulse motor A pulse or stepping motor with a stator assembly and a rotor assembly has been found. The stator assembly comprises a cylindrical housing of ferromagnetic material, the first, second, third, and fourth ring shaped stators secured in said housing with some... | 12/15/1981 |
| 4234808 | Stepping motor A stepping motor of the homopolar design with a step angle of 3.6° and having a generally cubic form is disclosed. The motor includes a generally square, single-section laminated stator which has only four stator poles extending radially inwardly from th... | 11/18/1980 |
