Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7952249 | Permanent-magnet type electric rotating machine and permanent-magnet type electric rotating machine system for automobile or train A rotor is deployed such that the rotor becomes coaxially rotatable with a stator. A shaft is fixed onto the axis of a rotor iron-core. 1-pole constituting magnet slots are deployed into V-character pattern along an outer circumference portion of the rotor iron-core... | 05/31/2011 |
| 7948136 | Permanent magnet motor with magnets in an adjusted position to reduce cogging torque To reduce the cogging torque of servomotors, electric power steering motors, and others, there is provided a permanent magnet motor comprising: a rotor 10 comprising a rotor yoke 11 and a plurality of permanent magnets (M1-M10); and a sta... | 05/24/2011 |
| 7714473 | Electrical machines with reduced cogging The present invention provides an electrical machine 1 with reduced cogging. The magnet poles 3 of the electrical machine are comprised of at least two separate groups of at least two circumferentially adjacent magnet poles. One of the circumferentiall... | 05/11/2010 |
| 7482724 | Ipm electric rotating machine The present invention provides a technique for enabling permanent magnets constituting the field magnet system of an IPM electric rotating machine to be embedded in a rotor core in a shallower depth. The IPM electric rotating machine is composed of a stator and a ro... | 01/27/2009 |
| 7425785 | Permanent magnet motor In a permanent magnet motor consisting of a rotor 1, which is supported on a rotating shaft 2 and has twelve permanent magnets 3 arranged at fixed intervals in the circumferential direction in the peripheral edge portion thereof, and a stator | 09/16/2008 |
| 7417346 | Permanent magnet rotating electric machine A permanent magnet rotating electric machine uses no skewing under a predetermined current and voltage condition to prevent torque from decreasing and to decrease pulsation torque to make the machine less vibrating and less noisy. The permanent magnet rotating elect... | 08/26/2008 |
| 7411329 | Permanent magnet synchronous motor including permanent magnet with tapered outer edges and rotor core with opening The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg | 08/12/2008 |
| 7408279 | Permanent magnet synchronous motor including permanent magnet with tapered outer edges The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg | 08/05/2008 |
| 7388309 | Magnetic circuit structure for rotary electric machine A rotary electric machine includes a rotor including a plurality of magnet sections arranged along a rotational direction of the rotor so that polarities of the magnet sections change alternately, and a stator including armature coils, and being disposed to confront... | 06/17/2008 |
| 7385328 | Cogging reduction in permanent magnet machines A permanent magnet motor having a rotor and a stator and configured such that when the leading edge of each pole of the rotor aligns with a stator tooth the trailing edge of that pole is generally not aligned with a stator tooth. ... | 06/10/2008 |
| 7372184 | Stator of motor A stator of a motor having various shapes and capable of minimizing the manufacturing costs. At least teeth are manufactured by the iron powder metallurgy method. In order to obtain the overhang effect, the height of a tip of each tooth is lower than the height of a... | 05/13/2008 |
| 7362025 | Internal permanent magnet rotor having improved configuration of magnetic flux barriers At each permanent magnet in a rotor of an IPM rotary electric machine, each of a pair of flux barriers respectively disposed adjoining circumferentially opposed side faces of the magnet is formed with a trench portion that extends farther from a circumferential face... | 04/22/2008 |
| 7355313 | Stator, spindle motor, and recording disk driving apparatus Spindle-motor stator includes at least a first core sheet and at least one or more second core sheets located next to an end core sheet. A bent portion bent upward and a protrusion extending upward from the bent portion are formed at the forward end of the plurality... | 04/08/2008 |
| 7321177 | Synchronous electric motor A synchronous electric motor including a rotor having a rotation axis, and a stator surrounding the rotor through a gap. The rotor includes a rotor core having an outer circumferential surface extending about the rotation axis and a plurality of permanent magnets at... | 01/22/2008 |
| 7294944 | Brushless motor A compact, highly accurate and inexpensive brushless motor is disclosed. A bearing is fixed to the inner periphery of a cylindrical portion of a housing, and a shaft is rotatably inserted through the bearing to cover the housing. A yoke arranged at the forward end o... | 11/13/2007 |
| 7284967 | Reliability-improving structure of reciprocating compressor In a reliability-improving structure of a reciprocating compressor, by minimizing vibration noise occurred in operation, adjusting a quantity of compression gas accurately, measuring an air gap in order to uniform an air gap of a reciprocating motor in an assembly p... | 10/23/2007 |
| 7276832 | Permanent magnet rotary motor There is provided a permanent magnet rotary motor in which manufacture of a stator core is facilitated. The permanent magnet rotary motor includes P rotor magnetic pole sections and N slots. In this permanent magnet rotary motor, a least common multiple LCM (P, N) i... | 10/02/2007 |
| 7271517 | Three-phase alternating current generator A three-phase alternating current generator includes a bowl-shaped flywheel, sixteen permanent magnets provided on an inner circumferential surface of the flywheel, and a stator located in the flywheel. Further, The stator is composed of twelve teeth provided opposi... | 09/18/2007 |
| 7247961 | Motor/encoder assembly for tape drives A magnetic/encoder assembly has a compact design and combines the features of motor, encoder and chuck locating feature within a single motor housing. The motor/encoder includes a DC brushless motor with an inner magnetic rotor. The motor windings and the commutatio... | 07/24/2007 |
| 7247960 | Motor/encoder assembly for tape drives A magnetic/encoder assembly has a compact design and combines the features of motor, encoder and chuck locating feature within a single motor housing. The motor/encoder includes a DC brushless motor with an inner magnetic rotor. The motor windings and the commutatio... | 07/24/2007 |
| 7233089 | Permanent magnet rotating electric machine A permanent magnet rotating electric machine uses no skewing under a predetermined current and voltage condition to prevent torque from decreasing and to decrease pulsation torque to make the machine less vibrating and less noisy. The permanent magnet rotating elect... | 06/19/2007 |
| 7230363 | Low profile generator configuration One embodiment of the invention relates to a low profile electric generator having a short axial length. A cylindrical rotor body defines an interior cavity and is coupled to a driveshaft along the axis of the cylindrical body. A first rotor assembly is coupled to t... | 06/12/2007 |
| 7218026 | Motor The objective of this invention is to provide a motor which can reduce occurrence of a torque reduction in the overload, and also lower the temperature of a motor main body immediately even in the case of a temperature rise in the motor main body. This motor ... | 05/15/2007 |
| 7218027 | High-power direct current engine comprising a collector and carbon brushes for a racing car serving as prototype A DC motor includes a rotor which is mounted in a housing so that it can rotate about an axis. The rotor includes at least one winding to which direct current is applied from the outside in alternating directions via a commutator, which is arranged on the rotor. Bru... | 05/15/2007 |
| 7187092 | Thin inner rotor motor for rotatably driving medium, and disk apparatus using the same An inner rotor motor includes a rotor having a plurality of magnetic poles circumferentially arranged, and a stator with a stator core having a plurality of magnetic pole teeth that are positioned on the outer side of the circumference of the rotor and oppose the ro... | 03/06/2007 |
| 7183684 | Permanent magnet rotary motor A permanent magnet rotary motor that can maintain higher torque density and reduce cogging torque more greatly than a conventional permanent magnet rotary motor. A pair of end surfaces of each of permanent magnets used for a rotor are substantially parallel to a vir... | 02/27/2007 |
| 7166950 | Structure of driving unit in drum type washing machine Structure of driving unit in a drum type washing machine including a tub mounted inside of a cabinet, a drum mounted inside of the tub, a shaft connected to the drum mounted inside of the tub for transmission of a driving force from a motor to the drum, a front bear... | 01/23/2007 |
| 7148597 | Permanent magnet rotating electric machine A permanent magnet rotating electric machine uses no skewing under a predetermined current and voltage condition to prevent torque from decreasing and to decrease pulsation torque to make the machine less vibrating and less noisy. The permanent magnet rotating elect... | 12/12/2006 |
| 7148598 | Spoke permanent magnet rotors for electrical machines and methods of manufacturing same A rotor assembly for an electric motor includes a spoke permanent magnet rotor and a shaft connected thereto. The spoke permanent magnet rotor has an axis of rotation, permanent magnet material, and ferro-magnetic material. The permanent magnet material extends outw... | 12/12/2006 |
| 7145272 | Motor/encoder assembly for tape drives A magnetic/encoder assembly has a compact design and combines the features of motor, encoder and chuck locating feature within a single motor housing. The motor/encoder includes a DC brushless motor with an inner magnetic rotor. The motor windings and the commutatio... | 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 |
| 7126786 | Motor/encoder assembly for tape drives A magnetic/encoder assembly has a compact design and combines the features of motor, encoder and chuck locating feature within a single motor housing. The motor/encoder includes a DC brushless motor with an inner magnetic rotor. The motor windings and the commutatio... | 10/24/2006 |
| 7122930 | Electric motor An electric motor including a stator with a plurality of coils wound around a ring-shaped iron core, and a rotor rotatably disposed inside the stator is provided. The rotor includes a rotor shaft and a yoke. The yoke is provided near its periphery with a plurality o... | 10/17/2006 |
| 7119468 | Electric motor An electric motor intended for driving transport vehicles without a reduction gear is described. The electric motor can have an annular magnetic conductor of the stator with permanent magnets located on opposite sides of the magnetic conductor, and a two-section rot... | 10/10/2006 |
| 7109623 | Motor and electrically-driven fan employing the same An electrically-driven fan 1 comprises a base portion 2; a bearing portion 11; a stator 13 including iron core portions 15 and coils 16; a rotor 4 including a rotary shaft 20 and a cylindrical magnet 22;... | 09/19/2006 |
| 7109624 | Synchronous electric machine A synchronous electric machine includes a stator and a rotor. The stator is provided with teeth, which are wound around to establish electromagnetic fields. The rotor is provided with permanent magnets to generate magnetic fields, so that the rotor can rotate by int... | 09/19/2006 |
| 7105971 | Permanent-magnet rotor for an inner rotor type electric rotary machine and magnet-saving type rotor for a synchronous motor A total of three permanent magnets, installed in a rotor core closely to an outer cylindrical surface of the rotor core, are disposed at predetermined angular pitches in the circumferential direction of the rotor core. All of the permanent magnets are magnetized in ... | 09/12/2006 |
| 7105970 | Cored motor A cored motor includes a rotor (21), having a rotor hub (2), a shaft (1) fixed to the rotor hub (2), a rotor yoke (5) in ring shape and a ring magnet (6) fixed to an inner circumferential surface of the rotor yoke (5)... | 09/12/2006 |
| 7102263 | Permanent magnet type rotor and permanent magnet type rotary electrical machine A number of embodiments of rotating electrical machines using permanent magnets wherein the cogging torque is substantially reduced as are vibrations caused by magnetic flux variations. This is accomplished by disposing the coil windings in equal circumferential spa... | 09/05/2006 |
| 7095193 | Brushless DC motors with remote Hall sensing and methods of making the same A brushless DC motor apparatus includes a housing and a stator assembly coupled to the housing. The apparatus further includes a magnetic rotor assembly rotatably coupled to the housing. The magnetic rotor assembly is configured to rotate within the housing in respo... | 08/22/2006 |
