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| Number | Title | Issue Date |
| 7327060 | Bearing assembly having a mechanical component and using attractive magnetic forces A magnetic bearing assembly, either radial or linear, utilizes attractive magnetic forces between inner and outer components of the assembly. The assembly includes a mechanical device for controlling relative movement between the components in first and second direc... | 02/05/2008 |
| 7288860 | Magnetic transducer with ferrofluid end bearings An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between... | 10/30/2007 |
| 7235909 | Electromagnetic motor/generator In some embodiments, an electromagnetic motor/generator may include one or more of the following features: (a) a frame, (b) a magnetic section having an upper magnet, a lower magnet, and a center magnet, coupled to the frame, and (c) at least one solenoid coupled to... | 06/26/2007 |
| 7213579 | Fuel pump and method of manufacturing an armature for the fuel pump An axial length of the fuel pump is reduced, and the fuel pump is miniaturized, without reducing pumping performance. A space G is formed between coils 19 and the shaft 7 at the upper side of the core 11, and the lower portion of the comm... | 05/08/2007 |
| 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 |
| 7116027 | Magnet for a dynamo-electric machine A magnet for a dynamo-electric machine has a plurality of magnetic poles disposed substantially in a circular shape and opposite a plurality of teeth disposed substantially in a circular shape, the magnetic poles and teeth separated by a gap in an axial direction of... | 10/03/2006 |
| 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 |
| 6995488 | Permanent magnet field small DC motor A permanent magnet field small DC motor includes an arc-shaped rare earth magnet of maximum thickness 1 mm or less fabricated by compression molding from rare earth iron based melt-spun flakes and a binder. The magnet is provided with a certain specific portion at b... | 02/07/2006 |
| 6987340 | DC motor with brushes A DC motor includes a stator of magnets surrounding a rotor containing coils of wire surrounding cores. Brushes serve to repeatedly start and interrupt the supply of current to the individual coils via respective commutator segments of the rotor in order to rotate t... | 01/17/2006 |
| 6943464 | Lithographic apparatus and motor for use in the apparatus A Lorentz actuator provides a force between a first part and a second part of the apparatus, comprising a main magnet system, attached to a first part of the apparatus and providing a first magnetic field; a subsidiary magnet system, attached to the first part and a... | 09/13/2005 |
| 6917132 | DC brush motor and permanent magnet used therein The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum... | 07/12/2005 |
| 6917131 | Transverse mechanical translator with ferrofluid support A mechanical translator includes at least one magnet that is disposed on a substrate to carry a load and has a magnetic axis generally transverse to the substrate, establishing a magnetic field with maximum external density adjacent the substrate. An ultra low frict... | 07/12/2005 |
| 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 |
| 6838797 | Flux ring for an electric motor A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed from an anisot... | 01/04/2005 |
| 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 |
| 6720697 | Direct-current motor The armature of a direct-current motor is formed by an armature core and armature coils. The core includes teeth, which are arranged at a pitch of a predetermined angle. The coils are wound about every group of selected teeth of a predetermined number. Two magnets f... | 04/13/2004 |
| 6717296 | Lithographic apparatus and motor for use in the apparatus A Lorentz actuator provides a force between a first part and a second part of the apparatus, comprising a main magnet system, attached to a first part of the apparatus and providing a first magnetic field; a subsidiary magnet system, attached to the first part and a... | 04/06/2004 |
| 6707213 | Hybrid magnet type DC motor A DC motor has a stator that is constituted as a hybrid magnet. The stator has a plurality of electromagnets and permanent magnets that are alternately arranged in the circumferential direction of the stator. Fixed cores of the electromagnets have pole cores that ha... | 03/16/2004 |
| 6628030 | Direct current motor using magnets with extensions A direct current motor is comprised of an armature, magnets arranged to face each other through the armature, a commutator and brushes. The armature has a core and a plurality of coils wound on the core. Each magnet has a main part and an extension extend... | 09/30/2003 |
| 6580190 | Circumferential confronting type motor A circumferential confronting type motor includes an armature core that has drive coils wound around its plurality of poles, and a drive magnet positioned opposite to the armature core in the radial direction. The drive magnet has a plurality of divided m... | 06/17/2003 |
| 6462448 | Flux ring for an electric motor A flux ring for a motor of a power tool has an annular housing which fits inside the motor can of the motor. At least one magnet is on the ring. The at least one magnet includes a portion formed from an isotropic magnetic material and a portion formed fro... | 10/08/2002 |
| 6020666 | Two-pole motor A pair of magnets (51, 52) oppositely disposed on each side of a rotor 1 are respectively magnetised such that the surface of each magnet facing the rotor 1 includes the North and South poles in a predetermined proportion. When no electric current is supp... | 02/01/2000 |
| 5677587 | Small motor having drive magnet with magnetization pattern for biasing rotor shaft A small motor includes a rotor fastened to a rotor shaft; a drive magnet disposed facing to the rotor; and bearings for rotatably supporting the rotor shaft with the rotor fastened thereto, wherein a magnetization pattern of the magnet is shaped in such a... | 10/14/1997 |
| 5631093 | Magnetically coded device Nonmagnetized permanent magnet material is heated in a pattern by a laser beam to a localized temperature above the Curie point or a temperature sufficient to reduce the coercivity sufficiently for an external field to magnetize the pattern in the directi... | 05/20/1997 |
| 5434462 | High-power electrical machinery An electrical machine having a stator formed from a pair of cup-shaped permanent magnets symmetrically disposed on opposite sides of a conductive, disk-shaped rotor. The magnets are polarized such that a portion of their external magnetic flux passes in o... | 07/18/1995 |
| 5426338 | High-power electrical machinery with toroidal permanent magnets A pair of hollow permanent magnets mounted to form a toroidal stator having cylindrical gaps and opposed cavities. The magnets are polarized such that their magnetic flux passes in one direction through the gaps to intersect the rotor along two cylindrica... | 06/20/1995 |
| 5341053 | Linear motor with permanent magnets A linear motor having a magnetic circuit and a moving coil, the magnetic circuit comprising a linear yoke provided at the center of the circuit and a pair of linear magnets, the linear yoke and the pair of linear magnets forming a pair of linear gaps with... | 08/23/1994 |
| 5317228 | High-power electrical machinery with toroidal permanent magnets A pair of hollow permanent magnets mounted to form a toroidal stator having cylindrical gaps and opposed cavities. The magnets are polarized such that their magnetic flux passes in one direction through the gaps to intersect the rotor along two cylindrica... | 05/31/1994 |
| 5309055 | High-power electrical machinery An electrical machine having a stator formed from a pair of cup-shaped permanent magnets symmetrically disposed on opposite sides of a conductive, disk-shaped rotor. The magnets are polarized such that a portion of their external magnetic flux passes in o... | 05/03/1994 |
| 5206556 | Field magnet for miniature motors A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; an a rotor comprising a rotor winding wound on a rotor core; electric curre... | 04/27/1993 |
| 5204569 | Anisotropic magnet for rotary electric machine An anisotropic magnet for a rotary electric machine having at least two magnetic pole portions in a cylindrical yoke. An anisotropic magnet constituting the magnetic pole portions is arranged such that a central portion of each magnetic pole portion has l... | 04/20/1993 |
| 5170084 | Wide-angle arc segment magnet and brush motor containing it In a brush motor comprising a stator assembly constituted by a permanent magnet assembly and a cylindrical yoke, a stator provided with coils diametrically opposing to each other and rotatably disposed within the stator assembly, and a brush, the permanen... | 12/08/1992 |
| 5162684 | Field magnet for miniature motors A field magnet for miniature motors of a type having a stator comprising a field magnet fixedly fitted to a motor housing, an end plate fitted to an open end of the motor housing; and a rotor comprising a rotor winding wound on a rotor core; electric curr... | 11/10/1992 |
| 4994702 | Motor A motor includes a field magnet system comprised of plural permanent magnetic poles arranged in a circle and an armature with plural poles each facing the magnetic poles of the field magnetic system. The widthwise length of a magnetic flux generating area... | 02/19/1991 |
| 4896065 | Miniature motor A miniature motor comprising a motor case having a bearing on the closed end face thereof, a stator consisting of a permanent magnet, brushes and terminals; and a rotor fixedly fitted to a motor shaft in the motor case and having core windings and a commu... | 01/23/1990 |
| 4814654 | Stator or rotor based on permanent magnet segments The novel rotor or stator comprises a symmetrical assembly of permanent-magnet segments, the working faces of which are separated. Each segment is magnetized to have one pole extending across one-half of its working face and the opposite pole extending ac... | 03/21/1989 |
| 4703210 | Miniature electric non-uniform magnetization rotating machine A miniature electric rotating machine has a stator equipped with a field pole on a peripheral circle of a rotor, and the field pole is constituted by a permanent magnet. Each permanent magnet of a miniature electric rotating machine of this type can be di... | 10/27/1987 |
| 4687608 | Composite permanent magnet for magnetic excitation and method of producing the same The present invention relates to a composite permanent magnet for magnetic excitation, used in a permanent type rotary machine such as permanent magnet type generators or permanent magnet type motors, which composite magnet comprises a first part and a se... | 08/18/1987 |
| 4445059 | Electric motor, in particular a small motor Two-component, permanent field magnets are located opposite the armature and protrude beyond the armature core at both axial ends. The flux yield of the field magnets is improved in comparison with conventional two-component magnets by positioning a secti... | 04/24/1984 |
| 4438362 | Self-starting, direct current motor with permanent magnets of varied magnetic strength A permanent magnet, direct current motor is made self-starting by the use of permanent magnets with varying magnetization. The use of permanent magnets with varying magnetization results in a rotor position after motor de-energization such that the rotor ... | 03/20/1984 |
