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| Number | Title | Issue Date |
| 7132773 | Brushless direct current motor A direct current motor having a stator that has a plurality of radially arranged stator pole bridges to each of which one phase is allocated, at least one stator pole group being formed by at least two adjoining stator poles which are associated with the same phase,... | 11/07/2006 |
| 7036207 | Stator assembly made from a plurality of toroidal core segments and motor using same A plurality of stator arc segments form a toroidal core for a stator assembly used to make a motor. In a preferred embodiment, a plurality of magnetic fields is created when electrical current is conducted through wire wound around poles on the toroidal core. A mono... | 05/02/2006 |
| 6984910 | Generator with composite rotor coil retention components A coil retention system for a rotor of an electrical generator, such as an aircraft generator, that includes one or more components made of a high strength, lightweight composite material. By making one or more of the coil retention system components of a high stren... | 01/10/2006 |
| 6933818 | Torque motors A torque motor may include a rotor having at least two magnets disposed thereon, and a stator having a core and at least one coil. The magnets are arranged and constructed so that the outer surfaces thereof alternately have a N pole and a S pole. The magnets cover t... | 08/23/2005 |
| 6903469 | Stepping motor A stepping motor includes a stator and a permanent-magnet rotor having a rotor axis. The stator is a stator blade made of soft magnetic materials whose center position is a rotor hole accommodating the rotor. Coils are provided on two sides of the stator blade. With... | 06/07/2005 |
| 6858956 | Magnetic pole position detector for rotor A rotor (17, 31, 71, 91, 101, 121, 131, 141, 201, 401) of a motor (13, 51) is provided with a rotation shaft (21, 59, 410) and a plurality of magnets (15, 53, 75, 105, 210A, 210B, 411) on a circular periphery. Plates (25,... | 02/22/2005 |
| 6838799 | Liquid cooled DC motor apparatus A DC motor apparatus includes a motor housing assembly which includes an outer liquid-tight coolant chamber and an inner, armature-reception chamber portion. Pairs of permanent magnet stator magnet modules are housed within the liquid-tight coolant chamber, and shun... | 01/04/2005 |
| 6803691 | Ring-shaped motor core An electrical machine comprises a magnetically permeable ring-shaped core centered on an axis of rotation and having two axially-opposite sides. Coils are wound toroidally about the core and disposed sequentially along the circumferential direction. Each coil includ... | 10/12/2004 |
| 6777848 | Laminated stator body for an electrical machine a high-voltage generator, notches (3) leading radially inward are provided in each segmental lamination (1) on the radial outside of the laminated stator body and end in a relief opening. The notches (3) cause the amplitude and the frequency of,... | 08/17/2004 |
| 6777835 | Electrical power cooling technique The apparatus for cooling a high power electrical transformer and electrical motors uses thermally conductive material interleaved between the turn layers of a high power transformer and iron core laminates to provide a low resistant thermal path to ambient. The str... | 08/17/2004 |
| 6566784 | Stator structure with single-arm tooth holders The present invention provides a stator structure, which keeps a lower cogging torque in the rotation direction of a motor at the same time of raising the magnetic reluctance between adjacent tooth holders of the stator. A tooth-holding end of each of eac... | 05/20/2003 |
| 6249070 | Rotating assembly and support therefor A shaft (14) is formed with a magnetically transparent portion within its length, so as to enable passage therethrough of electromagnetic flux from stator poles, to a further shaft (20) to cause shaft (20) to move to a position in space, coaxial with the ... | 06/19/2001 |
| 6236135 | Toroidal core type actuator with phase separator To provide a toroidal core type actuator having a stator unit which is increased in winding density, is improved in methods of the terminal handling after winding, the positioning of the stator after winding, and the fixing of the same, and is excellent i... | 05/22/2001 |
| 6166463 | Axial force electrical machines The present invention resides in a radial air gap machine with a serrated air gap that can minimize external axial forces. This is accomplished by controlling the relationship between the air gap surfaces in the stator and rotor sections. To control the r... | 12/26/2000 |
| 6034462 | Cylindrical air gap electrical machines A cylindrical or radial air gap, electrical machine is defined which comprises a circular rotor section having a serrated circular surface area mounted on a shaft with rotation means, two or more circular stator sub sections having circular serrated surfa... | 03/07/2000 |
| 6031311 | Brushless DC motor capable of preventing leakage of magnetic flux A brushless DC motor has a stator and a rotor. The stator has a stator core and excitation coils wound around the stator core. The rotor has a rotor core disposed at the inner space of the stator, and many permanent magnets inserted into the rotor core. T... | 02/29/2000 |
| 5880546 | Magnetic actuator provided with a separator wall A magnetic actuator, for example a magnetic bearing, embodies a fixed part and a mobile part. These parts are ferromagnetic and form an airgap between them extending parallel to a predetermined first direction. The magnetic actuator further embodies a non... | 03/09/1999 |
| 5420471 | Electric generator utilizing minimal mechanical power An electric generator which can be powered using a minimal amount of mechanical power, and in particular, an electric generator having a weak electromagnet which acts as a stator core, thus enabling electric power generation to occur while only minimal am... | 05/30/1995 |
| 5369323 | Composite magnet stepper motor A stepper motor is provided that is compact, easily manufactured, and provides high torque. The stepper motor comprises a multi-pole composite magnet which functions as a rotor, at least one stator member which determines the angular position of this roto... | 11/29/1994 |
| 5306977 | Cooling rotor for an alternator mounted on vehicle A rotor for an alternator mounted on a vehicle comprises first and second claw-pole members formed of magnetic material and mounted on a shaft rotatable about an axis. The first and second claw-pole members have at least one first axially extending claw s... | 04/26/1994 |
| 5175460 | Flat yoke type DC machine A DC motor including a rotatable armature, a pair of permanent magnets functioning as magnetic stator poles, and a flat yoke having a pair of opposed arcuate sections and a pair of opposed flat sections, for receiving the armature. Each of the arcuate sec... | 12/29/1992 |
| 5122704 | Composite rotor sleeve Leakage of a coolant into the air gap (16) of a dynamoelectric machine so as to cause undesirable windage losses may be avoided through the use of a composite rotor sleeve (44) including a continuous film (46) of polyimide material on its radially inner s... | 06/16/1992 |
| 5070264 | Position sensor DC motors without collectors require position sensors, which recognize or identify the angular position of the rotor, in order to supply a pulse for control of the current in the coil at a suitable point in time. Hall probes which, as a rule, are used as ... | 12/03/1991 |
| 4990809 | Variable reluctance motor A high torque-to-low mass variable reluctance motor includes a cylindrical stator assembly having a plurality of stator segments circumaxially arranged about a rotor wherein adjacent stator segments are maintained in a spaced apart relation with one anoth... | 02/05/1991 |
| 4990806 | Pulse motor In a pulse motor comprising a rotor, a drive coil excited by a predetermined drive current to drive the rotor, and a yoke for guiding a magnetic flux generated by the drive coil to a predetermined magnetic path; the yoke is provided with an aperture to re... | 02/05/1991 |
| 4843271 | Conductive metal inserts in rotor dynamoelectric machine A rotor of a dynamoelectric machine includes a coating of a high-conductivity metal covering a substantial portion of the surface thereof. The high-conductivity metal reduces resistive heating produced by eddy currents from high-frequency harmonics of an ... | 06/27/1989 |
| 4623811 | Motor-fan assembly for vacuum cleaner Structure for maintaining accurate spacing between opposed pole elements of a split-field coil structure. The motor structure includes a support for supporting the armature for rotation about an axis and a field coil structure having opposed C-shaped lami... | 11/18/1986 |
| 4510407 | Permanent magnet type motor having improved pole structure A permanent magnet type motor having a stator which comprises a yoke, a plurality of main magnetic poles made of permanent magnets, and a plurality of auxiliary magnetic poles, each of the main magnetic poles and each of the auxiliary magnetic poles being... | 04/09/1985 |
| 4454439 | Air gap winding rotating electric machine In large capacity and superconducting rotating electric machines, the stator coil windings are frequently placed in the air gap between the stator core and the rotor. This so-called air gap winding rotating electric machine has the drawback that reliably ... | 06/12/1984 |
| 4132932 | Balanced split-phase electric motor A motor is disclosed in which the main stator winding of, for example, a squirrel case inducting motor, is connected in series with a capacitor so that the capacitor, together with the input voltage, causes the stator core to periodically switch from a no... | 01/02/1979 |
