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| Number | Title | Issue Date |
| 8058958 | Device and method for eliminating transformer excitation losses The invention is a device and method for eliminating core excitation losses in a distribution transformer when the transformer is not supplying power to loads. The invention consists of sensors, a control circuit, a user interface and a power contactor. The power co... | 11/15/2011 |
| 7990242 | Transient voltage and harmonic currents quashing (THQ) transformers, transformer winding topology, and method of making the same Different configurations of transient voltage quashing (TQ) transformers, harmonic current quashing (HQ) transformers, and transient voltage and harmonic current quashing (THQ) transformers include one or more of: a tertiary winding radially placed between the prima... | 08/02/2011 |
| 7969264 | Choke device for frequency converter A choke device for a frequency converter, comprising three windings composed of conductors wound around three substantially parallel axes (A, B, C), respectively, the windings being located triangularly with respect to each other in such a manner that, when the chok... | 06/28/2011 |
| 7969265 | Zigzag autotransformer apparatus and methods A transformer includes a zigzag transformer comprising first, second and third magnetic cores. The transformer further includes an auxiliary winding set comprising respective pairs of series-connected windings on respective pairs of the first, second and third magne... | 06/28/2011 |
| 7948340 | Three-phase multi-winding device A three-phase, multi-winding includes a core, the core including a hub and an outer shell around a perimeter of the hub. wherein the hub and the outer shell are in a fixed position with respect to each other. The core also includes multiple slots. In addition to the... | 05/24/2011 |
| 7880575 | Coil bus for a transformer A transformer having high and low voltage coils mounted to legs of a core is provided. Each low voltage coil includes conductor sheeting having opposing first and second ends and opposing first and second side edges. A pair of coil bus bars is provided for each low ... | 02/01/2011 |
| 7859376 | Zigzag autotransformer apparatus and methods A zigzag autotransformer includes a zigzag transformer including first, second and third magnetic cores and an auxiliary winding set including respective pairs of series-connected windings on respective pairs of the first, second and third magnetic cores, the pairs ... | 12/28/2010 |
| 7796003 | Multi-parallel magnetic-field cancellation type transformer A multi-parallel magnetic-filed cancellation type transformer includes a plurality of coils which generate magnetic flux during energization and a core having a plurality of magnetic leg portions on which the coils are wound, and bases for fixing the magnetic leg po... | 09/14/2010 |
| 7772953 | Symmetrical auto transformer delta topologies Various embodiments of multi-phase transformers are disclosed. Exemplary transformer includes primary windings, secondary windings and third windings. Primary windings, secondary windings and third windings may include sub windings coupled to form functions. Primary... | 08/10/2010 |
| 7772954 | Symmetrical auto transformer wye topologies Various embodiments of multi-phase transformers are disclosed. For example, a transformer includes primary windings, secondary windings and third windings. Primary windings, secondary windings and third windings may include sub windings coupled to form junctions. Pr... | 08/10/2010 |
| 7692523 | Multi-voltage power transformer for the high-voltage electricity transmission network A multi-voltage power transformer for the high-voltage electricity transmission network, has a compact design and has different selectable voltage levels at the input and/or output. ... | 04/06/2010 |
| 7646275 | Device and method for eliminating transformer excitation losses The invention is a device and method for eliminating core excitation losses in a distribution transformer when the transformer is not supplying power to loads. The invention consists of sensors, a control circuit, a user interface and a power contactor. The power co... | 01/12/2010 |
| 7436277 | Power transformer A multi-phase transformer is provided that includes a first layer having at least a first planar wire and a second planar wire and a second layer formed on the first layer and having at least a third planar wire and a fourth planar wires. At least the first planar w... | 10/14/2008 |
| 7369024 | Compact dry transformer Compact dry transformer (1A) consisting of a magnetic material core (2) provided with a first heat sink consisting of covers (10) having cooling fins (11) on the outer surface thereof. The transformer also consists of a coil assembly (... | 05/06/2008 |
| 7352594 | Stage for rectifying a three-phase current The rectification stage (18) having: an autotransformer (40) for twelve-phase rectification; two rectifiers (50A, 50B) each of which is connected at the input to three separate phases of... | 04/01/2008 |
| 7330095 | Cooled multiphase choke assembly A cooled multiphase choke assembly comprising a first coil (L1, L2, L3) for each phase (U, V, W) and a first cooling element (11), each first coil (L1, L2, L3) comprising several turns of winding, which define a subst... | 02/12/2008 |
| 7323664 | Heating system A heating system includes a plurality of radiant heaters, a power source supplying electricity to the radiant heaters, and a transformer provided between the radiant heaters and the power source, wherein each of the radiant heaters includes a support plate substanti... | 01/29/2008 |
| 7307361 | Medium voltage power converter formed using low voltage drives A medium voltage power converter is provided that has an input transformer adapted to connect to a multi-phase power source, multiple low voltage drives each coupled to a respective set of secondary windings of the input transformer and operatively configured to pro... | 12/11/2007 |
| 7304446 | Sensorless and brushless DC motor A sensorless and brushless motor is disclosed including a stator, a rotor, a control circuit and an induction coil (50). The stator includes a stator core (30) and a stator coil (34) wound around the stator core. The rotor includes a rotor magne... | 12/04/2007 |
| 7295097 | Energy saving system for a unit requiring electricity An electrical energy saving device or a magnetic induction device is adapted to surround a power delivery line. The magnetic induction device applies a magnetic field region to the power delivery line to reduce amperage up to about 25%. The magnetic induction device... | 11/13/2007 |
| 7279851 | Systems and methods for fault protection in a balancing transformer An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 10/09/2007 |
| 7274280 | Nine-phase step-up/step-down autotransformer An irregular polygon connection of a three-phase autotransformer using only five windings per phase provides a source of nine-phase power suitable for an 18-pulse AC to DC power converter. The windings are connected in a manner to limit the amount of third harmonic ... | 09/25/2007 |
| 7180248 | Inductively coupled ballast circuit A ballast circuit is disclosed for inductively providing power to a load. The ballast circuit includes an oscillator, a driver, a switching circuit, a resonant tank circuit and a current sensing circuit. The current sensing circuit provides a current feedback signal... | 02/20/2007 |
| 7176779 | Inductor arrangement An inductor arrangement for a frequency converter or corresponding electrical apparatus, the inductor arrangement comprising an input inductor coupled to the input side of the electrical apparatus and an output inductor coupled to the output side of the apparatus, t... | 02/13/2007 |
| 7148599 | Iron core winding, method of winding an iron core, and variable reluctance angle detector An iron core winding is such that a winding of a given polarity is coiled in series so that the beginning of each coiling and the ending of each coiling cross on a magnetic pole that is positioned in the direction of a circumference of the iron core. When the windin... | 12/12/2006 |
| 7148782 | Magnetic core for stationary electromagnetic devices An energizable magnetic core for use in an inductor or a transformer includes a plurality of legs extending from the back yoke. The back yoke is formed in a loop arranged to provide a magnetic circuit. Each of the plurality of legs have a first end adjacent to the b... | 12/12/2006 |
| 7141933 | Systems and methods for a transformer configuration for driving multiple gas discharge tubes in parallel An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, efficient, and good performing. Embodiments ... | 11/28/2006 |
| 7136293 | Full wave series resonant type DC to DC power converter with integrated magnetics A full wave DC/DC converter magnetically integrates into the transformer assembly the functions of the resonant inductor, magnetizing inductor and the output filter inductor. The primary and the secondary windings are assembled on a gapped center leg of an E-core, w... | 11/14/2006 |
| 7119536 | Two-resolver deviation angle detector having serially connected output windings A deviation angle detector enlarges the application range by enlarging the detectable deviation angle range. The deviation angle detector has two resolvers, which have rotors, stators, and single excitation windings and multiple output windings that are coiled aroun... | 10/10/2006 |
| 7112946 | Transformer with selectable input to output phase angle relationship A three-input induction transformer in which the phase relationship of the power output relative to the power input is selectable/adjustable after the transformer is placed in operation in the field. The transformer includes a primary set of windings and a three-pol... | 09/26/2006 |
| 7088212 | Transformer with variable reluctance A transformer having variable reluctance, that controls the amount of power conveyed from an input to a load, based on a value selected by a computer control. The load power is varied by controlling the section and air gap between two parallel iron cores and a magne... | 08/08/2006 |
| 7061183 | Zigzag topology for balancing current among paralleled gas discharge lamps An apparatus and methods for balancing current in multiple negative impedance gas discharge lamp loads. Embodiments advantageously include balancing transformer configurations that are relatively cost-effective, reliable, and efficient. Embodiments include configura... | 06/13/2006 |
| 7049921 | Auto-transformer for use with multiple pulse rectifiers Zig-zag connected, phase shifting, auto-transformers that provides the inherent ability to block the flow of zero sequence currents that are associated with multiple-pulse rectifiers. The transformer coils are wound in three separate, multi-wound windings on three s... | 05/23/2006 |
| 7042323 | Signal transformer and method for operating such a signal transformer A signal transformer having a primary limb and a first secondary limb is specified, a primary winding at least partly enclosing the primary limb and a secondary winding at least partly enclosing the first secondary limb and the primary limb being connected to the fi... | 05/09/2006 |
| 7034509 | Multiple voltage generating There are apparatus and methods for generating a plurality of voltage levels. There is a rotor that includes a first and a second portion of rotor windings. The first portion of rotor windings is constructed and arranged to establish a first magnetic field of a firs... | 04/25/2006 |
| 7034647 | Integrated magnetics for a DC-DC converter with flexible output inductor An integrated magnetic assembly that allows the primary and secondary windings of a transformer and a separate inductor winding to be integrated on a unitary magnetic structure is disclosed. The unitary magnetic structure includes first, second, and third legs that ... | 04/25/2006 |
| 7027279 | Combined harmonic filter and phase converter or phase shifting device A harmonic mitigating device also functions as a phase converter for supplying single-phase non-linear loads, or as a phase shifting device for three-phase non-linear loads with multiple inputs to create a quasi multi-pulse system. A multiple-winding reactor or a pl... | 04/11/2006 |
| 7023311 | Overlapped superconducting inductive device An electrical device operating on the principle of induction, such as a transformer. The device employs High Temperature Superconductors to build pancake coils having a very low height to diameter ratio. These pancake coils are placed around ferromagnetic core legs ... | 04/04/2006 |
| 6995993 | Rectification system for improving power quality of electrical power systems A system and method for an autotransformer configuration including a plurality of windings which can be used to provide a substantial reduction in harmonics. The autotransformer includes a series of wye windings configured to provide a constant length voltage vector... | 02/07/2006 |
| 6930578 | Field adjustable phase shifting transformer A field-adjustable phase shifting transformer apparatus for canceling harmonic currents in a three-phase alternating current (AC) power distribution system includes a primary having a plurality of sets of contact points for receiving power from a three-phase AC powe... | 08/16/2005 |
