| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 11/05/2003 | EP1358499A1 Tap changer monitoring |
| 11/05/2003 | EP0886785B1 Method for monitoring of tap changers by acoustic analysis |
| 11/05/2003 | CN1127006C Method and device for automatically switching three phase voltage for power saving transformer |
| 10/28/2003 | US6639499 Inductance component in which a permanent magnet for applying a magnetic bias is arranged outside an excitation coil |
| 10/15/2003 | EP1352404A1 Thyristor tap changer |
| 10/15/2003 | CN2580576Y Rotary coil type contact voltage regulator |
| 10/08/2003 | EP1350292A2 Condition diagnosing |
| 10/01/2003 | CN1445799A Flat surface contacted voltage regulator with big capacity |
| 10/01/2003 | CN1123020C Step switch with selector |
| 09/30/2003 | CA2135803C Step switch |
| 09/24/2003 | CN1444741A Magnetic controlled current or voltage regulator and transformer |
| 09/17/2003 | CN2574193Y Post contact voltage regulator |
| 09/16/2003 | US6621398 Inductance element such as a choke coil and a transformer for use in a switching power supply or the like |
| 09/09/2003 | US6617949 Choke coil |
| 08/14/2003 | US20030151482 Wide ratio autotransformer-type current ranging |
| 08/13/2003 | EP0901706B1 A method and a device for reducing third harmonic phenomena in a rotating electric alternating current machine |
| 08/06/2003 | EP1106036B1 Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 07/30/2003 | CN2563730Y Pole type plane contact voltage regulator |
| 07/30/2003 | CN2563729Y Loaded voltage regulator for full thyristor non-transient transformer |
| 07/30/2003 | CN1433033A Inductance part with permanent magnet set in magnetic gap |
| 07/29/2003 | US6600402 Bobbins, transformers, magnetic components, and methods |
| 07/23/2003 | EP1330015A1 Magnetic core, coil component comprising it, and power source circuit |
| 07/23/2003 | EP0896269B1 Method and device for automatically switching three-phase voltage for power saving transformer |
| 07/16/2003 | CN2561063Y Gear display control device for tap changer |
| 07/15/2003 | US6594292 Saturable reactor and power source apparatus for pulse laser utilizing same |
| 07/15/2003 | US6593836 Bobbins, transformers, magnetic components, and methods |
| 07/09/2003 | EP1325507A1 Energy accumulator for a sequence switch |
| 07/09/2003 | EP1325394A1 Wide ratio autotransformer-type current ranging |
| 07/09/2003 | EP0900444B1 A controllable inductor |
| 07/08/2003 | US6590488 Configurable transformer |
| 07/08/2003 | US6590485 Magnetic core having magnetically biasing bond magnet and inductance part using the same |
| 07/03/2003 | WO2003055283A1 Programmable system for stabilising and regulating voltage in particular for the improved management of lighting units using fluorescent bulbs and like |
| 06/26/2003 | US20030117251 Controllable transformer |
| 06/26/2003 | US20030117228 Circuit component and transformer device with controllable impedance and with systems equipped with such devices |
| 06/25/2003 | EP1321950A1 Permanent magnet, magnetic core having the magnet as bias magnet, and inductance parts using the core |
| 06/25/2003 | CN2558054Y Sensor mechanismfor speed regualtor of motor |
| 06/24/2003 | US6583703 Electrical apparatus having an electromagnetic device operable at multiple inductance values |
| 06/17/2003 | US6579426 Use of variable impedance to control coil sputter distribution |
| 06/11/2003 | EP1318702A1 Programmable system for stabilising and regulating voltage in particular for the improved management of lighting units using fluorescent bulbs and like |
| 06/05/2003 | US20030102952 Variable power transformer of any voltage supply steady current intensity and absolute accuracy |
| 06/04/2003 | CN2554782Y Screw contact voltage regulator |
| 06/03/2003 | CA2248760C Method for monitoring of tap changers by acoustic analysis |
| 05/30/2003 | WO2003044613A1 Controllable transformer |
| 05/30/2003 | WO2003044612A1 Device with controllable impedance |
| 05/30/2003 | CA2729421A1 Power conversion using controllable transformers |
| 05/28/2003 | CN1109945C Method of monitoring functional capability of tap selector |
| 05/21/2003 | CN2552144Y Power transformer for oil extracting electric immersed pump |
| 05/15/2003 | WO2003041247A1 Motionless electromagnetic generator |
| 04/30/2003 | CN1414578A Isolated voltage regulating transformer and its voltage regulating method |
| 04/24/2003 | US20030076202 Magnetically influenced current or voltage regulator and a magnetically influenced converter |
| 04/23/2003 | EP1303800A1 Magnetic controlled current or voltage regulator and transformer |
| 04/16/2003 | CN2545682Y Excitation-less tap switch |
| 04/09/2003 | EP1183699B1 Contact assembly on a preselector |
| 04/09/2003 | CN1105413C Rotating electrical machine plant |
| 04/08/2003 | US6545582 Magnetic core having an effective magnetic bias and magnetic device using the magnetic core |
| 04/01/2003 | US6541878 Integrated RJ-45 magnetics with phantom power provision |
| 03/19/2003 | EP0900443B1 A controllable inductor |
| 03/06/2003 | US20030043007 Choke coil |
| 02/19/2003 | CN2537110Y Vaccum branching switch with load |
| 02/19/2003 | CN1101988C Electric high voltage AC machine |
| 02/18/2003 | CA2226498C Electrical power control system |
| 02/13/2003 | WO2002086647A3 Arrangement for automatically influencing a mains supply and motor drive for said arrangement |
| 02/12/2003 | EP1282905A1 Energy dimmer drive and energy pilot |
| 02/05/2003 | CN2534660Y 10KV distributing transformer contactless automatic regulating voltage device |
| 01/29/2003 | CN2533558Y Contact roller loop coil contact voltage regulator |
| 01/22/2003 | CN1392574A Tapping change-over operation control mechanism for loaded tapping switch |
| 01/15/2003 | EP0951723B1 A controllable inductor |
| 01/15/2003 | CN2531507Y Electronic load tap changer |
| 01/09/2003 | US20030006874 Winding structure of inductor used in power factor correction circuit |
| 01/07/2003 | US6504737 Soft-magnetic alloy; higher frequency, reduced size, high efficiency and reliability |
| 01/02/2003 | US20030001706 Configurable Transformer |
| 01/01/2003 | CN2529363Y Dry-type magnetic control regulating transformer |
| 12/27/2002 | WO2002103725A1 Electrical apparatus having an electromagnetic device operable at multiple inductance values |
| 12/27/2002 | WO2002023301A9 Wide ratio autotransformer-type current ranging |
| 12/26/2002 | US20020196118 Electrical apparatus having an electromagnetic device operable at multiple inductance values |
| 12/25/2002 | CN2528091Y High-capacity plane contact voltage regulator |
| 12/24/2002 | US6498328 Transverse flux induction heating device with magnetic circuit of variable width |
| 12/18/2002 | CN2526958Y Non-excitation tap changer |
| 12/17/2002 | US6495779 Contact assembly on a preselector |
| 12/05/2002 | US20020180575 Inductance component comprising a permanent magnet greater in sectional area than a magnetic path and disposed in a magnetic gap |
| 12/04/2002 | EP1263005A1 Inductance component comprising a permanent magnet greater in sectional area than a magnetic path and disposed in a magnetic gap |
| 12/04/2002 | CN1383163A Loading tap changer |
| 11/28/2002 | US20020176460 Saturable reactor and power source apparatus for pulse laser utilising same |
| 11/27/2002 | CN2523000Y Multi-waveband refernece ballast for gas discharge lamp |
| 11/21/2002 | WO2002093600A1 Load selector |
| 11/14/2002 | DE10119664A1 Anordnung zur automatischen Spannungsregelung und Motorantrieb zur automatischen Spannungsregelung An automatic voltage regulator and motor drive for automatic voltage regulation |
| 11/13/2002 | CN1379419A 可变电感器 Variable inductor |
| 11/07/2002 | DE10118569A1 Circuit arrangement for testing uninterruptible power supplies is connected to the UPS on its input side and connected to the power supply network on its output side via a swing transformer and an equalizing coil |
| 10/31/2002 | WO2002086647A2 Arrangement for automatically influencing a mains supply and motor drive for said arrangement |
| 10/31/2002 | CA2440908A1 Arrangement for automatically influencing a mains supply and motor drive for said arrangement |
| 10/29/2002 | US6472851 Hybrid tap-changing transformer with full range of control and high resolution |
| 10/29/2002 | CA2085029C Polarity switch for step-transformer selector |
| 10/23/2002 | CN1375841A Curved compensating transformer and its phase-shift voltage regulating method |
| 10/17/2002 | US20020149458 Magnetically biasing bond magnet for improving DC superposition characteristics of magnetic coil |
| 10/16/2002 | EP0970491B1 A controllable inductor |
| 10/09/2002 | CN1373483A Electronic load tap switch |
| 10/02/2002 | CN2514472Y Roll-type plane contact voltage regulator |
| 09/24/2002 | CA2246998C Method of and device for automatically regulating three-phase voltage for power saving transformer |
| 09/18/2002 | CN2512093Y Loaded voltage regulating transformer |
| 09/11/2002 | CN2510974Y Solid-state on-load switch |