| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 09/11/2002 | CN1090799C Equivalent balanced transformer |
| 09/10/2002 | US6449178 Magnetron drive step-up transformer and transformer of magnetron drive power supply |
| 09/04/2002 | CN1367504A Roller type plane contact voltage regulating device |
| 08/15/2002 | WO2002048718A3 Condition diagnosing |
| 08/15/2002 | US20020109571 Magnetic core comprising a bond magnet including magnetic powder whose particle's surface is coated with oxidation-resistant metal |
| 08/14/2002 | CN2505969Y Special loaded capacity modulated transformer for oil gas field |
| 08/14/2002 | CN1363939A Magnet core with magnetic deflecting body and inductor therewith |
| 08/07/2002 | CN2504740Y Regulation mechanism of regulating transformer |
| 08/06/2002 | US6429765 Controllable inductor |
| 08/01/2002 | WO2002045101A3 System and method for orthogonal inductance variation |
| 07/31/2002 | CN2503581Y Continuous inductance regualting air reactor |
| 07/30/2002 | US6426610 Controlled ferroresonant constant current source |
| 07/25/2002 | WO2002058088A1 Thyristor tap changer |
| 07/25/2002 | US20020097130 Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer |
| 07/25/2002 | US20020097127 Magnetic core including bias magnet and inductor component using the same |
| 07/25/2002 | US20020097126 Magnetic core including magnet for magnetic bias and inductor component using the same |
| 07/25/2002 | DE10148040A1 Regelbarer Induktionsformator mit elektronischer Steuerung Adjustable Induktionsformator with electronic control |
| 07/24/2002 | CN1360319A Magnetic core contg. magnetic bias magnet and induction element with said magnetic core |
| 07/18/2002 | US20020093409 Magnetic core having magnetically biasing bond magnet and inductance part using the same |
| 07/17/2002 | CN2501170Y Two-stage sealing structure for tap changer of transformer |
| 07/17/2002 | CN1359115A Magnetic core with magnetic offset composite magnet and inductive element using said magnet core |
| 07/17/2002 | CN1359114A Magnetic core contaiing addrssive magnet with magnetic power with anti-oxidation metal coated on surface |
| 07/11/2002 | US20020089400 Inductor component having a permanent magnet in the vicinity of magnetic gap |
| 07/10/2002 | CN1087585C Electrical power control system |
| 07/04/2002 | WO2002027910A3 Sub-cycle static voltage regulator and controller |
| 07/04/2002 | WO2002023301A8 Wide ratio autotransformer-type current ranging |
| 07/03/2002 | CN1357151A Electric switching device |
| 07/02/2002 | US6414267 Method and apparatus for control of a welding power source |
| 06/26/2002 | CN2497413Y Gear-increasing under-load voltage-regulating transformer installation |
| 06/26/2002 | CN2497412Y Add-subtract type voltage regulator |
| 06/20/2002 | WO2002048730A1 Tap changer condition diagnosing |
| 06/20/2002 | WO2002048729A1 Tap changer monitoring |
| 06/20/2002 | WO2002048718A2 Condition diagnosing |
| 06/20/2002 | DE10102310C1 Thyristor stepping switch for stepping transformer has hybrid construction with mechanical stepping switch and thyristor load switching device in separate housing |
| 06/19/2002 | CN1354485A Inductance coil element of permanent magnet near magnetic gap |
| 06/13/2002 | DE10050932C1 Spring energy store for electrical stepping switch uses tensioning spring(s) between linearly displaced carriage and linearly displaced driven piece for rotation of switch drive shaft |
| 06/11/2002 | US6404320 Method for adjusting the inductance of an inductor |
| 06/06/2002 | WO2002045101A2 System and method for orthogonal inductance variation |
| 06/06/2002 | DE10058867A1 Generating and dimensioning high currents involves passing electrically conducting material through internal chamber of unit formed by at least one power unit and dimensioning unit |
| 06/05/2002 | EP1211700A2 Magnetic core including magnet for magnetic bias and inductor component using the same |
| 06/05/2002 | EP1211699A2 Magnetic core having magnetically biasing bond magnet and inductance part using the same |
| 05/30/2002 | US20020063487 Electromagnetic device |
| 05/29/2002 | EP1209704A1 Choke coil with ferromagnetic material core |
| 05/29/2002 | EP1209703A2 Magnetic core comprising a bond magnet including magnetic powder whose particle's surface is coated with oxidation-resistant metal |
| 05/29/2002 | EP1208411A1 Transformer with secondary voltage electronic adjustment |
| 05/29/2002 | DE10058631A1 Drosselspule mit einem Kern aus ferromagnetischem Material Choke coil having a core made of ferromagnetic material |
| 05/23/2002 | US20020060621 System and method for orthogonal inductance variation |
| 05/22/2002 | EP1207540A1 Inductor component having a permanent magnet in the vicinity of magnetic gap |
| 05/22/2002 | CN1350692A Contact assembly on a preselector |
| 05/21/2002 | US6392521 Variable inductance transformer with electronic control |
| 05/16/2002 | US20020057165 Controllable inductor |
| 05/15/2002 | CN2491952Y Boring switch |
| 05/02/2002 | US20020050905 Inductance component in which a permanent magnet for applying a magnetic bias is arranged outside an excitation coil |
| 05/02/2002 | US20020050829 Thyristor linked inductor |
| 05/02/2002 | EP1202295A2 Magnetic core including bias magnet and inductor component using the same |
| 05/01/2002 | CN2489457Y Vacuum tube inverse mounted cam switching mechanism |
| 04/25/2002 | US20020047439 High voltage ac machine winding with grounded neutral circuit |
| 04/25/2002 | US20020047268 Rotating electrical machine plants |
| 04/24/2002 | EP1078380B1 Load selector switch |
| 04/18/2002 | WO2002031847A1 Energy accumulator for a sequence switch |
| 04/17/2002 | EP1196934A1 Electric switching device |
| 04/17/2002 | CN2487085Y Magnetic control type controllable reactor |
| 04/11/2002 | DE10047892A1 Steplessly variable inductance has inductance formed between terminals of main winding, while DC is supplied to auxiliary winding |
| 04/10/2002 | EP1105896B1 Step switch with selector |
| 04/10/2002 | CN2485771Y Switching controller for loading switch |
| 04/10/2002 | CN1343994A Inductance componnet having permanent-magnet for applicating magnetic deflection outside of exciting coil |
| 04/10/2002 | CN1343993A Magnetic core having effective magnetic polarization and magnetic device using same |
| 04/10/2002 | CN1343992A On load tapping switching transformer |
| 04/04/2002 | WO2002027910A2 Sub-cycle static voltage regulator and controller |
| 04/04/2002 | WO2001075913A3 A variable induction device |
| 04/04/2002 | US20020039061 Magnetically biased inductor or flyback transformer |
| 04/03/2002 | CN2484626Y Electric transformer with loader voltage-regulating switch fitted on top of oil-tank |
| 04/03/2002 | CN2484625Y Voltage-regulating transformer |
| 04/03/2002 | CN1082233C Choke and making method of same |
| 03/26/2002 | US6362718 Motionless electromagnetic generator |
| 03/21/2002 | WO2002023301A1 Wide ratio autotransformer-type current ranging |
| 03/20/2002 | CN2482731Y Electric transformer once side-regulating voltage apparatus |
| 03/14/2002 | WO2002021546A1 High efficiency inductor |
| 03/14/2002 | WO2002021544A1 Method for manufacturing tapped coil, tapped coil, and apparatus for manufacturing tapped coil |
| 03/14/2002 | WO2002021543A1 Permanent magnet, magnetic core having the magnet as bias magnet, and inductance parts using the core |
| 03/14/2002 | US20020030574 Magnetic core having an effective magnetic bias and magnetic device using the magnetic core |
| 03/13/2002 | EP1187151A1 Magnetic core having an effective magnetic bias and magnetic device using the magnetic core |
| 03/13/2002 | EP1187150A1 Inductance component in which a permanent magnet for applying a magnetic bias is arranged outside an excitation coil |
| 03/13/2002 | CN2482197Y Assembly bell type power transformer loaded voltage-regulating switch |
| 03/06/2002 | EP1183699A1 Contact assembly on a preselector |
| 03/06/2002 | CN2481050Y Secondary side voltage regulator for power transformer |
| 02/27/2002 | CN1337722A Automatically voltage-regulating double-voltage transformer |
| 02/26/2002 | US6351106 Static voltage regulator and controller |
| 02/21/2002 | US20020021202 Method for adjusting the inductance of an inductor |
| 02/19/2002 | US6348848 Transformer having fractional turn windings |
| 02/19/2002 | CA2039819C Load switch for a step transformer |
| 02/05/2002 | US6344699 A.C. current distribution system |
| 01/31/2002 | US20020011486 Transverse flux induction heating device with magnetic circuit of variable width |
| 01/23/2002 | CN2473727Y Simple compound loaded tapping switch |
| 01/16/2002 | EP1171893A1 Variable power transformer of any voltage supply steady current intensity and absolute accuracy |
| 01/10/2002 | US20020003420 Hybrid tap-changing transformer with full range of control and high resolution |
| 01/09/2002 | EP0956629B1 An a.c. current distribution system |
| 01/02/2002 | CN2469531Y Contact positioner of transformer tap switch |
| 12/26/2001 | CN2468142Y Non-excitation linear voltage-regulating drum tap changer |
| 12/19/2001 | CN1327601A A switchable flux control for high power static electromagnetic device |