| Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889) |
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| 02/14/1990 | EP0354424A1 Cylindrical tap selector for step-down transformers having contact rings fixed by connecting wires |
| 02/14/1990 | EP0354423A1 Cylindrical tap selector for step-down transformers having contact rings held in place by connecting wires |
| 02/07/1990 | CN2052568U Variable transformer for load current |
| 12/21/1989 | DE3919596A1 Load regulating switch |
| 12/06/1989 | CN2049012U Transformer for steel-smelting furnace |
| 11/30/1989 | DE3913185A1 Current-pulse thyristor triggering |
| 11/28/1989 | US4883977 Magnetic power converter |
| 11/22/1989 | CN1037434A Vector superposed asynchronous motor |
| 11/08/1989 | EP0340800A1 Moving magnetic field electric power converter |
| 11/02/1989 | EP0339164A1 Self-regulated transformer-inductor with air gaps |
| 10/25/1989 | CN2046677U Voltage regulating device with double-carbon brush and automatic balance structure |
| 10/24/1989 | US4876638 Low-noise switching power supply having variable reluctance transformer |
| 10/11/1989 | CN1036290A Ac power amplifier |
| 09/26/1989 | US4870558 Moving magnetic field electric power converter |
| 09/21/1989 | WO1989008948A1 Non-saturating magnetic amplifier controller |
| 09/13/1989 | CN2044366U Adjustable current lifting device |
| 09/06/1989 | CN1035388A Seated contact arrangement in insulating material wall for step selector of step transformer |
| 09/05/1989 | US4864266 High-voltage winding for core-form power transformers |
| 08/29/1989 | CA1258881A1 Self-regulated transformer with gaps |
| 08/23/1989 | CN2043414U Following type a.c power source automatic voltage regulator |
| 08/09/1989 | CN2042622U Single-phase autoinductive coupling type contacting voltage regulator |
| 08/01/1989 | US4853611 Inductive, electrically-controllable component |
| 07/26/1989 | EP0325139A2 Contact arrangement placed in an insulated wall for tap changers of tap transformers |
| 07/26/1989 | EP0325138A1 Method for attaching a contact part fixed in an insulator wall |
| 07/20/1989 | DE3744436A1 Variable transformer |
| 07/05/1989 | CN2040668U Pressure adjuster with trans-switch |
| 06/27/1989 | CA1256475A1 Electromagnetically actuated high dc current switch |
| 06/20/1989 | US4841428 Non-saturating magnetic amplifier controller |
| 06/06/1989 | US4837497 Variable transformer, reactor and method of their control |
| 05/24/1989 | DE3838195A1 Power tap changer |
| 04/19/1989 | CN2036305U Neutral point on-off device for three phase loaded separate swith |
| 04/12/1989 | CN2035947U Sensitive regulator for light of fluorescent lamp |
| 04/12/1989 | CN2035935U Charging apparatus |
| 03/23/1989 | DE3730462A1 Adjustable inductance having a plunger-type core arranged axially on one side |
| 02/08/1989 | CN2032358U Outer magnetism divided transformer |
| 01/18/1989 | CN2031153U Three phase onload electric voltage regulator |
| 01/04/1989 | CN2030369U Contact type automatic voltage regulator |
| 12/29/1988 | WO1988010502A1 Thyristor on-load change-over switch |
| 12/27/1988 | US4794359 Variable transformer |
| 12/14/1988 | CN87213805U Contact type voltage regulator with bidirection adjustable voltage |
| 11/24/1988 | DE3714798A1 Infinitely variable controllable transformer |
| 11/10/1988 | DE3714696A1 Transformer having a variable transformation coefficient |
| 11/02/1988 | CN88200460U Add-subtract type energy-saving voltge regulator |
| 11/02/1988 | CN87209276U Protable compensated voltage regulater |
| 11/01/1988 | US4782437 Magnetic material biasing method and apparatus |
| 10/25/1988 | US4780655 Drive and position sensor for a driven part |
| 10/19/1988 | CN87211431U Capacitor adjustable transformer |
| 10/12/1988 | CN87212018U Output-extended contact voltage regulator |
| 10/05/1988 | EP0284615A1 Magnetic material biasing method and apparatus. |
| 09/07/1988 | CN87208902U Safety valtage regulator |
| 08/31/1988 | EP0280444A1 Electromagnetic contactor with lightweight wide range current transducer |
| 08/24/1988 | EP0279596A1 Electromagnetic contactor with lightweight wide range current transducer with sintered powdered metal core |
| 08/24/1988 | CN87208101U Power-saving voltage regulating device for domestic electric appliance |
| 08/23/1988 | US4766365 Self-regulated transformer-inductor with air gaps |
| 08/16/1988 | US4764744 Overload relay having adjustably gapped current transformers |
| 08/10/1988 | EP0277716A1 A variable transformer |
| 08/10/1988 | CN87214843U High-reliability domestic voltage regulator for overvoltage |
| 08/03/1988 | CN87215594U Track-transformer for ac continuous type rail circuit |
| 08/03/1988 | CN87205511U Reactance variable type stepless voltage regulator |
| 08/02/1988 | US4761628 Electromagnetic induction apparatus with tap winding conductors |
| 07/28/1988 | DE3700818A1 Constant-voltage transformer with dual function |
| 07/20/1988 | CN87202961U No-load excitating constant-current voltage-regulator without contact point |
| 07/14/1988 | WO1988005208A1 Thyristor drive for an on-load change-over switch |
| 07/13/1988 | CN87208303U Auto-coupling voltage regulator |
| 07/13/1988 | CN85103560B Three-phase saturating reactor with seven legged laminated core |
| 07/12/1988 | CA1239189A1 Circuit arrangement for large power transformers |
| 06/29/1988 | CN86102005B Duplex-direction on load voltage regulating method and relevant device |
| 05/26/1988 | DE3640235A1 Ferromagnetic energy converter |
| 04/20/1988 | CN87208669U Automatic voltage regulator |
| 04/20/1988 | CN86102505A Magnetic controlled voltage regulator |
| 03/24/1988 | DE3716415A1 Rectifier circuit having a storage inductor which is connected to the load circuit to smooth the pulsating load currents on the output side by means of its load winding |
| 03/17/1988 | DE3630415A1 Transformer which is constructed as a tapped transformer and is insulated with cast resin |
| 03/10/1988 | WO1988001791A1 Magnetic material biasing method and apparatus |
| 03/10/1988 | DE3630464A1 Contact arrangement for load selectors of tapped transformers |
| 03/09/1988 | CN87104029A Transformer tap chan |
| 03/02/1988 | EP0257291A1 Circuit arrangement for the wiring of high power transformers |
| 03/02/1988 | EP0257239A2 Tap changer for mounting in a cylindrical casing |
| 02/03/1988 | EP0254946A1 A single phase auto transformer |
| 01/27/1988 | CN87104614A Load selector with preselector for transtat |
| 01/20/1988 | CN87203036U Buffer for loaded switch |
| 01/20/1988 | CN87202971U Contactless self-coupling voltage regulator without air gas partial flow |
| 01/13/1988 | EP0252400A2 Tap selector for tapped transformers equipped with a preliminary selector |
| 01/06/1988 | CN87203040U Instrument of lowing blasting-stock of vacuum loading switch |
| 01/06/1988 | CN87203039U Air vacuum loaded shunting switch |
| 12/31/1987 | CN87203901U Adjustable reactor for breaking down test of generator |
| 12/31/1987 | CN87201053U Self-coupling transformer with sectional output |
| 12/31/1987 | CN87201052U Compound self-coupling transformer |
| 12/09/1987 | EP0248223A1 Transformer tap changer |
| 12/09/1987 | CN86103586A Dual tunning low energy consumption filtering device and method |
| 12/02/1987 | CN87200839U Induction type contact voltage regulator |
| 11/25/1987 | EP0246377A1 Electrically-variable inductor |
| 11/17/1987 | CA1229381A1 Self-controlled variable inductance with gaps |
| 11/04/1987 | CN86102795A Gyromagnetic regulating method and gyromagnetic regulating transformer |
| 09/15/1987 | US4694241 Transformer tap changer |
| 09/15/1987 | US4694140 AC power supply |
| 09/02/1987 | EP0233903A1 Inductive, electrically-controllable component |
| 09/02/1987 | CN86207575U Voltage regulator with reset switch |
| 08/25/1987 | CA1226025A1 Switch mechanism for transformer |
| 08/19/1987 | EP0232490A2 Electromagnetically actuated high DC current switch |
| 08/19/1987 | CN86209354U Contact voltage regulator of mutual reactance |