H01F 29 - Variable transformers or inductances not covered by group

Patents for H01F 29 - Variable transformers or inductances not covered by group (3,889)
12/2009
12/16/2009	CN201362598Y Serial-connected control loop of polysilicon reduction power supply silicon rod
12/16/2009	CN101604573A Excitation-free conversion voltage regulation tap switch
12/16/2009	CN100570767C Controlled reactor with compensation winding
12/16/2009	CN100570766C External electric supply controllable reactor
12/16/2009	CN100570765C Self-feeding controllable transductor
12/10/2009	WO2009146579A1 A magnetic filter and a butt method between a yoke and an iron stud of the magnetic filter
12/09/2009	CN201359917Y Double-track cam disc
12/09/2009	CN201359916Y Parallel connection structure of horn contacts
12/09/2009	CN201359915Y Vacuum tube switch core of on-load tap switch
12/09/2009	CN201359914Y Upper splint with composite structure
12/09/2009	CN201359913Y On-load tap switch with phase-controlled permanent magnet mechanism
12/09/2009	CN201359912Y Lever drive mechanism of vacuum tube
12/09/2009	CN201359911Y Voltage and capacitance regulating transformer with two switches
12/09/2009	CN201359910Y Rotating-core voltage regulator contact group
12/09/2009	CN101599354A Transformer
12/09/2009	CN100568414C High-voltage transformer
12/03/2009	DE102008064640A1 Induktivität und Anordnung Inductance and arrangement
12/03/2009	DE102008024602A1 Controllable inductance optionally used in non-contacting, medium power transmission system, includes main winding and control windings on core with air gap
12/02/2009	CN101593617A Oil-immersed type single-phase step-up transformer
12/02/2009	CN101593615A Control device for operation of on-load tap changer and control method thereof
11/2009
11/25/2009	CN201352491Y Adjustable magnetic hollow filter reactor
11/25/2009	CN101587772A Shifting coil adjustable reactor
11/25/2009	CN101587765A A rotating electric component
11/25/2009	CN100562952C Transformer for switching power supply
11/19/2009	WO2009137908A1 Voltage regulation system
11/19/2009	CA2724382A1 Voltage regulation system
11/17/2009	CA2174568C Interconnection system for transmitting power between electrical systems
11/12/2009	WO2009136879A1 The digital transformer
11/11/2009	CN201345290Y Load tap-changing switch
11/11/2009	CN201345289Y Single-phase double-on load voltage regulating transformer
11/11/2009	CN101577174A MEMS adjustable inductor of static driving conductor thin film and manufacturing method thereof
11/04/2009	CN201340790Y Annular movable contact no-excitation tap-changer
11/04/2009	CN201340789Y Transformer tap regulator
11/04/2009	CN201340788Y Rock electric drill transformer with voltage being adjustable
10/2009
10/29/2009	WO2009094541A3 Generating electromagnetic forces with flux feedback control
10/28/2009	CN101567253A Annular compensating voltage regulator connected in series
10/22/2009	DE102008048018B3 Handantrieb Hand drive
10/21/2009	CN201332008Y Amorphous alloy on-load variac
10/21/2009	CN201332007Y Amorphous alloy on-load voltage regulation transformer
10/21/2009	CN201332006Y Star/ angle conversion coil adopting M type tapping switch
10/20/2009	CA2461326C Systems and methods for driving large capacity ac motors
10/14/2009	CN201327770Y High-frequency transformer for electric welding
10/14/2009	CN201327765Y High-frequency transformer for electric welding device
10/14/2009	CN100550224C Loaded capacity and pressure regulating switch for transformer
10/08/2009	WO2009121143A1 A fault current limiter
10/08/2009	CA2705347A1 A fault current limiter
10/07/2009	EP2107861A1 Switching device for reducing voltage
10/07/2009	CN201323125Y On-load voltage-regulation dry-type voltage-transformation device
10/07/2009	CN101552114A Application method of tapping switch adopting M type in star/angle conversion coil
10/07/2009	CN101552113A Net mouth transformer device
10/07/2009	CN101552112A Adjustable iron-core reactor
10/07/2009	CN101552102A Coil structure of on-load voltage regulation and reduction transformer
09/2009
09/29/2009	CA2488314C Power source for high current welding
09/23/2009	CN201315233Y Adjustable inductor for pulse forming network
09/23/2009	CN201315232Y Body structure of three-winding on-load voltage regulating step-down transformer
09/23/2009	CN101540227A Center tapped transformer
09/16/2009	CN201311835Y Dry-type transformer with tapping gear protective device
09/16/2009	CN101533708A Iron core for rotary-core voltage regulators
09/16/2009	CN101533707A Contact set for rotary-core voltage regulators
09/09/2009	CN201307504Y Multi-carbon brush voltage regulator
09/03/2009	WO2009107130A1 Power system for air conditioning systems
09/03/2009	WO2009105932A1 External-hanging type combined on-load tap-changer
09/03/2009	WO2009105931A1 Movable contact of tap changer
09/03/2009	DE202004021635U1 System zum Verbinden einer demontierbaren Spule mit feststehenden Spulenanschlusskontakten System for connecting a detachable coil with fixed coil terminal contacts
09/02/2009	CN201302915Y Multi-functional transformer
09/02/2009	CN101521098A On-load tap-changing dry type transformer
09/02/2009	CN101521097A Composite vacuum arc-extinguishing on-load voltage regulation switch of power transformer
09/01/2009	US7583166 Inductor Q factor enhancement apparatus has bias circuit that is coupled to negative resistance generator for providing bias signal
08/2009
08/26/2009	CN201298445Y Non-excitation tapping switch convenient for shifting
08/26/2009	CN201298444Y Polycrystalline variable-current transformer
08/26/2009	CN201298443Y Rotating center voltage regulator iron core
08/26/2009	CN201298442Y Capacitance-adjustable electric power transformer
08/26/2009	CN201298441Y Voltage stabilizing transformer
08/26/2009	CN201298420Y Current regulator for welding machine
08/19/2009	EP2091054A2 An electromagnetic current limiter device
08/19/2009	CN201294153Y Hollow reactor
08/19/2009	CN201293543Y Large-capacity direct-current graphitization electric furnace apparatus
08/19/2009	CN101510462A Superhigh tension power transformer
08/19/2009	CN100530459C Excitation-free positive-negative voltage-regulation tap changer
08/13/2009	DE102008036006B3 Handantrieb Hand drive
08/12/2009	EP2088603A2 Shunt reactor
08/12/2009	CN201289785Y Dry transformer capable of adapting various voltage power transmission electric network
08/12/2009	CN201287244Y Covered arc welding, argon arc welding and three-operating integral welding equipment of plasma cutting
08/12/2009	CN101506922A Electric motor drive unit for on-load tap-changers
08/12/2009	CN101506913A A resistor for electric high-voltage apparatus and a method of mounting a resistor
08/11/2009	US7573000 Power source for plasma device
08/06/2009	WO2009096816A1 Transformer-type controllable reactor
08/05/2009	CN201285695Y Delta connection tap switch for underground transformer
08/05/2009	CN201285694Y Tapping switch sealing cover for underground transformer
08/05/2009	CN201285691Y Shifting coil type compensation transformer
08/05/2009	CN101499373A Magnetic modulating method and apparatus of hollow filter reactor
07/2009
07/30/2009	WO2009094541A2 Generating electromagnetic forces with flux feedback control
07/22/2009	CN201278308Y Stepless adjustable reactor for illumination electricity-saving
07/22/2009	CN201278307Y Loaded switch hanging rack
07/16/2009	WO2009089261A1 Electrically variable inductor, associated tunable filter and methods
07/16/2009	CA2711310A1 Electrically variable inductor, associated tunable filter and methods
07/15/2009	EP1325394B1 Wide ratio autotransformer-type current ranging
07/15/2009	CN201274230Y Pressure regulator
07/08/2009	CN201270192Y Non-exciting shunting switch for positive and negative voltage regulating
07/08/2009	CN201270191Y Dry type converter transformer for polycrystalline silicon reduction furnace and hydrogenation furnace

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