Patents by Inventor Udo Fromm
Udo Fromm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7759910Abstract: A high voltage AC transmission cable system for transmitting power between two points, each connected to one or more power networks, and a method to operate the system. At least one transformer is arranged at each end of the AC transmission cable, wherein at least one of the transformers is arranged to operate the transformer at a voltage whereby losses due to reactive power transport and dielectric losses are minimized. The AC cable is run at a variable voltage regulated such that the voltage is a function of the load for the transmission cable. This operating voltage is not necessarily the same as the nominal voltages in the connection points. A control and communication system and a graphical user interface for carrying out the method are also provided.Type: GrantFiled: September 13, 2004Date of Patent: July 20, 2010Assignee: ABB Research Ltd.Inventors: Sture Lindahl, Kenneth Johansson, Udo Fromm, Stefan Johansson
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Patent number: 7554431Abstract: An induction device having windings of different phases arranged around magnetic core limbs. The magnetic core limbs are connected by at least one body formed from magnetic particles in a matrix of a dielectric material.Type: GrantFiled: October 19, 2005Date of Patent: June 30, 2009Assignee: ABB ABInventors: Mikael Dahlgren, Udo Fromm, Gunnar Russberg, Christian Sasse, Anders Eriksson, Tomas Jonsson, Svante Soderholm
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Patent number: 7259491Abstract: A rotating asynchronous converter and a generator device having a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter has a rotor which rotates in dependence of the first and second frequencies f1, f2. The stators each have at least one winding formed of at least one current-carrying conductor, and an insulation system, formed of semiconducting layers each forming an equipotential surface, and a solid insulation between the semiconducting layers.Type: GrantFiled: March 30, 2005Date of Patent: August 21, 2007Assignee: ABB ABInventors: Mats Leijon, Thorsten Shütte, Christian Sasse, Udo Fromm, Stefan G. Johansson
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Publication number: 20070114978Abstract: A high voltage AC transmission cable system for transmitting power between two points, each connected to one or more power networks, and a method to operate the system. At least one transformer is arranged at each end of the AC transmission cable, wherein at least one of the transformers is arranged to operate the transformer at a voltage whereby losses due to reactive power transport and dielectric losses are minimized. The AC cable is run at a variable voltage regulated such that the voltage is a function of the load for the transmission cable. This operating voltage is not necessarily the same as the nominal voltages in the connection points. A control and communication system and a graphical user interface for carrying out the method are also provided.Type: ApplicationFiled: September 13, 2004Publication date: May 24, 2007Applicant: ABB RESEARCH LTDInventors: Sture Lindahl, Kenneth Johansson, Udo Fromm, Stefan Johansson
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Patent number: 7088027Abstract: The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter also comprises a rotor means which rotates in dependence of the first and second frequencies f1, f2. The stators each comprises at least one winding, wherein each winding comprises at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.Type: GrantFiled: February 7, 2005Date of Patent: August 8, 2006Assignee: ABB ABInventors: Mats Leijon, Thorsten Schütte, Christian Sasse, Udo Fromm
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Patent number: 7046492Abstract: A power transformer/inductor includes at least one winding. The winding is made of a high voltage cable that includes an electric conductor, and around the electric conductor is arranged a first semiconducting layer, around the first semiconducting layer is an insulating layer, and around the insulating layer is a second semiconducting layer. The second semiconducting layer is directly earthed at both ends of the winding and furthermore at least at two points per turn of every winding such that one or more points are indirectly earthed.Type: GrantFiled: December 20, 2004Date of Patent: May 16, 2006Assignee: ABB ABInventors: Udo Fromm, Sven Hornfeldt, Par Holmberg, Gunnar Kylander, Li Ming, Mats Leijon
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Publication number: 20060087393Abstract: An induction device having windings of different phases arranged around magnetic core limbs. The magnetic core limbs are connected by at least one body formed from magnetic particles in a matrix of a dielectric material.Type: ApplicationFiled: October 19, 2005Publication date: April 27, 2006Applicant: ABB ABInventors: Mikael Dahlgren, Udo Fromm, Gunnar Russberg, Christian Sasse, Anders Eriksson, Tomas Jonsson, Svante Soderholm
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Patent number: 6995646Abstract: A power or regulating transformer with voltage regulator includes regulating windings made of a flexible conductor having an electric field containing mechanism that forces the electric field due to the current in the winding to be contained within the flexible conductor. Since virtually no electric field is to be found outside the flexible conductor of the regulating winding, the regulating winding may be formed without having to consider the electric field distribution, thus providing for a transformer with a favorable regulating winding design.Type: GrantFiled: February 2, 1998Date of Patent: February 7, 2006Assignee: ABB ABInventors: Udo Fromm, Par Holmberg, Albert Jaksts, Mats Leijon, Christian Sasse, Thorsten Schutte
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Publication number: 20060006755Abstract: A rotating asynchronous converter and a generator device having a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter has a rotor which rotates in dependence of the first and second frequencies f1, f2. The stators each have at least one winding formed of at least one current-carrying conductor, and an insulation system, formed of semiconducting layers each forming an equipotential surface, and a solid insulation between the semiconducting layers.Type: ApplicationFiled: March 30, 2005Publication date: January 12, 2006Inventors: Mats Leijon, Thorsten Schutte, Christian Sasse, Udo Fromm, Stefan Johansson
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Patent number: 6970063Abstract: The present invention relates to a power transformer/inductor comprising at least one winding. The windings are designed by means of a high-voltage cable, comprising an electric conductor, and around the conductor there is arranged a first semiconducting layer, around the first semiconducting layer there is arranged an insulating layer and around the insulating layer there is arranged a second semiconducting layer. The second semiconducting layer is earthed at or in the vicinity of both ends (261, 262; 281, 282) of each winding and furthermore one point between both ends (261, 262; 281, 282) is directly earthed.Type: GrantFiled: February 2, 1998Date of Patent: November 29, 2005Assignee: ABB ABInventors: Udo Fromm, Sven Hornfeldt, Par Holmberg, Gunnar Kylander, Li Ming, Mats Leijon
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Publication number: 20050127773Abstract: The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter also comprises a rotor means which rotates in dependence of the first and second frequencies f1, f2. The stators each comprises at least one winding, wherein each winding comprises at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.Type: ApplicationFiled: February 7, 2005Publication date: June 16, 2005Inventors: Mats Leijon, Thorsten Schutte, Christian Sasse, Udo Fromm
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Patent number: 6906447Abstract: A rotating asynchronous converter for connection of AC network with equal or different frequencies employs a first stator connected to a first AC network with a first frequency and a second stator connected to a second AC network with a second frequency, and a rotor which rotates in response to the first and second frequencies. The converter has at least one winding formed of a cable, including a conductor and a magnetically permeable, electric field confining insulating covering surrounding the conductor.Type: GrantFiled: May 27, 1997Date of Patent: June 14, 2005Assignee: ABB ABInventors: Mats Leijon, Thorsten Schütte, Christian Sasse, Udo Fromm
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Patent number: 6897749Abstract: A superconducting magnetic energy storage (SMES) device including a first coil made of superconducting material, a cooling mechanism for cooling the first coil to superconducting temperatures, a second coil inductively coupled to the first coil for inputting emergy to, and/or outputting energy from, the first coil, and a switch for switching the first coil between a superconducting condition and a non-superconducting condition. The first coil is arranged as a closed loop electric circuit having no connecting device mechanically connected to it for inputting or outputting energy. The switch includes a third coil for the application or removal of a magnetic field for switching the first coil between its non-superconducting and superconducting conditions. A method inputs energy to and/or outputs energy from the first coil and a power supply system utilizes the device and method.Type: GrantFiled: June 4, 2001Date of Patent: May 24, 2005Assignee: ABB ABInventors: Tomas Jonsson, Karin Thorburn, Udo Fromm, Peter Hessling, Arne Gustafsson, Christian Sasse, Pan Min, Mikael Dahlgren
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Publication number: 20050099258Abstract: A power transformer/inductor includes at least one winding. The winding is made of a high voltage cable that includes an electric conductor, and around the electric conductor is arranged a first semiconducting layer, around the first semiconducting layer is an insulating layer, and around the insulating layer is a second semiconducting layer. The second semiconducting layer is directly earthed at both ends of the winding and furthermore at least at two points per turn of every winding such that one or more points are indirectly earthed.Type: ApplicationFiled: December 20, 2004Publication date: May 12, 2005Applicant: ASEA BROWN BOVERI ABInventors: Udo Fromm, Sven Hornfeldt, Par Holmberg, Gunnar Kylander, Li Ming, Mats Leijon
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Publication number: 20050030140Abstract: An induction device, such as a transformer or reactor, which includes windings of different phases arranged around magnetic core limbs. The magnetic core limbs are connected by at least one body formed from magnetic particles in a matrix of a dielectric material. The device can also be substantially spherical or cylindrical. Regulating windings mounted on inner and outer magnetic core parts may be transferable between the inner and outer magnetic core parts.Type: ApplicationFiled: April 2, 2001Publication date: February 10, 2005Inventors: Mikael Dahlgren, Udo Fromm, Gunnar Russberg, Christian Sasse, Anders Eriksson, Tomas Jonsson, Svante Soderholm
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Patent number: 6801421Abstract: A high power static electromagnetic device with a flux path, a main winding and one or more regulation windings surrounding portions of the flux path. A control device is coupled to the flux path for selectively admitting the flux therein. In an exemplary embodiment, multiple flux paths are selectively turned on and off for including and excluding the regulation windings from the circuit. The windings may be formed of a magnetically permeable, field-confining insulating cable.Type: GrantFiled: September 29, 1998Date of Patent: October 5, 2004Assignee: ABB ABInventors: Christian Sasse, Mats Leijon, Gunnar Russberg, Udo Fromm, Par Holmberg
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Publication number: 20040114403Abstract: A superconducting magnetic energy storage (SMES) device (1) comprising a first coil (2) made of superconducting material, cooling means (3) for cooling the first coil to superconducting temperatures, a second coil (4) inductively coupled to the first coil (2) for inputting energy to, and/or outputting energy from, the first coil (2), and switching means (5) for switching the first coil (2) between a superconducting condition and a non-superconducting condition. The first coil (2) is arranged as a closed loop electric circuit having no connecting means mechanically connected to it for inputting or outputting energy. The switching means (5) comprises a third coil for the application or removal of a magnetic field for switching the first coil (2) between its non-superconducting and superconducting conditions. The invention also relates to a method of inputting energy to and/or outputting energy from the first coil (2) and to a power supply system.Type: ApplicationFiled: August 25, 2003Publication date: June 17, 2004Inventors: Tomas Jonsson, Karin Thorburn, Udo Fromm, Peter Hessling, Arne Gustafsson, Christian Sasse, Pan Min, Mikael Dahlgren
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Patent number: 6432524Abstract: An electrode for control of an electric field strength in a gaseous electrically insulating medium at the surface of the electrode and in the vicinity of the electrode, comprising an electrically conducting inner electrode (1′) and an electrically non-conducting layer (8) on at least parts of the surface of the inner electrode, wherein the thickness of the non-conducting layer is at least 5% of the mean diameter of the inner electrode and that the relative dielectric constant of the non-conducting layer is smaller than 3.Type: GrantFiled: July 9, 1999Date of Patent: August 13, 2002Assignee: ABB Research Ltd.Inventors: Udo Fromm, Mats Leijon, Li Ming, Dan Windmar
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Publication number: 20010055217Abstract: The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter also comprises a rotor means which rotates in dependence of the first and second frequencies f1, f2. The stators each comprises at least one winding, wherein each winding comprises at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.Type: ApplicationFiled: April 10, 1998Publication date: December 27, 2001Inventors: MATS LEIJON, THORSTEN SCHUTTE, CHRISTIAN SASSE, UDO FROMM
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Publication number: 20010019494Abstract: The present invention relates to a DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding. The winding comprises at least one current-carrying conductor. Each winding comprises also an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.Type: ApplicationFiled: November 28, 1997Publication date: September 6, 2001Inventors: MATS LEIJON, UDO FROMM, ALBERT JAKSTS, MING LI, CHRISTIAN SASSE