Patents by Inventor Rudolf Fehringer
Rudolf Fehringer 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: 11480629Abstract: An electronic determination device for determining at least one characteristic parameter of a connection set connected between a converter and an electric machine; the converter comprising at least two output terminals and, for each output terminal, a switching branch including at least one converter switch; the connection set comprising a filter connected to the output terminals and a cable connected between the filter and the electric machine; the filter including, for each output terminal, a respective electromagnetic coil connected to said output terminal and a respective capacitor connected to said coil; the determination device comprising: for each output terminal, a device switch configured to be connected to the respective capacitor; a generation module configured to generate a voltage pulse through the connection set, by controlling the converter switches and each device switch; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) through the filter, furType: GrantFiled: November 10, 2020Date of Patent: October 25, 2022Assignee: Schneider Toshiba Inverter Europe SASInventors: Hocine Boulharts, Rudolf Fehringer, Mehdi Messaoudi
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Publication number: 20210141032Abstract: An electronic determination device for determining at least one characteristic parameter of a connection set connected between a converter and an electric machine; the converter comprising at least two output terminals and, for each output terminal, a switching branch including at least one converter switch; the connection set comprising a filter connected to the output terminals and a cable connected between the filter and the electric machine; the filter including, for each output terminal, a respective electromagnetic coil connected to said output terminal and a respective capacitor connected to said coil; the determination device comprising: for each output terminal, a device switch configured to be connected to the respective capacitor; a generation module configured to generate a voltage pulse through the connection set, by controlling the converter switches and each device switch; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) through the filter, furType: ApplicationFiled: November 10, 2020Publication date: May 13, 2021Applicant: Schneider Toshiba Inverter Europe SASInventors: Hocine BOULHARTS, Rudolf FEHRINGER, Mehdi MESSAOUDI
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Patent number: 10476355Abstract: The invention relates to a method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said method consisting in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor so as to minimize an overvoltage level, said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1?n, and the method includes the following steps in particular: determining the number of successive pulses of said sequence; determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).Type: GrantFiled: February 4, 2019Date of Patent: November 12, 2019Assignee: Schneider Toshiba Inverter Europe SASInventors: Hocine Boulharts, Rudolf Fehringer
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Publication number: 20190252951Abstract: The invention relates to a method for controlling a converter connected to an electric machine by a cable (Cx) via a filter (F), said method consisting in determining at least one sequence of a plurality of voltage pulses forming a square wave signal to be applied to each conductor so as to minimize an overvoltage level, said sequence comprising a number 2N of successive pulses, N being greater than or equal to 1, each pulse being defined by a distinct rank n, said sequence being generated such that each increasing voltage pulse of rank n exhibits a pulse width that is identical to that of a decreasing voltage pulse of rank equal to 2N+1?n, and the method includes the following steps in particular: determining the number of successive pulses of said sequence; determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).Type: ApplicationFiled: February 4, 2019Publication date: August 15, 2019Applicant: Schneider Toshiba Inverter Europe SASInventors: Hocine BOULHARTS, Rudolf FEHRINGER
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Patent number: 9853569Abstract: The invention relates to a method for actuating inverter stages (2) switched in parallel, wherein each inverter stage (2) comprises several switching elements (3) with two switching states each. In accordance with the invention, the actuation of the inverter stages (2) occurs via a central control unit (6) which is connected to each inverter stage (2) via a serial data transmission path (5). Measures are proposed for transmitting the selected switching states from the central control unit (6) to the respective inverter stage (2) in order to ensure secure operation of the inverter stages (2) over a plurality of switching processes on the one hand and to reliably prevent functional impairments of the switching elements (3) by erroneous actuation, but to also carry out the actuation of the switching elements (3) of the inverter stages (2) in a sufficiently rapid way on the other hand in order to avoid impairing the quality of the output current formed by the inverter stage (2).Type: GrantFiled: December 18, 2014Date of Patent: December 26, 2017Assignee: SCHNEIDER ELECTRIC POWER DRIVES GMBHInventors: Rudolf Fehringer, Gerhard Lehner
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Patent number: 9509241Abstract: A control method used in a control unit of a power converter, connected by three output phases to a synchronous electric motor, the method being used for starting the motor and including a first step for determining the voltages to be applied to the output phases depending on a reference current, a second step for determining a frequency to be applied to the stator depending on a stator frequency, a step for application of the first step and the second step for a given duration, so as to allow the rotor of the synchronous electric motor to rotate at the stator frequency applied. The method is particularly effective for an architecture including a transformer and a sinus filter between the power converter and the electric motor.Type: GrantFiled: June 12, 2015Date of Patent: November 29, 2016Assignee: SCHNEIDER TOSHIBA INVERTER EUROPE SASInventors: Francois Malrait, Thomas Devos, Rudolf Fehringer
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Publication number: 20160308463Abstract: The invention relates to a method for actuating inverter stages (2) switched in parallel, wherein each inverter stage (2) comprises several switching elements (3) with two switching states each. In accordance with the invention, the actuation of the inverter stages (2) occurs via a central control unit (6) which is connected to each inverter stage (2) via a serial data transmission path (5). Measures are proposed for transmitting the selected switching states from the central control unit (6) to the respective inverter stage (2) in order to ensure secure operation of the inverter stages (2) over a plurality of switching processes on the one hand and to reliably prevent functional impairments of the switching elements (3) by erroneous actuation, but to also carry out the actuation of the switching elements (3) of the inverter stages (2) in a sufficiently rapid way on the other hand in order to avoid impairing the quality of the output current formed by the inverter stage (2).Type: ApplicationFiled: December 18, 2014Publication date: October 20, 2016Applicant: SCHNEIDER ELECTRIC POWER DRIVES GMBHInventors: Rudolf FEHRINGER, Gerhard LEHNER
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Patent number: 9444362Abstract: The present invention relates to a rectifier circuit with a three-phase rectifier arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement (1) comprises a three-phase mains input (3) and a DC output (4), and at least one of the three phases (U, V, W) at the mains input (3) is connected to a first pole connection (A) of a three-pole circuit (5) for diverting an injection current (ih3) into the three-pole circuit (5).Type: GrantFiled: February 22, 2013Date of Patent: September 13, 2016Assignee: Schneider Electric Power Drives GmbHInventors: Michael Hartmann, Rudolf Fehringer
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Publication number: 20150381088Abstract: A control method used in a control unit of a power converter, connected by three output phases to a synchronous electric motor, the method being used for starting the motor and including a first step for determining the voltages to be applied to the output phases depending on a reference current, a second step for determining a frequency to be applied to the stator depending on a stator frequency, a step for application of the first step and the second step for a given duration, so as to allow the rotor of the synchronous electric motor to rotate at the stator frequency applied. The method is particularly effective for an architecture including a transformer and a sinus filter between the power converter and the electric motor.Type: ApplicationFiled: June 12, 2015Publication date: December 31, 2015Applicant: Schneider Toshiba Inverter Europe SASInventors: Francois MALRAIT, Thomas DEVOS, Rudolf FEHRINGER
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Publication number: 20150029771Abstract: The present invention relates to a rectifier circuit with a three-phase rectifier arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement (1) comprises a three-phase mains input (3) and a DC output (4), and at least one of the three phases (U, V, W) at the mains input (3) is connected to a first pole connection (A) of a three-pole circuit (5) for diverting an injection current (ih3) into the three-pole circuit (5).Type: ApplicationFiled: February 22, 2013Publication date: January 29, 2015Applicant: Schneider Electric Power Drives GmbHInventors: Michael Hartmann, Rudolf Fehringer
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Patent number: 5726514Abstract: The invention concerns a transverse-flux machine whose stator features a winding with a first phase and a second phase. The windings of the first phase and the windings of the second phase are divided in two component windings each. The first component winding of the first phase is wired in series with the second component winding of the second phase, while the second component winding of the first phase is wired in series with the first component winding of the second phase.Type: GrantFiled: November 21, 1996Date of Patent: March 10, 1998Assignee: Voith Turbo GmbH & Co. KGInventors: Johann Wurz, Rudolf Fehringer
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Patent number: 5485072Abstract: A method and apparatus is provided for operating a permanently excited single-phase alternating current machine, otherwise known as a transverse flux machine, which allows optimal exploitation of the machine and economical design of the converter. A terminal voltage is applied to the machine, the shape of which is defined by the characteristics of the machine. The waveform of the terminal voltage converts from a sinusoid to a square wave, with a maximum voltage equal to the maximum available voltage, at defined switch-over times. Based on the switch over times, the resulting terminal voltage wave can be square, completely sinusoidal, or a combination of both.Type: GrantFiled: November 3, 1993Date of Patent: January 16, 1996Assignee: J. M. Voith Gesellschaft M. B. H.Inventor: Rudolf Fehringer