Patents by Inventor Mehanathan Pathmanathan
Mehanathan Pathmanathan 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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Publication number: 20240039345Abstract: There is described a wireless power transfer system utilizing a new excitation-quadrature-quadrature transmitter pad which includes one excitation coil and at least two decoupled quadrature auxiliary coils. A described resonant tank design method is proposed for constant-current charging and zero phase angle conditions. When there is a lateral misalignment in the receiver pad, the auxiliary coil that is better coupled with the receiver pad conducts more current than the more distant auxiliary coil does, reducing the leakage magnetic field in the surrounding area and/or improving transmission efficiency.Type: ApplicationFiled: February 9, 2022Publication date: February 1, 2024Inventors: Zhichao LUO, Shuang NIE, Mehanathan PATHMANATHAN, Peter Waldemar LEHN
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Publication number: 20240010076Abstract: A dual inverter drivetrain having an energy storing fuel cell integrated into an electric vehicle is disclosed. A method of operating the dual inverter drivetrain using a power sharing control approach is described, which allows the key requirements of a fuel cell to be achieved without compromising the dynamic performance of the electric vehicle drive system. In particular, the ability of this control approach to ensure unidirectional power transfer from the fuel cell even in the event of regenerative braking, and a slowly changing fuel cell power despite fast motor torque transients were exhibited.Type: ApplicationFiled: December 16, 2021Publication date: January 11, 2024Inventors: Peter Waldemar LEHN, Mehanathan PATHMANATHAN, Sepehr SEMSAR, Caniggia Castro Diniz VIANA
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Publication number: 20230246560Abstract: An approach for controlling operation of an electrically symmetrical electric power circuit is described herein to reduce common mode leakage currents. The approach can include, for example, a controller circuit configured to control a plurality of switches of the electrically symmetrical electric power circuit, such that one or more electrically symmetrical pairs of switches of the plurality of switches are operated at a same operational state when the power circuit is coupled to an electrical grid to reduce the common mode leakage current. A variant is also described that is adapted for current ripple and overall THD distortion reduction, which can be useful for vehicle to grid power transfer situations.Type: ApplicationFiled: June 24, 2021Publication date: August 3, 2023Inventors: Peter Waldemar LEHN, Caniggia CASTRO DINIZ VIANA, Sepehr SEMSAR, Mehanathan PATHMANATHAN
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Publication number: 20210273590Abstract: A method of performing de-excitation of a brushless synchronous machine having a stator; and a rotor including: a field winding, an exciter armature, a rectifier having thyristors, the rectifier having input terminals connected to the exciter armature and output terminals connected to the field winding, a field discharge resistor connected in series with the field winding, and a bypass switch connected in parallel with the field discharge resistor, the bypass switch being operable between a closed state in which the field discharge resistor is bypassed, and an open state, wherein the method including: a) controlling the thyristors to fire only during a negative half-cycle of the armature voltage waveforms, and b) controlling the bypass switch to obtain the open state from the closed state to thereby discharge a field winding current through the field discharge resistor.Type: ApplicationFiled: April 5, 2019Publication date: September 2, 2021Inventors: Mehanathan Pathmanathan, Pedro Rodriguez, Chenjie Lin, Ghanshyam Shrestha, Tuomas Janhunen, Pasi Paloheimo
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Patent number: 10840833Abstract: A commutation circuit includes a coil connected to an H bridge, the H bridge including four main switches for reversing polarity and a resulting coil current in the coil. The commutation circuit further includes a voltage source configured to generate a bypass current, and at least one auxiliary switch for controlling the bypass current to thereby decrease a switch current through at least one of the main switches. By generating an appropriate bypass current with help of a voltage source, a switch current through a desired main switch in a leading state can be decreased and eventually brought to zero. Zero current in its turn enables the use of thyristors as main switches as it results in the thyristors to be turned off automatically. Furthermore, decreased switch current at the switching moment reduces switching losses even in different types of switches such as GTOs and IGBTs.Type: GrantFiled: March 31, 2015Date of Patent: November 17, 2020Assignee: ABB Schweiz AGInventors: Sjoerd Bosga, Veli-Matti Leppanen, Mehanathan Pathmanathan, Robert Chin, Yujing Liu
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Patent number: 10790733Abstract: Unique systems, methods, techniques and apparatuses of exciterless synchronous machines are disclosed. One exemplary embodiment is a fractional slot synchronous machine comprising a rotor including a first pole pair including a first pole including a first plurality of slots having a first center point and arranged on a first outer surface in a slot pattern; a second pole pair including a second pole including a second plurality of slots having a second center point and arranged on a second outer surface in the slot pattern; energy harvest windings arranged in a winding pattern within a portion of the first plurality of slots and arranged in the same winding pattern within a portion of the second plurality of slots, the energy harvest winding being structured to receive a harmonic power from the stator; and a rectifier structured to receive the harmonic power from the energy harvest winding.Type: GrantFiled: September 4, 2018Date of Patent: September 29, 2020Assignee: ABB Schweiz AGInventors: Chenjie Lin, Ghanshyam Shrestha, Mehanathan Pathmanathan, Pedro Rodriguez, Jan Mikael Westerlund, Tuomas Janhunen
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Patent number: 10700578Abstract: Unique systems, methods, techniques and apparatuses of an exciterless synchronous generator are disclosed. One exemplary embodiment is an exciterless synchronous generator comprising a stator, a rotor, and a startup excitation system. The stator includes a set of stator windings. The rotor includes an energy harvest winding, a DC power supply including a DC bus and coupled to the energy harvest winding, and a field winding coupled to the DC power supply. The startup excitation system comprises one of a magnetic field generation system structured to generate a magnetic field received by the energy harvest winding in response to a rotation of the rotor, wherein the magnetic field is converted to DC power with the DC power supply and transmitted to the field winding; or a rotor DC power source including and diode coupled in series across the DC bus.Type: GrantFiled: December 29, 2017Date of Patent: June 30, 2020Assignee: ABB Schweiz AGInventors: Ghanshyam Shrestha, Chenjie Lin, Mehanathan Pathmanathan, Pedro Rodriguez
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Publication number: 20200076286Abstract: Unique systems, methods, techniques and apparatuses of exciterless synchronous machines are disclosed. One exemplary embodiment is a fractional slot synchronous machine comprising a rotor including a first pole pair including a first pole including a first plurality of slots having a first center point and arranged on a first outer surface in a slot pattern; a second pole pair including a second pole including a second plurality of slots having a second center point and arranged on a second outer surface in the slot pattern; energy harvest windings arranged in a winding pattern within a portion of the first plurality of slots and arranged in the same winding pattern within a portion of the second plurality of slots, the energy harvest winding being structured to receive a harmonic power from the stator; and a rectifier structured to receive the harmonic power from the energy harvest winding.Type: ApplicationFiled: September 4, 2018Publication date: March 5, 2020Inventors: Chenjie Lin, Ghanshyam Shrestha, Mehanathan Pathmanathan, Pedro Rodriguez, Jan Mikael Westerlund, Tuomas Janhunen
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Patent number: 10581357Abstract: Unique systems, methods, techniques and apparatuses of a rotating DC power supply are disclosed. One exemplary embodiment includes a first and second DC bus rail, a first and second leg, and a discharge resistor. The first leg includes a first semiconductor device and a second semiconductor device coupled in series at a first midpoint connection, the first semiconductor device being coupled to a first point on the first DC bus rail and the first midpoint connection being coupled to a field winding. The second leg includes a third semiconductor device and a fourth semiconductor device coupled in series at a second midpoint connection, the third semiconductor device being coupled to a second point on the first DC bus rail and the second midpoint connection being coupled to the field winding. The discharge resistor is operatively coupled to the first DC bus rail between the first point and the second point.Type: GrantFiled: May 11, 2018Date of Patent: March 3, 2020Assignee: ABB Schweiz AGInventors: Chenjie Lin, Ghanshyam Shrestha, Mehanathan Pathmanathan, Pedro Rodriguez, Pasi Paloheimo, Tuomas Janhunen, Susanna Bäckström-Andersson, Eino Silander
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Publication number: 20190348936Abstract: Unique systems, methods, techniques and apparatuses of a rotating DC power supply are disclosed. One exemplary embodiment includes a first and second DC bus rail, a first and second leg, and a discharge resistor. The first leg includes a first semiconductor device and a second semiconductor device coupled in series at a first midpoint connection, the first semiconductor device being coupled to a first point on the first DC bus rail and the first midpoint connection being coupled to a field winding. The second leg includes a third semiconductor device and a fourth semiconductor device coupled in series at a second midpoint connection, the third semiconductor device being coupled to a second point on the first DC bus rail and the second midpoint connection being coupled to the field winding. The discharge resistor is operatively coupled to the first DC bus rail between the first point and the second point.Type: ApplicationFiled: May 11, 2018Publication date: November 14, 2019Inventors: Chenjie Lin, Ghanshyam Shrestha, Mehanathan Pathmanathan, Pedro Rodriguez, Pasi Paloheimo, Tuomas Janhunen, Susanna Backstrom-Andersson, Eino Silander
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Publication number: 20190207484Abstract: Unique systems, methods, techniques and apparatuses of an exciterless synchronous generator are disclosed. One exemplary embodiment is an exciterless synchronous generator comprising a stator, a rotor, and a startup excitation system. The stator includes a set of stator windings. The rotor includes an energy harvest winding, a DC power supply including a DC bus and coupled to the energy harvest winding, and a field winding coupled to the DC power supply. The startup excitation system comprises one of a magnetic field generation system structured to generate a magnetic field received by the energy harvest winding in response to a rotation of the rotor, wherein the magnetic field is converted to DC power with the DC power supply and transmitted to the field winding; or a rotor DC power source including and diode coupled in series across the DC bus.Type: ApplicationFiled: December 29, 2017Publication date: July 4, 2019Inventors: Ghanshyam Shrestha, Chenjie Lin, Mehanathan Pathmanathan, Pedro Rodriguez
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Patent number: 9829540Abstract: A method for determining an undesired condition in an electrical drive system including an electrical machine and an electrical drive, wherein the method includes a) obtaining a measured signal of an electrical or mechanical parameter, b) obtaining a frequency spectrum of the measured signal, that contains a measured frequency component, c) determining whether the measured frequency component is within a predetermined distance from a trend line, which trend line is associated with only one specific frequency component of the electrical or mechanical parameter present during a specific undesired condition, d) on the condition that the measured frequency component is within the predetermined distance from the trend line increasing a counter associated with the trend line, e) repeating steps a) to d), wherein in case the counter reaches a predetermined number determining that the electrical drive system is subjected to the undesired condition associated with the trend line.Type: GrantFiled: May 18, 2016Date of Patent: November 28, 2017Assignee: ABB Schweiz AGInventors: Luca Peretti, Mehanathan Pathmanathan, Omer Ikram Ul Haq, Subrat Sahoo
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Publication number: 20170099019Abstract: A commutation circuit includes a coil connected to an H bridge, the H bridge including four main switches for reversing polarity and a resulting coil current in the coil. The commutation circuit further includes a voltage source configured to generate a bypass current, and at least one auxiliary switch for controlling the bypass current to thereby decrease a switch current through at least one of the main switches. By generating an appropriate bypass current with help of a voltage source, a switch current through a desired main switch in a leading state can be decreased and eventually brought to zero. Zero current in its turn enables the use of thyristors as main switches as it results in the thyristors to be turned off automatically. Furthermore, decreased switch current at the switching moment reduces switching losses even in different types of switches such as GTOs and IGBTs.Type: ApplicationFiled: March 31, 2015Publication date: April 6, 2017Inventors: Sjoerd Bosga, Veli-Matti Leppanen, Mehanathan Pathmanathan, Robert Chin, Yujing Liu
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Publication number: 20160356854Abstract: A method for determining an undesired condition in an electrical drive system including an electrical machine and an electrical drive, wherein the method includes a) obtaining a measured signal of an electrical or mechanical parameter, b) obtaining a frequency spectrum of the measured signal, that contains a measured frequency component, c) determining whether the measured frequency component is within a predetermined distance from a trend line, which trend line is associated with only one specific frequency component of the electrical or mechanical parameter present during a specific undesired condition, d) on the condition that the measured frequency component is within the predetermined distance from the trend line increasing a counter associated with the trend line, e) repeating steps a) to d), wherein in case the counter reaches a predetermined number determining that the electrical drive system is subjected to the undesired condition associated with the trend line.Type: ApplicationFiled: May 18, 2016Publication date: December 8, 2016Inventors: Luca Peretti, Mehanathan Pathmanathan, Omer Ikram Ul Haq, Subrat Sahoo