Patents by Inventor Palanivel Subramaniam
Palanivel Subramaniam 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: 20230288115Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated spectrum of frequencies. The controller further determines one or more resonance frequencies associated with the HVAC system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms wherein the spectrum of frequencies of the first PWM algorithm lacks frequency peaks that overlap with the one or more resonance frequencies associated with the HVAC system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: ApplicationFiled: May 18, 2023Publication date: September 14, 2023Inventor: Palanivel Subramaniam
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Patent number: 11703261Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated spectrum of frequencies. The controller further determines one or more resonance frequencies associated with the HVAC system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms wherein the spectrum of frequencies of the first PWM algorithm lacks frequency peaks that overlap with the one or more resonance frequencies associated with the HVAC system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: GrantFiled: June 28, 2021Date of Patent: July 18, 2023Assignee: Lennox Industries Inc.Inventor: Palanivel Subramaniam
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Patent number: 11658547Abstract: A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.Type: GrantFiled: September 14, 2022Date of Patent: May 23, 2023Assignee: Lennox Industries Inc.Inventors: Stephen J. Vendt, Austin Clay Styer, Palanivel Subramaniam, Sunil K. Khiani, Wei Wang, Nasim Rahman
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Patent number: 11575342Abstract: A motor driving system includes motor driving circuitry configured to operate an electric motor. The system further includes a controller that is configured to send a signal to energize the electric motor and to measure a back electromotive force voltage of the electric motor. The controller is further configured to determine a temperature value based on the measured back electromotive force voltage using a back electromotive force voltage mapping that maps back electromotive force voltages to temperature values. The controller is further configured to determine an expected winding resistance value based on the determined temperature value using a resistance mapping that maps winding resistance values to temperature values. The controller is further configured to measure a winding resistance of the electric motor, to compare the measured winding resistance of the electric motor to the expected winding resistance value, and to output a match result indication based on the comparison.Type: GrantFiled: September 22, 2020Date of Patent: February 7, 2023Assignee: Lennox Industries Inc.Inventors: Jose Sandoval, Palanivel Subramaniam, Harvey Veselka
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Publication number: 20230006518Abstract: A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.Type: ApplicationFiled: September 14, 2022Publication date: January 5, 2023Applicant: Lennox Industries Inc.Inventors: STEPHEN J. VENDT, Austin Clay STYER, Palanivel SUBRAMANIAM, Sunil K. KHIANI, Wei WANG, Nasim RAHMAN
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Patent number: 11482909Abstract: A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.Type: GrantFiled: June 17, 2020Date of Patent: October 25, 2022Inventors: Stephen J. Vendt, Austin Clay Styer, Palanivel Subramaniam, Sunil K. Khiani, Wei Wang, Nasim Rahman
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Publication number: 20220094298Abstract: A motor driving system includes motor driving circuitry configured to operate an electric motor. The system further includes a controller that is configured to send a signal to energize the electric motor and to measure a back electromotive force voltage of the electric motor. The controller is further configured to determine a temperature value based on the measured back electromotive force voltage using a back electromotive force voltage mapping that maps back electromotive force voltages to temperature values. The controller is further configured to determine an expected winding resistance value based on the determined temperature value using a resistance mapping that maps winding resistance values to temperature values. The controller is further configured to measure a winding resistance of the electric motor, to compare the measured winding resistance of the electric motor to the expected winding resistance value, and to output a match result indication based on the comparison.Type: ApplicationFiled: September 22, 2020Publication date: March 24, 2022Inventors: Jose Sandoval, Palanivel Subramaniam, Harvey Veselka
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Publication number: 20210399612Abstract: A method of calibrating a motor assembly includes selecting an electric motor and a motor controller for the motor assembly, obtaining at least one electric motor parameter of the electric motor, determining a correction factor for the electric motor based upon the at least one electric motor parameter, and programming the motor controller with the correction factor.Type: ApplicationFiled: June 17, 2020Publication date: December 23, 2021Applicant: Lennox Industries Inc.Inventors: Stephen J. Vendt, Austin Clay Styer, Palanivel Subramaniam, Sunil K. Khiani, Wei Wang, Nasim Rahman
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Publication number: 20210325098Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated spectrum of frequencies. The controller further determines one or more resonance frequencies associated with the HVAC system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms wherein the spectrum of frequencies of the first PWM algorithm lacks frequency peaks that overlap with the one or more resonance frequencies associated with the HVAC system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: ApplicationFiled: June 28, 2021Publication date: October 21, 2021Inventor: Palanivel Subramaniam
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Patent number: 11079151Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC and/or refrigeration system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated harmonic signature. The controller further determines one or more resonance frequencies associated with the HVAC and/or refrigeration system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms based at least in part on the harmonic signature associated with the first PWM algorithm mitigating the one or more resonance frequencies associated with the refrigeration system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: GrantFiled: June 15, 2020Date of Patent: August 3, 2021Assignee: Lennox Industries Inc.Inventor: Palanivel Subramaniam
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Publication number: 20200340724Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC and/or refrigeration system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated harmonic signature. The controller further determines one or more resonance frequencies associated with the HVAC and/or refrigeration system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms based at least in part on the harmonic signature associated with the first PWM algorithm mitigating the one or more resonance frequencies associated with the refrigeration system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: ApplicationFiled: June 15, 2020Publication date: October 29, 2020Inventor: Palanivel Subramaniam
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Patent number: 10746186Abstract: An apparatus includes a blower drive and a protection circuit. The blower drive includes a processor and a capacitor. The capacitor is electrically coupled to the processor and provides electrical power to the processor during a short circuit in the blower drive. The protection circuit is electrically coupled to the blower drive and includes a first switch, a positive temperature coefficient resistor, and a second switch. The positive temperature coefficient resistor is electrically coupled in series to the first switch. The second switch is electrically coupled in parallel to the positive temperature coefficient resistor and opens during the short circuit in the blower drive. The first switch opens after the second switch opens and after a short circuit current is below a threshold.Type: GrantFiled: August 4, 2017Date of Patent: August 18, 2020Assignee: Lennox Industries Inc.Inventors: Palanivel Subramaniam, Austin Clay Styer
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Patent number: 10731907Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC and/or refrigeration system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated harmonic signature. The controller further determines one or more resonance frequencies associated with the HVAC and/or refrigeration system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms based at least in part on the harmonic signature associated with the first PWM algorithm mitigating the one or more resonance frequencies associated with the refrigeration system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: GrantFiled: June 12, 2017Date of Patent: August 4, 2020Assignee: Lennox Industries, Inc.Inventor: Palanivel Subramaniam
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Patent number: 10712040Abstract: An apparatus includes a processor and a blower drive. The processor receives an altitude and a first blower coefficient. The processor determines a second blower coefficient based on the first blower coefficient and the altitude. The blower drive receives the second blower coefficient and adjusts at least one of a speed and a torque of a motor based on the second blower coefficient.Type: GrantFiled: August 8, 2017Date of Patent: July 14, 2020Assignee: Lennox Industries Inc.Inventor: Palanivel Subramaniam
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Patent number: 10333299Abstract: A power converter is provided that includes a detection circuit configured to determine a power source type based on at least one characteristic of power received from a power source. The detection circuit is also configured to determine an operating edge of the soft AC source by monitoring at least one parameter as the soft AC power source approaches a power limit, and assign an operating point to the soft AC power source based on the operating edge to increase power delivery of the soft AC power source.Type: GrantFiled: March 3, 2014Date of Patent: June 25, 2019Assignee: ABB Schweiz AGInventors: Edward Clark Fontana, Tab O Walter, Roy Jaescentt Davis, Palanivel Subramaniam
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Publication number: 20190049131Abstract: An apparatus includes a processor and a blower drive. The processor receives an altitude and a first blower coefficient. The processor determines a second blower coefficient based on the first blower coefficient and the altitude. The blower drive receives the second blower coefficient and adjusts at least one of a speed and a torque of a motor based on the second blower coefficient.Type: ApplicationFiled: August 8, 2017Publication date: February 14, 2019Inventor: Palanivel Subramaniam
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Publication number: 20190040868Abstract: An apparatus includes a blower drive and a protection circuit. The blower drive includes a processor and a capacitor. The capacitor is electrically coupled to the processor and provides electrical power to the processor during a short circuit in the blower drive. The protection circuit is electrically coupled to the blower drive and includes a first switch, a positive temperature coefficient resistor, and a second switch. The positive temperature coefficient resistor is electrically coupled in series to the first switch. The second switch is electrically coupled in parallel to the positive temperature coefficient resistor and opens during the short circuit in the blower drive. The first switch opens after the second switch opens and after a short circuit current is below a threshold.Type: ApplicationFiled: August 4, 2017Publication date: February 7, 2019Inventors: Palanivel Subramaniam, Austin Clay Styer
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Publication number: 20180356140Abstract: A system includes an electronic power converter and a controller. The electronic power converter supplies power to one or more motor drives of an HVAC and/or refrigeration system. The controller obtains a plurality of pulse width modulation (PWM) algorithms. Each PWM algorithm has an associated harmonic signature. The controller further determines one or more resonance frequencies associated with the HVAC and/or refrigeration system. The controller also selects a first PWM algorithm from the plurality of PWM algorithms based at least in part on the harmonic signature associated with the first PWM algorithm mitigating the one or more resonance frequencies associated with the refrigeration system. The controller further operates the electronic power converter according to the first PWM algorithm.Type: ApplicationFiled: June 12, 2017Publication date: December 13, 2018Inventor: Palanivel Subramaniam
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Patent number: 10084372Abstract: A system includes an alternating current (AC) to direct current (DC) voltage convertor, a power factor correction (PFC) subsystem, and one or more motor drives. The AC to DC voltage converter receives alternating current from an AC voltage source. The PFC subsystem receives DC voltage from the AC to DC voltage convertor. The PFC subsystem also outputs a corrected DC voltage corresponding to an output voltage setpoint. The PFC subsystem includes a controller operable to dynamically adjust the output voltage setpoint. The one or more motor drives receive voltage via the PFC subsystem. The output voltage setpoint is determined based at least in part on estimating a load associated with the one or more motor drives configured to receive voltage via the PFC subsystem.Type: GrantFiled: June 16, 2017Date of Patent: September 25, 2018Assignee: Lennox Industries Inc.Inventors: Palanivel Subramaniam, Austin Clay Styer
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Patent number: 9746502Abstract: Systems and methods of monitoring a power system power converter are provided herein. The system includes a plurality of parallel-coupled power converters comprising a power converter input and a power converter output, the power converter output configured to be coupled to a load, each power converter of the plurality of parallel-coupled power converters comprising a power converter controller. The power converter controller is configured to compare an output current of a corresponding power converter to a predetermined output current threshold, monitor the output current for a predetermined time duration when the output current is below the predetermined output current threshold, and shut down the corresponding power converter when the output current is below the predetermined output current threshold for the predetermined time duration.Type: GrantFiled: February 5, 2015Date of Patent: August 29, 2017Assignee: GENERAL ELECTRIC COMPANYInventors: Ravi Gautam, Palanivel Subramaniam, Raghothama Reddy