Patents by Inventor Ludovic Andre Chretien

Ludovic Andre Chretien 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).

  • Patent number: 12021462
    Abstract: Methods and systems for controlling an electric motor using a motor controller including a processor are provided. The method includes transmitting, by the processor, a no-spin signal commanding the electric motor not to spin, receiving temperature information associated with a temperature of the electric motor, comparing the temperature information to a predetermined threshold temperature to determine whether the temperature is at a sufficient level to prevent icing, and adjusting current applied to the electric motor when the temperature measurement is below the predetermined threshold.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: June 25, 2024
    Assignee: Regal Beloit America, Inc.
    Inventors: Zachary Joseph Stauffer, Mark Lyon Klopp, David Allen Clendenen, Ronald William Blotkamp, Maung Saw Eddison, Ludovic Andre Chretien
  • Publication number: 20240204698
    Abstract: An electric motor system is provided. The electric motor system includes a drive circuit including an inverter configured to supply variable frequency current over a first duration and a switch configured to supply line frequency current over a second duration. The electric motor system further includes an electric motor coupled to the drive circuit and a controller communicatively coupled to the drive circuit. The controller is configured to control the inverter to supply variable frequency current to the electric motor over the first duration, determine to control the drive circuit to transition from supplying variable frequency current to supplying line frequency current, measure at least one parameter of the inverter, compute, based on the at least one measured parameter, an adjustment to a default parameter to enable the inverter to reach a threshold output frequency, and operate the inverter based on the computed adjustment to the default parameter.
    Type: Application
    Filed: December 20, 2022
    Publication date: June 20, 2024
    Inventors: Michael R. Koller, Ludovic Andre Chretien
  • Patent number: 11959679
    Abstract: A fan drive circuit for a variable speed fan motor in a cooling system, includes an inverter configured to supply a current signal to stator windings of the variable speed fan motor, a frequency detection circuit coupled to an output stage of an inverter of a compressor motor of the cooling system and configured to detect a first frequency of a compressor current signal at the output stage of a variable speed compressor drive circuit and generate a frequency signal, and a digital signal processor (DSP) coupled to the inverter and the frequency detection circuit. The DSP is configured to receive the frequency signal corresponding to the first frequency from the frequency detection circuit, select a second frequency corresponding to the first frequency at which to operate the variable speed fan motor, and transmit control signals to the inverter to supply current to the stator windings at the second frequency.
    Type: Grant
    Filed: October 13, 2020
    Date of Patent: April 16, 2024
    Assignee: Regal Beloit America, Inc.
    Inventors: Paul S. Mullin, Daniel E. Thompson, Ludovic Andre Chretien
  • Patent number: 11881801
    Abstract: Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.
    Type: Grant
    Filed: June 12, 2023
    Date of Patent: January 23, 2024
    Inventors: Ludovic Andre Chretien, Roger Carlos Becerra, Kamron Mark Wright, Lester Benjamin Manz
  • Publication number: 20240014763
    Abstract: A motor controller for an electric motor is provided. The motor controller includes an inverter configured to supply current to stator windings of the electric motor. The motor controller further includes a plurality of sensors configured to generate a sensor signal in response to detecting a parameter. The sensor signal represents a measured parameter. The motor controller further includes a processor coupled in communication with the inverter and with the plurality of sensors. The processor is configured to, in a first mode, transmit a control signal to the inverter to operate the electric motor at a first frequency. The processor is further configured to receive the sensor signal from the plurality of sensors. The processor is further configured to determine a first fault condition is present at the electric motor based on the measured parameter represented by the sensor signal.
    Type: Application
    Filed: September 26, 2023
    Publication date: January 11, 2024
    Inventors: Ludovic Andre Chretien, Brian Lee Beifus, Michael R. Koller
  • Publication number: 20230421086
    Abstract: A motor controller for an electric motor is provided. The motor controller includes a voltage limiting circuit configured to be coupled to an alternating current (AC) source and is configured to limit a voltage at an output node of the AC source, a filter configured to be coupled to the AC source and is configured to produce a filtered line frequency AC signal, a rectifier coupled to the filter and configured to produce a direct current (DC) signal from the filtered line frequency AC signal, an inverter coupled to the rectifier and configured to produce an AC signal on an input node of the electric motor, and a line contactor coupled between the AC source and the input node of the electric motor and configured to supply the input node of the electric motor directly from the AC source to energize stator windings therewith when the inverter is disabled.
    Type: Application
    Filed: September 8, 2023
    Publication date: December 28, 2023
    Inventor: Ludovic Andre Chretien
  • Patent number: 11815279
    Abstract: Described herein is an electric motor assembly for an environmental control system. The electric motor assembly includes a fan configured to rotate to circulate air within a controlled environment chamber of the environmental control system, and an electric motor coupled to the fan and configured to rotate the fan. The electric motor includes a motor controller configured to receive a braking control signal from a sensor associated with the controlled environment chamber. The braking control signal indicates an entrance to the controlled environment chamber is about to be opened. The motor controller is also configured to initiate braking the electric motor in response to receiving the braking control signal.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: November 14, 2023
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Leonard Theodore McElhose, Mohamad Khalil Dahouk, Paul Steven Mullin
  • Publication number: 20230344379
    Abstract: Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.
    Type: Application
    Filed: June 12, 2023
    Publication date: October 26, 2023
    Inventors: Ludovic Andre Chretien, Roger Carlos Becerra, Kamron Mark Wright, Lester Benjamin Manz
  • Publication number: 20230341153
    Abstract: An HVAC system including a multi-capacity compressor, and a control system for the multi-capacity compressor are described herein. The control system includes an AC line voltage source, a variable-voltage variable-frequency drive, and a processor. The AC line voltage source is configured to operate the multi-capacity compressor. The variable-voltage variable-frequency drive is coupled to the AC line voltage source and is configured to operate the multi-capacity compressor at a variable speed. The processor is coupled to the AC line voltage source and the variable-voltage variable-frequency drive and is configured to selectively couple the AC line voltage source and the variable-voltage variable-frequency drive to the multi-capacity compressor to operate the multi-capacity compressor. The processor is further configured to transmit a capacity control signal to the multi-capacity compressor.
    Type: Application
    Filed: June 20, 2023
    Publication date: October 26, 2023
    Inventors: Ludovic Andre Chretien, Norman C. Golm
  • Patent number: 11791760
    Abstract: A motor controller for an electric motor is provided. The motor controller includes an inverter configured to supply current to stator windings of the electric motor. The motor controller further includes a plurality of sensors configured to generate a sensor signal in response to detecting a parameter. The sensor signal represents a measured parameter. The motor controller further includes a processor coupled in communication with the inverter and with the plurality of sensors. The processor is configured to, in a first mode, transmit a control signal to the inverter to operate the electric motor at a first frequency. The processor is further configured to receive the sensor signal from the plurality of sensors. The processor is further configured to determine a first fault condition is present at the electric motor based on the measured parameter represented by the sensor signal.
    Type: Grant
    Filed: February 10, 2021
    Date of Patent: October 17, 2023
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Brian Lee Beifus, Michael R. Koller
  • Patent number: 11784602
    Abstract: A motor controller for an electric motor is provided. The motor controller includes a voltage limiting circuit configured to be coupled to an alternating current (AC) source and is configured to limit a voltage at an output node of the AC source, a filter configured to be coupled to the AC source and is configured to produce a filtered line frequency AC signal, a rectifier coupled to the filter and configured to produce a direct current (DC) signal from the filtered line frequency AC signal, an inverter coupled to the rectifier and configured to produce an AC signal on an input node of the electric motor, and a line contactor coupled between the AC source and the input node of the electric motor and configured to supply the input node of the electric motor directly from the AC source to energize stator windings therewith when the inverter is disabled.
    Type: Grant
    Filed: June 27, 2022
    Date of Patent: October 10, 2023
    Assignee: Regal Beloit America, Inc.
    Inventor: Ludovic Andre Chretien
  • Publication number: 20230283216
    Abstract: An electric motor system is described. The electric motor system includes a drive circuit configured to supply variable frequency current and a contactor configured to supply line frequency current, wherein the drive circuit includes a three-phase inverter and an H-bridge including two phases of the inverter. The electric motor system also includes an electric motor and a controller. The controller is configured to control the inverter to supply variable frequency current to the electric motor over a first duration and determine to control the drive circuit to transition from supplying variable frequency current to supplying line frequency current. The controller is also configured to determine a polarity of a sensed alternating current (AC) voltage, disable at least two switches of the H-bridge, and control the contactor to close, thereby preventing the contactor and the inverter from energizing the electric motor at the same time once the contactor is closed.
    Type: Application
    Filed: May 12, 2023
    Publication date: September 7, 2023
    Inventor: Ludovic Andre Chretien
  • Patent number: 11716040
    Abstract: Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: August 1, 2023
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Roger Carlos Becerra, Kamron Mark Wright, Lester Benjamin Manz
  • Patent number: 11689137
    Abstract: An electric motor system is described. The electric motor system includes a drive circuit configured to supply variable frequency current and a contactor configured to supply line frequency current, wherein the drive circuit includes a three-phase inverter and an H-bridge including two phases of the inverter. The electric motor system also includes an electric motor and a controller. The controller is configured to control the inverter to supply variable frequency current to the electric motor over a first duration and determine to control the drive circuit to transition from supplying variable frequency current to supplying line frequency current. The controller is also configured to determine a polarity of a sensed alternating current (AC) voltage, disable at least two switches of the H-bridge, and control the contactor to close, thereby preventing the contactor and the inverter from energizing the electric motor at the same time once the contactor is closed.
    Type: Grant
    Filed: July 8, 2022
    Date of Patent: June 27, 2023
    Assignee: Regal Beloit America, Inc.
    Inventor: Ludovic Andre Chretien
  • Publication number: 20230123360
    Abstract: An electric motor system is described. The electric motor system includes a drive circuit including an inverter configured to supply variable frequency current and a contactor configured to supply line frequency current. The electric motor system also includes an electric motor coupled to the drive circuit wherein the electric motor is communicatively coupled to a controller. The controller is configured to control the inverter to supply variable frequency current to the electric motor, thereby operating the electric motor at a motor speed, and determine, based upon at least one input parameter, a maximum potential motor speed the inverter can achieve. The controller is also configured to receive a command to operate the electric motor at line frequency current and control the drive circuit to transition from supplying variable frequency current to supplying line frequency current before the maximum potential motor speed the inverter can achieve is reached.
    Type: Application
    Filed: December 21, 2022
    Publication date: April 20, 2023
    Inventors: Ludovic Andre Chretien, Lester Benjamin Manz
  • Publication number: 20230006595
    Abstract: A motor controller for an electric motor is provided. The motor controller includes a voltage limiting circuit configured to be coupled to an alternating current (AC) source and is configured to limit a voltage at an output node of the AC source, a filter configured to be coupled to the AC source and is configured to produce a filtered line frequency AC signal, a rectifier coupled to the filter and configured to produce a direct current (DC) signal from the filtered line frequency AC signal, an inverter coupled to the rectifier and configured to produce an AC signal on an input node of the electric motor, and a line contactor coupled between the AC source and the input node of the electric motor and configured to supply the input node of the electric motor directly from the AC source to energize stator windings therewith when the inverter is disabled.
    Type: Application
    Filed: June 27, 2022
    Publication date: January 5, 2023
    Inventor: Ludovic Andre Chretien
  • Patent number: 11539319
    Abstract: An electric motor system is described. The electric motor system includes a drive circuit including an inverter configured to supply variable frequency current and a contactor configured to supply line frequency current. The electric motor system also includes an electric motor coupled to the drive circuit wherein the electric motor is communicatively coupled to a controller. The controller is configured to control the inverter to supply variable frequency current to the electric motor, thereby operating the electric motor at a motor speed, and determine, based upon at least one input parameter, a maximum potential motor speed the inverter can achieve. The controller is also configured to receive a command to operate the electric motor at line frequency current and control the drive circuit to transition from supplying variably frequency current to supplying line frequency current before the maximum potential motor speed the inverter can achieve is reached.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: December 27, 2022
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Lester Benjamin Manz
  • Patent number: 11515742
    Abstract: An interior permanent magnet machine is described. The machine includes a rotor rotatable about a central machine axis. The rotor includes a plurality of permanent magnet openings and a plurality of permanent magnets disposed therein. The permanent magnet openings are separated by rotor webs configured to facilitate reducing leakage flux through the rotor webs. The machine also includes a stator disposed coaxially with the rotor and separated from the rotor by a circumferential air gap. The stator includes a plurality of stator teeth that define a plurality of stator slots therebetween. The stator teeth include a stator tooth tip configured to facilitate reducing cogging torque and torque ripple.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: November 29, 2022
    Assignee: REGAL BELOIT AMERICA, INC.
    Inventors: Kerry B. Shelton, Subhash Marutirao Brahmavar, Marshall Miers, Ludovic Andre Chretien
  • Patent number: 11515765
    Abstract: A motor control assembly for an electric motor. The motor control assembly is configured to be coupled to the electric motor, and includes a wireless communication module, an input power connector, and an inverter module. The wireless communication module is configured to receive a wireless signal from a system controller. The input power connector is configured to receive a DC voltage from an external power supply module. The inverter module is coupled to the wireless communication module and the input power connector. The inverter module is configured to convert the DC voltage to an AC voltage to operate the electric motor according to the wireless signal.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: November 29, 2022
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Roger Carlos Becerra
  • Publication number: 20220341434
    Abstract: A control system for an electric motor in a compressor system includes a processing system configured to control an inverter to supply variable frequency power to the electric motor from the inverter. The processing system is configured to determine when to transition from supplying variable frequency power to supplying line frequency power to the electric motor. The processing system is configured to engage a pressure equalization mechanism to at least partially reduce a pressure differential developed between a suction portion and a discharge portion of the compressor system. The processing system is configured to apply line frequency power to at least one winding of the electric motor.
    Type: Application
    Filed: April 21, 2022
    Publication date: October 27, 2022
    Inventor: Ludovic Andre Chretien