Patents by Inventor Caleb W. Secrest

Caleb W. Secrest 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: 10396696
    Abstract: A current regulator is provided for an electric machine drive system for driving an electric machine. The current regulator includes an adjustable damping module that has a value of virtual damping resistance that is applied at the current regulator. The value of virtual damping resistance is adjustable as a function of sampling frequency. A controller can control the current regulator by determining whether the sampling frequency has changed since a previous execution cycle of the current regulator, and when the sampling frequency has changed since the previous execution cycle, the controller can modify the damping value as a function of the sampling frequency to allow the damping value to change with the sampling frequency. The damping value has a new value of virtual damping resistance that is applied at the current regulator after modifying the damping value. The controller can then execute the current regulator in accordance with the modified damping value to generate the voltage commands.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: August 27, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Brent S. Gagas, Dwarakanath V. Simili, Caleb W. Secrest
  • Publication number: 20190260319
    Abstract: A current regulator is provided for an electric machine drive system for driving an electric machine. The current regulator includes an adjustable damping module that has a value of virtual damping resistance that is applied at the current regulator. The value of virtual damping resistance is adjustable as a function of sampling frequency. A controller can control the current regulator by determining whether the sampling frequency has changed since a previous execution cycle of the current regulator, and when the sampling frequency has changed since the previous execution cycle, the controller can modify the damping value as a function of the sampling frequency to allow the damping value to change with the sampling frequency. The damping value has a new value of virtual damping resistance that is applied at the current regulator after modifying the damping value. The controller can then execute the current regulator in accordance with the modified damping value to generate the voltage commands.
    Type: Application
    Filed: February 21, 2018
    Publication date: August 22, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Brent S. Gagas, Dwarakanath V. Simili, Caleb W. Secrest
  • Patent number: 10355631
    Abstract: A current regulator is provided for an electric machine drive system for driving an electric machine. The current regulator is configurable to operate in a first configuration or a second configuration depending on a synchronous speed of the electric machine. A controller can configure an operational mode of the current regulator by selecting, based on the synchronous speed of the electric machine, either the first configuration of the current regulator or the second configuration of the current regulator as a currently active configuration, and can then execute the current regulator in accordance with the currently active configuration. The first configuration of the current regulator comprises a first set of elements and cross-coupling gain blocks, whereas the second configuration of the current regulator can include the first set of elements without the cross-coupling gain blocks.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: July 16, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Caleb W. Secrest, Brent S. Gagas, Dwarakanath V. Simili
  • Patent number: 10326390
    Abstract: Systems and method for operating motors are provided. In an exemplary embodiment, a method for operating a motor includes receiving a first output corresponding to a motor angular position. The method further includes synthesizing a synthesized second output from the first output and from an estimated motor angular velocity. The method also includes calculating the motor angular position from the first output and the synthesized second output. The method includes estimating the motor angular velocity from the motor angular position. Further, the method includes operating the motor to produce torque based on the motor angular position and the motor angular velocity.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: June 18, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David S. Ochs, Yo Chan Son, Caleb W. Secrest
  • Patent number: 10319360
    Abstract: In various embodiments, methods, systems, and vehicles are provided for masking a tonal noise of a motor. In certain embodiments, a vehicle includes a drive system and an active masking acoustic signal generator (AMAG). The drive system includes a motor generating a tonal noise. The AMAG is configured to at least facilitate masking the tonal noise, by introducing a complementary harmonic tone, injecting dithering into the motor, or both.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: June 11, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Song He, Yo Chan Son, Gilsu Choi, Caleb W. Secrest, Aja Anjilivelil, Scott M. Reilly, John P. Miller
  • Publication number: 20190031046
    Abstract: A rotary system includes a rotor, a vector-based position sensor, and a controller executing a method to eliminate fundamental harmonic position measurement error. The sensor measures angular position of the rotor and outputs raw sine and cosine signals representative of the angular position. The raw signals have a fundamental harmonic position measurement error at the frequency of the sensor signals. The controller receives the raw signals, adaptively adds or subtracts sensor signal offsets to or from the raw signals to generate offset sine and cosine signals, calculates a corrected position of the rotor using the offset sine and cosine signals eliminating the fundamental error, and controls an action or state of the rotary system using the corrected position. The rotor may be part of an electric machine, such as in a vehicle.
    Type: Application
    Filed: July 25, 2017
    Publication date: January 31, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Caleb W. Secrest, David S. Ochs
  • Publication number: 20190028044
    Abstract: Systems and method for operating motors are provided. In an exemplary embodiment, a method for operating a motor includes receiving a first output corresponding to a motor angular position. The method further includes synthesizing a synthesized second output from the first output and from an estimated motor angular velocity. The method also includes calculating the motor angular position from the first output and the synthesized second output. The method includes estimating the motor angular velocity from the motor angular position. Further, the method includes operating the motor to produce torque based on the motor angular position and the motor angular velocity.
    Type: Application
    Filed: July 24, 2017
    Publication date: January 24, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David S. Ochs, Yo Chan Son, Caleb W. Secrest
  • Patent number: 10156462
    Abstract: A system includes a rotary device, a vector-based position sensor outputting raw sine and cosine signals indicative of an angular position of the rotary device, and a controller. The controller executes a method by receiving the raw sine and cosine signals from the sensor, generating corrected sine and cosine signals by applying an amplitude error input signal to a first integrator block using a first predetermined trigonometric relationship, and executing a control action for the rotary device via output signals using the corrected signals. The first predetermined trigonometric relationship is SC2?CC2, with SC and CC being the respective corrected sine and cosine signals. The controller may use a second predetermined trigonometric relationship, SC·CC, to apply an orthogonality error input signal to a second integrator block.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: December 18, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: David S. Ochs, Caleb W. Secrest, Yo Chan Son
  • Publication number: 20180128658
    Abstract: A system includes a rotary device, a vector-based position sensor outputting raw sine and cosine signals indicative of an angular position of the rotary device, and a controller. The controller executes a method by receiving the raw sine and cosine signals from the sensor, generating corrected sine and cosine signals by applying an amplitude error input signal to a first integrator block using a first predetermined trigonometric relationship, and executing a control action for the rotary device via output signals using the corrected signals. The first predetermined trigonometric relationship is SC2-CC2, with SC and CC being the respective corrected sine and cosine signals. The controller may use a second predetermined trigonometric relationship, SC·CC, to apply an orthogonality error input signal to a second integrator block.
    Type: Application
    Filed: November 7, 2016
    Publication date: May 10, 2018
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David S. Ochs, Caleb W. Secrest, Yo Chan Son