Patents by Inventor Howard Hendricks

Howard Hendricks 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).

  • Linear hall effect sensors for multi-phase permanent magnet motors with PWM drive
    Patent number: 11018606
    Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: May 25, 2021
    Assignee: MICROCHIP TECHNOLOGY INCORPORATED
    Inventors: Ward R. Brown, Howard Hendricks
  • Linear Hall Effect Sensors For Multi-Phase Permanent Magnet Motors with PWM Drive
    Publication number: 20190149071
    Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
    Type: Application
    Filed: January 9, 2019
    Publication date: May 16, 2019
    Applicant: Microchip Technology Incorporated
    Inventors: Ward R. Brown, Howard Hendricks
  • Linear hall effect sensors for multi-phase permanent magnet motors with PWM drive
    Patent number: 10135369
    Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: November 20, 2018
    Assignee: MICROCHIP TECHNOLOGY INCORPORATED
    Inventors: Ward R. Brown, Howard Hendricks
  • Linear Hall Effect Sensors For Multi-Phase Permanent Magnet Motors With PWM Drive
    Publication number: 20170093313
    Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
    Type: Application
    Filed: September 28, 2016
    Publication date: March 30, 2017
    Applicant: Microchip Technology Incorporated
    Inventors: Ward R. Brown, Howard Hendricks
  • Sine Modified Trapezoidal Drive for Brushless DC Motors
    Publication number: 20140265967
    Abstract: A pulse width modulated (PWM) trapezoidal commutation drive to a brushless direct current (BLDC) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the BLDC motor. The values of the cosine of the angles between ?30 degrees and +30 degrees are used to modify the duty cycle of the PWM drive signal dependent upon the rotor angular positions determined from the times between the zero crossing BEMF voltages measured at the unconnected motor terminals.
    Type: Application
    Filed: August 5, 2013
    Publication date: September 18, 2014
    Inventors: Ward R. Brown, Howard Hendricks
  • Direct current electric motors
    Patent number: D287715
    Type: Grant
    Filed: April 15, 1983
    Date of Patent: January 13, 1987
    Assignee: Penn Engineering & Manufacturing Corp.
    Inventors: Charles A. Pittman, III, Howard Hendricks