Patents by Inventor Mark Wardrup

Mark Wardrup 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).

  • Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
    Patent number: 6696814
    Abstract: A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: February 24, 2004
    Assignee: Tyco Electronics Corporation
    Inventors: Jeffery L. Henderson, Hong Moon, Mark Wardrup, Ivan Reede
  • Microprocessor for controlling the speed and frequency of a motor shaft in a power tool
    Publication number: 20030047331
    Abstract: A control system for driving a power tool is provided comprising a power source, a motor adapted to drive a shaft, a power switching unit interconnecting the power source and the motor, and a controller. The power switching unit applying a pulse width modulated (PWM) drive signal from the power source to the motor. The controller monitoring at least one electrical characteristic of at least one of the power source, motor and power switching unit and adjusting the operating duty cycle of the PWM drive signal based on the electrical characteristics.
    Type: Application
    Filed: July 9, 2001
    Publication date: March 13, 2003
    Inventors: Jeffery L. Henderson, Hong Moon, Mark Wardrup, Ivan Reede
  • Circuit for controlling dynamic braking of a motor shaft in a power tool
    Publication number: 20020158593
    Abstract: A circuit for providing a braking force to a power tool is provided comprising a motor adapted to rotate a drive shaft in a power tool, a power supply electronically connected to the motor, and a braking module, located between the motor and the power supply, for applying a current limited braking force to the motor when the power supply is disconnected to the motor.
    Type: Application
    Filed: April 27, 2001
    Publication date: October 31, 2002
    Inventors: Jeffery L. Henderson, Hong Moon, Mark Wardrup