Patents by Inventor Michinobu Kambara

Michinobu Kambara 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).

  • Phase locked loop for controlling motor and spindle motor using the same
    Patent number: 8278910
    Abstract: A PLL for controlling a motor includes first and second feedback loops. The first feedback loop includes an oscillator for generating a signal having a frequency corresponding to an input voltage, a first phase comparator for outputting a first phase difference signal corresponding to a phase difference between the signal from the oscillator and an input signal, and a first smoothing filter for smoothing the first phase difference signal to output the smoothed signal as the input voltage. The second feedback loop includes a second phase comparator for outputting a second phase difference signal corresponding to a phase difference between a signal having a frequency corresponding to a rotational speed of the motor and the input signal, an adder for adding the first and second phase difference signals, and a second smoothing filter for smoothing an output of the adder to output the smoothed signal to the motor.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: October 2, 2012
    Assignee: ShinMaywa Industries, Ltd.
    Inventors: Hidekazu Machida, Michinobu Kambara, Takeshi Hasegawa, Fumihiko Shinoda
  • PHASE LOCKED LOOP FOR CONTROLLING MOTOR AND SPINDLE MOTOR USING THE SAME
    Publication number: 20100327853
    Abstract: A PLL for controlling a motor includes first and second feedback loops. The first feedback loop includes an oscillator for generating a signal having a frequency corresponding to an input voltage, a first phase comparator for outputting a first phase difference signal corresponding to a phase difference between the signal from the oscillator and an input signal, and a first smoothing filter for smoothing the first phase difference signal to output the smoothed signal as the input voltage. The second feedback loop includes a second phase comparator for outputting a second phase difference signal corresponding to a phase difference between a signal having a frequency corresponding to a rotational speed of the motor and the input signal, an adder for adding the first and second phase difference signals, and a second smoothing filter for smoothing an output of the adder to output the smoothed signal to the motor.
    Type: Application
    Filed: March 15, 2010
    Publication date: December 30, 2010
    Inventors: Hidekazu MACHIDA, Michinobu Kambara, Takeshi Hasegawa, Fumihiko Shinoda