Patents by Inventor Hiroaki Tamae

Hiroaki Tamae 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: 4970423
    Abstract: A stepping motor having a non-touch rotation sensor includes rotor core 5 having magnetic pole teeth of a uniform angular pitch, a stator core 1 having plural magnetic pole teeth groups having magnetic pole teeth of the same angular pitch as the rotor core magnetic pole teeth pitch, and a rotor teeth sensor mounted on the stator core for detecting the rotor magnetic pole teeth and issuing polyphase electric signals.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: November 13, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroaki Tamae, Yoshihiro Ashizaki
  • Patent number: 4818908
    Abstract: A Brushless motor with phase advance has a rotor having magnetic poll teeth, a stator having plural coils and facing the rotor across a gap, and a bearing for rotatably supporting the rotor. A position sensor is mounted on the stator and detects variations in the position of the rotor and converts said variations into an electrical signal which issues as a polyphase positional signal having an approximate sine-wave shape. A velocity detecting device converts the positional signal into a velocity signal. Electronic switching apparatus receives a step advance instruction signal from outside the motor and selects the polyphase positional signal corresponding to the step advance instruction signal. Phase advance circuitry advances the phase of the positional signal by using a sum of the velocity and the selected positional signal as the phase advance amount.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: April 4, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroaki Tamae, Yoshihiro Ashizaki