Patents Assigned to National University Corporation Tokyo University of Agruculture and Technology
  • SPHERICAL ULTRASOUND MOTOR AND CONTROL METHOD FOR A SPHERICAL ULTRASOUND MOTOR
    Publication number: 20120119684
    Abstract: A substantially spherical rotor can be controlled with accuracy even in a relatively low speed rotation. In controlling rotational motions of a rotor 3 of a spherical ultrasonic motor 1, phases of voltages to be applied to three stators 9a, 9b, 9c are determined to set the direction of a rotation axis of the rotor 3. Frequencies of voltages to be applied to the three stators 9a, 9b, 9c are adjusted to control the rotation speed of the rotor 3. Thereby, control with high accuracy is enabled in a relatively low speed rotation.
    Type: Application
    Filed: March 10, 2010
    Publication date: May 17, 2012
    Applicant: National University Corporation Tokyo University of Agruculture and Technology
    Inventors: Shigeki Toyama, Masahiko Hoshina