Patent · US Active

Spherical ultrasound motor and control method for a spherical ultrasound motor

US8841868B2 · kind B2 · utility

3Cited by

4References

8Claims

0Family size

Assignee

NATIONAL UNIVERSITY ORPORATION TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY · JP

Inventors

Shigeki Toyama · Chiba, JP
Masahiko Hoshina · Tokyo, JP

Key dates

Filing date	Mar 10, 2010
Grant date	Sep 23, 2014
Priority date	—
Expiry date	Aug 3, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH02N2/163
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.