Kabushiki Kaisha Toyota Jidoshokki

Tsuyoshi Kodera

Masaki Takasan

Kazuo Seiki

Hirohiko Ishikawa

Kitaru Iwata

Koji Maeda

Provided is an ultrasonic motor capable of realizing high torque. When two terminals are selected from a first terminal (), a second terminal (), and a third terminal () of a vibrator (), and AC voltages whose phases are shifted by 90 degrees relative to each other are respectively applied through both of those two terminals, vibration is generated in the stator vibration body (S), and elliptical vibration in a plane corresponding to the selected two terminals is generated at each of a step () of a first stator () and a corner () of a second stator (), which are in contact with a rotor (). Since the first stator () and the second stator () form the single stator vibration body (S), the step () of the first stator () and the corner () of the second stator () vibrate in the same vibration mode, rotational force is transmitted from both the step () of the first stator () and the corner () of the second stator (), and the rotor () rotates with high torque.

Ultrasonic motor

Provided is a vibration actuator in which a plurality of rotors can be driven by a single vibration unit. Two rotors (A) and (B) are attracted toward corresponding stators to be contacted with and pressurized against the corresponding stators () and (), respectively, through a tension of a wire member (). A composite vibration combining a plurality of vibrations is generated by a composite vibrator () to cause elliptical movements in corner portions of the stators () and (). As a result, the two rotors (A) and (B) abutting onto and pressurized against the two stators () and () are rotated about rotation centers (C) and (C) thereof, respectively, at the same time.

Growing community of inventors

Aichi, Japan

Tsuyoshi Kodera