Ultrasonic motor and stator for ultrasonic motor
AssigneeAsmo Co., Ltd.
InventorsMasahiko Komoda, Yukiyasu Kato
Life of this patent
Estimating the term…
Abstract
An ultrasonic motor has a stator and a rotor which is press fit to the stator and rotates in accordance with the vibration of the stator. The stator includes a pair of metal blocks, a piezoelectric element located between the metal blocks, a tightening member and a positioning member. The tightening member is inserted through the metal blocks and the piezoelectric element to tighten the metal blocks and the piezoelectric element in the axial direction. The positioning member determines the radial position of the metal blocks. This reduces misalignment of metal blocks and the tightening member, and the stator for the ultrasonic motor.
Claims13
An ultrasonic motor comprising:
- a stator, wherein the stator includes:
- a pair of metal blocks;
- a piezoelectric element located between the metal blocks, wherein, when drive voltage having a predetermined frequency is applied to the piezoelectric element, the piezoelectric element vibrates the stator;
- a tightening member, which is inserted through the metal blocks and the piezoelectric element to tighten the metal blocks and the piezoelectric element in the axial direction;
- a positioning member for determining the radial position of the metal blocks;
- and
- a rotor, which is press fit to the stator and rotates in accordance with the vibration of the stator.
A stator located in an ultrasonic motor, wherein the stator comprising:
- a pair of metal blocks;
- a piezoelectric element located between the metal blocks, wherein, when drive voltage having a predetermined frequency is applied to the piezoelectric element, the piezoelectric element vibrates the stator;
- a tightening member, which is inserted through the metal blocks and the piezoelectric element to axially tighten the metal blocks and the piezoelectric element;
- and
- a positioning member for determining the position of the metal blocks in the radial direction.
An ultrasonic motor comprising:
- a stator, wherein the stator includes:
- a pair of metal blocks having end surfaces that face each other, wherein each metal block includes an insertion hole, which extends in the axial direction of the metal block, wherein a female screw is formed on the inner circumferential surface of each insertion hole, wherein each insertion hole has an opening, which is open at the corresponding end surface, and wherein a portion of each insertion hole that is close to the opening is defined by a positioning surface;
- a piezoelectric element located between the metal blocks, wherein, when drive voltage having a predetermined frequency is applied to the piezoelectric element, the piezoelectric element vibrates the stator;
- a tightening member for tightening the metal blocks and the piezoelectric element in the axial direction, wherein the tightening member includes a columnar positioning member and a pair of male screws, which extend in different directions from the positioning member, wherein each male screw is screwed to the corresponding female screws, wherein the positioning member is inserted through the piezoelectric element and is engaged with the positioning surfaces to determine the radial position of the metal blocks;
- and
- a rotor, which is press fit to the stator and rotates in accordance with the vibration of the stator.
Dependencies are inferred from the claim text.