【Piezo Sonic ultrasonic motor】
It does not use coils or magnets to generate rotational energy, but uses piezoelectric ceramics that deform when a voltage is applied.
The amount of deformation of the piezoceramic is amplified by the metal part called the stator, and the deformation is controlled to generate rotational motion on the stator surface.
This rotational movement is transmitted to the rotor pressed against the stator by frictional force, and the rotor rotates. The shaft is fixed to this rotor and transmits the torque and rotation of the motor to the outside.
Since this frictional force is constantly generated, the position can be maintained (high holding force) even when de-energized and uncontrolled, and a direct drive without backlash can be realized.
Conventional ultrasonic motors have higher torque than motors (DC motors, etc.) that rotate with the same size electromagnetic force, but the problem was that their service life was short, about 1/10.
By reviewing the structure and material of the Piezo Sonic ultrasonic motor, we have succeeded in extending the service life by more than twice that of conventional ultrasonic motors of the same size.
In addition, a significant increase in torque has also been achieved. (Patent pending, 2018 Japan Society for Precision Engineering "Monozukuri Award")
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#PSM60 #motor #Ultrasonic
