The document summarizes a technical seminar presentation on piezoelectric motors given by Gaganadhree R and Manasa S A. It first defines piezoelectricity as the ability of certain materials to generate an electric charge in response to applied mechanical stress. A piezoelectric motor uses this reverse piezoelectric effect to continuously convert electric power into rotational mechanical energy. The stator contains piezoceramic crystals that contract and expand when a voltage is applied, causing the bottom axis and attached upper axis/shaft to rotate, providing torque.

1. TECHNICAL SEMINAR PRESENTATION
ON
PIEZOELECTRIC MOTORS
PRESENTED BY
NAME : GAGANADHREE R
AND MANASA S A
BRANCH/SEM : ISE/1ST SEM

2. CONTENT
• INTRODUCTION
• PIEZOELECTRIC EFFECT
• PIEZOELECTRIC MOTORS
• WORKING OF PIEZOELECTRIC MOTORS
• TYPES OF PIEZOELECTRIC MOTORS
• ADVANTAGES AND DISADVANTAGES OF
PIEZOELECTRIC MOTORS
• APPLICATION OF PIEZOELECTRIC MOTORS

3. PIEZOELECTRIC MOTORS
INTRODUCTION
• THE PIEZOELECTRIC OR ULTRASONIC MOTOR WAS INVENTED BY SADAYUKI UEHA
AND MINORU KUROSAWA SINCE 1988.
• THE WORD PIEZOELECTRIC IS DERIVED FROM THE GREEK PIEZEIN, WHICH MEANS
TO SQUEEZE OR PRESS, AND PIEZO, WHICH IS GREEK FOR “PUSH”.

4. PIEZOELECTRIC MOTOR
• PIEZOELECTRIC EFFECT IS THE ABILITY OF CERTAIN MATERIALS TO
GENERATE AN ELECTRIC CHARGE IN RESPONSE TO APPLIED
MECHANICAL STRESS.
• CONVERSE OF PIEZOELECTRIC EFFECT : IT IS GENERATION OF
STRESS WHEN AN ELECTRIC FIELD IS APPLIED.
• PIEZOELECTRIC MATERIAL : PIEZOELECTRIC MATERIALS OR
PIEZOELECTRICS ARE THE MATERIALS THAT CAN PRODUCE
ELECTRIC ENERGY UPON APPLICATION OF MECHANICAL STRESS.
• PIEZOCERAMICS : A SIGNIFICANT GROUP OF PIEZOELECTRIC
MATERIALS, ARE FERROELECTRIC MATERIALS WITH
POLYCRYSTALLINE STRUCTURES

5. PIEZOELECTRIC MOTORS
A PIEZOELECTRIC MOTOR OR PIEZO MOTOR IS A TYPE OF ELECTRIC MOTOR
BASED ON THE CHANGE IN SHAPE OF A PIEZOELECTRIC MATERIAL WHEN AN
ELECTRIC FIELD IS APPLIED, AS A CONSEQUENCE OF THE CONVERSE
PIEZOELECTRIC EFFECT.
A PIEZOELECTRIC MOTOR, BASES ON UTILIZATION OF THE REVERSE
PIEZOELECTRIC EFFECT FOR CONTINUOUS CONVERSION OF ELECTRIC POWER INTO
MECHANICAL ENERGY OF ROTATION OF THE ROTOR.

6. CONSTRUCTION AND WORKING
• STATOR CONSISTS OF PIEZOCERAMIC
WHICH IS A PIEZOELECTRIC CRYSTAL
WHICH EXPERIENCES REVERSE
PIEZOELECTRIC EFFECT.IT CONTRACTS
AND EXPANDS WHEN WE APPLY VOLTAGE
TO IT THAT LEADS TO THE ROTATION OF
BOTTOM AXIS INTERN WHICH MAKES THE
UPPER AXIS ROTATE WHICH IS BASICALLY
SHAFT AND WILL HAVE THE REQUIRED
TORQUE