Patent Title

Piezo actuator having electrode structure for the torsional vibration mode and ultrasonic motor containing the same

Operation principle

Causing a torsional vibration using the piezoelectric oscillator having the electrode structure of a vane form, the torsional vibration makes the rotor rotate which is fastened along the sides of the groove of the piezoelectric oscillator.

Characteristics

• Creative electrode pattern for making torsional vibration. (Patent technology)
• The world most simplest rotation motor composed of three parts ( piezoelectric ceramic, rotor, spring)

• Mass productive and price competitive simple structure
• Excellent durability
• High efficiency (minimizing energy loss due to heat generation, the surface temperature increases to 40℃ during continuous 10hr driving
• Forward / Reverse rotation available   
• No EMI noise since the coil is not required for this motor (applicable to the EMI noise-sensitive applications)
• Low noise
• Precise nano radian rotation is possible due to step driving   
• Rpm control in accordance with the drive voltage   
• Continuous operation (up to 1800rpm)   

Applications

• Automotive
• EMI noise sensitive field (medical application and etc.)
• Precise control (Robot and etc.)