Principle and Features of Ultrasonic Motors
General motors
Power OFF
I can't hold my posture
High voltage, magnetic field environments
Cannot operate properly
Telephone inquiries
03-6379-6020
Business hours
10:00~18:00
(Closed on Saturdays, Sundays, and holidays)
Technology & Development
Piezo Sonic is developing applications that integrate motors and robotics.
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Introduction of Robot Development Business
Piezosonic motor
Ultrasonic motors from other manufacturers
Stepping motor
DC motor
Available in magnetic field environment
Zero power and attitude maintenance
Power in the same size
Positioning accuracy
Lifetime (intermittent operation)
1.2Nm
1.0Nm
About 0.8Nm
About 0.05Nm
Institution ± 0.045°
Institutio ± 0.09°
Institutio ± 0.36°
Institutio ± 1.0°
6,000 hours (intermittent)
1,500 hours
5,000 hours
10,000 hours
Differences between ultrasonic motors and general motors
Typical motors rely on electromagnetic force for rotation, making them unsuitable for high-voltage or magnetic field environments. Additionally, they lose posture control when power is cut. Ultrasonic motors offer a solution by operating without electromagnetic force, using ultrasonic vibrations instead for rotation. This makes them suitable for challenging environments and allows them to maintain position even without power.
ultrasonic motor
DC motor
Stepping motor
I can hold my posture
Power OFF
Ultrasonic motor
High voltage, magnetic field environments
Can operate normally
Piezo Sonic ultrasonic motors
Piezoelectric ceramics, which deform under applied voltage, are used instead of coils or magnets for rotational energy. The deformation is amplified by a metal stator, generating rotational motion on its surface. This motion is transmitted to the rotor via frictional force, causing rotation. The shaft, fixed to the rotor, transmits motor torque and rotation. Constantly generated frictional force allows the motor to maintain position even when de-energized and uncontrolled (high holding force), enabling backlash-free direct drive.
Piezo Sonic's ultrasonic motors offer significantly longer lifespan and increased torque compared to conventional ultrasonic motors. Through structural and material improvements, their service life exceeds twice that of conventional models, rivaling that of stepping motors. These advancements have been recognized with patents and prestigious awards such as the "Monozukuri Award" from the Japan Society for Precision Engineering in 2018 and the "Good Design Award" in 2019.
Features of ultrasonic motors
This area diagram focuses on the relationship between torque and speed for ultrasonic motors, DC motors, and stepping motors of the same size.
Compared to other motors, ultrasonic motors are characterized by low speed and high torque.
They can maintain high holding force even when uncontrolled by frictional force and have no backlash, making it possible to build direct-drive actuator systems without using gears.
This area diagram focuses on the relationship between position controllability and weight (lightweight) of ultrasonic motors, DC motors, and stepping motors of the same size.
Compared to other motors, ultrasonic motors are characterized by their light weight and high position controllability.
The light weight of the rotating part results in low inertia, and when the drive signal stops, the motor instantly comes to rest due to frictional force, enabling precise positioning. (Final positioning accuracy depends on the external sensor: encoder or potentiometer and the control controller.)
DC Motor
Stepping motor
Ultrasonic motors
Ultrasonic motors
Stepping motor
DC Motor
Comparison with competitive products
Advantages as an actuator
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1,Low speed and high torque
-
2,High holding power when no power is supplied
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3,High responsiveness and controllability
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4,Compact and lightweight
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5,Quiet operation
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6,Hollow structure is possible
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7,Non-magnetic
Ideal for MRI environments and as motors for precision positioning robots
Ultrasonic Motor Precision Stage
Compact conveying and indexing equipment
General conveyor system, compact XY conveyor system
Steering mechanism
Active supporter
Ultrasonic motor torque measuring instruments
Piezosonic motor application areas
Research institutes
- Compact, quiet, precision work -
Medical institutions
- Precision, Non-magnetic -
Factory
- Holding torque, precision -
Everyday life
- Support,Assistance -
Control method for ultrasonic motors
Digital signal control (USB application)
Digital signal control (USB application)
Telephone inquiries
03-6379-6020
Business hours
10:00~18:00
(Closed on Saturdays, Sundays, and holidays)
Contact us
Please feel free to contact us with any questions regarding product specifications or to request a quote. You can also purchase our products directly from Amazon.
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