Multilayer stacked piezoelectric actuator: by TOKIN
Multilayer piezoelectric actuators are ceramic elements for converting electrical energy into mechanical energy such as displacement or force by utilizing the piezoelectric longitudinal effect.
This multilayer stacked actuator is resin coated and can be applied on ultra-fine positioning mechanisms and drive sources.
Basic information is per the following, for reference purpose TOKIN’s catalogue can be downloaded from the button below.
- Highly responsive
- High conversion efficiency from electrical to mechanical energy （approx. 60%）
- High mechanical energy generation per unit volume （approx. 20 mJ per 1 cm³）
- High output force （approx. 3500N per 1 cm² of cross sectional area）
- Good energy source for mechanical transformer
- Accurate positioning: Controllable in nm order
- Low power consumption: Can be retained at the leakage current state (100μA or less)
TOKIN’s Multilayer Piezoelectric Actuator
Internal Structure Diagram
Positioning, Auto focusing of optical system, Pumps, Valves, Vibration source, Vibration controls, Sensors, Image stabilization of DSC, Mirror / Prism positioning, Manipulators, Motors, Printer, etc.
Specifications & Price
|Product||Applied Voltage 150V
|Applied Voltage 100V
*The value was calculated based on the displacement value and Young’s modulus – 4.4 X 1010 N/m2
**Capacitance allowance: +/- 20% [Condition: f=1kHz, V=1Vms (<10μF); f=120Hz, V=1Vms (>10 μF)]
***Price stated does not include shipping cost and is negotiable if per order is greater than 50 units.
|Operating temperature range||-25 to ＋85℃||When applied with a DC voltage: Ambient temperature When driven by an AC voltage: Ambient temperature + Temperature rise due to generated heat|
|Recommended Storage condition||-5 to ＋40℃ / less than 40%R.H||Recommend storage at room temperature.
|Dissipation factor||5% or less|
|Tensile strength||1/10 of generated force|
|Temperature cycle test||Displacement: Initial value ±20%
Capacitance: Initial value ±30%
tanδ: Less than initial rated value
Insulation resistance: 1MΩ or more
Appearance: No noticeable defect
|Room temperature （3 min）
Room temperature （3 min）
Repetition of 10 cycles of the above
(Data source: TOKIN catalogue – Multilayer Piezoelectric Actuators)
Piezo actuators can be influenced by humidity as well as applied voltage and ambient temperature.
Reliability of Tokin’s multilayer piezoelectric actuators for static usage is represented by MTTF (mean time to failure). The following description is only based on obtained data.
DC voltage application
The MTTFr in actual applications is estimated using equation (1) below with MTTFs observed under accelerated condition as the reference value.
Pulse voltage application
Temperature rises when driven by pulse voltage as a result of heating due to dielectric loss of ceramics.
Therefore the element is less influenced by humidity. The effect is affected by the element shape, pulse waveform and frequency, which cannot be calculated by an equation as in the case of DC voltage application.
In TOKIN’s testing on the AE0203D08, there was no failure confirmed after 0-150V rectangular pulse wave applied with 500Hz for 500 hours (equivalent to 900 million pulses applied).
Caution: Physical damage may occur due to ringing phenomenon caused by fixed method of the element and voltage rise speed.
* For reliability purposes, avoid handling these piezoelectric actuators (resin-coated) with bare hands, avoid excessive physical shock, and store preferably in a dry atmosphere (below 40% RH) at ordinary temperatures (-5 to +40oC), without vibration. Avoid condensation on the product surface.
* Center axis of generated displacement to be aligned with the center axis of the load. Axis of the generated displacement to be vertical to the mounting surface.
* Prevent from being bent, twisted, tensile force applied (including the lead wire), as well as physical shock.
Reference: Guide for tolerance of twisting and tension
|Twisting force||3 X 10-1 N.m or less||For an actuator which generates a force of 800 N (compression resistance)|
|Tension||50N or less|
* If the actuator is exposed to high temperature above 100oC or it is used after long storage period (more than 3 months), it should by polarized using the circuit configuration and conditions shown below.
* Epoxy-based adhesives with high rigidity and minimum thickness are recommended for bonding. Do not form adhesives at the side of actuator.
* For thermosetting resin, perform polarizing treatment (mentioned above) again after the adhesive is settled.
Electrical connection and handling precautions
Connect the red lead wire to the positive (+) terminal of the power supply. Also prevent reverse voltage application.
Basically the voltage controls the aimed displacement and generated force.
・In driving, it is also necessary to take ringing due to the resonance or hysteresis of the element itself into consideration. Driving the actuator so that the rising speed is more than 3 times as much as the resonance period to prevent the device from ringing damage.
・In pulse driving, it is further necessary to pay sufficient attention to heat generation due to dielectric loss, charge/discharge current due to the capacitive component and the power output impedance as well.
Generate force and load relation
Static load: No load value change when actuator moves
Fluctuating load: Load value changes by spring reaction when actuator moves.