KEMET AE Series Multilayer Piezoelectric Actuators Owner’s Manual

AE Series Multilayer Piezoelectric Actuators
Owner’s Manual

AE Series Multilayer Piezoelectric Actuators

AE Series Resin Coated

Overview
Multilayer piezoelectric actuators are ceramic elements used to convert electrical energy into mechanical energy such as displacement or force by utilizing the piezoelectric longitudinal effect.
KEMET’s multilayer piezoelectric actuators are produced based on our unique element structure design and piezoelectric ceramic materials with high electro strictive factors. Compared to conventional piezoelectric actuators, they are smaller in size but can generate higher displacements and forces at low voltages. The Resin Coated AE series actuators feature compact size and a wide variety of shapes for applications such as ultrafine positioning mechanism and drive sources.
Applications
Typical applications include positioning, auto focusing of optical systems, pumps, mass-flow valves, vibration source, vibration controls, sensors, image stabilization of DSC, mirror/prism positioning, manipulators, motors and printers.
Benefits

• Large generated force of 3,500 N/cm2
• Operating temperature range from −25°C to +85°C
• High-speed response: Driving up to about 1/3 of selfresonant frequency (in several ten kHz)
• Low power consumption: Can be retained at the leakage current state of 100 μA or less
•  Very small size: 1/10 or smaller than conventional multilayer actuators
•  RoHS/REACH compliant

Ordering Information

Compliance
AE = Resin Coated Type| 0505 = 5 mm X 5 mm
(Coating area is not included)|

The last two  digits specify the displacement values.
Example:D44=44μm

| Blank = Standard overall lengths of 5,
10 or 20 H09 = 9
H18 = 18 H40 = 40| D = Thin coating type| Blank = No hole
H0 = With hole| F = RoHS/REACH
Compliant (See “Environmental
Compliance” below)

Application Examples

| Application Examples
---|---
Semiconductor manufacturing system| Clamping actuator of wire bonding, actuator of shaker, actuator of damping system, positioning of light source
Precision machinery, mechatronics| Sewing machine, robot, vibration of parts feeder, positioning of equipment, pressure sensor
Home appliances| Actuator of pump
Audio equipment| Speaker
Imaging equipment| Actuator of resolution improvement, actuator of autofocusing, actuator of damping
Computer, OA equipment| Pressure sensor, positioning of memory device (data storage or others)
Optical equipment| Positioning of stage, actuator of autofocusing, actuator of shaker and damping system
Communications| Polarization control, wavelength control
Medical equipment| Micropump, ultrasonic transducer, manipulators
Measuring instrument| Pressure sensor, acceleration sensor, fine positioning
Automotive| Vibration Control

Element Structure
KEMET’s multilayer piezoelectric actuators are designed using unique element structure technology and proprietary ceramic materials with high electro strictive factors. This particular structure and technology involved provide a unique product with below advantages compared to other similar solutions:
Against electromagnetic actuators

• Faster response
• Higher resolution for positioning
• Large generated force
• Low power consumption
• No electromagnetic noise

Against bimorph piezoelectric actuators

• 7 times the energy conversion efficiency of the bimorph type actuator
• Lower power consumption
• Large generated force
• Stable displacement, reduced shift and creep phenomena
• 100 times the response speed of the bimorph piezoelectric actuator

Against stacked piezoelectric actuators

• Compact size (less than 1/10 the specific volume of the stacked piezoelectric actuator)
•  Low drive voltage
•  Easy to use
• Inexpensive

Dimensions in mm

Outer dimensions in mm Note:
Factory-shipped polarization: Red lead wire = (+)
White lead wire = (−)
Above drawings do not include dimension of wire connection area and diameter of the wire. Please contact KEMET for details.

Dimensions in mm cont.
Wire dimensions in mm Note:
Ød = Diameter of lead wire
ØD = Outer diameter including the thickness of coating
L = Lead wire length
Lead wire : Copper wire with Tin plating
Coating : PTFE (Polytetrafluoroethylene)

AE0203D08H09DF
AE0203D08DF
AE0203D18H18DF
AE0203D16DF
AE0203D44H40DF
AE035035D08H09DF
AE035035D18H18DF
AE0505D04D-H0F
AE0505D08D-H0F
AE0505D08H09DF
AE0505D08DF
AE0505D18H18DF| 26| 0.5| 0.8
AE0505D16DF
AE0505D44H40DF
AE0707D08H09DF| 30| 0.3| 0.5
AE0707D08DF
AE0707D18H18DF| 26| 0.5| 0.8
AE0707D16DF
AE0707D44H40DF
AE1010D08H09DF| 30| 0.3| 0.5
AE1010D18H18DF| 26| 0.5| __ 0.8
AE1010D16DF
AE1010D44H40DF
AE1414D16DF
AE2525D15DF

Dimensions in mm cont.

Performance Characteristics

voltage at ambient temperature. When driven by an AC voltage at ambient temperature plus temperature rise due to heat generation.
Recommended Storage Condition| −5 to +40°C / less than 40% R.H.| No condensation. Recommended storage to be at room temperature.
Maximum Driving Voltage| 150 VDC|
Displacement| See Table 1 – Ratings & Part Number Reference| At 150 VDC
“Generated Force (Compression Resistance)”| See Table 1 – Ratings & Part Number Reference| The force required for restricting the displacement to zero when the maximum driving voltage is applied.
Capacitance| See Table 1 – Ratings & Part Number Reference| f = 1 kHz, V = 1 Vrms (< 10 µF)
f = 120 Hz, V = 1 Vrms (> 10 µF)
Capacitance Tolerance| ±20%|
Dissipation Factor| 5% or less|
Insulation Resistance| See Table 1 – Ratings & Part Number Reference| Value obtained in one minute at 150 VDC.
Resonance Frequency| See Table 1 – Ratings & Part Number Reference| Both ends of the element are in free state.
Typical values of the element under our test conditions.
Tensile Strength| 1/10 of generated force| Typical values of the element under our test conditions.
Young’s Modulus| 4.4 X 1010 N/m2| Typical values of the element under our test conditions.
**** Temperature Cycle Test| Displacement: Initial value ±20% Capacitance: Initial value ±30% tan δ: Less than initial rated value
Insulation Resistance: 1 MΩ or more| Room temperature (3 minutes) At −25°C for 30 minutes
Room temperature (3 minutes) At +85°C for 30 minutes
Repetition of 10 cycles of the above

Environmental Compliance

All KEMET Multilayer Piezoelectric Actuators are RoHS and REACH Compliant.
Article 33(1) of the REACH Regulation states that manufacturers and importers of articles (products) are required to notify their customers of the presence of any Substances of Very High Concern (SVHC) in their products exceeding 0.1% by weight and provide instructions on safe use of the product.
KEMET Corporation reports regarding the Article 33(1) of REACH Regulation as follows:

1. Applicable Product:
   Multilayer piezoelectric actuators (AE, AER, ASB, ASL and AHB Series).

2.  Report for content of REACH SVHC list:
   The product(s) above contain a substance by more than 0.1wt% per product weight that was published in the 8th update of the REACH SVHC substances (December 19, 2012).

3.  Regarding safety of the multilayer piezoelectric actuators (Piezoceramic products):
   The Piezoceramic that is used in this product becomes ceramic by sintering powder containing PZT as a main ingredient. It is chemically stable, with minimum risks toward the human body or environment within the intended use of the product. Please note that risks could occur in the case of inhalation or accidental oral uptake of powder ceramics.

4. Technical product information on the multilayer piezoelectric actuators (Piezoceramic products):
   The manufacturing technique of the “piezoceramic products” whose main ingredient is Lead Titanium Zirconium Oxide (PZT) has been established, and there is no alternative material that can exhibit superior performance than PZT at this moment. Please note that the piezoceramic is listed as an exempt on RoHS (2011/65/EU) Annex III (7c.1).

5. Responsibility of piezoceramic manufacturers:
   Piezoceramic manufacturers report information regarding PZT containment in their products to the customers to obey the article 33 of the REACH regulation.

Table 1 – Ratings & Part Number Reference

Custom Design Parts
Customized parts are available on request. Please contact KEMET.
Below guidelines can be used as reference regarding generated displacement and generated force.

Displacement Generated Force
Product Cross Section
Product Length
Product Shape| Roughly proportional to the length of the element
Roughly proportional to the sectional area of the element
1 x 1 mm square or larger 1 mm or longer
Available in cylindrical ring or other shapes

Electrical Characteristics

Notes:

• Listed data are reference values. For the voltage vs. displacement characteristics, the same length of piezo series shows the same voltage vs. displacement characteristics.
• Definition of generated force for figures 2, 3 and 4: force required for restricting the displacement to 0 when the maximum driving voltage is applied.

Electrical Characteristics cont.

Packaging

AE035035
AE0505
AE0707| 4
AE1010
AE1414| 1
AE2525

Reliability
The majority of failure modes on multilayer piezoelectric actuators are short- circuits due to degraded insulation. Although the cause of degradation of insulation has not been clarified, it has been found that the failure rate varies greatly between static uses (DC voltage application) and dynamic uses (pulse voltage application). Like other electrical components, piezoelectric actuators can be affected by humidity as well as applied voltage and ambient temperature.
This section describes reliability guidelines for static and dynamic usage of the resin coated type actuators. Reliability of our multilayer piezoelectric actuators is represented by MTTF (mean time to failure) in case of static usage.
DC Voltage Application
The acceleration factors have been obtained empirically for each of the drive voltage, ambient temperature and relative humidity based on many experimental results. The MTTFr in actual applications is estimated using equation (1) below with MTTFs observed under accelerated conditions as the reference value.
(1) MTTFr = MTTFs × Av × Ah × At
MTTFr : Estimated value
MTTFs : Reference value (= 500 hours)

Av: Acceleration factor for drive voltage = (150/Vr) 3.2| Vr : Actual voltage (V)
---|---
Ah : Acceleration factor for relative humidity = (90/Hr )4.9| Hr : Actual relative humidity (RH%)
At : Acceleration factor for ambient temperature = 1.5 (40 −Tr)/10| Tr : Actual ambient temperature (°C)

The following calculation is made for the case of use at 25°C, 60% RH and 100 V.
MTTFr = 500 × (150/100)3.2  × (90/60)4.9  × 1.5 (40−25)/10

= 500 × 3.66 × 7.29 × 1.84

≈24,500hours(2.8years)
Pulse Voltage Application
In driving dynamic applications, temperature rises as a result of self-heating allowing the component not to be affected by the humidity, thus extending the operational lifetime. This phenomenon is explained as a result of the humidity factor elimination caused by the self-heating.
Since the self-heating value is affected by multiple factors such as the element’s shape, pulse waveform and frequency, it is difficult to estimate the actual rising value. Therefore, the life of the actuator cannot be determined by using an equation, unlike the case of DC voltage applications. When testing the AE0203D08DF part, there was no failure confirmed after 500 hours end of the pulse driving test. (500 Hz, 0 – 150 V rectangular pulse).
Users should be careful about the influence of physical damage which can be caused by the fixing method of the element and/or the driving conditions.

User’s Guide

Fixing Method

• Carefully prevent the piezoelectric actuators from being bent, twisted or applied tensile force. Reference: Twisting and Tension Tolerance

| Reference Value| Remarks
---|---|---
Twisting Force| 3 × 10−1 N • m or less| For an actuator which generates a force of 800 N (compression resistance).
Tension| 50 N or less|

• Install the actuator so that the center axis of the generated displacement is aligned with the center axis of the load.
• Epoxy-based adhesives are recommended for bonding. Select adhesives that have high rigidity and allow for medium thickness so that the generation force and displacement cannot be deteriorated. Also, do not form adhesives on the side of the actuator.
• When thermosetting resin is used, perform polarizing treatment (see caution section) after the adhesive is settled.
• The resin coated type is weak to the tensile force due to its structure and may be broken when tensile forces are applied onto the device. Using the device in the state that constantly applies compression is effective against any mechanical damage. The pressure applied to this element should be kept at 20% to 50% of the force generated by this element  (compression resistance).
• Install the element so that the axis of generated displacement is vertical to the mounting surface.

Example of Actuator mounting : a) Example of wrong mounting Imperfect alignment between actuator and load b) Example of correct mounting Mount the device so that the load is uniformly applied by the spherical surface or the hinge

Driving Method

• Connect the red lead wire to the positive (+) terminal of the power supply. Also prevent reverse voltage application.
• In driving applications, it is necessary to take consideration of hysteresis, ringing, creep, and other similar phenomenons.
• For pulse driving, it is also necessary to be aware of self-heat generation, charge/discharge current, and the power supply’s impedance.

Generated Force and Load Relation
Static load: No load value changes when actuator moves. Protective resistor R1＝1kΩ
Protective resistor R2＝1kΩ
Polarizing conditions: DC voltage application 0V→150±0.2V (to be retained for 10 seconds) →0
Fluctuating load: Load value changes by spring reaction when actuator moves. Spring toad (Fluctuating load): Displacement is changed by relation between generated force and spring constant of actuator.

Handling Precautions

Precautions to be taken when using multilayer piezoelectric actuators (Please read these precautions before using our products)

1. Before using or designing a system using our products, read the precautions and specifications listed below.
2.  The main failures with multilayer piezeoelectric actuators are deterioration of insulation resistance, short-circuit and open-circuit. Before using the products, systems should be designed carefully to ensure redundancy, prevention of the spread of fire, and prevention of faulty operation allowing occurrence of failures.
3.  Use the products after checking the working conditions and rated performance of each multilayer piezoelectric actuator series. Selection of AE or AER Series (resin coated type) or ASB, ASL or AHB Series (metal sealed type) should be based on the intended working temperature and humidity.

• Connect the red lead wire to the positive (+) terminal of the power supply.
• Avoid electric shocks since a high voltage is in use.
• Never apply excessive tension to a lead wire.
• Do not handle the product by picking up or moving the lead wire.
• Machining of the actuator element and replacement of the lead wire are prohibited.
• Do not handle the resin coated type (AE series) with bare hands.
• Do not wash the resin coated type (AE series) with organic solvents.
• Avoid excessive physical shock. Otherwise, the internal piezoelectric ceramic element may be damaged.
•  If the actuator is exposed to high temperatures above 100°C or if used after long storage periods (more than three months), the device should be polarized by using the circuit configuration and conditions shown at right.
•  Do not apply voltage exceeding maximum rating voltage, or rapid charging and discharging.
• Do not use the actuator in high concentrations of highly inflammable gas.
•  Align the center axis of displacement of the actuator with the center axis of the mechanical load.
• When operated, the transient response time of the actuator should be less than 1/3 of the resonant frequency in order to prevent damage by ringing.
• Store the resin coated type preferably in a dry atmosphere (desirably below 40% RH) at ordinary temperatures (-5°C to +40°C). Avoid condensation on the product’s surface.
• Store actuators where there is no vibration.
• Handle products properly as industrial waste. When disposing, please contact your local waste disposal service and make sure the disposal methods meet all legal requirements.

KEMET Electronics Corporation Sales Offices
For a complete list of our global sales offices, please visit www.kemet.com/sales.
Disclaimer
All product specific cations, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such applications, but are not intended to constitute – and KEMET specifically disclaims – any warranty concerning suitability for a specific customer application or use. The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards (such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other measures may not be required.
When providing KEMET products and technologies contained herein to other countries, the customer must abide by the procedures and provisions stipulated in all applicable export laws and regulations, including without limitation the International Traffic in Arms Regulations (ITAR), the US Export Administration Regulations (EAR) and the Japan Foreign Exchange and Foreign Trade Act.
The above information is believed to be correct but does not purport to be all inclusive and must be used only as a guide.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com

KEMET is a registered trademark of KEMET Electronics Corporation.
© KEMET Electronics Corporation
KEMET Tower
One East Broward Boulevard
Fort Lauderdale, FL 33301 USA
954-766-2800
 www.kemet.com

References

• KEMET – A YAGEO Company
• KEMET – A YAGEO Company
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