Bi-laminar Multilayer Benders or BimorphsActuator OutlineReferencesMajor ApplicationsBasic Working Principle (cont)Basic Working PrincipleBasic Working Principle (cont.)Slide 8Slide 9Slide 10Sample ConfigurationSample Configuration (cont.)Slide 13Slide 14Major SpecificationsMajor Specifications (cont.)Slide 17Slide 18Slide 19LimitationsLimitations (cont.)Slide 22Slide 23Best Choice For ApplicationBest Choice For Application (cont.)Cost ValuesBi-laminar Multilayer Bi-laminar Multilayer Benders or BimorphsBenders or BimorphsPrepared By: Brad CrookPrepared By: Brad CrookECE 5320 MechatronicsECE 5320 MechatronicsAssignment #1Assignment #1Actuator OutlineActuator OutlineReferencesReferencesMajor ApplicationsMajor ApplicationsBasic Working PrincipleBasic Working PrincipleSample ConfigurationSample ConfigurationMajor SpecificationsMajor SpecificationsLimitationsLimitationsBest Choice For ApplicationsBest Choice For ApplicationsCost ValuesCost ValuesReferencesReferenceshttp://www.http://www.americanpiezoamericanpiezo.com/products_services/stripe_actuators.com/products_services/stripe_actuators.html.htmlhttp://www.ulb.ac.be/scmero/documents/thttp://www.ulb.ac.be/scmero/documents/these/Piefort01.pdfhese/Piefort01.pdfhttp://www.physikinstrumente.de/producthttp://www.physikinstrumente.de/products/prdetail.php?sortnr=103000s/prdetail.php?sortnr=103000Major ApplicationsMajor ApplicationsNano-positioningNano-positioningNeedle control in textile weavingNeedle control in textile weavingBraille machinesBraille machinesAccelerometersAccelerometersOpening/closing valvesOpening/closing valvesSmall volume pumpingSmall volume pumpingSwitching applications-touch switchesSwitching applications-touch switchesCooling devicesCooling devicesBasic Working Principle (cont)Basic Working Principle (cont)A bi-laminar actuator is made from a A bi-laminar actuator is made from a piezoelectric smart material that returns piezoelectric smart material that returns to its original shape after a force is to to its original shape after a force is to applied to it.applied to it.A piezoelectric material can act as both a A piezoelectric material can act as both a sensor and an actuator.sensor and an actuator.http://www.americanpiezo.com/products_services/strhttp://www.americanpiezo.com/products_services/stripe_actuators/stripe_background.htmlipe_actuators/stripe_background.htmlBasic Working PrincipleBasic Working Principle““A flexing or bending actuator is A flexing or bending actuator is designed to produce a relatively large designed to produce a relatively large mechanical deflection in response to an mechanical deflection in response to an electrical signal.” electrical signal.”http://www.americanpiezo.com/products_services/strhttp://www.americanpiezo.com/products_services/stripe_actuators/stripe_background.htmlipe_actuators/stripe_background.htmlBasic Working Principle (cont.)Basic Working Principle (cont.)““Two thin strips of piezoelectric ceramic Two thin strips of piezoelectric ceramic are bonded together, usually with the are bonded together, usually with the direction of polarization coinciding, and direction of polarization coinciding, and are electrically connected in parallel.”are electrically connected in parallel.”Courtesy of American Piezohttp://www.americanpiezo.com/products_services/strhttp://www.americanpiezo.com/products_services/stripe_actuators/stripe_background.htmlipe_actuators/stripe_background.htmlBasic Working Principle (cont.)Basic Working Principle (cont.)““When electrical input is applied, one When electrical input is applied, one ceramic layer expands and the other ceramic layer expands and the other contracts, causing the actuator to flex.”contracts, causing the actuator to flex.”+- + -Vin>0VVin=0Vhttp://www.americanpiezo.com/products_services/strhttp://www.americanpiezo.com/products_services/stripe_actuators/stripe_background.htmlipe_actuators/stripe_background.htmlBasic Working Principle (cont.)Basic Working Principle (cont.)““Deflections are large, but blocking Deflections are large, but blocking forces are low, relative to forces forces are low, relative to forces developed by stack actuators.” developed by stack actuators.” Courtesy of American Piezohttp://www.americanpiezo.com/products_services/strhttp://www.americanpiezo.com/products_services/stripe_actuators/stripe_background.htmlipe_actuators/stripe_background.htmlBasic Working Principle (cont.)Basic Working Principle (cont.)““Parallel electrical configuration ensures Parallel electrical configuration ensures high sensitivity to input; bias voltage high sensitivity to input; bias voltage circuitry can prolong the life of the circuitry can prolong the life of the actuator by eliminating the potential for actuator by eliminating the potential for depolarizing the ceramic layers.”depolarizing the ceramic layers.”http://www.ulb.ac.be/scmero/documents/these/Pieforthttp://www.ulb.ac.be/scmero/documents/these/Piefort01.pdf01.pdfSample ConfigurationSample ConfigurationA bilaminar design consists of two A bilaminar design consists of two piezoelectric substrates bonded piezoelectric substrates bonded together with polarization coinciding and together with polarization coinciding and with an electrode sandwiched in-with an electrode sandwiched in-between.between.+-+-+-+-+-+-+-+-+-+-+-+-PZTElectrodeSample Configuration (cont.)Sample Configuration (cont.)The outer surface is coated with the The outer surface is coated with the another electrode, and a laminate is another electrode, and a laminate is placed on top to protect the actuator.placed on top to protect the actuator.+-+-+-+-+-+-+-+-+-+-+-+-ElectrodePZTElectrodeElectrodeSample Configuration (cont.)Sample Configuration (cont.)The outer electrodes are tied to an optional The outer electrodes are tied to an optional positive or negative electrode, and the inner positive or negative electrode, and the inner electrode is tied to the opposite pole of the electrode is tied to the opposite pole of the outer. This determines the direction of bending.outer. This determines the direction of bending.+-+-+-+-+-+-+-+-+-+-+-+-ElectrodePZTElectrodeElectrode+-Sample Configuration (cont.)Sample Configuration (cont.)Other configurations are pre-bent into a Other configurations are pre-bent into a C-shape that can straighten, or bend C-shape that can straighten, or bend with
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