Piezo Stack Actuator Characterization
When considering piezo-actuators for your application, it is critical to verify that their use will benefit your application in a way that alternative solutions will not. In many cases, piezo-actuators will be ruled out simply for cost reasons. Similarly, piezo-actuators could also be the only effective choice. The shift needed, forces involved, desired dynamics and necessary design advantages unique to piezo-actuators will determine their relevance. The mix of traits needed will clarify which type of actuator might be most appropriate.
Specific traits of piezo stack actuators:
- Forces
- High load capability up to tons
- High force/pressure generation (kiloNewtons)
- Super position of high static payload and dynamic force modulation
- Low mechanical compliance (high natural frequencies) solid-state body
- Shift
- Unlimited positioning sensitivity
- Actually proven down to the picometer range
- Dynamics (depends upon electrics as well)
- No delay in mechanical reaction (µsec-range)
- Very high acceleration rates
- Very high mechanical power generation
- Design Advantages
- "Exotic" driving conditions applicable (vacuum, cryogenic temperatures etc.)
- Compact design
- High mechanical power density even in miniature structures
- Power consumption only when motion is generated
- No stand-by/no sustained energy consumption.
From left to right: High voltage bulk stack, Low voltage bulk stack, high voltage ring actuator, low voltage ring actuator  |
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