Piezoceramic bimorphs
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Simple structure and easily applicable |
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Displacement of hundreds of obtainable at low voltage |
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Low power consumption |
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No heat generation |
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No electromagnetic noise generation |
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Piezoceramic relays |
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Bimorph fans |
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Piezoceramic valves |
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Flow sensors |
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| Structural figure of bimorph (reference example) |
|
PZBA00030 |
PZBA00031 |
| Length of element(L) |
48mm |
33mm |
| Substantial length |
65mm |
43mm |
| Width |
20mm |
4mm |
Piezoceramic bimorphs are composed of a metal plate sandwiched between
two piezoceramic plates polarized which have terminals imbedded and are
bonded together. When voltage is applied to the bimorph with this structure,
upper piezoceramic element get shorter by piezoelectric effect and lower
one get longer. It follows that bimorph becomes warp upward as a whole.
Electrical energy ⇒ mechanical energy
The displacement (gL) and its force (F) at the tip of it are shown as
the following equation.
Theoretical equation
| Displacement (m) |
 |
| Displacement force (N) |
 |
| Type |
Voltage |
Displacement |
Electrostaic capacity |
Resonancefrequency |
| PZBA00030 |
DC70V |
0.6 mm |
140nF |
103Hz |
| PZBA00031 |
DC70V |
0.3 mm |
20nF |
190Hz |
|
 |
|
| Example of drive circuit (block diagram) |
 |
| Frequency in use |
About 60Hz (Displacement : 1.5mm)
About 170Hz (Displacement : 3.5mm) |
|
Square wave
|
Input voltage
(Voltage applied to bimorph) |
140Vp - p |
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