Micromechatronics, Inc. (MMech)

www.mmech.com - Ph: 814-861-5688

General Piezo Symbols

Noliac Piezo Actuators

Symbol Description Unit General/Noliac
A Electrode surface area mm2 N
c Stiffness coefficent
N/m2 G
C Capacitance F
G
d
Piezoelectric charge coefficient
C/N G
f
Frequency
Hz
G
fmax
Maximum frequency
Hz
N
fa Anti resonance frequency
Hz
G
fr
Resonance frequency
Hz
G
Fb Blocking force
N
N
F dyn
Dynamic Force
N
N
g
Gravitational constant
kg.m/s2
G
gij Piezoelectric voltage coefficient V.m/N G
H
Height
mm
N
I Current A G
Iavg Average Current A N
Imax Maximum Current A N
IE Current Closed Circuit V N
ID Inner Diameter mm N
k Coupling factor G
k Stiffness of actuator N N
K0 Spring constant N N
K Relative dielectric constant - G
I0 Nominal Displacement m N
L Length mm N
Lc Clamping length (on plate benders) mm N
?L Maximum free displacement µm N
m Mass kg N
meff Effective Mass kg N
n Number - N
N Frequency constant Hz.m N
OD Outer diameter mm N
ODm Maximum outer diameter mm N
P Power W G
Q Charge C G
Qm Mechanical factor - G
s Elastic compliance m2/N G
s Stroke µm N
t Time s G
tp Minimum rising time in pulsed operation s N
tr Period time of actuator's resonance s N
t0 Arbitrary time when measurement started s N
tan ? Dissipation factor - G
T Thickness / height of internal ceramic layers µm N
Tc Curie temperature °C G
Y Young's Modulus N/m2 G
U Voltage V N
Upp Voltage peak to peak V N
UD Voltage Open Circuit V N
W Width mm N
Wm Maximum Width (including external electrodes) mm N
?o Permittivity of free space (8.854x10-12) F/m G
?T Permittivity F/m G
? Density g/mm3 G

Subscript:

31 = direction perpendicular to polarisation field

33 = direction parallel to polarisation field

m = maximum

scma = Stacked Ceramic Multilayer Actuator

cma = Ceramic Multilayer Actuator

0 = original

in = in / beginning

p = planar (f.ex. coupling factor)

t = thickness/ height (f.ex. coupling factor)

b = blocking force

Superscript:

D = Open Curcuit

E = Closed Circuit