Beckhoff AL2000 Application Manual de usuario Pagina 22

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22
Used symbols
symbol unit description
t s time
t
a,
t
d
t
ad
time needed for acceleration, deceleration or both
t
c
time needed to cover a distance at constant speed
Dt small time difference
T total time
v m/s velocity
v
a
velocity after acceleration from stand still
v
max
maximum velocity
a m/s² acceleration
x m distance
x
a
, x
d
, x
c
distance covered by acceleration, deceleration or constant speed
X total distance of a combined movement (t
a
+ t
c
+ t
d
)
F N force
F
a
, F
d
, F
ad
force needed for acceleration and/or deceleration
F
l
force applied by the load (like processing contact forces)
F
peak
motor´s peak force
F
cont
motor´s continuous force
F
f
friction force
F
rms
mean force over a longer period (root mean square)
M kg mass of the load
Q W dissipated power
S
25
N²/W motor constant (slope) at 25°C
S
TW
motor constant at working temperature
K N/A motor force constant
K
rms
mean motor force constant (depending on the current)
I A current
I
peak
motor´s peak current
I
cont
motor´s continuous current
R
th
°C/W thermal resistance
T
W
°C working temperature
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