Preface and general information
INTORQ | BA 14.0196 | 04/2016
7
1.4
Abbreviations used
Letter symbol Unit
Designation
F
R
N
Rated frictional force
I
A
Current
I
H
A
Holding current, at 20 °C and holding voltage
I
L
A
Release current, at 20 °C and release voltage
I
N
A
Rated current, at 20 °C and rated voltage
M
A
Nm
Tightening torque of fixing screws
M
dyn
Nm
Braking torque at a constant speed of rotation
M
K
Nm
Rated torque of the brake, rated value at a relative speed of rotation of
100 rpm
n
max
rpm
Maximum occurring speed of rotation during the slipping time t
3
P
H
W
Coil power during holding, after voltage change-over and 20 °C
P
L
W
Coil power during release, before voltage change-over and 20 °C
P
N
W
Rated coil power, at rated voltage and 20 °C
Q
J
Quantity of heat/energy
Q
E
J
Maximally permissible friction energy for one-time switching, thermal
parameter of the brake
Q
R
J
Braking energy, friction energy
Q
Smax
J
Maximally permissible friction energy for cyclic switching, depending on the
switching frequency
R
N
Ohms
Rated coil resistance at 20 °C
S
h
1/h
Switching frequency: the number of switching operations evenly spread
over the time unit
S
hue
1/h
Transition switching frequency, thermal parameter of the brake
S
hmax
1/h
Maximum permissible switching frequency, depending on the friction
energy per switching operation
s
L
mm
Air gap: the lift of the armature plate while the brake is switched
s
LN
mm
Rated air gap
s
Lmin
mm
Minimum air gap
s
Lmax
mm
Maximum air gap
t
1
ms
Engagement time, sum of the delay time and braking torque - rise time
t
1
= t
11
+ t
12
t
2
ms
Disengagement time, time from switching the stator until reaching 0.1 M
dyn
t
3
ms
Slipping time, operation time of the brake (according to t
11
) until standstill
