ROBA-stop
®
-M – Brake Dimensioning
Brake Dimensioning
Friction work
per 0,1 mm
wear
Standard brake
Type 891.0 _ _._
2
Q
r 0,1
[10
6
J/0,1]
35
40
65
100
130
130
140
150
160
200
Holding brake
Type 891.1_ _._
Q
r 0,1
[10
6
J/0,1]
7
8
13
20
30
65
70
75
80
100
Friction work
on rotor
replacement
Standard brake
Type 891.0 _ _._
2
Q
r tot.
[10
6
J]
95
100
162
500
600
700
840
950
1000 2000
Holding brake
Type 891.1_ _._
Q
r tot.
[10
6
J]
7
8
13
20
45
130
170
300
350
500
Mass
moment
of inertia
rotor + hub
on d
max
Type 891.0 _ _._
1
(Metal rotor)
J
[10
-4
kgm²] 0,12
0,21
0,67
1,74
4,48
6,74 16,54 31,68 61,82 222,6
Type 891.2_ _._
(Friction lining rotor)
J
[10
-4
kgm²]
0,1
0,17
0,58
1,53
4,1
-
-
-
-
-
Weight
Standard brake
Type 891.0 _ _._
2
m
[kg] 0,76
1,1
1,8
3,4
4,5
7,4
13,6
19,2
33,3
38
Holding brake
Type 891.1_ _._
m
[kg] 0,76
1,1
1,8
3,4
4,5
7,4
13,6
19,2
33,3
38
Please Observe!
Due to operating parameters such as slipping speed, pressing or temperature, the
wear values
can only be considered
guideline values
.
When using a brake with a friction disk (Type 891._ _2._), the max. friction work and friction power must be reduced by 30 % for sizes 2 to
16 and by 50 % for sizes 32 – 60.
The wear values Q
r 0,1
and Q
r tot.
are therefore not valid.
1. Brake selection
Key:
M
req.
=
9550 x P
x K
≤
M
2
[Nm]
J
[kgm²]
Mass moment of inertia
n
K
[-]
Safety factor
(1 – 3 x acc. to conditions)
t
v
=
J x n
[sec]
9,55 x M
v
M
req.
[Nm]
Required braking torque
t
4
=
t
v
+ t
1
[sec]
M
v
[Nm]
Delaying torque
M
v
=
M
2
+ (-)* M
L
[Nm]
M
L
[Nm]
Load torque * sign in brackets is valid if load
is braked during downward movement
. Inspection of thermic load
M
2
[Nm]
Nominal torque (Technical Data page 4)
Q
r
=
J x n²
x
M
2
[J/braking]
n
[rpm]
Speed
182,4
M
v
P
[kW]
Input power
t
v
[s]
Braking action
The permitted friction work (switching work) Q
r perm.
per braking for
the specified switching frequency can be taken from the friction-
power diagrams (page 9).
If the friction work (switching work) per braking is known, the max.
switching frequency can also be taken from the friction-power
diagrams (page 9).
t
1
[s]
Connection time (Table 6 page 10)
t
4
[s]
Total switch-on time
Q
r
[J/braking]
Friction work present per braking
Q
r 0,1
[J/0,1]
Friction work per 0,1 wear (Table 4)
Q
r tot.
[J]
Friction work up to rotor replacement (Table 4)
Brake Size Selection
Mass Moment of Inertia
Size
Rotor + hub at d
max
4
8
16
3
60
100
150
50
500
1000
Type 891.0
1
_ _._
(Metal rotor)
J
R+H
[10
-4
kgm²] 0,12
0,21
0,67
1,74
4,48
6,74
16,54 31,68 61,82 222,6
424
Type 891.2_ _._
(Friction lining rotor)
J
R+H
[10
-4
kgm²]
0,1
0,17
0,58
1,53
4,1
-
-
-
-
-
-
Table 5
Friction Work
Size
4
8
16
3
60
100
150
50
500
1000
Per 0,1 mm
wear
Standard brake
Type 891.0
2
_ _._
Q
r 0,1
[10
6
J/0,1]
35
40
65
100
130
130
140
150
160
170
180
Holding brake
Type 891.1_ _._
Q
r 0,1
[10
6
J/0,1]
7
8
13
20
30
65
70
75
80
85
90
Up to rotor
replacement
Standard brake
Type 891.0
2
_ _._
Q
r tot.
[10
6
J]
95
100
162
500
600
700
840
950
1000
1700
2000
Holding brake
Type 891.1_ _._
Q
r tot.
[10
6
J]
7
8
13
20
45
130
170
300
350
425
540
Table 4
88
