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Special designs
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— Brakes —
All Kaiser motors can be supplied with attached
brake.
Standard: single-disc spring-energy brake with
direct current excitation (fail-safe brake).
Standard rotor with plastic carrier on splining,
axially moveable. Armature disc noise-dampened and rustproof.
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Special designs: metal rotor with frequent utilization
of the limit values according to the table below (hoists, industrial
trucks) - manual ventilation - dust protection ring - type of
protection IP 65
Nominal voltage: 205 V = for connection to 220
- 240 Volt 50/60 Hz via supplied bridge-connected rectifier;
or upon request: 24 V = without rectifier for connection to
customer's own control voltage system. Other voltages upon request.
Other brake systems (e.g. electromagnetic
single-disc brakes (magnetically operated brake) upon request.
Layout of brake motors
i. Holding brakes
Holding brakes are brakes which are generally
applied during standstill and should only prevent a barring of
the de-energized drive.
For this application, brakes with
are used.
ii. Positioning brakes
Positioning brakes are brakes which are to bring the drives into
a defined position with a defined switching frequency from full
speed.
Normally brakes with
are selected in this case.
As the braking from higher speeds converts kinetic energy into
heat, a thermal checking of the selected brake is advisable.
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+ with a braking load
- with a driving load
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The brake time can be calculated as follows
Attention! The switching
times stated in the technical data refer to the d.c.-side switching.
With a.c.-side switching, the values increase sixfold
Checking the motor
With switching frequencies of more than 20 h¨¹ or external
moments of inertia of more than double the motor moments of inertia,
the dimensioning of the motor is to be checked.
An exact calculation is only possible using the motor characteristics
with knowledge of the heat dissipation possibilities under the
existing ventilation conditions.
We have computer programs for the exact calculation
procedure. We need the following information from you in this
respect:
total moment of inertia referring to the motor
speed or
single moment of inertia with pertaining speeds
load torque during acceleration
load torque during operation
load torque during braking
operating time and switching frequency resp. cycle times
Please use this service which is free of
charge.
Nomenclature
| J |
total
moment of inertia |
kgcm |
| Mb |
basic
torque of brake |
Nm |
| MI |
load
torque |
Nm |
| Mm |
basic
torque of motor |
Nm |
| Pn |
basic
torque of motor |
kW |
| Pr |
friction
capacity |
W |
| Q |
switching
work |
kWs |
| n |
speed |
min |
| nn |
rated
speed of motor |
min |
| s |
switching
frequency |
h |
| tb |
braking
time |
ms |
| ts |
switching
time |
ms |
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Drawing
1 intermediate flange
2 rotor with brake lining
3 toothed hub
4 magnetic part with coil
5 armature disc
6 pressure spring
7 pressure piece
8 adjusting ring for braking torque
9 fillister-head screws
10 readjusting sleeve
11 countersunk screws
12 dust protecting ring
13 manual ventilation lever
a air gap, measured in braked condition.
The basic torque can be reduced by approx. 40 % on the adjusting
ring 8. |
| Motor size |
extension of the dimensions "o"
and "k" due to brake attachment additional weight
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DN 63.....................mm
kg
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45
1,2 |
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DN 71.....................mm
kg
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54
1,3 |
54
2,0 |
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DN 80.....................mm
kg
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64
1,4 |
64
2,1 |
64
3,6 |
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DN 90.....................mm
kg
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74
3,8 |
74
5,1 |
74
7,4 |
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DN 100...................mm
kg
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76
3,8 |
76
5,1 |
76
7,4 |
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DN 112...................mm
kg
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68
4,1 |
68
5,4 |
85
7,4 |
85
9,7 |
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DN 132...................mm
kg
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79
8,8 |
79
10,9 |
98
16,8 |
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DN 160...................mm
kg
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122
17,7 |
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brake
basic torque .....................Nm
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4 |
8 |
16 |
32 |
60 |
80 |
150 |
240 |
360 |
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size
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06 |
08 |
10 |
12 |
14 |
16 |
18 |
20 |
25 |
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coil power ....................W
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20 |
25 |
30 |
40 |
50 |
55 |
65 |
75 |
100 |
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switching time ...................ms
switching d.c.-side
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17 |
35 |
40 |
50 |
65 |
90 |
110 |
200 |
270 |
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max. friction power ...............W
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60 |
90 |
120 |
180 |
210 |
240 |
300 |
375 |
450 |
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max. friction capacity kWs
acc. to switching clearance
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3 |
6 |
12 |
24 |
30 |
36 |
60 |
80 |
120 |
max. friction work 
kWs
up to readjusting |
3,6 |
7 |
13 |
35 |
57 |
90 |
95 |
185 |
295 |
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Nennluftspalt.............min. mm
max. mm
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0,2
0,5 |
0,2
0,5 |
0,2
0,5 |
0,3
0,75 |
0,3
0,8 |
0,3
1 |
0,3
1 |
0,4
1,25 |
0,4
1,4 |
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min. rotor thickness..........mm
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4,3 |
5,3 |
7,3 |
6 |
6 |
7 |
8 |
9,6 |
12,5 |
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moment of inertia ........ kgcm²
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0,165 |
0,467 |
2,18 |
3,98 |
10 |
11,9 |
27,1 |
76,3 |
176 |
hole diameter -  ..............mm |
11 |
15 |
20 |
25 |
30 |
30 |
40 |
40 |
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Max. hole diameter - .......mm |
12 |
15 |
24 |
28 |
34 |
38 |
45 |
50 |
70 |
Notes on the previous table
standard parallel key acc. to DIN 6885/1 also with
max. hole.
The max. hole determines the maximum possible diameter of a second
shaft end. Bigger diameters are possible by using a low parallel
key acc. to DIN 6885/3. Avoid reversing operation!
When attaining the max. nominal air gap, the brake must be readjusted
to min. nominal air gap. The rotor thickness is to be checked.
If the min. rotor thickness has been reached, the brake should
be renewed.
Larger brakes than those brakes in the table provided with dimensions
cannot be attached with a standard ventilation.
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