Product description
Kendrion INTORQ | BA 14.0224 | 02/2021
12
3.3
Function
This brake is an electrically releasable spring-applied brake with a rotating brake disk (rotor) that is
equipped on both sides with friction linings. In its de-energized state, the rotor is clamped with braking
force applied by pressure springs between the armature plate and a counter friction surface. This corre-
sponds to a fail-safe functionality.
The brake torque applied to the rotor is transferred to the input shaft via a hub that has axial gear teeth.
The brake can be used as a holding brake, as a service brake, and as an emergency stop brake for high
speeds.
The asbestos-free friction linings ensure a safe braking torque and low wear.
To release the brake, the armature plate is released electromagnetically from the rotor. The rotor, shifted
axially and balanced by the spring force, can rotate freely.
3.4
Braking and release
During the braking procedure, the pressure springs use the armature plate to press the rotor (which can
be shifted axially on the hub) against the friction surface. The braking torque is transmitted between the
hub and the rotor via gear teeth.
When the brakes are applied, an air gap (s
L
) is present between the stator and the armature plate. To re-
lease the brake, the coil of the stator is energized with the DC voltage provided. The resulting magnetic
flux works against the spring force to draw the armature plate to the stator. This releases the rotor from the
spring force and allows it to rotate freely.
3.5
Project planning notes
¾
When designing a brake for specific applications, torque tolerances, the limiting speeds of the rotors,
the thermal resistance of the brake and the effects of environmental influences must all be taken into
account.
¾
The brakes are dimensioned in such a way that the specified rated torques are reached safely after a
short run-in process.
¾
Since the material properties of the friction linings are subject to fluctuations and as a result of different
environmental conditions, deviations from the specified braking torque are possible. This has to be
taken into account by appropriate dimensioning of the tolerances. Increased breakaway torque can oc-
cur in particular as an result of long standstill periods in humid environments with variing temperatures.
¾
If the brake is used as a pure holding brake without dynamic load, the friction lining must be reacti-
vated regularly.
