INTORQ BFK470 Series, Перевод оригинальной инструкции по эксплуатации

Страница: 13 / 52

Technical specifications
INTORQ | BA 14.0199 | 08/2016 13
The spring-applied brakes BFK470 are electrically releasable single-disc brakes with two friction surfaces.
When de-energized, both of the rotor’s friction surfaces are tightened by the force of the compression springs
between the armature plate and the flange. The braking torque is applied over the friction radius of the rotor;
it is transferred to the shaft via a hub that has axial gear teeth. When the brakes are applied, an air gap "s
L
"
is present between the stator and the armature plate. To release the brake, the stator´s coil is energized with
DC voltage. The resulting magnetic flux works against the spring force to draw the armature plate to the sta-
tor. This releases the rotor from the spring force and allows it to rotate freely.
3.1.2 Brakes
During the braking procedure, the pressure springs (1.2) use the armature plate (2) to press the rotor (3)
(which can be shifted axially on the hub (4)) against the friction surface. The asbestos-free friction linings
ensure high braking torque and low wear. The braking torque is transmitted between the hub (4) and the rotor
(3) via gear teeth.
3.1.3 Brake release
When the brakes are applied, an air gap "s
L
" is present between the stator (1.1) and the armature plate (2).
To release the brake, the coil of the stator (1.1) is energized with the DC voltage provided. The resulting mag-
netic flux works against the spring force to draw the armature plate (2) to the stator (1.1). This releases the
rotor (3) from the spring force and allows it to rotate freely
3.1.4 Project planning notes
❚ The brakes are dimensioned in such a way that the given rated torques are reached safely after a short
run-in process.
❚ However, as the organic friction linings used do not all have identical properties and because environ-
mental conditions can vary, deviations from the specified braking torques are possible. These must be
taken into account in the form of appropriate dimensioning tolerances. Increased breakaway torque is
common in particular after long downtimes in humid environments where temperatures vary.
❚ If the brake is used as a pure holding brake without dynamic load, the friction lining must be reactivated
regularly.
NOTICE
Due to the structural design of the stator, the air gap cannot be installed downstream. If the
wear limit is reached, the rotor must be replaced.