Spring Applied Brake
Friction material is bonded to the
rotor; the rotor is splined to the hub which is keyed
to the shaft. When no power is present, the
rotor, hub and shaft are clamped between the mounting
flange and the armature. During dynamic stops,
heat is generated between the friction lining and
mounting flange on one side of the rotor, and between
the friction lining and armature on the other side of
the rotor. The mounting flange and the armature
are both effective heat sinks that can dissipate
relatively large amounts of energy.
When DC power is applied to the coil, magnetic force
pulls the armature into the magnet and compresses the
springs. This releases the rotor, hub, and
shaft, which are then free to rotate.
The torque of the brake, and therefore the stopping
time of the machine on which the brake is applied, can
be adjusted by turning the torque adjustment
ring. Turning the ring clockwise increases the
spring force which increases the torque. Turning
the ring counterclockwise decreases the spring force
which decreases the torque.