HEK MSHF, User Manual

Page: 74 / 84

MAINTENANCE
9-4 MSHF • 7295-026A
9.4.1 Operation
The brake mechanism has a metal rotor
(3) with friction material on both sides.
Four pressure springs (5) in the stator
exert an axial force on an anchor plate (2).
This anchor plate is pressed by the spring
force against rotor. The rotor is mounted on
the motor shaft in such a way that it can
slide in an axial direction along the shaft.
Because the anchor plate presses against
the rotor, the rotor is pressed against the
friction plate (6). The contact between the
friction material on either side of the rotor,
the anchor plate and the friction plate
results in the required braking effect.
The stator has a built-in braking coil (1)
which produces a strong magnetic field
when a DC current is applied to it.
When the brake is to be released, a
current is made to flow through the braking
coil. The resulting magnetic field "pulls" the
anchor disc toward the stator, thus
releasing the brake.
It is also possible to release the brake
manually. If the manual release lever is
pressed in the direction indicated by the
arrow on the cover, the anchor plate is
moved against the spring pressure with the
aid of two ball bolts, so that it is pressed
towards the stator, releasing the brake.
Fig.9-2 Motorbrake