21
ENGLISH
2. Description of the
product
The D Series and H Series motors have a built-in
brake inside the enclosure. The motor and brake are
considered as a single piece of equipment and are
covered by a single certificate.
The brakes are designed to work dry.
When the motor is stopped, the brake provides the
braking torque indicated on the nameplate.
The brake is housed in a specific enclosure made up
of a brake holder shield
ct
, a brake cover enclosure
dt
and only for motors 180÷315 (by the brake enclo-
sure shield
ds
bolted together.
The brake holder shield shuts off the motor enclosure
and allows the shaft to pass through it
br
.
In the case of self-ventilated motors (H Series) the
shaft protrudes from the brake cover enclosure
through a flameproof joint. A fan is applied to the
protruding part of the shaft
cr
.
The brake enclosure and the fan are protected by the
fan cover
bq
.
The self-ventilated version is not available for size 63.
When the brake is powered, the electro-magnet
dp
attracts the mobile armature
dl
. As this moves the
springs are compressed releasing the brake disc
dm
,
so that the motor shaft, to which the brake disc is
coupled, is able to turn freely.
When the voltage to the brake is disconnected the
electro-magnet is deactivated and the springs push
the mobile armature against the brake disc.
The brake disc causes friction on the brake holder
shield and the mobile armature stops the shaft rotat-
ing.
2.1 General operation
Table 2A - Component classification
Note: spare parts indicated with numbers from 48 to 51 are not listed in the catalogue, but only in this publi-
cation.
Component
number
Description Shown in figure
16 Fan cover (cowl) 2A
17 Shaft 2A - 2B - 2C - 2D
27 Cooling fan 2A
29 Brake holder back shield 2A - 2B - 2D - 2E
31 Mobil armature 2A - 2B - 2D - 2E
32 Brake disc 2A - 2C - 2D - 2E
35 Electro-magnet 2A - 2B - 2C - 2D - 2E
36 Pinion (toothed hub) 2A - 2B - 2C - 2D - 2E
38 Brake shield 2B - 2E
39 Brake cover enclosure 2A - 2B - 2E
48 Fixing screws (studs) 2C - 2D - 2E
49 Screws (nuts) to adjust the braking torque 2C - 2D - 2E
50A-50B Screws (nuts) to adjust the air gap 2C - 2D - 2E
51 Springs 2C - 2D - 2E
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