Lenze 13.7xx Motors-Geared motors - Manual (Page 19)

Technical data
Functional description
Motor series 13.5
LL (GN)
3
l
19 BA 13.0009 − EN 2.1
3.1.2 Motor series 13.5
LL (GN)
Fig. 2 Motor type 13.5 LL
DC shunt motors feature wound magnet coils for generating the magnetic flux in the
stator. In the laminated core the rotor has a winding which is guided to a collector. The
current entry is effected via carbon brushes to the collector. The winding through which
the current flows in the constant magnetic flux generates a torque proportional to the
motor current, which is transferred to the motor shaft. Shunt motors are characterised by
low speed variations when the load is varied. The DC shunt−wound motors are unaffected
by start−ups under load, short−time accidental blocking and countercurrent braking.
The motors of type 13.550 are fully compensated, i. e. they are equipped with a
compensation and interpole winding. This winding technology provides the motors with
very good running characteristics and long brush lives.
The motors are equipped with internal fans operating irrespectively of the direction of
rotation. In the case of speed−controlled motors it is to be observed that the cooling effect
clearly decreases at a speed of < 1000 min
−1 . If it is not possible to reduce the load, the
motor cooling has to be effected via a separate fan.
Reversal of rotation direction by inverting the connection polarity of either the armature
winding or the field winding.