Lenze 13.7xx Motors-Geared motors - Manual (Page 20)

Technical data
Functional description
Motor series 13.12
L (PM)
3
l
20 BA 13.0009 − EN 2.1
3.1.3 Motor series 13.12
L (PM)
Fig. 3 Motor type 13.12 L
− smooth housing
− no fan, heat dissipation by convection
and radiation via the motor surface
Permanent magnet motors are DC motors. The magnetic flux is generated by
permanent magnets in the stator. The rotor in the laminated core has a winding that 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 permanent magnet flux
generates a torque proportional to the motor current, which is transferred to the motor
shaft. PM motors feature distinct shunt characteristics, i. e. only low speed variations in
the case of load variations. Reversal of rotation direction by inverting the connection
polarity; a change−over only is permissible in standstill.
(
Stop!
The maximum permissible current (I
max.
) may not (not even for a short time)
be exceeded! If required, the current has to be limited to permissible values!
Speed−independent heat dissipation is effected by convection and radiation via the
motor surface. The motors can be operated at very small speeds at rated torque without
additional cooling measures.