Three-phase asynchronous motors with slip ring rotor
Slip ring motors are a certain type of asynchronous machines. The difference
to short circuit rotors is the replacement of a cage with a three-phase
rotor winding which is conducted outward via slip rings. There are slip ring
systems with permanently seated brushes or with brush-lifting device (manual
or motorized) available.
Slip ring motors have been used as drives for many decades where high
starting torques with concurrently low starting current and soft starting
are required (f. ex. crane drives, belt drives). Therefore, the use of
relatively simple technical means makes it possible to forgo complex
frequency inverter systems as long as permanent speed control is not
necessary.
AEM develops and manufactures asynchronous machines with slip ring rotors in
three types with differences mainly in the type of cooling and degree of
protection. Our range of production includes surface-cooled (R-series),
force-ventilated (A-series) and tube-cooled (U-series) types. The slip ring
motors may be implemented as low voltage machines (up to 1000 V) with an
output of 160 kW up to 1900 kW or as medium voltage machines (up to 6900 V)
with an output ranging from 110 kW to 1750 kW. At AEM, each machine may be
adjusted constructionally and electrically according to customer
specifications. Thus, it is possible to flexibly and cost-efficiently
modernize older facilities or realize new ones.
