Motors
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
520/528
11.3 SIMOTICS TN series N-compact 1LL8 open-circuit self-cooled asynchronous motors
The SIMOTICS TN series N-compact 1LL8 trans-standard asynchronous motors in the output power range from
180 kW to 1250 kW are self-cooled, open-circuit motors in degree of protection IP23. Designed with an open inner
cooling circuit, the interior of these motors is directly cooled by ambient air. This cooling system is extremely efficient
and also increases the power density of the motors as compared to motors in the 1LA8 series. As a result of the
shaft-mounted fan, the cooling depends on the motor speed, a characteristic these motors share with 1LA8 motors.
Cooling system of a 1LL8 open-circuit self-cooled motor
11.4 Converter-optimized SIMOTICS FD asynchronous motors
The converter-optimized SIMOTICS FD asynchronous motors are available in an extremely wide range of electrical
and mechanical designs. As a result, they can be perfectly adapted to meet the requirements of virtually any variable-
speed application in the high power output range from 200 kW to 1600 kW. For further information, please refer to
Catalog D81.8 - SIMOTICS FD Flexible Duty Motors.
The SIMOTICS FD motor series is characterized by the following features:
· System-optimized for converter operation on SINAMICS G and S low-voltage converters
· Low noise emissions in operation thanks to the non-ribbed enclosure and the optimized pulse patterns of the
SINAMICS converters
· Various cooling methods: Air cooling (open and closed versions) and water cooling
· Flexible mounting position for terminal box, separately driven fan or separately mounted air-to-water heat
exchanger can be installed if required
· Rugged cast iron enclosure
· Wide range of outputs from 200 kW to 1600 kW (200 kW to 560 kW in shaft height 315)
· High power density
· High energy efficiency
The overview below illustrates the possible cooling methods:
1LM1 self-ventilated motors – enclosed version 1LQ1 forced-air cooled motors – enclosed version
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