Motors; Simotics Sd & Simotics Tn Series N-Compact 1La8 Self-Cooled Asynchronous Motors; Simotics Tn Series N-Compact 1Pq8 Forced-Cooled Asynchronous Motors - Siemens SINAMICS G130 Engineering Manual

11 Motors

We generally recommend use of the provenly reliable Siemens SIMOTICS SD and SIMOTICS TN series N-compact
asynchronous motors for standard applications. The new SIMOTICS FD asynchronous motors that are specially
designed for converter-fed operation have also been available since 2013. For more detailed information about these
motor series, please refer to Catalogs D81.1 - SIMOTICS Low-Voltage Motors and D81.8 - SIMOTICS FD Flexible
Duty Motors.
11.1 SIMOTICS SD & SIMOTICS TN series N-compact 1LA8 self-cooled asynchronous motors
The standard asynchronous SIMOTICS SD motors in the power range from 0.75 kW to 315 kW and the SIMOTICS
TN series N-compact 1LA8 trans-standard asynchronous motors in the power range from 145 kW to 1000 kW are
self-ventilated, fin-cooled motors with degree of protection IP55. Their fans are directly mounted on the shaft which
means that the fan cooling action is dependent on motor speed. For this reason, these motors cannot produce their
full rated torque in continuous operation over the entire speed range and the permissible continuous torque must be
reduced as a function of decreasing speed to allow for the reduced cooling effect of the fans. SIMOTICS TN series N-
compact 1LA8 motors have an internal cooling circuit in addition to the external cooling circuit, with both the internal
fan and external fan directly mounted on the shaft.
Internal and external cooling circuits on a 1LA8 self-cooled motor
Self-ventilated, fin-cooled SIMOTICS TN series H-compact 1LA4 motors in degree of protection IP55 are also
available at the higher output power range from 650 kW to 2450 kW (catalog D84.1).
11.2

SIMOTICS TN series N-compact 1PQ8 forced-cooled asynchronous motors

The SIMOTICS TN series N-compact 1PQ8 forced-ventilated, fin-cooled trans-standard asynchronous motors in the
output power range from 145 kW to 1000 kW are suitable for drives with high torque requirements at low speeds or in
a wide speed range. These motors are available in degree of protection IP55 with a built-on external fan. Depending
on the speed range, they require no or only a relatively low reduction in the rated torque, even for continuous
operation.
Internal and external cooling circuits on a 1PQ8 forced-cooled motor
Forced-ventilated, fin-cooled SIMOTICS TN series H-compact 1PQ4 motors in degree of protection IP55 are also
available at the upper end of the output power range from 650 kW to 2450 kW (catalog D84.1).
Engineering Information
SINAMICS Engineering Manual – November 2015
Motors
519/528
Ó Siemens AG