Siemens SINAMICS SM150 - Design of the Motor Module; Figure 3-2 Basic Line Module with Diodes in 12-Pulse Configuration

Motor Module and Braking Module units can be connected to the Basic Line Module via the DC
bus.
Figure 3-2 Basic Line Module with diodes in 12-pulse configuration
A rectifier module consists of two B6 diode bridges connected in parallel. 12 disk-type thyristors
installed in the module are arranged in a clamped stack. Each diode is equipped with an RC
circuit.
3.3.3 Design of the Motor Module
The Motor Module comprises three identical phase modules.
On each phase module, four IGCT power semiconductors are located between water-cooled
heat sinks to ensure adequate cooling on both sides of the components. In addition, four
freewheeling diodes, two neutral-point diodes and two clamp circuits are installed in each
phase module. The clamp circuits comprise the following components:
● Switch-on relief choke
● Snubber capacitor
● Snubber diode
● Snubber resistor
The switch-on relief chokes are located on the side of the phase module. The snubber
capacitors and resistors are located in the lower area of the phase module.
Description
3.3 Design
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE 31