For locomotives, which are driven by diesel or electricity, EMU
and DEMU vehicles with AC Traction Motors, new microprocessor based AC-AC
Traction System (MAS) offers the latest in technology combining IGBT based
Traction Converter with DSP and microprocessor based embedded controls.
Microprocessor based Locomotive Control system is used in conjunction with IGBT
based traction converter to implement this solution.
Every traction converter can be configured to have single or
multiple inverters. Each Inverter can be further configured to drive single
traction motor (independent axle control) or multiple traction motors (bogie
control). Existing product offering ranges from 650kW per Inverter for bogie
control to 550kW per Inverter for independent axle control. Anywhere between 2
to 6 such inverters are packaged into one traction converter depending on
application with total power rating in the range of 1.3MW to 3MW. Last solution
can be scaled or optimized for specific application requirement.
Typically heat pipe depended heat sinks are used with forced air
cooling to cool down the IGBT switching devices. Both on-board as well as under
frame options are available depending on space, weight constraints and cooling
air availability. The blowers for cooling air are controllable at different
speeds or can be turned off depending on heat sink temperatures, so as to
enhance the blower life.
