GGK wrote:Impunity wrote:GGK wrote:
As for mode of operation, the current is locomotive (where the engines pulls all the load from the front). What is proposed is different..... diesel-electric multiple unit (DEMU) where a diesel engine drives an electrical generator or an alternator which produces electrical energy. The generated current is then fed to electric traction motors on the wheels or bogies. this produces trains that gain speed faster and stops fasters
Where is this diesel engine located? Is it located at the front of the whole train or located within selected wagons/coaches?
I guess the engines are distributed
DMU engines are smaller and several are used on a train, depending on the configuration. The diesel engine is often mounted under the car floor and on its side because of the restricted space available. Vibration being transmitted into the passenger saloon has always been a problem but some of the newer designs are very good in this respect.
Diesel-electric locomotives come in three varieties, according to the period in which they were designed. These three are:
DC - DC (DC generator supplying DC traction motors);
AC - DC (AC alternator output rectified to supply DC motors) and
AC - DC - AC (AC alternator output rectified to DC and then inverted to 3-phase AC for the traction motors).
The DC - DC type has a generator supplying the DC traction motors through a resistance control system, the AC - DC type has an alternator producing AC current which is rectified to DC and then supplied to the DC traction motors and, finally, the most modern has the AC alternator output being rectified to DC and then converted to AC (3-phase) so that it can power the 3-phase AC traction motors. Although this last system might seem the most complex, the gains from using AC motors far outweigh the apparent complexity of the system. In reality, most of the equipment uses solid state power electronics with microprocessor-based controls.
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