Topic: Had a good nose around this on Saturday... (Read 2018 times)

Marks DTM Calib · « **Reply #30 on:** 06 April 2009, 16:24:38 »

Quote

Most Diesel locos ran two stages - you can sometimes feel it change.

Some could only go to full power on weakest field - notably Deltics.

Insufficient field weakening also can ruin a locos high speed performance

Understandable given that in order to increase the speed of a DC machine you need a weaker field.....down side is the armature current goes up and hence you will be limited by the winding resistance and power handling capability (plus the pwoer capability of the alternator)

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Author Topic: Had a good nose around this on Saturday... (Read 2018 times)

Marks DTM Calib

Re: Had a good nose around this on Saturday...