Advantages of AC drive
 | • More tons per $
• Higher speeds on diesel
• Higher power than DC
• Reduced downtime for routine maintenance
• Lower fuel and oil costs
• Less engine wear
• Less tire wear
• No brushes
• No motor maintenance
• Reduced brake wear | |
Better performance:
High stall torque, high constant HP (5,600), high speed (40 MPH)
Full constant HP available on trolley
4,500 KW electrical retarding capability - down to zero speed
System efficiency 2-3% higher than DC, more if averaged over cycle
Maximum HP engine control
Less maintenance:
AC induction motors are essentially maintenance free
Less brake, engine, and tire maintenance
Lower operating costs:
Lower diesel and oil consumption (estimate 6%)
No costs for brushes, commutator overhaul
Less for brake pads, engine overhauls, tires
Better electrical retarding:
Increased retarding power at all speeds (4,500 KW)t
Full retarding down to zero speed
Decreased demand on service brakes significantly reduces service break wear
Instantaneous, stepless response to retard pedal - GTO choppers replace contractors
During retard an electric blower is used for cooling - the engine can idle, saves fuels, and requires less maintenance
08/15/2006 | Author: Caroll Ford