Variable resistors boost DC motor efficiency
A
REO product story
Edited by the Engineeringtalk editorial team
Nov 10, 2006
Motorised, rotary, variable resistors enable DC-motor-driven pumps to operate more efficiently at Surrey Water's Woodmansterne Pumping Station.
Pumping water from bore holes and to reservoirs after purification at Surrey Water's Woodmansterne Pumping Station is carried out using DC-motor-driven pumps.
A switch to electronically controlled AC systems has been investigated but the cost of implementing this is considered prohibitive.
This is particularly true while the DC systems are performing the operations effectively.
Helping to achieve efficient pumping operations are a number of motorised, rotary, variable resistors supplied by REO UK.
These are used to control the field winding voltage of the DC motor to facilitate speed control.
There are also a number of cam-operated microswitches acting as feedback speed indicator triggers to permit automated/remote control.
The motorised resistors and cam-switch arrangement were specially designed to fit into the existing control cabinets without the need for modification to the electrical circuits Another feature of the REO variable resistors is a manual operation facility which employs a mechanical clutch and hand-wheel fitted to the main drive shaft.
This allows for the overriding of automated operations to achieve specific speed running conditions, when required.
The REO units are used to control Lawrence Scott DC motors driving Sulzer pumps.
Pump motors range in size from a 90/35bhp (67/26kW) unit to a 250bhp (186kW), at 440V DC and 169/66A and 459A, respectively.
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