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Subject - Electric motor
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bwh602
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I have a 30hp motor with pump for a ropu system, the generator that it is connected to it directs all of its power to the pump for the in-line rush. I am currently in Iraq working, what can I do that will help lessen the rush for the motor. It has to be basically primitive getting parts and materials is almost nothing. I do not have much experiance with motors anything to help would be greatly apprciated.
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Kraze
| When any motor is first started there is always a high in rush curent.This curent is called locked rotor curent (LRC) the only way to realy reduce it is to use a low voltage starter or a resistance starter that is if there is already some type of controller. Give me some more info on the machine 1.Is the motor AC or DC? 2.If AC what phase type i.e single or 3-phase 3.And is there a control station or panal there were you could wire up a motor-control device like a starter or do you just plug it in and push a button.
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JimmyDee
| Being a 30 HP motor, it is more than likely a AC 3 phase. Don't know of a single phase motor that large. DC is too much money and maint is high so they more than likely didn't give you a DC. Can't draw up the circuitry for it but with an additional starter or 2, you may be able to do the convert from Wye to delta trick. It effectively will do the same as adding resisters for reduced voltage if the motor is wired to be able to do this. I'll see if I can find some drawings on this. Europe does this all the time. Jim
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Ed MacLaren
| Here is a basic schematic for a typical wye-delta starter. Only the power circuit is shown. The control circuit varies somewhat from one manufacturer to another, and is not included.
Many other types of reduced-voltage starters are available, including the electronic soft starters.
Ed
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