230 mtr using 110vac
230 mtr using 110vac
(OP)
I have tested several 208-230vac mtrs using 115vac and they spin. Is there any reason not to do this? I know the rpm is less. Might the mtrs expire pre-maturely, and if so by how much? Might they overheat?





RE: 230 mtr using 110vac
If the motor is very slow to accelerate, the start winding may overheat at even 50% voltage.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 230 mtr using 110vac
RE: 230 mtr using 110vac
Keith Cress
kcress - http://www.flaminsystems.com
RE: 230 mtr using 110vac
But voltage has a dramatic affect on torque and loss of torque MAY influence the speed indirectly. In fact the motor torque varies by the square of the applied voltage change from it's design, so by giving your motor 1/2 voltage the motor torque will be cut to .52or 25%.
Unloaded, a motor only needs a small fraction of it's rated torque output to spin the mass of its own rotor, so because the frequency is correct it may indeed spin at the correct speed. But motors are "dumb animals". As soon as you put any appreciable load on that motor it will be unable to keep it spinning, the motor will slow down, the slip will increase and it will pull so much current in an ATTEMPT to get to normal speed that it will burn itself up.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies