Dual Voltage Motors Needed?
Dual Voltage Motors Needed?
(OP)
Strictly to test our control logic and our panel builds, we'd like to briefly run at no load several Baldor motors (7.5-20 hp) which are spec'd to be 380V/50 Hz. Our power supply is 480/60.
Given that there's no load and that we'd only be doing it for 60-90 seconds, is there any possibility of damaging the motors?
The vendor who quoted the system came back after we cut a PO for a duplicate system of one previously built and now says that they didn't quote dual-voltage motors on the new system and that if we want them then they have to increase the price. Of course, I don't want to pay any more than I need to.
Given that there's no load and that we'd only be doing it for 60-90 seconds, is there any possibility of damaging the motors?
The vendor who quoted the system came back after we cut a PO for a duplicate system of one previously built and now says that they didn't quote dual-voltage motors on the new system and that if we want them then they have to increase the price. Of course, I don't want to pay any more than I need to.
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RE: Dual Voltage Motors Needed?
Jeff
www.motors-direct.co.uk
RE: Dual Voltage Motors Needed?
An induction motor will have an equivalent magnetic load if the ratio Volt/Hertz is keep constant.
This motors are rated 380 Volts, 50 HZ so RatioV/HZ=380/50=7.6
The equivalent voltage at 60 HZ is; 7.6x60 = 456 Volts.
If your test is at 480 Volts the percent of overvoltage applied is; 480/456x100 =105.3%
Almost any standard for motor manufacture allows 5% overvoltage, NEMA allows up to 10% overvoltage.
RE: Dual Voltage Motors Needed?
Not so sure that I agree with that....would be very interested to know the results of your testing!!
Jeff
www.motors-direct.co.uk
RE: Dual Voltage Motors Needed?
"Venditori de oleum-vipera non vigere excordis populi"
RE: Dual Voltage Motors Needed?
RE: Dual Voltage Motors Needed?
This outfit is B$ting you about a higher price.
Mike Cole, mc5w@eathlink.net