RE: [CAD_CAM_EDM_DRO] U.S. 220 vs Euro 220

Peter:

It's more of a question of magnetic materials and hysteresis than inertia.
If a motor is designed for 60 hz operation, 50 hz operation can push the
magnetic materials into saturation. When this happens, the current through
the motor will go up, which will cause the motor to run hot and possibly
burn up. The same argument holds for transformers. Of course, the inclusion
of more metal in the 50 hz version of the motor will provide more inertia.
The other thing, with induction motors, is that motor speed depends on the
frequency of the power line. At 50 hz, a 60 hz motor will run at 5/6 its
normal speed.

-- Carol & Jerry Jankura
Strongsville, Ohio
So many toys, so little time



-----Original Message-----
From: Sven Peter, TAD S.A. [mailto:peteryco@...]
Sent: Thursday, May 17, 2001 5:13 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] U.S. 220 vs Euro 220


These two currents are definitely very different.
In America we have 240 Volts and 60 Hertz frequency
in Europe there is 220V and 50 Hertz.
The 50 Hz motors have much more inertia than the 60 Hz ones.
At least this is the case with threefase and normal singlefase motors.
How it is with DC and step motors I have no clue.

The result is you can easily take a machine from Europe to America.
Only the motors rise 20% in speed and loose 20% in torque.
For contactors you frequently have to step up the voltage
from 220V 20% up to 264 Volt. Otherwise the shatter.
But if you take from America a machine to Europe you will burn it in a
very short time.
because the motors low inertia. In other words the gap between the sinus
curve of voltage
in 50 Hz is too long and the motor for 60 Hz does not come over this
dead point.
If you want to take it with you you probably need a inverter to produce
your own 60 Hz
current.
Hope this is a hint and saves you a loss.
Good Luck
Sven Peter

blueveil@... wrote:

> Does anyone know if U.S. 220 is the same as European 220?
> Could I take a 220 single phase cnc machine to Europe and use
> it without any adapters?
> Any knowledge on this subject would be greatly appreciated.
>
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[Non-text portions of this message have been removed]


Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
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