Re: [CAD_CAM_EDM_DRO] Inverter Drives

In a message dated 5/11/2003 5:24:47 PM Eastern Standard Time,
timg@... writes:

> Unless your motor is rated for double the speed that it gets at 60 hz I
> would not even suggest going to 120 hz. So, I seriously doubt you need a
> drive that will let you go above that. An exploding armature is not a
> pretty sight.
>

Tim is correct, and also if the motor is NOT inverter rated you will have
problems with overheating at slower speeds causing premature failure of the
motor. It is usually safe to go up to 70 Hz on a 60 Hz rated motor but I
would not recommend going any higher and you wouldn't want to go much slower
than 1/4 the motors rated speed and then not for long periods of time, again
unless the motor is inverter rated. Those motors have special care taken and
use different "potting" and coating compounds and internal designs to take
the extra heat generated when the fan on the motor is not turning fast enough
to cool it as normal

Randy Abernathy
4626 Old Stilesboro Road
Acworth, GA 30101
Ph / Fax: 770-974-5295
E-mail: cnc002@...

Intallation, repair, service, upgrades of industrial CNC woodworking
machinery


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