Re: [CAD_CAM_EDM_DRO] Re: Servo motor maximum voltage rating

One of the probelms with limiting the current to the rated current is that
you cannot accelerate as quickly particularly under load. This can limit the
performance when machining contours. Depending upon a number of factors,
current limit is set to between twice and five times rated current. If there
is a crash then the motor will not burn out immediately but will be stalled
with the limited current flowing. It should last like this for probably up
to a minute which should give time for you to cut the drive. Alternatively
fit a motor thermal overload.

Regards Peter

----- Original Message -----
From: <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 26, 2001 5:16 PM
Subject: [CAD_CAM_EDM_DRO] Re: Servo motor maximum voltage rating


> Hi,
>
> There should be no problem doing that as long as two rules are
> observed:
>
> (1) The drive should limit the motor current to the rated stall
> current.
>
> (2) You should limit speed to the motor's rated no-load speed.
>
> Equally important is to observe the motor's maximum continuous torque
> (current) rating. This is much lower than the stall torque. Torque
> beyond that rating should be used for very short periods of time
> only, such as accelerating and decelerating.
>
> Don't think in terms of getting "better performance" from the motor
> by using a higher voltage. The above rules are meant to get rated
> performance from the motor at higher than rated supply voltages.
>
> Going past rated limits will rapidly shorten the motor's life.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., npalen@n... wrote:
> > Hello--I'm running some small pitman servo motors rated at 30 volts
> > on a 24 volt power supply. What happens if I switch to a 48 volt
> > supply to get better performance? Instant destruction?
> > Thanks.
> > Nelson
>
>
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