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From: firstname.lastname@example.org (N. Thornton)
Subject: Re: Jigsaw 50Hz on 60Hz
Date: 10 Sep 2002 06:03:53 -0700
References: <email@example.com> <3D777E36.31ABCC39@NoSpammingMer-a-tReally.com>
NNTP-Posting-Date: 10 Sep 2002 13:03:53 GMT
Reagan Thomas wrote in message news:<3D777E36.31ABCC39@NoSpammingMer-a-tReally.com>...
> Martin Griffith wrote:
> > > I have a jigsaw Metabo 220Vac/50Hz with a variator and I use it now on
> > >220Vac/60Hz the problem is speed oscillates ... do you have an idea why and
> > >what I can do to avoid this problem..
> None of the Metabo spec's I found make any reference to input frequency
> dependence (neither do they mention volts, hmmm).
> However, I see no technical reason for it to care whether it's
> operating on 50 or 60Hz. A normal AC induction motor would simply
> run faster at 60 than at 50 Hz. With the variable speed control,
> it should care less.
> My guess is that the speed would oscillate even if you were operating
> it on 220V, 50Hz... I think something is wrong with the speed control.
I would agree it has to be to do with the speed controller. Either
faulty, or else its speed control feedback loop is stable at the 50Hz
motor speed, but isn't when the motor tries to run 20% faster.
Or perhaps it cuts the motor power when it senses the motor is running
too fast? Who knows.
2 options spring to mind: one is to run without the speed controller,
which is OK with some setups (50/60Hz motors), and a total no-no with
some (high freq motors run off chopping supplies).
Another possibility is to adjust Vsupply with a small transformer to
get the motor speed back to what it was designed to be: this won't
work with induction motors, but with most other types it will.
I think the main Q here is what type of motor do you have? Is it
induction or not?
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