Re: Motor speed control needed

To: tesla-at-pupman-dot-com
Subject: Re: Motor speed control needed
From: "Bill Noble" <william_b_noble-at-email.msn-dot-com> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Thu, 17 Sep 1998 04:50:30 -0600
Approved: terryf-at-verinet-dot-com

a speed control for a variable speed electric drill will work - here you can
get a used 1/4 inch electric drill really cheap - or you can use a lamp
dimmer if you provide some protection for the triac, or you can just put a
variac in series with it
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Monday, September 14, 1998 6:05 PM
Subject: Motor speed control needed


>Original Poster: Marco Denicolai <marco-at-vistacom.fi>
>
>I have a 220V 500W angle grinder that runs at 11000 RPM. I want to build
>a speed control for it. Somewhere I heard I need to vary the voltage of the
>fixed winding and keep using full voltage for the rotating ones.
>
>Has anybody of you got more precise instructions or even a schematic
diagram?
>
>Why I didn't buy an angle grinder with speed control? Because it would have
>costed over $100. This rubbish I have got (new) costed $20 and I think
should
>last enough if you think of its use as a RSG.
>
>
>
>________________________________________________________________________
>
> Marco Denicolai                   Vista Communication Instruments, Inc.
> Hardware Development Manager      www.vistacom.fi
>
> marco-at-vistacom.fi                 Kaisaniemenkatu 13 A
> fax:    +358-9-622-5610           SF-00100 HELSINKI
> phone:  +358-9-622-623-15         Finland
>
>   Remember, Murphy was an optimist! I am not...
>________________________________________________________________________
>
>
>
>