[modeleng] Re: Where are you all?

Hi Julian

Thanks for your sage advice - my knowledge of electricity and electronics is 
abysmal!

If you find the references in ME I should be glad to have them.

Thank you again

Cheers!

Hubert


----- Original Message ----- 
From: <julianharrison7@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, September 17, 2008 9:26 PM
Subject: [modeleng] Re: Where are you all?


> Hi Hubert,
>
> I am just building a heavy duty version of a train controller to control 
> the
> speed of a fifteen amp dc motor. If you vary the voltage to the power 
> supply
> you slow the motor but you also loose most of the torque. For the same
> reasons if you vary the output voltage to slow the motor from 12v to 6v 
> for
> instance you again loose most of the torque so the motor can stall very
> easily.
>
> I am building a small electronic controller using a couple of 555 chips 
> and
> large mosfet transistor to pulse the motor. The length and frquency of the
> 12v pulses varies the speed without loosing any torque. There were some
> simple plans for one in ME I think last year.
>
> Perhaps the better choice to better control your leadscrew would be a
> stepper motor and controller. Drive directly or gear 2:1 and you shoiuld
> see300-600rpm which is proibably far more than you need for the leadscrew.
> The torque is better on steppers when they are run slower than full speed.
> ArcEuro sell a controller for £28. It can be driven by a simple 555 
> control
> circuit. Again plans are in ME from within the last 18 month. By 
> coincinence
> I am also building one of these to drive the table on a seig X3 and one to
> drive the leadscrew on my Seig lathe. If I get a chance to get into the
> workshop tomorrow I can find the issue numbers for you if you want or if 
> you
> can wait til I have built them can send u photos and diagrams.
>
>
> Regards
>
> 

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