12 v dc dynamo

[Tufty]

Originally Posted by steamy1

LiveSteam and anyone else who is interested.

The voltage regulator would not be directly connected to the output it would be connected in series with and control the field coil only, that is how the original type regulators are connected, the full output of 20 - 40 Amps at 12 Volts would then be available .

So are you saying if you 'clamp' the field windings at 12v you will never get more that 12v output no matter what speed you run at?

[LiveSteam]

Originally Posted by Tufty

So are you saying if you 'clamp' the field windings at 12v you will never get more that 12v output no matter what speed you run at?

No, while Steamy1 is kind of correct with their comment connecting the electronic voltage reg to the field, this wont regulate the output, my assumption was for not using a battery, and thus connecting everything up in series and hoping for enough residual magnetisium to start the generation process.
If you are adding a battery then stick with the standard mechanical regulator.

[Gaudin98]

You wont find automatic voltage control on a full size engine, just a variable field resistance and a attentive engine driver.

[steamy1]

Originally Posted by Tufty

So are you saying if you 'clamp' the field windings at 12v you will never get more that 12v output no matter what speed you run at?

An electronic regulator and the original mechanical regulator will both hold a pre-set voltage provided that the input voltage is higher.

So.......................... you won't get the pre-set voltage if the speed is too low.

[Tufty]

Originally Posted by steamy1

An electronic regulator and the original mechanical regulator will both hold a pre-set voltage provided that the input voltage is higher.

So.......................... you won't get the pre-set voltage if the speed is too low.

That end of things I understand the regulator cannot 'create' voltage.. I was more confused about the other end of the 'graph'....

Once the Dynamo is generating over 12v are you saying if the field winding is then kept at 12v the generated voltage cannot rise above this no matter if the speed is increased?

[steamy1]

Originally Posted by Tufty

Once the Dynamo is generating over 12v are you saying if the field winding is then kept at 12v the generated voltage cannot rise above this no matter if the speed is increased?

Yes but the Regulator itself has an Input Voltage limit rating see "Absolute Maximum Ratings" on the PDF link below.

In theory the Regulator would fry if the maximum voltage was exceeded but would a miniature drive the dynamo fast enough? .


http://www.farnell.com/datasheets/19...508.1502905985

[Tufty]

Originally Posted by steamy1

Yes but the Regulator itself has an Input Voltage limit rating see "Absolute Maximum Ratings" on the PDF link below.

In theory the Regulator would fry if the maximum voltage was exceeded but would a miniature drive the dynamo fast enough? .


http://www.farnell.com/datasheets/19...508.1502905985

Hi,
I don't think your getting what I'm asking. I fully understand how voltage regulators work.


The thing I don't know about is the Dynamo itself.

Does holding the field windings at 12v hold the generated output at 12v and it makes no difference if the speed is then increased?

[steamy1]

Originally Posted by Tufty

Hi,
I don't think your getting what I'm asking. I fully understand how voltage regulators work.


The thing I don't know about is the Dynamo itself.

Does holding the field windings at 12v hold the generated output at 12v and it makes no difference if the speed is then increased?

I haven't made it clear that the electronic regulator would need "tweeking" and some more components to monitor the output and regulate the field accordingly.

[Gaudin98]

Looks like an awful lot of trouble to reinvent the wheel. Just a variable wire wound resistance is all that is needed in the field and keep your eye on what's going on.