[TonyWalsham]

There will be a fair amount of energy wasted in the form of heat lowering the voltage down to 12 volts from 19.2. Especially if there is a also a reasonable load on the regulated voltage.

It would be much wiser to use 12 volt batteries.

 

[TonyWalsham]

Hi Ken.
As long as the batteries have the same chemistry, are the same capacity and size then simply add 2 more cells in series to get to 12 volts (nominal).
Del is correct. We need a bit more information before we can give you proper advice.

 

[TonyWalsham]

Hi Ken.

I think you should check the compatibility of the AirWire decoder with Faulhaber Motors.

Faulhaber have stated that it is safe to use a pwm output with their (so called) coreless motors when the frequency is above 5 Hz.

Below that coreless Faulhaber motors will overheat and may suffer winding damage.

 

[TonyWalsham]

OK. Coreless motors are also known as brushless motors. Check out what Faulhaber say about pwm frequency.

 

[TonyWalsham]

Posted By Kenneth Milner on 08/25/2008 9:00 PM
Tony - I've often wondered if the "brushless" motors and "coreless" motors were one in the same. Thanks for that bit of informaiton.
The Faulhaber motor I have is listed in the micromotor section and not the coreless section. Not sure if that makes a difference or not where the pwm frequency is concerned.
Ken



I can't guarantee coreless and brushless are the same. But I understand they are until I am told differently.
Posted By Kenneth Milner on 08/25/2008 9:00 PM
I think I mentioned that the stock Pittman motor hummed terrible when connected to the battery power. Al at CVP said it was the pwm frequency. The Faulhaber does not hum at all.
Ken




That is because the Faulhaber doesn't have an armature that can vibrate with the pwm frequency.

So if you're happy, I am happey.