Choosing the Right Resistor for a 6V DC Motor Running on a 9V Battery?

[wdlanghans]

Hi!

I have a small (about 1") electrical motor that I'm using for a diorama for model train set.
The motor is rated for 6 volts DC and I think it said 150mA but I don't remembered and now I can't find the packaging.

It's this one if that helps

http://http://www.radioshack.com/product/index.jsp?productId=2914699#tabsetBasic"

What I would like to do is run it off a 9 volt dc battery, and I would like for it to move a slow as possible. What kind of resistor do I need?

Thanks!

 

[Fischer777]

I would say that a small variable resistor (like the kind at radio shack) would work rather well, seeing as how you can adjust the resistance to suit your needs. Just remember that as you decrease the speed you also decrease the power, and as a result the resistance will need to be adjusted for when you add the weight of the train. In other words, if you get it to spin at the desired speed as is, the resistance will need to be lessened when you put it in the train.

 

[wdlanghans]

The motor isn't for a train, it's for part of the diorama; to make a radar dish rotate at a slow fixed speed if possible. I was hoping I could do it with a single resistor I just don't know how to figure out which one I need.

But, thanks for the reply :)

 

[Averagesupernova]

So are you thinking direct drive to this rotating dish from the motor? That will be a problem.