Let's Make Robots!

Tuning your motors

On old trick to get more power out of your cheaper motors


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Here's an old trick, but it it's good.

if you have a setup with a (cheap) motor, and you'd like a little more juice out of it.. get some of them strong magnets, ofen refered to as "rare earth magnets, and place them on each side.. watch video :)

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I'll never get into measuring on it; Will no understand it. I just know one can tune the motor like that. Substantial.

Some techie, please take it from there for more techie-info :)

So I wonder.... would you get better, same, or worse results using 3 or 4 magnets in series instead of the 2.

 I would think 3 would increase it a bit but with 4 id be afraid it may start having opposite pulls. Then again the motor is being forced and not relying on some magnetic pendulum 


Another fun idea would be eliminating the motor and creating a magnetically propelled bot?! Fun challenge perhaps?


I'll post the challenge offering one lucky american  penny to the victor!



nice hack!!
where do you get rare earth magnets??

Isn´t this the same of applying extra voltage to the motor?
You can harvest them from any old hardrive. You wont get the cyllinder shape but you could always cut them. Look online theres plenty of youtube videos and instructables on how to do it.

Since we're all being scientific about things and all... Frits, could you measure the current drawn by the motors with and without the extra magnets?


Sure.. if you can tell me how to hook up my measure-thingey to do this.


If your meter only goes up to 200 mA, you probably should not be trying to measure motor current with it. There is a chance it will burn that function out of your "measury thingy". Cause motor current can quite easily be more than 200 mA


1. Better to attempt to measure the resistance across the motor terminals (kind of a hack, twitchy)or

2. Place a small(1 ohm or less) resistor in series with the motor, and measure the voltage drop across that. Safer

option 2 is best, most accurate, if you have a small resistor. 

My multimeter "only goes to 200mA" too, but that's just on the fused line. If I plug it in nonfused, I can go to about 10 amps. It appears frits also has his multimeter using the unfused line.

If you check the pic closely, there is no unfused option for Fristls' Wavetek 5XL meter. In checking the  5XL meter manual, there doesn't appear to be any connection for measuring greater then 200 mA, other than the voltage across a known resistance.

I do have a cheapy meter that will do 10 A unfused, and another more diverse meter that will do the same too.

Ah, my mistake. The red image appeared to be a warning for the no fuse line, as is the case on mine. I have a DT-830D cheapie, truly wonderful device. I can't imagine what I would do without this thing.