Motor in series Question

[Edward531]

Hi guys,

I have a clod build going..I plan to use two 540 stock silver can motors in series. However when everything is connected, one motor seems to turn slower than the other.. I tried getting a diffrent silver can but still the same result.it slows down t o a halt while the other motor is still turning. What could cause this? Is there a regulator needed of some sort. I built LED foglights in series before and I noticed over time, one bulb eventually weras out more than the rest? Could this be related and be applicable even by analogy to my motor problem?

Thanks in advance

Edward

[Robb]

Wired in parallel is the most common, and advantageous, means of wiring two motors in a crawler. Is there a particular reason you are going with series?

[Grizzly4x4]

Originally Posted by Edward531

Hi guys,

I have a clod build going..I plan to use two 540 stock silver can motors in series. However when everything is connected, one motor seems to turn slower than the other.. I tried getting a diffrent silver can but still the same result.it slows down t o a halt while the other motor is still turning. What could cause this? Is there a regulator needed of some sort. I built LED foglights in series before and I noticed over time, one bulb eventually weras out more than the rest? Could this be related and be applicable even by analogy to my motor problem?

Thanks in advance

Edward

With the motors wired in series, when one motor sees an increase in load, the other motor will spin faster. If you stop one motor the other will spin very fast.

I believe the theory with series wiring is that if motor 1 sees an increase in load, the current flowing through it decreases and the voltage drop across the motor decreases.
Since the total voltage drop (motor 1 + motor 2) must remain constant, the voltage drop across motor 2 increases, as does the current flowing through it. This makes motor 2 spin faster.

I may be shaky on my theory but I do know for a fact that increasing the load on one motor increases the speed of the other motor. I've tried it and it does not work for crawling with a Clod type axle. If both motors were driving a common gear, it works fine.
Clods should always be wired in parallel for crawling.