First off let me say thank you for all the responses! I would have been back sooner, but I never recieved an email notification. I didn't think I had any responses.
They should share the load automatically if they are the same. However, if you have different resistances due to the stated variables, the same current will ensure they both do the same work. I'm assuming they are coupled and will run at the same rpm.
Mike.
Yes, they should run at the same RPM being as they will be rigidly couple together at the shafts.
You are overloading the motors if a slight imbalance damages one motor.
yes, but consider that you have 2 400A motors in parallel, and your controller is sets the current limit at 800A, a slight difference in brush resistance or brush timing could cause one of the 2 motors to draw a lot more than 50% of those 800A.
Assuming you connect them in series. Then you at least ensure that the current through both is equal.
When loaded, torq will be a function of input current.
However, a motor that is twice the size usually have better performance/loss caracteristic than two equal motors.
As far as I have seen, this is currently the best way to do it. people who are having success with dual motor setups are running in series, but it necessitates having double the voltage, and that means more batteries, more weight.
Consider post #3. Two "identical" motors might not operate identically, despite having the same current. They must operate independently of each other. You have two choices: either measure the torque of each motor and use the measurement to feedback to a controller to insure niether motor is excessively loaded, or use a mechanical coupling device that combines each motor's input in an independent way. Such a coupling device would be a mechaincal differential, for example.
that's an out of the box idea. I will need to improve my understanding of differentials and see if I can apply it.
Have never thaught of using a mechanical differential in the opposite way. That way, both motors should have the same torque all time.
Having that said, when speaking about mechanical differential I personally think that it might be a solution for large motors. For small motors in toy cars, I guess that such a mechanical coupling will eat a great part of the motors output effect because of poor effiency of small gears.
That is a ting OP haven't mentioned yet.
I stay my ground in this question. I cannot see why one motor should be damaged by the other. Well of course, the shaft shouldn't be rigid all the way.
This is not a toy, it is for a go cart. the motors I am considering are the **broken link removed**or **broken link removed**
I am brainstorming to build a controller with dual outputs for 2 motors for load sharing, which would solve a lot of problems in trying to parallel motors.