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actualy people search for a controller based on the motor they have,,thats because they chose the motor according to how much torque,pwer,speed they seek....searching for a dc motor for your driver ,,well based on what? your controller has maximum ratings,,u want that? i dont think you would need a dc motor with 80 AMPS ,,,amps means torque ,, voltage means speedas long as i dunno whats it gonna push and how fast it should go then i cant suggest you one,,,i think you can only choose your motor just watch out it doesnt go above the maximum ratings u mentioned above

well, dc motors in general are coils inside magnetic fieldsthe voltage becomes across the coil , and the current runs through it,, now the next step and the butter of all that is the laplace equivalants about how the magnetic field affects a wire with electrones runnin through it(it pushes it in some direction)and because the wire here is a coil(rounded wire) it turnsthe oposite happens when a moving circuit is moving inside a magentic field , current happens to run in this circuitto calculate how many turns per minute (how fast) your dc motor runs under 50 volts you should get the constants of your dc motor's coil and solve the laplace force equationsgoogle laplace force or dc motor equations