|
The voltage a motor requires to run won't vary too much, ideally not at all. The current draw varies with the load placed on the motor. Your batteries should be prepared to deliver over the current listed for the motor, so you can overdrive it for short periods of time. To simplify, the batteries will supply (ideally) a constant voltage (that will see drops during high load, or in other words current) and the current will vary with the power demand placed on the motor.
You are correct in your observation about PWM. I'm sorry for referencing the article before observing how overly complicated. to get 25% of the power out of your motor, you essentially close the circuit 25% of the time. This is by far the most efficient way to simulate lower voltages.
|