I have a 24V, 1500rpm bldc motor.The power output will be around 400W. We are using it to electrically drive a tricycle. How can I calculate the gear ratio to decrease the rpm and increase the torque? The transmission system includes an intermediate shaft with 22 teeth sprocket and 44 teeth sprocket. Motor is connected to the 22 teeth sprocket and 44 teeth sprocket is connected to the 26in(dia) wheel with gear cassette. If the motor is used as generator, how can I know the voltage and current generated by it?