Monday, April 21, 2014

Motor Driver Board

Because the E90 Razar Scooter can with a single direction motor controller, we are using MD07a motor drivers to interface with the motors. The driver circuit should below is connects to the 12V lead-acid battery and the outputs the two leads of the motor based on the two logical PWM and direction input. Since the mbed's logic 1 is 3.3V and the driver's minimum voltage from a logic 1 is 3.5V, we are using a comparator chip to boast the mbed's logic 1 output to 5V for both the PWM signal and the direction signal.

Here is a video of the motor driver board being used to interface with the rear wheel assembly of the E90 scooter and run the motor up to full speed.