I am working on a project; driving a DC MOTOR using an NMOS MOSFET amplifier and Arduino PWM signal.
My problem is my transistor amplfiler is always on when I vary the PWM input value from 0 to 255. Also, the motor runs faster in smaller PWM value and runs faster in larger PWM value. But, my intention is to run the motor faster in larger PWM value..
The below is my current circuit diagram. My transistor is "RFP30N06LE" NMOS MOSFET, my motor is Buehler 4-wire Precision DC motor That can run from 6V to 24V.
Could someone educate me on why my transistor is not getting turned off, and the motor runs faster with smaller PWM value to the amplifier please ?!