A motor/generator system that can be controlled internally based on external power-generating needs or in response to operating parameters. The system can be controlled manually by a user to select desired power-generating needs. The system can also be controlled by an algorithm taking into consideration parameters such as vehicle velocity and potential to predict speed, braking, acceleration or deceleration. In the motor/generator, stator plates can be moved by linear controllers in response to these external inputs to vary the amount of required power, creating an on-demand charging system that can efficiently transfer power and extend the life of the system.