Microcontroller Control of Series Excitation Motor

The paper describes results of the studies of non-linear effect inherent to series excitation motors on energy efficiency. The paper proposes dynamic correction of a series excitation motor drive by using current dynamic parameters as a microcontroller feedback signal, and describes the technique of feedback signal modulating by means of self-current induction. Implementing the non-linear adjusting signal will make it possible to stabilize the drive cutoff frequency and make the system dynamics independent of the motor shaft speed. The adjusted system allows applying optimization techniques, both well-known and based on power efficiency and response speed criteria. The paper describes the microprocessor-based speed adjustment process. The adjustment system is based on the relations between the self-induction current fall rate and motor speed deduced in the paper.