A Performance Analysis of Microprocessor-Based Control Systems Applied to Adjustable Speed Motor Drives

Speed regulators for motor drives can be classified into four types according to the degree of accuracy and the response time required for a given application. Formulas are presented which can be used to determine the number of bits and the sampling time which are required of a microprocessor for a thyristor drive microprocessor-based speed regulating system. A systematic approach is also proposed which application engineers can use to evaluate and select the most adequate microprocessor from those commercially available for different types of digital speed regulators.