Abstract
A microcontroller unit with minimal hardware investment that has been designed for the digital control of a highly dynamic AC servodrive is described. The structure of the microcontroller, the Siemens SAB 80C166, and the concept of the external hardware are described. The principle of a three-phase full-bridge and the generation and measurement of three-phase pulse-width-modulation (PWM) signals utilizing the capture/compare unit are discussed. In addition, the structure used for the current and position measurements is described. The three state values (position, speed, and current) are the main components for the control of a servodrive. A cascaded feedback controller with an inner current loop control is realized with this microcontroller. >
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