Control and diagnostics of an AC servo drive in selected operation modes

The paper presents the construction and general working principle of an AC servo drive. The component parts of the servo amplifier circuits are described and the mathematical dependences relevant for the operation of a synchronous motor with permanent magnets are given. Besides, control modes and selected parameters of the servo drive are characterized. A number of measuring experiments were carried out on the system during acceleration and deceleration in a prescribed speed range. The results of measurements are presented as curves of the command position, feedback position, rotational speed and phase current versus time.