Technical Implementation of the High-Speed Response Servo Drive at the Programmable Logic Device

Programmable logic devices are used in modern electric drives for the implementation of their individual elements. This allows you to save the computing power of microcontrollers, on which electric drives are made. The purpose of the article is to create a variant of the technical implementation of the high-speed response AC servo drive on the programmable logic. To achieve this goal, a block diagram of the servo drive and transfer functions of all its elements are considered. It is shown that with a certain method of controller's synthesis, such block diagram of electric drive requires a minimum of calculations. A function diagram of the integral controller for the technical implementation on the programmable logic device is developed. The principle of its operation and limiting of the output signal, which ensures the stability of the servo drive in the whole range of movements and speeds, are considered. A function diagram of the set of proportional and proportional-differential controllers and a differentiating element in the speed feedback circuit has also been developed. The sequence of operation of all its elements, the principle of synchronization of the device and the limitations of the output signal of the proportional-differential controller, which is fed to a digital modulator that controls the transistors of the power converter, are considered. It is shown that the use of modulators that form trapezoidal phase voltage at the stator windings of AC motors does not require the computational power and also allows them to be implemented on programmable logic. A computer simulation of the proposed digital AC servo drive has been carried out and its high-speed response at the control actions working off has been shown.