Current loop control system based FPGA, and servo device

Abstract

The invention relates to the technical field of alternating current servo vector control, and discloses a current loop control system based on an FPGA, and a servo device. According to the system and the device, through adoption of current loop control based on an FPGA hardware logic parallel processing mode, a current given quantity and signals sent by a current sampling module are input into a current controller module for PID calculation and decoupling compensation processing, a voltage vector reference value under a rotating coordinate system is output; a voltage vector reference value under a static coordinate system is output according to a rotor angle value output by an encoder feedback module and the output voltage vector reference value under the rotating coordinate system; a space vector pulse width modulation module converts the voltage vector reference value under the static coordinate system into three-way effective duty cycles; a complementary output pulse width modulation module with dead zone insertion converts the three-way effective duty cycles into six-way pulse width modulation square signals after dead-time compensation. Through adoption of the system and the device, the current loop control time is reduced, and the current loop bandwidth is improved.

Description

technical field [0001] The invention relates to the technical field of AC servo vector control, in particular to an FPGA-based current loop control system and a servo device. Background technique [0002] With the rapid development of power electronics technology, microelectronics technology, and new motor control theory, AC servo drive technology has become one of the key technologies of modern electromechanical equipment. Servo control is usually a three-loop control system, which is the current loop, the speed loop, and the position loop from the inside to the outside. Among them, the current loop is the inner loop of the system, and the speed loop and position loop are the outer loops of the system. As a multi-loop control system, the performance of the outer loop depends on the performance of the inner loop. The current loop is the key to improve the control precision and response speed in the servo control system. In order to improve the dynamic and static performanc...

AI Technical Summary

Problems solved by technology

[0005] The current loop of the existing servo control system is limited by the running mode of code serial execution, which makes the execution time of the current loop algorithm longer, resulting in a longer delay between current sampling and PWM duty cycle update, thus The control accuracy of the entire servo control system is not high and the dynamic response is slow, and it may lead to system instability in severe cases

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