09-09-2017, 01:49 PM
A radial function radial network control system (RBFN) based on a field programmable gate array (FPGA) is proposed to control the movement position of a linear induction motor (LIM). First, the indirect field-oriented mechanism for the control of MFR is adopted. Next, an equivalent control law is designed based on a sliding mode control, in which the uncertainties are grouped by a conservative constant. However, the accumulated uncertainty is unknown and difficult to obtain in advance in practical applications. Thus, a RBFN is derived to approximate the equivalent real-time control law, and a robust RBFN control system with online training capability is given. Then, an FPGA chip is adopted to implement the field-oriented indirect mechanism and control algorithms developed for possible low-cost, high-performance industrial applications. The effectiveness of the proposed control scheme is verified by some simulated and experimental results. With the rugged RBFN control system, the movement position of the LIM unit based on FPGA has the advantages of good transient control performance and robustness to the uncertainties in tracking periodic reference paths.