Comparison of FPGA-based Direct Torque Controllers for Permanent Magnet Synchronous Motors

This paper reports two types of direct torque controllers for permanent magnet synchronous motors (PMSMs) in which the hardware configuration differs. These controllers used a single-chip FPGA (Field Programmable Gate Array). One of the controllers was constructed by programming the soft-CPU and the hardware logics written in VHDL (Very high speed ic Hardware Description Language), another was constructed only by hardware. The characteristics of these two controllers were compared in this paper. As the result, the controller constructed only by the hardware was able to shorten the control period, and it was able to suppress the torque ripple low.