An Experimental Investigation of Fuzzy Logic Speed Control in Permanent Magnet Synchronous Motor Drives

Abstract

One possible application of artificial intelligence in motion control is the use of a fuzzy logic (FL) speed controller. Regardless of all the work, it appears that a detailed investigation of the drive behaviour under FL speed control, using an experimental rig, is still missing. This paper provides an in-depth report on operation of a vector controlled permanent magnet synchronous motor subjected to FL speed control. The transients studied include speed response to large step speed command from standstill with nominal inertia and with an increased inertia, response to small step speed reference change with nominal inertia and with an increased inertia, and response to step load torque application. The transient behaviour is examined for various initial speed settings, so that an insight into the impact of the operating point on the controller behaviour is enabled. It is shown that the reference speed at which certain transient is initiated may strongly influence the speed response obtainable with constant parameter FL speed controller.