Implementing field oriented control of a voltage fed current regulated induction motor on a single transputer

Field oriented control (FOC) ensures high performance induction machine control. In particular, the indirect method of FOC is the most practical scheme since it does not require the measurement of magnetic fluxes within the machine, and consequently standard machines may be used. A typical FOC system contains high bandwidth current control loops which require fast and complex signal processing which is difficult to achieve using conventional analogue methods; however, high speed microprocessors offer an alternative. Nevertheless, the FOC algorithm is computationally intensive and consequently several microprocessor/digital controller solutions have been proposed in an effort to achieve the necessary processing requirements. This paper describes the implementation of an FOC digital controller for an induction machine utilising a single transputer and a high performance I/O system, with current loop sampling rates in the region of 10 kHz. Captured and simulated results are presented