Thesis-1978-Aksel.pdf (18.07 MB)
Download file

A delta–sigma-modulated speed control system for induction motors

Download (18.07 MB)
posted on 15.08.2018, 11:18 by Alpaslan Aksel
The electronic control techniques used in static frequency changers differ considerably, depending on the type of system considered and the particular specifications and requirements. Mark-space ratio control and pulse-width modulation are among techniques already well-established for use with induction motors to provide a variable-speed a.c. drive. The project is concerned with the applicability of delta-sigma modulation as the basis of a novel method of electronic speed control. The techniques involved are well-known in communication systems, where they are extensively used in the transmission of speech signals. With a sine wave at the input, a delta–sigma modulator produces an output quantised in both voltage and frequency, which enables power control to be achieved from a fixed d.c. supply using only a single power controller. [Continues.]



  • Mechanical, Electrical and Manufacturing Engineering


© Alpaslan Aksel

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at:

Publication date



A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.



Usage metrics