eng Science and Education Publishing American Journal of Electrical and Electronic Engineering 2328-7357 2016-05-05 4 2 62 68 10.12691/ajeee-4-2-3 AJEEE2016423 article G. C. Diyoke geraldiyoke@mouau.edu.ng 1 Okeke C. 1 Uchechi Aniagwu 1 Department of Electrical and Electronic Engineering, Michael Okpara University of Agriculture, Umudike Abia State, Nigeria Asynchronous motors are the most widely used electrical motors due to their reliability, low cost, ruggedness and robustness. However, asynchronous motors do not inherently have the capability of variable speed operation. Due to this reason, earlier dc motors were applied in most of the electrical drives. But the recent developments in speed control methods of the asynchronous motor have led to their large scale use in almost all electrical drives. In this paper, various methods of speed control of induction (asynchronous) motors such as variable rotor resistance, variable stator voltage, constant Volts/hertz control, frequency variation, pole changing, etc., were carried out and MATLAB software was used to develop the codes for the analysis of these methods. http://pubs.sciepub.com/ajeee/4/2/3/ajeee-4-2-3.pdf asynchronous motor speed control mode of operation