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The desired speed of DC motors in most cases is a function of the intending usage, hence, the speed is continually regulated/controlled to suit different usage. Three basic methods are employed in the speed control; the quantitative comparison of these methods was investigated in this paper. For shunt and series motors delivering 11.07Hp and 13.94Hp respectively (at rated speed), the efficiencies were 84.43% and 90.22% with running cost of ₦246.00 and ₦276.00 respectively. Increasing the shuntdoi:10.24018/ejece.2018.2.5.30 fatcat:hhy7njku3jck5on6ztak2ntfa4