Current Control Scheme for Solid State DC Motor Drives

Solid state dc motor drives are becoming increasingly popular. The inherent disadvantages of such drives are studied by considering a separately excited dc motor fed from a single-phase thyristor converter. The discontinuous and highly rippled armature current in solid state dc drives affect the commutating capability of the dc motor and its static and dynamic performances. A novel current control scheme is outlined which can restrict the amplitude of the current close to its average value and make current continuous over a wide range of operation. This converter-motor system with current-control-scheme is simulated on an analog as well as on a digital computer. The system is found to be potentially capable of providing various useful torque-speed characteristics without any change in the field circuit. Experimental results demonstrate the feasibility of the system.

[1]  R. M. Dunaiski The Effect of Rectifier Power Supply on Large D-C Motors , 1960, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[2]  K. G. Black The Effect of Rectifier Discontinuous Current on Motor Performance , 1964, IEEE Transactions on Applications and Industry.

[3]  N. Kaufman An Application Guide for the Use of D-C Motors on Rectified Power , 1964 .

[4]  Charles E. Robinson Redesign of DC Motors for Applications with Thyristor Power Supplies , 1968 .