Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Condition of theory bases of the electric drive Popov A.N. The basic lacks of bases of the developed classical theory of the electric drive, which is limiting its application in electric-opened one-mass electromechanical systems without elastic parts, outside of problems circle, concerning the power of electric drive are listed. The transition to the new theoretical base for the solution of modern and perspective problems of electromechanics on the achievement of the best (optimal) usage of electric, mechanical and energy characteristics of electromechanical systems is proved.