Methods and tools increasing energy efficiency of machines and technologies with asynchronous drives

The paper considers methods and structures of asynchronous drive providing increased energy efficiency of machines and mechanisms with electric drives. The authors performed analysis of the following methods and tools increasing energy efficiency of asynchronous drives: rational choice of electrical equipment of electric drives; loss reduction in electric drive motors; loss reduction in power lines; transition from non-controlled electric drive to controlled one. It is shown that assurance of high electromagnetic and energetic compatibility is primary for development of methods and tools increasing energy efficiency of machines and technologies with asynchronous drives. The first aspect involves minimization of high-order harmonics that exist in power network due to frequency converter. The second aspect involves ensured functioning of unity-power asynchronous drive. The authors describe example use of considered methods and tools at embodiment of multimotor controlled electric drive of the main machinery of the excavator.