The method of compensating voltage loss in the electrical network providing high power load are considered. Compensation is achieved by maintaining a capacitive (or inductive) current in the supply network using the high speed compensating device. The required value of current is determined by the compensator by calculations based on measurements of the active and reactive load current and load voltage in the node. Active and inductive impedance supply mains assumed to be known or identified in the process. The equations for calculating currents in the power supply system for a variety of modes are proposed.

An oscillatory method for identifying the characteristics of friction pairs of drive systems is considered. It is based on the use of mechatronic systems with a controlled "electric spring" and allows us to investigate dissipative characteristics in the regime of forced steady oscillations in the operating frequency range, with low laboriousness and high accuracy. The mechatronic oscillatory system is realized on the basis of a synchronous electric machine with permanent magnets on the rotor and a control system for the oscillation regime. The peculiarity of the method and the technical means realized on its basis is that the determination of the moment of frictional forces occurs not in the static state of the system, but under conditions close to the operational ones, i.e. with continuous motion by changing the direction of motion.

An energy-efficient and simple method of testing electric motors in a dynamic mode is considered. When testing an electrical machine, the rotor is driven into a reciprocating rotary motion. The source of power of the power converter, which controls the electric machine, is a supercapacitor. When the electric machine is accelerated, electric energy is consumed from the supercapacitor, when the machine brakes the kinetic energy of the moving masses is converted into electrical energy, which accumulates in the supercapacitor. The energy loss during the operation of the electromechanical system in the dynamic mode is compensated by recharging the supercapacitor using a controlled rectifier connected to the power supply network.

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The main directions of increasing the efficiency of using energy resources in mechatronic systems of mining excavators are considered. The main factors affecting the energy efficiency of excavators in quarries are the characteristics of the rock, the quality of the explosive preparation, the organization of the mining and transport complex, the characteristics and condition of the equipment, the geological conditions, the qualifications of the driver, etc. Improving circuit solutions and components allows to change ideological principles of the construction of mechatronic systems and provides the possibility of a significant increase in energy characteristics. The highest energy efficiency is achieved when using AC drives with asynchronous motors for excavators. The current issues of improving the power supply system and reducing the loss of electrical energy in the supply networks are considered.