VariableFrequencyDrive is reviewed in the article. Such drives have been successfully used in the in variable load mechanisms, which include fans, pumps and blowers last 10-15 years. The main parameters, characteristics, classical and modern methods of regulating pumping systems are considered. The power consumption of such mechanisms is proportional to the cube of the rotational speed, which is regulated by modern Variable Frequency Drives. They are used to control the speed and torque of the engine, which leads to a reduction of power consumption. This provides significant energy and resource savings. Nowadays the leading manufacturers of such drives offer already in addition to this advanced software that implements advanced algorithmic and technological solutions, provides optimum performance, enhanced security and easier installation and diagnostics. To increase the efficiency of the engine Mitsubishi Electric offers innovative algorithms  of OptimumExcitationControl. With such control, at different load moments, the motor operates with the maximum possible efficiency close to the optimum. This method provides significant energy savings when working with low loads, providing an additional saving of power consumption of at least 15%. In addition to significant energy savings, the efficiency of the engine with such control is approximately 30% higher than for the classic (V / F = const), and at the same time a large starting torque. This concept of construction and management of pumping systems, the introduction of energy saving technologies leads to increasing comfort, efficiency and decreasing lifecycle costs. The saving of heat and electricity energy and the ecological effect, connected with this, as well as raising the standard of living, are the first tasks that engineers are setting up today.