Description: The frequency converter is a device which is used to smooth regulation of speed of rotation of asynchronous, synchronous motors which is capable to transform alternating current of frequency in constant, the frequency necessary for you and amplitude. The main objectives which it is necessary to solve to frequency converters for the electric motor consists not only in economy of energy resources, but also on increase in service life of the equipment. Advantages of a choice of the frequency converter — high precision in control of engines. The converter of frequency is executed taking into account the last achievements in the field of converting equipment and digital microprocessor control on the basis of modern technology with use of the advanced monitoring system of quality. The converter of frequency allows to optimize operation of mechanisms in various operating modes and provide: smooth start-up of the electric drive, besstupenchaty regulation of speed, operation of the mechanism with any demanded speed, a contactless reverse, high power rates. The converter of frequency is created for the harmonious solution of problems of control of engines and the equipment in modern industrial systems, and thanks to high power factor, the electric drive doesn't demand use of devices of compensation of jet power. Besides, use of the frequency operated electric drives with converters of frequency provides reduction of starting currents, improvement in general of dynamics of operation of the electric drive, reduction of wear of mechanical links, increase in service life of technological installations, ample opportunities of automation of technological process at the modern level.