GEARLESS ELECTRIC DRIVE OF ROTOR OF ELECTROMAGNETIC SEPARATOR
The aim of the work is to increase the reliability and durability of the electromagnetic rotor type separator due to application of a gearless electric drive for rotor. In the process of high-gradient magnetic separation, the drive must ensure stable rotation of the massive rotor at low speeds, smooth transients of the entire electromechanical system during the starting, stopping and changing of the rotor speed. And also, it is necessary to provide a quick response of the electromechanical system in emergency situations. A characteristic feature of a gearless electric drive is that its individual elements, such as the shaft, bearings, rotor, are built directly into the construction of the separator, the motor itself does not exist separately. The article presents the basic expressions for arc-mounted electric motor and its mechanical characteristics. The advantages of a gearless electric drive and ways of increasing the efficiency of work in a system with a rotor of an electromagnetic separator are illustrated. Thanks to the use of a gearless electric drive for the rotor of an electromagnetic separator, the entire kinematic chain of gears and a high-speed electric motor are eliminated, and only two low-speed bearings remain in which the rotor rotates. Since the rotation speed of the rotor is low, about 10 rpm, the service life of such bearings will be quite large. Reliability indicators of arcforming machines are similar to conventional transformers. From the design of the drive, all rubbing and, consequently, wearing parts are eliminated and there are no elements and devices in it that require routine maintenance during operation. Thus, the development of an arc-core electric drive for the rotor of an electromagnetic separator makes it possible to obtain qualitatively new indicators of reliability and durability. For remote mining and processing plants, where valuable and expensive concentrates are mined, the issues
of improving reliability and uptime are the most important.