Operation algorithm of the hoist electric drive based on a doubly-fed machine with combined control

Currently, a large number of existing mine hoisting installations use the electric drive based on an induction motor with a rotary station. Despite the fact that such drives have a large overload capacity and linear (within the working areas) mechanical characteristics, they have drawbacks, first of all – significant energy losses. A promising way for modernization of such drives, as well as design of new ones based on a wound-rotor induction motor, is to use a doubly-fed machine. In the article the operation algorithm of the hoist electric drive on the basis of a doubly-fed machine is given. The algorithm realizes a combined method of controlling the machine in the speed function, combining asynchronous and synchronous modes of operation with the mode of changing the active rotor resistance. The control of the hoist electric drive in accordance with the proposed algorithm allows the required range of machine speed control to be reached while maintaining the overload capacity on the entire control range.