Automation of mine freight hoisting with asynchronous drive
Abstract
Advantages of automatic hoisting consisting in increase of productivity, increase of reliability of work and safety, and also release of labor of a highly skilled machinist and a great spread in the Soviet Union of hoisting installations with asynchronous motors make the problem of automation of hoisting with asynchronous drive very actual. The solution of this problem has been started since 1932-1933. However, despite the twenty-year period since the first studies on this issue, the problem has not been completely solved so far. The reason for this lies in the unfavorable mechanical properties of the induction motor, which make it difficult to automate the lifting, as well as in the known one-sidedness of the solutions offered so far, based, as a rule, on the use of mechanical shoe brakes during the deceleration period. In spite of numerous researches, conducted mainly by V. B. Umansky and V. S. Tulin, it is impossible to create a good solution. S. Tulin, it has not yet been possible to create good stroke controllers acting on the mechanical brake of a hoisting machine. And if the automation of starting the hoisting machine is solved today, the question of controlling the hoisting machine during deceleration requires theoretical and experimental study. The analysis of operation of various systems of hoisting automation, based on comparison of mechanical characteristics of various braking devices, allows us to critically evaluate these systems and outline new directions in solving the problem of automation of freight hoisting with asynchronous drive.
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