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Copyright of Scientific Bulletin of National Mining University is the property of National Mining University, State Higher Educational Institution and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Scientific Bulletin of National Mining University is the property of National Mining University, State Higher Educational Institution and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Scientific Bulletin of National Mining University is the property of National Mining University, State Higher Educational Institution and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Scientific Bulletin of National Mining University is the property of National Mining University, State Higher Educational Institution and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article is devoted to study of tumbling mill synchronous drive dynamics. The goals of the research are the follows: determination of synchronous drive elastic characteristic, foundation of their mathematical model and making up of dependences for the definition of electromagnetic rigidity. The equivalent scheme of synchronous drive as an oscillator is presented in the article. It is shown, that the electromagnetic rigidity of synchronous drive is the major parameter of the drive mechanical system. It is shown, that the electromagnetic characteristics of synchronous drives are essentially depended on transition processes in the drive electromagnetic system. The calculation technique of synchronous drive electromagnetic rigidity coefficient is presented. The coefficient of rigidity is determined by the investigation of electromagnetic moment oscillations under the action of drag torque which is varied stepwise. It is founded, that the elastic characteristic of synchronous drive can be approximated by linear dependence with constant value of rigidity coefficient. The numerical investigations of the dynamics of several synchronous drives are carried out. The input data for calculations are obtained on the basis of corresponding drive logbooks. The calculations are carried out by integration of Park-Horev equations. The calculation results of characteristic oscillation frequency, electromagnetic rigidity coefficient and energy dissipation coefficient of corresponding drives are presented. The dependences are obtained which allow determining the electromagnetic rigidity of synchronous drive at nominal conditions of work taking into account the drive power and the rotor rotation frequency. It is shown, that to a first approximation the electromagnetic rigidity is in direct proportion to drive power and is inverse proportion to rotation frequency in third order. The calculated dependencies for determination of angle of rotor departure and characteristic oscillation frequency are obtained. [ABSTRACT FROM AUTHOR]