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Your search keyword '"Mirzaeva, Galina"' showing total 180 results
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180 results on '"Mirzaeva, Galina"'

39. Evaluation of current density in DC motor brushes for mining machines based on air-gap field measurement

Author

Mirzaeva, Galina, Betz, Robert, and Summers, Terence J.

Subjects
Mineral industry -- Equipment and supplies, Mining industry -- Equipment and supplies, Brushes, Electric -- Evaluation, Electric currents -- Measurement, Mathematical models -- Usage, Mining machinery -- Electric properties, Mining machinery -- Research, Mining machinery -- Materials, Business, Computers, Electronics, Electronics and electrical industries
Published
2010

40. A high-performance drive for the rotary coal breaker application

Author

Mirzaeva, Galina and Coates, Colin

Subjects
Induction electric motors, Coal industry, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper considers recent advances made within the field of electric drives and how this new technology might be best applied within the mining industry. A case study is presented showing simulated results of the performance of the electric drives in a coal preparation plant. The various starting methodologies (resistance starting, fluid coupling, V/f = const, and vector control) are compared within this application. The merits of each method are then discussed with regard to the specific application and other more generic applications within the mining industry. Application of a rotor flux orientation control drive is substantiated, and its superior performance under start and stall conditions to that of the currently implemented system is confirmed by theoretical analysis and simulations. Experimental results for a scale model of the candidate system are presented, which agree with the main conclusions of this paper. Index Terms--Induction motor drives, mining industry applications, rotary coal breaker (RCB).

Published
2009

42. Frame alignment stability issues in natural field orientation

Author

Betz, Robert E. and Mirzaeva, Galina

Subjects
Induction electric motors -- Design and construction, Stability -- Evaluation, Industrial electronics -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Natural field orientation (NFO) is a technique for generating a rotating reference frame position for an induction machine aligned with the stator flux. The term 'natural' is applied because there is an implicit tendency for the rotating frame to realign with the correct stator flux frame position if there is a perturbation away from this position. However, under regeneration conditions this realignment property does not occur, and the frame position, if perturbed, will move the control reference frame away from stator flux alignment. This paper examines this frame alignment stability problem and proposes a solution that retains the features and simplicity of the NFO concept. Index Terms--Natural field orientation (NFO), reference frame stability, vector control.

Published
2008

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