Variable speed AC drives —applications in mining

CIM Bulletin, Vol. 79, No. 891, 1986
KURT D. MITCHELL, Design Engineer, Reliance Electric Ltd., Stratford, Ontario
Abstract This paper discusses general application for A C variable frequency drives in the mining industry. A review of induction motors characteristics, adjustable frequency controller fundamentals, and three commonly used controllers is presented. General application guidelines for the three different types of controllers; variable voltage input, current source input and pulse width modulated are then reviewed in detail, and an example of the economic benefit of this technology is discussed.
Keywords: Instrumentation, Variable speed drives, Mining industry, Frequency controllers, Torque applications, Motor applications, Energy savings, Economics.
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