Variable speed AC drives —applications in mining

CIM Bulletin, Vol. 79, No. 891, 1986

KURT D. MITCHELL, Design Engineer, Reliance Electric Ltd., Stratford, Ontario

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.