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- W3109555589 abstract "Many ore bodies being currently developed are in remote locations and are consequently served by electrical power supply systems of limited capacity. The largest single components of the electrical systems of an underground mine are usually the production hoist drives; the power demands of these drives vary continuously throughout each hoisting cycle. Before 1970, mine hoists were driven by either wound rotor induction motors or dc motors in conjunction with motor-generator sets. Static power conversion equipment now costs less to purchase and install and is claimed to be more efficient than motor-generator sets. On the debit side, however, such equipment can adversely affect the hoist motors, it operates at relatively low power factors, and it produces harmonic currents. The effects of static equipment on both dc motors and ac power systems are discussed, and the relative power consumption of the three classes of hoist drives is calculated. When comparing equivalent rotating and uncompensated static power conversion equipment, it is shown that losses in the static power conversion equipment are about equal to the losses in the synchronous motors. The energy consumed by the silicon controlled rectifier drive is ca 90% of that of the motor-generator set drive. 1 ref., 8 figs., 2 tabs." @default.
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- W3109555589 date "1993-10-01" @default.
- W3109555589 modified "2023-09-27" @default.
- W3109555589 title "Factors influencing the selection of mine hoist electrical drives" @default.
- W3109555589 hasPublicationYear "1993" @default.
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