THYRISTOR DRIVES WITH DC MOTORS FOR 1000-TPH CLAM-SHELL BUCKET ORE UNLOADERS

Several years ago, Alcan undertook a port expansion program at Port Alfred, Quebec,in anticipation of the larger ships that would be docking there in the near future. This program necessitated the purchase of two 1000-tph bucket-type unloaders. Because bucket-type unloaders of this capacity require precise and rapid response of the bucket and trolley motions for optimum unloader operation, it was extremely important to select a compatible drive and control system. A study was made of the various drive systems available for this purpose, including the following: conventional wound rotor motors with magnetic contactors; wound rotor motors with thyristor control; Ward-Leonard System and DC motors; and thyristor-controlled DC motors. The study showed that any of the four systems could be used if designed properly; however, the thyristor-controlled DC motor system possessed several technical advantages over the other systems, including an economic one.

• Corporate Authors:

  Canadian Institute of Mining and Metallurgy

  906-1117 Ste Catherine Street, West
  Montreal 110, PQ  Canada 
• Authors:
  • Edward, R H
  • Hausen, G
  • Lofink, G V
• Publication Date: 1974-9

Media Info

• Pagination: p. 75-81
• Serial:
  • C.I.M. Bulletin
  • Volume: 67
  • Issue Number: 749

Subject/Index Terms

• TRT Terms: Electric drives; Ores; Thyristors; Unloaders; Unloading facilities
• Old TRIS Terms: Bucket wheel unloaders; Ore unloading systems
• Subject Areas: Freight Transportation; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00072931
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: May 1 1975 12:00AM