Abstract
High-frequency problems related to pulse-width modulation motor drive systems with long cables are widely discussed in the literature and very harmful to the system components, resulting in motor insulation failures, bearing damage, and electromagnetic interference, among others. As a solution, in a previous work, an alternative system configuration was proposed in which the rectifier and the inverter are separated through a long dc cable, the inverter being located at the motor terminals. Thus, besides the mitigation of all these problems, the proposed topology also features the additional benefit of reducing the cable power losses and the amount of copper required for the power transmission. In this context, this paper evaluates the copper economy obtained through this alternative drive configuration and presents a case study involving real motor drive systems situated in mining plants, whose actual cost of the cables is compared with that of the alternative configuration.
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