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Tests Show Mass-Produced Copper-Rotor Motors More Efficient Than Nameplate Claims
Siemens’ “Above NEMA” Motors Are Also Cost-Competitive The underlying question: Is the improved efficiency of copper-rotor motors so sensitive to materials and process controls that consistently meeting levels higher than NEMA PremiumTM under mass-production conditions might prove elusive? And, if that isn’t enough to worry about, would the manufacturing cost savings projected in a 2005 Update fall victim to the elevated copper market costs seen since then? The CDA study, which predicted cost reductions of 14% and 18% for 7.5-hp and 15-hp motors, respectively, was conducted when both copper and steel prices were a fraction of what they are today. Not to worry! The news is entirely positive on both counts. In fact, it’s much better than expected. As Update readers are well aware, the Siemens Energy & Automation (SEA) unit of the giant international electrical equipment manufacturer announced earlier this year that it was bringing to market a line of ultra-efficient motors based on the CDA-led consortium’s copper die-casting process (Figure 1). The copper-rotor motor had finally and decisively made the leap from laboratory to mass production! A press release describing the announcement is published elsewhere on this website. Additional details, including nameplate efficiency data and pricing information, can be found on the relevant SEA website. 
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