Comparison of motor characteristic

Description Aluminum Rotor Motor Copper Rotor Motor
Comparison of
same power
(AL->CU)
Efficiency (%) Same Efficiency Same Efficiency
Torque (N·m) 4~5 60% higher than Aluminum
Conductivity (%IACS) 63 100
Motor Size Large Downsizing, Lightening
Strength Weak
-2.5 times higher than aluminum
– Advantage to high speed operation
Motor Life Short Life extension due to copper loss reduction

Advantages of optimized motor design

Description Aluminum Rotor Motor Copper Rotor Motor
5.5kW
(Same Efficiency,
Optimized Design
AL->CU)
Weight (kg) Price ($) Weight (kg) Price ($)
Rotor/Stator 62.3 203 45.5 162
Windings
Rotor Conductor
Shaft/Housing etc.
Weight & Price Savings Weight : 16.8kg ( 27% ) advantage / Price : $ 41 ( 20% ) advantage
* CDA(Copper Development Association) AL&CU Economic Analysis (2009)

Test result of castman copper rotor

FR160 /
15kW / 4P
Efficiency
(%)
Power Factor
(%)
Initial Current
(A)
Initial Torque
(%)
Remark
Al D/C Rotor 93.0 81.6 129.4 188 Efficiency Standard :
IEC 60034-30-1 (2014)
IE3(AL) -> IE4(CU)
Cu D/C Rotor
(Castman)
94.1 82.0 156.9 219