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The stator, which forms the inner core of the motor, consists of around two kilometres of wound copper wire. Unlike other electric motors in the same power class, the motor of the BMW i3 is very small and compact due to the specially configured winding of the copper wiring. This results in further weight and space savings. Before the rotor is fitted in the interior housing, it receives a thin coating of resin.

Watch the BMW i3 being built from start to finish. Part 2: e-transmission assembly, electric engine construction, cockpit and dashboard moulding.

copper demand may be the highest in at least four years in 2011 as sales of home appliances and vehicles boost consumption of the metal, Tongling Nonferrous Metals Group Co., the nation’s second-largest copper producer, said.