Energy-saving motors with copper rotors are not technically viable but also economically!
It is also possible to specify an ecological payback period. This is even shorter: an efficient motor has saved so much energy within a few weeks or latest a few months as was required for the acquisition of the additional alternative material.
(Source: „Sparen mit dem Sparmotor“, The German Copper Institute (DKI))
Conservation of resources
Nowadays, used products are recycled and integrated into material cycles. The copper rotor is made up of easily separable copper and iron and therefore presents no waste after its very long service life, but rather is a sought-after source of raw materials.
Copper high pressure die casting requires a high purity of the melted mass and a casting temperature of approx. 1,150 °C. These prerequisites are in place and therefore cost-effective series production is possible. In order to further improve the efficiency of energy-saving motors, the cage cast in the motor’s rotor can be manufactured using copper instead of aluminium high pressure die casting.
This results in the following advantages:
- Energy conservation as a result of high efficiency over the entire performance including part load
- The speed torque course is significantly steeper
- Higher maximum motor performance thanks to a greater number of revolutions at the tipping point
- Lower additional losses
- A smaller construction volume as compared to an aluminium rotor motor of equal power and efficiency
The deployment of energy-saving motors is worthwhile from a technical and ecological standpoint; amortization is possible in periods of between a few months and a maximum of 3 years.