Lenze ready for IE2 efficiency
Lenze is ready to meet the efficiency level IE2 with a range of L-force geared motors that meet the efficiency levels and also give many standard options. The L-force range covers helical, shaft mounted helical, bevel, helical bevel and helical worm design in powers up to 45kW.
A wide range of modular options such as brakes, blowers and encoders are easily available. Many thousands of models with output torques from 2 to 14000 Nm are ready for orders, and an easy changeover from IE1 to IE2 motor is possible.
The new efficiency level IE2 (roughly corresponding to the old Eff. 1) represents an efficiency gain of 2 to 3% over the lower level of IE1. These new Lenze motors have efficiencies in a band from 80 to 92%. Costs are inevitably higher as the motor construction requires more copper, but on a 2.2kW geared motor the extra cost for IE2 represents typically an increase of less than 10%.
For reasons of compact dimensions and low costs, Lenze use AC motors that are integrated into the gearbox casing. Output torques and speeds are offered at 50Hz, 60Hz for America and 87Hz, a frequency that gives increased power and dynamics with the possibility of purchase cost reductions. Changing to IE2 causes small changes in the electrical data (lower running currents and higher starting currents) and also the rated motor speed. In some cases dimensions may change although Lenze has been successful in minimising the change with only two powers requiring a step up in frame sizes. Data in the same format is available for both IE1 and IE2 motors, so comparison and changeover is easy.
