Lenze offers IE2 efficiency class gearmotors up to 45kW
20 April 2010
The regulation IEC 60034-30 requires all new three-phase ac electric motors from 0.75kW upwards to meet efficiency level IE2 from June 2011. Lenze is ready now for the change 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 torque from 2 to 14,000Nm 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%. Furthermore, although the efficiency gain from changing to IE2 is small, the payback times are short. In the case of a 2.2kW geared motor the gain is 2.3% and the payback is around 5,000 running hours.
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 have 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.
L-force geared motors have standard options which cover practically all requirements. These include a choice of brakes, blowers, incremental and absolute encoders, handwheels, rain covers and terminal box mounted inverters. Surface protection for outside use and for cold areas with condensation is also offered. Geared motor delivery times are typically 2 to 4 weeks and urgent requirements for fast deliveries can usually be met.
L-force geared motors give designers a choice between standard IE1 and high efficiency IE2 geared motors. They can be combined with high efficiency gearboxes so that a motor efficiency of 92% can be matched to a gearbox with efficiency 97% making truly energy efficient drive. A full range of gearbox and motor options are ready for delivery. With gearboxes already matched to the IEC performance of the motor, Designers have a simpler task to select the optimum geared motor.
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