Modular motors meet all efficiency demands
A
SEW Eurodrive product story
Edited by the Engineeringtalk editorial team
Feb 22, 2008
SEW Eurodrive has included many new developments in its modular DR motor series.
SEW Eurodrive reckons it may not necessarily have reinvented the principles of standard asynchronous motors, but the company has included many new developments in its modular DR motor series.
There are a number of well established trends in drive engineering, such as the continuing efforts to minimise energy use.
One option for saving energy is to operate electric motors exclusively with frequency inverters in a controlled fashion.
But even the electric motor itself can make a significant contribution to reduced energy consumption.
Laws have already been passed in North America, Australia and New Zealand that prescribe the use of energy efficient motors.
South America and many Asian countries are moving in the same direction.
Europe has been addressing the topic of energy savings by issuing its EuP guidelines.
SEW Eurodrive recognised this trend very early on, and five years ago the company was the first to introduce energy efficient motors based on die-cast copper technology.
Another trend seems to be driven by the requirements of the logistics industry: the demand for small, compact and decentralised drive solutions for use in handling and transportation systems.
SEW Eurodrive has identified and evaluated these and other trends.
The result is the new modular DR motor system, which the company reckons will set a new standard in drive engineering.
The DR motor already meets future demands for the efficiency ratings of asynchronous motors.
The DR motor system integrates all current requirements regarding efficiency worldwide (standard, high and premium).
The motors are optionally available with rotors featuring a second-generation copper cage.
A new modular brake design offers the choice of two or three brake sizes for each motor.
Brake motors with inverter control require less braking action and therefore lower braking torques are required for energy efficient motors.
It is also a lot simpler to install or remove BE generation brakes on size 90 DR motors.
These BE brakes are mounted on a friction plate and can be easily removed.
Many tasks require only simple positioning and velocity detection (for example using synchronous encoders).
The high-resolution encoders installed on the non-drive-shaft end are often far too complex for this task.
SEW Eurodrive has developed two new, fully integrated and very affordable encoders for the DR motor.
They can be easily retrofitted.
The encoder resolution is between 1 and 100 pulses per revolution, and a rotation counter will be added in the near future.
The mounted encoders have been optimised as well.
The standard encoders can now be mounted directly to the shaft and fan guard even for larger motors - four-pole from 7.5 to 55kW.
The mounted encoders with sine/cosine signals have been equipped with a new, simpler connection.
The input shaft assembly makes for easier connection of encoder cable and change of encoder.
The company has also optimised the motor sizes as well as the available options.
Many drives are more compact, ie they are narrower or shorter when compared with the DT/DV series.
There are simplified cable connections for the small motors with enhanced connection space.
There is an option to connect using cage tension springs instead of the terminal board to make wiring easier for installers.
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