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9.3.2
Efficiency optimization
9.3.2.1
Description
For induction motors, efficiency optimization has the following advantages:
● Lower energy costs
● Lower motor temperature rise
● Reduced motor noise levels
Disadvantages of efficiency optimization
● Longer acceleration times
● More significant speed dips for torque surges
● Lower dynamic response
However, the disadvantages are only relevant if the motor must respond with a high dynamic
performance. Also when that the efficiency optimization is active, the converter motor control
prevents the motor from stalling.
Optimization techniques
Speed and torque are specified by the driven machine. As a consequence, the flux is the
remaining variable for optimizing the efficiency.
The efficiency of induction motors can be optimized using 2 different techniques. Both
techniques optimize the efficiency using the flux.
It only makes sense to activate efficiency optimization if the dynamic response requirements
are low (e.g. pump and fan applications).
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Functions, monitoring and protective functions
9.3 Drive functions
513
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