How would you define the most effective frequency inverter for electric AC motor control?

The most effective inverter is which has universal optimized input converter with quality power conditioner to work flowlessly in any harsh environment as well as in bad power conditions with output module to excute the basic purpose of driving the motor in any kind of load conditions without affecting the life cycle span of motor.

The frequency inverter which would be Easy to produce, Easy to install for all application, Easy to sell, Easily recover customer's investment ans Easily adopt green power.

Frequency inverter comes in a lead role for energy saving products for the all industries using electrical motors.

Main function of inverter is to vary the speed of the motor as per requirement and for some application provide high torque.

But main problem come with all frequency inverters is harmonics, industries which are using large no. of inverter and other power electronics devises face too much problem of harmonics.

So i think most effective inverter is define which generates less harmonics or having inbuilt harmonic filters, having less size, Accurate measurement of speed vs. torque., gives you max., gives max. saving in terms of energy, maintanance of machine, motor.

Most important thing it's time to have 12 pulse drive for even for LV 200 KW & above application, so it generates less harmonics.

There have been many attempts to migrate the application of frequency inverter from simple speed regulation to true servo control, which means closed-loop control of speed and position. The frequency inverter servo cannot handle all of the applications that a traditional servo can, but many applications don't require the full capabilities of a "true" servo. Driven by advances in its capabilities, the inverter servo approach is gaining in popularity, primarily because when applied properly it can reduce system complexity and provide significant savings in initial and ongoing costs.
So most effective drive of today will be which can define how to leverage the ongoing evolution of the frequency inverter into a drive scheme for servos.