I selected sensor less speed control of Induction motor as my research area. I like to know whether sensor less controlled induction motor performance match with IM motors with sensors and possible applications of sensor less controlled induction motors in industries.
Hello Savitha Pr,
If you want ur motor system run at a very low speed range, you'd better to select sensored method.If you don't consider the low speed and heavy load situration, and want to reduce the cost of ur system. you can take sensorless. By the way, speed control accuracy of sensored is better than that of sensorless. Another approach for sonserless is called high frequency injection, this mothod can take away encoder or speed sensor and still have a very accurate performance at full speed range. Relatively speaking, it is more complicated.
Best wishes!
Generally model-based sensorless algorithms are relatively accurately at high speeds where the back emf of the machine is of significant magnitude such that any component variations are rendered negligible. Such methods fail at low speed as the back emf decreases drastically. Other sensorless methods based on assessing position dependent machine parameters are hence required.
Accuracy of sensorless systems is typically within an order of magnitude however it is very difficult to obtain the same level as that which can be achieved with high precision industry grade encoders.
Most popular applications are ones where encoder maintenance/replacement is complex or where alternative measurements system are required.
Regards,
Kris
Dear,
There are various conventional methods as suggested in previous comments which can give a comparative performance at higher speeds. Although, sensorless drives have limitations in low speed regions but performance can be improved by integrating various intelligence techniques to the conventional approaches.
In sensor less method, The determination of speed signal from an induction
motor drive system without using sensor. The dynamic equation of induction motor used to estimate the rotor speed component for control purpose. From the voltage and current estimation of rotor speed component is carried out. there are many method as:
1- Back-EMF method
2- Voltage method
3- Hall sensor.
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