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Sensorless FOC of an AC induction motor

Posted: 05 Dec 2008     Print Version  Bookmark and Share

Keywords:AC induction motor  sensorless field oriented control  dsPIC 

The requirement of low-cost, low-maintenance, robust electrical motors has resulted in the emergence of the AC induction motor (ACIM) as the industry leader. Typical applications requiring the use of an induction motor drive range from consumer to automotive applications, with a variety of power and sizes.

Where efficiency, low cost, and control of the induction motor drive is a concern, the sensorless field oriented control (FOC), also known as vector control, provides the best solution. The term "sensorless" does not represent the lack of sensors entirely, but the fact that in comparison with other drives from the same category of field oriented control, it denotes that the speed and/or position sensor is missing. This feature decreases the cost of the drive system, which is always desired, but this is not the only reason for this approach, as some applications have requirements concerning the size, and the lack of additional wiring for sensors or devices mounted on the shaft (due to hostile environments such as high temperature, corrosive contacts, etc.).

This application note by Microchip is to presents a solution for sensorless FOC of induction motors using a dsPIC digital signal controller.

View the PDF document for more information.

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