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Using the dsPIC30F for vector control of an ACIM

Posted: 25 Aug 2008     Print Version  Bookmark and Share

Keywords:AC induction motor  motor application  vector control  "Volts-Hertz control" 

The AC induction motor (ACIM) is the workhorse of industrial and residential motor applications due to its simple construction and durability. These motors have no brushes to wear out or magnets to add to the cost. The rotor assembly is a simple steel cage.

ACIM's are designed to operate at a constant input voltage and frequency, but you can effectively control an ACIM in an open loop variable speed application if the frequency of the motor input voltage is varied. If the motor is not mechanically overloaded, the motor will operate at a speed that is roughly proportional to the input frequency. As you decrease the frequency of the drive voltage, you also need to decrease the amplitude by a proportional amount. Otherwise, the motor will consume excessive current at low input frequencies. This control method is called "Volts-Hertz control".

This application note describes a vector control application that is written for the dsPIC30F family of devices. Except for a brief discussion on control theory, the information presented assumes you have a basic understanding of ACIM characteristics. References are included in some instances to provide background information.

View the PDF document for more information.





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