This application note describes the design of a 3-phase AC

　　induction vector control drive with position encoder coupled

　　to the motor shaft. It is based on Motorola’s DSP56F80x

　　dedicated motor control device. The software design takes

　　advantage of the SDK （Software Development Kit）

　　developed by Motorola.

　　AC induction motors， which contain a cage， are very popular

　　in variable speed drives. They are simple， rugged，

　　inexpensive and available at all power ratings. Progress in the

　　field of power electronics and microelectronics enables the

　　application of induction motors for high-performance drives，

　　where traditionally only DC motors were applied. Thanks to

　　sophisticated control methods， AC induction drives offer the

　　same control capabilities as high performance four-quadrant

　　DC drives.

　　The drive application concept presented is that of vector

　　control of the AC induction motor running in a closed-spee

　　loop with the speed/position sensor coupled to the shaft. The

　　application serves as an example of AC induction vector

　　control drive design using a Motorola DSP with SDK

　　support. It also illustrates the usage of dedicated motor

　　control libraries that are included in the SDK.

　　This application note includes a description of Motorola DSP

　　features， basic AC induction motor theory， system design

　　concept， hardware implementation and software desig

　　including the PC master software visualization tool.