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Laboratory setup for variable speed control of a three phase AC Induction Motor using a DSP Controller

Wajiha Shireen, Robert Escalante University of Houston

Abstract:

This paper presents the hardware and software aspects of a Digital Signal Processor (DSP) based controller for AC Induction motors. The hardware part of the setup consists of a DSP module, a three-phase inverter module and an interface module. The system implementation involves the use of different software modules to achieve the desired variable speed operation in open loop or closed loop. This setup can be effectively utilized to demonstrate to students the various motor control functions for variable speed operation and how it can be controlled in software by a DSP controller. DSP based systems have become an indispensable part of many modern equipment and industrial processes. Laboratory experience from the setup presented in this paper will familiarize the students to state of the art variable speed motor control methods that are being used in the industries. The setup can also be used as a research platform to test different motor control algorithms.

Introduction:

Electric motors have wide application in industry, such as in the control of fans, pumps and compressors. There are many special applications, such as variable speed air-conditioners, heat pumps and furnaces, where a range of motor powers would be preferred. This has led to the development of electric motors with variable-speed drives. A full range of variable-speed drives are currently available and are being used in industries, with motor sizes ranging from fractions to thousands of horsepower. The capability of varying the speed of an electric motor to match the load required by their end-use system will optimize its performance and minimize energy use. Tests with pump, fan and compressor applications have indicated typical energy savings of 20- 50% using motors with variable speed drives.

Electric motors are taught very justifiably in almost all Universities along with some basic motor control methods. However, in order to keep pace with the industrial changes, present day Electrical Engineering or Technology students need to know the state of the art variable speed motor control methods that are being used in the context of exciting new applications. In view of this, this paper presents the hardware and software aspects of a Digital Signal Processor (DSP) based controller for ac induction motors. This setup can be effectively utilized to demonstrate to students the various motor control functions for variable speed operation. This

Proceedings of the 2002 American Society for Engineering Education Annual Conference & Exposition Copyright © 2002, American Society for Engineering Education

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Vanapalli, S., & Shireen, W. (2002, June), Laboratory Setup For Variable Speed Control Of A Three Phase Ac Induction Motor Using A Dsp Controller Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--10277