DSP based control of slipring induction motor
This project deal with the control the speed of slip ring induction motor using Digital signal processing. The main intension is to design a system which gives accurate speed control with maximum efficiency and without any energy loss. In the existing methods of speed control it is possible to control either the stator or rotor section, but this system can control both the stator and rotor.
This document presents a solution to control an AC induction motor using the
TMS320LF2407A. This new family of DSP controllers enables cost-effective design of
Intelligent controllers for AC motors which can yield enhanced operation, and increased efficiency. The algorithm maintains efficiency in a wide range of speeds and takes into consideration torque changes with transient phases by processing a dynamic model of the motor.
Pulze Width Modulation is the most commonly used method for the speed control of any motor. PWM inverters where designed using either BJT or MOSFET. The insulated gate bipolar transistor (IGBT), which was introduced in the early 1980s, has become a successful
device because of its superior characteristics. The IGBT is a three-terminal power semiconductor switch used to control electrical energy. Prior to the advent of the IGBT, power bipolar junction transistors (BJTs) and power metal oxide field effect transistors (MOSFETs) were widely used in low to medium power and high-frequency applications,
Where the speed of gate turn-off thyristors was not adequate. So we are using IGBT based PWM inverter for accurate speed control.
The choice of DSP kit is to make the digital control of motor possible. Analog speed control methods have a big disadvantage of energy loss which is greatly minimized using digital control.