Electronic Timers

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  Electronics, Control System and Instrumentation

  Twin Rotor Mimo System

  The Twin Rotor MIMO System (TRMS) behaviour resembles that of a helicopter. From the control point of view it illustrates a high order nonlinear system with significant cross-couplings. A mathematical model design of TRMS needs knowledge of aero dynamical physical laws. The TRMS system has been designed to operate with a PC-based digital controller that communicates with the position, speed sensors and motors by a dedicated I/O. The I/O board is controlled by the real-time software which operates in the MATLAB / Simulink RTW/RTWT environment.

  The TRMS consists of a beam pivoted on its base so that it can rotate freely both in the horizontal and vertical planes. At both ends of the beam there are rotors driven by DC motors. A counterbalance arm with a weight at its end is fixed to the beam at the pivot. The state of the beam is described by four process variables: horizontal and vertical angles measured by encoders fitted at the pivot, and two corresponding angular velocities.

  Two additional state variables are the angular velocities of the rotors, measured by speed sensors coupled with the driving DC motors. In a real helicopter the aerodynamic force is controlled by changing the angle of attack. In the TRMS the angle of attack is fixed. The aerodynamic force is controlled by varying the speed of rotors. Significant cross-couplings are observed between actions of the rotors. Each rotor influences both position angles. A design of stabilising controllers for TRMS is based on decoupling.

  Key Features

  • MIMO system for real-time experiments
  • Integration with MATLAB and Simulink for real-time controller generation
  • The software enables rapid prototyping of real time control algorithms:
  • Method of rapid prototyping of user-defined controllers
  • Library of basic controllers and getting started teaching manual

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  Electronics, Control System and Instrumentation

  Power Electronics Lab

  The Power Electronics Lab is used to perform power electronics circuit experiments. Student studying the characteristics of power electronics devices and the applications of power devices will find this an essential piece of equipment. The applications of power devices are in alarm circuit, lamp flasher, rectifiers, choppers, inverters and also commutation circuits.

  Experiments:

  • The characteristics of SCR
  • The characteristics of UJT
  • The characteristics of MOSFET
  • The characteristics of IGBT
  • The characteristics of DIAC
  • The characteristics of TRIAC
  • The characteristics of PUT
  • The class B commutation circuit
  • The class C commutation circuit
  • The class D commutation circuit
  • The class F commutation circuit
  • Resistor triggering circuit
  • Resistor-Capacitor triggering circuit (half-wave)
  • Resistor-Capacitor triggering circuit (full-wave)
  • The SCR triggered by UJT
  • The SCR triggered by 555IC
  • The SCR triggered by Op-Amp 741IC
  • Ramp and pedestal triggering circuit using anti-parallel SCR in AC load
  • The UJT relaxation oscillator
  • The voltage commutated chopper
  • The Bedford inverter
  • The single phase PWM inverter using MOSFET and IGBT
  • The half-wave controlled rectifier with resistive load
  • The full wave controlled rectifier (mid-point) with resistive load
  • The fully controlled bridge rectifier with load

  Key Features

  • Functional blocks indicated with on board mimic
  • Pulse generator with frequency and duty cycle control
  • Single phase rectifier firing circuit with firing angle control
  • Pulse amplifier and isolation transformer
  • Breadboard for circuit experimentation

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