200KHz 1 CH Pocket Oscilloscope

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  Electronics, Control System and Instrumentation

  Modular Servo Workshop

  The Modular Servo Workshop (MSW) system has been designed for the study and practical application of basic and advanced control methods. These included typical variable factors such as friction, damping and inertia and a number of position/speed control methods ranging from PID to LQ and time-optimal control. The flexible design of the MLS allows the configuration of a system to be modified to suit user requirements.

  The MSW has an integrated environment for the analysis of digital servo control problems and synthesis of control algorithms. The system comprises several hardware units, and software. The DC motor module can be coupled with several other modules by timing belts. A number of linear and nonlinear mechanical modules have been designed to show the influence of backslash, damping, elasticity and friction. The units may be studied individually before completing the system. The linear damping module consists of a paramagnetic disc which runs between the poles of the permanent magnet. The inertia module contains a solid metal roll. The encoder module is used to measure the rotational angle. A steel base plate provides firm fixing to the modules, enabling imitation of block schematic diagrams, however, all electrical connections are performed inside the software.

  The system can be classified as multivariable (SIMO) with two measurable states and one control variable.

  The MSW operates with a PC based digital controller that communicates with the position sensor and motor by an I/O board. The I/O board is controlled by the real-time software which operates with MATLAB/Simulink. A comprehensive range of experiments may be carried out using Modular Servo and associated software.

  Key Features

  • Laboratory model of servo system compound with different modules
  • Modules to demonstrate: inertia, backslash, damping, elasticity and friction
  • Multivariable SIMO
  • Rapid prototyping of real-time control algorithms
  • Full integration with MATLAB Simulink. Operation in real-time

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• 

  Electronics, Control System and Instrumentation

  Washing Machine Simulator

  The Washing Machine Simulator (WMS) is an application for electronic control engineering. The unit incorporates a series of input and output devices, which together simulate the actions of a typical domestic washing machine. The WMS has two main areas. The first area comprises the electronic circuits and connector sockets, the second area is the indicators, a motorised disc (which represents the washing machine drum) and the user controls. The circuit board incorporates test points, a fuse and four switches for fault insertion.

  Three blue push buttons are used to select a ‘wash program’ from the software program and inputs from these buttons turn on green, yellow and red LED’s. The binary pattern displayed may be compared to a ‘program selector table’ to indicate the current choice of program. A grey push button is used to cancel the current choice and a red push button to ‘accept’ input for the controller. A mechanically latched push button with a built in LED provides an input, which simulates the open/closed status of the washing machine door. An infra-red reflective sensor mounted beneath the disc supplies feedback on the speed of the motor. A seven-segment display is used to highlight the ‘wash program status’. The status options are: Empty, Fill, Heat, Wash, Rinse, Spin, Dry and Complete.

  Motor speed can be controlled using PWM and a buzzer activated to indicate the end of the ‘wash program’ (can be enabled or disabled using on-board switch). The buzzer can also be used to indicate that the ‘door’ has been opened or that a fault has occurred. Variations for programming the WMS are possible using two switches that change the input/output characteristics of the motor drive and speed sensor feedback. The WMS can be connected to a PC, using a suitable interface, or to a microcontroller.

   Experiments:

  • Control of digital outputs
  • Control of the seven segment display
  • Reading the program selector switches
  • On/Off control of the DC motor
  • Controlling the DC motor/speed open loop
  • Reading the motor speed feedback
  • Colour wash program cycle
  • Closed loop control of the DC motor

  Key Features

  • Simulates actual domestic washing machine processes
  • Control of DC motor, speed and direction
  • Closed loop and PWM control of DC motor
  • Target application for PC or Microcontroller
  • Test Points and Switched Faults for diagnostics fault finding techniques
  • Visual indication of activities using LEDs and display

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