6/3/2016SME3252: Mechatronics Lecture 1 1 Introduction to Mechatronics Lecture 1

6/3/2016SME3252: Mechatronics Lecture Introduction Mechatronics – integration of 3 engineering fields Mechanical engineering Electrical and/or electronic engineering Computer science Word ‘mechatronics’ – by engineers at Yaskawa Electric Company

6/3/2016SME3252: Mechatronics Lecture 1 3 Electrical Engineering Mechanical Engineering Computer Science Mechatronics

6/3/2016SME3252: Mechatronics Lecture 1 4 Mechatronics engineer is trained for: Design mechanical components of a product Design electrical components – actuator, sensor, amplifier, control logic Design computer hardware and software to control product real time

6/3/2016SME3252: Mechatronics Lecture : Systems Mechtronics involves many systems System – a box with input and output Motor Rotation output Electric power input

6/3/2016SME3252: Mechatronics Lecture : Measurement and instrumentation system Components – sensor, signal conditioner, display Sensor Signal conditioner Display Quantity to be measured Value of quantity

6/3/2016SME3252: Mechatronics Lecture : Control system Maintain the output of system to the required input value ControllerActuator Process Sensor Controlled Variable Setpoint + - uce

6/3/2016SME3252: Mechatronics Lecture 1 8 Examples Block diagram for water level control system controlleractuator Water tank sensor h ref s uq0q0 h - +

6/3/2016SME3252: Mechatronics Lecture 1 9 Examples Automobile steering control system Driver Auto- mobile Measurement, visual and tactile Desired course of travel Error - + Steering mechanism Actual course of travel

6/3/2016SME3252: Mechatronics Lecture 1 10 Open-loop vs. Closed loop systems Heating room switch Electric fire Input Electric power A temperature change Decision to switch on or off Output switch Electric fire Measuring device input Deviation signal Electric power output - + T required T actual

6/3/2016SME3252: Mechatronics Lecture : Microprocessor-based controllers Microprocessors – replacing mechanical cam-operated controllers To carry out control function Advantages – variety of programs Embedded microcontroller – microprocessor integrated in a chip to perform certain task (PIC, ATMEL, etc.) Adaptable form – programmable logic controller (PLC)

6/3/2016SME3252: Mechatronics Lecture 1 12 Microprocessor - PIC Lim Kim Fung, PSM 2006/2007

6/3/2016SME3252: Mechatronics Lecture 1 13 PLC Controller inputs outputs A B C D P Q R S

6/3/2016SME3252: Mechatronics Lecture : Response of systems Response of any systems to an input is not instantaneous Kettle – takes time to boil Lens to focus in an automatic camera Bathroom scale Response systems are function of time To know how system behaves – need to model the system

6/3/2016SME3252: Mechatronics Lecture min 20 0 C time C Temperature Response for an input for a kettle

6/3/2016SME3252: Mechatronics Lecture : Mechatronics approach Mechatronics – bringing together a number of technologies Electrical, electronics, mechanical, computer technology, control engineering

6/3/2016SME3252: Mechatronics Lecture 1 17 End of Lecture 1 Reference: W. Bolton, Mechatronics, 3rd. Edition, Prentice Hall, 2003