Introduction to Mechatronic

Introduction to MechatronicName: Syiamallan A/L VeerrakkumarnGroup : 2K14CME3Lecturer Name : Mr. AfwanIntroduction to Motion Control The basic job of a motion control system is to control the position, velocity and/or acceleration of some load.A motion control system consists of an actuation system, a sensor (or sensors), and if required, a control device.In an open loop system, a command is sent directly to the actuation system to move the load, and a sensor is used to verify the response.In a closed loop system, a command is made to the controlling device that, in turn, commands the actuation system to move the load. Feedback is used to automatically correct for response errors.

Hydraulic actuatorsSingle acting: work can be done only in one directionPistonDouble acting piston:Piston rod on both sides

PlungerWork is done in both directionsTelescopicTelescopic

Fast movingTandem

Fast moving

5Pneumatic Actuators

INTRODUCTION OF DC MOTORA DC Motor is a machine which converts electrical energy into mechanical energy. It depends for its operation on the force which is known to exist on conductor carrying a current while situated in a magnetic field.

TYPES OF DC MOTORSHUNT MOTOR Shunt Motor in which the field winding is connected in parallel with the armature

SERIES MOTOR- Series Motor in which the armature and field winding are connected in series

COMPOUND MOTOR- This type of motor has two field winding, one of which is connected in parallel with the armature and other in series with it

Working Principle Of DC MOTOR Whenever a current carrying conductor is placed in a magnetic field, it experienced a force whose direction is given by Flemings Left Hand Rule.It shows the field set up by the polesIt shows the conductor field due to flow of current in the conductor

AC MOTOR: INDUCTION MOTOR

Most common motors in industryAdvantages: Simple designInexpensiveHigh power to weight ratioEasy to maintainDirect connection to AC power source

MOTOR WINDINGAC-SINGLE PHASE MOTOR WINDING

AC-THREE PHASE MOTOR WINDING

A.C. Servo Motor

D.C. Servo Motor

Low power output of about 0.5 W to 100 W.Deliver high power output.Efficiency is less about 5 to 20%.High efficiency.Due to absence of commentator maintenance is less.Frequent maintenance required due to commentator.Stability problems are lessMore problems of stability.No radio frequency noise.Brushes produce radio frequency noise.Compare to DC servo motor it is relatively stable and smooth operation.It is Noisy operation.AC amplifier used have no drift.DC Amplifier used have a drift.Following are main difference between AC servo motor & DC servo motor

DC Servo Motor PictureAC Servo Motor PictureBrushless Permanent Magnet DC MotorContains a permanent magnet rotor and fixed stator windingStator windings are typically three-phaseContains a converter that converts DC into pulsating DCDC pulses are applied to stator windings to produce a rotating fieldAlso contains a sensor to detect the position to switch the current stator coilsStepper MotorsSequence of (3 or more) poles is activated in turn, moving the stator in small steps. Very low speed / high angular precision is possible without reduction gearing by using many rotor teeth. Can also micro-step by activatingboth coils at once.

RotorStatorCoils

Outside CasingStatorRotorInternal components of a Stepper Motor20

Winding number 1

Winding number 2One step6 pole rotor21

Four Steps per revolution i.e. 90 deg. steps.Full Step Operation22

Paper feeder on printersCNC lathesStepper motorsStepper motor applications23Drive Selction & Application