Direct Torque Control System for 3-phase (1.5 kW) Induction motor using

microcontroller

Statement of workDesign a direct torque control system for 3-phase

induction motorImplement a variable speed drive systemObtain maximum torque control by estimating

speed and torque

Bader Abdulmane - 110045356

Team structure

Badar Abdulmane(Software Designer)

Dr Sam Ali(Project Supervisor)

Imran Ahmed(Team Leader)

Rajveer Singh Boparai(Hardware Designer)

Bader Abdulmane - 110045356

Project backgroundDC motors have the best performance but are very

expensiveAC motors are cheaper, require less maintenance and

have a longer life spanSystem have been developed to control speed of the

AC motorsVariable frequency drivesFlux vector drives

Bader Abdulmane - 110045356

Direct torque controlDirect torque control was invented by Manfred on

20th October 1984 Controls the torque therefore the speed of the motorNo speed or position sensor needed

[1] http://www.inverter-china.com/blog/upload/direct-torque-control.jpg

[1] DTC Block Diagram

Bader Abdulmane - 110045356

Cost Item Quantity Cost Total

Microcontroller 1 $50 $50Heavy duty IGBTs module 1 $30 $30Heavy duty Bridge Rectifier 1 $25 $25Voltage Sensor 1 $65 $65Current Sensors 2 $26 $52Keypad 1 $15 $15LCD (Display) 1 $35 $35

Total $272

Rajveer Singh - 110024063

Resources requiredTools Software Package Documents Consumable

Computers Microsoft Office Datasheets PCB making

Wire Cutters Matlab Thesis Components

Cables Eagle CadSoft Electronic Journals Internet Allowance

Soldering Iron Altium Articles Printer Quota

Multimeter MultiSim e-books Electricity (220V, 50Hz)

Oscilloscope Atmel Studio User Guides for Software Packages Fuel Expenses

Function Generator AVR Studio Mobile Phone Expenses

Pliers

Rajveer Singh - 110024063

Risk managementRisk management is a part of project managementProvides risk-free work environmentKey to success of the projectHelps achieving the target

Rajveer Singh - 110024063

Risk rating matrix(cont.)

Categorizes risk consequence and risk impact Risk level can be determined by (Likelihood *

Impact = Risk level)

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Risk management process

www.treasury.act.gov.au/actia/Guide.doc Rajveer Singh - 110024063

Project schedule

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DocumentationProject Plan

OH & SProgress Report

Final Report

Log Book

ResearchInduction Motors

DC MotorsDirect Torque Control

Hardware

PCB DesignSensor BoardControl Board

PCB Construction

Testing

PCB TestingComponent TestingSoftware Testing

System Testing

Programming

Direct Torque controlFrequency Control

Direct Torque Control (Advanced)

Webpage

Contingency

First SeminarSecond Seminar

DTC system block

Microcontroller

3-Phase Bridge Rectifier IGBT module 3~ Motor

Voltage Sensor

Current Sensors

3~ supply (138V/Phase)

3-phase bridge rectifierOne voltage sensorTwo current sensorsIGBT module (switching inverter)32-bit microcontroller

Imran Ahmed - 110052291

Figure: Direct torque control building blocks

Bridge rectifierHigh voltage rating (800V, 35A)Input rectifier for PWM invertersLow in cost ($25)

[1] Three phase bridge Rectifier

[1] http://australia.rs-online.com/web/p/bridge-rectifier/2278845Imran Ahmed - 110052291

Inverter (switching device)The IGBT module is ideal for three phase invertor

applicationLow cost ($30), usually inverter are very expensive Some important feature of this IGBT module

Smart shutdown function with a single pinBuilt in temperature sensor

[1] STGIPS20K60 (IGBT Module)

[1] http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00244265.pdf

Imran Ahmed - 110052291

MicrocontrollerATMEL AT32UC3C264C AVR microcontrollerHigh performance low power 32-bit microcontroller66MHz CrystalLess time to perform calculations due to high clock

frequencyHigh data transfer speed

[1] http://www.mscbp.hu/Documents/Atmel%2032bit%20AVR.pdf

[1] 32-bit Microcontroller

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Current sensorExcellent accuracyVery good linearityMeasuring range up to 25A (rms)

[1] LA-25 NP Current Transducer

[1] http://www.datasheetcatalog.org/datasheet/lem/LA25-NP.pdfImran Ahmed - 110052291

Voltage sensorVoltage measuring range up to 500VVery good linearityLow response time

[1] http://pdf1.alldatasheet.com/datasheet-pdf/view/89619/LEM/LV25P.html

[1] LV-25 P Voltage Sensor

Imran Ahmed - 110052291

What’s next? Currently we are developing PCB designWill develop the software for DTCWill perform testing on the sensors and componentsThis will allow us to make changes in the software

according to the sensor’s outputFinally we will test the circuit by driving the motor

Imran Ahmed - 110052291

Questions?