Statement of work Design a direct torque control system for 3-phase induction motor Implement a variable speed drive system Obtain maximum torque control by estimating speed and torque Bader Abdulmane

Team structure Badar Abdulmane (Software Designer) Dr Sam Ali (Project Supervisor) Imran Ahmed (Team Leader) Rajveer Singh Boparai (Hardware Designer) Bader Abdulmane

Project background DC motors have the best performance but are very expensive AC motors are cheaper, require less maintenance and have a longer life span System have been developed to control speed of the AC motors Variable frequency drives Flux vector drives Bader Abdulmane

Direct torque control Direct torque control was invented by Manfred on 20 th October 1984 Controls the torque therefore the speed of the motor No speed or position sensor needed [1] [1] DTC Block Diagram Bader Abdulmane

Cost ItemQuantityCostTotal Microcontroller 1$50 Heavy duty IGBTs module 1$30 Heavy duty Bridge Rectifier 1$25 Voltage Sensor 1$65 Current Sensors 2$26$52 Keypad 1$15 LCD (Display) 1$35 Total$272 Rajveer Singh

Resources required ToolsSoftware PackageDocumentsConsumable ComputersMicrosoft OfficeDatasheetsPCB making Wire CuttersMatlabThesisComponents CablesEagle CadSoftElectronic JournalsInternet Allowance Soldering IronAltiumArticlesPrinter Quota MultimeterMultiSime-booksElectricity (220V, 50Hz) OscilloscopeAtmel Studio User Guides for Software Packages Fuel Expenses Function GeneratorAVR StudioMobile Phone Expenses Pliers Rajveer Singh

Risk management Risk management is a part of project management Provides risk-free work environment Key to success of the project Helps achieving the target Rajveer Singh

Risk rating matrix(cont.) Categorizes risk consequence and risk impact Risk level can be determined by (Likelihood * Impact = Risk level) Rajveer Singh

Risk management process Rajveer Singh

Project schedule Rajveer Singh Documentation Project Plan OH & S Progress Report Final Report Log Book Research Induction Motors DC Motors Direct Torque Control Hardware PCB Design Sensor Board Control Board PCB Construction Testing PCB Testing Component Testing Software Testing System Testing Programming Direct Torque control Frequency Control Direct Torque Control (Advanced) Webpage Contingency First Seminar Second Seminar

DTC system block Microcontroller 3-Phase Bridge Rectifier IGBT module 3~ Motor Voltage Sensor Current Sensors 3~ supply (138V/Phase) 3-phase bridge rectifier One voltage sensor Two current sensors IGBT module (switching inverter) 32-bit microcontroller Imran Ahmed Figure: Direct torque control building blocks

Bridge rectifier High voltage rating (800V, 35A) Input rectifier for PWM inverters Low in cost ($25) [1] Three phase bridge Rectifier [1] Imran Ahmed

Inverter (switching device) The IGBT module is ideal for three phase invertor application Low cost ($30), usually inverter are very expensive Some important feature of this IGBT module Smart shutdown function with a single pin Built in temperature sensor [1] STGIPS20K60 (IGBT Module) [1] AL_LITERATURE/DATASHEET/CD pdf Imran Ahmed

Microcontroller ATMEL AT32UC3C264C AVR microcontroller High performance low power 32-bit microcontroller 66MHz Crystal Less time to perform calculations due to high clock frequency High data transfer speed [1] [1] 32-bit Microcontroller Imran Ahmed

Current sensor Excellent accuracy Very good linearity Measuring range up to 25A (rms) [1] LA-25 NP Current Transducer [1] Imran Ahmed

Voltage sensor Voltage measuring range up to 500V Very good linearity Low response time [1] [1] LV-25 P Voltage Sensor Imran Ahmed

What’s next? Currently we are developing PCB design Will develop the software for DTC Will perform testing on the sensors and components This will allow us to make changes in the software according to the sensor’s output Finally we will test the circuit by driving the motor Imran Ahmed

Questions?