DRIVER FOR AN

INDUCTION MOTOR Project object: To design and develope a prototype for driving an induction motor to be used on the concrete vibrators.

Industry :ONİŞ A.Ş.

Present team :Begüm Coşkun

students (Sadık Turgut)

Supervisors : Celal Zaim Çil

Klaus Schmidt

The company was founded in 1962 to manufacture the construction machines and tools and also provide services to customer, and selling construction tools and goods. It is located in OSTIM.

CONCRETE VIBRATOR

Spectifications of the circuit;

Input:220Vac,50 Hz line voltage(1-phase)

Output:55Vac,200Hz,2 kw 3 phase signals to drive the induction motor (open-loop) .

THE CIRCUIT

PIC VOLTAGE

SUPPLIES

OPTICAL

INTERFACE DRIVER

H/W S/W DC

RECTIFIER1

DC

RECTIFIER2

DC

RECTIFIER3

DRIVING AN AC INDUCTION MOTOR

DC VOLTAGE MOTOR

AC line

Voltage

PWM Signals

(6 Signals)

Principle Schematic System Concept

Rectıfier Driver

Control Circuit

Pulse Width Modulation

From developed simple pwm signal software, upper and lower switch of pwm simulations are obtained on digital oscilloscope as seen below;

6 PWM Signals

PWM1 PWM1 INVERSE PWM2 PWM2 INVERSE PWM3 PWM3 INVERSE

PWM signals will be generated by a software we develop on the PIC 18f4431

After these 6 signals are generated we supply them to the optocoupler to seperate to low voltage power from the high voltage (power) part.

We decide to use a motor driver of the type IRAM 136-3023B i motion series

In the inpot side we build 3 rectifiers to obtain 3 different DC voltages with separate grounds.

PROJECT TIME PLAN

15 Oct-15 Dec 2011 -Develop the PWM signal on PIC.

15 Dec-21 Dec 2011 -Test the PWM signals at lab.

15 Oct-01 March 2012 -Developing rectifiers.

21 Dec-01 March 2012 -Connect the low voltage part with high voltage part.

01 March-15 March 2012 -Test the circuit with power part at lab with motor.

01 March-15 March 2012 -Integrate the rectifier with the part of the circuit.

15 March-30 March 2012 -Test the full circuit at lab.

01Apr-30 May 2012 -Manufacture the PCBS and box.

01 May-30 May 2012 -Test the device on the field.