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1. AC MOTOR DRIVE USING IGBT
OBJECTIVE:
The aim of the project is to develop a speed control
system for ac motor. It is proposed to include the start. Over-head
no-volt protection also.
PRINCIPLE:
Since the speed of AC motor depends on stator-applied
voltage. the speed can varied by varying stator voltage. but if
voltage is varied by keeping the frequency constant, the flux of the
machine will also vary. which is undesirable. It can be operated
constant flux condition.
TEAM DESCRIPTION:
The functional block diagram of AC motor speed
control system is shown in fig.1.
The controlled rectifier is a 3-phase half controlled
bridge rectifier constructed using SCRs and Diodes .the controlled
is used to obtain variable DC supply voltage. the variable DC
supply voltage is converted to 3 phase AC supply using else
IGBT.
The speed adjust circuitry will firing angles of
rectifier and rectifier and inverter to achieve the desired speed
=desired transformer(CT’s)are provided to sense the over-load or
no-volt condition and the firing pulses.

2. FEACTURES:
1. No need of extra starter.
2. soft start (while starting the current will not exceed the full
load current)
3. consonant speeds or constant torque operation.
4. over-load and no-volt protection.

3. Block Diagram
3 phase input(R,Y,B)
3 phase Rectifier
Soft Start Switch
(RELAY
CONTROL)
Microcontroller
PIC16F877
Current
Amplifier PWM
IGBT(INSULATED
GATE BIPOLAR
TRANSISTOR)
SPEED
AC Motor SENSOR-
PROXIMITY