Three Phase Induction Motor Speed Control using dSPIC Controller

Description

INTRODUCTION

This project describes the speed control of the Induction motor with the dSPIC Controller (dsPIC30F4011 Digital Signal Controller) By comparing the sine and triangular wave (internal) dsPIC30F4011 generates the controlled switching pulses for the inverter. The speed control is done by changing the frequency of reference sine and amplitude of sine from dsPIC30F4011. The motor speed is measured by using the proximity sensor placed on the Induction Motor and displayed on LCD.

HARDWARE BLOCK DIAGRAM

In this project, the Three Phase Induction Motor is controlled by the dsPIC Controller (30F4011). The Induction Motor power is converted from AC and Full wave rectifier. The 3Ph Inverter circuit formed using IRFP250 MOSFET and its gate is driven by TLP250 with a separate isolator for TOP and BOTTOM MOSFET from dsPIC30F4011. The speed of induction motor speed is sensed by the Proximity sensor

BLOCK DIAGRAM

Details for H-Bridge 3 Phase Inverter Card 

The inverter card comes with an inbuilt full bridge rectifier and filter capacitor. 6 Nos of IRFP250 MOSFETs are mounted with a Heat sink. The output of the inverter is terminated with a 3 pin PTB Connector. The user should get soldered on the backside of the board for the gate pulse interface.

• 6 No’s of IRFP250 MOSFET are mounted with proper Heat sink
• 5A Bridge Rectifier with DC Filter Capacitor(1000uF/250V)
• 3 Pin PTB Connector provided to connect Motor

3 PHASE H-BRIDGE INVERTER (MOSFET/IGBT) BOARD

INVERTER BOARD

SPECIFICATION

• 6  No’s of IRFP250 MOSFET with Heat sink
• Input Voltage 100V/AC/50Hz
• Operating Frequency 25 kHz
• Input and Outputs are terminated with PTB Connectors

dSPIC Controller

BLOCK DIAGRAM OF INDUCTION MOTOR SPEED CONTROL TECHNIQUE

STEPS TO CHECK INDUCTION MOTOR SPEED CONTROL DEMO

1. Connect Proximity Sensor to 6^th Pin in Dspic30f4011 Kit.
2. Connect Pulses to Driver board correspondingly.
3. Connect 6 PWM Output Signal from Driver board to Inverter Drive.
4. Download 3Ph inverter.hex file to dsPIC30F4011 controller using MPLAB Software.
5. Press the key to vary the speed of the motor.
6. Read the motor speed in RPM in the LCD Display.