Speed Control of Single Phase Induction Motor using Node MCU – Hardware Design

Abstract:

This project is used to control the induction motor by using a Node MCU controller. The single-phase inverter converts dc voltage into ac voltage. Single-phase induction motor speed depends on the frequency of the inverter. The inverter card comes with an inbuilt full bridge rectifier and filter capacitor. 4 No’s of IRFP250 MOSFETs are mounted with a Heat sink. The output of the inverter is terminated with a 2-pin PTB Connector. The user should get soldered on the backside of the board for the gate pulse interface.

?4 No’s of IRFP250 MOSFET are mounted with proper Heat sink

?5A Bridge Rectifier with DC Filter Capacitor (1000uF/250V)

?2 Pin PTB Connector provided to connect Motor

?4?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

TLP 250 DRIVER BOARD:

Specification?

?4 No’s Opto-Isolated Gate Drive

?Input Voltage 12V/AC/50Hz

?Operating Frequency 25 kHz

?All input and outputs are terminated with RMC Male Connectors

Block Diagram:

Block Diagram Explanation:

• Pulse generator:? Here we have used a PIC microcontroller (PIC 16F877a) to generate a PWM signal.
• Driver circuit: It is used to amplify the pulses and provided isolations using an optocoupler. It has two functions,
  • Amplification
  • Isolation
• Bridge Rectifier: It converts AC supply to DC Supply.
• Single-phase Inverter: It converts the DC supply to a single-phase AC Supply to drive the single-phase induction motor.

Inverter Output Waveform

Webpage Output?