Flowers

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WINTER
An-Najah National University Faculty of
EngineeringElectrical Engineering
Department Introduction in Graduation
project Variable speed control of single phase
Induction motor
Template
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Prepared By Ala' Mohammad Radwan Saleh Ala'
Mohammad MareeSawsan Wahid Alhaj As'ad
Submitted To Dr. Kamel Saleh
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Contents
Principle of Operation of Induction Motor.
Modelling of Single Phase Induction Motor
H-Bridge Inverter.
VF Control.
Results.
Future Work.
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Variable Speed Control of Single Phase Induction
Motor
Objectives

• To make simulation includes modelling of single
  phase induction motor, H-bridge inverter, PWM
  generator, and presenting the experimental
  results.
• To build a variable speed drive of the single
  phase induction motor using frequency control
  method.

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Principle of Operation of Induction Motor

• In principle of operation of induction motor,
  rotating magnetic field rotates at synchronous
  speed interacts with rotor , this will produce
  torque that will make the rotor rotates at
  mechanical speed.
• In three-phase induction motor, the rotating
  magnetic field is generated by applying three
  currents shifted by 120 degrees to three windings
  also shifted by 120 degrees.
• In single-phase induction motor, there are many
  types based on method of starting, these types
  are

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Principle of Operation of Induction Motor
Split-phase induction motor.
 
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Capacitor start induction motor.
 
Permanent-split capacitor motor.
In this type the auxiliary winding and the
capacitor are connected from the motor after
starting
Capacitor start capacitor run motor.
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In this type two capacitors are used with the
auxiliary winding, one for starting and the other
during start and run.
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Principle of Operation of Induction Motor

• In most of these types the rotating magnetic
  field is generated by applying two currents
  shifted by some angle(using capacitor) to main
  and auxiliary windings.
• In our project, the rotating magnetic field is
  produced by applying two currents shifted by 90
  degrees exactly to auxiliary and main windings
  using inverter. This two currents are shifted
  without using capacitor. So we can use any of
  previous types but without capacitor.

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Modelling of Single Phase Induction Motor

• Single-phase induction motors with main and
  auxiliary winding can be viewed as two-phase
  machines.
• Therefore, two-phase induction motors have a
  configuration identical to single-phase induction
  motors, but a two-phase voltage is supplied to
  the stator windings terminal.
• So, modeling of single phase induction motor can
  be done as the following

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Mathematical Model
Equivalent circuit of two phase induction motor.
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Mathematical Model

•  

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Mathematical Model

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Modeling Using Matlab/Simulink
 
Model of induction motor.
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H-Bridge Inverter

• H-bride inverter is used to control the direction
  of rotation of induction motor. The following
  figure shows the H-bridge inverter.
• To feed H-bridge inverter by four pulses signal,
  PWM technique was used.

H-Bridge inverter.
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PWM Technique

• In PWM technique, an input analog signal (carrier
  signal) and a saw tooth waveform (modulating
  signal) are driven in a comparator. Each time saw
  tooth waveform voltage is less than the input
  signal, the PWM output is driven high and
  vice-versa.
• The following Figure shows the PWM technique.

PWM Technique.
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PWM Technique

• PWM technique was simulated using Matlap/Simulink
  as shown in the following figure.

PWM generator using Matlap/Simulink.
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PWM Technique

• The H-bridge inverter and the PWM generator were
  connected as shown in the following figure.

PWM generator H-bridge inverter.
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PWM Technique

• The following figure shows the output of PWM
  generator and H-bridge inverter a reference speed
  of 1000r.p.m was interred to PWM generator.

PWM0, PWM1, PWM2, and PWM3 signals.
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PWM Technique
Outputs of H-bridge inverter.
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PWM Technique

• The PWM generator and the H-bridge inverter were
  connected to the induction motor model as shown
  in the following figure.

Model of variable speed control of single phase
induction motor.
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VF Control

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VF Control

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Results
 
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Outputs of PWM generator (PWM0, PWM1, PWM2 and
PWM3).
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• Second Test
• The reference speed is a step with step time
  2s, initial value 0 and final value
  2000r.p.m, with a step load (step time 1s,
  initial value 0 and final value 10N.m).
• The following figure shows the measured speed.

 
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•  

 
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• Fourth Test
• The reference speed is a step with step time
  2s, initial value 0 and final value
  3000r.p.m, with a step load (step time 3s,
  initial value 0 and final value 5N.m).
• The following figure shows the measured speed.

 
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Future Work

• The following figure shows how the project will
  be built.

Single phase induction motor drive with H-bridge
inverter.
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Future Work
The following figure shows the data sheet of
PIC16F877 microchip which will be used to
generate the PWM signals needed. Pin 16 and pin
17 are the pins that generate PWMs.
Data sheet of PIC16F877
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Future Work

• The following figure shows the typical connection
  of gate drive, which will be used to convert the
  voltage from 0-5V to 0-15V.

Typical connection of the gate drive.
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Future Work
Reference Speed
0-5V
0-15V
-300-300V
PIC 16F877 Microchip
Induction Motor
Gate Drive
H-Bridge Inverter
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Thank you