Three phase-induction-motor(eee499.blospot.com)

Three phase-induction-motor(eee499.blospot.com)

• 1.
  Al-Najah National UniversityAl-NajahNational University Electrical Engineering DepartmentElectrical Engineering DepartmentElectrical Engineering DepartmentElectrical Engineering Department Speed Drive For Three-Phase Induction MotorSpeed Drive For Three-Phase Induction Motor PresentationPresentation By Eng.Mu’taz S. Al-Sheikh & Eng.Khalid Hammoudeh Supervisor Prof . Dr . Marwan Mahmmod
• 2.
  NNsynsyn = 120f / P= 120 f / PNNsynsyn = 120 f / P= 120 f / P Changing number of poles (P) :  Methods for drive speed of IM :Methods for drive speed of IM : This method requires a motor with special stator winding Changing line frequency (f) : Changing in (f) is affect in magnetization current & flux Ф α 1/f Changing line voltage (v): Changing in (v) is affect in magnetization current & flux Ф α v
• 3.
  The perfect methodfor drive is :The perfect method for drive is :The perfect method for drive is :The perfect method for drive is :  Methods for drive speed of IM :Methods for drive speed of IM : Changing line voltage proportional to frequency The ratio V / f constant. The advantages of this method clearly in:  The flux (Ф) remains constant.  The torque remains constant at any speed under the rated speed.  Note that : this project use the fourth method for controlling under rated speed.
• 4.
  Characteristic curve forV/f constant :Characteristic curve for V/f constant :Characteristic curve for V/f constant :Characteristic curve for V/f constant :  Methods for drive speed of IM :Methods for drive speed of IM :
• 5.
  The general categoriesof (VSI) inverter:The general categories of (VSI) inverter:The general categories of (VSI) inverter:The general categories of (VSI) inverter: Square wave inverter :  Voltage source inverter (VSI) :Voltage source inverter (VSI) : The DC voltage Is controlled in order to control the magnitude of the AC output voltage and the inverter control the frequency. The output voltage is a square wave voltage.
• 6.
   Voltage sourceinverter (VSI) :Voltage source inverter (VSI) :  Pulse width modulation inverter (PWM) : The DC voltage Is constant and the inverter control the magnitude of the AC output voltage and the frequency. The behavior of one leg inverter. To obtain any desired frequency , a sinusoidal control signal at desired frequency compared with a triangle wave . Vcont > Vtri T+ IS ON Vcont < Vtri T- IS ON
• 7.
  The control wave& output wave form for three leg (PWM):The control wave & output wave form for three leg (PWM):
• 8.
  Three-phase pulse widthmodulation :Three-phase pulse width modulation :  It is contain from three leg inverter .  Full power circuit for three phase IM drive .
• 9.
  PIN CONFIGURATION FORTHE CHIP :PIN CONFIGURATION FOR THE CHIP :PIN CONFIGURATION FOR THE CHIP :PIN CONFIGURATION FOR THE CHIP : PWM generation chip (HEF-4752V)PWM generation chip (HEF-4752V)
• 10.
   Information ofthe pins :Information of the pins : Pin 8 : drive signal for upper switching device for R-phase Pin 9 : drive signal for lower switching device for R-phase Pin 22 : drive signal for upper switching device for S- phase Pin 21 : drive signal for lower switching device for S-phase Pin 3 : drive signal for upper switching device for T-phase Pin 2 : drive signal for lower switching device for T-phase Pin 25: for determine the drive signal are in thyristor or transistor mode Pin 24 : stop /start signal Pin 7 : for the delay time Pin 5 : for the reversing direction
• 11.
  Information of pinsInformationof pins Pin 12 : to control the inverter output frequency (f p12 = 3360*f0) Pin 17 : control the output voltage of inverter Pin 4 : setting for inverter switching frequency
• 12.
  Project Block Diagram:Project Block Diagram :Project Block Diagram :Project Block Diagram : PWM Inverter (sequence of operation) :PWM Inverter (sequence of operation) :
• 13.
   Control Circuitof Project :Control Circuit of Project :
• 14.
  1. fFCT =100 - 220 KHz ( results in varying output frequency from 30 to 85 Hz ) 2. fVCT = 300 KHz (results in obtaining V/f constant up to f01 =50 Hz). 3. fOCT = 560KHZ (results in delay between the upper and lower transistor operation = 0.0285 ms ). 4. fRCT = 560KHz (results in the maximum switching frequency = 2KHz ) Setting for Data Input :Setting for Data Input :
• 15.
   Isolator &Driver Circuit :Isolator & Driver Circuit :
• 16.
  The Results :TheResults : • The minimum output frequency set to be 30Hz and the wave form of VRY is shown in fig • The maximum output frequency set to be 85Hz and the wave form of VRY is shown in fig.
• 17.
  The Results :TheResults : • The 120˚ phase shift between R,Y phases :
• 18.
   Inverter Usein Project :Inverter Use in Project :
• 19.
  V / F= Constant , Showing in the table belowV / F = Constant , Showing in the table belowV / F = Constant , Showing in the table belowV / F = Constant , Showing in the table below Measurements :Measurements : VoltageVoltageVoltageVoltage V / F ratioV / F ratioV / F ratioV / F ratioFrequencyFrequencyFrequencyFrequency 14141414 0.470.470.470.4730303030 16161616 0.460.460.460.4635353535 19191919 0.470.470.470.4740404040 20202020 0.40.40.40.450505050 20202020 ……………………50-8550-8550-8550-85
• 20.
  Thank you