eee499,graduation projects

1. An-Najah National UniversityAn-Najah National University
Faculty Of EngineeringFaculty Of Engineering
Electrical Engineering DepartmentElectrical Engineering Department

5. THE MOTOR WE
USED
A run-type capacitor
permanently connected
in series with the start
(Aux.) winding.
It provides the 90
degree phase shift
between main & aux.
This 90 degree will be
done by programming.

6. Measured motor SpecificationsMeasured motor Specifications

9.  Unfortunately, all of
these components
increase the cost of
the system for basic ON
and OFF control in two
directions.

13. Constant V/F resulting the motors to produce their rated torque over the widest
possible speed range.

15. DESIGN DESCRIPTIONDESIGN DESCRIPTION

18. FULL CIRCUITFULL CIRCUIT
PREVIEWPREVIEW

19. HardwareHardware
DesignDesign

20. PIC MICROCONTROLLERPIC MICROCONTROLLER
BASIC CCTBASIC CCT
KEYPAD + LCD CONNECTIONKEYPAD + LCD CONNECTION

23. Dead Band Time CCTDead Band Time CCT

24. GATEGATE DRIVERDRIVER

26. AC inverters are used to convert DC voltage to AC voltage to feed the
motor under control.
It is used to vary the frequency.
Also it will be the main element in direction control of the motor.

30.  The winding voltages, Va, Vb, and Vc, should be
controlled to achieve the phase difference between the
effective voltages across the main and starting windings,
in order to have a 90-degree phase shift to each other.

32. SoftwareSoftware
DesignDesign

34. To achieve 90º between main
& aux:
* Semi sinusoidal
waveforms.
* Nearly high frequency
(around 7 KHz was used).

35. *R-C (low pass) filter used to see the wave*R-C (low pass) filter used to see the wave
**PWM2 signal is the same but with 90º phase shift (±0x4000,PWM2 signal is the same but with 90º phase shift (±0x4000,
according to the direction of rotation)according to the direction of rotation)

37. YES
33
NO
22

42. Splitting grounds of low&high sidesSplitting grounds of low&high sides
Auxiliary power supplyAuxiliary power supply
Not enough to trigger the gate.Not enough to trigger the gate.
Switching FrequencySwitching Frequency