1. UNIT-5 SPECIAL MACHINE DRIVES SWITCHED RELUTANCE MOTOR DRIVE
BLDC MOTOR DRIVE
STEPPER MOTOR DRIVE
SWITCHED RELUTANCE MOTOR DRIVE

2. STEPPER MOTOR
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3. STEP ANGLE
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4. RESOLUTION & STEPPING ERROR
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5. POSITION ACCURACY
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6. MOTOR SPEED
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10. CLASSIFICATION OF STEPPER MOTOR
PM STEPPER MOTOR
VR STEPPER MOTOR
HYBRID MOTOR
TYPES OF STEPPER MOTOR
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11. VARIABLE RELUCTANCE MOTOR PERMANENT MAGNET STEPPER MOTOR HYBRID MOTOR
ONLY THE STATOR HAS THE WINDINGS
THERE IS NO WINDING IN ROTOR
THE ROTOR HAS FERROMAGNETIC POLE
THE ROTOR HAS SALIENT POLES
PERMANENT MAGNET STEPPER MOTOR
THE ROTOR HAS THE PERMANENT MAGNET
THE ROTOR HAS PROJECTIVE POLES
HYBRID MOTOR
THIS MOTOR HAVING THE FEATURES OF VR STEPPER MOTOR &PM STEPPER MOTOR
THERE NO WINDINGS IN ROTOR
THE ROTOR HAS PERMANENT MAGNET& SALIENT POLE
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12. OPERATION MODES OF VR STEPPER MOTOR
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13. 1-PHASE ON OPERATION
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14. SWITCHING SEQUENCES
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15. 2-PHASE ON OPERATION
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16. SWITCHING SEQUENCES
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17. ALTERNATE 1-PHASE & 2-PHASE ON
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18. SWITCHING SEQUENCES
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19. 4.MICRO STEPPING (MULTISTACK)
The micro stepping process only available in the multi stack variable reluctance motor
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20. 4.MICRO STEPPING
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22. MODES OF OPERATION OF PERMANENT MAGNET STEPPER MOTOR
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23. SWITCHING SEQUENCES
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24. 2-PHASE ON MODE
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25. SWITCHING SEQUENCES
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26. ALTERNATE 1-PHASE & 2-PHASE ON
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27. SWITCHING SEQUENCES
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29. HYBRID MOTOR
The hybrid motor is combination of the VR stepper motor & PM stepper motor
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30. OPERATION
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35. CHARACTERISTICS OF DUAL VOLTAGE DRIVE
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CHARACTERISTICS OF DUAL VOLTAGE DRIVE

36. DUAL VOLTAGE DRIVE FOR 2-PHASE OPERATION MODE IN 4 PHASE MOTOR
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38. CHOPPER DRIVE CHARTERISTICS
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39. BIPOLAR DRIVES FOR STEPPER MOTOR
BASIC BIPOLAR DRIVES
IT CONSISTS 2 DIOES 2 TRANSISTERS &2 POWER SUPPLY
THERE IS NO WINDINGS
UNI POLAR POWER SUPPLY USED
BIPOLAR L/R DRIVES
IT CONSISTS 4 DIOES ,4 TRANSISTERS & 2 POWER SUPPLY
THERE ARE 2 WINDINGS
BIPOLAR CHOPPER DRIVES
IT CONSISTS 4 DIOES 4 TRANSISTERS & 2 POWER SUPPLY
BIPOLAR POWER SUPPLY USED
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40. BASIC BIPOLAR DEVICES V-SOURCE1 ACTIVE
NORMAL POSITION V-SOURCE1 ACTIVE
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41. BASIC BIPOLAR DEVICES FOR 2 PHASE ON MODE
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42. BIPOLAR L/R DRIVES WITH 2 VOLTAGE SOURCE
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43. BIPOLAR L/R DRIVES WITH SINGLE VOLTAGE SOURCE
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44. BIPOLAR CHOPPER DRIVES
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45. COMPARISION BETWEEN BIPOLAR & UNIPOLAR DRIVES
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47. Faraday’s law of electromagnetic induction
B-H CURVE
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48. FLUX LINKAGE
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50. CASE 1:Ө=45° CASE 3:Ө=90° CASE 1:Ө=0° AIRGAP IS SMALL
RELUTANCE IS MINIMUM
L IS MAXIMUM (LMAX)
CASE 1:Ө=0°
RELUTANCE IS INCREASED
L IS DECREASED
CASE 1:Ө=45°
AIRGAP IS LARGE
RELUTANCE IS MAXIMUM
L IS MINIMUM
CASE 3:Ө=90°
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51. INDUCTANCE PROPERTY OF SRM
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55. DRIVES FOR SRM
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63. Conventional DC Motor
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65. PERMANENT MAGNET DC MOTOR (SECOND STAGE EVOLUTION)
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66. PERMANENT MAGNET BRUSHLESS DC MOTOR (THIRD STAGE EVOLUTION)
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69. COMMUTATOR
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71. 180 POLEARC
120 POLEARC
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72. BLPM SNW MOTOR 3PHASE 3PULSE BLPM MOTOR
SIN WAVE FLUX WITH RESPECT TO STEP ANGLE
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73. OPERATION OF BLPM SNW MOTOR
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74. TORQUE EQUATION
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75. ONE PHASE WINDING –ONE PULSE BLPM DC MOTOR
ONE PHASE WINDING –TWO PULSE BLPM DC MOTOR
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Torque wave forms

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78. POWER CONTROLLER OF BLPM DC MOTOR
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