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STEPPER MOTOR

STEPPER MOTOR. J. Belwin Edward Assistant Professor Senior School of Electrical Engineering VIT University Vellore. Applications. Computer peripherals Textile industries IC fabrications Robotics Applications requiring incremental motion Typewriters Line printers Tapedrives

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STEPPER MOTOR

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  1. STEPPER MOTOR J. Belwin Edward Assistant Professor Senior School of Electrical Engineering VIT University Vellore

  2. Applications Computer peripherals Textile industries IC fabrications Robotics Applications requiring incremental motion Typewriters Line printers Tapedrives Floppy disk drives Numerically-controlled machine tools Process control systems X-Y plotters

  3. Applications contd…. • Commercial, military and medical applications • Mixing, cutting, striking, metering, blending • Application in manufacture of packed food stuffs • Application in manufacturing of commercial end products • Production of science fiction movies.

  4. Step Angle - β • As small as 0.78o to 90o • Most commonly used – 1.8o, 2.5o, 7.5o, 15o β = (Ns-Nr) x 360o = 360o Ns.Nr mNr Ns – No. of Stator poles (teeth) Nr – No. of Rotor poles (teeth) m - No. of stator phases

  5. Resolution • Resolution = No. of steps/revolution = 360o/β

  6. Types • Variable Reluctance - VR • Permanent Magnet - PM • Hybrid

  7. VR, PM and Hybrid types

  8. Variable Reluctance ( VR) stepper motor • Wound Stator poles • Single Stack • Multiple Stack – smaller step angle • Rotor poles – ferromagnetic material • Direction – stator current polarity • Reluctance of the magnetic circuit formed by rotor and stator teeth varies with angular position of the rotor

  9. Variable Reluctance stepper motor Single Stack

  10. VR – Multi stack

  11. VR-Operation

  12. Modes of operation –VR type • 1-phase ON – full step operation • 2-phase ON • Half-step – alternate 1-phase & 2-phase mode • Micro stepping

  13. 2-phase ON mode

  14. Half step mode

  15. Half step operation

  16. Permanent Magnet (PM) Stepper Motor

  17. Permanent Magnet stepper motor • Wound Stator poles • Single Stack • Multiple Stack – smaller step angle • Rotor poles – permanent magnet • Rotor Shape - Cylindrical • Direction – stator current polarity

  18. PM - operation

  19. PM - operation

  20. Modes of Operation – PM type • 1-phase ON mode • 2-phase ON mode • Half step mode

  21. Modes of Operation – PM type

  22. Hybrid Stepper Motor

  23. Hybrid stepper motor • Combination of VR and PM • Wound Stator poles – (similar to VR) • Single Stack • Multiple Stack – smaller step angle • Rotor poles – permanent magnet • Rotor shape – not Cylindrical • Direction – stator current polarity

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