STEPPER MOTOR J. Belwin Edward Assistant Professor Senior

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Presentation transcript:

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 Floppy disk drives Numerically-controlled machine tools Process control systems X-Y plotters

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.

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

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

Types Variable Reluctance - VR Permanent Magnet - PM Hybrid

VR, PM and Hybrid types

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

Variable Reluctance stepper motor Single Stack

VR – Multi stack

VR-Operation

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

2-phase ON mode

Half step mode

Half step operation

Permanent Magnet (PM) Stepper Motor

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

PM - operation

PM - operation

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

Modes of Operation – PM type

Hybrid Stepper Motor

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