STEPPER MOTOR A stepper motor is a pulse- driven motor that
changes the angular position of the rotor in steps
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TYPES OF STEPPER MOTOR VARIABLE RELUCTANCE STEPPER MOTOR
PERMANENT MAGNET STEPPER MOTOR HYBRID STEPPER MOTOR
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VR STEPPER MOTOR
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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
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Modes of operation VR type 1-phase ON full step operation
2-phase ON Half-step alternate 1-phase & 2-phase mode Micro
stepping
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1-PHASE ON FULL STEP OPERATION
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2-PHASE ON MODE
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HALF-STEP ALTERNATE 1-PHASE & 2-PHASE MODE
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HALF STEP OPERATION
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VR MULTI STACK
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Stepangle = ((Ns-Nr)/Ns*Nr) *360= 360/m*Nr N s No. of Stator
poles (teeth) N r No. of Rotor poles (teeth) m - No. of stator
phases Resolution = No. of steps/revolution = 360 o /