Slide 1

STEPPER MOTOR A stepper motor is a pulse- driven motor that changes the angular position of the rotor in steps

Slide 2

TYPES OF STEPPER MOTOR VARIABLE RELUCTANCE STEPPER MOTOR PERMANENT MAGNET STEPPER MOTOR HYBRID STEPPER MOTOR

Slide 3

VR STEPPER MOTOR

Slide 4

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

Slide 5

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

Slide 6

1-PHASE ON FULL STEP OPERATION

Slide 7

2-PHASE ON MODE

Slide 8

HALF-STEP ALTERNATE 1-PHASE & 2-PHASE MODE

Slide 9

HALF STEP OPERATION

Slide 10

VR MULTI STACK

Slide 11

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 /

Slide 12

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