Stepper Motor

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Real Images

Used in CD-ROM Drive Used in Dot Matrix Printer

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Types of Stepper Motor

• Variable Reluctance SM• Permanent Magnet SM• Hybrid SM

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Variable Reluctance Stepper Motor

MODES OF OPERATION 1 Phase ON 2 Phase ON Half Step Operation Microstepping

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VRSM – 1 Phase ON Mode

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VRSM- 2 Phase ON Mode

2 stator energized simultaneously AB, BC, CA, AB Equilibrium position is in between

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VRSM – Half Step Operation

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VRSM- Microstepping

• 2 phase ON mode• 2 unequal current• Very fine Resolution• Used for smooth low speed operation with

high resolution

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Permanent Magnet Stepper Motor

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Hybrid Stepper Motor

APPLICATION

• Printers, Plotters• Robotics• Automotive• Commercial• Military• Medical Applications

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THANK YOU

References:Textbook of Electrical Technology, BL Theraja, AK Theraja; S Chand