1.
A Case Study on
CASE STUDY ON STEPPER MOTOR
Presentation by:
Ravada Tarun Kumar (17981A04I2)
Thadi Prem Kumar (17981A04K4)
Bikkina Mahesh (18985A0428)
S Dileep Kumar (17981A04I7)
Department of Electronics & Communication Engineering
RAGHU ENGINEERING COLLEGE
Visakhapatnam-531162 1

2.
Question
 Design the stepper motor interfacing with 8086 using the
following specifications
 A) Identify the components required for the application
 B) Give the design (Block diagram and schematic diagrams)
 C) Develop the program using 8086 assembly language
 D) Show the output using Kit/Simulation tool
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3.
Contents
 Stepper motor
 Stepper motor windings
 Winding arrangement
 Protection of winding
 Stepper motor design
 Interfacing program
 Hardware circuit
 Conclusion
 References
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4.
Stepper motor
 It is a device used to obtain an accurate position control of
rotating shaft.
 The rotation of the shaft will be in the terms of steps.
 To rotate the shaft of the stepper motor, a sequence of pulses
is needed to be applied to the winding of the stepper motor,
in proper sequence.
 The number of pulses required for one complete rotation of
the shaft of the stepper motor are equal to its number of
internal teeth on rotor.
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5.
Stepper motor
 The stator teeth and rotor teeth lock with each other to fix a
position of the shaft.
 With pulse applied to the winding input, the rotor rotates by
one teeth position or an angle ‘x’.
 The angle ‘x’ may be calculated
X = 360 degrees
No.of rotor teeth
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6.
Stepper motor
 The typical stepper may have parameters like torque 3kg-cm,
operating voltage 12v, current rating 0.2A and a step angle 1.8
degrees.
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7.
Stepper motor windings
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8.
Stepper motor rotor
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9.
Winding arrangement
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10.
Protection of winding
 We have to protect the winding of stepper motor.
 Parallel to the winding ‘a’, they connected a diode.
 When the excess currents flows through that winding then
that diode will break down and the large current will flow
through that diode and that winding ‘a’ will be protected.
 The reason is that the current will always offer a low
resistance path.
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11.
Protection of winding
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12.
Stepper motor design
 We are going to design a stepper motor controller and writing
a ALP to rotate shaft of a 4-phase stepper motor. In clock 5
rotations and in anticlockwise 5 rotations.
Motion step A B C D
clockwise 1 1 0 0 0
2 0 1 0 0
3 0 0 1 0
4 0 0 0 1
5 1 0 0 0
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Stepper motor design
Motion step A B C D
Anticlockwise 1 1 0 0 0
2 0 0 0 1
3 0 0 1 0
4 0 1 0 0
5 1 0 0 0
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14.
Interfacing program
ASSUME CS : CODE
CODE SEGMENT
START: MOV AL,80H
OUT CWR,AL
MOV AL,88H
MOV CX,1000
AGAIN1: OUT PORT A,AL
CALL DELAY
ROL AL,01
DEC CX
JNZ AGAIN1
MOV AH,88H
MOV CX,1000
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15.
Interfacing program
AGAIN2: OUT PORT A,AL
CALL DELAY
ROR AL,01
DEC CX
JNZ AGAIN2
MOV AH, 4CH
INT 21H
CODE ENDS
END START
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16.
Hardware circuit
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17.
Conclusion
 In this way we can Design a stepper motor interfacing
with 8086 using the following specifications
 A) Identify the components required for the application
 B) Give the design (Block diagram and schematic
diagrams)
 C) Develop the program using 8086 assembly language
 D) Show the output using Kit/Simulation tool
17

18.
References
 https://www.google.com/search?q=steppermotor&aps+chro
me..69i57j0I3.1323j0j7&client=ms-android-
vivo&sourceid=chrome-mobile&ie=UTF-8
 https://www.google.com/search?q=intefacing&aps+chrome..
69i57j0I3.1323j0j7&client=ms-android-
vivo&sourceid=chrome-mobile&ie=UTF-8
 https://www.google.com/search?q=simulation
techniques&aps+chrome..69i57j0I3.1323j0j7&client=ms-
android-vivo&sourceid=chrome-mobile&ie=UTF-8
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THANK YOU
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