Post on 03-Jun-2018
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Seminar on
Stepper Motors
Presentation by-
Rajvardhan Jaideva
0012ME13ME15( M.E.)
1st sem A.P.S.
Dept of Mech eng.
NITTTR Bhopal
Guided by
Dr. Vandana Somkuwar
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Content
1. Motor selection
2. Types
3. Stepper Motor
4. Cross section
5. Operation
6. Advantages
7. Application8. References
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Choosing a Motor
There are numerous ways to design a motor,thus there are many different types of motors.
The type of motor chosen for an application
depends on the characteristics needed in thatapplication.
These include:
How fast you want the object to move, The weight, size of the object to be moved,
The cost and size of the motor,
The accuracy of position or speed control needed.
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Types of Motors
The different types of motors possess differentoperating characteristics.
Heavy Industrial applications: AC motors
Mobile robotics & hobby robots: dc motor, dc servo motor,and stepper motors
Brief overview of the operation characteristics of: AC motors
DC motors DC servo motors
Stepper motors
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Stepper MotorsRequires a separate controller circuitry or it will
not turn when power is applied.
Inexpensive and commonly available, especially in
salvaged computer equipment
Precise positioning is possible by keeping count of
steps requested, even without feedback.
Torque is highest at the full stop and decreases as
speed is increased. If the applied load is greater than the capacity of
the motor, the motor may not step, thereby
making precise positioning no longer possible.
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Cross Section of a Stepper Motor
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Stepper Motor Operation A stepper motor consists of:
A permanent magnet rotating shaft (or rotor)
Electromagnets on the statorthe stationary portion thatsurrounds the motor
The stepper motor moves as the permanent rotor magnetattempts to line up with the poles of the electromagnets onthe stator.
The electromagnets are digitally switched to change theirpole orientation, which when done in a sequence producescontinuous rotation of the rotor, or can be controlled togive precise rotation to a desired angular position.
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The smallest step of angular rotation a stepper
motor can make is called its resolution.
Unlike the example, which had 90 degrees per
step resolution, real motors employ a series of
mini-poles on the stator and rotor to increaseresolution.
Surprisingly, the same sequence of the 4 steppingphases is used to control this scenario.
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Advantages of Stepper Motor
The DC motors on the TekBot offer limited speedcontrol and low torque.
The CEENBot uses a stepper motor for eachwheel.
The stepper motors on the CEENBot enablesaccurate wheel positioning with high holdingtorque and allows for open-loop speed control(wheel position feedback is not required).
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Stepping Motor to move read-write head
Stepper motor applications
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Stepper motors
Paper feeder on printers
CNC lathes
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The Difference Between Stepper Motors, Servos, andRC Servos by Roger Arrickhttp://www.arrickrobotics.com/motors.html
How Stepper Motors Work by Images Scientific
Instrumentshttp://www.imagesco.com/articles/picstepper/02.html
CEENBot Stepper Motor & PM DC Motor Testing UnitOperations Manual by Ben Barenz, CEEN Student
Hansen Corp. Servo motors http://www.hansen-motor.com/servo-motors.htm
Animated operation of a Unipolar stepper motor:http://www.interq.or.jp/japan/se-inoue/e_step1.htm
References
http://www.arrickrobotics.com/motors.htmlhttp://www.imagesco.com/articles/picstepper/02.htmlhttp://www.hansen-motor.com/servo-motors.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.interq.or.jp/japan/se-inoue/e_step1.htmhttp://www.interq.or.jp/japan/se-inoue/e_step1.htmhttp://www.interq.or.jp/japan/se-inoue/e_step1.htmhttp://www.interq.or.jp/japan/se-inoue/e_step1.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.hansen-motor.com/servo-motors.htmhttp://www.imagesco.com/articles/picstepper/02.htmlhttp://www.arrickrobotics.com/motors.html8/13/2019 Stepper(Rajvardhan Jaideva)
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hankYou