Stepper(Rajvardhan Jaideva)

8/13/2019 Stepper(Rajvardhan Jaideva)

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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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2 2

1

N

S

1

S

N

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.html


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hankYou

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Stepper(Rajvardhan Jaideva)