►Introduction

This section of tutorial will explain you everything that you need to know about stepper motors. Stepper motors can be used in various areas of your microcontroller projects such as making robots, robotic arm, automatic door lock system etc. This tutorial will explain you construction of stepper motors (unipolar and bipolar stepper motors ), basic pricipal, different controlling types (Half step and Full step), Interfacing Techniques (using L293D or ULN2003) and programming your microcontroller in C and assembly to control stepper motor.


Unipolar stepper motor
The unipolar stepper motor has five or six wires and four coils (actually two coils divided by center connections on each coil). The center connections of the coils are tied together and used as the power connection. They are called unipolar steppers because power always comes in on this one pole.


Bipolar stepper motor
The bipolar stepper motor usually has four wires coming out of it. Unlike unipolar steppers, bipolar steppers have no common center connection. They have two independent sets of coils instead. You can distinguish them from unipolar steppers by measuring the resistance between the wires. You should find two pairs of wires with equal resistance. If you've got the leads of your meter connected to two wires that are not connected (i.e. not attached to the same coil), you should see infinite resistance (or no continuity).




As already said, we will talk mostly on "Unipolar stepper motors" which is most common type of stepper motor available in the market.A simple example of 6 lead step motor is given below and in 5 lead step motor wire 5 and 6 are joined together to make 1 wire as common.


Unipolar stepper motor coils


►Working of Stepper Motor

Now lets discuss the operation pricipal of a stepper motor. When we energize a coil of stepper motor, The shaft of stepper motor (which is actually a permanent magnet) align itself according to poles of energized coil. So when motor coils are energized in a particular sequence, motor shaft tend to align itself according to pole of coils and hence rotates. A small example of energizing operation is given below.

working principal of stepper motor


You can see in the example, when coil "A" is energized, A north-south polarity is generated at "A+A\" as shown in the figure above and magnetic shaft automatically align itself according to the poles generated. When the next coil is energized the shaft again align itself and take a step. Hence the working pricipal.

working principal of stepper motor


We have seen that to make the stepper motor work, we need to energize coil in a sqeuence. The explaination and generation of the sequence is explaind in the next section of the tutorial.


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DC Motor Tutorial Index
Introduction to Stepper Motors
Stepper Motor Connections
Step Sequence of Stepper Motors
Programming for Stepper Motor
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Posted By pravin_35
Tue Jul 29 2014, 06:00 AM
Fyiimage with connections
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Posted By pravin_35
Tue Jul 29 2014, 05:53 AM
another chip is also same problem... i am confused...
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Posted By pravin_35
Tue Jul 29 2014, 01:41 AM
hi guys i found the following link is very useful...
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Posted By ExperimenterUK
Mon Jul 28 2014, 11:17 PM
Link the tx and rx pins on HC06, everything you se...
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Posted By ExperimenterUK
Mon Jul 28 2014, 11:13 PM
another chip is also same problem... i am confused...
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Posted By pravin_35
Mon Jul 28 2014, 01:33 PM
I suggest you to try with another chip of same and...
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Posted By pravin_35
Mon Jul 28 2014, 05:29 AM
I suggest you to try with another chip of same and...
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Posted By ajay_bhargav
Mon Jul 28 2014, 03:23 AM
I suggest you to try with another chip of same and...
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Posted By pravin_35
Mon Jul 28 2014, 03:11 AM
just now tried with Mplabx screen shotpravin_35Are...
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Posted By ajay_bhargav
Mon Jul 28 2014, 02:45 AM
just now tried with Mplabx screen shotpravin_35Are...

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ajay_bhargav
Mon Jul 28 2014, 12:34 AM
@ Anshu Raj sorry we do not take such requests.
Sun Jul 27 2014, 12:23 AM
Anshu Raj
sir plz send the automatic collage alram bells in 2 hrs bells ring. For microcontroller programme plz sir
ajay_bhargav
Thu Jul 24 2014, 01:06 AM
@R.ABHISHEK where? I dont see it. is it in forum?
Wed Jul 23 2014, 05:49 AM
R.ABHISHEK
sir,pls message on microcontroller 8051 assambly language new program
Wed Jul 23 2014, 05:47 AM
R.ABHISHEK
sir,pls message on 8051 microcontroller assambly language program new quastions
ajay_bhargav
Tue Jul 22 2014, 09:18 AM
@Pragya Android application is taken from google play. Only Author has its source with him. Application is only used in this project.
Tue Jul 22 2014, 04:58 AM
Pragya
plz send me 8051 code and android code for android based device controller via Bluetooth .Here in this project I am using Hc-06 Bluetooth module
Thu Jul 10 2014, 09:57 AM
Caleb
plz someone mail me the source code for that project
Thu Jul 10 2014, 09:57 AM
Caleb
http://www.8051projects.net/download-d188-control-your-pc-tv-remote.html
ExperimenterUK
Tue Jul 08 2014, 03:25 PM
Post questions in the forum.. this area is for chat

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