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Unipolar Vs Bipolar stepper motor


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marquessalsero



Joined: 16 Feb 2006
Posts: 3


Post17 Apr 2008 11:51   

unipolar vs bipolar stepper motor


I am starting with the design of a cnc milling machine but one of my problems is deciding the kind of stepper motor.

Should I use unipolar or Bipolar motors?

Can anyone give me a clue about advantages and disadvantages.

Thanks in advance
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nandhu015



Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India


Post17 Apr 2008 16:37   

unipolar bipolar stepper motor


marquessalsero

Unipolar basically has 4 windings and easy to drive and has low torque and speed.
While bipolar has 2 windings and hard to drive and has high torque and speed.

Think about using a servo for your project.

Regards
Nandhu
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marquessalsero



Joined: 16 Feb 2006
Posts: 3


Post17 Apr 2008 17:59   

unipolar and bipolar stepper motor


Thanks for your help.

I have been looking also to servo systems but are a lot more difficult for the first iteration ofthe project.

Most of the schematics I have seen fo stepper motor control are a lot more simpler.

So probably will go the bipolar.
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nandhu015



Joined: 11 Feb 2006
Posts: 640
Helped: 46
Location: Tamilnadu, India


Post18 Apr 2008 3:13   

unipolar vs bipolar stepper


Hi marquessalsero

Good selection..

Dont try to use your own stepper.
I would recommand you to use L293 & L298D driver for stepper.

It is lot more easier to work with

Regards
Nandhu
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Post18 Apr 2008 3:13   

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marquessalsero



Joined: 16 Feb 2006
Posts: 3


Post18 Apr 2008 17:43   

stepper motor unipolar vs bipolar


Many thanks, this is what I plan to use
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melc



Joined: 08 Apr 2005
Posts: 394
Helped: 45


Post18 Apr 2008 18:08   

bipolar unipolar stepper motor


marquessalsero wrote:
Thanks for your help.

I have been looking also to servo systems but are a lot more difficult for the first iteration ofthe project.

Most of the schematics I have seen fo stepper motor control are a lot more simpler.

So probably will go the bipolar.




Unipolar is easiest when you do not have a specific driver and you use only full step and half step with own designed drivers (with transistors). Bipolar is usefull for being used with standard industrial drivers and microstepping.
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