Author Topic: --- DC motor DriveR ---  (Read 3028 times)

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Offline benjiTopic starter

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--- DC motor DriveR ---
« on: September 26, 2008, 05:09:14 AM »
I was thinkin to build/design a circuit to optimally control dc motors
i mean

1/ speed
2/ position
3/torque
4/ brake  << most important

anyways the most used way to control speed is PWMing the dc motor so the average voltage would change
but,, is this efficient enough ? wouldnt be more efficeient if we decrease the supply voltage?

i was thinking if a group of us share the design , we can build it together,, wut do u think?
good ol' BeNNy

Offline airman00

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Re: --- DC motor DriveR ---
« Reply #1 on: September 26, 2008, 09:17:56 AM »
you are trying to make continuous rotation or not?
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline benjiTopic starter

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Re: --- DC motor DriveR ---
« Reply #2 on: September 26, 2008, 10:36:21 AM »
both ,,
good ol' BeNNy

Offline ArcMan

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Re: --- DC motor DriveR ---
« Reply #3 on: September 26, 2008, 11:07:15 AM »

anyways the most used way to control speed is PWMing the dc motor so the average voltage would change
but,, is this efficient enough ? wouldnt be more efficeient if we decrease the supply voltage?

i was thinking if a group of us share the design , we can build it together,, wut do u think?

A PWM motor drive is very efficient.  A PWM motor drive effectively decreases / increases the supply voltage to the motor by vary the PWM duty cycle.  There are many, many designs out there already and even chips that implement those designs.


Offline benjiTopic starter

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Re: --- DC motor DriveR ---
« Reply #4 on: September 26, 2008, 11:29:18 AM »
well i was talking about the 4 things i want to control,, im thinking an individual speed/torue/position driver
good ol' BeNNy

Offline ArcMan

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Re: --- DC motor DriveR ---
« Reply #5 on: September 26, 2008, 11:51:56 AM »
Oh.  OK.  That does sound like a good project.

There is a commercial version:
http://www.pololu.com/catalog/product/425

but I haven't seen many hobbyist-designed solutions.

Offline Webbot

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Re: --- DC motor DriveR ---
« Reply #6 on: September 26, 2008, 01:39:41 PM »
I was thinkin to build/design a circuit to optimally control dc motors
i mean

1/ speed
2/ position
3/torque
4/ brake  << most important

anyways the most used way to control speed is PWMing the dc motor so the average voltage would change
but,, is this efficient enough ? wouldnt be more efficeient if we decrease the supply voltage?

i was thinking if a group of us share the design , we can build it together,, wut do u think?

Have you seen my Motor Driver tutorial at http://www.societyofrobots.com/member_tutorials/node/159

This helps set speed etc and the Tri-State Switch also provides braking.

Webbot Home: http://webbot.org.uk/
WebbotLib online docs: http://webbot.org.uk/WebbotLibDocs
If your in the neighbourhood: http://www.hovinghamspa.co.uk

Offline benjiTopic starter

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Re: --- DC motor DriveR ---
« Reply #7 on: September 27, 2008, 09:40:39 AM »
hey webbot ,,good work ,,ihave seen some ICs ,they could be helpfull
they can be included in such a circuit i guess,,
but im talking about somthing bigger,,, maybe close to industrial inverters for ac motors
good ol' BeNNy

Offline benjiTopic starter

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Re: --- DC motor DriveR ---
« Reply #8 on: September 28, 2008, 09:10:41 AM »
well first , considering such a project one should model the dc motor,, have the equivalent circuit
i ve been lookin for it and most sites on the internet tell that its (R ,L ,emf) the emf is propotional to the rotational velocity

any other components to include?
good ol' BeNNy

Offline benjiTopic starter

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Re: --- DC motor DriveR ---
« Reply #9 on: September 29, 2008, 10:32:26 AM »
now i know where to start , first to model then to build the controller, im gonna use matlab for modeling/controller PID design

i found this link very benefical and it has some other links mentioned below in the page

www.engin.umich.edu/group/ctm/examples/motor/motor.html
good ol' BeNNy

 


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