Proportional DC Motor speed controller - Electronic Circuits Projects Diagrams Free

ahmedragia21 · 6th April 2008, 12:11 AM

Hi, im having lets say two motors which have the same RPM but operation at different voltages , one is 12V and the other is 6V , i wanna make both move in straight line which means , both have the same speed .. how do i do that ? and how PID control can help in that ? i've two encoders attached to the motors ... that's what in my pocket right now ..

**Nigel Goodwin** · 6th April 2008, 10:44 AM

As you have encoders on each wheel, you just need to ensure that both wheels move at identical speeds and for identical distances.

I don't see as PID is anything to do with it?.

ahmedragia21 · 6th April 2008, 10:21 PM

yea , but how to do that , by measuring both RPMs ? and make both RPMs the same or what ?

dknguyen · 6th April 2008, 10:40 PM

Quote:

Originally Posted by ahmedragia21

yea , but how to do that , by measuring both RPMs ? and make both RPMs the same or what ?

Yeah, you have to measure both RPMs, and obviously you can't make the 6V motor go at the same speed as the 12V motor for all speed ranges since the 12V motor is capable of going faster and providing more torque.

ahmedragia21 · 7th April 2008, 12:37 AM

yea, i want the 12V motor to be like the 6V motor , to let the robot move at straight line path !
is that possible ?
also is there faster way to do that ? because measuring RPM needs measuring the revoultion per minute ! and its not possible , i want the robot to move at straight line since its start up ..

**Nigel Goodwin** · 7th April 2008, 08:27 AM

Quote:

Originally Posted by ahmedragia21

yea, i want the 12V motor to be like the 6V motor , to let the robot move at straight line path !
is that possible ?
also is there faster way to do that ? because measuring RPM needs measuring the revoultion per minute ! and its not possible , i want the robot to move at straight line since its start up ..

For any low frequency you don't measure the frequency, you measure the time between pulses - this makes it far faster to do. Presumably your encoders give multiple pulses per revolution?.

ahmedragia21 · 7th April 2008, 02:07 PM

Well, anyway nigel , im simulating this task in proteus , and i assume that im using 300CPP encoder with 110 rpm motors ..

so how do i measure the time between pulses ?
you mean Ton ?

**Nigel Goodwin** · 7th April 2008, 03:26 PM

Quote:

Originally Posted by ahmedragia21

Well, anyway nigel , im simulating this task in proteus , and i assume that im using 300CPP encoder with 110 rpm motors ..

so how do i measure the time between pulses ?
you mean Ton ?

Detect start of first pulse, start counter, wait for start of second pulse, then stop counter.

You should be able to use the CPP module to do this in hardware, or use software to do it.

6th April 2008, 12:11 AM	(permalink)
ahmedragia21 Experienced Member	Proportional DC Motor speed controller Hi, im having lets say two motors which have the same RPM but operation at different voltages , one is 12V and the other is 6V , i wanna make both move in straight line which means , both have the same speed .. how do i do that ? and how PID control can help in that ? i've two encoders attached to the motors ... that's what in my pocket right now ..

6th April 2008, 10:44 AM	(permalink)
Nigel Goodwin Super Moderator	As you have encoders on each wheel, you just need to ensure that both wheels move at identical speeds and for identical distances. I don't see as PID is anything to do with it?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

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6th April 2008, 10:21 PM	(permalink)
ahmedragia21 Experienced Member	yea , but how to do that , by measuring both RPMs ? and make both RPMs the same or what ?

7th April 2008, 12:37 AM	(permalink)
ahmedragia21 Experienced Member	yea, i want the 12V motor to be like the 6V motor , to let the robot move at straight line path ! is that possible ? also is there faster way to do that ? because measuring RPM needs measuring the revoultion per minute ! and its not possible , i want the robot to move at straight line since its start up ..

7th April 2008, 02:07 PM	(permalink)
ahmedragia21 Experienced Member	Well, anyway nigel , im simulating this task in proteus , and i assume that im using 300CPP encoder with 110 rpm motors .. so how do i measure the time between pulses ? you mean Ton ?