Motor Speed Problem

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M Abbas's Avatar (by Gravatar)M Abbas posted on
July 21, 2005, 7:50 am
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Hi Folks!..
i've got a problem with motor speed i am building an Atutonomous Ground
Vehicle(AGV).
And controlling its two wheel with diffrential movement...
The thing is the motors i have bought have diffrent RPM (diffrence of 8
RPM); basically they are gear motors 24 Volt DC .Can you plz tell me
how to make their RPM Equal.

I have two Sugesstion ...

1. Operate both motors at diffrent voltage to make their RPM Equal.
2. Attach some High Value Resistors to one motor and apply same voltage
to both motor
   to make their RPM equal.

Folks plz tell me which appraoch is better ? or u have some new
sugesstion.
One thing more if i use one of above mentioned approach what will be
the affects when i apply load on the motors..

Reagards,Abbas..


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mlw's Avatar (by Gravatar)mlw posted on
July 21, 2005, 5:21 am
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Re: Motor Speed Problem



Without using a magnetic clutch between the two motors, you can't get them
to go at the same speed without some sort of closed loop motor control
system.



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M Abbas's Avatar (by Gravatar)M Abbas posted on
July 22, 2005, 3:31 pm
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Re: Motor Speed Problem

Hi !
"mlw" can you tell me about megnetic clutch,what it is how it operated
also is it possible to use when u are operation motors in diffrentional
movement ?
bye.


mlw's Avatar (by Gravatar)mlw posted on
July 22, 2005, 1:14 pm
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Re: Motor Speed Problem



The first time I saw the technique used was in the late 1970's on a Mattel
"BigTrak" toy. Presumably, behind the gear box, the torque load on the
motors is pretty low. The two motors are mounted back to back. A magnet is
attached to the back of each shaft in such a way that they attract one
another. When the motors are goin forward at the same speed, the magnet
from one motor can help pull the magnet of the other when the load is
uneven. When you are going in different directions, the magnetic clutch
breaks.

It is a subtle effect, in that it doesn't stand up against directly opposing
power to the motor, but when driven at the same power, has enough influence
on the drive of each motor to keep them in sync.


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