Nehpets4Him
Posts: 14
Joined: Thu Jun 19, 2014 2:01 am

Power question regarding motors

Fri Feb 26, 2016 4:14 pm

I previously posted this on a previous fourm thread, but responses have not come.
I need help on this. I am building a robot using a old RC car. If the battery is 6V 2.4W and I have 4 motors, how can I find out how much each needs? I found out the multimeter I had was too low for simple batteries. Any ways to figure this out? I know that a new mulitmeter might be the only option.

Hagar
Posts: 22
Joined: Thu Feb 25, 2016 9:34 pm

Re: Power question regarding motors

Fri Feb 26, 2016 10:24 pm

At 6v and 2.4 w you will have approx 100mA available for each motor if use are turning them all at the same time. This is probably insufficient but it really depends on the motors and how you are using them. Most small dc motors require about 400 mA+ when they start turning. Do you have a model/type of motor in mind? If you do then try a google for the data sheet. Alternatively measure the current drawn for one when it starts and times by 4. I don't understand what you mean by your multimeter being ' too low' do you mean it doesnt have a 1Amp range?

boyoh
Posts: 1468
Joined: Fri Nov 23, 2012 3:30 pm
Location: Selby. North Yorkshire .UK

Re: Power question regarding motors

Fri Feb 26, 2016 11:08 pm

What are the specifications of the motors voltage watts/ amps , you are using
If you know the motor voltage , but not the current, do a current check on one motor
Put 10ohm resistor( high wattage) in series with the motor , run the motor
then using your meter to check the voltage drop across the resistor, use ohms law
to give you the current flowing through the motor. ( x4 ) allow extra AH for loading.
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

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