### Author Topic: Power a windshield wiper motor  (Read 1395 times)

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#### jayala1985

• Beginner
• Posts: 1
##### Power a windshield wiper motor
« on: September 21, 2012, 10:35:04 AM »
Im looking to create what is found on animatronicsign.com, I need it to be mobile and run for 10 hours.  I planned on using a windshield wiper motor connected to a deep cycle batter but not sure on amps that the motor is drawing.  Really need to complete build on a budget any suggestions on best motor/mobile power supply combination.  It also needs to be rechargeable.  Thank you Im a first time builder and on a budget and time crunch.

Jason

#### newInRobotics

• Supreme Robot
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##### Re: Power a windshield wiper motor
« Reply #1 on: September 21, 2012, 12:09:00 PM »
Measure resistance of motor windings and derive current draw using Ohm's Law
"Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music." - Kristian W

#### waltr

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##### Re: Power a windshield wiper motor
« Reply #2 on: September 21, 2012, 06:03:05 PM »
Measure resistance of motor windings and derive current draw using Ohm's Law
For the peak or stall current. The running current will be less and will vary depending on the load.

To measure the running current place a small value, high wattage resistor in series with the motor/battery. Then measure the voltage drop across the resistor and calculate the current with Ohm's Law.

#### newInRobotics

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##### Re: Power a windshield wiper motor
« Reply #3 on: September 22, 2012, 03:42:52 PM »
To measure the running current place a small value, high wattage resistor in series with the motor/battery. Then measure the voltage drop across the resistor and calculate the current with Ohm's Law.
This is much better way. Totally forgot about it.
"Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music." - Kristian W