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Project using a strong 12 volt motor

onlyblue

Feb 2, 2013
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Hi
I have a new project that I need to use a strong motor (12 volts) and I need to control the speed.

I have been thinking for a car wiper motor because it has lots of torque. I will use as a power source a car battery.
What is the best way to control the speed of such motor?
Please give me your advice
 

onlyblue

Feb 2, 2013
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Thank you all for your replies, I had already search on ebay before I post, but I was not certain if the motor will work with most of the PWM I had found.
My concern is that the car does not use a PWM to control the motors. This is the main reason I had asked. Also my dilemma is which is the right one since they have different specs.

1 http://www.ebay.com/itm/12V-DC-5V-4...481?pt=LH_DefaultDomain_0&hash=item416d8743b9

2 http://www.ebay.com/itm/12V-24V-48V...308&pid=100010&prg=1076&rk=5&sd=150901337994&

3 http://www.ebay.com/itm/12V-36V-24v...308&pid=100010&prg=1076&rk=2&sd=150901337994&

4 http://www.ebay.com/itm/DC-Motor-Sp...994?pt=LH_DefaultDomain_0&hash=item23226baf8a

5 http://www.ebay.com/itm/DC-12V-24V-...043?pt=LH_DefaultDomain_0&hash=item3ccf47928b

This is the one I had in mind (since I want the reverse function) I suppose I can do it with the right switch
6 http://www.ebay.com/itm/5V-30V-5A-R...308&pid=100010&prg=1076&rk=1&sd=150901337994&
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
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I would think that your motor draws less than 5A. Do you know what it draws?

Chris
 

Laplace

Apr 4, 2010
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Wouldn't the current drawn by the motor vary with the load placed on the motor? The highest possible current would be the stall current. In the car what is the rating of the fuse on the circuit with the wiper motor?
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
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That implies that the manufacturer shouldn't bother listing it on the data plate because it varies with the load. :)

The ebay (10A) PWM model that I posted the link to should be fine because I doubt your motor will pull >10A.

Chris
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Measure the DC resistance of the motor. That will allow you to estimate the stall current.
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
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Measure the DC resistance of the motor. That will allow you to estimate the stall current.

Good idea Steve but he'd be wise to not rely on merely probe/touch contact to measure it.

Chris
 

CocaCola

Apr 7, 2012
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A wiper motor isn't that big and the cheap PWM controllers should work fine, but if you go into a larger motor you look at 'scooter' speed controller an all in one package...
 

onlyblue

Feb 2, 2013
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Wouldn't the current drawn by the motor vary with the load placed on the motor? The highest possible current would be the stall current. In the car what is the rating of the fuse on the circuit with the wiper motor?
I went back to the car junk and I have checked the fuse. it is 20Amps
 

onlyblue

Feb 2, 2013
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Measure the DC resistance of the motor. That will allow you to estimate the stall current.

I measured the current (without load) and it was 2Amps. Then I had a installed a 5Amps fuse and I put a bit of load on the motor. The fuse burned, my multimeter not :)

Thank you all for your answers. I will look for a smaller motor.
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
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I went back to the car junk and I have checked the fuse. it is 20Amps

I measured the current (without load) and it was 2Amps. Then I had a installed a 5Amps fuse and I put a bit of load on the motor. The fuse burned, my multimeter not :)

Thank you all for your answers. I will look for a smaller motor.

That's not the only load on that fuse. I would fully expect your wiper motor to pull about 5 to 7 Amps loaded or at start.

Chris
 
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