Hi there..
I'm trying to find out what kind of motor i could buy that would simulate a windshield wiper motor. I would like it to run on 2 AA Bateries..
Any help would be appreciated..
simulate a windshield wiper motor
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Re: simulate a windshield wiper motor
I know the windsheild wiper motors used on cars are very power hungry and may only last seconds (if that) on AA batteries.<p>When you say simulate do you mean something that could push some windsheild wipers or something that will just spin when the wipers should be on?
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Re: simulate a windshield wiper motor
i'm looking for a motor that will turn clock wise, then pause, then turn counter clockwise, then pause, and then repeat....
Re: simulate a windshield wiper motor
I doubt you will find anything premade. <p>Essentially, you want an h-bridge and a timer (555 will do it). The h-bridge is used to control direction of the motor and the timer is used to control the h-bridge. The timer output of the 555 should go into the direction control of the h-bridge. <p>set the 555 up in astable mode with a period of twice how ever long you want it to run for. You may have trouble getting the duty cycle to be exactly 50%, though. Here's (one of thousands...) a page on using the 555 http://www.doctronics.co.uk/555.htm#monostable<p>You could build your own H-bridge with transistors - look here http://www.mcmanis.com/chuck/robotics/t ... rcuit.html
Or you can use an H-bridge chip. I'd take a look at the L293, L298, LMD18200 or 754410. (the 754410 has integral diodes - makes it easier to use and digikey has it for <$2). Note that you may need to move up to 4 batteries as these all want more than 3V.
Or you can use an H-bridge chip. I'd take a look at the L293, L298, LMD18200 or 754410. (the 754410 has integral diodes - makes it easier to use and digikey has it for <$2). Note that you may need to move up to 4 batteries as these all want more than 3V.
Re: simulate a windshield wiper motor
After the control electronics are all set there are other things to think about regarding the motor. <p>What type of load is it going to carry? If it's something like a windsheild wiper you may want to consider a gear motor (Jameco has a large selection of these). If it's lighter than that there are a lot of alternatives.<p>Also, a servo might work if it's only going to turn 60 degrees or so.
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Re: simulate a windshield wiper motor
wow philiba..
I wish I could understand you.. I don't have any background in electronics. I can't even decipher those schematics or plans. Is there a easy to read book to figure thsi stuff out?
I wish I could understand you.. I don't have any background in electronics. I can't even decipher those schematics or plans. Is there a easy to read book to figure thsi stuff out?
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Re: simulate a windshield wiper motor
Jeff: The load it will carry will be about 6 to 20 ounces
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Re: simulate a windshield wiper motor
Hi Jeff..
The Load would actually be around 1 to 10 ounces I am guessing..
And..can you explain more about your servo motor?
I was looking at the motion that the motor from my cd rom maske (just the In And out) and that could possibly work as well..
The Load would actually be around 1 to 10 ounces I am guessing..
And..can you explain more about your servo motor?
I was looking at the motion that the motor from my cd rom maske (just the In And out) and that could possibly work as well..
Re: simulate a windshield wiper motor
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Brentusbrutus:
wow philiba..
I wish I could understand you.. I don't have any background in electronics. I can't even decipher those schematics or plans. Is there a easy to read book to figure thsi stuff out?<hr></blockquote><p>oh, never mind...<p>the problem here is that you are off the beaten path and that requires some invention. Invention needs *some* background in electronics. The book "Building Robot Drive Trains" has lots on motor control at a fairly simple level but doesn't explain electronics. I'm sure there is a 555 timer for dummies book or web page out there so its possible for you to figure this stuff out but I fear you will be on a journey that is far longer than you wanted.<p>Wish I could point you to some place that would work for you.<p>Phil
wow philiba..
I wish I could understand you.. I don't have any background in electronics. I can't even decipher those schematics or plans. Is there a easy to read book to figure thsi stuff out?<hr></blockquote><p>oh, never mind...<p>the problem here is that you are off the beaten path and that requires some invention. Invention needs *some* background in electronics. The book "Building Robot Drive Trains" has lots on motor control at a fairly simple level but doesn't explain electronics. I'm sure there is a 555 timer for dummies book or web page out there so its possible for you to figure this stuff out but I fear you will be on a journey that is far longer than you wanted.<p>Wish I could point you to some place that would work for you.<p>Phil
- Clyde Crashkop
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Re: simulate a windshield wiper motor
Take a look at the wiper motor/linkage on your car or another one if it’s covered up and you can’t see it. The motor just rotates with pin that is off center moving a linkage back and forth. Any slow or gear reduced motor will do that.
Dave
Dave
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Re: simulate a windshield wiper motor
Pretty much what Dave Hogan said, but I would add that you can search the web and find mechanisms all over the place. It's easier for a non-technical person to understand a mechanical drawing than an electronic one. I believe the windshield wiper mechanism is a four-bar linkage. If you Google for that term you should find something you can build and connect to an ordinary motor to get the motion profile you need.<p>Otherwise, your options are
1) Get ready to learn a lot about electronics or
2) Pay someone who already knows a lot to do it.
1) Get ready to learn a lot about electronics or
2) Pay someone who already knows a lot to do it.
Re: simulate a windshield wiper motor
OK, I think I have a solution for you if you are willing to go with 5 batteries (on 9V for the timer and 4 1.5V for the motor). Get this kit: http://www.electronickits.com/kit/compl ... ck1614.htm
It controls a relay. use mode 5 (toggling) which switches the relay on and then off at a preset interval. Download the manual and take a look. Hook up the batteries, motor and relay output as follows:
- get a 4 battery holder. hook the positive connection to the NC connector on the relay.
- hook the negative bat holder connection to the NO connector on the relay.
- hook the relay center (C) to one terminal of the motor
- now the slightly tricky part. Find the place on your battery holder where the 2nd and 3rd batteries are connected. Connect a wire there and run that wire to the other motor terminal.<p>Now, when the timer runs, it will switch between giving the motor + and -, thus alternating directions.<p>Your requirement of 2 1.5V batteries is actually a big challenge. It could be done with some engineering but its not simple.<p>[ March 14, 2005: Message edited by: philba ]</p>
It controls a relay. use mode 5 (toggling) which switches the relay on and then off at a preset interval. Download the manual and take a look. Hook up the batteries, motor and relay output as follows:
- get a 4 battery holder. hook the positive connection to the NC connector on the relay.
- hook the negative bat holder connection to the NO connector on the relay.
- hook the relay center (C) to one terminal of the motor
- now the slightly tricky part. Find the place on your battery holder where the 2nd and 3rd batteries are connected. Connect a wire there and run that wire to the other motor terminal.<p>Now, when the timer runs, it will switch between giving the motor + and -, thus alternating directions.<p>Your requirement of 2 1.5V batteries is actually a big challenge. It could be done with some engineering but its not simple.<p>[ March 14, 2005: Message edited by: philba ]</p>
- Chris Smith
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Re: simulate a windshield wiper motor
No need to reinvent the wiper motor action in a electronic fashion. They are stickily mechanical and far more reliable this way. After all, they didn’t have "semi conductors", “stamps”, or “Pics” when they were making the Model T! <p>And even back then, they were hand cranked before the vacuum motors took over, then the electrical motors took over the vacuum motor.<p>The way a wiper works is not that the motor goes left, then stops, and then starts backing up the motor.<p> Its far more simple, Its called a “Bell Crank” and the way it works is very simple.<p> You start off with the motor spinning in a circle at all times and the shaft of the motor had a small lever on it, with a ball socket and feed arm. <p>This socket has a arm that attaches to a longer arm on another shaft that also has a bearings on its shaft and arm. <p>When the motor with its short arm reaches its closest point to the other shaft, the spin brings it back and thus the longer arm never makes a full circle and [the wiper] returns in a sweeping motion of less than 360 degrees. <p>The ratio of the two arms is what determines the sweeping motion of the second arm.<p> For example a one inch arm on the wiper motor and a three to four inch arm on the shaft, produces the typical blade sweep on most cars and trucks.
Re: simulate a windshield wiper motor
Very good chris. You suceeded in both not answering his question and lecturing about how much better your non-solution was. <p>To refresh your memory, here is what he said "i'm looking for a motor that will turn clock wise, then pause, then turn counter clockwise, then pause, and then repeat...."<p>Note the motor turning clockwise/counter clockwise part. maybe he can solve his problem with a bell crank but that's not what he asked for.
- Chris Smith
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Re: simulate a windshield wiper motor
Actually he said "I'm trying to find out what kind of motor I could buy that would simulate a windshield wiper motor." with no mention of its actual function.<p>If all he wants is a sweep then That’s how he should accomplish it. I try not to read minds.
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