Wiper motor how many amps

They also offer power supplies and a motor speed control. Here's a side by side comparison of the Monster Guts motor left and the Saturn motor. As you can see, beside the fact that the gearbox is on different sides, they are very similar in size and methods of mounting. The electrical connections are also very similar you'll find pin-outs for both on the next page. The Monster Guts motor is a bit slower with speeds of rpm 12 volts and rpm 5 volts.

More details on the Monster Guts website. FrightProps is another source for a new motor and motor accessories.

Their motors feature wires already attached to simplify wiring and a shaft arm ready to attach to your prop. They also have a variable speed power supply see below.

An old computer power supply has 12 volt outputs and usually delivers ample current. Here's more information on how to use one. See note at left. Here's a 12 volt, 5 amp power supply from Monster Guts. This is NOT a surplus supply and should consistantly be available. Many battery chargers will work fine. Joined: Dec 19, Posts: Profile Page. That's a bit crude, I think. Sure, it may work well when the current is known and stable enough, but if it varies there will also be a big change in voltage.

Generally, using a resistor to drop the voltage to an electric motor is not a very good idea. Sure it's simple and usually it works well enough, but a electric motor draws WAY more current during start or any other time it's at very low rpm than when running on normal rpm.

That means that if the resistor is dimensioned for correct voltage during normal operation, the increased current draw at startup would cause the voltage to drop way down. The motor may start but take longer time to reach normal rpm, or it might simply not start at all, because 1V or whatever it actually gets isn't enough to get it moving. Worse still, if the motor is left on but unable to start, the current may be enough to fry it.

It may not be very old style, but today I'd go for electronic voltage reduction, one way or another. For low power items, I'd suggest a regulator, it's a simple device that costs probably a dollar or two it needs a couple of small capacitors, also cheap, and a cooling fin depending on how high current you need. There are many versions of these, I think they can handle up to 1,5A or maybe 2A if you pick the right one.

If you sell resistors to reduce voltage already, those would be a nice complement. More stable output, but limited current available. For higher powered items that doesn't require a stable, interference free voltage I could go for a PWM regulator. PWM is short for pulse width modulation, it works by turning the current of for usually thousands of times per second.

Neither draw more than 2. Mine normally takes about 2 amps and runs at around 8 volts. I actually run it from an old variable voltage lab PSU, which has built in voltage and current meters.

I used a tumbler gear mechanism to provide both reversing and disconnection so that the right handwheel can be manually turned. If you are quick enough or brave enough, you could measure the short circuit current with an ordinary digital or analogue meter with the motor stalled.

I would not be surprised it it was more than 20A. I used car wiper motors on several projects 20 or more years ago and found that some modifications became essential. Most wiper motor only rotate in one direction and the gearing and bearing arrangements are optimised for that direction.

One I used had now provision for the motor spindle with its integral worm gear to handle the thrust in the reverse direction. I have also come across the tooth form on the worm and pinion being assymetrical like a buttress thread so the gearing efficiency is significantly different in the two directions. I have no knowledge of the internal design of the wiper motor you have used and its more than possible that the potential problems dont exist in yours.

One other point is that the method of obtaining the two speeds is often by using a third carbon brush positioned so that it uses fewer of the armature windings. Less copper means less resistance so the motor current is much higher resulting in the increased speed. The motor efficiency suffers at the higher speed but the vehicle electrics can cope with it.

Finding a power supply with a PWM output with a high enough current rating to cope with a relatively high current motor might not be easy. My choice would be to use the slow speed brush connection but use a higher than 12V supply say 15 or 18V. For the number of times I use the mill if the motor lasts a year and then has to be replaced that's not a problem.

They are cheap enough. I use an old Lucas wiper motor for the power feed on my mill, I extended the shaft through the worm wheel to take a sprocket, ten tooth to motor, 20 tooth to mill, joined with a bit of bike chain that is loose enough to be lifted off for manual feed.

The motor works ok in both directions, and I run it on 18volts. Wiper motor availability in 12v and 30 amps? Asked 4 years, 1 month ago. Active 4 years, 1 month ago. Viewed 4k times. Jagadish Kumar Jagadish Kumar 1 1 1 silver badge 2 2 bronze badges. Add a comment. Active Oldest Votes. Charles Cowie Charles Cowie School of Mechanical Engineering, VIT University, Vellore, India I have observed that they are using wiper motors to lift the automobiles by connecting to an hydraulic Jack with mechanism.