wiper ground

the bench test for my wiper motor says to attach a ground wire to the frame of the wiper, this is giving me a ground on the frame, shoudl I remove this? it has a ground on the pinout as well?

thanks

any picture? :yes:

When using wiper motors in an application with direction reverse, there is no ground wire.
So if you connect one wire of both motors to the frame, you will produce a shortcut, which destroys the MosFets on the h-bridge.
You need to isolate the motors from the frame and motor housing.
Eventually you have to dismantle the wiper motors, and detach the gnd wire from the housing.

regards

ego is right, you cannot have the motor connections connected to the frame.

It is OK to have it connected to the motor housing, as long as you make sure to isolate it from any metal objects and make sure nothing can fall near, or touch it to ground.

not really sure how to isolate completely since the rod arms would connect to the motor and the rod arms connect to the metal sim, so in the end even if i create i gap between the motor and the frame the arm is still touching

Here is the benchtest for the motor describing how I have to connect ground to the center post and to the motor housing as well.

When I remove the ground/earth wire from the housing the power supply shorts and turns off.

http://www.cardone.com/english/club/pro ... 0-0004.pdf

You need to take the motor apart and see what is connected to what.

You need to find the brushes, usually there are 3 in wipers. You have to make sure these brushes and their connections are not touching anything and disconnected from the housing. Take the wires that connect to these brushes and only use these, don't worry about the ones for switching.

The brush further from the other 2 is your common, the other 2 is for low and high speed. I seen good tutorials posted, but google is your best friend!

the only problem with that is that my motor has a pc board on it, so when you take that cover off there is a pcb, that pcb on the outside has 5 pins, 1 for ground and 3 to make the high speed run. when i open it up, it doesnt use wires, it does have 3 prongs that feed into the motor housing.

like this

so youre saying I should bypass the pulse board?

ok so i took the whole thing apart, it looks like where the motor goes through the housing there is an additional pcb with the magnets and that has points that touch the frame. I tried covering these with black electrical tape but I can still touch a + line and ground it out on the cover and can see sparks if I tap the motor to my sim frame.

This is basically like the inside, this is where the metal touches the house I think, covered with electric tape but im not sure if there is a ground touching the housing somewhere else or if the traces arent the only issue.

http://www.rn-wissen.de/index.php/Trico ... schermotor

here is my wiper wiring setup. maybe can help you.take a look

http://simf1.blogspot.com/p/electronic.html

thanks Kub,
I was able to find that some traces were contacting metal on a pcb wiht the magnets around the motor shaft. I used black tape melted with a heat gun to cover there and scraped the traces away from around the screws for extra.

Now the new issue is that my motors have a pulse board, seems to be more advanced wiper motor engine. I cant get the motor to go in the reverse direction in the pololu jrk software, it will only go one direction.

After that I burned out a few mosfets (the H-Bridge, my fingers and my table suffered a bit aswell ) I realized that I was facing the wiper ground issue.
Is ok to isolate the ground or should I wire it to somewere?

Shannonb1, I think my wiper is the standard model . I did not saw one like yours.
regards!

Once again...there is no ground wire when using a h-bridge!

Depending on the rotation direction there are +12V on the wiper motor GND wire (or housing).

The wiper motors GND have to be isolated from the motor housing, OR the wiper motor housings have to be isolated from the frame (by screwing them on a wooden or acrylic plate).
I'd prefer to open them up, and disconneting the GND line from the housing, like suggested in the pictured rn-wissen.de/... link above.

regards

ego I did that, and yes now I have the 3 wires going to the + (red) and the - going to the black, no longer is the casing grounded. im just not certain that with the pulse board on my wiper motors that my engines will turn in the opposite direction.

ok cool, so i got a simplier motor to test, one with the 3 wires,i got the jrk utility to spin it both ways! now to see if I can somehow mod the motors with the pulse control, i would like to bypass that card. ideas?

i also notice that the motor is faster in one direction, I assume this is normal? anyway to fix?