Wiper motor recommendations

Hello , what are the Ratio's of the Gearboxes ?

Hi Nath. Gearboxes are 25:1

So with the motors and these gearboxes , will the RPM be high enough? Does anyone else use these?

@Roadster2 , I think they are 160 rpm ish from memory? If so, thats around what most of us use with the AU motors.
@eaorobbie calculated that with a 50mm CTC lever , and the rpm stated, I think it was about 500mm per second linear speed, loaded with 10-15kg. SCN5 loaded at 5-10kg, 150mm per second.

Hi Nath/bsft I've just checked the spec and the motors are 4700 rpm ±10% so the gearbox output would be 188 rpm not taking into account any mechanical losses. So bsft is probably pretty close to the mark at 160 rpm.

Excellent! Id like the pair if thats ok. £110 for the motors and gearboxes was it ?

Hi Nath. No problem. I'll send you a pm.
Regards

I have the same ZYT90 models, bought them of the ebay while they were on the stock with 25:1 mcp4 gearbox, they were rated as 250watts, 5000rpm, 200rpm with gearbox.

Thanks guys.

Nearly have all the pieces in place now to begin my build.

I thought I might as well post this up to get a few ideas as it's relevant to the title. I went out to the garage this morning and dug out an old wiper mechanism and motor. The idea was to have a basic motor to play with just for testing. Here's the motor below. It's from a VW golf. I'm guessing that this won't be any good as the electrical plug and plastic covers the back of the gearbox where the pot would be attached. Is it possible that there may be some form of pot buried in there already?

no, motors dont have a feedback system on them at all. And make sure you earth isolate the motor casing.

Am i right in thinking something like this power supply would be ok for the 2 x 90ZYT-155-12 12V motors?

http://www.ebay.co.uk/itm/HP-server...omputing_PowerSupplies_EH&hash=item19e9eb4d2f

I know @Historiker is using them, and he has had success.

Here is a blog post on converting them for other uses, which pins to connect, etc.

https://sites.google.com/site/tjinguytech/my-projects/HP47A

I opened 2 VW wiper motors last night and I have a few questions about earth isolating them.

This first one. Are these starhead shapped parts pressed metal to stop people from seperating them?


And on this one. You can see where the brushes are connected to these coils. How would I earth isolate these? What are the coils and are they important? Sorry, I don't know much about these motors yet.

What I did to my wipers to isolate ground, I first connected the red and green wires directly to brushes, this part of your motors.

The best is to press the soldering iron where brush wire and coil are connected, it will slowly get loose under heat so you can easily pull brush wire out and leave the coil connected.

Then you are left with ground which usually have screw with metal plate which connects it to the wiper body. That connection must be cut or scratched. It can also help if you can see the connected on the bottom of the that board, you can easily track the lines and see where they go. I believe this is the ground where you need to cut off from second wiper:


And for the first wiper it is pretty much the same thing, this pressed screw is most likely the connection to the wiper base:


I also did put pieces of isolating tape on the bottom of the board, making sure it doesn't connects to the base somewhere. For that you need to unscrew the srews from the board, pull out the brushes a bit and remove the upper body of the motor, then detach the board. Cut small pieces of the tape and isolate the bottom parts.

Thanks. Some great advice. On the pic at the bottom - is this an actual screw though or will I have to cut it out? It's no big deal if I break it because I got it for free and I have some more as well.

Once you have isolated the ground in the pictures above the coils are redundant ? You have bypassed it so there is no point in it being there