Motor wires cut

[RandyatBBY]

I have a Leopard motor that the customer cut the wires, any one know how to fix? I Had a Hacker many years ago and I did the same thing to it and had to send the motor back to Hacker to be striped and re soldered. I was wondering if there was some one with the information that I could do it my self with the right solder.

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[stadiumyamaha]

Can you not just put bullets on it the way it is?

[stadiumyamaha]

It's hard to see in the pic but are the wire cut close to the motor?

[SweetAccord]

Ugh! You need to have the right length of the factory spec. I think you know that hence why you are asking. The way brushless motors work is that if they have bullets on them like a Tenshock, you can have any length wire on it. When a brushless motor has the lines go into the motor they have to be the right length as the length is used as a resistance for the signal line. Hopefully someone has the same motor and give you the exact correct length and or if Leopard can provide the info. Good luck!

[RandyatBBY]

Ugh! You need to have the right length of the factory spec. I think you know that hence why you are asking. The way brushless motors work is that if they have bullets on them like a Tenshock, you can have any length wire on it. When a brushless motor has the lines go into the motor they have to be the right length as the length is used as a resistance for the signal line. Hopefully someone has the same motor and give you the exact correct length and or if Leopard can provide the info. Good luck!

That sounds correct.

Can you not just put bullets on it the way it is?

No I do not think l so

It's hard to see in the pic but are the wire cut close to the motor?

Doubble click on the picture and you will be able to see better.

[JimClark]

will they not take solder? Somewhere on the board or RR I remember a thread about getting rid of the coating on the strands to allow solder to stick

[RandyatBBY]

will they not take solder? Somewhere on the board or RR I remember a thread about getting rid of the coating on the strands to allow solder to stick

I have not tried yet, I wanted more info. I did have a Pro motor that I had to clean the varnish off to get a good solder but the wires were not cut. I think we talked about it then a little.

[T.S.Davis]

Randy, it's shellac or lacquer or something on each strand...........I think. There is a way to strip some off but I don't remember how either. I know it's a pain in the butt. Wonder if sulfuric acid would work. Totally guessing.

[Fluid]

I am not familiar with the large Leopards, but if the wires exiting the can are extensions of the windings - and they are on most BL motors - then they are coated with lacquer and solder will not stick. There two ways to solder on bullets - either scrape off all the lacquer on every strand of wire with a sharp knife, or use a 'solder pot' to melt off all the lacquer. A soldering iron just won't work, especially on those thick wires. Get them hot enough to burn off the lacquer and you risk causing a short in the motor windings. Most acids will attack the copper wire while it's dissolving the lacquer. That's how printed circuit boards are made. If the wires are soldered onto the windings like on Castle motors, then no problem.

The lengths of wires on the motor are certainly not critical - neither the motor or the ESC knows if the wire length from the ESC to the motor windings is on one side of the plug or the other! All they care about is the total length from the windings. Otherwise it would make a big difference to the ESC how long the ESC wires are - which within limits it does not. The shorter the wire from the motor to the ESC the better - I have plugged the connectors on the motor wires directly into Schulze controller boards and set SAW records - but usually anything under 4 inches is fine.


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[cacofonix]

hi there

i have asked this question to Leopard during summer
because a customer (i'm selling Leopard in france) cut the wires
and esc burnt during next run.

Leopard answer me that solder bullet on cutted wires is very difficult
due to coating.

the only solution is to take each small wires one by one, and remove coating with thin blade

i agree that wires lenght is not critical

herve

[RandyatBBY]

I am not familiar with the large Leopards, but if the wires exiting the can are extensions of the windings - and they are on most BL motors - then they are coated with lacquer and solder will not stick. There two ways to solder on bullets - either scrape off all the lacquer on every strand of wire with a sharp knife, or use a 'solder pot' to melt off all the lacquer. A soldering iron just won't work, especially on those thick wires. Get them hot enough to burn off the lacquer and you risk causing a short in the motor windings. Most acids will attack the copper wire while it's dissolving the lacquer. That's how printed circuit boards are made. If the wires are soldered onto the windings like on Castle motors, then no problem.

The lengths of wires on the motor are certainly not critical - neither the motor or the ESC knows if the wire length from the ESC to the motor windings is on one side of the plug or the other! All they care about is the total length from the windings. Otherwise it would make a big difference to the ESC how long the ESC wires are - which within limits it does not. The shorter the wire from the motor to the ESC the better - I have plugged the connectors on the motor wires directly into Schulze controller boards and set SAW records - but usually anything under 4 inches is fine.


.

Interesting, thanks Jay. I would like to do it my self. I have a email in to leopard to see what they say.

hi there

i have asked this question to Leopard during summer
because a customer (i'm selling Leopard in france) cut the wires
and esc burnt during next run.

Leopard answer me that solder bullet on cutted wires is very difficult
due to coating.

the only solution is to take each small wires one by one, and remove coating with thin blade

i agree that wires lenght is not critical

herve

This had done the same thing to my customers ESC. It is now fixed

[Jason4636]

I learn something new everyday on this forum. I had cut my motor wires, and didn't think nothing about it. There's only about 1" of wire hanging out the back. I've only ran it one time. But I didn't fry my esc. Should I get another motor?

[egneg]

Put some brake fluid in a shallow dish and suspend the motor wires for 24 hours or so. The brake fluid will slowly dissolve the coating and not harm the wires.

[RandyatBBY]

Put some brake fluid in a shallow dish and suspend the motor wires for 24 hours or so. The brake fluid will slowly dissolve the coating and not harm the wires.

Ya brake fluid does eat paint

[AndyKunz]

Ugh! You need to have the right length of the factory spec. I think you know that hence why you are asking. The way brushless motors work is that if they have bullets on them like a Tenshock, you can have any length wire on it. When a brushless motor has the lines go into the motor they have to be the right length as the length is used as a resistance for the signal line. Hopefully someone has the same motor and give you the exact correct length and or if Leopard can provide the info. Good luck!

No, that's not right at all. They can be any length.

As for the coating, it's probably a high-temp enamel-coated magnet wire that you're dealing with. The high temp stuff is really REALLY hard to get off; the best bet is to scrape each and every strand. It's a lot of tedious work.

Randy, if it were me, I'd tell them they just destroyed their motor. It's a LOT of time you could spend doing something more useful.

Andy