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Old 04-09-2010, 06:46 PM   #1
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Default What do you prefer?

When connecting your motor to your speed control, do you directly solder the motor to your ESC or do you use some kind of connector? If so what kind? Right know I use 4mm bullet connectors, but I was told that there is too much power loss with connectors. What do you do?
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Old 04-09-2010, 07:11 PM   #2
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Direct solder all the time here and so does everyone else I run with.
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Old 04-09-2010, 07:33 PM   #3
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Solder direct!!!
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Old 04-10-2010, 06:28 AM   #4
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Well ok then! I guess it gives me a good reason to use my new Hakko soldering station!!
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Old 04-10-2010, 11:19 AM   #5
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If you use good connectors there's no reason why there should be any serious power loss. The new SP V3 motor can not have wires soldered in so they use the bullet connectors.
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Old 04-10-2010, 04:15 PM   #6
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The SP V3 motor manual reccomends that you solder the ESC wires to the motor connectors. Direct solder is the best known method.
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Old 04-10-2010, 04:20 PM   #7
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Quote:
Originally Posted by Hedaria View Post
The SP V3 motor manual reccomends that you solder the ESC wires to the motor connectors. Direct solder is the best known method.
The SPv3 motor has plugs, not direct solder. You can change motors without soldering and yes these plugs do fail.
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Old 04-10-2010, 10:26 PM   #8
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The SPv3 motor has plugs, not direct solder. You can change motors without soldering and yes these plugs do fail.
I know there's plugs. I'm just quoting what the SP V3 instruction recommends. Check out the lower right corner of the instructions.
http://www.speedpassion.net/uploadfi...eb25th2010.pdf
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Old 04-11-2010, 12:16 AM   #9
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Quote:
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I know there's plugs. I'm just quoting what the SP V3 instruction recommends. Check out the lower right corner of the instructions.
http://www.speedpassion.net/uploadfi...eb25th2010.pdf
yeah the motors come with the plugs attached, you still need to solder them to your ESC.
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Old 04-11-2010, 12:25 AM   #10
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i usually do a direct solder but a word of caution don't let your soldering tool stay on the wires too long as the heat will damage esc.. learned this the hard way
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Old 04-11-2010, 09:13 AM   #11
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Quote:
Originally Posted by Hedaria View Post
I know there's plugs. I'm just quoting what the SP V3 instruction recommends. Check out the lower right corner of the instructions.
http://www.speedpassion.net/uploadfi...eb25th2010.pdf

That is not the instruction manual that comes with the motors when you buy them. That bottom part there is missing altogether in the instruction sheet of V3 motors.

My guess is that those web instructions you linked to are an example of lazy "copy-paste" work on the part of some SP webmaster too bored to actually check out the picture they copy/pasted next to it where it is quite clear the solder tabs they refer to don't exist on a V3 motor. I would actually be very curious to see how the SP people would follow their own advice on a V3 motor.

And to answer the initial question, I prefer soldered.
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Old 04-23-2010, 10:25 PM   #12
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I use 3x 4mm Castle connectors with 12 AWG wire to connect my ESC and motor. Out of curiosity I measured the resitance of this type of connection vs a length of 12 AWG wire on its own tonight.

My multimeter was set to the 200 Ohm setting and the resistance of my leads was 0.7 Ohm. The bare wire was 0.8 Ohm resistance, 0.1 Ohm minus the resistance of the test leads. I did a worst case solder connection on the Castle leads and my resistance varied between 0.8 and 0.9 Ohm corrected to 0.1 to 0.2 Ohm if the test leads were factored out.

Basically the Castle connectors add 0.1 Ohm worst case over a 12 AWG wire connection of the same length.

The Castle connectors are a different design to the typical 4mm spring loaded connector which is what helps them achieve low resistance I think. For me they add a level of convenience when I swap motors/ESCs between vehicles and I'm really not going to see 0.1 Ohm extra resistance on the track. They haven't separated in a crash yet either. I've heat shrinked the bare connectors so they don't short out if the wires touch.

http://www.amainhobbies.com/product_...-Connector-Set

Last edited by spongerX; 04-23-2010 at 10:29 PM. Reason: Link Added
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