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Connecting Motor

Old 08-23-2021, 08:32 PM
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captglvr
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Default Connecting Motor

Hi All, I bought a balsa pattern plane used and it has no real connection between the ESC and the motor. One lead is soldered, the other two have female bullet point connections. The are no bullet point wires coming from the motor. What are my options besides cutting the bullets off the ESC and soldering to the motor. (BTW, I'm rather new to soldering)

I attached a photo, but the site won't let me "post an URL until I have 10 posts". Its a photo, not sure how that is a URL.

Thanks!





Old 08-24-2021, 03:21 AM
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Photo/URL, same rules

Most common installation is bullet connectors from the ESC to the motor. Female side is the power, male side to the powered device, that way if something is disconnected and gets power it won't short out and go bang.
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captglvr (08-24-2021)
Old 08-24-2021, 06:34 AM
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Thanks! So, I need to un-solder the one ESC wire directly soldered to the motor post, and solder a female bullet connector onto that wire, then solder male bullet wires to all three connectors on the motor. Yes?
Anything i should be careful about soldering to the ESC wire or the motor terminals? Cheers!
Old 08-26-2021, 10:41 AM
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The motorwires (extensions of the windingwires) are coated with insulation lacquer/resin, don't forget to remove before soldering:
Soldering motor wires - RCG, don't forget to activate the pre-fab search.

Don't play with throttle when moter stutters, can kill ESC and/or controller:
Motor stuttering? Won't run? - RCG



Safety
Remove prop when setting up or changing power system.

You can connect the three motorwires anyway you want. If motor runs in the wrong direction, just swap any two of the three motorwires. But NEVER EVER swap battery wires to reverse rotation, reversing battery polarity will ruin you controller, bigly, in the blink of an eye
Different colours for motorwires are handy for remembering the ESC→ motor connections, that's all

The three motor/ESC wires are equivalent, but not identical. They carry the same power signal albeit with a 120degree phase ('time') difference, switching between zero and full voltage. One complete voltage cycle corresponds with one magnet passing a stator pole.

See also these
brushless motor animations and simulations - RCG


Motorvoltages at full throttle, no chopping up voltage in pieces.
Click image for larger version

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Motorvoltages at partial throttle, PWM chopping ('grass') to reduce effective voltage.
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Zoomed in on above scope trace directly above.
V is chopped voltage, I is smoothed current.

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from www.consult-g2.com → course

Scope traces from www.aerodesign.de/peter, DIY brushless motor building (english&german).


Vriendelijke groeten Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC

Last edited by ron_van_sommeren; 08-26-2021 at 01:08 PM.
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captglvr (08-29-2021)
Old 08-26-2021, 01:06 PM
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You have to search (using the <ctrl>+f key combination) the two connector soldering videos on this page, the list is not that long
www.youtube.com/results?search_query=innov8tive+designs


Vriendelijke groeten Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC
1128

Last edited by ron_van_sommeren; 08-26-2021 at 03:02 PM.
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Old 08-31-2021, 06:01 PM
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Connector tests, plus pictures
translate...www.elektromodellflug.de/hochstrom-st.-bu..html
Older version of that page, contains some other connectors
translate...www.elektromodellflug.de/oldpage/hochstromst/hochstromstecker.htm
Excellent site, do have a look at the controller-, motor-, charger-, power supply-, battery- etc. tests.

Connector soldering jig, keeps pins straight in housing while soldering.
wattflyer.com/forums/showthread.php?t=79119

Two connector soldering videos
www.youtube.com/c/Innov8tive8/videos

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