fly boy3 Posted March 4, 2015 Share Posted March 4, 2015 Hi all, can I extend my brushless motor leads about 20 inches without causing a problem to power chain, and are the receiver and Esc to be kept apart. Thanks Edited By fly boy3 on 04/03/2015 20:33:42 Quote Link to comment Share on other sites More sharing options...
Allan Bennett Posted March 4, 2015 Share Posted March 4, 2015 Yes, you can extend the motor leads. Just make sure the extended wires are at least the same gauge as the original motor wires. If you're using 2.4GHz radio, it's not so important to keep receiver and ESC apart as it used to be with 35MHz. -- though it's good practice if you have the space. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted March 4, 2015 Share Posted March 4, 2015 If you MUST extend power wiring, do it between the ESC and the Motor, but if you can avoid doing so its better.... 20" will cause some losses but nothing drastic - 2.4G RX's are in theory pretty immune to motor/esc noise, but its always best to get the biggest seperation you can Quote Link to comment Share on other sites More sharing options...
Old Geezer Posted March 5, 2015 Share Posted March 5, 2015 I always understood that altering the length significantly of the wires between the motor and the ESC was a no-no as it could compromise the feedback from the motor to the ESC, which is fundamental to how the set-up works. (Though, within reason, you could safely extend the length of the wires from the battery to the ESC.) Will now retire to bunker and listen to the "Full & Frank exchanges of views" that are likely to ensue. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted March 5, 2015 Share Posted March 5, 2015 Posted by Gurth Scriven 2 on 05/03/2015 08:16:22: I always understood that altering the length significantly of the wires between the motor and the ESC was a no-no as it could compromise the feedback from the motor to the ESC, which is fundamental to how the set-up works. (Though, within reason, you could safely extend the length of the wires from the battery to the ESC.) Will now retire to bunker and listen to the "Full & Frank exchanges of views" that are likely to ensue. If you want to extend the battery side wires you also need to provide additional spike elimintation capacitance in the power input circuit as the existing capacitance will be insufficient (the two large capacitors places between the power input cables on the average ESC) In depth discussion here... **LINK** Quote Link to comment Share on other sites More sharing options...
Allan Bennett Posted March 5, 2015 Share Posted March 5, 2015 Posted by Gurth Scriven 2 on 05/03/2015 08:16:22: I always understood that altering the length significantly of the wires between the motor and the ESC was a no-no as it could compromise the feedback from the motor to the ESC, which is fundamental to how the set-up works. (Though, within reason, you could safely extend the length of the wires from the battery to the ESC.) Will now retire to bunker and listen to the "Full & Frank exchanges of views" that are likely to ensue. No, you've got it the wrong way round; the length of the motor wires (within reason) isn't going to change the feedback significantly, given the speed at which electricity travels. On the other hand, extended battery-to-ESC wires can generate more electrical spikes, which can be detrimental to the capacitors and, eventually, the other electronic components in the ESC. Quote Link to comment Share on other sites More sharing options...
Old Geezer Posted March 15, 2015 Share Posted March 15, 2015 I see - - - - - I think Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted March 15, 2015 Share Posted March 15, 2015 Garth Allen B is quite correct. It is the battery to ESC that has the length limitation. The ESC is switching the current from battery on and off pretty rapidly. This can cause voltage spikes to be created in the battery cables so substantial capacitor(s) are built into the ESC to protect the sensitive electronics. The longer the battery wires the worse the spikes. If you extend the battery wires much over 12" it is advisable to add extra capacitors and preferably at intervals along the wire. The wires to the motor also produce voltage spikes but the motor, unlike the electronics in the ESC. is much more tolerant. Any long cables do of course increase the resistance losses unless they are of generous cross section for the current they are carrying but then they become heavy. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted March 15, 2015 Share Posted March 15, 2015 Hi , in-order to shift weight from the back of my indoor model i am extending the motor wires of a 1504 2s motor 20cm , i am hoping this will not impede the performance too much as this wires are single core varnished and are only 0.35mm thick. Steve Quote Link to comment Share on other sites More sharing options...
Allan Bennett Posted March 15, 2015 Share Posted March 15, 2015 Posted by Stephen Jones on 15/03/2015 01:10:48: Hi , in-order to shift weight from the back of my indoor model i am extending the motor wires of a 1504 2s motor 20cm , i am hoping this will not impede the performance too much as this wires are single core varnished and are only 0.35mm thick. Steve Personally, I would use flexible wire for the extensions to reduce the risk of it breaking due to flexing with vibration. If weight is a big issue (wire covering often weighs more than the wire itself) you can use the rigid varnished stuff if you support it enough that it can't flop around. You don't say what motor you're using, but make sure that 0.35mm is enough to carry the amps comfortably. I would say your extensions want to be a bit thicker than the stock motor wires, just to be sure. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted March 16, 2015 Share Posted March 16, 2015 Hi , Success every thing works fine , My ESC is packed into the nose while the motor is at the rear , also a small 300ma 2s battery is also in the nose . I put foil around the motor wires to prevent any interference may not be needed , all works fine . Steve Quote Link to comment Share on other sites More sharing options...
Geoff Reynolds Posted May 23, 2015 Share Posted May 23, 2015 No, you've got it the wrong way round; the length of the motor wires (within reason) isn't going to change the feedback significantly, given the speed at which electricity travels. On the other hand, extended battery-to-ESC wires can generate more electrical spikes, which can be detrimental to the capacitors and, eventually, the other electronic components in the ESC. Right, so taking this another step, if (standard/in my case) battery leads are about 4" long and an ESC has roughly the same length of wires. The total length is near 8". Is this too long? To make shorter, would you cut the ESC wires, not shorten all the battery wires? Therefore moving the ESC further from the motor (and air intakes) or stick with them as they are? EG Quote Link to comment Share on other sites More sharing options...
Shaunie Posted May 23, 2015 Share Posted May 23, 2015 If you want the foil to be effective then you will need to connect it to the battery negative lead, otherwise it's a waste of space. Feeding the wires through a ferrite ring near the ESC may also help. Shaunie. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 23, 2015 Share Posted May 23, 2015 Geoff Up to 12" is the recommended maximum battery to ESC length. At 8" I would leave everything just as it is. If you do shorten leads it is best to shorten the thinner one but If they are the same gauge it makes no difference which you do. Quote Link to comment Share on other sites More sharing options...
Geoff Reynolds Posted May 23, 2015 Share Posted May 23, 2015 Posted by Simon Chaddock on 23/05/2015 23:02:55: Geoff Up to 12" is the recommended maximum battery to ESC length. At 8" I would leave everything just as it is. If you do shorten leads it is best to shorten the thinner one but If they are the same gauge it makes no difference which you do. Thanks Simon. Manufacturer of ESC (turnigy) says no more than 6" total, (I forgot to say originally). Leads are about same diameter, so can cut some off the ESC side to be sure. Cheers EG Quote Link to comment Share on other sites More sharing options...
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