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Motor pulsing

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Cliff 195930/04/2019 13:43:40
260 forum posts
58 photos

My friend has a problem in so far as his battery is fully charged but his motor is just pulsing and not reaching full power, any ideas he can try?

He's rebound his tax.

Denis Watkins30/04/2019 14:17:34
3879 forum posts
60 photos

Timing Cliff

Look up Timing in his makers instructions

Cliff 195930/04/2019 16:26:14
260 forum posts
58 photos

Forgot to say it's a foamy he hasn't flown for a year but it was fly just fine when last flown.

Colin Carpenter30/04/2019 16:38:00
556 forum posts
35 photos

Could be cogging .Seen this several times recently and was dodgy connectors on motor or ESC ! Colin

Alan Thorpe30/04/2019 17:16:31
188 forum posts
61 photos

I had the same problem a while ago and everthing looked ok at motor and esc....but motor kept pulsing too. So I carefully stripped back a small patch of insulation with exacto blade on each of 3 motor wires so I could do continuity test as far as the esc connector.

Turned out one wire had open circuit just at connector but the heat shrink and insulation held it together so well, that it looked and felt perfect.

Resoldered it and everything was perfect.

Let us know how you get on.

Geoff Sleath30/04/2019 17:44:23
3365 forum posts
272 photos

It certainly sounds that one phase is open circuit either because of a broken connection as mentioned or a faulty esc (probably one of the output MOSFETs).


Outrunner30/04/2019 21:50:48
39 forum posts
2 photos

As above, probably a bad connection to one of the motor wires. Had it happen a couple of times, the first time it was intermittent, the heat shrink was the only thing holding the connector on the end on the wire.


Brian Hammond01/05/2019 16:05:36
299 forum posts

It could be a worn out lipo.

Steve Hargreaves - Moderator01/05/2019 17:04:33
6720 forum posts
189 photos

As the other chaps have mentioned it's probably a dodgy connection. Poor soldering of the motor connections would be my guess....

Cliff 195913/05/2019 09:24:17
260 forum posts
58 photos

Well it turned out to be the esc, tried another one and all is well. The connections by the way were all good so who knows?

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