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Post by peterboat on Jun 2, 2019 22:06:21 GMT
So I stripped the motor one bearing was very slightly iffy, armature was like brand new as were the brushes. I replaced the bearing and put the motor back together, first test run this weekend exactly the same as before! so all to no avail, bugger! I will have another play this week, but as I drove the boat hard yesterday and the motor was hot but not that hot I am not that worried about it
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Post by phil70 on Jun 3, 2019 6:50:13 GMT
Ref the whine, I've used electric FLTs and they've all had a whine. Perhaps it's just the nature of the beast. Chris whines sometimes but that's a different matter . Phil
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Post by peterboat on Jun 3, 2019 10:33:15 GMT
Ref the whine, I've used electric FLTs and they've all had a whine. Perhaps it's just the nature of the beast. Chris whines sometimes but that's a different matter . Phil If it whined all the time I would know that was it but it doesnt!! it starts after a few minutes a stop of only seconds removes it for a while as well, I am going into the hole in a minute to check battery voltages then I will run it until it whines in an attempt to hear where its coming from
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Post by phil70 on Jun 3, 2019 11:36:10 GMT
Yes that is odd. Phil
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Post by peterboat on Jun 3, 2019 12:00:10 GMT
Its coming from the motor and it doesnt matter whether its forward or reverse and its bloody annoying!! I will make time to check it out but for the moment I have other stuff to sort out
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Post by Jim on Jun 3, 2019 15:49:18 GMT
Its coming from the motor and it doesnt matter whether its forward or reverse and its bloody annoying!! I will make time to check it out but for the moment I have other stuff to sort out Can you use a sounding rod on different bits of the motor to narrow it down? For those who aren't familiar, a stick, rod or screwdriver placed on the motor and held against your ear.
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Post by peterboat on Jun 3, 2019 17:39:37 GMT
Its coming from the motor and it doesnt matter whether its forward or reverse and its bloody annoying!! I will make time to check it out but for the moment I have other stuff to sort out Can you use a sounding rod on different bits of the motor to narrow it down? For those who aren't familiar, a stick, rod or screwdriver placed on the motor and held against your ear. Jim I have a stethoscope, so I know exactly where the noise is coming from!! [an hour playing this afternoon] I still think its the bearings they are 62062RS which allegedly are an axial bearing, however just because the invoice says that, doesnt always mean its true!! They are supposed to be a deep groove bearing which is a slightly different part number so I will monitor the situation and buy the correct bearings for the job when I can get them at the right money!
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Post by phil70 on Jun 3, 2019 22:05:05 GMT
Peter,you have broken the internet... again Phil
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Post by peterboat on Jun 3, 2019 22:26:01 GMT
Peter,you have broken the internet... again Phil How?
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Post by phil70 on Jun 3, 2019 23:32:45 GMT
Peter,you have broken the internet... again Phil How? Your post above starts to turn blue for a couple of words and then ghosts out Phil
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Post by TonyDunkley on Jun 4, 2019 5:07:25 GMT
Can you use a sounding rod on different bits of the motor to narrow it down? For those who aren't familiar, a stick, rod or screwdriver placed on the motor and held against your ear. Jim I have a stethoscope, so I know exactly where the noise is coming from!! [an hour playing this afternoon] I still think its the bearings they are 62062RS which allegedly are an axial bearing, however just because the invoice says that, doesnt always mean its true!! They are supposed to be a deep groove bearing which is a slightly different part number so I will monitor the situation and buy the correct bearings for the job when I can get them at the right money! Could it be down to variations in end loading on the armature bearings due to thermal expansion of the armature and shaft as it warms up after a few minutes running, Peter ? With lower than normal radial loads and higher than normal thrust loading on the motor shaft, I wonder if it would be worthwhile swapping the deep groove ball bearings for an opposing pair of angular contact jobs, shimmed up to give a bit of end float when cold, . . or vice versa (to give them a bit of pre-load at cold) if the motor casing runs hotter than the armature/shaft ?
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Post by peterboat on Jun 4, 2019 9:04:11 GMT
Jim I have a stethoscope, so I know exactly where the noise is coming from!! [an hour playing this afternoon] I still think its the bearings they are 62062RS which allegedly are an axial bearing, however just because the invoice says that, doesnt always mean its true!! They are supposed to be a deep groove bearing which is a slightly different part number so I will monitor the situation and buy the correct bearings for the job when I can get them at the right money! Could it be down to variations in end loading on the armature bearings due to thermal expansion of the armature and shaft as it warms up after a few minutes running, Peter ? With lower than normal radial loads and higher than normal thrust loading on the motor shaft, I wonder if it would be worthwhile swapping the deep groove ball bearings for an opposing pair of angular contact jobs, shimmed up to give a bit of end float when cold, . . or vice versa (to give them a bit of pre-load at cold) if the motor casing runs hotter than the armature/shaft ? It could Tony, however the front bearing moves to stop that problem allegedly, I am going to look for tapered sealed roller bearings today, but fear that they might not be available. The problem is worse at 90 amps for some reason, below or above that the motor is smooth, their is end float so I am wondering whether the bearing I did not replace as it was very smooth with the same drag as the new one might be dodgy? The motor has a blower pushing air through it as well as the fan on the end, so it doesnt get hot, most of my cruising is in the 36-50 amps range so not a huge load, and interestingly whether I beast the boat or go gently it still takes about the same time for the whine to start, and at full chat the motor is doing 381 amps for the first two minutes [controller cuts back automatically]
If the weather is nice we will go out again this weekend and I will take my laser gun for temps to see whats happening, you are thinking like I am thinking with this problem so just maybe I will get it sorted
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Deleted
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Post by Deleted on Jun 4, 2019 12:09:35 GMT
Not prop noise is it?
You had the prop reprofiled if I remember right.
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Post by peterboat on Jun 4, 2019 21:42:27 GMT
Not prop noise is it? You had the prop reprofiled if I remember right. I wish! No the steth says its the motor, I checked the prop shaft where it comes through the hull, silent as the dead. I cant get the same size bearings in a taper config so that is out of the window so I will investigate the bearings again with a temp sensor
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Post by Deleted on Jun 4, 2019 21:49:33 GMT
If the motor is on direct drive to a prop plus you are over volting it then it is working quite a long way outside its design parameters. I can't remember the whole discussion but did you put in an intermediate bearing ? Maybe if you relieve the motor of some of the thrust load by using a plummer block it might sort it. Maybe you have already done this
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