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Post by Deleted on Mar 28, 2017 20:21:30 GMT
I'd really like to belt a large brushless DC motor to the propshaft between the gearbox and the stern tube. Using a toothed drive belt.
What I would like to know is would this damage the gearbox? Its a prm 160 hydraulic box.
It'd be nice to be able to rig up a low power in line hybrid electric drive for slow speed maneouvering.
But I don't want to screw the gearbox. I would put plummer bearings each side of the pulley to deal with side loading.
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Post by Deleted on Mar 28, 2017 20:25:51 GMT
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Post by kris on Mar 28, 2017 20:26:42 GMT
I would have thought if the gearbox is in neutral when running the electric motor it would be okay.
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Post by Deleted on Mar 28, 2017 21:03:45 GMT
Yes it would be in neutral. I'n just wondering if the gearbox has a lubrication pump run off the input. It used normal engine oil and has piston operated clutch packs so maybe the gears and bearings are just splash lubricated? I don't really know. Would be bad to wreck it
It looks like this is what they do in hybrid marine units but I think they might take the gearbox out of the equation with an extra clutch which disengages it when electric is operated ?
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Post by kris on Mar 28, 2017 21:10:11 GMT
It would be really good if it could generate electricity when running off the engine. I'm pretty sure that your gearbox would be okay if in neutral because it would only be the output shaft spinning.
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Post by Deleted on Mar 28, 2017 21:26:34 GMT
Hybrid marine do a system which will turn the motor into a generator but it is stupidly expensive.
That would be the ideal arrangement but it is only half of engine speed due to 2:1 gearbox and would require extra electronics.
I think a large alternator in the conventional position on the engine might be more realistic and reliable and also cheaper.
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Post by TonyDunkley on Mar 28, 2017 22:01:33 GMT
I'd really like to belt a large brushless DC motor to the propshaft between the gearbox and the stern tube. Using a toothed drive belt. What I would like to know is would this damage the gearbox? Its a prm 160 hydraulic box. It'd be nice to be able to rig up a low power in line hybrid electric drive for slow speed maneouvering. But I don't want to screw the gearbox. I would put plummer bearings each side of the pulley to deal with side loading. The PRM 160 box is designed to "trail" indefinitely without harm to any of the internals, such as when installed in something like a motor-sailer and sailing with the engine turned off, so you're not going to do it any harm with short periods of operating an electric motor driving the tailshaft via a belt. |
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Post by JohnV on Mar 29, 2017 8:14:20 GMT
My only comment will be that something else alien about the motors is the spec. ....... power 7,000 watts ...... max current 150A ........ max volts 180v ? pwr = V x A 180v x 150A = 27kw .....hmmmmm let's try the other way 7,000 watts divided by 150A ...... = 46.7v hmmmm again !!! |
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Post by peterboat on Mar 29, 2017 8:24:50 GMT
I bought a agni motor to do this on my old boat, Cedric Lynch made the motor and allegedly his are the best in the world, I never bothered as I bought my new boat that year.
I am going to put it into my broads cruiser this year as a full electric boat, have a look on the EBA website and ebay as proper electric motors do come up quite cheap at times
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Post by kris on Mar 29, 2017 8:31:41 GMT
I hope you are going to keep us updated Peter, as it sounds an interesting project.
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Post by peterboat on Mar 29, 2017 8:36:41 GMT
I hope you are going to keep us updated Peter, as it sounds an interesting project. I will, I am doing it for a bit of fun but can see that it is the future and with solar should be a cheap cruising boat |
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Post by kris on Mar 29, 2017 8:38:59 GMT
I hope you are going to keep us updated Peter, as it sounds an interesting project. I will, I am doing it for a bit of fun but can see that it is the future and with solar should be a cheap cruising boat its always interested me, so I look forward to seeing your project progress. |
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Post by Deleted on Mar 29, 2017 9:14:48 GMT
My only comment will be that something else alien about the motors is the spec. ....... power 7,000 watts ...... max current 150A ........ max volts 180v ? pwr = V x A 180v x 150A = 27kw .....hmmmmm let's try the other way 7,000 watts divided by 150A ...... = 46.7v hmmmm again !!! I read it as about 7kw at 48v. Not sure what the other figures are it does seem odd. The power to cost ratio of these motors is good. I use a 63mm brushless motor in my kayak and it is very efficient and powerful if required. Yes they are hobby grade but I think it is the cheapest way to test the concept to see if it works. I like electric boats but I do think the diesel is still king for a cruising vessel. Its for my 40x9ft steel inspection launch. Its a heavy boat but very easily propelled as has fine underwater lines. |
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Post by Deleted on Mar 29, 2017 9:15:15 GMT
I'd really like to belt a large brushless DC motor to the propshaft between the gearbox and the stern tube. Using a toothed drive belt. What I would like to know is would this damage the gearbox? Its a prm 160 hydraulic box. It'd be nice to be able to rig up a low power in line hybrid electric drive for slow speed maneouvering. But I don't want to screw the gearbox. I would put plummer bearings each side of the pulley to deal with side loading. The PRM 160 box is designed to "trail" indefinitely without harm to any of the internals, such as when installed in something like a motor-sailer and sailing with the engine turned off, so you're not going to do it any harm with short periods of operating an electric motor driving the tailshaft via a belt. Thanks for that  |
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Post by kris on Mar 29, 2017 10:57:15 GMT
I'd really like to belt a large brushless DC motor to the propshaft between the gearbox and the stern tube. Using a toothed drive belt. What I would like to know is would this damage the gearbox? Its a prm 160 hydraulic box. It'd be nice to be able to rig up a low power in line hybrid electric drive for slow speed maneouvering. But I don't want to screw the gearbox. I would put plummer bearings each side of the pulley to deal with side loading. The PRM 160 box is designed to "trail" indefinitely without harm to any of the internals, such as when installed in something like a motor-sailer and sailing with the engine turned off, so you're not going to do it any harm with short periods of operating an electric motor driving the tailshaft via a belt. is that the same for all prm gearboxes? |
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