Degsy Posted September 5, 2015 Share Posted September 5, 2015 (edited) Hoping to tap into the vast knowledge on here. The single phase Brooks 3hp electric motor on our compressor has overheated and presumably requires rewinding but it appears that it would be cheaper to replace it with a new and much more modern motor. Modern motors are much smaller and lighter than the old Brook motor but with some modification to the mountings a modern one could be fitted. Any expert opinion and advice would be very welcome. Incidentally I have enquired for rewinding costs and it appears that a new motor of the same power etc albeit a much lighter build would be the cheapest but would it be the best option? Edited September 6, 2015 by Degsy Quote Link to comment Share on other sites More sharing options...
gas 44 Posted September 9, 2015 Share Posted September 9, 2015 My first thought would be why has the motor burnt out. If the problem is some where else rewinding or replacing the motor could be futile. On the other hand if its just age related then IMHO new motor's are lighter/cheaper but not as good as the older one's once rewound. 3 h/p is quite large for single phase could you not use 3 phase.? Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted September 9, 2015 Share Posted September 9, 2015 Hmm, overheated? burnt out or just hot? It could be umpteen years of dust and no cleaning that caused it. A BCP motor should last a long time, and would be worth a rebuild - it might just need a clean, re-cut commutator, and some bearings. New far-eastern motors look nice, and work well - for a short period. :angel: Quote Link to comment Share on other sites More sharing options...
Degsy Posted September 10, 2015 Author Share Posted September 10, 2015 The motor is not burned out but if run it immediately overheats. Unfortunately in this area we don't have the option of 3 phase supply. Gordon,your thoughts regarding dust confirm what I have been suspecting, unfortunately our local so called rewind specialist doesn't want to know and just wants to supply a new motor. At the moment this job is on the back burner as we are working night and day to finish harvest before the rain comes tomorrow night. It now looks like a trip to Liverpool next week where there are several rewind companies. Thank you both for your helpful comments. Quote Link to comment Share on other sites More sharing options...
MB1944 Posted September 11, 2015 Share Posted September 11, 2015 Try JB Rewinds in Widnes 0151 420 2934 they have done a lot of work for me and are very reliable. Quote Link to comment Share on other sites More sharing options...
Degsy Posted September 11, 2015 Author Share Posted September 11, 2015 Try JB Rewinds in Widnes 0151 420 2934 they have done a lot of work for me and are very reliable. Thanks, will make them first port of call. Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted September 11, 2015 Share Posted September 11, 2015 If you can run it for five minutes and get up some air - blow the casing out as well as you can, though I appreciate that some of them are not the most accessible ....:cheesy: Quote Link to comment Share on other sites More sharing options...
gas 44 Posted September 11, 2015 Share Posted September 11, 2015 I dont want to state the obvious but this is an electric motor. Its a natual source of heat even if running efficiently I'm an ex qualified sparks, the amount of problems caused by "tinkering" horrifies me sometimes. Get it some where that a GOOD rewind company can have a look, they will understand the quality of a British motor. Please do not be tempted by the cheap and "nasty" far eastern "snake oil" Quote Link to comment Share on other sites More sharing options...
Degsy Posted September 11, 2015 Author Share Posted September 11, 2015 I dont want to state the obvious but this is an electric motor. Its a natual source of heat even if running efficientlyI'm an ex qualified sparks, the amount of problems caused by "tinkering" horrifies me sometimes. Get it some where that a GOOD rewind company can have a look, they will understand the quality of a British motor. Please do not be tempted by the cheap and "nasty" far eastern "snake oil" We have no intention of tinkering with it, as I said in a previous post it will, hopefully be going to a rewinders next week for examination. I will report back in due course. Quote Link to comment Share on other sites More sharing options...
Diana and Jackie Posted September 12, 2015 Share Posted September 12, 2015 Presuming its capacitor start - which it usually is for an AC single phase 3HP electric motor have you had the capacitor checked? Equally there was on older motors a centrifugal switch at the rear of the motor which can stick or has burnt contacts. Diana Hoping to tap into the vast knowledge on here. The single phase Brooks 3hp electric motor on our compressor has overheated and presumably requires rewinding but it appears that it would be cheaper to replace it with a new and much more modern motor. Modern motors are much smaller and lighter than the old Brook motor but with some modification to the mountings a modern one could be fitted. Any expert opinion and advice would be very welcome. Incidentally I have enquired for rewinding costs and it appears that a new motor of the same power etc albeit a much lighter build would be the cheapest but would it be the best option? Quote Link to comment Share on other sites More sharing options...
Degsy Posted September 12, 2015 Author Share Posted September 12, 2015 Presuming its capacitor start - which it usually is for an AC single phase 3HP electric motor have you had the capacitor checked? Equally there was on older motors a centrifugal switch at the rear of the motor which can stick or has burnt contacts. Diana As it runs a compressor it's a capacitor start/capacitor run type and no it has not been checked, there doesn't appear to be a centrifugal switch but as I said previously it will be going to a rewind company as soon as time allows. Quote Link to comment Share on other sites More sharing options...
Degsy Posted November 21, 2015 Author Share Posted November 21, 2015 The motor is now back from the rewinders and is working fine. I had considerable difficulty finding a company willing to do the work at a fair price, their only real interest was in supplying cheap far eastern rubbish that they quite openly admitted would only last for a couple of years. The real mystery about this is that the fault was caused by water ingress although the motor has always been used/stored in a dry environment. Quote Link to comment Share on other sites More sharing options...
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