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compressor motor

S

shaunuss

Junior Member
Hi ive been given a compressor but it needs a motor the side says its a beaver magnum but I cant find anything on this the tank is 110ltrs working pressure 12 bar im sure its a single stage pump I would like to know if anyone knows what size motor I should use im wanting a single phase and running it from house electrics il be running standard tools like sanders wrench spray gun but not all at once but would like a decent amount of cfm thank you in advance shaun
 
no im English I want 240v sorry I should have said I don't know what would be best as I don't want to put a motor on it that will be be inadequate
 
Are you sure it's single stage? Single stage gets pretty rough past 125PSI, and you're asking for 175PSI. Is the engine and pump integral or is it an electric motor running a pulling to the compressor unit?
 
its an electric motor and obviously needing a belt to connect the two maybe it would help if I put a picture of it up
 
i'd look for a similar compressor to get the rpm/horsepower ratings

you have the original motor pulley and a belt right?
 
Ok, you're going to want a 5HP motor as an absolute minimum. That should make you good for 12-14CFM. A 10HP would get you closer to the 30ish range CFM. But at 10HP you'll need a solid 60A of 230V to start a motor like that.
 
yh I think 10hp would be too much on house electrics prob trip thm out I cant get a pic up but if you recommend a 5hp would give 12-14 safely with electrics il prob look for something around that as a minimum I don't want it to burn out or struggle filling tank or il be just needing to replace it I may aswell get something tht will do job properly first time and it didn't cost me so im saving really with just buying a motor thanks for your quick replies and help
 
You'll still want a good 25A @ 230V to start a 5HP motor. Make sure you have a circuit rated for that. Make sure to buy a motor with capacitor start. They aren't much extra money but they do a good job not browning the house out. Without it, you'll need alot more power for start up.
 
Good luck finding a 5 hp single phase motor! Most UK industrial suppliers only provide 5 hp motors @ 400V 3ph, and a single phase would need to be a special order.

If you don't know the speed of the motor, then go for a 1500 rpm motor. If the compressor needs 3000 rpm, then it will still work, you just won't get as many CFM.

If you are completely lost and need to find a motor "blind", then you won't go to far wrong with a 3 hp - 4 pole motor.
 
ive seen a motor on ebay it says its a 240v 3hp 3000rpm 25mm shaft keyway would this be suitable for my compressor if it would how much amps would it need and or do I need to be asking certain questions before I fork out any money thank you for your help and replies I am new to this as my old compressor was a small 25ltr portable thing that was all in one unit and looks like the motor wont split from its pump
 
Before any serious help can be given:

1) Pictures of the setup. Details of the compressor and tank and details of the drive type.
2) Details on the power available to you, voltages, phases available, free or dedicated breaker spots, and main breaker rating
3) Available motor mounting pattern(s) near the compressor.
4) Complete sentences with some semblance of punctuation. It's damn near impossible to read your solid blocks of text.
5) What CFM requirements do your intended tools require?

If you can't answer 1-3+5 after some work (not necessarily off of the top of your head) you have little or no business trying to setup a compressor motor. Once you know 1-3+5 we can provide good suggestions on how to proceed, anything less than that and you could get into quite a bit of trouble.

I have a 5hp/80gallon 2-stage compressor rated for around 16CFM. It's enough to run virtually any of my tools continuously (I have an impact gun, palm sander, and a low-pressure air-blast for my CNC router). This is about as small as I've seen for real automotive paint spraying as well. This setup requires a dedicated 50A/240V circuit, which is ostensibly half of the 100A service in my garage. I have had this compressor wired into a house before and it caused minor brown-outs when it was kicking over despite being on a completely new sub-panel with either 100A or 200A service.

Getting everything setup properly is not trivial given what I *think* your intended usage is. Please sort out answers for 1-3 and 5 and we'll go from there.
 
As for a reply I did try to put some pictures up but it was asking for a URL for the image.
The set up I am using was put at the beginning of this thread as it a basic set up for my home garage so will be using the house standard house electrics I am not an electrician.
The compressor was given to me free of charge and the motor had already been removed previously to me receiving it.
So to answer all that you have asked I will only be doing small mechanics in my own standard size car garage that is built in my homes garden. Now to put all this together I am not a qualified mechanic just someone who wants to save a few pounds in garage fees and was only what I thought was asking a simple question as to what motor would be adequate without burning house electrics.

As for having to put everything into full sentence's, paragraph's and proper punctuation I didn't think I was having an English grammar lesson I thought I was using a forum for a little help.

Now that I have fully stated all I think you have asked and as it shows I can use it if I need to but didn't think I had to. Just for your information I have actually got a certificate from college for level 3 word processing plus other certificates for ECDL all this is actually irrelevant to what I was asking but just making a point. Don't bother putting an answer as I will be removing my profile and going elsewhere as I took your reply a little insulting to my intelligence.
 
shaunuss said:
As for a reply I did try to put some pictures up but it was asking for a URL for the image.
The set up I am using was put at the beginning of this thread as it a basic set up for my home garage so will be using the house standard house electrics I am not an electrician.
The compressor was given to me free of charge and the motor had already been removed previously to me receiving it.
So to answer all that you have asked I will only be doing small mechanics in my own standard size car garage that is built in my homes garden. Now to put all this together I am not a qualified mechanic just someone who wants to save a few pounds in garage fees and was only what I thought was asking a simple question as to what motor would be adequate without burning house electrics.

As for having to put everything into full sentence's, paragraph's and proper punctuation I didn't think I was having an English grammar lesson I thought I was using a forum for a little help.

Now that I have fully stated all I think you have asked and as it shows I can use it if I need to but didn't think I had to. Just for your information I have actually got a certificate from college for level 3 word processing plus other certificates for ECDL all this is actually irrelevant to what I was asking but just making a point. Don't bother putting an answer as I will be removing my profile and going elsewhere as I took your reply a little insulting to my intelligence.
Click to expand...

1) I was just trying to help.

2) You answered none of my questions, just repeated what you had written earlier (which I did read through).

3) All of my questions were geared towards figuring out how to get you a compressor operating without trashing your home electronics.

4) I was not giving you an "English grammar" lesson. No offense was intended, I simply asked you to use complete sentences so that I and others could more easily understand your posts and thus offer better and more complete help.

If you found my post insulting I am sorry you feel that way. However, I was asking very specific and pointed questions to get the information required to get you up and running. If you didn't understand any aspects of what I was requesting, say so. I am more than happy to clarify and walk you through what you need to look for. However, if you can't go to your home or garage breaker panel and figure out what your main breaker is rated for and what free circuits you have (at a minimum) I do not think that you should be spec'ing, buying, mounting, and wiring what is probably the single most powerful device in your entire home. We are talking about a motor that requires electrical service with the current capacity of half of an entire house! One mistake, one short-cut, one honest moment of forgetfulness, and you could burn your house/garage down. It doesn't mean I think you're a bad or stupid person, but it does mean that you must be honest with yourself about your DIY abilities.
 
JCH13 said:
Before any serious help can be given:

1) Pictures of the setup. Details of the compressor and tank and details of the drive type.
2) Details on the power available to you, voltages, phases available, free or dedicated breaker spots, and main breaker rating
3) Available motor mounting pattern(s) near the compressor.
4) Complete sentences with some semblance of punctuation. It's damn near impossible to read your solid blocks of text.
5) What CFM requirements do your intended tools require?

If you can't answer 1-3+5 after some work (not necessarily off of the top of your head) you have little or no business trying to setup a compressor motor. Once you know 1-3+5 we can provide good suggestions on how to proceed, anything less than that and you could get into quite a bit of trouble.

I have a 5hp/80gallon 2-stage compressor rated for around 16CFM. It's enough to run virtually any of my tools continuously (I have an impact gun, palm sander, and a low-pressure air-blast for my CNC router). This is about as small as I've seen for real automotive paint spraying as well. This setup requires a dedicated 50A/240V circuit, which is ostensibly half of the 100A service in my garage. I have had this compressor wired into a house before and it caused minor brown-outs when it was kicking over despite being on a completely new sub-panel with either 100A or 200A service.

Getting everything setup properly is not trivial given what I *think* your intended usage is. Please sort out answers for 1-3 and 5 and we'll go from there.
Click to expand...

What brand/model compressor are you running? I've got a 5hp on my I.R. and it is rated around 20amps continuous and 25ish FLA. I'm on a 30A circuit and never had a problem. Other thing I wonder is if you have an unloader? I have and have never had any line drop/brown out or slow start.
 
Can't say 100% but it sounds like you have this one:
It says on Amazon UK it takes 230V at 13Amps
No specs on the motor, but in the Photo it does show a Tel # amac power products 01904 400424 for the company (may or may not be a good number)
http://www.amazon.co.uk/compressor-MC1198-410-50c-SINGLE/dp/B001KZKKJA

614mfXf5NiL._SL1280_.jpg
 
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Jerem said:
What brand/model compressor are you running? I've got a 5hp on my I.R. and it is rated around 20amps continuous and 25ish FLA. I'm on a 30A circuit and never had a problem. Other thing I wonder is if you have an unloader? I have and have never had any line drop/brown out or slow start.
Click to expand...

I've got a Quincy two-stage compressor with an unloader (that does work!) The closest modern equivalent is this guy: http://www.aircompressorsdirect.com...n=251CP80VCB&gclid=CLqdnoHphsICFUUF7AodoRcANg

My compressor has been 'in the family' for almost 25 years and that exact model isn't online. Note that the one above suggests a 60A breaker and draws 28A under full load, my manual suggests a 50A breaker. This likely has to do with the particular type of motor. Yours is probably a cap-start cap-run motor, which requires less startup current and less running current, but has many more points of failure than a simpler motor like mine.
 
Well, mine has a few years on it too. I bought it for the shop 20ish years ago. Replaced it with a Quincy rotary about 5 years ago and brought the I.R. home for the workshop. 15 years running all day every day and 5 years here at the house and never a single hiccup (but I have honed and re-ringed the pump twice). Yeah, I can live with those failure points, and as an added bonus it doesn't brown out the workshop.
 
Jerem said:
Well, mine has a few years on it too. I bought it for the shop 20ish years ago. Replaced it with a Quincy rotary about 5 years ago and brought the I.R. home for the workshop. 15 years running all day every day and 5 years here at the house and never a single hiccup (but I have honed and re-ringed the pump twice). Yeah, I can live with those failure points, and as an added bonus it doesn't brown out the workshop.
Click to expand...

That's good! I should be clear: mine doesn't brown-out my shop, it has a single 50A circuit with over-sized wiring driving it. When it was setup in a house prior it would make the lights dim briefly when it started up. It was wired properly, but the house is quite old (original structure deed is 1774!) and it was a 50A draw on a 60A sub-panel. Never blew a breaker or killed any equipment, but it was noticeable.
 
shaunuss said:
As for having to put everything into full sentence's, paragraph's and proper punctuation I didn't think I was having an English grammar lesson I thought I was using a forum for a little help.
Click to expand...

If you want help from others you should put a little effort into writing using a sentence structure that is comprehensible to those attempting to help you. It's more helpful than whining and not answering questions. Look around adult forums on the internet. Nobody writes like you.
 
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