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Author Topic: 24 volt motor, this any good?  (Read 5787 times)

Guy Bagley

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Re: 24 volt motor, this any good?
« Reply #25 on: November 14, 2016, 02:08:53 pm »

smiths 12v automotive motors ( for car fans ) are very good....,torquey  and cheap too.... just google it...


i deal for throwing a large prop and ideal for a tug
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #26 on: November 14, 2016, 02:30:11 pm »

thanks Guy Bagley, will have a look now :)
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #27 on: November 14, 2016, 08:49:23 pm »

I had a look but none of them give specs such as RPM & power etc :(


But i did find this that may well be just what i'm looking for, Prop-Shop recommended i needed a motor with around 500watt of power with a speed range of 1000 to 3000 rpm.. so i found this..


Here's the specs for it, its basically 24v 3000rpm 450 watt
http://shop.mat-con.net/E-Motor-Unite-MY7618-450W-24V-143Nm-with-sprocket


and heres a quick vid i found on youtube of it:
https://www.youtube.com/watch?v=lGh9SRgdwrg


The downside, is the shaft is 10mm & i've not found a coupling that's larger than 8mm, although mobile marine models state they can make any coupling size to order & id also need to make a mount for it. Its also quite expensive (about £90 + custom coupling).


So i think at this point, i'm going to buy the "cheapo" one off ebay that i mentioned earlier in topic & give that a go, if it works then great, but if it don't then i'm guessing this will be the bad boy i will need to get, but MMM also do a 24v motor which i'm guessing is what they supply with there FTX Tug which is just a tad smaller than my Tug im going to build, so i've dropped them an email asking about specs etc as this would be a wiser choice as MMM also sell the bracket & couplings etc to match so will make my life much simpler in terms of the build! :)
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derekwarner

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Re: 24 volt motor, this any good?
« Reply #28 on: November 14, 2016, 09:09:53 pm »

With power curves like these :o....& being a tug, you could tow a barge with a 1000W portable gen set mounted in the barge....... %) ....

Running time would then be dependent on the reserve petrol tank for the gen set.........Derek
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jarvo

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Re: 24 volt motor, this any good?
« Reply #29 on: November 14, 2016, 09:20:12 pm »

Hi mate, The main thing being, what are you going to do with your tug????  Towing etc will need the extra power, if its just stooging around then possibly lower power, i follow Stavro's formula with extra power you just throttle back. 


The spec from the ebay shop shows 450 watts @ 3000rpm, not far short from propshop 500 @ 3000.


Unless you have a scrapyard nearby a heater blower motor or radiator fan motor would be superb for power, torque and watts. they are fairly big but tugs have big hulls. If you can get a cheap blower motor ie less that the ebay motor, go that way,


Hope this helps


Mark
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #30 on: November 14, 2016, 09:20:27 pm »


Hi derekwarner_decoy :)

lol your post made me chuckle!  ok so i'm guessing that motor is overkill! :(

I will see what MMM get back to me with about the 24v motor they sell, but like i say in mean time (for the sake of £20) i will get the one off ebay & give it a shot :)
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jarvo

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Re: 24 volt motor, this any good?
« Reply #31 on: November 14, 2016, 09:23:44 pm »

If i am reading Decoys graph right that motor is using 25amps at full power, go for the blower motor they use a lot less. test your car motor with an ammeter, that will show how little they take


Mark
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #32 on: November 14, 2016, 09:27:08 pm »

Hi mate, The main thing being, what are you going to do with your tug????  Towing etc will need the extra power, if its just stooging around then possibly lower power, i follow Stavro's formula with extra power you just throttle back. 


The spec from the ebay shop shows 450 watts @ 3000rpm, not far short from propshop 500 @ 3000.


Unless you have a scrapyard nearby a heater blower motor or radiator fan motor would be superb for power, torque and watts. they are fairly big but tugs have big hulls. If you can get a cheap blower motor ie less that the ebay motor, go that way,


Hope this helps


Mark


Hiya mark :)


Well, to be honest *most* of the time i will just be chugging around local areas, but i'm hoping to join a club & then who knows :) ..so ideally i would want to get it correct from the go so if i do decide to do some tugging then my tug will be ready :)


Ive had a look on ebay for fan motors but none give any specs & all of them seem to only come with the actual fan, which is no biggy as i will just remove the fan :) but without any specs at all i have no idea if i would be buying the right one.


Aye the 450 watt one with 3000rpm seems to fit the bill nicely but id need to somehow have to make a mount for it & make sure that MMM would be able to make a coupling to accommodate the 10mm shaft.


What sort of run times could i expect from a 20ah battery as that would be my next issue! ..i dont want my batt to go flat within 30mins of using it lol :(


Thanks again :)
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #33 on: November 14, 2016, 09:28:23 pm »

If i am reading Decoys graph right that motor is using 25amps at full power, go for the blower motor they use a lot less. test your car motor with an ammeter, that will show how little they take


Mark


ahh oki doke, i had a feeling with that sort of watt it be way too much in terms of battery drain!


ok i will have another look for one of these blower motors on fleabay! :)
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #34 on: November 14, 2016, 09:32:43 pm »

ok looking on ebay, ive managed to find a few specs off a couple, but they are very vague...


basically they are 80watt which i'm guessing be far too low as the other 24v motor i was looking at earlier was 150watt?
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #35 on: November 14, 2016, 09:39:44 pm »

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derekwarner

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Re: 24 volt motor, this any good?
« Reply #36 on: November 14, 2016, 09:48:05 pm »

Well.....tizdaz asks........

"What sort of run times could i expect from a 20ah battery as that would be my next issue! ..i don't want my batt to go flat within 30mins of using it%)

I am sure one of our Black Art members will come back and confirm your proposed motor drawing 25 amps will be running at about 1/3 of input power [8 volts?] after 26.3 minutes from your 20A/H lead acid battery..... following on, after 42.7 minutes the battery will either be dead or explode  <*< from internal overheat/fusion

These [accumulators  {-)] lead acid batteries do have duty cycles....have you considered consulting such text/tables?

PS...I have acknowledged on many occasions that my knowledge of electrons and such is limited {-) .......

The following ready reckoner suggests a for a 12 Volt application, a 20 amp load for 1 hour using a wet cell would require a 96 AH supply...... Derek

https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwiHk7uenanQAhVBtJQKHZP1D3IQFgg2MAU&url=https%3A%2F%2Fwww.batterystuff.com%2Fkb%2Ftools%2Fcalculator-sizing-a-battery-to-a-load.html&usg=AFQjCNEOljXTpOkDM9VFK7gFRDfp3IMaUg
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tizdaz

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Re: 24 volt motor, this any good?
« Reply #37 on: November 14, 2016, 09:55:13 pm »

Well.....tizdaz asks........

"What sort of run times could i expect from a 20ah battery as that would be my next issue! ..i don't want my batt to go flat within 30mins of using it%)

I am sure one of our Black Art members will come back and confirm your proposed motor drawing 25 amps will be running at about 1/3 of input power [8 volts?] after 26.3 minutes from your 20A/H lead acid battery..... following on, after 42.7 minutes the battery will either be dead or explode  <*< from internal overheat/fusion

These [accumulators  {-) ] lead acid batteries do have duty cycles....have you considered consulting such text/tables?

PS...I have acknowledged on many occasions that my knowledge of electrons and such is limited {-) ....... Derek


lol :(


all i want to do is find a motor to run my tug, i don't have a degree in amps or watts etc, its all new to me! :( i had no intention of looking for a motor with such high watts, it was prop-shop who recommended that type of motor!


I think for now im just going to go with the one off ebay.. 24 volt/3000rpm & 150 watt :) ..will also wait to see what MMM say about the 24v motor they also sell & take it from there :)


Ah also, the one on ebay come supplied with a gear on the shaft, are these easy to remove..i did send the seller a message but lets just say he didnt have a clue!
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jarvo

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Re: 24 volt motor, this any good?
« Reply #38 on: November 14, 2016, 11:27:05 pm »

Hi mate, try a ford fan, they take about 20amps with the huge fan so would expect about 8 - 10 with a prop. go to a scrap yard they will do one for about £10, plenty of power, and revs, probably about 2500 - 3000. with masses of torque.


Mark
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NFMike

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Re: 24 volt motor, this any good?
« Reply #39 on: November 15, 2016, 09:10:50 am »

There is some sloppy talk about car fan motors. Years ago there was only one - the heater fan, typically a 2-3 Amp job and often used for models. Windscreen wiper motors are usually similar. Nowadays almost every car (even in the scrappers) has a radiator fan too - usually 10 Amps and up. I assume the one jarvo suggests is the latter.
For anyone considering these make sure you know which one you want before shopping or you have a 50% chance of getting the wrong type.

One other point to be aware of is that fan motors are cooled by the airflow they create. Buried in a boat they will run hotter. In most cases they would only be using a portion of their full power, so this won't be a (big) problem, but if you expect to push it harder then some engine room ventilation may be in order.
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