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Forum Index : Electronics : Sourcing 24V Motor

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ryanm
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Joined: 25/09/2015
Location: Australia
Posts: 148
Posted: 11:34am 03 May 2020
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Hi Everyone,

I have a hillbilly (sorry, grazier) friend who wants me to sort the electrics for a diy drum seeder for a plow. I'm looking for a 24V ~750w motor and none of my usual online suppliers carry that sort of thing. Looked at Element14, L&H etc and can't find anything even close to suitable.

Wondering if anyone knows where I could source a unit at reasonable prices without going for the mystery dip on eBay or Aliexpress?
Edited 2020-05-03 21:40 by ryanm
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3267
Posted: 09:17pm 03 May 2020
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You get a choice, 1,700 or 3,000 rpm.
I have no idea how reasonable the price will be though.

http://www.alltorquetransmissions.com/front-page/product-page/abb-baldor/baldor-dc/general-purpose/12v-24v/[/URL
Cheers, Tony.
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3267
Posted: 09:23pm 03 May 2020
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I stuffed up the link and cannot edit it for some reason.
Try this:

http://www.alltorquetransmissions.com/front-page/product-page/abb-baldor/baldor-dc/general-purpose/12v-24v/
Cheers, Tony.
 
renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1566
Posted: 09:50pm 03 May 2020
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I have got stuff from motion dynamics before, they don't seem to have a 750w 24v though.
This is their biggest 24v

Plenty of other sellers that have scooter motors.

750w is pretty big, I got one of these for a project, damn hell that thing has some grunt.
Cheers Caveman Mark
Off grid eastern Melb
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3267
Posted: 10:18pm 03 May 2020
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Its a bit (ghetto engineering) but you could always couple up two smaller motors to run together. That may offer a lower cost solution.

The plan probably includes using pulleys or a chain anyway, so two motors should not present too much of a complication.
Cheers, Tony.
 
ryanm
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Joined: 25/09/2015
Location: Australia
Posts: 148
Posted: 11:58pm 03 May 2020
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Commercial unit I googled has a 1 HP motor on it so I figured that would be a solid choice. It's got to spin 3 x 44 gallon drums full of seed. Not all of which is light and fluffy like buffle.

Commercial unit also cost $13k. I recon I can rig up 3 drums and a motor with a fair bit of change left over.

Motion dynamics looks pretty good. Even if the motors blow every now and then they're cheap enough to keep a spare around.
 
Davo99
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Joined: 03/06/2019
Location: Australia
Posts: 499
Posted: 04:45am 04 May 2020
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With that sort of power the motors tend to also go to higher voltages.
There are a few options though.

A 48V 750W Motor:

24V 750W

At $485, not exactly what I would call Cheap.

Suggestion 1.

2x 500W 24V motors. These already have a sprocket and the chains and other sprockets are easy to get for electric Bikes etc.  Couple them up and you would have plenty of power.

24V 500W

Much more palatable at $148 for the 2.
I would be rigging up one to start and see how you go. If you gear the thing down so the load on the motor is reduced 500W may well be enough. If not and you are chain driving, very easy to add the 2nd Motor.

Suggestion 2.

Used motor :

24V 900W

$250 and a single unit.
Says it's off an electric Lawn mower. I had one of these once and it was a ball tearer.  Had it on a Small block chev Pump I made for pumping Veg oil. Worked great till someone I lent it to dropped it and smashed the magnet inside.

Suggestion 3

48V Motors. If you could up the voltage you would get the power you want much cheaper.

48V 750W

When you get up to 60V you can get 2 KW motors at reasonable cost.

Suggestion 4.

What about a conventional 240V Motor running off a 24V Sine wave Inverter?  
If your friend has a motor already suitable that will save you and even 2 Kw Inverters are not that exy now and may come in handy for powering other things as well.

There are a lot of motors on ebay. I'd like to find a high speed type around 18V to make an electric wheeled weed wacker for my father. They do  cordless versions but not with the wheels he needs for his back. A lot of the electrics are no lighter than the petrol versions and many are a lot heavier.
 
Warpspeed
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Joined: 09/08/2007
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Posts: 3267
Posted: 04:55am 04 May 2020
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Three 44 gallon drums full of seed sounds more like three motors to me.

That has quite a few advantages including redundancy if one motor craps out in the field during planting its not then a total disaster.

Also think about where you are going to get a direct replacement motor in five or ten years time...
Probably best to stick with a reputable name brand motor, even if it costs more initially.
Cheers, Tony.
 
ryanm
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Joined: 25/09/2015
Location: Australia
Posts: 148
Posted: 06:28am 04 May 2020
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Liking the look of the industrial worm gear motors from Motion Dynamics. Looking around their site I get the impression they know what they're talking about. I'll try for something with a standard mount I can replace easily later, but if not then it's not that hard to fabricate an adapter bracket, chains and sprockets come in standardized sizes.

Power is stuck at 24V because of the D6 pulling it.
 
renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1566
Posted: 06:54am 04 May 2020
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BTW with the 350w one here that I got, I ran it with this , the speed control was really good.
It's just hanging around ATM if you are close to Melb you can borrow it to play around with and see what it's capable of. Dunno where the sprocket went, I fitted a bar to it to operate a big set of bellows.
Cheers Caveman Mark
Off grid eastern Melb
 
ryanm
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Joined: 25/09/2015
Location: Australia
Posts: 148
Posted: 10:41am 04 May 2020
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Thanks for the offer Mark, but I don't like my chances of getting back into QLD at the moment.
 
BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 850
Posted: 07:04pm 04 May 2020
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How about a Fisher and Paykel type

Or  treadmill or wheelchair Motor

the wheelchair ones have a gear reduction built into them

I have all of them here including one like marks talking about it is on one of those small Electric motorcycle

I don't know how much shipping would be
But that is all it would cost you

If you would like me to unload a pic
let me know
 
Revlac

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Joined: 31/12/2016
Location: Australia
Posts: 345
Posted: 06:11am 05 May 2020
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@ryanm, would the Alternator on the D6 have enough power to run those motors?
There are a lot of large tractors and seeders here but have not seen a seeder with rotating drums.
Cheers Aaron
Off The Grid
 
nzfarmer
Newbie

Joined: 14/06/2019
Location: New Zealand
Posts: 4
Posted: 06:58am 05 May 2020
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Wheelchair motors will work but are more like 250w or less

Treadmill motors are DC and will run at 24v but most prefer higher voltages.

24v Forklift motors are very high amps if you can get  hold of one

I have a source of 375watt 12v 1750RPM motors that should do ok if you double the voltage - just check the heat output.  I can test for you if you want - they're $100 each, and come with an optional 30:1 reduction box.

Best solution probably a treadmill motor - use a boost converter to double up the voltage, and PWM controller to reduce the current/speed.
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3267
Posted: 07:25am 05 May 2020
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A lot of things like 24v truck and bus starter motors, winch motors, and fork lift motors probably all  have the necessary grunt, but are not continuously rated and may melt down fairly quickly.

Some of the really light duty stuff such a wheelchair motors, treadmill motors, fan motors and such, are designed for protected indoor use, and would not be entirely happy working for very long in pouring rain, or a wet muddy environment.

A proper heavy duty continuously rated industrial servo or traction motor made to work in mines or an agricultural or even a military environment, is going to be an expensive motor.

I don't think trying to do this on the cheap is going to be a good long term solution.
Cheers, Tony.
 
ryanm
Senior Member

Joined: 25/09/2015
Location: Australia
Posts: 148
Posted: 11:15am 05 May 2020
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  Warpspeed said  I don't think trying to do this on the cheap is going to be a good long term solution.


I agree, that's why I started the thread, didn't want to get some random motor off eBay.

Motion Dynamics has a 600W industrial unit that looks good to me when set up with a wormdrive down to around 10RPM. Probably a thousand dollars with controller, heavy duty wiring, E stop etc. Monster weighs 16kg. I think that would be under very little load turning the drums, but better to have a big motor idling than a little one flogging it's guts out. The dozer probably cost at least quarter of a mil, so a thousand dollars is pretty well bought.

Before we go spending money I think it would be wise to track down a neighbour and take a few snaps of a setup that has been working well for a few years. They're not uncommon in Queensland. Will be attached to a cutter bar which is tearing up the ground as well so I think a bit of thought into a vibration isolated mount wouldn't go astray.
 
BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 850
Posted: 07:53pm 05 May 2020
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I think the greats think things through before thay speak

People like me try to Stir It Up and get things moving

People like them straighten things out and keeps them moving in the right direction

My life was full of opportunitie and success because I humbled myself and listened to the greats

Problem is most are blinded and cant see through their arrogance

So we fall off the cliff over and over
again

While the wise watch and wait hopeing
the next fall will humble us enough just slow down and listen

Our people die because of the lack of wisdom!

This saving wisdom is around but we give it no value never take time to shut our mouths sit down and listen

I am sorry I went of topic

I just fill this is the key

So simple find this key and it opens the door to everything!!!

Have a blessed day
 
renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1566
Posted: 10:09pm 05 May 2020
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  ryanm said  ..........
I think a bit of thought into a vibration isolated mount wouldn't go astray.

Something like this perhaps?
Cheers Caveman Mark
Off grid eastern Melb
 
Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 3267
Posted: 11:28pm 05 May 2020
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  ryanm said  
Before we go spending money I think it would be wise to track down a neighbour and take a few snaps of a setup that has been working well for a few years. They're not uncommon in Queensland. Will be attached to a cutter bar which is tearing up the ground as well so I think a bit of thought into a vibration isolated mount wouldn't go astray.

Yup absolutely.

When designing anything from scratch yourself, a good first step is always to take a very long look at what other manufacturers are doing, and learn about what is good and what any problems may have been.  
Then try to do it better, shamelessly stealing all their good ideas and experience.
This goes on all the time in industry at all levels.

Even to the extent of using the exact motor and gearbox (purchased as a spare part) from an existing successful commercial seeding machine.
Cheers, Tony.
 
renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1566
Posted: 06:29am 18 Jun 2020
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Any progress?
I love a good farm build, I used to run sheep and needed to make/ fix crap all the time.
Cheers Caveman Mark
Off grid eastern Melb
 
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