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Re: Help Finding 24V motor [Re: DriveHard] #5199561 08/29/19 07:37 AM
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benjayman227 Offline
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Even if you can find a motor, that 150 amp number is hard to get around from a systems perspective. What's the proposed duty cycle/load factor of the setup? With that much current, everything in the current path tends toward looking like a space heater, if not a fuse. Things like resistance of terminal connections matter, not to mention the heinous requirements of any relays/contactors, OCPD, etc. You get power dissipation EVERYWHERE.

24V 150A, or 240V 15A, I know what I'd be shooting for. Voltage is not your enemy in this case.

Love to see what power supply is backing this as well.

You might try looking for 3-phase motor/controller combos that take DC power input. I used one of these (96V nominal) successfully in a Formula Hybrid car in college. Speed control is a simple pot input.

Re: Help Finding 24V motor [Re: DriveHard] #5199587 08/29/19 08:00 AM
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DriveHard Offline OP
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Intermittent duty cycle at best...let's say 45 seconds to a minute of use...then silent for quite some time.


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Re: Help Finding 24V motor [Re: benjayman227] #5199593 08/29/19 08:10 AM
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DriveHard Offline OP
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Originally Posted by benjayman227
Even if you can find a motor, that 150 amp number is hard to get around from a systems perspective. What's the proposed duty cycle/load factor of the setup? With that much current, everything in the current path tends toward looking like a space heater, if not a fuse. Things like resistance of terminal connections matter, not to mention the heinous requirements of any relays/contactors, OCPD, etc. You get power dissipation EVERYWHERE.

24V 150A, or 240V 15A, I know what I'd be shooting for. Voltage is not your enemy in this case.

Love to see what power supply is backing this as well.

You might try looking for 3-phase motor/controller combos that take DC power input. I used one of these (96V nominal) successfully in a Formula Hybrid car in college. Speed control is a simple pot input.


The industry this machine operates in is standardized as 24V - source is a bank of lead acid batteries
The machine today operates between 150-200 amps...but as on/off
Our goal is to distribute the power between multiple sources instead of one source, and make everything variable instead of on/off
Duty cycle is intermittent at best. The machine spends much of its life sitting still. The particular function of the machine I am working on will operate for 45-60 seconds at best, then have plenty of time to resume to ambient.
Peak load is about 150 amps to get the load going...then settles to 80-100 amps.


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Re: Help Finding 24V motor [Re: mk378] #5200075 08/29/19 05:53 PM
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CR94 Offline
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Originally Posted by mk378
... Running a motor on less than rated voltage the hp is likely to drop by at least voltage squared, i.e. 1/4 the power for 1/2 the voltage.
Yes. About half the starting torque and half the no-load speed, too, for a basic brush motor.


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Re: Help Finding 24V motor [Re: DriveHard] #5210006 09/11/19 10:40 AM
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DriveHard Offline OP
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Looks like I'm going to run two of these in tandem to accomplish my requirements.
https://www.amazon.com/AmpFlow-F30-150-Brushed-Electric-Motor/dp/B00ZGII96S?ref_=fsclp_pl_dp_10

And control them with something like this...
https://www.ebay.com/itm/300A-200V-72V-96V-144V-DC-motor-speed-controller-PWM-current-limit-RS232-Arduino/172668870882?hash=item2833dde0e2:g:zHwAAOSwVRxb8exZ

I appreciate the help!


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Re: Help Finding 24V motor [Re: Rand] #5210059 09/11/19 11:46 AM
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MolaKule Offline
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Hopefully, it has the starting torque and reliability requirements you need.



Originally Posted by Rand
With that much information given its pretty hard to find anything that would be remotely helpful to you.



It appears the OP has found his answer so we'll close this thread.

Last edited by MolaKule; 09/11/19 11:49 AM.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
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