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electric motor data- where?

Old 02-20-2008, 03:59 AM
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watt_the!
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Default electric motor data- where?

Hi All,

im on a search for brushed motors to suit a particular application and it seems that e car motors are very possibly the solution.

However- and a big however it is it seems..

I am finding it dumb founding that i cannot get motor information for many- the majority of motors available.

critical data like no load current, Resistance, rpm/volt, max current, max continuous current, current at max efficiency, max voltage, max power etc..

without many if not all of these i cannot design a system.

I am hoping that someone here can advise where i might find a comprehensive source and perhaps also explain how it is that motors without this info can be sold- and why would anyone buy them without this info?..

looking forward to your reply(ies).

cheers,
tim
Old 02-20-2008, 09:52 PM
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Adamg-RCU
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Default RE: electric motor data- where?

Why? Because the systems they are used in have already been designed. Consumers don't need to know that data.
Old 02-21-2008, 01:29 AM
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watt_the!
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Default RE: electric motor data- where?

huh?...thats like getting into a car not knowing whats under the hood and then getting annoyed cos it doesnt perform as you want..

consumers dont need to know the data?- how then do you select gearing, correct battery size, correct speed controller, estimate speeds for proper fairing and car dynamics, braking loads, cornering and suspension deflection, pinion size, differentials, belts, bearings..all of which rely on correct selection and sizing based on the motor itself..

i hope someone can answer my question as im starting to see why it isnt published...people arent putting much thought into racing fast...very strange considering its a competitive sport for many.
Old 02-21-2008, 08:40 AM
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Default RE: electric motor data- where?

you may have to contact the manufacturers, I do know that some of the data your looking for can be found on motors that are dynoed by the company like rpm/volt, torque, and efficency. But otherwise the stuff like the amp draw you'll need to ask the company that makes the motors, I've had to do that several times.
Old 02-21-2008, 01:16 PM
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Default RE: electric motor data- where?

I seem to remember all the D series brushed motors frm Trinity having a sticker on the side with all the information, curves and data you are looking for. Try finding a D6 (how many turns is your call).


Also, if theres a motor you have are looking for in particular you might be able to get the info off the net or a number of a manufacture to call (as racerj3 said)

hope this helps a little - j
Old 02-21-2008, 04:24 PM
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Default RE: electric motor data- where?

This whole industry is like that. Everyone seems to accept a turn rating as an accurate description of the motor and from there they seem to work on brand.

Iv'e been looking at finding details on the springs used in the shocks of different cars but ive found it's just not available. The turns, the length, material, thickness etc. Its just not part of this industry to get too technical in thier sales it seems.

If you do manage to find a good resource, do let us know !

Old 02-22-2008, 09:03 PM
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Default RE: electric motor data- where?

Welcome to RC. Once upon a time there was a book you could get with all the secrets but it is now out of print and very expensive on evil bay if you can find it. Try comparing one brand of tire to the next. Each company has their own scale so it is all trial and error. Same with motors. You pretty much see what the fast guy runs, buy it, Tweak the timing a bit, then wait to see what the next fast guy runs.
Old 02-22-2008, 09:12 PM
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Default RE: electric motor data- where?

haha

Seems like they dont dyno the motor and print the specs anymore. I am sure alot of people didn't care to read it but to alot of us... We needed that information to set our cars up right!
Old 02-22-2008, 09:18 PM
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Default RE: electric motor data- where?

No doubt. I am the same. I read the package and everything...lol. Seriously though I would love to see more data on this stuff and maybe an industry standard here and there so that you could compare before you buy. But then again maybe the manufactures know this and that is why they dont publish it.
Old 02-27-2008, 04:17 PM
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Default RE: electric motor data- where?


ORIGINAL: bobcat7811

Welcome to RC. Once upon a time there was a book you could get with all the secrets but it is now out of print and very expensive on evil bay if you can find it. Try comparing one brand of tire to the next. Each company has their own scale so it is all trial and error. Same with motors. You pretty much see what the fast guy runs, buy it, Tweak the timing a bit, then wait to see what the next fast guy runs.
well, you see it isnt like this in other rc forms like planes and helis and even boats.
plus all brushless motors are provided with specs.

also, ESCs work best when you can tweak them for the motor.

tires are a different kettle of fish, they arent critical to design of power train etc.

the thing is, motors are easy to spec. They dont need "dyno-ing" this is something only a glow motor benefits from. They can be measured on the bench for the basic characteristics..such an easy thing to do yet there seems to be very little info on them.

trial and error would seem an expensive and fruitless exercise given the dozens of products.

the standards are already available for e motor specs. Watching the fast guy also doesnt give much info...how do you know what bearings he's running, suspension setup, weight distribution, spring stiffness in front/rear/left/right and so on. Also how can you tell if it's just that he's a killer driver?

too many uncontrolled variables in using someone else as a gauge.

hence the conundrum.

im still amazed that the rc car community would accept this.

I guess ive hit a dead end by the sounds of it...very little chance of going through specs to match the application to an existing motor.

Thanks anyway guys.

Tim

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