Cc/neu Motors - Page 5 - RC-Monster Forums

08.18.2008, 12:03 PM

Patrick, what about Scorpion motors? They claim to have an N-50EH magnet in their motors. Built special by only 2 companies in the world. Can you get your hands on these magnets?

killajb · 08.18.2008, 12:24 PM

I'm not 100% sure, but I believe that is company Patrick was referring to (without calling out names) on the previous page.

Castle products are priced lower that most for the performance they offer in return. I think that if N50EH magnets were available, more companies would offer them or at least provide boastful specification to make up for the higher costs.

As well, you'd be able to buy them as raw material from places like this: http://www.kjmagnetics.com/specs.asp

The best you can do for our intent and purposes (from this chart, at least) would be N38UH.

Pdelcast · 08.18.2008, 01:10 PM

Quote:

Originally Posted by Arct1k

In fairness Patrick I think the question was angled at are the combos and the motors on their own coming out at the same time...

The motors will be available as both combos and single from the start.

Thanx!

Pdelcast · 02:35 PM

Quote:

Originally Posted by killajb

I'm not 100% sure, but I believe that is company Patrick was referring to (without calling out names) on the previous page.

Castle products are priced lower that most for the performance they offer in return. I think that if N50EH magnets were available, more companies would offer them or at least provide boastful specification to make up for the higher costs.

As well, you'd be able to buy them as raw material from places like this: http://www.kjmagnetics.com/specs.asp

The best you can do for our intent and purposes (from this chart, at least) would be N38UH.

Correct. Anyone who claims an N50 magnet that handles more than 120C is not being "accurate... ". They are either using a lower power magnet, or a lower temperature magnet.

So, I would be skeptical of any other claim made by someone who claimed an N50EH magnet.

BTW - We have tested the magnet in question, and it isn't an N50EH as claimed. In fact, it has lower BH than our N38UH magnet, AND starts deteriorating at about 150C with no applied field (which means it is a 120C magnet.) A representative of the company in question made these claims to me (180C N50 magnet) on Friday at the IRCHA show, and I was extremely skeptical. So I tested some magnets from their motors this weekend, and wasn't surprised when they didn't even come CLOSE to what was falsely claimed by this company. I would guess that it is a N38H magnet -- fairly cheap and available magnet.

They may be being misled by their supplier -- but if that were really the case, I'd be worried about a company that builds motors but can't test magnets...

DRIFT_BUGGY · 08.20.2008, 07:05 PM

Just got an email from Tower Hobbies with the ad number for $75 saving off $300+ orders. Very tempted to put this combo on back order now

Metallover · 08.20.2008, 09:03 PM

I wonder if a Electromagnet-Electromagnet motor is possible instead of a electromagnet-permanent magnet... That would be sweet if it is possible.

Sammus · 08.20.2008, 09:06 PM

Quote:

Originally Posted by Metallover

I wonder if a Electromagnet-Electromagnet motor is possible instead of a electromagnet-permanent magnet... That would be sweet if it is possible.

I think that would have to be brushed then - gotta have some way to keep that electromagnetized rotor electrified :P

I want some induction motors for RC use though, that would be cool. means theyd need an a/c speed control.. I wonder what the limitations are and why it hasnt been done? That doesnt use any permenant magnets.

YogyBrushless · 08.21.2008, 12:28 AM

Quote:

Originally Posted by DRIFT_BUGGY

Just got an email from Tower Hobbies with the ad number for $75 saving off $300+ orders. Very tempted to put this combo on back order now

i tryed that but i got the impression that it only work on "Shipable items" so at the time of shipping a dicount code has to be applied. so i`m leaving it until its in stock and apply what ever code is available at the time.

Yousef

E-Revonut · 08.21.2008, 03:32 AM

Quote:

Originally Posted by Metallover

I wonder if a Electromagnet-Electromagnet motor is possible instead of a electromagnet-permanent magnet... That would be sweet if it is possible.

Yes that would imply a brushed motor, until there is a way to send power wirelessly

there is no way to have an electromagnet rotor without brushes. I built larger 140mm -280mm diameter brushed motors for 5 years, it was interesting to see and know how they where built, but no money involved in manufacturing

Patrick · 04:48 AM

You could use the same stationary field coil setup that some alternators use.

It would be hard to make it small enough and strong enough for rc, but the idea is not impossible.

Mad Max · 08.22.2008, 06:28 AM

Quote:

Originally Posted by E-Revonut

Yes that would imply a brushed motor, until there is a way to send power wirelessly

there is no way to have an electromagnet rotor without brushes. I built larger 140mm -280mm diameter brushed motors for 5 years, it was interesting to see and know how they where built, but no money involved in manufacturing

sending power wireless aka Induction ...

you may find that interesting:
http://en.wikipedia.org/wiki/Induction_motor

Sammus · 08.22.2008, 09:30 AM

yeah, thats what I meant by induction motor....

bruce750i · 08.22.2008, 09:47 AM

Where's N. Tesla when when we need him?

George16 · 08.22.2008, 10:28 AM

Quote:

Originally Posted by bruce750i

Where's N. Tesla when when we need him?

You know, I was just watching the documentary about him on the History channel a few weeks ago

.

Metallover · 08:38 PM

hmm, yes I was thinking brushed, but induction would work too. But it all comes down to if a neodymium magnet is stronger or weaker then an electromagnet of the same size. If you could get an all electriC motor to work, you wouldn't have to worry about temps as much because there are no magnets to demagnatize. You would have to worry about things melting like plastic and insulation. That means in theory if you have a very powerful esc then you could put as many volts as you want and gear as highas you want until to either reach the escs limitations or you start melting stuff...

A problem would be efficiency. It would have to be very powerful to be as efficient as two motors.

I am pretty confused about induction motors. It appears they have windings in the stator like a brushed motor, but the rotor is apparently made of "almost solid aluminum or iron". How the heck would that work?