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01-24-2013 10:59 PM  4 years agoPost 1
gouki

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philippines

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anybody used the new savox motors yet? is it really cool to the touch after flying? i am looking for a motor that doesn't heat up so i can fly one pack after the other

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01-29-2013 01:34 PM  4 years agoPost 2
3D Heli Ireland

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Ireland

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I have a selection of the Savox motors (for both 10S and 12S setups) and they certainly run cooler or in some instances at least as cool to the touch than other high powered motors that I have tried. They have a built in cooling fan which seems to have hit upon the correct balance of cooling versus power loss.........plenty of cooling and no shortage of power!

BTW I have and still do run back to back hard flights for as many as nine consecutive flights with no issue at all and have purposely done so to test them out. No issue

Skookum Robotics,Sav�x, Motors and Servos,Optipower,SwitchGlo,CML st

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01-29-2013 01:37 PM  4 years agoPost 3
gouki

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philippines

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thank you for the feedback! that's the answer i was hoping to hear haha i'ma gonna get me that! thanks!!

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01-29-2013 04:15 PM  4 years agoPost 4
rexxigpilot

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Florida

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i am looking for a motor that doesn't heat up so i can fly one pack after the other
No reason you can't fly one pack after the other. It is a misconception to think that the motor needs to cool between flights. It doesn't. The mass of the motor is very small compared to the heat generated. It's mass will be saturated with heat long before the end of the flight. The maximum motor temp is a function of motor power, efficiency, ambient air temp. and cooling capacity (fan, direct airflow, etc.). Once the motor heating caused by the power use inefficiency reaches equilibrium with the cooling capacity, there will be no further rise in temperature.

The ESC heating is probably the same scenario. Battery charging, on the other hand, is quite different. You need to let them cool sufficiently before recharging them.

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01-29-2013 10:56 PM  4 years agoPost 5
gouki

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philippines

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i thought motors needed cooling down to prolong bearing life? i remember reading somewhere that motor bearings will last longer if the motor get some rest after every flight and that high temp will decrease it's life quickly??

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01-30-2013 04:11 PM  4 years agoPost 6
rexxigpilot

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Florida

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gouki, that is not true. Many myths on the internet.

The point of my last post was that the motor will reach the same peak temperature whether you rest it or not.

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01-30-2013 04:19 PM  4 years agoPost 7
JKos

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Redondo Beach, CA

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Rexxi,
To be fair, there have certainly been setups that needed a rest between flights. Flying a second flight too soon meant almost certain damage to the magnets or melting the windings. I had one of those at one time. It just wasn't safe to fly again immediately.

Remember, as the temperature of the windings increases, the resistivity increases as well. As the resistivity increases, the efficiency decreases and more heat is generated. The more heat that is generated, the hotter the motor gets. You can see where this is going.

Now, we do seem to be past this issue these days as motor efficiency and cooling effectiveness have both increased.

- John

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01-30-2013 04:39 PM  4 years agoPost 8
rexxigpilot

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Florida

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John, like I said, there are many myths out there.

Without going through complex thermodynamic calculations to prove the point, I will just pose one question. Why do motor manufacturers publish a continuous power rating if you have to stop and let a motor cool down?

Now, there are installations (like in a semi-sealed enclosure where no cooling air can get to it) that violate the design parameters of the motor and which can cause a need to limit a motor's run time. But in a practicable installation you should be able to run your motor at the manufacturer's continuous rated input power, with bursts of peak power thrown in for good measure, without stopping.

gouki lives in the Phillipines. It gets pretty hot there, so maybe his environmental conditions (ambient air temp.) is in excess of the design parameters. Although I live in Florida which is equally hot and humid. We have no problems here running back to back, hard 3D flights.

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01-30-2013 04:55 PM  4 years agoPost 9
JKos

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Redondo Beach, CA

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Rexxi,
Were you in on high power electric helis back in the days of $800+ packs?

I understand what you are saying about thermodynamics. Folks were burning up motors in those days from getting them too hot. The setups were pushing the motors to the thermal limits by the end of a flight. Going immediately again pushed them past the limits. The thermal output of the motor simply exceeded the cooling capacity.

As I said, we seem to be well past those days but I suspect the "myths" were born then.
Why do motor manufacturers publish a continuous power rating if you have to stop and let a motor cool down?
That's an excellent point. If you stay within manufacturers' specs and the specs are truthful, then there shouldn't be much of an issue.

Also, note that even some modern, current instruction manuals have a statement to let the system cool between flights. I just bought something that says that. Thus, the "myth" is continued.

- John

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02-11-2013 06:56 PM  4 years agoPost 10
GetToDaChopper

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Las Vegas , NV

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really motors will always be hotter when they are not running because there is no cooling so the heat that has built up in the stator is released and heats up the can which makes the motor seem hotter than it is in flight but when you start flying again it will cool back down a bit.....

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▲ ▲ ▲ One of a Kind !!!

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02-19-2013 01:49 AM  4 years agoPost 11
JitsuGuy

rrKey Veteran

Tulsa, Oklahoma

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So what are the opinions of these motors? Anyone have experience?

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02-19-2013 06:04 PM  4 years agoPost 12
GetToDaChopper

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Las Vegas , NV

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they are a 10 Pole 12 Slot motor and from the little i've read about this config it should make lots of torque......

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▲ ▲ ▲ One of a Kind !!!

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02-19-2013 07:01 PM  4 years agoPost 13
JitsuGuy

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Tulsa, Oklahoma

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That's great news!

I'm gonna get one!

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02-15-2014 06:05 AM  3 years agoPost 14
Collie_Farmer

rrNovice

reno,NV

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savox

I just ordered 550kv 600 class for my align 600 pro dfc..hope they are good
just to let you guys know they are on SALE!!! ALMOST HALF OFF RIGHT NOW..ordered mine a few minutes ago
heres the link to savox sale.. I am not a rep for them just very excited about price and fig u guys may want to know
http://www.savoxusa.com/category_s/73.htm

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