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HomeAircraftHelicopterHelicopter Main Discussion › RC Heli Electric Motors 4 Pole or 6? any Difference In Performance
10-26-2013 01:18 AM  5 years agoPost 1
icanfly

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ontario

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Simple mechanical question. I notice most heli motors are 6 magnet poles, where-as rc cars are 4. My understanding is that the 6 pole is made to maintain a defined rpm and do it steadily and a 4 pole is made to run a variety of rpms and not suffer over heating at either end of the rpm range, more a torque monster than a horse power thing.

Efficiency? Noise? Gearing? What are the positives and negatives of a 4 magnet pole bl motor in a heli?

Is this correct, just throwing an easy question out there, simple enough. I have a op to experiment.

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10-26-2013 01:34 AM  5 years agoPost 2
devin120

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Canada

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More poles generally means more torque at higher speeds.

Miniature Aircraft - OS power - Futaba electronics

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10-26-2013 04:06 AM  5 years agoPost 3
icanfly

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ontario

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so the 4 pole would work for a variety of set speeds and not suffer torque losses then. Slow go for long duration, hover, scale and/or obstacle course, faster for loops rolls/sport, wind, higher speed for 3d. Sounds ideal for the multi rpm type heli.

I figured a car motor might be good because a pitch change could demand a huge dump of power. Sometimes brute torque is better than hp. It's good to torque out of any stall conditions when hp is maintained, means lots of headroom.

At least with my motor there'll be lots of headroom so I can customize settings and find that "sweet spot".

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10-26-2013 04:17 AM  5 years agoPost 4
devin120

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Canada

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Hp is directly proportional to torque.

Torque is actual mechanical turning power,
HP is the ability to move through resistance

Helis are designed to run in a short spectrum when it comes to headspeed so the motor should theoretically be making the most torque or be in the torque band at those rpms.

So to change from a 4 to 6 pole motor is effectively almost like changing the gearing.

At the end of the day, helis can be geared. Your not going to find huge differences. Try playing with kv ratings.

Miniature Aircraft - OS power - Futaba electronics

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10-26-2013 02:05 PM  5 years agoPost 5
icanfly

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ontario

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Try playing with kv ratings.
that was the idea, the 4 pole doesn't rely on a constant rpm to produce hp/torque. This means it will rotate the head at a wide range of rpm without burning up.

the motor pic'd is a MiniPunch car 5000kv (tops out at 6k kv) motor which came by sale and is a perfect fit into my Blade 300zyx. Umm, maybe I should tell you that close proximity to leafy green stuff has necessitated a throttle boost without a collective raise on occasion. It's an opportunity to go 14 degree pitch at 85 percent throttle and nothing but throttle from there to 100 percent.

The high torque motor could perform like a fp heli. The rpm would raise without the collective in sinc. I think that's where an advantage lay. The other would be in gearing. from other reports and experiments with gearing the 300x and tossing in a 450 3600kv motor (12 tooth pinion 140 main) the best 3d headspeed for the 300 was 3600rpm. At 80 percent efficiency with my motor and an 11 tooth pinion the rpm is about 3600 rpm. Stock kv was 4400kv and the 10 tooth gear optimizes the gear ratio best (guys complained of bogging in 3d with the 9 tooth pinion).

I'd like to configure a step down 3rd gear and get a slimmer body line with a smaller main, and guess what, the free wheel increases torque.

Does the esc matter or will any esc work, I have a HobbyWing Platinum series 35amp, and I believe it does have a govern mode I'll have to read up on more.

for the first time I understand the computer geek in those scifi movies.

If your wondering what this has to do with anything on a larger scale, the fact is heli flight consists of varying ff speed. If the rotor speed was increased for fff and then brought to a hover, hover speed could be lowered to prolong battery life. A flyer could cruise around at low hs and then put the peddle to the metal when desired. Instead of relying on a switch the throttle response is instant and variable. I set my tx that way and now I have MORE KV to play with. Imagine topping out with 14 degrees at 85 percent throttle while going 100mph, then go into rpm hyper drive at the throttle. You see, you don't stress the motor quite as much when most of the hard work has been done at lower throttle ranges, then everything runs cooler and more efficiently.

Great, I get to advance because of a happenstance opportunity. Wait till you see the thing complete, it's a "Kuerazy Kool Karbon Komanche", lol, yeah.

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