While searching for the Ideal motors I figured out few things which will give smooth flight and long battery life

1. Should be low Kv

2. Should have enough torque. May be the motors with more outer dia are better

3. Should have very low weight

4. Should be using very low current while on low load. but spinning bigger props

5. CNC light weight casings

6. Should be using Neodmium high temp magnets

7. High quality lamination 0.2mm stator sheet for high temp operation

8.High quality motor shaft.

Or anything else

Views: 4866

Comment by Jani Hirvinen on January 16, 2012 at 8:26am

Farooq, we can do those for you. Are you willing to pay 80 USD each?? :)

Anyways, as jDrones has always been working closely with several motor companies. We will have new high efficient motors coming soon so let's hope that you will have your wishes come true.

Comment by Jani Hirvinen on January 16, 2012 at 8:51am

Yes like johann said (he's referring our earlier discussions), every different frame type needs motor/propeller/esc combination that is properly scaled for that device and to main flying area.

It's really different to fly on close to sea level than flying on himalayas on high altitudes. Light/Heavy weights, windy/no wind and so on. 

Comment by Farooq Niaz on January 16, 2012 at 12:14pm

Jani: I think 80$ should not be an issue but quality is the prime reason.

Johann: I think most people fly quads around 1.5Kg flying weight. So If we take this as reference what is your suggestion

Comment by Farooq Niaz on January 16, 2012 at 12:40pm

By the way what is the benefit of having more poles in such a motor

Comment by Anish on January 16, 2012 at 4:06pm

challenge is the middle ground, right pricing for right charactestics. I assume if there was enough of multirotor market we should see market evolving in that direction. As of now, there is gap for motors of good quality between 200<x<400 watts, the price gap between 100-200 watt to 400-500 watt is non linear...

Comment by Squalish on January 16, 2012 at 4:41pm
Items 1-4 are not objectively good: it is entirely possible to have those numbers go *too far* for a given AUW, number of motors, prop, and voltage. Finding the optimal solution involves varying these numbers along with props.

In the end, the bottom line of all this tuning is to maximize either endurance or maneuverability. Minutes aloft down to a certain battery discharge is the only objective, apples for apples means of comparison.
Comment by Andrew Radford on January 17, 2012 at 1:44am

So are those motors I see which are flatter and have more poles better for Quads, they are more 'pancake' looking than the normal motors - they would be more suitable for quads?

Comment by Cliff-E on January 17, 2012 at 2:41pm

more polls == better speed control == more stable multicopter.

Sizing motors will always be a problem since they need to be matched to the props being used. Otherwise, you're just wasting watts or over heating (ESC or motor)

A set of motor specs (basically a Kv range) should be developed first as a start IMO:

motors for a

10x4.5 (2 blade)



9x5 (3 blade)

7x6 (2 blade)

are the most common props to start with since you can get them off the shelf.

Comment by Jani Hirvinen on January 18, 2012 at 8:11am

Andrew, answer is yes/no. As always we at jDrones are working with several motor companies and we have huge amount of motors that we are testing and modifying for our needs. Currently we have several motors in test/modify program. 

Good thing on those motors is that they do not use so much of current but bad thing is that they also do not create lift like what our normal motor does. Another good thing is that we can swing 15-16" propellers with those. 

Mainly those big motors gives massive torque but with small rpm so they need big propellers too.

Just as example, one of our test motor gave results like this: 15" Carbon Prop., 60% power output, 2.45Amp, Thurst 438gr. Same motor with 70%, 3.69Amp, 635gr and so on

After all tests and modifies are fully done, we will have best ones of those in store.

Comment by Russell B. Sutton on January 18, 2012 at 8:20am
@ jani. Some pictures of all these motors and testing of them would be cool, maybe even some video. :)


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