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Apr 28, 2014, 04:18 AM
Jack
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Mini-Review

iFlight iPower MT4114-700KV Motor Mini-Review


iFlight iPower MT4114-700KV Motor Mini-Review

Each motor features:

- EZO Japanese bearing
- 0.2mm silicon steel sheets
- 24N22P (24 arms, 22 poles)
- Dynamic balance
- CNC MACHINED ALUMINUM CASE
- 180 degree magnets
- 45cm long cable

In the Box

● iPower MultiMate MT4114 700KV outrunner
● Heavy Duty Cross Motor Mount
● Four M3x6mm Motor Mount Screws
● Bolt-On style threaded prop adapter with 4 screws
● Retaining Collar with Set Screw (hold down plate for flat mounted prop)
● Three female 3.5mm bullet connectors (bullet connectors factory fitted to leads)
● Three pieces of heat-shrink tubing (shrink tube factory fitted to leads)

Technical Details for iPower MultiMate MT4114 700KV

KV: 700
Internal Resistance: 1.06mO
No-Load Current: 1.01A
Max Current: 35.9A
Max Continuous Current: 26.9A
Max Continuous Watts: 489W
Lipo Cells: 4-8s
Weight: 161g (without hardware)
Dimensions: 46x35mm
Wire length: 450mm
Shaft Diameter: 4.0mm
Recommended Prop: 14"x4.7/ 15" x 5 / 15'' x 6 / 16'' x 5.5
Recommended ESC: 40A

My Initial Impressions

This is another solid entry in the iPower brushless motor line. Another beautifully made motor of better than average quality. It is a higher Kv version of the previously reviewed and tested MT4114-320KV motor. This motor, and the iFlight propellers used in testing, are available through iFlight dealers worldwide and iFlight RC's online store at FunToBuyOnline.com.

Dis-assembly notes:

Removing the magnet housing showed a nicely wound 24N22P motor. Again the quality of the windings catches the eye, especially so for the close confines in which the winding has to be done. The motor is wound with a bundle of six(?) 0.25mm, parallel strands with the turns placed evenly and kept parallel as much as possible. The windings are lightly epoxy coated to prevent shifting and all windings were well contained within the slots and clear of the rotating magnets. The wind on this motor is a Delta terminated dLRK wind.

The magnet housing dome is a CNC machined aluminum part with segmented square notches into which the magnets are fitted. The notches are closely matched to the dimensions of the magnets and the spacing and alignment of the magnets is very precisely controlled. There is virtually no magnetic leakage around the flux ring on this motor, even a Circlip will not adhere to the outside of the magnet housing. That is a sign of a well designed motor that will have more even distributed and fully contained magnetic forces and generate better power.

Motor Dimensions

- Motor Dimensions: 46mm diameter x 33.4mm (back plate to top of magnet housing dome)
- Motor overall length (top of dome to back end of shaft) = 34.9mm
- Motor Weight without accessories: 154g (includes leads and connectors)
- Prop Adapter: 29mm long, 35.4mm +/- long with spinner nut fitted, 5.85mm prop shaft diameter
- Retaining Collar and screws for flat mounted prop are also included
- Overall length with prop adapter fitted and spinner nut in place: 69.1mm +/-

Stator and Magnet Housing Dimensions

- Stator: 24N22P, 24 arms, 22 magnets, 40.6mm O.D. x 14.2mm high
- Stator Laminations = 0.2mm silicone steel
- Baseplate/bearing tube/stator and leads weight = 112g (includes leads and 3.5mm bullet connectors)

- Magnet housing weight and dimensions = 42g, 46.1mm O.D. x 44mm I.D. x 25.5mm high
- Magnets = 22 magnets, 14mm long x 4mm wide x 1mm thick, magnet gaps = 1.89mm +/-
- Bearings = Two 11mm x 4mm x 4mm bearings (O.D. x I.D. x width)
- Motor shaft = 4mm x 35 mm long, shaft extends 6mm on top of dome to locate the prop adapter and flat hub style props

- The magnet housing dome is drilled and tapped for four M3-0,50 screws in a 12mm x 12mm pattern for the bolt on prop adapter.

- The backplate is drilled and tapped for mounting with 3mm screws with four holes in the widely used 25mm x 25mm pattern. And it is also drilled with three more holes for 2.6mm screws in a triangular pattern that is 28mm on each side.

Initial Testing

When on the test stand and run up to check the balance and bearings, no mechanical noises were audible. The motor was very quiet and smooth with only a light humming noise, even when taken to full throttle with out a prop several times to check the kV.

A few quick no load tests showed the motor to have a raw Kv of 739. A raw Kv is the full throttle RPM divided by the battery voltage for the same moment in time. It will vary from a laboratory Kv by a small amount so this motor was very to it's 700 kV rating.

Jack
Last edited by jackerbes; May 10, 2014 at 01:20 AM.
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Apr 28, 2014, 04:20 AM
Jack
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MT4114-700Kv Propeller Testing


MT4114-700Kv Propeller Testing

I use an eLogger V3 or V4 to record test data and have a temperature probe that fits into the back plate through a cooling opening so as to be in contact with the windings. I can see the power and temperature data displayed in real time as it is being recorded.

The full throttle readings from the testing are inlcuded below, you can see the full details and all the test data on this motor at FlyBrushless.com:

iFlight-RC - MT4114-700Kv - http://www.flybrushless.com/motor/view/656

The motor was tested with props that I have on hand that might be used with this motor on multicopters and other aircraft.

Props Tested

iFlight iCF 10x4.5 CF
APC SF 10X4.7
APC SF 11X4.7
iFlight iCF 11x4.7
iFlight-RC iCF 12x3.8
iFlight-RC iCF 12x4.5
iFlight-RC iCF 12x6

I tested at 3S, 4S, and 5S voltages and take readings at 25%, 50%, 75% and 100% throttle. Not all props were tested at all voltages and throttle settings, when RPM and thrust were too low to be useful, testing was only done at useful voltages and the higher throttle settings.

The voltages chosen for each prop were based on a combination of the published or established RPM limits and the temperature rise in the motors.

Full Throttle Results

Each line below is the full throttle readings for that voltage, read my test results across as:

Cell count - Prop - Volts, Amps, RPM, Thrust(g), Winding Temperature at Full throttle

3S - iFlight iCF 10x4.5 CF - 11.15V 11.04A 7480RPM 745g 78F
4S - iFlight iCF 10x4.5 CF - 14.86V17.23A 9609RPM 1335g 82F
5S - iFlight iCF 10x4.5 CF - 18.61V 23.62A 11399RPM 1680g 87F

3S - APC SF 10X4.7 - 11.03V 14.82A 7121RPM 1005g 82F
4S - APC SF 10X4.7 - 15.23V 11.25A 7153RPM 970g 89F

3S - APC SF 11X4.7 - 11.07V 13.82A 5996RPM 980g 87F
4S - APC SF 11X4.7 - 14.95V 10.53A 5933RPM 965G 103F


28 April 2014 - Added note: I think I made an error of some type on the testing on the APC 10 x 4.7 and 11 x 4.7 SF props. manuel_ v pointed out that his test results were quite different. So I am crossing those results out! And I will test those again and post that.

3S - iFlight iCF 11x4.7 - 11.11V 15.63A 7096RPM 1080g 80F
4S - iFlight iCF 11x4.7 - 14.68V 24.50A 8902RPM 1770g 87F

3S - iFlight-RC iCF 12x3.8 - 11.07V 16.40A 7013RPM 1160g 88F
4S - iFlight-RC iCF 12x3.8 - 14.62V 26.08A 8737RPM 2020G 83F
Comment: 4S run was halted when my power supply exceeded it's max current rating

Comment: When props below were not tested on 5S and 6S it is because the power supply used in testing would have been over it's max current rating.

3S - iFlight-RC iCF 12x4.5 - 11.01V 17.96A 6856RPM 1245g 88F
4S - iFlight-RC iCF 12x4.5 - 14.55V 27.92A 8571RPM 1960g 82F

3S - iFlight-RC iCF 12x6 - 10.40V 16.80A 6900RPM 1080g 79F
4S - iFlight-RC iCF 12x6 - 14.53V 26.30A 8641RPM 1610g

A continuous throttle run at 90% throttle was done with the iCF 12x6 prop to check for stabilized temperatures with the largest prop tested. The averages for that run are as follows

Voltage, Prop, Duration in seconds, Volts, Amps, RPM, Thrust(g), Temperature:

4S - iCF - 12x6 prop - 102s 15.01V 15.30A 7332RPM 1180g 95F stabilized, 120F resting

Comment: All of the motor and prop combos tested were all capable of sustained full throttle operation without danger of overheating.

iFlight has this motor rated at 489W continuous and I have had it up to a little over 400W at this point. It has gotten warm but not hot so I think it can be run at the 489W rating but don't have a power source that will let me test it at that level.

So I found this to be another good quality iFlight motor. No flaws or problems with it were noted in testing and it was running as well and as quietly at the end of the test as it was at the start.

Jack
Last edited by jackerbes; Apr 29, 2014 at 06:05 PM.
Apr 28, 2014, 05:24 AM
Jack
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Additional 3S Prop Testing - 27 April 2014


The traditional approach to prop testing has been to find and report prop and battery combos that are safe for continuous or nearly continuous full throttle operation.

It is realistic to expect that some will use prop and battery combos that produce useful amounts of thrust at less than full throttle but that may overheat at full throttle. This is particularly true in cases where sustained steady thrust levels are needed (i.e., FPV and aerial camera work) more than full throttle power. And in cases where having some throttle travel left to make up for pack voltages that are falling under load is an advantage.

So the point of this testing was to find the thrust levels that could be expected at partial throttle levels. And, of course, it also give some data points as to the input power needed by some newer to the market props.

Cell count - Prop - Throttle Percent, Volts, Amps, RPM, Thrust(g), Winding Temp

3S - iCF CF 15 x 5 DJI Hub - 25% - 12.50V 2.19A 2140RPM 244g 79F
3S - iCF CF 15 x 5 DJI Hub - 50% - 12.36V 7.41A 3652RPM 751g 78F
3S - iCF CF 15 x 5 DJI Hub - 75% - 12.06V 17.79A 4978RPM 1361g 85F
3S - iCF CF 15 x 5 DJI Hub - 100% - 11.54V 33.75A 6048RPM 2060g 91F

Run aborted due to power supply overload at full throttle
Combo is OK for up to 3/4 throttle operation and short full throttle bursts

3S - iCF CF 16 x 5.5 Dragon Fly - 25% - 12.49V 2.50A 2162RPM 589g 74F
3S - iCF CF 16 x 5.5 Dragon Fly - 50% - 12.32V 8.24A 3581RPM 1143g 75F
3S - iCF CF 16 x 5.5 Dragon Fly - 75% - 12.03V 18.69A 4730RPM 1800g 85F
3S - iCF CF 16 x 5.5 Dragon Fly - 100% - 11.29V 36.30A 5663RPM 2480g 92F

Run aborted due to power supply overload at full throttle
Combo is OK for up to 3/4 throttle operation and short full throttle bursts

3S - iCF CF 14 x 4.7 - 25% - 12.57V 1.96A 2283RPM 211g 65F
3S - iCF CF 14 x 4.7 - 50% - 12.44V 6.14A 3836RPM 658g 66F
3S - iCF CF 14 x 4.7 - 75% - 12.20V 14.92A 5279RPM 1280g 72F
3S - iCF CF 14 x 4.7 - 100% - 11.79V 29.34A 6529RPM 1891g 89F

Run aborted due to power supply overload at full throttle
Combo is OK for continuous 3/4 throttle operation and full throttle bursts

3S - APC TE 13 x 8 - 25% - 12.65V 1.94A 2281RPM 178g 82F
3S - APC TE 13 x 8 - 50% - 12.53V 6.05A 3878RPM 590g 79F
3S - APC TE 13 x 8 - 75% - 12.27V 15.22A 5380RPM 1169g 79F
3S - APC TE 13 x 8 - 100% - 11.86V 29.76A 6580RPM 1830g 85F

Continuous full throttle operation OK

3S - APC TE 12 x 8 - 25% - 12.49V 1.90A 2415RPM 148g 84F
3S - APC TE 12 x 8 - 50% - 12.38V 5.29A 4037RPM 499g 80F
3S - APC TE 12 x 8 - 75% - 12.18V 12.45A 5584RPM 999g 79F
3S - APC TE 12 x 8 - 100% - 11.83V 24.80A 6935RPM 1569g 85F

Continuous full throttle operation OK

3S - APC TE 12 x 6 - 25% - 12.51V 1.78A 2675RPM 154g 84F
3S - APC TE 12 x 6 - 50% - 12.42V 4.32A 4199RPM 446g 81F
3S - APC TE 12 x 6 - 75% - 12.26V 9.96A 5847RPM 891g 78F
3S - APC TE 12 x 6 - 100% - 11.96V 19.87A 7393RPM 1470g 87F

Continuous full throttle operation OK

Jack
Last edited by jackerbes; Jun 11, 2014 at 01:42 PM. Reason: The prop called 15 x 6.5 should have been called 16 x 5.5
Apr 28, 2014, 05:56 AM
homo ludens modellisticus
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Last edited by Ron van Sommeren; May 05, 2014 at 09:54 AM.
Apr 28, 2014, 06:21 AM
Jack
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Last edited by jackerbes; Apr 28, 2014 at 12:23 PM.
Apr 28, 2014, 06:58 AM
homo ludens modellisticus
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Last edited by Ron van Sommeren; May 05, 2014 at 09:55 AM.
Apr 28, 2014, 09:39 AM
Jack
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Last edited by jackerbes; Apr 28, 2014 at 12:23 PM.
Apr 28, 2014, 11:12 AM
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My test for this motor.

Manuel V.
Last edited by manuel v; Apr 28, 2014 at 11:27 AM.
Apr 29, 2014, 08:52 PM
Jack
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APC SF 10 x 4.7 and 11 x 4.7 Props Re-tested


manuel_v pointed out that my earlier testing on these two props did not appear to be right. I re-tested them and he was absolutely right.

In the re-testing I tested both props at 25%, 50%, 75% and 100% throttle and on 3S and 4S. On 4S the 100% throttle RPM would have been excessive so I only tested to 75% on 4S.

You'll note that the recommended max RPM for both props was exceeded slightly at 100% throttle on 3S. I don't consider that dangerous and in the real world, throttling back and falling voltages as packs are used up will keep the RPM levels within recommended levels.

3S - APC SF 10X4.7 - 25% - 12.50v 1.71A 3065RPM 156g 76F
3S - APC SF 10X4.7 - 50% - 12.42V 3.67A 4438RPM 349g 74F
3S - APC SF 10X4.7 - 75% - 12.29V 8.29A 6055RPM 718g 74F
3S - APC SF 10X4.7 - 100% - 12.05V 16.69A 7682RPM 1135g 76F

4S - APC SF 10X4.7 - 25% - 16.35v 2.19A 3225RPM 258g 76F
4S - APC SF 10X4.7 - 50% - 15.50V 6.89A 5081RPM 560g 69F
4S - APC SF 10X4.7 - 75% - 14.38V 10.82A 6952RPM 962g
Not tested at 100% throttle due to excessive RPM (6500 = recommended MAX)

3S - APC SF 11X4.7 - 25% - 12.45v 1.85A 2670RPM 166g 59F
3S - APC SF 11X4.7 - 50% - 12.38V 4.74A 4129RPM 452g 64F
3S - APC SF 11X4.7 - 75% - 12.16V 11.66A 5773RPM 907g 64F
3S - APC SF 11X4.7 - 100% - 11.83V 22.40A 7127RPM 1478g 72F

4S - APC SF 11X4.7 - 25% - 16.35v 2.19A 3224RPM 253g 70F
4S - APC SF 11X4.7 - 50% - 15.49V 6.89A 5081RPM 722g 69F
4S - APC SF 11X4.7 - 75% - 13.92V 14.10A 6346RPM 1187g 72F
Not tested at 100% throttle due to excessive RPM (5909 = recommended MAX)

Jack
Dec 30, 2016, 03:56 PM
Registered User
manuel v's Avatar
Hi Jack.

Im check your data in 10x4.7 propeller.

Effy to 25% acceleration= 39.77%
Effy to 50% acceleration= 56.16%
Effy to 75% acceleration= 63.89%
Effy to 100% acceleration= 66.21%

not better to 4slipo.
Effy to 25% acceleration= 27.37%
Effy to 50% acceleration= 36.05%
Effy to 75% acceleration= 63.37%
Last edited by manuel v; Dec 31, 2016 at 02:37 PM.


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