Louis Fourdan is Recording real scorpion data in an acceptable way serious modelers can compare to.
Scorpion motors and kits - RC Groups
Hi
I have received from Scorpion one motor A 6528-160 (s/n XF 0004). Thanks Kyle.
Including 3 gold 6 mm F connectors + 3 black thermo-tubes.
Configuration is 12N14P dLRK
Stator size 65x28 mm
Windings: 8 turns per tooth (16 conductors per slot), 2 strands of 1.12 mm wire, terminating delta
Presently, I have not opened the motor yet.
Weight is measured 1100g (with only the black drum rotor side solidly bolted on the rotor and 4 stator M4 screws)
Accessories weights:
* Cross 46.5g
* 4 screws to fix the prop 27.5g
* Wafer for the prop 11.75g
* 2 nuts M10 for the prop 11g
Total is around 1198g without stand-offs
Stator mounting: 4 holes for M4 screws on circle 32 mm.
Bell outer diameter = 78.5 mm
External shaft diameter = 10 mm 1.25mm pitch, 44 mm free
Internal shaft is 12mm. BBs are two 12x24x6 ZZ (6901)
Overall shaft length = 137 mm (internal diameter 12mm)
End bell with a black drum Ø40mm, 20mm high, 4 screws M5
Bell flange is managed with 8 spokes (Y shaped)
The end of the shaft (prop side) is drilled & screwed M5 on a depth 25mm
As usual for my tests, I first make only no-load tests.
I have used my favorite (for my bench) Scorpion Commander ESC 130A 50V opto ESC equipped with
* 6mm gold F connectors.
* My own rpm phase sensor providing Hz on a DMM (here under my Mustool MT108T)
First rapid checking, running under 12V, on my new bench (profile T-Slot 20x80mm).
All is OK, very smooth rotation, low noise.
I have made a special mounting corner in light alloy to the fixing on my profile. (cross not used)
First testing is phase-phase resistance (3 DMM measurements under 5A CC: 90, 88, 92 mV dc)
Average Rm = 0.0180 ohm @ 35°C (this summer!), that is around 0.0169 ohm @ 20°C
Secondary testing is no load, WOT, under my new PSU: Riden RD 6024 60V 24A (with a pretty color display)
+ ESC + servo tester LETON (powered by external 5V Scorpion guard).
My PSU RD6024 is source-powered by two battery packs LiFePO4 providing 56 V DC
The advantage of a regulated DC/DC converter is that the voltage is very stable, adjustable by one knob and very accurate (calibrated by Riden).
On the picture the A 6528-160 is numbered "8"
The ESC Commander is numbered "5"
I fill a table (manually on a paper sheet) voltage, no-load current and rpm (via Hz), from 12V up to 46V steps 2V. Note than my ESC Commander is not working under 12V.
Then my usual EXCEL template to finish the no load analysis, and transforming Hz into rpm:
Zero current Kv is rounded at 161 rpm/V.
Io no load at 44V is measured 3.07 A
To complete the analysis, I have, in the future, to embed the data in Scorpion Calc (soon) v 3.98
Temporarily I have edited a new motor A 6528-160 on SC v3.97 with the measured parameters
General personal comment:
The A 6528-160 is a very good beast, with a wonderful and modern design.
Kv around 161 rpm/V is interesting under 12S.
The robust windings (2 strands 1.12mm) is providing an excellent low internal resistance 17 milliohm compared to close competitors).
Also, I prefer a configuration 12N14P versus 24N28P used for some motors in the same class (160 Kv range 1000g weight).
In the future I hope to also test the brothers A 6528 -180 and -200 rpm/V
I recommend a voltage range 40V ... 50V (10S ... 12S LiPo)
Examples (suggested by Scorpion) on 3 typical propellers
12S; Falcon 20x10E; 45.6V; 44.7A; 2038W; 6397 rpm
12S; Xoar 24x12E; 44.6V; 80.3A; 3581W; 6085 rpm
12S; Xoar 26x12E; 44.2V; 103.9A; 4592W; 5808 rpm
In the future, I must see what props I could test with my friend Olivier (in flight).
I plan to test with him on a Tucano, span 2.8 meter, weight around 16-17 kg
Prop to test is a 3 blade 25x12 PT model carbon (possibly cut down 24 inches) on 12S
This post will be followed by other reports
a) Back to back testing with a Flipsky 6354 BLDC motor (driver-driven exchange), close Kv 156 rpm/V
b) Loading by electronic 3 phases load (no prop) on the driven 6354
c) Examination of the BEMF signal on an oscilloscope (6354 as the driver)
Louis
Scorpion motors and kits - RC Groups
Hi
I have received from Scorpion one motor A 6528-160 (s/n XF 0004). Thanks Kyle.
Including 3 gold 6 mm F connectors + 3 black thermo-tubes.
Configuration is 12N14P dLRK
Stator size 65x28 mm
Windings: 8 turns per tooth (16 conductors per slot), 2 strands of 1.12 mm wire, terminating delta
Presently, I have not opened the motor yet.
Weight is measured 1100g (with only the black drum rotor side solidly bolted on the rotor and 4 stator M4 screws)
Accessories weights:
* Cross 46.5g
* 4 screws to fix the prop 27.5g
* Wafer for the prop 11.75g
* 2 nuts M10 for the prop 11g
Total is around 1198g without stand-offs
Stator mounting: 4 holes for M4 screws on circle 32 mm.
Bell outer diameter = 78.5 mm
External shaft diameter = 10 mm 1.25mm pitch, 44 mm free
Internal shaft is 12mm. BBs are two 12x24x6 ZZ (6901)
Overall shaft length = 137 mm (internal diameter 12mm)
End bell with a black drum Ø40mm, 20mm high, 4 screws M5
Bell flange is managed with 8 spokes (Y shaped)
The end of the shaft (prop side) is drilled & screwed M5 on a depth 25mm
As usual for my tests, I first make only no-load tests.
I have used my favorite (for my bench) Scorpion Commander ESC 130A 50V opto ESC equipped with
* 6mm gold F connectors.
* My own rpm phase sensor providing Hz on a DMM (here under my Mustool MT108T)
First rapid checking, running under 12V, on my new bench (profile T-Slot 20x80mm).
All is OK, very smooth rotation, low noise.
I have made a special mounting corner in light alloy to the fixing on my profile. (cross not used)
First testing is phase-phase resistance (3 DMM measurements under 5A CC: 90, 88, 92 mV dc)
Average Rm = 0.0180 ohm @ 35°C (this summer!), that is around 0.0169 ohm @ 20°C
Secondary testing is no load, WOT, under my new PSU: Riden RD 6024 60V 24A (with a pretty color display)
+ ESC + servo tester LETON (powered by external 5V Scorpion guard).
My PSU RD6024 is source-powered by two battery packs LiFePO4 providing 56 V DC
The advantage of a regulated DC/DC converter is that the voltage is very stable, adjustable by one knob and very accurate (calibrated by Riden).
On the picture the A 6528-160 is numbered "8"
The ESC Commander is numbered "5"
I fill a table (manually on a paper sheet) voltage, no-load current and rpm (via Hz), from 12V up to 46V steps 2V. Note than my ESC Commander is not working under 12V.
Then my usual EXCEL template to finish the no load analysis, and transforming Hz into rpm:
Zero current Kv is rounded at 161 rpm/V.
Io no load at 44V is measured 3.07 A
To complete the analysis, I have, in the future, to embed the data in Scorpion Calc (soon) v 3.98
Temporarily I have edited a new motor A 6528-160 on SC v3.97 with the measured parameters
General personal comment:
The A 6528-160 is a very good beast, with a wonderful and modern design.
Kv around 161 rpm/V is interesting under 12S.
The robust windings (2 strands 1.12mm) is providing an excellent low internal resistance 17 milliohm compared to close competitors).
Also, I prefer a configuration 12N14P versus 24N28P used for some motors in the same class (160 Kv range 1000g weight).
In the future I hope to also test the brothers A 6528 -180 and -200 rpm/V
I recommend a voltage range 40V ... 50V (10S ... 12S LiPo)
Examples (suggested by Scorpion) on 3 typical propellers
12S; Falcon 20x10E; 45.6V; 44.7A; 2038W; 6397 rpm
12S; Xoar 24x12E; 44.6V; 80.3A; 3581W; 6085 rpm
12S; Xoar 26x12E; 44.2V; 103.9A; 4592W; 5808 rpm
In the future, I must see what props I could test with my friend Olivier (in flight).
I plan to test with him on a Tucano, span 2.8 meter, weight around 16-17 kg
Prop to test is a 3 blade 25x12 PT model carbon (possibly cut down 24 inches) on 12S
This post will be followed by other reports
a) Back to back testing with a Flipsky 6354 BLDC motor (driver-driven exchange), close Kv 156 rpm/V
b) Loading by electronic 3 phases load (no prop) on the driven 6354
c) Examination of the BEMF signal on an oscilloscope (6354 as the driver)
Louis
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