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| == Hardware == | | == Hardware == |
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| == Drone software ==
| | Build on a hand-wired PCB as a prototype |
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| == Propeller - motor performance ==
| | [[Drone control hardware]] |
| | <!-- [[File:schematic_rev0.png | 150px]] --> |
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| Measured with the app below, using the motor 3508-700KV Turnigy Multistar 14 Pole Brushless and a 14x5.5 carbon propeller.
| | == Drone software == |
| The ESC is a Hobby-wing x-rotor 40A controller.
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| === Time responce ===
| | [[Drone firmware]] |
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| [[File:3508-700-14x5.5-11v.png | 600px]]
| | == Magnetometer calibration == |
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| With 11 V supply (3 lipo cells).
| | Calibration is used using a calibration version of firmware and a calibration app from Prop Shield manufacturer. |
| From 1.1ms to the ESC (idle) to 1.9ms almost full throttle. The ESC update frequency is 400 Hz.
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| [[File:3508-700-14x5.5-15v.png | 600px]] | | [[Drone compass calibration]] |
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| With 11 V supply (4 lipo cells). note that 30 amps is not sustainable, the motor gets hot fast.
| | == ESC calibration == |
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| === Trust 3508-700 14x5.5 ===
| | The drone control uses ESC pulse width from 1 to 2 ms, and all ESCs should be calibrated to use this range. |
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| Transfer gain measurement from ESC pulse width to trust.
| | [[ESC calibration]] |
| The Hobby Wing controller is calibrated to 1ms=off, 2ms=full power.
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| [[File:trust-3508-700_14x5.5.png | 600px]]
| | == Propeller - motor performance == |
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| Normal size propeller (14x5.5) for the motor. The translation for ESC pulse to trust is almost linear.
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| The thrust increases with the square of the rotation speed, but drag increases with power 3 of the rotation speed, so the end result is almost linear.
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| The maximum thrust is about 1kg (10N).
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| Data for the graph above is
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| % Measurement from esc,motor,propeller test
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| % file created 2020-10-04 17:49:57.982360
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| % 1: esc value (motor 1) 0=1ms, 1024 = 2ms
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| % 2: rps (motor 1) a rotations per second)
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| % 3: rps (motor 1) b rotations per second)
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| % 4: Motor voltage (volt)
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| % 5: total current (amps)
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| % 6: thrust force (gram force)
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| % 7: CCV (rotation direction)
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| % 8: Temperature motor (deg C)
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| % 9: Temperature ESC (deg C)
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| 100 8.27 8.27 11.3 0.1 10 0 38.8 33.3
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| 200 18.89 18.91 11.3 0.4 54 0 28.8 27.9
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| 250 24.78 24.78 11.3 0.7 92 0 27.2 28.0
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| 300 30.11 30.16 11.3 1.2 136 0 27.8 27.6
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| 350 35.65 35.65 11.1 1.7 192 0 27.2 28.2
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| 400 40.33 40.54 11.2 2.5 246 0 26.3 28.7
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| 450 44.49 44.47 11.3 3.6 300 0 27.4 28.4
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| 500 49.34 49.33 11.3 4.5 371 0 26.8 28.5
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| 550 54.00 54.01 11.4 5.8 440 0 27.9 29.2
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| 600 58.11 58.07 11.2 7.2 523 0 27.0 29.3
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| 650 61.94 61.71 11.0 9.0 600 0 27.0 30.0
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| 700 65.24 65.20 11.0 10.3 660 0 27.6 29.8
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| 750 68.22 68.67 11.2 12.5 730 0 29.2 30.6
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| 800 71.01 71.14 11.3 14.4 806 0 31.7 30.3
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| 850 73.87 73.89 11.5 16.7 870 0 32.1 29.1
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| 900 76.76 76.62 10.8 18.7 930 0 33.0 31.3
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| === Trust 3508-700 18x5.5 ===
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| [[File:trust-3508-700_18x5.5.png | 600px]]
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| Oversize propeller (18x5.5). The translation for ESC pulse to thrust is almost linear here, with lower RPM and higher motor current.
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| Data for the graph above with 18" propeller is
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| % Measurement from esc,motor,propeller test
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| % file created 2020-10-04 17:40:42.147504
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| % 1: esc value (motor 1) 0=1ms, 1024 = 2ms
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| % 2: rps (motor 1) a rotations per second)
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| % 3: rps (motor 1) b rotations per second)
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| % 4: Motor voltage (volt)
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| % 5: total current (amps)
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| % 6: thrust force (gram force)
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| % 7: CCV (rotation direction)
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| % 8: Temperature motor (deg C)
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| % 9: Temperature ESC (deg C)
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| 100 5.95 5.95 11.3 0.2 12 0 24.7 28.3
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| 200 16.19 16.18 11.2 0.8 112 0 24.7 28.2
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| 300 24.77 24.76 11.2 2.2 270 0 24.7 28.8
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| 400 31.39 31.42 11.0 4.7 440 0 23.9 29.5
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| 500 36.94 36.98 11.2 9.0 640 0 25.1 30.0
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| 550 38.70 38.70 11.3 10.5 700 0 25.8 31.4
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| 600 40.72 40.56 11.0 12.5 770 0 28.4 32.4
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| 650 41.95 42.14 10.7 14.6 840 0 29.1 35.4
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| 700 43.73 43.73 11.1 18.5 890 0 33.1 37.1
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| 750 44.79 44.83 10.8 20.2 960 0 35.0 37.9
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| 800 45.53 45.56 11.8 22.3 1000 0 39.6 39.0
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| === Software and files ===
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| The files for these results is in our subversion repository:
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| Install subversion - https://subversion.apache.org/packages.html - and from a command line
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| svn checkout svn://repos.gbar.dtu.dk/jcan/mobotware/drone_ctrl
| | [[Drone motor performance]] |
| cd drone_ctrl/trunk/motortest_gui
| | [[File:3508-700-14x5.5-11v.png | 150px]] |
| ls
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| - motortest_gui.py is the application below.
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| - plot_rpm_sensor.m is the Matlab script to make the plots above.
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| ... other support and data files.
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| cd drone_ctrl/trunk/doc/Matlab
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| - Simulink version of hexacopter drone
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| == Motor test app == | | == Motor test app == |
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| [[File:motortest_gui.png | 600px]] | | [[Drone motor test app]] |
| | | [[File:motortest_gui.png | 120px]] |
| == MATLAB simulation ==
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| [[File:drone_ctrl_simulink.png | 800px]] | |
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| Simulink model of hexacopter.
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| [[File:drone_ctrl_sim_hex.png | 600px]]
| | ==Matlab simulation== |
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| Sim mechanics simulated hex-drone hoovering.
| | [[Drone MATLAB simulation]] |
| | [[File:drone_ctrl_sim_hex.png | 120px]] |
