Motor issues when running ESC calibration
-
@rdjarvis , thank you for clarifying.
it seems there is some hardware issue. Can you please confirm that nothing is making contact with the ESC components, which could cause a short or something like this? Also please inspect the 4-pin UART connector on the ESC (and around it) to make sure there is no short or anything like that cause by loose debris or anything else.
Top lines are from FPV ESC#2. (GREEN ESC DETECTED)
Bottom lines are from FPV ESC#1.
ERROR: voxl_uart_read_bytes: Bus '12' is not initialized
This has been a common ERROR with these tests. What is "Bus 12" and how do we initialize it?
-
@rdjarvis , thank you for clarifying.
it seems there is some hardware issue. Can you please confirm that nothing is making contact with the ESC components, which could cause a short or something like this? Also please inspect the 4-pin UART connector on the ESC (and around it) to make sure there is no short or anything like that cause by loose debris or anything else.
**UPDATE.
#2 ModalAI FPV connected to VOXL2 and 4x T-Motor 2203.5 2850kv
Good connections, good lights and tones, VOXL2 connected to PC perfectly
Loaded params provided by you and conducted good spin test.
Connected to QGC, arm/disarm/motor kill all successful. (spins / stops)
Armed in Manual and Stabilized, motors armed and when throttle added there is no response from motors. we can view on QGC when throttle (Channel 3) is increased and get positive value.
Verified all other channels operating in QGC Radio tab. Low, High PWM values are in limits, positive response for pitch, roll, and yaw commands.
NO RESPONSE FROM ESC/MOTORS ON THROTTLE INPUTS. MOTORS DO RESPOND TO DIFFERENT ANGLES TO TRY AND LEVEL BUT NO THROTTLE INPUT REGISTERED WHEN USING RC.
-
**UPDATE.
#2 ModalAI FPV connected to VOXL2 and 4x T-Motor 2203.5 2850kv
Good connections, good lights and tones, VOXL2 connected to PC perfectly
Loaded params provided by you and conducted good spin test.
Connected to QGC, arm/disarm/motor kill all successful. (spins / stops)
Armed in Manual and Stabilized, motors armed and when throttle added there is no response from motors. we can view on QGC when throttle (Channel 3) is increased and get positive value.
Verified all other channels operating in QGC Radio tab. Low, High PWM values are in limits, positive response for pitch, roll, and yaw commands.
NO RESPONSE FROM ESC/MOTORS ON THROTTLE INPUTS. MOTORS DO RESPOND TO DIFFERENT ANGLES TO TRY AND LEVEL BUT NO THROTTLE INPUT REGISTERED WHEN USING RC.
@rdjarvis, so when you arm, the motors are spinning at idle rpm and rpms are not changing? Can you send me a short px4 log of this test?
Did you update px4 params for voxl esc min and max rpms?
-
@rdjarvis, so when you arm, the motors are spinning at idle rpm and rpms are not changing? Can you send me a short px4 log of this test?
Did you update px4 params for voxl esc min and max rpms?
@Alex-Kushleyev yes motors spin when armed and respond appropriately to pitch, yaw and roll inputs (motors slowing and speeding up)
We have exhausted our efforts for this evening and will re-attack in the morning.
Thank you for all the help with hunting down these issues. We appreciate it and understand the frustration with these things.
Thank you,
RDJ -
@Alex-Kushleyev yes motors spin when armed and respond appropriately to pitch, yaw and roll inputs (motors slowing and speeding up)
We have exhausted our efforts for this evening and will re-attack in the morning.
Thank you for all the help with hunting down these issues. We appreciate it and understand the frustration with these things.
Thank you,
RDJ@rdjarvis , based on your latest post, it seems the motors are spinning and responding to roll, pitch, yaw inputs, so i think the remaining issues may be in PX4 params.
By the way, I also wanted to mention, we have a fork of px4 flight review tool here : https://github.com/modalai/px4-flight-review . There is a quickstart guide in readme how to run this locally. Our version allows you to display ESC data such as commanded and actual RPMs, ESC temperatures, individual motor currents (where available) and total battery current.
By the way, since you are probably not using an APM for voltage/current monitoring, you should set (or double check) the
voxl_escpx4 driver to publish the voltage/current measurement, usingVOXL_ESC_PUB_BSTset to1.Then you will see the battery voltage and total current in battery status. (however if you are using APM, then you dont need that, set to 0)Alex
-
@rdjarvis , based on your latest post, it seems the motors are spinning and responding to roll, pitch, yaw inputs, so i think the remaining issues may be in PX4 params.
By the way, I also wanted to mention, we have a fork of px4 flight review tool here : https://github.com/modalai/px4-flight-review . There is a quickstart guide in readme how to run this locally. Our version allows you to display ESC data such as commanded and actual RPMs, ESC temperatures, individual motor currents (where available) and total battery current.
By the way, since you are probably not using an APM for voltage/current monitoring, you should set (or double check) the
voxl_escpx4 driver to publish the voltage/current measurement, usingVOXL_ESC_PUB_BSTset to1.Then you will see the battery voltage and total current in battery status. (however if you are using APM, then you dont need that, set to 0)Alex
@Alex-Kushleyev We are using the supplied PM from ModalAI C11 dev kit.
Tested this morning. All VOXL2 systems good.
Arm/Disarmed-Good
Arm/Motor Kill-GoodArm/Manual-Throttle Increase on RC Controller, UAV motors do not respond proportional to RC inputs. When throttle is increases, motors perform a very slow increase in RPM that does achieve flight. RPMs stay very low.
Could you point us to the PX4 params that we should be looking at to verify proper configuration?
-
@Alex-Kushleyev We are using the supplied PM from ModalAI C11 dev kit.
Tested this morning. All VOXL2 systems good.
Arm/Disarmed-Good
Arm/Motor Kill-GoodArm/Manual-Throttle Increase on RC Controller, UAV motors do not respond proportional to RC inputs. When throttle is increases, motors perform a very slow increase in RPM that does achieve flight. RPMs stay very low.
Could you point us to the PX4 params that we should be looking at to verify proper configuration?
@rdjarvis , besides the PID tuning params, you need to make sure the min and max rpms in PX4 match what you have in esc params:
VOXL_ESC_RPM_MINandVOXL_ESC_RPM_MAX. did you set these PX4 params to 4000 and 40000? (btw in your test, was the motor able to reach 40K rpm? with my more aggressive prop, i think i had about 35K max).It is not a big deal if your ESC param in the ESC itself has maximum rpm that is higher than the motor can achieve. The ESC will just try to apply 100% power and will reach whatever rpm the motor can run at 100% power. But in PX4 params, you need to make sure that you set the maximum rpm that is actually achievable, otherwise PX4 will request the rpm that ESC cannot achieve and the drone will be less stable at maximum thrust.
-
@rdjarvis , besides the PID tuning params, you need to make sure the min and max rpms in PX4 match what you have in esc params:
VOXL_ESC_RPM_MINandVOXL_ESC_RPM_MAX. did you set these PX4 params to 4000 and 40000? (btw in your test, was the motor able to reach 40K rpm? with my more aggressive prop, i think i had about 35K max).It is not a big deal if your ESC param in the ESC itself has maximum rpm that is higher than the motor can achieve. The ESC will just try to apply 100% power and will reach whatever rpm the motor can run at 100% power. But in PX4 params, you need to make sure that you set the maximum rpm that is actually achievable, otherwise PX4 will request the rpm that ESC cannot achieve and the drone will be less stable at maximum thrust.
Yes, we confirmed the Params in PX4 QGC are identical to the Params in VOXL. Yes, Max RPM when performing calibration tests was 42k. I set it at 40k in both PX4 and VOXL-esc-params.
No response from throttle input when armed. We recalibrated the Radio and ensured RC Channel 3 was responding to Tx input.
-
Yes, we confirmed the Params in PX4 QGC are identical to the Params in VOXL. Yes, Max RPM when performing calibration tests was 42k. I set it at 40k in both PX4 and VOXL-esc-params.
No response from throttle input when armed. We recalibrated the Radio and ensured RC Channel 3 was responding to Tx input.
@rdjarvis , have you tried using actuator test to spin the motors (obviously be careful if props are on, or remove the props for the test). The actuator test should allow you to test the motors in the full range that you specified
-
@rdjarvis , have you tried using actuator test to spin the motors (obviously be careful if props are on, or remove the props for the test). The actuator test should allow you to test the motors in the full range that you specified
@Alex-Kushleyev Good morning.
Yes, Actuator tab in Vehicle Setup in QGC has VOXL ESC selected, motor directions are correct, and motor slider controls the motors.
Ch 3 RC Throttle Tx input does not apply actual throttle inputs when UAV is armed in any flight mode.
RC calibration was successful and RC Ch3 reacts correctly when Spektrum Tx mode 2 throttle stick is manipulated.
I will get you a log this morning when I'm clear of my meetings.
As always, thank you,
RDJ -
@Alex-Kushleyev Good morning.
Yes, Actuator tab in Vehicle Setup in QGC has VOXL ESC selected, motor directions are correct, and motor slider controls the motors.
Ch 3 RC Throttle Tx input does not apply actual throttle inputs when UAV is armed in any flight mode.
RC calibration was successful and RC Ch3 reacts correctly when Spektrum Tx mode 2 throttle stick is manipulated.
I will get you a log this morning when I'm clear of my meetings.
As always, thank you,
RDJ@rdjarvis, yes lets get a log where you are in manual flight mode (thrust, roll, pitch, yaw control) and you arm the drone and just move the thrust stick up and down a few times trying to take off. As a separate test, at idle throttle try to move roll and pitch stick to see the response from those inputs.
It looks like a px4 configuration issue but i am not sure what exactly.
-
@rdjarvis, yes lets get a log where you are in manual flight mode (thrust, roll, pitch, yaw control) and you arm the drone and just move the thrust stick up and down a few times trying to take off. As a separate test, at idle throttle try to move roll and pitch stick to see the response from those inputs.
It looks like a px4 configuration issue but i am not sure what exactly.
-
@Alex-Kushleyev Awesome, will do.
Thank you,
RDJAlso please check the value you use for the following param THR_MDL_FAC. Just curious about the current value, it should be close to one (0.7-0.8) for rpm control, but i can help you compute it exact value.
Thrust Curve Compensation through THR_MDL_FAC
As suggested in the MC Tuning Guide, I try to compensate thrust nonlinearities through the THR_MDL_FAC parameter, which is described as follows: THR_MDL_FAC (FLOAT) Thrust to PWM model parameter Comment: Parameter us…
Dronecode Forum | Open Source Drone Development (discuss.px4.io)
-
Also please check the value you use for the following param THR_MDL_FAC. Just curious about the current value, it should be close to one (0.7-0.8) for rpm control, but i can help you compute it exact value.
Thrust Curve Compensation through THR_MDL_FAC
As suggested in the MC Tuning Guide, I try to compensate thrust nonlinearities through the THR_MDL_FAC parameter, which is described as follows: THR_MDL_FAC (FLOAT) Thrust to PWM model parameter Comment: Parameter us…
Dronecode Forum | Open Source Drone Development (discuss.px4.io)
-
@Alex-Kushleyev How do I upload a log? The forum say I do not have permission.
Upload it here and you can view results too. https://review.px4.io/ . The official flight review does not plot our custom esc data, but i will let you know how to view it later. I can download the log from the link above after you upload it and share a link
-
Upload it here and you can view results too. https://review.px4.io/ . The official flight review does not plot our custom esc data, but i will let you know how to view it later. I can download the log from the link above after you upload it and share a link
-
Upload it here and you can view results too. https://review.px4.io/ . The official flight review does not plot our custom esc data, but i will let you know how to view it later. I can download the log from the link above after you upload it and share a link
-
@rdjarvis said in Motor issues when running ESC calibration:
It seems you have something wrong with the thrust control (some filter?) the motors respond fine to roll / pitch but not thrust. see plots below showing RPMs. The ESC is tracking the desired RPMs well (actually a bit higher than desired at high rpm, but that is ok for now)
-
@rdjarvis said in Motor issues when running ESC calibration:
It seems you have something wrong with the thrust control (some filter?) the motors respond fine to roll / pitch but not thrust. see plots below showing RPMs. The ESC is tracking the desired RPMs well (actually a bit higher than desired at high rpm, but that is ok for now)
(look at how desired motor outputs and desired rpms rise very slowly when you increase the desired thrust, never reaching enough rpms to hover)
-
(look at how desired motor outputs and desired rpms rise very slowly when you increase the desired thrust, never reaching enough rpms to hover)
@Alex-Kushleyev Thank you. We understand that the desired inputs and actual input are not the same.
We have no filters. All ModalAI Hardware and Software are being used. ModalAI PX4 QGC Skin is used. Spektrum Rx/Tx DSMX as suggested by ModalAI is used.
We have purchased 2 ModalAI FPV 4n1 ESC and multiple VOXL and VOXL2 Dev kits to keep all hardware in the same ecosystem for easy integration and R&D for our product.
There is a disconnect between the FC/ESC comms on throttle Ch 3.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login