ESC Cutoff Problem

Other Hardware General Electronics
1

Hello Everyone,

I recently work ESCs and BLDC motors for my senior design project. My aim is to make propeller optimization. I built a static test stand that can measure propeller thrust.

I am using Readytosky 40A ESC with Sunnysky 900 kv BLDC motor. ESC is powered by 120 W power supply. An Arduino used to generate PWM signals to control the ESC.

In the past, When a propeller’s power consumption reaches the 120 watt, the ESC was stoping the motor and start “beaping”. But recently it started to not stopping the motor when it reaches the 120 W. The code i used and the wiring is the same. I don't think i damaged the ESC somehow.

İf is there any high voltage or current cutoff, how can ı configure it ?

What could it be the problem ?

I will very appriciated if you help me on this matter.

2

If something changes, something changed.

You may have damaged the ESC. You may have inadvertently caused its settings to change.

I was gonna tell you all about BLHeli and how to check and set all the parameters that the ESC firmware uses, but saw this in the ad copy:

Note: This ESC is not able to flash the firmware.

Which leaves the question of how (or if) any operating parameters stored on the ESC can be reset, verified or adjusted.

Did you find a document describing how the ESC is calibrated and otherwise adjusted to circumstances?

a7

1 Like
3

I will take a SWAG and say the problem is probably in the power supply. 40 *12 is 480 Watts. Running it at capacity with the ability to go over is asking for problems. You need at least a 480 Watt supply, 500 or better would be better. Doing this can cause all types of weird things to happen, transients etc can change memory devices. If you can use a CAR battery try that and see what happens or a much larger power supply.

4

Thanks alto777!

Unfortunately ı couldnt find any documentation on the internet but ı emailed the manufacturer. Hopefully they will reply. I made the calibration by assigning and trying different pulses for its set, start and maximum state.

Thanks gilshultz!

I dont get it why ı need to use a bigger capacity supply because ıt has to able to work with 120watts. I was able to working with it until today...

5

@mericatay

Lipo batteries built for r/c "toys" can do 40 A at 12.6 V nominal without too much trouble, also.

Just check the C rating to be sure of a particular battery if you go that direction.

a7

6

I am actually using fixed power supply with 12V and 10 amps

7

Ask yourself how much power does that motor need to start when there is no motion. I would expect the starting current to be from three to ten times its running current. That is basic physics as a motor when rotating generates a back emf, when it is stalled it is generating nothing. As it comes up to speed it generates more energy reducing its requirement for the external source to supply it. You may fried the motor and the ESC, I cannot be sure unless it is tested.

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