BLDC stops running after some time


I have an BLDC motor connected to a WS55-220 motor driver.
The motor istself works fine, but after 2-5min of running the motor stops and the drivers LED is blinking red.

I have no clue what the problem could be. The Driver & Motor are supplied by 15A, and when measuring the power, the motor never draws more than 7-8A.
So power should be enough.
And the motor load also doesn't change after it's accelerated.

Anyone experienced something similar and has an idea what it could be?

Greetings, David

We need more information.

Motor: "ACT 42BLF02", 24V 52W 3000rpm max
Driver: "WS55-220", can regulate 20-50V with rated current 12A
Power Supply: " Meanwell Biltron" 24V 15A

The motor has to move about 5kg of weight. It's accelerating fine to the wanted 600rpm.
But after a few minutes, sometimes 2, sometimes 10, when it's already at 600rpm it stopps.

Show us a good schematic of your proposed circuit.
Show us a good image of your ‘actual’ wiring.
Give links to components.

In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.

Use the </> icon from the ‘reply menu’ to attach the copied sketch.

Right now I haven't even connected the driver/motor to my arduino.

I only have a bridge between GND & EN, to enable the driver, and a potentiometer to give it the speed (0-10V).

power supply

Do any of the components get hot ?

Are all your wiring connections good and solid ?

What wire gauge are you using ?

How much current are you pulling from the power supply ?

How is it moving the weight?
Lifting it like a hoist, if so, how fast?
Driving the wheels of a cart, if so how fast, on level ground or an incline?
Driving a conveyor belt, how fast?
Something else...?

At full speed (3000rpm) the motor gets pretty hot, but at the 600 rpm not, no.
All wires are equipped with ferrules and the power & motor wires are 1,5mm.
From the power supply I'm pulling 7-8A when accelerating, and about 2A afterwards.

It's used in a Test stand for TPMS sensors.
The motor moves a disc with 4 pressure chambers on each side.

From the manual.
20190508220426SKU600181WS55-1801.pdf (215.1 KB)

Do you have a DMM?
Have you measured the supply volts when the fault occurs?
How did you measure the 7-8A load?

Can you please post a picture of your project, showing your driver and connections?

Thanks.. Tom... :smiley: :+1: :coffee: :australia:

I suspect its one of the protections kicking in, over voltage, over current or over-heating of the driver. The timescale of minutes suggests overheating.

Please provide links to datasheets or links to product pages when describing your hardware, rather than make us all spend time searching for these (and not necessarily getting the correct matches)...

I vote for overheating. You may not notice the problem because of intertia how heat transfered in steel, but magnets already too hot or hall sensors are. If such motor draws 7 amps in average, that's definetly a lot for such tiny one. I have 78 watts bldc of nema 17 size and it get hot after 10 minutes of running with it's nominal 3.16 amps current. And by hot i mean external temperature is almost 80 degrees, so internal even higher and deadly for magnets.

I got myself an Digital-Multimeter now. Measuring the current between the power supply + and the drivers PWR +, it only pulls 1A max. About 1A when accelerating and afterwards 0.7A.

The supply voltage stays at 24V, even when the failure occurs and afterwards.

The 7-8A I haven't measured, we have used a bigger stationary power supply in school before, because we thought we wouldn't have enough A available. The stationary power supply has an display showing the current current pulled. It showed us the 7A. But this was with the full 3.000rpm, after that the motor got the mentioned 120°.

When using it with 600rpm now, it pulls 1A and we still have the failure. We measured the temperature while the motor was spinning and it has 54°.

When the failure occurs the light blinks red and green endless. So more than 2 times.

The orange cable comes from an adjustable power supply now, just to give it the 0-10V speed level for testing.
The blue & yellow cable off the left side, are the vcc +5V & GND for the hall sensors, because our driver model doesn't have the vcc pin for the hall sensors. The 5V come also of the adjustable power supply.
All grounds are connected together & the rest of the circuit (arduino, display, valves, pressure sensors,...) aren't connected.

I really don't know what to try else anymore :frowning:
So thank you very much for your help!

the driver doesn't get hot at all.
The measured voltage of the driver is always 24V and the current stays continously at 0,7A when it has accelerated.
power supply

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