The water pump stops accidentally

往事随风飘散

The water pump stops accidentally [Copy link]

 

As the title says, the pump will occasionally stop after being powered on, and can work normally after being powered on again after being powered off. This phenomenon has occurred several times during testing. There is no foreign matter inside after disassembling it, and the problem cannot be detected after it is reassembled. So I would like to ask you what is wrong?

It can only be disassembled like this, the rest cannot be disassembled

maychang

"The water pump will occasionally stop after being powered on, and can work normally after being powered on again after being powered off."

How big is the water pump? Should the fish tank use a low-voltage DC water pump, or should industrial and agricultural production use a three-phase AC water pump?

往事随风飘散

maychang posted on 2021-9-24 12:10 "The water pump will stop occasionally after power is turned on, and it can work normally after power is turned on again after power is turned off." How big is the water pump? The water pump using low-voltage DC power in the fish tank, ...

The picture was not posted just now, but it is now, please take a look

maychang

The past is gone with the wind. Published on 2021-9-24 12:24 The picture was not posted just now, but it is now, take a look

Small water pump powered by 24V DC.

Since you can disassemble it, you should pay attention to two points after disassembly: one is whether the bearing is blocked, and the other is whether the winding part has water in it. Whether the bearing is blocked can be felt by rotating the impeller or the motor shaft by hand. Whether the winding part has water in it can only be carefully observed with the naked eye.

1992sd

There is a poor contact.

maychang

The past is gone with the wind. Published on 2021-9-24 12:24 The picture was not posted just now, but it is now, take a look

Electric motors rarely break down, and when they do, it is most likely that the electronic circuit that controls the motor is at fault. If there is no electronic circuit that controls the motor, then of course only the motor will break down. If the motor does not break down after it is disassembled, it may be that the bearing angle is off or foreign matter has entered. Disassembly eliminates these problems, and the stalling phenomenon will no longer occur.

往事随风飘散

maychang posted on 2021-9-24 13:00 Electric motors rarely fail, and most of the failures are in the electronic circuit that controls the motor. If there is no electronic circuit to control the motor, of course only the motor may...

I have put the disassembled pictures up, please take a look

maychang

The past is gone with the wind. Published on 2021-9-24 13:51 The disassembled pictures are posted here, please take a look

Nothing much can be seen from these two pictures, except that the windings are not immersed in water.

往事随风飘散

maychang posted on 2021-9-24 14:05 Nothing can be seen from these two pictures, except that the windings are not soaked in water.

Yeah, I can't find the reason.

tagetage

If it is a quality issue and cannot be repaired, just replace it.

Gen_X

Support the above view.

If there is a chance of rescue, it is recommended that when a problem occurs, turn off the power, do not touch any circuits or the pump itself, and measure the resistance at the motor terminal.

Can it be ruled out whether it is repairable?

chunyang

When a fault occurs, test the motor supply voltage online to determine whether it is a problem with the motor/pump or the front circuit. If it is a problem with the motor, use a resistor to measure to determine whether there is a contact problem, and then disassemble and inspect.

w494143467

This phenomenon should be able to detect the problem. Could it be a program problem?

se7ens

Focus on PWM and FG signals

It is recommended to power on directly and try to input DC directly to PWM to see if it works. If it doesn't work, adjust a PWM signal and input it yourself

As for the FG signal, it depends on the product definition.

This can only determine whether it is a problem with the motor itself.

Of course, it is also possible that the internal Hall device or driver has reached over-temperature or short-circuit protection conditions.

Gen_X

I have the same pump. It seems that this pump is required to work underwater. If it is not in water, it may overheat.

It is possible that the motor's internal overheat protection (switch) has activated.

After a while the temperature switch was restored and everything was fine again.

往事随风飘散

Gen_X posted on 2021-12-2 10:05 I have the same pump. It seems that this pump is required to work underwater. If it is not in water, it may overheat. It may be the internal overheating protection of the motor (...

Is that so?