Asynchronous motor: exploded starter capacitor

[Christophe]

Some questions for electricians ...

When does the starting capacitor of a single-phase asynchronous motor have inflated and exploded, does that mean there is another problem with the motor? So what are the checks to be done before replacing the capacitor? If not that they can be the causes of this break of the capacitor?

Finally, is it possible to put a capacitor a little stronger than the original one to improve its life?

Thank you

[elephant]

Christopher said:

When the starting capacitor of a single-phase asynchronous motor has inflated and exploded, does that mean there is another problem with the motor? If so, what are the checks to be done before replacing the capacitor? Otherwise they can be the causes of this capacitor break

?

Possibly power surge or false contacts (hence extra currents) in the contactor. possibly a too hot atmosphere.

Finally, is it possible to put a capacitor a little stronger than the original one to improve its life?

if you keep the same capacity, no problem:
if you have a much higher service voltage, so much the better.

these capacitors are usually electrolytic, so a priori fragile

[Other]

Some questions for electricians ...

When does the starting capacitor of a single-phase induction motor swell and explode, does that mean there is another problem with the motor? So what are the checks to be done before replacing the capacitor? If not that they can be the causes of this break of the capacitor?

Finally, is it possible to put a capacitor a little stronger than the original one to improve its life?

Thank you

Hello

There are two kinds of motor with differrent capacitor
1- the electrolytic start capacitors which are in series with the start winding are energized only at the start of the motor so for a short time, the capacity of the capacitor determines the starting torque of these motors single phase, the voltage must be respected the capacity in general is from 80 to 150microfarad depending on the power of the engine,
the most likely cause is that the start contacts either stay on for too long or the motor does not succeed in taking these RPMs these capacitors do not take long to be powered by AC.
If it is a motor that does not force the start can simply remove the capacitor and connect the two wires together it takes longer to take its speed ..
These capacitors are in a black plastic case when it fails it explodes literally ..
2- the Run capacitor is a more modern high efficiency motor capacitors are always on the winding and energized it is of the AC paper type the case is usually metallic aluminum their capacity must be precise enough to some microfarat near, the engines are long to start and their cos is better, on these motors the capacitor is mandatory for the engine to run ..

Andre

[Christophe]

Thank you for the explanation, the condo was 16 microFarrad (while the engine is 1100 W) so from what you say Andrew, it would correspond to your 2): a capacitor operation.

The title of the subject is no longer good ...

But how to be sure that there is not a problem elsewhere on the engine?

[Other]

Hello

Thank you for the explanation, the condo was 16 microFarrad (while the engine is 1100 W) so from what you say Andrew, it would correspond to your 2): a capacitor operation.

The title of the subject is no longer good ...

But how to be sure that there is not a problem elsewhere on the engine?

16 microfarad is a condenser run, replace it and try it, see it is good voltage 1 6 is a standart
when the engine is running amperage, if it consumes excessively does not insist there must be a connection problem either it is plugged in low voltage 110volts and used under 220volts, or something similar
Maybe it's not a paper capacitor,
an electrolytic is not suitable for this purpose.

Andre

[snourf]

Some questions for electricians ...

When does the starting capacitor of a single-phase induction motor swell and explode, does that mean there is another problem with the motor? So what are the checks to be done before replacing the capacitor? If not that they can be the causes of this break of the capacitor?

Finally, is it possible to put a capacitor a little stronger than the original one to improve its life?

Thank you

Hello

There are two kinds of motor with differrent capacitor
1- the electrolytic start capacitors which are in series with the start winding are energized only at the start of the motor so for a short time, the capacity of the capacitor determines the starting torque of these motors single phase, the voltage must be respected the capacity in general is from 80 to 150microfarad depending on the power of the engine,
the most likely cause is that the start contacts either stay on for too long or the motor does not succeed in taking these RPMs these capacitors do not take long to be powered by AC.
If it is a motor that does not force the start can simply remove the capacitor and connect the two wires together it takes longer to take its speed ..
These capacitors are in a black plastic case when it fails it explodes literally ..
2- the Run capacitor is a more modern high efficiency motor capacitors are always on the winding and energized it is of the AC paper type the case is usually metallic aluminum their capacity must be precise enough to some microfarat near, the engines are long to start and their cos is better, on these motors the capacitor is mandatory for the engine to run ..

Andre

Hello, can someone tell me how to recognize the starter winding? I have one of twenty ohms and one of seven ohms. It is a gardena water pump that I recovered but the capacitor was disassembled and I do not know not how to connect it.
merci beaucoup

[boubka]

the starting winding has the highest resistance.

a link to know the main about mono engines.
the subject and so vast for the particular engine that it is difficult to make an exaustive list

http://webelec.waika9.com/robertg/motmono.html#TYPE

[boubka]

condos wake up badly and there are manufacturing defects (especially on the tolerance)
the explosion of these condos of low quality and frequent for no apparent reason
one of the solution and to put a condo with a tension of service very sup at its initial tension (ex: 400 or 600volt for 230)
do not confuse ts: service tesion and tp: peak voltage
for the capacity given the tolerances + or- 20 per cent no problems.

[boubka]

remove the start-up condo from an engine that does not have a permanent condo returns in most cases to grill the engine

[boubka]

retif: it can be removed without connecting the son together. This may be valid for testing the engine empty but you have to start the engine by hand and be careful it goes in the direction or it is launched.
do not use this "manual" starting mode on a motor to which a load is going to be connected (eg: saw) there is a big risk because when the motor has reached its maximum load, it reverses its direction of rotation on its own. if the protection comes loose, it's okay ... otherwise ... ay ...