DC Motor heavy sparking
DC Motor heavy sparking
(OP)
Dear friends,
Currently i am facing a problem With DC Motor.problem is mentioned below:
1. DC motor was overhauled.Rewound Field Interpole and armature windings.all windings are in good condition with 2000 Mohms value.
2.Polished and skimmed the commutator,,drop tested. found ok.
3.Brush and carbon holder is in good condition.
Now the problem is motor is giving heavy sparking on load. Application of motor is boom hoist motor.
On No load motors runs smooth no sparking,no vibration.
Why it's giving heavy spark on load and we opened twice the motor but not able to get the root cause.
Anything else that i need to check?
Currently i am facing a problem With DC Motor.problem is mentioned below:
1. DC motor was overhauled.Rewound Field Interpole and armature windings.all windings are in good condition with 2000 Mohms value.
2.Polished and skimmed the commutator,,drop tested. found ok.
3.Brush and carbon holder is in good condition.
Now the problem is motor is giving heavy sparking on load. Application of motor is boom hoist motor.
On No load motors runs smooth no sparking,no vibration.
Why it's giving heavy spark on load and we opened twice the motor but not able to get the root cause.
Anything else that i need to check?





RE: DC Motor heavy sparking
If really heavy sparking; not unusual that today's winder shops connect interpoles with wrong polarity. Have seen that twice very recently.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC Motor heavy sparking
RE: DC Motor heavy sparking
If there is a distinct "growl" - it is probably the drive. Have you checked the gating pulses for symmetry?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC Motor heavy sparking
Bill
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"Why not the best?"
Jimmy Carter
RE: DC Motor heavy sparking
What causes motor brush sparking under load and not under no load? You need to get a handle on this before going forward. I would venture sparking loaded and not unloaded means you are putting more V*A (POWER) thru brushes than they were designed for (assuming the motor is not defective due to winding issues or brush location issues). There is a max they can transfer, the higher the power transferred, the higher the sparking. Maybe time to get back to the basics of it all to help identify where to look?
1) but what is motor amps rating?
2) what are you pulling?
3) If exceeding rated armature amps, time to verify field volt is proper for the speed you are running when sparking? If not, then the motor will pull way more amps and spark too....
Why did you send motor out to begin with?
Same sparking reason? Other?
does output shaft rotate easy with motor off? Ie., do you have a mechanical problem causing hi current (torque) draw?
You really need to rule out these questions before jumping into blaming the motor or drive....
www.KilroyWasHere<dot>com
RE: DC Motor heavy sparking
- armature wound retrogressive instead of progressive (or visa versa)
- interpoles wound with wrong polarity
- interpole circuit reversed
- armature circuit reversed
Under these conditions there will be no sparking when operated at no load because the current through the armature and interpoles is too low to have any effect. Under load, the incorrect polarities will cause the interpoles to boost the armature reaction instead of bucking it, therefore shifting the armature neutral away from the brush position.