Differences between Universal Motor Vs. AC Motor Vs. DC Motor ? thanks

Differences between Universal Motor Vs. AC Motor Vs. DC Motor ?

What are the faults that often come across while dealing universal Motors ?

thanks

this should help you


Universal Motors

AC Motors and Generators
DC Electric Motors
**broken link removed**
**broken link removed**

Hi,
This page also has a good start to well explained lessons for motors.
Electric motor - Wikipedia, the free encyclopedia

thanks for your replies but nobody really explain the faults that generally come across while troubleshooting universal motors ........!

the universal motors most often have brush problems.

Brush Problems , then, how to diagnose or troubleshoot it ?

Hi danish,

What are the faults that often come across while dealing universal Motors ?

Click to expand...

Sorry I skipped this.
PLEASE BE SURE TO PUT OFF THE POWER BEFORE WORKING ON THE ELECTRIC CIRCUITS.
Here is an image for giving an idea of the motor structure.


General faults are very few in these motors but no limit, as every fault may be a new fault.

If motor does not rotate:

<> Confirm the power (check the line voltage is present) and the motor circuit is not broken in general due to Fuses or Circuit breakers.
<> Some times there are Thermal fuses integrated inside the stator winding which go off at the specified temperature. This is to avoid the motor winding burning by overheating, Check them if there are.
<> Check for the Carbon Brushes for proper sizing and proper spring tension for good contact to the commutator.
<> Check for motor jamming.

If motor is overheating:

<> Check for motor movement rigidness with hand.
<> A jammed bearing, check it.
<> Overloading, check for proper load on the motor.
<> Improper cooling caused by blocked vent holes or cooling fins proper fitting.

These were a few causes and faults can be indicated in general. The environment where the motor is working also effects a lot on the motor efficiency but all these go for a separate discussion.
Hope it helps a bit. Any further question is welcomed.

Raza said:

Hi danish,


Sorry I skipped this.
PLEASE BE SURE TO PUT OFF THE POWER BEFORE WORKING ON THE ELECTRIC CIRCUITS.
Here is an image for giving an idea of the motor structure.
View attachment 61053

General faults are very few in these motors but no limit, as every fault may be a new fault.

If motor does not rotate:

<> Confirm the power (check the line voltage is present) and the motor circuit is not broken in general due to Fuses or Circuit breakers.
<> Some times there are Thermal fuses integrated inside the stator winding which go off at the specified temperature. This is to avoid the motor winding burning by overheating, Check them if there are.
<> Check for the Carbon Brushes for proper sizing and proper spring tension for good contact to the commutator.
<> Check for motor jamming.

If motor is overheating:

<> Check for motor movement rigidness with hand.
<> A jammed bearing, check it.
<> Overloading, check for proper load on the motor.
<> Improper cooling caused by blocked vent holes or cooling fins proper fitting.

These were a few causes and faults can be indicated in general. The environment where the motor is working also effects a lot on the motor efficiency but all these go for a separate discussion.
Hope it helps a bit. Any further question is welcomed.

Click to expand...

thanks for sharing this golden info with me

how to test/check/diagnose whether stator winding is good or working well ?
how to test/check/diagnose whether Armature winding is good or working well ?
How to test/check/diagnose Commutator is good or working well ?