Many universal motor malfunctions are caused by wearing down of the carbon brushes, the soft blocks of carbon that complete the electrical contact to the motor’s commutator. When these brushes become worn, the motor will spark, and electrical contact may be incomplete.
How do I know if my motor brushes need replacing?
As a general rule, if either brush has worn to about a quarter inch long, it is time to replace it. If the carbon (a brush is essentially a carbon block with a metal spring tail) shows any signs of breakage, crumbling, or burning, the brush needs replacing.
How long do motor brushes last?
As an estimate, 7,500 hours brush life is normal for general purpose, medium horsepower DC motors with good commutator film with commutator surface speeds in the range of 2,500 to 4,000 feet per minute. The minimum life might be 2,000 to 5,000 hours with 10,000 hours being about maximum.
Do motor brushes wear out?
In most motors, they seem to last forever because they get so little wear. In motors that are used often or under heavy loads, like routers, for example, they do wear down. As long as the motor is running properly and seems full of pep, there is probably no good reason to replace the brushes.
How do you check the brushes on a motor?
Locate the two brush housings. They should look like a long, rectangular tube on opposite sides near the top of the motor, pointing toward the center. Inspect one of the brush housings. There should be a screw or a clip on the end of the housing that, once removed, will allow the spring-loaded brush to be removed.
How do I know if carbon brushes need replacing washing machine?
If the machine is filling and emptying as normal but the drum isn’t turning, or if it’s making some sort of spluttering noise, or if you can see sparking coming from underneath the front of the machine these are all likely to be caused by worn brushes and you’ll need to replace them.
How do I know if my armature is bad?
Amp Draw. Checking the amp draw of your starter is another simple method to test for a bad armature. The specifications may vary from vehicle to vehicle so you will need to check your car manual for the normal amp draw range. If the amp draw is overly high, that is a sign of a bad armature.