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What would cause a brushed motor to lose strength?

Hi gang,
My wife used her mixer to make two pounds of dough for years, but recently the motor would struggle and eventually stop.  The only way to use the mixer now is to make smaller batches of dough.

I took a look under the hood, and all seems OK.  The brushes on the motor are clean and making good contact, the cooling fan moves air over the motor as it should, all the gears were well lubricated and moved freely, nothing was broken.

What made the motor lose it's mojo?  Is there a way for me to make it strong again?

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rickharris2 years ago

Dirty commutator.

Dirty brushes.

If belt drive, slipping belt under load.

A burned out rotor winding. You should be able to check with a multi meter set to resistance.

Morgantao (author)  rickharris2 years ago

Hmmm... In other words, pretty much anything :)

I know it's not the belt, that only slipped when using the meat grinder attachment (It's a toothed belt, so when it slips the whole device looks like it's possessed).

The motor only loses strength under heavy load. Would dirt cause such a problem? They seem clean to me, but I can try cleaning it a bit.

A bad winding was my guess, I have to check it out.

Brushes are your best bet. Over time they wear out from rubbing on the commutator. They will either be worn out to the point where they don't work, or the dust from them wearing down has gummed everything up Or the spring that pushes the brushes into the commutator is weak or broken. I think if it was the winding it would never work.

iceng2 years ago

A mixer has strong vibrating mech jarring that armature.

It's not unusual to break a wire in that armature winding and that will kill the torque.

You could pull the armature and place it on a growler

http://www.tutorsglobe.com/homework-help/electrica...

to see if it the armature is the cause.

Motor bearings may be bad and siezing up.

Morgantao (author)  mpilchfamily2 years ago

Bearings look good, there's no friction or wobble....

Never thought of it though :)