Bad new CIM motor
 

When we went to fire up our practice chassis for the first time today the left side would not turn and was popping breakers. We traced the problem down to a locked up CIM motor.

This was a brand new never ran motor. Upon inspection we found a purple substance, corrosion, and a hard substance on the side of the armature (this is what was preventing the motor to turn.)

Any ideas?

Re: Bad new CIM motor
 

looks kind of like the epoxy they use to balance the armature

Re: Bad new CIM motor
 

how weird... 3357 has a brand new CIM that is locked as well, we have a surplus of CIMS so i didnt take the time to tear it apart. I will take the time today after i turn the robot over to the next subteam! see what i find.

Re: Bad new CIM motor
 

The innards of that CIM look really bad -- not like any I have seen before. Maybe King Kong opened it up and sneezed on the armature? :confused:

The blue stuff is for balancing, and is seen on every CIM that I have ever opened. That other stuff should not be in there.

Re: Bad new CIM motor
 

Looks like a quality escape to me.

Re: Bad new CIM motor
 

What's the part number* and where did you get it?


* i.e. per R32 Table 4-1

FR801-001
M4-R0062-12
AM802-001A
217-2000
PM25R-44F-1005
PM25R-45F-1004
PM25R-45F-1003
PMR25R-45F-1003
PMR25R-44F-1005

Re: Bad new CIM motor
 

It looks like somebody tried to lubricate it with raspberry yogurt. The corrosion from that substance may not be removable.
Do you have any plans for cleaning it out and reassembling it?

Re: Bad new CIM motor
 

Re: Bad new CIM motor
 

No plans for re-assembly, I wouldn't be able to trust it.

Re: Bad new CIM motor
 

I wouldn't trust it either. That said, if it was cleaned a bit, it would make a good training tool.

Re: Bad new CIM motor
 

Could it be adhesive that is used to hold the magnets in? Perhaps someone or some machine was a little overzealous with their application of the stuff. I have also heard of adhesives being used to glue the plates which make up the armature together to inhibit eddy currents. Could it be a misapplication of this adhesive?

Re: Bad new CIM motor
 

Just goes to show you, workers in China can make mistakes.