tjm wrote: D.C armatures particularly in very small motors such as this usually wont develop enough torque to drive a load if there is a fault in the armature, shorts in the comm or shorted turns often result in the motor cogging, stalling and normally arcing at the brushes. Ive dealt with all kinds of motors over the last 40 years from tiny to the size of your house and if you get an electrical fault you also get a distinct burning smell, only electricians or armature windings with motor experience will know what im talking about. If its not old then worn brushes are unlikely and if its developing enough power to squeeze a block its unlikely to be the motor as you said Dave. But even when you have been in the game that long your not always right. |
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