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Forums
Engineering
Electrical Engineering
Troubleshooting a DC Compound Motor: Negative Effects and Solutions
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[QUOTE="kenneth edmiston, post: 6212105, member: 642607"] The DC drive has an output for the armature, and a separate output for the field. I’m not getting much information about the incidents, but I do know that at least 3 of the times it blew fuses at 300 feet per minute, 150 fpm, and 120fpm. All with “light load” as in, they were pulling thin gauge metal. Rpm of the motor is 650/1950 at 500v arm and 150v field. I’ve disconnected the coupling and ran resistance with multimeter through the commutator, rotating the shaft. And did the same with a 1000v meg with respect to ground. I’ve megohm tested all the field windings also. As well as tested other components ie snubber circuit, reactor etc. I know there is a culprit hiding somewhere, I just can’t put my finger on it yet. This motor pulls sheets of metal through a splitter machine. Variable speed control is a must, but apparently starting torque is not since they left the series field open. I’ve verified another motor in a separate line is wired identical (open series field) I was also told that the motor is dropping rpm uncommanded which led me to believe the drive is sending incorrect outputs, or the load was too high and torque too low. Or a short winding etc. ...the drive is 9 months old, the motor has been rewound in the last year, and I verified resistance. Could connecting the (currently shunt wound) motor into compound potentially curb excess armature current while maintaining proper speed control? [/QUOTE]
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Engineering
Electrical Engineering
Troubleshooting a DC Compound Motor: Negative Effects and Solutions
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