DC motors: Final testing procedures without a dynamometer
EASA's Engineering and Technical Support Department has received many calls over the past few months concerning repairs on DC motors. Most callers have asked for tips on troubleshooting to make sure repairs are handled correctly. Prior to assembly, all windings should be tested for shorts, grounds and correct polarity. After a DC motor is assembled and ready to test run, a few simple checks will greatly reduce the chance of motor problems. The following procedures should be especially helpful to those shops that don't have a dynamometer.