Sensor for testing DC motors

The company PCE Process Control Electronic GmbH has developed a sensor for non-contact testing of DC motors. The residual magnetic field of the pole housing is detected and evaluated. During start-up, the direction of rotation is determined, which is difficult with DC motors without contact to the axis. The direction of rotation can depend both on the polarity of the power supply and on the stator magnetic field. 

After the run-up, the idle speed is measured. The system also checks for armature faults such as lamella closure and interruption. The results can be read out via an RS 485 interface (I/O standard). An adaptation to further interfaces is planned.