Analyse de la signature du courant du moteur à courant continu
Introduction
Evaluation of a 10 HP, 1.0 SF, Ins F, 1750 RPM, 240 V, 33 amp armature, 240 V, 1.23 amp field DC electric motor, from the DC drive output. A DC drive fault and poor brush condition were reported.
Discussion
When testing a DC electric motor with the ALL-TEST PRO™ OL Motor Current Signature Analyzer (ATPOL), it is recommended to use the AT6000 DC clamp for the analysis. Data is collected directly from the armature wires.

The running speed is selected and the current ripple is visualized. Variations in the current ripple waveform indicate drive problems that can be confirmed as harmonics of the power line frequency and the number of SCRs multiplied by the power line frequency (Figure 4).
The signatures, Figure 1 and Figure 3, indicate problems related to power electronics and brushes.


ALL-TEST PRO™ MD Kit
The ALL-TEST PRO™ MD kit consists of the following items:
- ALL-TEST PRO™ OL Motor Current Signature Analyzer
- ALL-TEST PRO™ 31 and ALL-TEST IV PRO™ 2000 motor circuit analyzers
- EMCAT engine management software
- ATPOL and Power System Manager software modules for EMCAT