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直流电机电流信号分析

Introduction

Evaluate a 10 HP, 1.0 SF, Ins F, 1750 RPM, 240 V, 33 Amp armature, 240 V, 1.23 Amp field DC motor with DC driver output. The evaluation reveals DC drive failure and poor brush condition.

discuss

When testing a DC motor using the ALL-TEST PRO™ OL (ATPOL) motor current signal analyzer, it is recommended to use the AT6000 DC clamp for analysis. Data is acquired directly from the armature leads.

Select the operating speed and observe the current ripple. Changes in the current ripple waveform indicate a problem with the driver, which can be identified by the harmonics of the power line frequency and the number of thyristors multiplied by the power line frequency (Figure 4).

Figures 1 and 3 illustrate issues related to power electronics and brushes.