Summary

DC Motor Tests

This page is an overview of iTIG DC motor tests. For details about specific tests, including types of DC motor tests and iTIG test measurement techniques used during DC motor tests, see the method descriptions for each test and measurement.

Which DC motor tests are available?

DC motor testing is done with the same instrument used for AC motor tests. The tests used are also the same. Since multiple coils and windings are tested, the procedures for doing the tests are different.

Multi-coil tests are available. This semi-automatic process makes testing multiple coils and DC armatures fast and easy. Options for presentation of winding resistance and surge test data include bar graphs.

Test armatures (rotors) and single coils using iTIG DC Motor Testing Accessories:

Surge test across a span of several bars on a DC armature using the Armature Test Fixture (ATF-11).
Surge comparison test bar-to-bar on a DC armature using the Armature Bar-to-bar Surge Test accessory (ABT).
Surge test very low inductance coils also using the Armature Bar-to-bar Surge Test accessory (ABT). See Low Inductance Surge Tests for more detail.
Measure resistance in microohms (µΩ) on bar-to-bar on armatures with the Armature Resistance Probe Set accessory (ARP-02).

The iTIG model D winding analyzer automatically detects the percentage of equalization that can change the resistance from one measurement to the next.
The instrument identifies any resistance measurement that exceeds the set failure limit.
If there is more than one resistance level bar-to-bar, more than one set of averages will be calculated. For example, with 66% equalization, two sets of averages are used. The winding analyzer calculates the percent difference in the resistance for each measurement using the proper average.