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Concentric and Lap Wound Windings Effect on a RIC

Concentric Wound motors are usually machine wound with individual coils stacked rather than lapped. In Lap Wound motors, as the name implies, the coils overlap each other until the last one joins the first.

How do these different motor winding configurations affect the PdMA® MCE® test data? When conducting a Rotor Influence Check (RIC), if between phases it appears you have large differences in minimum and maximum inductance values (“stair stepping”) thus indicating possible misalignment, it is good practice to continue testing to the second pole group for verification. If the second pole group has similar stair stepping minimum and maximum inductance values between phases, it is an indication of a concentric winding. Conversely, a healthy Lap Wound motor will usually indicate equal minimum and maximum inductance values between phases and throughout each pole group.

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You are invited to submit an Electric Motor Testing Tip of your own and receive a free PdMA® mug or hat if we publish it! Contact Lou at lou@pdma.com.

 
 

Concentric and Lap Wound Windings Effect on a RIC

September 29, 2014
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Why MCEMAX®?
Power Circuit Fault Zone
Power Quality Fault Zone
Rotor Fault Zone
Stator Fault Zone
Air Gap Fault Zone
Insulation Fault Zone
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Insulation Case Study

 

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The PdMA® training schedule for 2013 has been posted.
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Introducing MTAP3
The affordable MTAP3 offers the ability to safely capture data in many of the smallest enclosures where the MTAP2® cannot be installed.
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