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 What are the Methods of Testing an Electric Motor

What are the Methods of Testing an Electric Motor

Sunday, August 14, 2022

IEEE Std 1415-2006 IEEE Guide for Induction Machinery Maintenance Testing and Failure Analysis

This a complete list of Motor Tests as listed under the IEEE std, with associated experience from 3Phi Reliability

Bearing temperature      Simple trending, Better Methods for On Condition Lubrication

Recommended

Capacitance             Ok for contamination of Windings  

Core Loss Test         Essential in Rewind Process, Conducted in Repair Shop Recommended

Current Trending      OK if Process is stable

Current signature     Good tool but Drive Emissions can crowd data

Current starting        In Rush Current amplifies Winding Conditions,     Meter Must have Low Pass filter and variable hz capability on drives Recommended 

DC high potential .Limited Experience

Dielectric Similar to Polarization Index, Good on Open frame motors near Ammonia

Recommended

Dissipation factor         Cable defects can be detected. Motor Insulation factor Cable defects can be detected. Motor Insulation defects

Grease analysis       This is essential as part of a lubrication program. Especially on Drives

Recommended

Growler Repair             Shop Rotor Analysis. Better in field rotor test(Rotor Signature)

Insulation resistance     Mandatory Safety Test. Late Stage failure detection (Phase to Phase is  better)

Recommended

Oil Analysis                     Very Effective early defect detection

Recommended

Partial discharge            Essential for MV & HV Motors

Recommended

Phase angle            Effective detection of early Winding defects, Trend-able

Phase balance(Inductance and Impedance)

Recommended

Polarization index         Effective on Open frame motors where fugitive emissions (eg  Ammonia)

Recommended

Shaft grounding currents            More effective than Shaft Voltage

Recommended

Shaft  Voltage                     Good Indicator of Drive Emissions

Speed                                Ok for measuring Slip frequency if Load constant

Surge test                           Effective Winding Test, Not easily Portable

Torque analysis                 Good Analysis, Takes a lot of setup not really        potable

Ultrasound                        Great for On Condition Lubrication programs

Recommended

Variable frequency           Effective early detection of Winding Defects, Portable

Recommended

Vibration Analysis            Effective in many Motor defects both Mech                                              Elect, limited Stator  defect detection

Recommended

Voltage balance              Essential Test, Highly damaging to Stator health

Recommended

Voltage distortion          Power Quality should be checked with Power Analyzer, can affect Motor Efficiency

Recommended

Voltage drop                  As above On Motor Start

Recommended

Voltage level                 As above

Recommended

Voltage spikes             As above

Recommended

Winding resistance     Effective means of findings Circuit defects, and Energy Opportunities

Recommended

Winding Temperature    Good trending indicator of Operating conditions

Recommended

Not Listed in IEEE Std

EMF Drive Emissions       Essential test to Motor Stator Health

Recommended

Transfer Impedance        Test to ensure grounding of Drive & Motor

Recommended

Mark Gurney Motor Analyst

http://www.3Phi-Reliability.com/

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