Tekwell Services electric motor circuit analysis (EMCA) is a comprehensive diagnostic procedure that evaluates the electrical integrity and performance of a motor’s windings and associated components. Our motor circuit evaluation (MCE) test equipment offers the most comprehensive approach to troubleshooting and trending de-energized electric motors on the market today. This analysis is typically performed using specialized instruments, such as a motor analyzer or static tester, and is conducted either in the field (offline or online) or in a repair shop.
Here’s what an electric motor circuit analysis provides:
Winding Condition Assessment
EMCA detects issues related to the stator windings, such as:
- Shorted turns within a coil
- Open windings or disconnected leads
- Phase-to-phase imbalances
- Phase-to-ground faults (insulation breakdown)
This helps predict potential motor failure before it results in unscheduled downtime.
Insulation Resistance and Dielectric Strength
By applying high DC voltage (typically via a megohmmeter), EMCA:
- Evaluates the resistance of insulation between windings and ground.
- Identifies moisture intrusion, contamination, or thermal degradation of insulation.
- Determines if the motor meets insulation class standards.
- Impedance and Inductance Measurements
EMCA measures:
- Impedance balance between phases to identify winding imbalances or rotor eccentricity.
- Inductance to verify winding symmetry and magnetic field integrity.
These values help detect subtle electrical issues, especially in motors operating with variable frequency drives.
Capacitance to Ground Testing
This evaluates the capacitance between windings and ground, offering insight into:
- Insulation thickness and condition
- Potential breakdown paths
- The overall health of the winding system over time
Rotor Health Indications
While EMCA primarily evaluates stator circuits, some test signatures (especially impedance and phase angle shifts) can reveal issues like:
- Rotor bar damage
- Eccentric rotor positioning
- Broken rotor bars in squirrel cage induction motors
Connection and Lead Verification
EMCA confirms that:
- Motor windings are correctly connected in delta or wye configurations.
- Motor leads are not swapped or reversed.
- No loose or high-resistance connections exist within junction boxes or terminal blocks.
Baseline Condition Monitoring
When performed on a healthy motor, EMCA creates a baseline profile. This profile allows:
- Trend analysis over time
- Predictive maintenance based on degradation rates
- Better scheduling of repairs before failure occurs
Is it Time for an Electric Motor Circuit Analysis?
Electric motor circuit analysis provides a non-destructive, data-rich evaluation of a motor’s electrical condition. It enhances predictive maintenance, supports troubleshooting efforts, and improves reliability and uptime by identifying early-stage electrical faults before they become catastrophic.
Take advantage of our EMC process and get your comprehensive electric motor circuit analysis today. Start by calling 1-800-829-7454 or completing our Pump and Electric Motor Repair Form today.