The Challenge
A customer experienced an unexpected breakdown of a Siemens industrial motor. The motor had completely stopped operating, resulting in production downtime and requiring immediate investigation.
Upon inspection by Winston Engineering’s technical team, the motor winding was found to be burnt on one phase of the delta-connected winding. Further analysis confirmed that the motor had been operating under a single-phasing condition, where only two phases of power were supplied to the motor. This caused excessive current in the remaining windings, leading to overheating and eventual motor failure.
Root Cause Analysis
Our inspection identified several contributing factors:
- One set of the delta-connected motor winding was burnt.
- The motor was receiving only two phases of electrical supply.
- The loss of one phase was likely caused by a faulty cable, contactor, MCB, or overload protection device.
- The existing electrical control panel was old and no longer provided reliable protection for the motor.
Without proper protection, the motor continued running under abnormal electrical conditions until the winding failed.
Our Solution
After completing the investigation, Winston Engineering recommended the following corrective actions:
- Rewind the damaged motor winding.
- Perform a complete inspection of the electrical control panel.
- Check the incoming power supply, contactors, overload relays, wiring, and protection devices.
- Upgrade the ageing electrical panel to improve reliability and prevent future failures.
By addressing both the motor damage and the root electrical issue, the customer can significantly reduce the risk of repeat failures and unplanned downtime.
How Winston Engineering Can Help
Industrial motor failures are often symptoms of a larger electrical or mechanical problem. Simply replacing the motor without identifying the root cause may result in the same failure occurring again.
At Winston Engineering, we provide comprehensive motor support, including:
- Industrial motor troubleshooting and failure analysis
- Electrical system and control panel inspections
- Motor rewinding and repair services
- Replacement motors from trusted global brands
- Preventive maintenance to improve equipment reliability
- Technical recommendations to minimise downtime and maintenance costs
Our experienced engineers investigate the complete system—not just the motor—to ensure every solution addresses the actual cause of the problem.
Need Help with Your Industrial Motor?
If your motor is overheating, tripping, vibrating, or has unexpectedly failed, Winston Engineering is ready to help. Contact our technical team for professional troubleshooting, repair recommendations, and reliable motor solutions that keep your operations running efficiently.
Frequently Asked Questions (FAQs)
1. What causes a motor winding to burn?
A motor winding can burn due to electrical faults such as overload, short circuits, or single-phasing. In this case study, the motor winding failed because only two phases of power were supplied, causing one set of the winding to overheat and burn.
2. What is single-phasing in a three-phase motor?
Single-phasing occurs when one of the three power phases is lost while the motor continues operating. This condition causes excessive current in the remaining windings, resulting in overheating, reduced performance, and potential motor failure.
3. How can I prevent motor winding failure?
Regular inspection of the electrical control panel, contactors, overload relays, circuit breakers (MCBs), and power supply can help prevent single-phasing and other electrical faults. Replacing ageing electrical components before failure also improves motor reliability.
4. Can a burnt motor be repaired?
Yes. If the motor core and other major components remain in good condition, the burnt winding can often be professionally rewound, tested, and returned to service after the root cause of the failure has been corrected. The case study recommends rewinding the motor and checking the electrical system.
5. How can Winston Engineering help with motor failures?
Winston Engineering provides motor failure diagnosis, root cause analysis, motor rewinding, electrical system inspection, replacement motors, and preventive maintenance services. Our experienced team identifies the actual cause of failure and recommends the most reliable solution to minimise downtime and improve equipment performance.
Author Bio
Chun Wei
Chun Wei is a marketing professional with a Bachelor of Arts in Marketing from UCSI University. With hands-on experience spanning social media management, data analysis, and sales marketing, he brings a fresh and analytical perspective to content and digital strategy. His background across various industries has sharpened his ability to translate insights into effective marketing initiatives. At Winston Engineering, Chun Wei contributes to the team's mission of putting solutions in action through clear, engaging, and informative content.
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