On tanker vessels such as MT. PATRA TANKER 2, the refrigeration and HVAC systems rely heavily on the performance of the semi hermetic electro motor, especially those integrated with refrigeration compressors. These motors operate in a sealed environment and are directly connected to the compressor unit, making their reliability essential for maintaining proper cooling onboard.
Over time, electrical and mechanical stress can damage the motor windings. In such cases, rewinding the semi hermetic electro motor becomes an effective solution to restore functionality and performance.
What Is Rewinding of a Semi Hermetic Electro Motor?
Rewinding is the process of removing damaged electrical windings from a motor stator and replacing them with new copper windings. This process restores the motor’s electrical integrity and operational efficiency.
In semi hermetic motors, rewinding requires specialized handling due to the enclosed design and integration with the compressor system.
Causes of Semi Hermetic Motor Failure
Common causes of failure in semi hermetic electro motors on MT. PATRA TANKER 2 include:
- Overheating due to excessive load
- Unstable or fluctuating voltage supply
- Short circuits in motor windings
- Cooling system failure
- Contamination by refrigerant or oil
- Aging and prolonged operation
These issues can lead to compressor shutdown and disruption of onboard cooling systems.
Rewinding Process of Semi Hermetic Electro Motor
1. Preparation and Dismantling
- Coordination with vessel engineers
- Isolation and removal of motor-compressor unit
- Dismantling of semi hermetic housing
- Documentation of initial condition
2. Initial Inspection
- Visual inspection of winding condition
- Insulation resistance testing
- Continuity testing
- Identification of fault locations
3. Removal of Old Windings
- Removal of damaged windings from stator
- Cleaning stator slots from insulation residue
- Inspection of stator core condition
4. Rewinding Process
- Fabrication of new windings according to specifications
- Installation of new copper coils
- Adjustment of turns and wire size
- Application of insulation materials
5. Impregnation and Drying
- Varnish impregnation to improve insulation strength
- Oven drying process for mechanical and electrical stability
- Cooling prior to reassembly
6. Reassembly
- Reinstallation of stator into housing
- Reassembly of compressor and motor components
- Replacement of gaskets and seals
- Alignment verification
7. Testing and Commissioning
Monitoring current, voltage, and temperature
Insulation resistance testing
No-load test
Load test under operating conditions
Benefits of Rewinding Semi Hermetic Electro Motor
Performing rewinding on MT. PATRA TANKER 2 offers several advantages:
- Restores motor performance to optimal condition
- Cost-effective compared to full motor replacement
- Extends motor service life
- Improves energy efficiency
- Reduces downtime of refrigeration systems
- Ensures reliable vessel operation
Conclusion
Rewinding the semi hermetic electro motor on MT. PATRA TANKER 2 is an effective maintenance solution to repair damaged motor windings and restore system performance. Through proper dismantling, rewinding, reassembly, and testing, the motor can return to reliable operation within the vessel’s cooling system.
This procedure is highly recommended as part of both corrective and preventive maintenance programs to ensure long-term operational reliability and efficiency.
