Industrial motor coil rewinding and manufacturing

basic information

■Features of Our Motor Coil Rewinding (Rewinding) Maintenance 1. There are no restrictions on the type of motor or its output capacity. We accommodate various types of motors, including high-voltage motors and DC motors. 2. With over 70 years of experience since our founding, we have honed our skills in motor coil rewinding, insulation reinforcement through impregnation, and thermal spraying, ensuring high quality. We not only rewind motor coils but also extend their lifespan. 3. We propose appropriate measures for extending the life of the motor based on the specific condition of each customer's motor, reducing costs compared to purchasing a new motor. 4. We will consider expedited service based on the customer's situation. Please consult us first. ■Support for Old Motors / Imported Models <Motors Eligible for Coil Rewinding (Rewinding) Maintenance> - Low-voltage squirrel-cage motors - Wound rotor motors (both stator and rotor coils are acceptable) - High-voltage motors - DC motors (both stator and rotor are acceptable) - Brake coils - Magnet coils - Various coils for generators *The above are examples. We can rewind a variety of motor coils, so please feel free to consult us.

Price information

We will provide a free estimate for the rewinding (recoiling) of motor coils. Feel free to contact us even if it's just for an estimate inquiry.

Delivery Time

※Depending on the motor specifications (please feel free to contact us).

Applications/Examples of results

- Rewinding of high-voltage motor stator coils (340kW) - Rewinding of DC motor armature coils (75kW) - Rewinding of winding-type high-voltage motor coils (75kW 8P) - Rewinding of rotor coils for generators for ships (400kVA) - Rewinding of underwater pump motor coils (37kW) - Rewinding of excitation coils for generators - Rewinding and repair of crane brake coils, etc. *The above are just examples.

Detailed information

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  High Voltage Motor Stator Coil Rewinding ● Condition Before Maintenance The motor has been in use for many years, and while the coils are not burnt out, signs of aging deterioration have been observed. The customer requested, "We plan to update the equipment in a few years, but we want to operate without issues until then," so we addressed this with coil rewinding maintenance. ● Results After Maintenance For high voltage motor coils, it is common to wind the coils using a wooden mold and then finalize the shaping with a pull-out machine or similar equipment. This is not limited to high voltage motors; during the coil insertion process, careful work is required to avoid damaging insulating materials such as insulation tape. After conducting pressure tests and confirming there are no issues, assembly and finishing are performed, and finally, a no-load test is conducted to complete the maintenance. One Point Advice While round wire is often used for low voltage motor coils, flat wire is generally used for high voltage motors. In the case of flat copper wire, due to major domestic manufacturers withdrawing from the business or relocating production overseas, the material delivery times have become very lengthy in recent years. However, our company has secured procurement routes for coil materials.

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  Rewinding of the Armature Coil of a DC Motor ● Condition Before Maintenance In this case, the armature coil was burned out, and it was necessary to rewind the armature (the rotor of the DC motor). Upon disassembly and inspection, it was confirmed visually that the coil had turned black overall, indicating a burned condition. ● Maintenance Result The armature coil was removed, and a newly manufactured (rewound) armature coil was installed. Various insulating materials were updated, and insulation treatment (such as varnish impregnation) was performed, completing the rewinding. ● One Point Advice In the maintenance of DC motors, there are cases where rewinding the coil is not necessary even when the insulation is zero. Specifically, when the main pole (or auxiliary pole) coil is mounted on the stator, it may show zero insulation, but upon removing the coil and measuring, no issues with insulation or coil resistance are found. In such cases, it is often due to the deterioration of the insulating material between the stator (iron core) and the coil that results in zero insulation. In this case, regeneration is achieved through the new manufacturing or replacement of the insulating material and overhaul.

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  We received a consultation from a customer regarding a burned-out brake coil. We picked it up from the site and repaired it at our factory. The item we are introducing this time is the rewinding repair of the electromagnetic brake coil used in a 10-ton crane at a logistics center. ● Condition before maintenance (Before) As reported by the customer, the brake coil was completely burned out. ● Maintenance results (After) During the repair process, we disassembled the coil and checked the number of turns. Once the coil was rewound, we completed the process with varnish impregnation, compound treatment, varnish finishing, and various insulation treatments. ● One-point advice When brake failure is confirmed, a burned-out brake coil is suspected, so please feel free to contact us. We also accept repairs, manufacturing, and prototyping for coils other than those for motors, so do not hesitate to reach out.