The coil neck is the transition zone between the enameled wire winding and the lead wires; during high-speed motor rotation, it continuously experiences centrifugal forces and vibration, while start‑stop operations subject it to thermal cycling, making it highly susceptible to failure. Lead wire breakage, winding loosening, insulation damage, and abnormal noises caused by short circuits. The neck of the rotor is a weak point; reinforcing this area directly determines the motor’s reliability. Many motors experience early failure, and the root cause often lies in the coil‑neck region. Therefore, robust reinforcement and protection of the coil neck are critical steps for enhancing overall rotor reliability and extending the motor’s service life.

Therefore, the adhesive plays a crucial role in the motor coil neck. ( Take Hinnel HN6020H-2 as an example. ) It is mainly reflected in the following aspects:

✅High thixotropy and anti-sagging: After application, it resists flow and sagging, adheres to the intricate crevices of the coil neck, and maintains stable shaping without the need for additional tooling support, making it well-suited for automated dispensing operations.

✅High-intensity centrifugal force resistance: After curing The shear strength can reach 18–32 MPa. It securely locks the connection between the coil and the iron core, resisting the strong centrifugal forces generated during medium- to high-speed motor operation and preventing the coil from loosening or falling off. 
 

✅High toughness, impact resistance, and fatigue resistance: Part High-toughness products exhibit an elongation at break exceeding 8%. It can absorb vibrations and impacts, counteract the stress caused by thermal cycling, and remain crack-free during long-term operation.

✅Excellent insulation performance: After colloidal curing, it exhibits high dielectric strength, forming a reliable insulating barrier at the coil neck to prevent electrical breakdown between adjacent windings and the core, thereby eliminating the risk of short circuits.

✅ Wide temperature resistance range: Mainstream The product’s temperature resistance range spans from –40°C to 180°C, with select high-end models capable of withstanding temperatures up to 200°C. , it remains crack‑free at low temperatures and does not soften at high temperatures, making it a perfect match.   Class F, Class H Operational requirements for insulated motors.

✅Waterproof and corrosion-resistant: After curing, it can enhance the overall performance of the motor. Waterproof, moisture-resistant, oil‑resistant, and corrosion‑resistant, effectively preventing damage from humidity, dust, and chemical agents. The coil’s neck section helps extend the motor’s service life.

✅Strong process compatibility: Single-component epoxy system Compatible with medium-temperature rapid curing at 120°C to 150°C. It does not generate localized high temperatures that could demagnetize the permanent magnets, as welding does, and it is better suited than conventional riveting or binding methods for the compact design of small, high‑power‑density motors.

Precautions for using adhesive on coil necks:

1. Clean the coil surface: Before applying the adhesive, be sure to clean the coil surface thoroughly to remove any oil or contaminants, thereby enhancing the adhesive’s bond strength.

2. Even coating: Use an appropriate tool to apply the adhesive evenly onto the coil surface, ensuring uniform thickness and preventing variations in coating thickness. 
 

3. Control curing conditions: Based on the curing requirements of the adhesive, carefully control the curing temperature and duration to ensure complete cure and attainment of the desired performance.

There are several types of adhesives commonly used for encapsulating the rotor winding necks; among them, Neck-specific adhesive, exemplified by HN6020H-2 It is a flagship product custom-designed for this specific operating condition, with numerous proven applications in medium- and high-speed motors as well as dry-type motor systems. It can effectively reinforce the motor’s soldered leads, preventing loosening or detachment at the coil‑neck encapsulation and ensuring normal operation while extending the motor’s service life.

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