Securing the rotor core stack onto the motor shaft is arguably the most critical assembly step in manufacturing or rebuilding an electric motor or generator. This joint is subjected to massive centrifugal forces at high RPMs, intense torsional shock during start-up, continuous vibration, and significant heat generated by electrical losses. Maintaining an absolute zero-clearance, non-shifting fit is non-negotiable for safety, efficiency, and preventing failure due to imbalance or core slip.
INCURE WeldLock™ 365 Retaining Compound
For securing high-speed or high-load rotors—where permanent retention, superior shear strength, and resistance to heat are paramount—the WeldLock™ 365 provides the highest structural integrity. Its superior strength ensures the rotor cannot slip axially or rotationally, which is vital for maintaining precise air gap and preventing catastrophic failure due to imbalance at high RPMs.
| Feature & Benefit | Technical Insight for Rotor Assemblies | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to centrifugal forcesand torsional slip. | Zero Slippage: Guarantees absolute, 100%torque transmission and prevents fretting corrosion. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C (392∘F), essential for components exposed to electrical and friction heat. | End the Heat Threat: Ensures the bond remains rigid and strong under maximum thermal load. |
| Fills Close Clearance Gaps | Ideal for components with an interference or true close-tolerance slip fit (less than 0.05 mm diametral clearance) typical of electric motor manufacturing. | Maximizes Concentricity: Converts the fit into an integrated component, optimizing dynamic balance and reducing destructive vibration. |
| High Dielectric Strength | The anaerobic polymer provides high electrical insulating properties, which is beneficial in this electro-mechanical joint. | Reliability Assured: The bond remains permanently intact despite electrical and thermal stress. |
Application Steps: Locking Rotor Components for Maximum Reliability
Preparation (Critical): Thoroughly clean both mating surfaces (e.g., the rotor core bore and the shaft OD). Remove all oil, grease, paint, and residue. Use a degreasing solvent (like acetone or industrial cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the shaft surface or the inside circumference of the rotor core bore. Ensure the compound completely covers the mating area.
Assembly: Press the rotor component onto the shaft using the manufacturer’s specified tools. Ensure the component is fully seated. Wipe away any excess compound immediately.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before continuing final assembly (installing bearings, etc.) or operating the motor/generator.
Stop risking vibration and ensure your electric motor rotors are absolutely locked in place for maximum efficiency and lifespan.