The fit between the rotor and the shaft in an electric motor is subject to intense torsional cyclic load (especially in variable speed or servo applications), high-frequency vibration, and continuous thermal stress from the motor winding heat. Any relative movement (slippage) between the rotor and the shaft will severely compromise motor efficiency, cause fretting corrosion, and ultimately lead to catastrophic failure. This demands an absolute, High Strength, Permanent structural lock.
The optimal solution is a high-strength retaining compound engineered for maximum torque transfer and high thermal resistance.
INCURE WeldLock™ 347 Retaining Compound (Green)
The INCURE WeldLock™ 347 Retaining Compound is the definitive choice for securing electric motor rotors to shafts. It is a high-strength solution specifically designed to withstand the extreme dynamic loads and superior thermal stability required in permanent, high-performance electric motors.
| Key Feature | Performance for Electric Motor Rotor/Shaft Fit |
| High Strength, Fast Curing | Creates a monolithic, zero-backlash joint that resists the extreme torsional load and cyclic shock, ensuring 100% torque transmission and maintaining rotor balance. |
| Temperature Resistance (175∘C) | Maintains full structural integrity under the sustained, elevated temperatures generated by electric motor windings and core losses, crucial for long-term reliability. |
| Ideal Gap Fill (Up to 0.15mm) | Perfectly secures standard press-fit rotor assemblies, eliminating the microscopic clearances that cause fretting and electrical/mechanical efficiency loss. |
| Core Application | Specifically suited for securing rotors and shafts in motors, matching the exact demands of high-performance electric drive systems. |
Application Steps: Installing Electric Motor Rotors to Shafts
For maximum torque transfer and reliable, permanent retention of the rotor, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean both the shaft surface and the rotor bore. Surfaces must be absolutely free of all contaminants, especially oil, grease, or corrosion inhibitors. Use an industrial cleaner or solvent (e.g., acetone) and wipe dry.
- Activate (If Needed): If using passive metals (like stainless steel) or if the ambient temperature is below 15∘C(59∘F), apply a chemical activator to the bond surfaces and allow it to flash off completely.
2. Product Application
- Apply: Apply a continuous, thin bead of WeldLock™ 347 around the full circumference of either the shaft or the internal bore of the rotor hub.
- Ensure Coverage: Ensure the adhesive completely wets the entire mating surface as the components slide together to fill all microscopic gaps.
3. Assembly and Curing
- Assemble: Immediately slide or press the rotor onto the shaft. Ensure the rotor is seated in its final axial position before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after assembly.
- Cure: Allow the assembly to fixture before handling (typically 5 minutes). Allow a full 24 hours for the compound to reach maximum strength before placing the motor into service or subjecting it to testing loads.