How to Determine if Disassembling and Reassembling a Stepper Motor Affects Its Usability?

To ensure equipment professionalism, safety, and user rights, we explicitly state that any unauthorized disassembly or reassembly of the motor will void the original factory warranty. Stepper motors are precision power units, and non-professional operations may lead to hidden faults, performance degradation, and safety risks. If you still choose to proceed, we are committed to providing professional diagnostics and services to ensure a fundamental resolution and protect your interests.

To determine whether a stepper motor remains fully functional after disassembly and reassembly, perform the following two checks. If both are passed, the motor is considered unaffected by the process.

1. Mechanical Feel Test

Procedure: Rotate the motor shaft by hand without applying power.

Standard: The rotation should feel smooth throughout, with no catching or uneven resistance.

Purpose: To rule out mechanical issues such as bearing damage, improper assembly, or internal rubbing.

2. Electrical Parameter Test

Procedure: Use a multimeter or appropriate instruments for measurement.

Items and Standards:

• Resistance: The resistance of each phase should be normal and balanced.
• Insulation: The insulation resistance between the windings and the motor casing must meet the standard (typically >100 MΩ).
• Inductance: The inductance of each phase should be normal and balanced.
• Withstand Voltage (Hi-Pot): The motor should pass a high-voltage test without breakdown (a more rigorous check).

Purpose: To confirm that the windings, magnetic circuit, and insulation remain undamaged after disassembly and reassembly.

Conclusion: If the motor passes both the "smooth manual rotation" and the "normal and balanced electrical parameters" checks, it is generally safe for continued use.

Updated on: 28/11/2025