Motor Rewinding Economics Analyzer
Compare a motor rewinding decision with buying a replacement motor. This tool separates the immediate repair price from the longer-term electricity and service-life consequences of each option.
Compare rewind and replacement
Economic comparison
| Option | Initial cost | Input power | Annual energy | Annual energy cost | Expected life |
|---|
How the comparison works
The tool compares two specific pathways: rewind the existing motor, or install a replacement motor. The energy model assumes the same mechanical output is maintained. Electrical input power is therefore calculated from mechanical load divided by motor efficiency.
Input power = Mechanical load ÷ Efficiency
Annual energy = Input power × Operating hours
The annual maintenance saving is treated as an additional operating benefit of the replacement. The replacement's simple payback is based on its extra upfront cost divided by annual energy and maintenance savings.
Why remaining life matters
A rewind that costs considerably less than a new motor may still be the better short-term option when the existing machine has only a limited remaining service window. Conversely, the longer expected life of a replacement can justify a higher upfront purchase when the motor operates many hours each year.
Important assumptions
- Efficiency values are user-entered and should represent comparable operating conditions.
- Mechanical output is assumed to remain the same for both options.
- Maintenance saving is an estimate supplied by the user, not an industry default.
- The result does not include downtime, installation labor, taxes, financing, salvage value or process losses unless you incorporate them into the entered costs.
When this result should not be used alone
Motor condition, winding quality, core condition, bearing condition, insulation testing, nameplate data and the repairer's workmanship can materially affect the outcome. A financial comparison should be combined with technical inspection before a final maintenance decision.
FAQs
Does rewinding always reduce efficiency?
No universal reduction should be assumed. The result depends on the actual efficiency entered for the rewound motor and the replacement.
Why does the tool use mechanical load?
It provides a common output basis so that differences in efficiency can be translated into electrical input and annual energy cost.
What does life-adjusted advantage mean?
It compares modeled operating benefits and upfront costs over the shorter of the two entered service-life periods.
Does this decide whether a motor can legally be repaired?
No. It is an economic planning tool and does not determine safety, repairability, conformity or compliance.