Factors that influence motor efficiency include:
- Age - New motors are more efficient.
- Capacity - As with most equipment, motor efficiency increases with the rated capacity.
- Speed - Higher speed motors are usually more efficient.
- Type - For example, squirrel cage motors are normally more efficient than slip-ring motors.
- Temperature - Totally-enclosed fan-cooled (TEFC) motors are more efficient than screen-protected drip-proof (SPDP) motors.
- Rewinding - Rewinding of motors can result in reduced efficiency.
- Load - it is useful to determine both the load and efficiency when assessing a motor’s performance.
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