Is your motor energy saving estimation based upon motor nameplate efficiency?
If yes, then the estimation based decisions may prove wrong as the running efficiency needs to be considered for such estimations.
It is estimated that more than 80% of the industrial power consumption is consumed by induction motors
- Rated full load efficiency which depends upon the construction & efficiency class
- Operating efficiency which depends upon loading % & loading patterns
- No. of times of rewinding
- Starter type ( DOL /SD/ VFD / soft starter etc)
- Input supply voltage
- Measurement of running efficiency of each motor
- Study of loading cycle for each motor
- Study of control & starting mechanism for each motor
- Submission of report for each motor consisting of :
- a.Running efficiency
- b.Recommended energy saving solution
- c.Investment & Payback period
Ideally, running efficiency of the motor can only be found out after measurement of mechanical load & input electrical power. Unless, one measures correct running efficiency, one can not correctly estimate energy savings by proposed energy saving solutions. Typically, during general energy audits, recommendations are made based upon name plate efficiency as finding running efficiency is a time consuming task. So, there is a need of 'Motor Audit' which focuses only on motors.