Electrical Motor Efficiency Study

Overview
Electric motors are among the largest consumers of electricity in industrial facilities, making their performance and efficiency critical to overall energy management. Evaluating motor operating conditions helps identify energy losses, improper loading, and opportunities to improve system performance and reliability. At Limbaja Energy, we provide Motor Audit Services in Gujarat for industries across Gujarat and India. Our Motor Energy Audit Services include motor efficiency assessments, electric motor performance analysis, and efficiency testing to identify energy-saving opportunities, optimize motor operation, reduce power consumption, and improve the reliability and performance of industrial motor systems.
Losses considered:
The stray losses are difficult to measure with any accuracy. IEEE Standard 112 gives a complicated method. Which is rarely used on shop floor. IS & IEC standards take fixed value as 0.5% of output. It must be remarked that actual value of stray losses is likely to be more. IEEE – 112 specifies values from 0.9 to 1.8%.
Case Study
Overview
- Application: All Induction motor more than 50HP.
- Type of Audit: Motor Efficiency Study.
Motor Efficiency Calculation
| SN | Descriptions | Unit | Value |
|---|---|---|---|
| 1 | No of poles | - | 6 |
| 2 | Winding connection | - | DELTA |
| 3 | Type | - | TEFC |
| 4 | Output | kW | 180 |
| 5 | Voltage | Volts | 415 |
| 6 | Full load current, Ifl | Amp | 311 |
| 7 | Phase current at Full load, Ifl-ph | Amp | 179.6 |
| 8 | Speed | rpm | 990 |
| 9 | Frequency | Hz | 50 |
| 10 | Full load slip | p.u. | 0.010 |
| 11 | Efficiency | % | 90 |
| 12 | Insulation | - | Class F |
| 13 | Full load winding temperature | 0C | 85 |
| -- | No load test | -- | -- |
| 14 | Line voltage, U | Volts | 415.67 |
| 15 | Line Current, Inl | Amp | 118.7 |
| 16 | Phase current, Inl-ph | Amp | 68.5 |
| 17 | No load power input, Pi-nl | Watts | 9183 |
| 18 | Stator phase resistance at cold condition | Ohms | 0.4333 |
| 19 | Stator phase resistance after no load test | Ohms | 0.4333 |
| 20 | Ambient Temperature, Ta | 0C | 30 |
| 21 | Frequency, f | Hz | 50 |
| 22 | Winding resistance at full load Rph-fl | Ohms | 0.5233 |
| -- | Calculation of losses | -- | -- |
| 23 | No load power input, Pi-nl | Watts | 9183.33 |
| 24 | No load stator copper loss at T1 Temp. | Watts | 6102.1 |
| 25 | Iron, friction and windage loss | Watts | 3081.23 |
| 26 | Stator full load copper loss | Watts | 50611.24 |
| 27 | Synchronous speed | - | 1000.0 |
| 28 | Full load slip | - | 0.01 |
| 29 | Rotor Input power | kW | 181.82 |
| 30 | Rotor ohomic loss | kW | 1.8 |
| 31 | Stray loss 1.5% | kW | 2.7 |
| 32 | Total loss | kW | 58.21 |
| 33 | Motor full load input power | kW | 238.2 |
| 34 | Efficiency | % | 75.563 |
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