A novel method for load testing and efficiency measurement of three-phase induction motors

This paper describes a novel method of fail load testing for temperature rise and efficiency evaluation of three-phase induction motors. A synthetic loading technique is used, without the need to connect a load to the machine's drive shaft. The new method uses a digital signal processor controlled power electronic inverter to continually accelerate and decelerate the induction machine, while using a new real time data acquisition system to accurately determine and record the machine's performance. The method proposed considerably reduces the testing time compared with conventional methods of temperature rise and efficiency measurement and the accuracy of the result is maintained. Simulation using a hypothetical machine is used to confirm the technique for efficiency evaluation.

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