Automatic Estimation of Equivalent Circuit Parameters of Induction Motors for Drives

Abstract

Control strategies for the DC motor drives are quite simpler and have some good features. But AC motor drives are much more efficient and cost-effective for the servo application as compared to their DC counterparts. Many control strategies are available of AC drives too but they are complex as they require number of machine parameters. To obtain these machine parameters one can either refer to the datasheet provided by the manufacturer or some tests could be performed for the same. Test results may not be accurate due to the continuously varying operating conditions and other factors. This may lead to the malfunctioning of drive which is totally undesirable. For getting the performance of the higher grounds with sensor-less vector control of an induction motor, the accuracy of the motor parameters has are predominant in governing the performance of the system in whole. A solution to problems faced in AC drives is the new feature called self-commissioning. In this paper light is thrown on the self-commissioning of the induction motor for drives which a novel feature for the AC drives. Self-commissioning totally eliminates the need of performing the traditional tedious tests for obtaining machine parameters. This drastically reduces the costs of test equipments, also self-commissioning support the advantage of the auto-tuning of the electric drive with the motor parameter varying in continuously altering operating conditions.