Energy efficient permanent magnet Ind-Syn motor

Abstract

In modern industrialized country about 65% of electrical energy is consumed by AC motors. With the worldwide trend to energy conservation, there is a need to increase the efficiency of AC motors, small and large. To cope up with this, the improvement of materials and optimization of design strategies have been tried out. The permanent magnet Ind-Syn motor (PMISM) have been developed in the recent years and gained popularity in various industrial applications. Owing to rare-earth permanent magnets, these motors have higher efficiency and higher power-factor. The use of PMISM has become a more attractive option than induction motors. It is quite possible that this permanent magnet induction-synchronous motor will become predominant in the near future. The PMISM has a conventional induction motor stator and cage rotor with permanent magnets buried inside the rotor. The main advantages of PMISM are their simple construction, minimum maintenance, no commutator or slip rings. Hence, this work aims at the design and development of permanent magnet Ind-Syn motor. The motor starts as an induction motor, gets synchronized and runs at synchronous speed. Attractive features of the proposed model are compactness, energy efficient operation, reduction in active materials used in motor. A prototype has been designed, developed and tested. Results validate the superior performance of this new technology. The above feasible design and simulation of motor has been done through, the CAD/CAE software, namely AutoCAD 2000 and MOTORPRO. Exercising the energy conservation measures plays an important role in the electricity, particularly in industrial and agricultural sector. In this work a 2.2 kW, 415 V, 4-pole, delta connected 3-phase permanent magnet Ind-Syn motor (PMISM) was designed and developed. The permanent magnets were fitted in the rotor. Various performance tests such as no-load test at variable voltages, variable frequency test and load test were conducted using developed 3-phase permanent magnet Ind-Syn motor (PMISM). The performance of the PMISM was compared with conventional motors. The machine offers great future because of its unique characteristics of self-synchronization and high efficiency, power-factor and small size.