Influence Of Alloy Element Content On Performance In Induction Motor With Compound Cage Rotor

A kind of induction motor with compound cage rotor (IMCCR) is studied, inwhich rotor bars are composed of upper parts made of alloy (conductor for electricand magnetic) and lower parts made of cast aluminum. Because it has a good startingperformance and operation performance, so in many cases has broad applicationprospect. It has practical significance for engineering to research the influence ofalloy element content on performance in induction motor with compound cage rotor.New type Fe-Cu alloy is used in the bar of induction motor with compound cagerotor (IMCCR). In this paper, the preparation of three kinds of Fe-Cu alloy isintroduced. The influence of its microstructures, hardness and impact toughness isstudied by using metalloscope and scanning electron microscope. Meanwhile,physical propertie such as resistivity, and B-H curve is tested by using magnetictesting device and bridge circuit. The influence of carbon content changing onmicrostructure and performance of Fe-Cu alloy is analysed, which has positivesignificance to the new type material using in motor.According to the defects of rotor alloy material in the preparation process, theinfluence of electromagnetic, bar current and partial loss on induction motor withcompound cage rotor(IMCCR) was developed in this paper. The two dimensionalcalculating models of3kW IMCCR was established by using finite elementmethod(FEM), which included perfect rotor alloy model and defect rotor alloymodels. The variation of magnetic flux density of air gap and cusp of defective alloy,rotor tooth top which contacts with it and other rotor and stator teeth tops around itwere analyzed when the motor operated steadily under rated load. As well, the rotorbars current change and partial loss of this motor were obtained. This study washelpful for applying new material to motor.Last, the2-D temperature field model of generator was established based on theelectromagnetism and heat transfer theories, and the temperature rise to the stator winding resistance value influence was considered.The surface heat transfer of thecabinet was calculated by using a computational method of analytical and numericalcoupling, new ideas were proposed for surface heat transfer of the cabinet ofpermanent magnet synchronous generator.2-D transient temperature field of three-phase short circuit in low speed were analyzed and calculated, the variations withtime of temperature distribution in the different generator internal positions.The material science and electrical professional are combined throughexperiment and test methods in this paper. This paper calculated the copper contentin rotor and analyzed the impact of the carbon content on the performance for themotor. This method can provide a useful reference for new materials used in motor.