Analysis And Calculation Of Iron Loss And Additional Losses For Induction Motor With High-efficiency And High-voltage

Energy-saving and environmental protection issues are widespread concerned in various aspects of life. The induction motors with high-efficiency and high-voltage due to an outstanding energy-saving effect have been widely used.Considering the structure characteristics and engineering design requirements, iron loss and additional losses under different operation conditions are discussed deeply by the analysis of magnetic field.Firstly, the 2-D transient mathematical model of the motors with high-efficiency and high-voltage is built on the basis of the impedance of end being considered by circuit. The motor's dynamic performance curves under no-load starting and full-load starting are acquired. At the same time, the distributions of magnetic flux density at different time are gained. On the basis of the analyzing the magnetic types and the distributions of magnetic field, the iron loss calculation method based on the magnetic field is adopted. Then, the iron losses of stator and rotor are calculated and the 3-D distributions of iron losses are obtained.Secondly, the cause and calculation of additional losses in motors with high-efficiency and high-voltage are analyzed. On the basis of 2-D transient field calculation results, the additional losses of induction motor with high-efficiency and high-voltage under no-load and full-load are calculated respectively by field-circuit coupling and the difference magnetic flux leakage theory.Finally, the 2-D time-harmonic mathematical model of the motor with high-efficiency and high-voltage is built .After the calculation of iron loss and additional losses, the impacts of structural parameters, including core material, magnetic slot wedge, pitch and slot combination, on iron loss and additional losses are analyzed, then the optimal design model is given to improve motor efficiency according to the results of the analysis.