This paper is based on the characteristics and design methods of the star delta mixed winding in order to solve the problem of low load loading by using high power motor in oil field

and some design and improvement of the winding and core in a traditional three phase induction motor are carried out. The finite element method is used to analyze the magnetic field and the starting performance of the motor before and after the improvement. The results show that the improved motor has better starting performance and lower harmonic. It verifies the correctness of the improved method. The load characteristics of the modified motor are calculated by the experiment. The result shows the motor still has high efficiency when driving the low load and meets the design requirements of the high starting torque energy saving motor. In order to verify the optimization of the design cost savings in the outstanding advantages

the improved motor and the large base

highpower motor in the manufacturing cost comparison.