Abstract：To solve the problems of many transmission links, complex structure and low efficiency, a project of direct drive pumping unit by liner machine was proposed. The method of direct balance and the tubular flux switching permanent magnet motor were adopted in the system. The overall structure of the pumping unit was designed, and the working principle of the tubular flux switching motor was analyzed. The main dimension of the motor was given. Based on finite element method, the electromagnetic performance parameters of magnetic field distribution, air gap flux density, permanent magnet flux linkage, noload back EMF, inductance and thrust were investigated. The detent force of tubular flux switching motor was optimized by adding auxiliary teeth. The results show that the motor has the characteristics of more sinusoidal back EMF, and the harmonic component accounts for only 3% of fundamental component. The tubular flux switching permanent magnet motor is suitable especially for the applications in pumping system.
2016, Vol. 37 
