Research Of Single-Phase Asynchronous Motor With Optimized Magnetism

Single-phase asynchronous motor is welcomed and used comprehensively in many fields of industry and daily life because of many merits it has, such as it use single-phrase commercial power supply. It has simple structure, cheap cost, reliable performance and convenient maintain, etc. However the shape of magnetic field of air-gap in single-phase asynchronous motor is ellipse. For this reason, the performance of single-phase asynchronous motor is inferior to three-phrase asynchronous motor. This paper puts forward a new kind of structure of single - phase asynchronous motor called single-phase asynchronous motor with optimized magnetism which can improve the performance of the motor. Based on comparing the performance between the model machine and capacitance startup single-phase asynchronous motor (or resistance startup single-phase asynchronous motor), I do research on the performance and principium of capacitance startup single-phase asynchronous motor.First, concisely expatiating the built-in problem of single-phaseasynchronous motor and ways to improve the performance of single-phase asynchronous motor. In the foundation of above expatiating I deduce the torque and other performance of motor using academic deducing method. The work of summarizing the analysis method of single - phase asynchronous motor lay a good foundation of academic research of single-phase asynchronous motor with optimized magnetism.Secondly, in regard to the characteristics of single-phase asynchronous motor with optimized magnetism, the paper brings forward some analytical methods of the magnetic field of air-gap in the motor. The above conclusions prove that the structure of single-phase asynchronous motor with optimized magnetism can reduce the degree of ellipse of the magnetic field of air-gap. Furthermore, the shape of magnetic field of air-gap can become round under some certain conditions. Through experiments the paper compares the magnetic field between helper single-phase asynchronous motor and capacitance startup single - phase asynchronous motor.Thirdly, in regard to particular structure of single-phase asynchronous motor, the paper puts forward the mathematical model and equivalent circuit of the motor and analyzes the motor's torque in two different aspects between the model of motor parameters and physical model.Afterwards, this paper compares the single-phase asynchronous...