Design of a Single-phase Asynchronous Motor under the Wide Voltage and Realization of MATLAB Program

Abstract

In a single-phase power supply system with the relatively large range of voltage fluctuation, an ordinary single-phase asynchronous motor is difficult to run normally. In order to solve this question, a new type of single-phase asynchronous motor running in the wide voltage range is proposed. In this paper, the design of a single-phase asynchronous motor with the wide voltage operation is analyzed theoretically. MATLAB design program for general wide voltage single-phase asynchronous motor is given, and then the practical application of the program is verified by examples. The single-phase capacitor starting and running asynchronous motor needs to run in the single-phase power supply, with the advantages of simple structure, low cost and low noise, and has good starting and running performance, high power factor and efficiency characteristics. It's widely used in industrial and agricultural production and people's daily life. In the remote areas, far from the power supply center, the power supply quality is poor and the voltage fluctuation is very big, so that the motor cannot run normally and is even burned in low voltage. Therefore, the asynchronous motor which can run in the wide voltage range is not only a great development potential, but also has considerable economic and social benefits. The voltage regulator and other stable voltage devices are proposed in the paper (1), but it is uneasy to be popularized and difficult to guarantee the motor run normally, because the voltage regulator also has a voltage operating range, and its capacity is three times than that of the motor power, and the price is very expensive. A voltage adjustable single-phase motor with some taps in the main coil is given in the paper (2), which can be controlled by mechanical type shift switches. The motor can run normally in different power supply area, but the structure of the motor is complex, and it is difficult to be widely used in the application. In this paper, similar to common single-phase motor in the structure, the single-phase capacitor starting and running asynchronous motor has a new winding structure with high efficiency, high power factor and other characteristics, to make it run in the wide voltage better. Combined with the structure of the motor, the design theory is given in the paper. To extend the application of the single phase motor running in the wide voltage, the electromagnetic design program of the motor is written, the design of the motor running in the voltage between 140V and 260V and the power of 750W, is given in the paper to provide support for it.