三相异步电动机软启动装置设计(4)

论文

Three phase asynchronous motor soft start device design

ABSTRACT

The three-phase asynchronous motor because of its simple structure, convenient manufacture, reliable operation, low price and the like, and is widely applied in industry, agriculture, transportation, defense industry and other industries. But it also has obvious shortcomings, the starting torque is small, large starting current. This situation on the motor itself and the surrounding network has very adverse effect. In order to reduce the asynchronous motor starting process of the impact of power grid, the elimination of the traditional step-down start equipment with level control for asynchronous motor to improve impact, induction motor, this paper based on single-chip microcomputer controlled thyristor voltage soft starter were discussed.

This article first elaborated the soft starter thyristor voltage regulating circuit (i.e., working principle, main circuit) is mainly based on thyristor three-phase asynchronous motor soft starter the design of main circuit and trigger circuit design. The electric motor soft starter in model design, but mainly the hardware circuit design of soft starter.

In this paper, the design of the soft starter of convenient and simple operation, can make the motor start smoothly. To achieve the improvement of three-phase asynchronous motor starting performance requirements. In order to meet the requirements of starting torque of asynchronous motor starting current is reduced under the premise, so that the motor can stably start.

Keywords：Asynchronous motor; Thyristor; Soft starting