精品文档---下载后可任意编辑精品文档---下载后可任意编辑［摘 要］介绍了以 C8051 单片机为核心的的沟通异步电动机软启动器。软启动器包括主电路和控制电路两部分。控制电路利用晶闸管的导通角计算电机的功率因数；电机启动方式采纳电压斜坡软启动；单片机控制晶闸管触发脉冲，通过对电机起动过程中的品闸管触发脉冲的控制，实现电机的平滑起动，减少了电机对电网的冲击，起到了节能作用。该系统能够设置电机的起动参数，自动诊断故障，控制系统智能化。［关键词］软启动器；异步电动机；单片机；晶闸管Design of Sotf-starter in Three-phase Asynchronous MotorElectrical Engineering and Automation Specialty Major WANGZeng-qiangAbstract: This paper introduesa sotf-starter control system which is based on 8051 single chip in three-phase AC asynchronous motor.The system includes main circuit and control circuit.Using SCRconductionangleto comprute the power of the motor is a distinguishing feature of control circuit. the solpe voltage starting of starting mode is used to start the motor,the crystal thyratron trigger pluse is controled by single chip.By controling the thyristor trigger pluse,the motor can start stably.It proves that the soft-starter can reduce the current impact of motor starting and having energy-saving effect.The advantages of the system is setting the starting parameter of the motor,fault diagnosing display,the nitelligence control system.Key words:Sotf-starter;asynchronous motor;single chip;thyristor目 录1 前言 11.1 三相异步电动机软启动器的国内外讨论现状 1 1.2 本文主要内容 1 2 软启动器原理 1 2.1 软启动器及其工作原理 1 2.2 软启动器启动方式 1 2.4 软启动器的四种停机方式 2 2.5 软启动器的接线方案 2 3 软启动器硬件电路设计 2 3.1 软启动器硬件电路总体框图 2 3.2 软启动器主电路的设计 2 3.2.1 软启动器主电路的设计 2 3.2.2 电路元件参数的选择 3 3.3 软启动器控制电路的设计 3 3.3.1 软启动器电机线电压检测电路设计 3 3.3.2 软启动器晶闸管触发驱动...
