UAD155A0111 同步电动机转子绕组提供直流励磁电流

Description

UAD155A0111 同步电动机转子绕组提供直流励磁电流

励磁控制器是用来控制励磁系统的电子设备，UAD155A0111可以调节励磁电源的输出电压和电流，从而实现对磁场的控制。此外，励磁控制器还可以监测励磁系统的工作状态，如电流、电压、温度等参数，并进行保护和故障诊断。

励磁控制器的工作原理主要基于励磁装置主回路和控制部分的工作。励磁装置主回路部分主要完成整流和灭磁两大功能，系统采用三相全控桥可控硅整流电路，向同步电动机转子绕组提供直流励磁电流。灭磁回路由可控硅和二极管反并联组成，实际上组成一个大功率电子开关，完成同步电动机在异步起动过程中串入起动电阻，起动结束后自动切除，保证同步电动机在异步起动期间，转子励磁绕组既不开路也不短路，从而避免励磁绕组承受过电压和过电流。

励磁装置控制部分通过测量转子感应电压频率的变化来控制励磁电流。同步电动机起动时，转子感应电压的频率随着转速的上升逐渐下降。UAD155A0111一旦电动机起动，单片机就立即检测转子感应半个周波的时间，从20ms开始，数码管记“9”，中间每增加20ms，数码减1，到200ms时数码管显示“0”。同时，改变控制信号的大小可以改变中断申请的时刻，达到控制触发角的目的，从而控制励磁电流的大小。

此外，励磁控制器采用微处理器作为控制核心，通过对各类电量的采集转换和软件运算，输出各种状态信号和功率单元的控制信号，将交流励磁电源变为可控直流输出控制，实现发电机励磁的控制。

UAD155A0111 同步电动机转子绕组提供直流励磁电流

Excitation controller is used to control the excitation system of electronic equipment, UAD155A0111 can adjust the output voltage and current of the excitation power supply, so as to achieve the control of the magnetic field. In addition, the excitation controller can also monitor the working state of the excitation system, such as current, voltage, temperature and other parameters, and carry out protection and fault diagnosis.

The working principle of the excitation controller is mainly based on the work of the main circuit and control part of the excitation device. The main circuit part of the excitation device mainly completes two functions: rectification and demagnetization. The system adopts three-phase fully controlled bridge thyristor rectifier circuit to provide DC excitation current to the rotor winding of synchronous motor. The deactivation circuit is composed of thyristor and diode anti-parallel, in fact, composed of a high-power electronic switch, complete synchronous motor in the asynchronous starting process into the starting resistance, automatic cutting after the end of the start, to ensure that synchronous motor in the asynchronous starting period, the rotor excitation winding neither open circuit nor short circuit, so as to avoid the excitation winding to withstand overvoltage and overcurrent.

The control part of the excitation device controls the excitation current by measuring the change of the rotor induced voltage frequency. When synchronous motor starts, the frequency of rotor induced voltage decreases gradually with the increase of speed. UAD155A0111 once the motor starts, the MCU immediately detects the rotor induction half cycle time, starting from 20ms, the digital tube is marked “9”, every 20ms in the middle, the number is reduced by 1, to 200ms when the digital tube display “0”. At the same time, changing the size of the control signal can change the time of interrupt application, and achieve the purpose of controlling the trigger Angle, so as to control the size of the excitation current.

In addition, the excitation controller uses the microprocessor as the control core, and outputs various state signals and power unit control signals through the acquisition and conversion of various kinds of electricity and software calculation, and changes the AC excitation power supply into controllable DC output control to realize the generator excitation control.