| 逆变器 |
| 添加时间：2019/2/15 15:09:55 浏览次数： |
| 同整流器相反，逆变器是将直流功率变换为所要求频率的交流功率，以所确定的时间使6个开关器件导通、关断就可以得到3相交流输出。以电压型pwm逆变器为例示出开关时间和电压波形。 Contrary to the rectifier, the inverter converts DC power to AC power at the required frequency, and three-phase AC output can be obtained by turning on and off six switching devices at a given time. The switching time and voltage waveform of the voltage source PWM inverter are illustrated. 控制电路是给异步电动机供电（电压、频率可调）的主电路提供控制信号的回路，它有频率、电压的“运算电路”，主电路的“电压、电流检测电路”，电动机的“速度检测电路”，将运算电路的控制信号进行放大的“驱动电路”，以及逆变器和电动机的“保护电路”组成。 The control circuit is a circuit that provides control signals to the main circuit of the power supply (voltage and frequency adjustable) of the asynchronous motor. It has the "operation circuit" of frequency and voltage, the "voltage and current detection circuit" of the main circuit, the "speed dwww.dianjiareguan.net.cnwww.yanglaoyuant.cnpenlinguan.37ix.com.cnweikuangg.37ix.com.cnu xingcao.37ix.com.cnwww.rerongjiaoji.org.cnetection circuit" of the motor, the "driving circuit" which amplifies the control signal of the operation circuit, and the "protective electricity" of the inverters and motors. "Road" composition. （1）运算电路：将外部的速度、转矩等指令同检测电路的电流、电压信号进行比较运算，决定逆变器的输出电压、频率。(1) Operating circuit: Comparing the external speed and torque instructions with the current and voltage signals of the detection circuit, the output voltage and frequency of the inverter are determined. （2）电压、电流检测电路：与主回路电位隔离检测电压、电流等。 (2) Voltage and Current Detection Circuit: Isolate the main circuit potential to detect voltage and current, etc. （3）驱动电路：驱动主电路器件的电路。它与控制电路隔离使主电路器件导通、关断。 (3) Driving circuit: the circuit that drives the main circuit device. It is isolated from the control circuit to turn on and off the main circuit components. （4）速度检测电路:以装在异步电动机轴机上的速度检测器(tg、plg等)的信号为速度信号，送入运算回路，根据指令和运算可使电动机按指令速度运转。 (4) Speed detection circuit: Take the signal of speed detector (tg, plg, etc.) mounted on the shaft machine of asynchronous motor as speed signal, and send it into the operation circuit. According to the instruction and operation, the motor can run at the instruction speed. （5）保护电路：检测主电路的电压、电流等，当发生过载或过电压等异常时，为了防止逆变器和异步电动机损坏 (5) Protection Circuit: Detecting the voltage and current of the main circuit, in order to prevent the damage of inverters and asynchronous motors when overload or overvoltage occurs. |
| 上一页 通用和高压变频大发展阶段 |
| 下一页 PLC控制柜使用的环境温度要求 |
Copyright © 技术支持：遨游网络