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本文介绍了由微处理机控制的50千瓦直流到三相变频晶闸管逆变器,它适用于忠应电动机的速度和/或转矩控制。微处理机按实时分析速度和转矩要求,电流和转子速度反馈信号并计算出输出频率的需要量。微处理机直接控制晶闸管逆变器桥式电路和所有的换向电路。微处理机的编程能务允许三相众笼或忠应电机控制系用不同的编程方式:即滑差控制、脉宽调制,恒电流控制等。整个控制系统用器象限控制的滑差方式说明,包括应用在主桥晶闸管的电流脉冲位移换向方面的新奇的直流桥换向技术。
This article describes a 50 kW DC-to-three-phase variable-frequency thyristor inverter controlled by a microprocessor, which is suitable for speed and/or torque control of a true motor. The microprocessor analyzes the speed and torque requirements in real time, the current and rotor speed feedback signals and calculates the required output frequency. The microprocessor directly controls the thyristor inverter bridge circuit and all the commutation circuits. The programming of the microprocessor allows the three-phase public cage or the faithful motor control system to use different programming methods: slip control, pulse width modulation, and constant current control. The description of the slip mode of the quadrant control of the entire control system includes the novel DC bridge commutation technology applied to the current pulse displacement commutation of the main bridge thyristor.