磁感應(yīng)電機(jī)軟啟動(dòng)外文翻譯(參考版)
2025-05-16 19:51本頁(yè)面
【正文】 s market, but they do still exist. The technology is not always easily recognizable as such with terms such as three pulse technology being used to describe SCRDiode systems as opposed to six pulse technology describing SCRSCR systems. Closed Loop starters monitor an output characteristic or effect from the starting action and dynamically modify the start voltage profile to cause the desired response. The most mon closed loop soft starter is the controlled current soft starter where the current drawn by the motor during start is monitored and controlled to give either a constant current, or a current ramp soft start. A much rarer closed loop format is the constant acceleration soft start where the motor speed is monitored by a tachogenerator or shaft encoder and the voltage is controlled to maintain a constant rate of acceleration or a linear increase in motor speed. The controlled current soft starters are available with varying levels of sophistication. In the most basic systems, the soft starter is essentially a standard TVR soft starter with a ramp freeze option where the current on one phase is monitored and pared to a set point. If the current exceeds the set point, the ramp is frozen until the current drops below that set point. At the other end of the scale, a prehensive closed loop soft starter will monitor the current on all three phases and dynamically change the output voltage to correct the start current to the required profile. This system is able to both increase and reduce the start voltage to suit the application. A constant current starter will start initially at zero volts and rapidly increase the output voltage until the required current is delivered to the motor, and then adjust the output voltage while the motor is starting until either full voltage is reached, or the motor overload protection operates. Constant current starters are ideal for high inertia loads, or loads where the starting torque requirements do not alter. The current ramp soft starter operates in the same manner as the constant current soft starter except that the current is ramped from an initial start current to a current limit setting over a period of time. The initial start current, current limit, and the ramp time are all user adjustable settings and should be customize to suit the application. The current ramp soft starter can be used for a number of advantages over constant curren
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