简介编辑
a新颖电机控制装置，国外称为Soft Starter。它的主要构成是串接于电源与被控电机之间的三相反并联晶闸管及其电子控制电路。运用不同的方法，控制三相反并联晶闸管的导通角，使被控电机的输入
电压按不同的要求而变化，就可实现不同的功能。软起动器和变频器是两种完全不同用途的产品。变频器是用于需要调速的地方，其输出不但改变电压而且同时改变频率；软起动器实际上是个调压器，用于电机起动时，输出只改变电压并没有改变频率。变频器具备所有软起动器功能，但它的价格比软起动器贵得多，结构也复杂得多。电动机软起动器是运用串接于电源与被控电机之间的软启动器，控制其内部晶闸管的导通角，使电机输入电压从零以预设函数关系逐渐上升，直至启动结束，赋予电机全电压，即为软启动，在软起动过程中，电机起动转矩逐渐增加，转速也逐渐增加。
The voltage is slowly increased from zero to the rated voltage, so that the starting current of the motor in the starting process is controllable from the uncontrollable overload impulse current in the past. And the starting current can be adjusted as needed. There is no impact torque in the whole process of motor starting, but smooth starting operation. This is soft start. [1]
Introduction editor
A novel motor control device, called soft starter abroad. Its main composition is a three-phase anti parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different methods are used to control the conduction angle of the three-phase anti parallel thyristor to make the input of the controlled motor
Different functions can be achieved by changing the voltage according to different requirements. Soft starter and frequency converter are two completely different products. The frequency converter is used where speed regulation is required. Its output changes not only the voltage but also the frequency; The soft starter is actually a voltage regulator. When the motor is started, the output only changes the voltage without changing the frequency. The frequency converter has all the functions of soft starter, but its price is much more expensive than the soft starter, and its structure is much more complex. The motor soft starter uses the soft starter connected in series between the power supply and the controlled motor to control the conduction angle of its internal thyristor, so that the motor input voltage gradually rises from zero with a preset functional relationship until the end of starting, and gives the motor full voltage, that is, soft starting. In the process of soft starting, the motor starting torque gradually increases, and the speed also gradually increases.
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