41391-454-01-S1FXAB罗克韦尔软启动控制头

41391-454-01-S1FXAB罗克韦尔软启动控制头

41391-454-01-S1FXAB罗克韦尔软启动控制头

它是以三相波形整体生成效果为前提，以逼近电机气隙的理想圆形旋转磁场轨迹为目的，一次生成三相调制波形，以内切多边形逼近圆的方式进行控制的。

经实践使用后又有所改进，即引入频率补偿，能消除速度控制的误差;通过反馈估算磁链幅值，消除低速时定子电阻的影响;将输出电压、电流闭环，以提高动态的精度和稳定度。但控制电路环节较多，且没有引入转矩的调节，所以系统性能没有得到根本改善。

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。

41391-454-01-S1FXAB罗克韦尔软启动控制头

It is based on the whole generation effect of the three-phase waveform, and for the purpose of approximating the ideal circular rotating magnetic field trajectory of the motor air gap, the three-phase modulated waveform is generated at one time, and the method of inner tangent polygon approximating the circle is controlled.

After practical use, it has been improved by introducing frequency compensation, which can eliminate the error of speed control. The flux amplitude is estimated by feedback to eliminate the influence of stator resistance at low speed. The output voltage and current are closed to improve the dynamic accuracy and stability. However, there are many control circuit links, and no torque adjustment is introduced, so the system performance has not been fundamentally improved.

The control circuit is the circuit that provides the control signal to the main circuit of the induction motor power supply (voltage and frequency adjustable). It has the "operation circuit" of the frequency and voltage, the "voltage and current detection circuit" of the main circuit, the "speed detection circuit" of the motor, and the "drive circuit" that amplifiers the control signal of the operation circuit. And inverter and motor "protection circuit" composition.