| 为什么变频器的电压与频率成比例的改变? |
| 添加时间：2019/11/18 16:14:05 浏览次数： |
| 为什么变频器的电压与频率成比例的改变? Why does the voltage and frequency of the converter change proportionally? 任何电动机的电磁转矩都是电流和磁通相互作用的结果，电流是不允许超过额定值的，否则将引起电动机的发热。因此，如果磁通减小，电磁转矩也必减小，导致带载能力降低。 The electromagnetic torque of any motor is the result of the interaction of current and flux. The current is not allowed to exceed the rated value, otherwise it will cause the motor to heat up. Therefore, if the magnetic flux is reduced, the electromagnetic torque must also be reduced, resulting in a reduction in the carrying capacity. 由公式E=4.44*K*F*N*Φ 可以看出，在变频调速时，电动机的磁路随着运行频率fX是在相当大的范围内变化，它极容易使电动机的磁路严重饱和，导致励磁电流的波形严重畸变，产生峰值很高的尖峰电流。 From the formula e = 4.44 * k * f * n * Φ, it can be seen that the magnetic circuit of the motor changes in a considerable range with the operating frequency FX, which easily saturates the magnetic circuit of the motor, causes serious distortion of the waveform of the excitation current, and produces high peak current. 因此，频率与电压要成比例地改变，即改变频率的同时控制变频器输出电压，使电动机的磁通保持一定，避免弱磁和磁饱和现象的产生。这种控制方式多用于风机、泵类节能型变频器。 Therefore, the frequency and voltage should be changed in proportion, that is, the output voltage of the converter should be controlled while the frequency is changed, so that the flux of the motor can be maintained to a certain extent, and the phenomenon of weak magnetic field and magnetic saturation can be avoided. This control mode is mostly used for energy-saving inverter of fans and pumps. |
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