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异步电动机的转速公式为:n=(60f_o)/p(1-s) (1)显然,调节f_o是最直接的调速方案。交一交变频调速系统就是这种调速方案的一类实现。对于采用电网电压换流的交——交变频器,欲获得正弦的平均输出电压,余弦交叉法是波形调制的正确方法之一。然而,该方法技术上的复杂性和庞大的体积将使系统的可靠性与实用性降低。本文所讨论的连续移相式交——交变频器,既克服了控制技术复杂这一不足,又保持了余弦法所具有的性能。 1 工作原理令(1)式中s=o即为异步电动机旋转磁场的转速公式。用q相固定工频电压对异步电动机
Asynchronous motor speed formula: n = (60f_o) / p (1-s) (1) Obviously, the regulation f_o is the most direct speed control program. To pay a frequency conversion speed control system is a kind of speed control program to achieve. For AC-DC converters with grid voltage commutation, the cosine crossover method is one of the correct methods of waveform modulation in order to obtain the average sinusoidal output voltage. However, the technical complexity and huge volume of the method will reduce the reliability and practicability of the system. The continuous phase shift AC-AC inverter discussed in this paper not only overcomes the shortcomings of the complicated control technology but also maintains the performance of the cosine method. 1 working principle Let (1) where s = o is the rotational speed of the induction motor rotating magnetic field formula. With q phase frequency voltage fixed to the asynchronous motor