【摘要】 三相感应电动机离散变频软起动在限制大的起动电流的同时,能够保证足够大的起动转矩,非常适用于重载起动的设备。优先选取存在正序对称的相位角组合的分频频率,而有些分频电压不存在正序对称的相位组合。该文以2分频为例,采用对称分量法结合仿真分析来确定这些分频基波电压相位角组合。在理论基础上,利用SIMULINK建立不同相位角组合下起动的仿真。结果表明,选取合适的相位角的组合能使电机以高转矩和较小的起动电流起动。更多还原

【Abstract】 Discrete variable frequency soft starting for three-phase asynchronous motors can restrain bit starting current,and ensure too enough starting torque.It can be well applied for devices with high load.Firstly,choose the discrete variable frequency with the symmetrical positive-sequence combination of phase angle.But there is no positive-sequence combination of phase angle in some discrete variable frequency.In this paper take the 2 discrete frequency for exemple,determine the optical combination of phase angle with the discrete variable frequency by three phase symmetry component method.Based on the theory,simulation of different combinations of phase angle is established by the SIMULINK.The experiment approves the optical combination of phase angle can star motor with high strating torque and small starting current.更多还原