基于磁通恒定的多相感应电动机起动过程分析

传统的V/f控制方式在低、中频条件下对多相感应电机进行起动时,由于定子电阻和漏感压降不能忽略,起动过程中的起动电流波动较大,致使多相感应电动机在起动过程中的稳定性能较差。本文以三套三相绕组在空间上互差π/9电角度构成的九相感应电动机为研究对象,对传统的V/f控制方式在低、中频条件下进行了优化。基于DSP+FPGA芯片编程,采用探测线圈反馈九相感应电动机的真实电动势,通过直接控制电动势,并根据电动势与频率的比值为常数的原则,保持电机磁通恒定,以此来起动九相感应电动机。通过实验证明,采用该控制方式起动的九相感应电动机具有更好的稳定性能,优化了九相感应电动机的起动过程。

Analysis of Starting Process of Multi-phase Induction Motor based on Constant Flux

When the traditional V/f control method starts a multi-phase induction motor under low and intermediate frequency conditions,the starting current during the start-up fluctuates greatly due to the stator resistance and leakage inductance voltage drop,which causes poor stability of the multi-phase induction motor during starting.This paper takes nine-phase induction motors composed of three sets of three-phase windings in spatially different π/9 electrical angles as the research object,and optimizes the traditional V/f control method under low and intermediate frequency conditions.Based on the DSP+FPGA chip programming,the detection coil is used to feed back the real electromotive force of the nine-phase induction motor.The nine-phase induction motor is started by directly controlling the electromotive force and according to the principle that the ratio of the electromotive force and the frequency is constant to keep the motor flux constant.It is also proved by experiments that the use of this control method to start a nine-phase induction motor has better stability and optimizes the starting process of a nine-phase induction motor.