变频调速知识（Knowledge of variable frequency speed regulation）.docVIP

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变频调速知识（Knowledge of variable frequency speed regulation）.doc

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变频调速知识（Knowledge of variable frequency speed regulation）

变频调速知识（Knowledge of variable frequency speed regulation） Section 1 basic concept of AC converter Master the meaning and characteristics of various basic control modes of AC frequency conversion speed regulation Mastering the control law of frequency conversion speed regulation system n=60f/p Control mode of AC frequency conversion speed regulation Control method of three-phase asynchronous motor constant flux control, constant current control and constant power Control mode three. 1. constant magnetic flux control mode In the motor speed regulation, all the magnetic flux in the motor is expected to remain the same as the rated value. Flux is too weak, The iron core of an electric motor has not been fully utilized; it is a waste; if it increases the magnetic flux, it will saturate the core so that it can lead to the core of the motor Excessive excitation current is caused, and the motor is damaged when the winding is too serious. DC motor speed regulation by The Yu Lici system is independent, and it is very easy to keep the flux constant as long as the compensation of the armature reaction is appropriate. But in AC induction motors, the flux is generated by the magnetomotive force of the stator and rotor, which is better than that of the DC motor Its a lot more complicated. The effective values of the induction electromotive force of each phase of the stator winding of the three-phase asynchronous motor are calculated: E=4.44, l, Nl, K, Phi M Type 1-- stator frequency; N1 - stator series turns per phase winding; K- fundamental winding factor; Mm m- air gap flux per pole. According to the above equation, if we want to keep unchanged when the frequency of Ou, f from the rated frequency of 1?. Down regulation must be reduced at the same time Eg, so that the Eg/ 1= constant. The electric potential is high, can ignore the stator resistance voltage drop is approximately equal to the electromotive force of the stator voltage, U1 = E. Therefore, if the stator power supply vo