文档介绍：摘要
随着变频调速异步电动机在国内外市场上日益扩大应用,自90年代中期以来,我国有众多电动机生产企业设计、研制和生产适用于不同应用的各种系列变频调速三相异步电动机,例如:通用变频调速电动机系列、起重冶金变频调速电动机系列、隔爆变频调速电动机系列、电梯变频调速电动机系列、辊道变频调速电动机系列、牵引变频调速电动机系列等。从目前情况看,这些系列电动机能基本满足国内市场的需求原理是当定子三绕组通三相对称电流后,定转子产生旋转磁场,根据右手定则,转子绕组产生感应电动势,由于绕组是闭合的,所以产生感应电流,根据左手定则,转子绕组相当于空间绕组,进而产生电磁转距,合成磁转距大于阻转距时,电机起动,重点是三相异步电动机变频调速,一方面当f1<fN时,为恒转矩调速,转矩不变,额定转速降低,增大起动转矩Tst,另一方面当f1>fN时,为恒功率调速,调速前后功率不变,额定转速升高,减小启动转矩Tst。变频调速可以实现宽范围内的平滑调速,变频调速电机以简单的结构、优良的调速性能、较高的调速比,应用越来越广泛。本论文的主要就是利用三菱变频器,对三相异步电动机进行变频的调速。
关键词:三相异步电动机;三菱变频器;变频调速
Abstract
With the increasing application of VVVF asynchronous motors in the domestic and foreign markets, since the middle of 90's, China's motor manufacturers design, development and production is suitable for various series of Variable-Frequency Adjustable-Speed Three-Phase Asynchronous Motor, different applications such as: General VVVF motor series, crane and metallurgical VVVF motor series, flameproof inverter motor series, VVVF elevator motor series, roller VVVF motor series, inverter-fed motor series. Judging from the current situation, these series motors can basically meet the needs of the domestic market is the principle when the stator winding through three symmetrical three-phase current, stator and rotor rotating ic field is generated, according to the right-hand rule, the rotor winding induced electromotive force, the winding is closed, so generate induction current, according to the left, the rotor winding is equivalent to space winding, and ic torque, starting motor ic torque is greater than the resistance of synthesis of torque,, the focus is variable frequency speed control of three-phase asynchronous motor, hand when F1 < fN, for constant torque speed, torque is not changed, the rated speed is reduced, increase the starting torque of Tst, on the other hand, when F1 > fN, for constant power speed, speed regulation and constant power, rated speed increased, reduce the starting torque Tst. VVVF can achieve smooth speed wide range, frequency conversio