三相异步电机变频调速.doc

三相异步电机变频调速
摘要：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T，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T。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
关键字：恒转矩调速;恒功率调速;三相异步电动机
Graduation design (Thesis) Chinese abstract
Title: three-phase asynchronous motor variable frequency speed regulating
Abstract: the principle is when the stator windings of three symmetrical three-phase current, rotor rotating magnetic field is generated, according to the right hand rule, the rotor winding to generate induced electromotive force, due to the winding is closed, so the induction current is generated, according to the left hand, the rotor winding is equivalent to the space winding, thereby generating electromagnetic torque, synthesis of magnetic torque greater than resistance torque, motor starting
Focus is the three-phase asynchronous motor variable frequency speed control, hand when F1 < Fn, as the constant torque speed, torque constant, rated speed is reduced, increase the starting torque of T, on the other hand, when F1>Fn, for constant power speed regulation, speed regulation and constant power, rated speed rise, reduce the starting torque T. The variable frequency speed control can be achieved over a wide range of average speed regulation, frequency conversion speed regulating motor with simple structure, excellent performance, high speed ratio, is used more and more widely
Keywords: constant torque control; constant power; three-phase asynchronous motor
目录
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4
4
7
7
9
f1＜ fN时，要保持=常数 9
f1＞fN时，要保持U1=UN常数 10
11
论 12
计 体 会 12
主要参考文献： 13

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