用准精确等效电路计算异步电动机的性能

The Analysis of Quasi Exact Equivalent Circuit of Asynchronous Machines

本文对在异步电机精确等效电路中令r_m=0的准精确等效电路进行了实例分析计算,同时用精确和简化等效电路进行了对比计算.结果表明,用准精确等效电路计算,电磁转矩T_m,最大转矩T_(max)及发生最大转矩时的转差率S_m等,可用简捷的实数形式表达,且有关电机各项性能的计算结果与用精确等效电路计算出的结果十分接近,这给实际应用带来了很大方便.

In this paper, analysis and calculation are carried out with a quasiexact equivalent circuit of asynchronous machines which comes from a exact equivalent circuit with r_m=0. And calculations are also carried out with the exact and the simplified equivalent circuits for the comparison. As a result, with the quasi-exact equivalent circuit, the developed torque, the slip at maximum torque and the maximum torque can be easily expressed by a real number form and the calculated performances are very closed with the exact equivalent circuit. This makes it very convenient for the practical uses. Also we can see that the errors of the performances are under the 5% with the simplified equivalent circuit.