通过对放纸辊电机运行特点的分析，说明在选择电机额定功率时，关键是计算电机的最大负载电流。

Based on the analysis of operation characteristics of the unwind motor, we proved that the calculation of the motor's maximum current is the key for selecting the motor rated power.

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另外，本文还就异步电机在非额定状态下运行时，输出功率的计算公式及如何实现效率优化等问题进行了讨论。

Moreover, this text discuss the calculation formula of the output power when motor is working at unrated circulation and how to realize excellent efficiency.

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永磁体分散性对空载电流、空载功率因数、负载功率因数和过载能力影响较大，而对额定运行时的效率、电流影响不大。

In addition, the dispersibility has great effects on the noload current and power factor while the effect on rated efficiency and rated current is little.

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