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首页> 外文期刊>IEEE Transactions on Industry Applications >Energy-efficient induction motors performance characteristics and life-cycle cost comparisons for centrifugal loads
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Energy-efficient induction motors performance characteristics and life-cycle cost comparisons for centrifugal loads

机译：节能高效感应电动机的性能特征和离心负载的生命周期成本比较

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摘要

When fixed-speed motors (fed directly at power frequency) are purchased for new installations or for replacements, the loaded shaft speed differences among motor options are either ignored or overestimated. The most common first-cut estimate is that the consumed shaft power will vary as the cube of the ratio of the motor rated nameplate speeds for centrifugal driven loads that have discharge control valves (on pressure or now control). In actuality, this is true only if the motors are loaded at approximately nameplate output. This paper discusses the true "control valve loss" factor taking into account actual speed differences among motor options. A simplified equation and figure are presented to permit quick evaluation of motor purchase alternatives for the lowest life-cycle cost based on efficiency and rated-load speed differences. NEMA standards on slip-speed variation should be made more stringent to increase the validity of speed-difference loss evaluations. Additionally, efficiency test results and loaded speed measurements for standard-efficiency and premium-efficiency 10 and 100 hp motors are presented, leading to a conclusion that standard-efficiency motors should be operated at no higher than rated voltage and that premium-efficiency motors should he operated at 5%-10% above rated voltage for best system efficiency.
机译：购买用于新安装或更换的定速电动机（直接以工频供电）时，会忽略或高估了电动机选件之间的负载轴速度差。最常见的第一手估算是，对于带有排气控制阀（有压力或现在有控制）的离心驱动负载，所消耗的轴功率会随着电动机额定铭牌速度比的立方变化。实际上，只有在电动机以近似铭牌输出的方式加载时，这才是正确的。本文讨论了真正的“控制阀损耗”因素，其中考虑了电动机选件之间的实际速度差异。给出了简化的方程式和图形，以便基于效率和额定负载速度差，以最低的生命周期成本快速评估电动机的购买选择。 NEMA关于滑移速度变化的标准应更加严格，以提高速度差损失评估的有效性。此外，还提供了效率为10 hp和100 hp的标准效率和超高效率电机的效率测试结果和负载速度测量结果，得出的结论是，标准效率的电机应在不高于额定电压的条件下运行，而超效率的电机应在不高于额定电压的条件下运行。他在高于额定电压5％-10％的条件下工作，以实现最佳系统效率。

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