Efficiency improvements attainable with permanent magnet (PM) motors have been well documented. Some PM motors have been equipped with an induction cage in the rotor to allow direct online (DOL) starting. Designs of this type have been referred to as line-start PM (LSPM) motors. A topic that has not received much attention is the use of this type of motor with an adjustable-speed drive (ASD). This article introduces the terminology caged-rotor PM (CRPM) motor to describe motors of this type that can be used either DOL or with an ASD. The details of several installations of CRPM motors are discussed. Each case study is documented from application selection to motor specification, cost justification, installation, operation, and measured performance.

中文翻译：

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用笼型转子永磁电机代替感应电机：应用注意事项和成本分析

永磁 (PM) 电机可实现的效率改进已得到充分证明。一些永磁电机在转子中配备了感应笼，以允许直接在线 (DOL) 启动。这种类型的设计被称为线性启动 PM (LSPM) 电机。一个没有受到太多关注的话题是使用这种带有可调速驱动器 (ASD) 的电机。本文介绍了笼式转子永磁 (CRPM) 电机这一术语，以描述可用于 DOL 或 ASD 的此类电机。讨论了几种 CRPM 电机安装的细节。每个案例研究都记录在案，从应用选择到电机规格、成本合理性、安装、操作和测量性能。