In an age largely characterized by information and communication technology, which uses more and more feeble currents, electrical power is experiencing a period of excellent health and heading toward a bright future. This success is largely due to electric motors, which are available in different types and powered by dc as well as ac sources operating at either utility or variable frequencies. The versatility and ubiquity of electric motors are so wide that they can be found almost everywhere: in many household appliances, technician power tools, building fans, factory machine tools, blowers and pumps of industrial fluid systems, cableways, railway and streetcar locomotives, computer disk drives, drivers and printers, and cell phone vibration alerts.

中文翻译：

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旋转和进化-早期直流电机 [历史]

在信息和通信技术的时代，使用越来越微弱的电流，电力正在经历一个非常健康的时期，并走向光明的未来。这种成功主要归功于电动机，电动机有不同的类型，由直流和交流电源供电，以公用事业或可变频率运行。电动机的多功能性和普遍性如此广泛，几乎无处不在：在许多家用电器、技术电动工具、建筑风扇、工厂机床、工业流体系统的鼓风机和泵、索道、铁路和有轨电车机车、计算机磁盘驱动器、驱动程序和打印机，以及手机振动警报。