|
所在平台: Udemy |
课程主页: https://www.udemy.com/course/ac-motors-single-and-three-phase/
课程评论：没有评论
**课程名称：** 单相和三相交流电机 **课程概述：** 本课程旨在教授学员单相电机的运行、结构和接线。课程将从单相交流电生成及其在单相交流电机运行中的应用讲起。通过图形和演示，课程将深入探讨交流电机的结构，并解析交流作用产生的磁场间的相互作用。学员将了解单相电机为何不能自启动，以及用于启动该电机的各种方法和材料，如分相启动和离心开关。随后，课程将演示如何将单相电机接线至双电压（120V和208V）运行，并学习如何改变单相电机的转向。课程还将讨论在单相电机启动过程中增加电容器的作用。 接着，课程将介绍三相电机的结构、运行和双电压接线。将回顾三相电生成及其在电机启动和运行中的作用。学员将学习三相电机的低电压和高电压接线方式，以及如何改变三相电机的转向。最后，课程将讲解NEMA（美国国家电气制造商协会）要求的铭牌数据，包括电压、电流、马力等级、相数、环境温度等级、机架尺寸、代表电机启动涌入电流的代号字母，以及允许电机安全运行的额定功率百分比的服务系数（SF）。
In this course students will learn the operation, construction, and wiring of single phase motors. It will begin with a review of single phase AC generation and how it directly applies to the operation of single phase AC motors. With graphics and demonstrations, we will the look into the construction of an AC motor and discuss the interactions of magnetic fields created by the AC action. You will learn why a single phase motor is not self-starting, and the methods and materials used to start this motor such as the split-phase and the centrifugal switch. We will then wire the single phase motor for dual voltage operation; 120 and 208 volts respectively. After this, the students will be able to see how a single phase motor is reversed. We will discuss the purpose of adding a capacitor for the starting operation of a single phase motor. Next, we will look at the construction, operation, and wiring of a three phase dual voltage motor for dual voltage operating. There will be a review of three phase generation and how it aids in the starting and running of the motor. You'll see how a three phase motor is wired for low and high voltage operation, and how the three phase motor is reversed. You'll learn about the nameplate data that is required by NEMA to include voltage, amperage, HP rating, number of phases, ambient temperature ratings, frame size, code letters that represent the start up inrush current allowed for the motor, and the service factor (SF) which lets you know what percentage above rated wattages the motor can safely operate.
