深圳免费活动！一场活动搞懂直流有刷电机（还有各.....
我相信有刷电机应该是大家最早接触的一类电机，大家中学物理课堂上学习电动机，基本都是以它为模型展示的。有刷电机的主要结构就是定子+转子+电刷，通过旋转磁场获得转动力矩，从而输出动能。电刷与换向器不断接触摩擦，在转动中起到导电和换相作用。相较步进电机，直流有刷电机的结构更简单，且具备速度响应快，起动力矩大，转动特性呈线性等优点，在市场中有着最广泛的使用。
虽然我们知道直流有刷电机的这些特点，但你有想过背后的原因吗？作为对万物都有究根结底的maker社群，我们必然要深入了解直流有刷电机的。3月31日（周三）晚柴火共进社，我们将邀请罗姆半导体的电机产品专家刘烁刘工，为社区奉上一场直流有刷电机的知识盛宴。
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分享者：刘烁(Sword Liu)2011年毕业于中山大学微电子学系，加入罗姆半导体前主要从事办公类电子产品的设计及开发工作。2016年加入罗姆半导体(深圳)有限公司，一直负责电机产品的客户支持，协助客户解决应用罗姆电机驱动芯片时遇到的问题。
这次分享作为前两次步进电机主题活动的延展，除了会简单回顾步进电机的基本转动原理和驱动测试演示之外，会特别聚焦直流有刷电机。主要分享内容如下：
01 直流有刷电机的基本原理及工作模式 https://admin.chaihuo.org/uploadfiles/img/2021030409351471480e878c32-f723-49ac-a1a0-dd7d5bb1500d23.pnghttps://admin.chaihuo.org/uploadfiles/img/202103040935372461e67389a2-7f79-43de-8746-7666ac51f8b723.png
02 直流有刷电机的基本控制PWM(脉宽调制)控制
直流有刷电机的力矩与电流呈正比例关系。通过PWM控制实现电源电压有限值的控制，实现对电流变化的控制，可以对电机的输出力矩进行调整。
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03 直流有刷电机的定速控制通过PI算法实现闭环控制
通过PWM控制只能实现电机的开环控制，在外部条件(如电源，负载)发生变化时，电机速度也会产生变化。而通过检测速度反馈信号并加入PI算法之后，可实现电机定速控制。现场将通过Arduino及BD62193TL的DEMO板进行演示和讲解。
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PID算法的基本框图https://admin.chaihuo.org/uploadfiles/img/202103040936402617240ec7ff-01d2-4923-a0f5-c3e824021b2823.png
BD62193TL DEMO板图片
彩蛋在此为了回馈社区，罗姆深圳分公司在活动现场准备了限量的BD62193TL DEMO板（该板使用方便，常应用于机器人竞赛ROBOCON项目制作）将在本次活动现场免费送出。此外，我们还在现场准备了一个搭载了罗姆热敏打印头的便携式标签打印机（
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