Induction Heater Tutorial
感应加热器教程
3kw
An induction heater is an interesting device, allowing one to rapidly迅速的 heat a
metal object. With enough power, one can even甚至 melt熔化 metal. The induction
heater works without the need for fossil化石 fuels, and can anneal退火 and heat
objects of various各种各样 shapes形状. I t out to make an induction heater that文学名著有哪些书
could melt steel and aluminum. So far迄今为止 I have been able to feed an input
power of over 3 kilowatts! Now that I have done this I would like to share how it
works, and how you can build one. At the end of the tutorial I will discuss论述 and
show you how to build a levitation coil that will allow you to boil煮沸 metals while
毛线贴画suspended in mid air!
一台感应加热器是一台有趣的设备，可以迅速加热金属工件.功率够高时，可以融化金属.感
应加热器不需要石化燃料，可以对工件退火处理，还可以加热各种形状的工件.我制造了一
台可以融化钢和铝的感应加热器.现在功率已经达到了3千瓦!我来教你怎么造一台.在教程
的最后，我将教你造一个可以在半空中融化金属的磁悬浮加热线圈.
My induction heater is an inverter. An inverter takes a DC power source and converts
迅雷下载太慢it into AC power. The AC power drives a transformer which is coupled耦合 to a ries
LC tank. The inverter frequency is t to the tank's resonant共振 frequency, allowing
the generation of very (high currents高安培电流) within the tank's coil. The coil is
coupled to the workpiece工件 and ts up (eddy currents涡电流). The currents,
traveling through a conductive, but slightly微小 resistive电阻的 workpiece, heat the
piece. Remember, Power = Heat = R*I^2. The workpiece is like a one-turn coil; the
work coils has veral数个 turns圈. Thus这样, we have a (step-down transformer降压
器), so even higher currents are generated in the workpiece.这样电流就流进工件里去
了.
我的感应加热器有一个逆变器.逆变器可以把直流电转换为交流电.交流电被变压器耦合到
感应线圈和电容组一起组成的振荡器上.逆变器的工作频率决定振荡器的振荡频率.振荡器的感应线圈会感应出非常大的电流.感应线圈又将这些电流产生的磁场耦合到工件上产生涡流电.工件中的电阻，阻碍涡流电的流动，导致工件发热.(详细原理参照变压器中的涡流电).记住，功率=热=R乘以I的平方.工件可以看成一个只有一圈的线圈，而感应线圈有多个线圈，这样一来就可以把感应线圈和工件看成一个变压器回路，工件的电压低，电流就从感应线圈流向工件去了.
I would like to acknowledge鸣谢 the invaluable无法估计的 help from John Dearmond and Tim Williams for helping me understand this topic话题. Now, before we talk more, let's e some pictures of what it can do.
谢谢 John Dearmond 和 Tim William大量的帮助，帮我弄明白这个话题.先来看几张图.
Later, I will give a link to a video showing it running. Here is the inverter.下图是逆变器:
绿色的绿拼音
What I will now do is go over each part. Then, I will give the schematics电路图, go over them and how you can build this device.
我将介绍每一个部分.然后给出电路图.然后你就明白怎么造了.
Induction Heater Components
感应加热器的组成部分
We will talk about each component部分( making up组成) the induction heater. First,
there is the workcoil. This is what heats the workpiece. The workcoil will get very hot
from the high current going through it and the radiation of heat from the workpiece.
我们将讨论感应加热器的零件话题.首先是感应线圈, 它有高压电流，被加热的工件会将热
回传到感应线圈上.
The workcoil is attached to the LC tank. This can either be a ries or parallel
(resonant tank谐振回路). The tank and coil need to be cool, so I implemented a
plumbing水管装置-type design that allows me to pump water through the coil using a
fountain喷水 pump.
感应线圈与电容组组成振荡器.它可以是串联振荡器也可以是并联振荡器.我搞了个泵抽水
来冷却电容组和感应线圈.
The resonant tank is coupled to the power source with a (coupling transformer耦合变
压器). The transformer is connected to the inverter.
冬虫夏草的功能谐振回路靠耦合变压器来与逆变器相连.
The inverter chops the DC power source at a particular特定的 frequency. This is the
(resonant frequency谐振频率) of the tank. Now, as the workpiece heats and goes
through its (curie point居里温度点) - the temperature when the metal is no longer
ferromagnetic - the resonant frequency changes. The inverter needs to stay locked on
as cloly as possible to the current resonant frequency to achieve获得 the fullest
power. Some will do this manually手动, using an oscilloscope示波器 to monitor the
waveforms, or using a voltmeter伏特计 on the tank and tuning the frequency to the
highest tank voltage. Another method is using a pha locked loop (PLL) to monitor
the (pha relationship相位关系) of the inverter voltage and tank voltage. This is the
method I u and I will discuss论述 this in detail later on.
逆变器将直流电转换成交流电的频率是振荡器的谐振频率.工件温度升高并穿过居里点，本身特有磁性消失，会改变振荡器的谐振频率.逆变器必须将直交流变换频率锁定在当前振荡器的谐振频率以获得最大功率.这项工作可以手工进行，用示波器和电压表对振荡器的波形和电压调整来调谐振荡频率以获得振荡器最大工作电压.另一种方法是用锁相环通过相位关系来控制逆变器和振荡器的电压.这种方法等会儿说.
Let's start with how to easily make a workcoil. We will be using frequencies in the 10s to 100s of kilohertz (kHz), so metals will conduct传导 the current only slightly (below the surface深入). This is the (skin effect趋肤效应). The current depth深度 in mm is
先来做个感应线圈.频率范围10khz~100khz.电流透入工件的深度有趋肤效应用下式计算.
Depth (mm) = 76/√(F)
深度(毫米)=76除以根号(频率)
荷叶画法
炖兔子肉
So, the wider the tubing, the lower the resistance. We also want to u tubing so we can water-cool the coil. I purchad购买 some refrigerator水箱 3/8" copper tubing from Home Depot. You will also need some 1/2" copper pipe and the necessary fittings配件 so you can feed water through one end,
have it circulate循环 through the coil, and come out the other end. I have (brass fittings黄酮配件) with nipples接头 so I can attach some tubing to my fountain pump, and a return tube to my ice water bath.财源滚滚图片
大铜管小电阻.铜管可以水冷.我从五金商店买了些3/8''的铜管.你还要买些1/2''的铜管，和铜接头，把它们焊在一起连上泵，就能让水循环了.
This is the tubing I got from Home Depot.
铜管.
