Making a control Loop for an induction heater - PLC Talk

The Power supply is controlled linearly with 0V meaning 0 Kw and 10V meaning 25 Kw.

And to add some context. the induction heater is heating up a stabilizer bar for a car to bond a bushing. The internal temperature of the bushing needs to be 170 degrees C + for a good bond. The temperature does rise slightly after the induction unit is turned off but its not an issue.

the way we have it now, when we set it up manually, we make a relationship between the internal temperature of the bar and and external using a pyrometer. for example, change the power settings until we get a cycle time we like, and then measure what the external temperature is when the internal temperature reaches 170 degrees C. The external temperature is now the setpoint for the PLC. The PLC with look for the external temperature to be at the setpoint, and then turn off the induction unit.

What I'm trying to do is to give the PLC the information of the internal temperature, external temperature and a set amount of time. The PLC will then command the heaters to heat the bar by adjusting the kw setting on the power supplies until the internal temp is reached. The PLC will essentially record the cycle it just did in an array. and then when you go to auto, the PLC will playback that calibrated array and the power supplies will run the same power settings as when it was being calibrated.

Hopefully this provided some more information on the setup I'm working with.

right now I made a hysteresis control program that will turn the heater on to a set kw rating if the internal temperature is below what it should be at a given point in time, and turn off if its above. I haven't tested it yet but i have a feeling it could work. probably not the most ideal way but I'm not too familiar with PID control yet which i think would be the proper way to do things.

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Whether you are acknowledge with induction heating or it&#;s the first time that you get in touch with this technology, this following article is going to offer some frequently asked questions about induction heating so that help you have a general idea about it.

What is induction heating?

The heating method known as induction heating occurs when an electrically conductive material is placed in a varying magnetic field. Induction heating is a rapid form of heating in which a current is induced directly into the part being heated. In this way, induction heating is a non-contact form of heating.

Is it possible to braze glass or ceramics with induction?

If you are looking for more details, kindly visit induction heater controller.

Yes, of course. If you want to work with glass or ceramics, then a compact vacuum furnace is a great solution for brazing. You&#;ll get quick, clean heat with very precise temperature control.

What makes up a typical induction heating system?

A typical induction heating system consists of the induction heating power supply, an induction heating coil, and a water-cooling source, which cools the coil and several internal components inside the power supply. The induction heating power supply sends alternating current through the induction coil, thus generating a magnetic field. When a work piece is placed within the coil and enters the magnetic field, eddy currents are induced within the work piece, generating precise and localized heat without any physical contact between the induction coil and the work piece.

What is an induction heating coil (inductor)?

The varying magnetic field required for induction heating is developed in the induction heating coil via the flow of AC (alternating current) in the coil. The coil can be made in many shapes and sizes to custom fit a specific application. The coils can range from tiny coils made of copper tubing used for precise heating of extremely small parts in applications such as soldering and ferrule heating to large coil assemblies of copper tubing used in applications such as strip metal heating and pipe heating.

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