How should we apply relevant theories and rules when designing sensors for high-frequency induction heating equipment?

When it comes to inductors, basically everyone who knows heat treatment knows its importance. It is an important part of high-frequency induction heating equipment and is necessary for heating workpieces. The quality of the sensor directly affects the quality of the heat treatment of the workpiece. Since the sensor is so important, we must strictly follow its requirements and theoretical rules when making it. Today, we won’t talk about how to make a sensor. Let’s talk about how we should apply theoretical theories and laws when designing a sensor.

(1) Selection of reasonable eddy current paths. When the gear heats the entire ring of teeth at the same time, it is required that both the tooth top and the tooth groove can be heated. A loop-shaped inductor with an annular induced current should be selected so that eddy currents can pass through the key tops, bottoms, and shaft shoulders, thereby making each The heating temperature is consistent.

(2) Local vortex concentration phenomenon. During induction heating, eddy current concentration sometimes occurs at the sharp corners, small holes, and small arcs of parts. This phenomenon becomes more significant when the current frequency increases.

(3) The characteristic of current taking shortcuts. The tendency of current to take shortcuts is because the resistance is low when taking shortcuts. Therefore, this factor should be considered when selecting parts with thick copper plates in the sensor.

(4) Proximity effect. There is a proximity effect between two conductors with opposite current directions between the conductive plates (tubes) of the inductor. There is a proximity effect between two conductors with the same current direction between the turns of a multi-turn inductor. There is a proximity effect between all inductor effective circles and the heated workpiece. In sensor design, if the proximity effect can be cleverly utilized, the efficiency of the sensor can be greatly improved.

(5) The driving effect of the magnetic conductor on the effective circle. The effective coil of the inductor is equipped with a magnetic conductor. When high-frequency current passes through the conductor, due to the large magnetic flux density in the core and the large self-inductance potential, the current is driven to the opening side with small inductance resistance.