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Temperature changes affect electromagnet attraction

When the temperature rises, the electromagnet attraction decreases. This is because the temperature rise causes the resistance of the magnet wire circle to increase, and the amperage value decreases. When the solenoid coil temperature changes, the resistance value of the solenoid coil changes with the temperature coefficient and is calculated by the following formula:
The actual ohmic calculation method: The room temperature is 20 °C as the calculation standard, the temperature rises by 1 °C, the electromagnet increases 0. 0 0 4 ohms per ohm.
The formula is: R t = [l + (t - 20)X0.004 ) XR20
R t : ohmic value at room temperature t°C; R 20 : ohmic value at room temperature 20°C; t : ambient temperature during operation.
1. Electromagnetic voltage changes affect attraction
When the electromagnet voltage changes, the amperage and the attractive force change. This must be taken into account when designing attractiveness.
2. Electromagnetic core shape affects attraction
The performance of electromagnets is closely related to the shape of sliders and iron cores. Although there are differences between electromagnets of different sizes, in general, there are the following relations between the angles and strokes of sliders and iron cores:

3. Effect of electromagnet remanence
Even when the magnetic field is removed, some residual magnetic force remains. These remanent magnetism may hinder the slide bar from resetting, causing poor use. Therefore, when choosing an electromagnet, the remanence of the electromagnet needs to be considered as an important factor. We will use appropriate methods to eliminate remanence.

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