What is the relationship between the resistance of the solenoid valve coil and the reason why the resistance of the solenoid valve coil increases?

Solenoid valve coil What does the resistance have to do with it?

Resistance determines power. The greater the power, the faster the valve response. Different applications require valves with different powers. All this has the most to do with resistance. But if the valves are of the same model, the power should be the same. It can't be that much different. Power = voltage squared divided by resistance. With the rated voltage and resistance, you can know its power. Solenoid valves have different resistance values ​​depending on the manufacturer and type, most of which are in the tens of Dozens of ohms, generally the more turns the coil has, the greater the resistance value, the greater the power and the stronger the suction force.

Electromagnetic Reasons for the increase in valve coil resistance

This is because large-wattage solenoid valves have protection circuits. When the bridge diode is broken down, it will be short-circuited. Once the short-circuit occurs, the resistance will increase.

When a current flows through a wire, a certain electromagnetic field will be generated around the wire, and the wire itself of this electromagnetic field will induce the wires within the range of this electromagnetic field.

The electrical characteristics of the inductor coil are opposite to those of the capacitor, "passing low frequencies and blocking high frequencies." When high-frequency signals pass through the electromagnetic coil, they will encounter great resistance and are difficult to pass;while when low-frequency signals pass through it, the resistance presented is relatively small, that is, low-frequency signals can pass through it more easily. The resistance of the solenoid to direct current is almost zero.

Generally, these high-wattage solenoid valves have a protection circuit, and a resistor is connected in series with high resistance. If the bridge diode is broken down, it will be short-circuited. The answers given by the following people are incorrect. Each solenoid valve has a different resistance value. , the protection circuit is also different. Anyway, a phase-to-phase short circuit is wrong. Generally, a multimeter is used to measure the resistance on one side. If you change the test leads, it will be infinity. In fact, this is a single-phase DC solenoid valve. Most of them are like this. Sometimes the protection circuit is in In the junction box of the solenoid valve, there are various ways of connecting the diodes, including series connection and bridge rectification.

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