What is the resistance of the 220v AC solenoid valve coil, and how to determine whether the 220v AC solenoid valve is good or bad?

What is the coil resistance of a 220v AC solenoid valve? Whether the coil resistance of an AC solenoid valve is large or small is better, which is determined by the coil ampere-turns and power. 1. The solenoid valve is an actuator that converts electrical energy into magnetic energy, and then converts the magnetic energy into mechanical energy to control the fluid. According to the power source used, solenoid valves are divided into two types: alternating current and direct current. The coil resistance of an AC solenoid valve usually refers to its static (not energized) resistance. After the coil is energized, its impedance is much greater than the resistance due to the inductive reactance of the coil. Therefore, the coil of the AC solenoid valve is shorter and the wire diameter is thicker, so that the internal resistance and heat generation can be reduced after the coil is supplied with alternating current. 2. The power of the AC solenoid valve coil determines the ability of the solenoid valve to switch fluids. Generally, the greater the power, the greater the fluid flow it switches. However, the greater the power, the greater the energy consumption of the control circuit provided to the solenoid valve. Therefore, choosing the appropriate power can achieve the best cost performance. When the AC voltage is constant and the power is constant, according to the law N=U2/Z=I×U (I is the current, U is the AC voltage, N is the coil power, and Z is the inductive reactance), Z inductive reactance is determined. If the inductance is represented by L and the frequency is represented by f, then Z = 2πfL. And L=μ×Ae*N2/l m where: L represents the inductance, μ represents the magnetic permeability of the magnetic core, Ae represents the cross-sectional area of ​​the magnetic core, N represents the number of turns of the coil, and lm represents the magnetic path length of the magnetic core. It can be seen that if the inductive reactance Z remains unchanged, the number of turns of the coil will remain unchanged. 3. The magnetic strength is the product of the coil current and the number of coil turns, which is ampere-turns. The larger the ampere-turn, the greater the magnetic field strength. From this, it can be seen that: ① the greater the current flowing through the coil, the stronger the magnetism;② the more turns the coil has, the stronger the magnetism. Magnetic field strength = magnetic permeability X number of coil turns per unit length X current. It can be seen from the above analysis that when the power of the solenoid valve is determined, the coil current is determined, and the number of ampere turns is proportional to the number of coil turns. Therefore, when the number of turns remains unchanged, the thinner the coil wire diameter, the greater the resistance. However, the greater the internal resistance of the coil, the greater the coil's internal resistance will be, which will cause serious heating of the coil. Therefore, it is not that the bigger the resistance, the better;on the contrary, the thicker the wire diameter, the smaller the resistance, the larger the outer diameter of the coil, the larger the appearance of the solenoid valve, and it is a waste of wire, so it is not recommended. How to determine the quality of a 220v AC solenoid valve? Pneumatic solenoid valves used on pneumatic valves;the coil resistance range is 50 to 140Ω. The coils include 24V DC, 220V AC, or even 12V DC or 110V AC. But for valves, the most commonly used ones are DC 24v. The simplest method is to test the solenoid valve by energizing it. Insert the metal part of the screwdriver into the coil hole. If you feel the screwdriver is sucked, it means the solenoid valve is normal. You can also use a multimeter to measure the resistance between coils. A certain resistance is generally considered normal, and generally does not exceed 150Ω. Infinity indicates an internal open circuit, and a display of 0 indicates a short circuit in the coil. It is best to test both methods at the same time to ensure nothing goes wrong. The solenoid valve will move after being energized, and there will be a weak "buzzing" sound of current. If you touch the coil with your hand, you will feel warm. If there is any problem, it means there is no problem with the coil. If no medium can pass through, it means the valve core is blocked. The above is an introduction to the coil resistance of a 220v AC solenoid valve and how to determine whether a 220v AC solenoid valve is good or bad. If you want to know more relevant information, please log in to www.diancifa.cc to view it.