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How suction change in the process of attaracting

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Q:"Problem students" dc electromagnet suction in the process of attracting is how to change?

A:constant, on the basis of the working voltage, the coil current is constant, in the process of absorption and will not change along with the change of the air gap. So. Allows the operating rate is too high. It in front of the suction and air gap is bigger. Magnetic circuit of the magnetic resistance is bigger also, magnetic flux is smaller. Thus the suction is smaller. After absorption, the air gap is very small, magnetic resistance are also small, magnetic flux, the largest electromagnetic suction.

The above content are according to the students the problems in the practical work of finishing, for your reference, if there is any question, please timely communication, correct.