How to measure the quality of electromagnet with multimeter
How to measure the quality of the electromagnet, what is a good method, is it possible to use a multimeter to measure the quality of the electromagnet? By measuring the resistance of the electromagnet coil, to judge whether an electromagnet is good or bad, there are Refer friends who need it.
Multimeter to measure the quality of electromagnet
Generally, a multimeter is used to measure the DC resistance value. Small high-voltage coils are generally hundreds of thousands or a maximum of several megaohms, and the accuracy is not high. The measured value is compared with the design value or other non-faulty equivalent coils. The low-voltage coil is generally at the milliohm level, and the accurate resistance value cannot be measured with a multimeter (the error is very large), and a dedicated direct resistance tester must be used.
However, in the actual measurement, it cannot be said that the measured value is the same or similar to the design value to conclude that the coil is good. Sometimes the insulation between turns or layers of the coil is damaged, which cannot be measured with a multimeter.
You can use the resistance gear measurement instead. First, use a normal electromagnet coil to measure the lower resistance, and then measure the problematic electromagnet coil. When the resistance value is too different, it means that the electromagnet is abnormal.
How to measure the quality of electromagnet with multimeter
Analysis of the problem of measuring the quality of electromagnets:
The problem of the electromagnet: sometimes the suction force is not enough to suck in, sometimes the suction force is too large and the ejection is too slow, sometimes it sucks and sometimes it does not suck, how to measure the electromagnet?
A multimeter can be used to measure the electromagnet, and a multimeter can be used to check the on-off resistance of the coil, so as to judge the quality of the electromagnet.
The parameters of the coil are basically unchanged, and the suction force is determined by the voltage level, the spring force, and the initial position of the iron core.
Focus on checking whether the voltage fluctuates and whether the spring force is within the allowable range.
The initial position of the iron core refers to the distance between the iron core and the bottom of the coil before the electromagnet coil is energized. If the distance is too large, it will not suck.
For the problem that sometimes the suction is too large and the ejection is too slow, too much suction only affects the speed of the iron core sucking in, and it has nothing to do with whether it can be ejected. When the iron core is ejected, the coil is powered off, and the ejection speed is determined by the spring force.
It can be seen that the problem is not in the coil, the problem does not need to be measured with a multimeter.
The above is the method of using a multimeter to measure the quality of the electromagnet, I hope it will be helpful to everyone.
