What is the structure and main parameters of the electromagnetic relay?
1.The structure of the electromagnetic relay.
The electromagnetic relay is an electronic control device, which is mainly composed of a core, a coil, an armature, a contact, a reed, etc.
In fact, it is a kind of " automatic switch " that can control larger current and higher voltage with a smaller current and lower voltage. As long as there is a certain voltage on both ends of the coil, there is a certain current flowing in the coil, and the core will generate a magnetic field, which produces a strong electromagnetic force, the sucking armature drives the reed to make the contact action on the reed. When the coil is powered off, the core loses magnetism, and the electromagnetic force disappears. The armature will leave the core, because of the elastic effect of the reed, when the armature oppresses the reed contact, the contact will be disconnected.
2.The main parameters of the electromagnetic relay.
( 1 ) Rated operating voltage ( or rated operating current ) It refers to the voltage applied to both ends of the coil ( or the current flowing through the coil ) when the relay works reliably. The voltage or current applied to both ends of the coil should not exceed this value.
( 2 ) DC resistance which refers to the DC resistance of the relay coil. The relationship between the rated voltage U, the rated current I, and the DC resistance R is : R = U / I, if the DC resistanceis known, the rated voltage U can be obtained according to Ohm's law by the rated current I.
( 3 ) Suction voltage ( or current ) which refers to the minimum voltage ( or current ) that the relay can produce in a pull-in action. If only the relay coil is coupled with the suction voltage, the pull-in action is not reliable, because the voltage slightly fluctuates the relay may return to the original state. In practical use, to make the relay reliable suction, the added voltage can be slightly higher than the rated voltage, but generally not greater than the rated operating voltage of 1.5 times, otherwise, the coil is easy to burn down.
( 4 ) Release voltage ( or current ) The maximum voltage ( or current ) that is allowed to remain at both ends of the coil when the relay is restored in situ by the suction state. In use, the residual voltage ( or current ) of the control circuit when releasing the relay must be less than the release voltage ( or current ), otherwise the relay will not be able to be reliably released.
( 5 ) Contact load It means the voltage applied by the relay contact and the passing current. It determines the ability of the relay to control the magnitude of voltage and current. When in use, you can not control high voltage or high current with the relay with small contact load.
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