Detailed explanation of the principle of magnetic holding relay

Update:01-11-2019
Summary:

The principle of magnetic holding relay (detailed magne […]

The principle of magnetic holding relay (detailed magnetic drive relay drive circuit diagram and wiring method), there are many classifications of relays, but the principle of most relays is the same. Compared with ordinary electromagnetic relays, magnetic retention relays have the advantage of low power consumption. When the coil is energized, it consumes some electric energy. After the trigger pulse disappears, the relay is kept in the original state by its internal permanent magnet. What we are going to say below is the principle of the magnetic holding relay.
The normally closed or normally open state of the magnetic holding relay is completely dependent on the permanent magnet, and the switching of the switching state is accomplished by triggering a pulsed electrical signal of a certain width.
The magnetic holding relay is generally composed of a core, a coil, an armature, a contact spring, and the like. As long as a certain voltage is applied to both ends of the coil, a certain current flows in the coil, thereby generating an electromagnetic effect, and the armature will overcome the pulling force of the return spring to attract the iron core under the action principle and the attraction of the characteristic electromagnetic force. Thereby, the movable contact of the armature is brought into contact with the stationary contact (normally open contact).
When the coil is de-energized, the electromagnetic suction will also disappear, and the armature will return to the working principle in the reaction force of the spring. The original position of the characteristic will make the moving contact and the original static contact (normally closed contact). This is sucked and released, thereby achieving the purpose of turning on and off in the circuit. For the "normally open, normally closed" contacts of the magnetic holding relay, it can be distinguished as follows: a static contact that is in an open state when the relay coil is not energized, called a "normally open contact"; a static touch that is in an on state The point is called "normally closed contact".
When the input amount (such as voltage, current, temperature, etc.) reaches the specified value, the electrical circuit that is controlled by the operating principle and characteristic control is turned on or off. It can be divided into electrical quantity (such as current, voltage, frequency, power, etc.) relay and non-electrical quantity (such as temperature, pressure, speed, etc.) magnetic holding relay two categories.