Magnetic holding relay principle

Photocoupler

Guide: The relay is essentially an automatic switching component, which has many functions such as expanding the control range, completing the isolation function, and realizing automatic monitoring. It has been widely used in various fields such as automatic control, remote control, and communication. So the question is, what kind of magnetic latching relay is a relay? This article will latching relay is described in detail in all aspects ~~

First, the principle of magnetic holding relay - - Introduction

The magnetic holding relay is also a kind of relay, but it has more stable performance than other relays, and has a smaller volume and a stronger bearing capacity. The magnetic holding relay is essentially an automatic switch that can automatically turn the circuit on or off. It usually maintains a stable state by the magnetism of the permanent magnet. If it needs to be converted, it can be excited by using a pulse signal.

Second, the principle of magnetic holding relay

The contact of the magnetic holding relay is in a stable state due to the magnetic force of the permanent magnet. If it is necessary to switch the switching state of the contact, it is only necessary to apply a DC pulse voltage to the coil. Figure 1-4 shows the transition of the magnetic holding relay from the "reset" state to the "set" state. Figure 1 shows the reset state of the magnetic holding relay. In Figure 2, the coil J2 is straightened. The pulse voltage is generated; since the magnetic pole excited by the coil J2 interacts with the magnetic pole of the permanent magnet, the same polarity repels and the opposite sex attracts, so the state shown in FIG. 3 is generated; in FIG. 4, the pulse disappears and the relay is completed by " Resets the transition from the "state" to the "set" state.

Figure 1 Magnetic holding relay reset state

Figure 2 DC pulse voltage applied to coil J2

Figure 3 Interaction between magnetic poles

Figure 4 Magnetic Hold Relay Set Status

Third, the principle of magnetic holding relay - - contact form

A rectangular frame is used in the circuit to indicate the coil of the relay, with the symbol "J" on the side. The contacts of the relay have two expressions in the circuit: one is to draw the contacts on one side of the rectangular frame, and the other is to draw the contacts in their respective control circuits and mark them with text symbols. the difference.

Fourth, the principle of magnetic holding relay - - selection

There are three factors to consider in the selection of magnetic holding relays. The first is whether the current and voltage provided by the control circuit meet the requirements of the relay for voltage and current. The second is to need several sets and types of contacts, considering whether the size of the existing relay is suitable; the third is to consider the volume of the appliance. Consider the installation and layout of the board.

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