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the principle of magnetic holding relay Nov 07, 2018

1, 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.

2, 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. It perfectly shows the conversion of the magnetic hold relay from the "reset" state to the "set" state.

3, magnetic holding relay principle - - 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.

4, the principle of magnetic holding relay - - select

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.

5, the principle of magnetic holding relay - - role

The relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronics. It is one of the most important control components.

Relays generally have an inductive mechanism (input section) that reflects certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); it has the ability to "pass" and "control" the controlled circuit. The actuator (output portion) of the control unit is disconnected; between the input portion and the output portion of the relay, there is also an intermediate mechanism (drive portion) that couples the input amount, functions, and drives the output portion.