Magnet Interaction

Introduction

Magnet interaction is the primary use for a reed switch in a sensing application. In other words, pairing a permanent magnet with a reed switch is referred to as a里德传感器. Likewise, reed switch actuation mostly occurs using a permanent magnet as the actuator. The magnet is always the moving object in the sensing area. However, thereed switchis in a fixed position.

Additionally, it is important to understand how a sensor operates using magnet interaction. Reed sensors work in one of four contact states.

Switch Contact States

1. Normally Open (Form A)- 通常开放状态是触点处于打开模式的地方。这reed switch consumes no power in the open state.
2. Normally Closed (Form B)– A normally closed contact state refers to the switch contacts resting in a closed position.
3. Changeover (Form C)–Changeover当正常的触点在正常打开的接触断裂或关闭之前打开或打开时，就会发生。
4. Latching / Bistable (Form E)– A latching or bistable mode is a more advanced use for the sensor. The contacts can either be in a closed or open state. The methods used depends on the actual application. A permanent magnet is used to change the contact state by reversing the magnetic polarity.

Before we explore each of these ways, it is important to understand the switch magnetic fields. Various magnet positions and movement will cause the reed switch’s on/off domain to change. Furthermore, the actual closure and opening points will vary considerably for different Reed switches and magnet sizes and strengths.

这below reed switch actuation examples show a small sample of sensing applications. These examples mainly focus on using normally open and normally closed contact applications.