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Magnetic Sensors - Switches (Solid State)

Modern industries and various manufacturing processes rely on effective and reliable sensors that can detect changes in magnetism. Magnetic sensors, one of the oldest detection methods, are still widely used. In general, these sensors use a switchable magnetic field to detect changes in certain physical parameters. The AH1883-FJG-7 magnetic sensor-switch is a reliable and cost effective solution for detecting magnetic fields.

Design Overview of AH1883-FJG-7

The AH1883-FJG-7 is a solid-state magnetic switch designed to detect changes in magnetism and trigger an action. The middle of the sensor contains a ferromagnetic core surrounded by two coils, a reference coil and a drive coil. The reference coil is a closed circuit containing a small current that creates a magnetic field known as a reference field. The drive coil consists of an open circuit connected to an external AC signal, producing a magnetic field known as an excitation field. During normal operation, the relatively weak reference field prevents the excitation field from inducing a voltage in the drive coil. When the external magnetic field from a moving target passes through the sensor, the excitation field is reinforced, thus creating a shift in the position of the core. This shift creates an imbalance between the reference and excitation fields, resulting in a voltage spike detected by the drive coil.

The AH1883-FJG-7 can be designed to detect a wide range of magnetism, from a very weak field to a very strong one. The typical response of the switch is 0.2ms, and the maximum output current is 1A at 15V. Because the switch does not require any contact with the moving target, it is suitable for use in locations that would normally cause wear and tear or create a fire hazard. Additionally, the small size and relatively low power consumption of the switch make it a popular choice for applications in vehicles and systems.

Application and Working Principles of AH1883-FJG-7

The AH1883-FJG-7 can be used in a wide variety of applications such as rotor speed sensing, position sensing, speed detection, current and voltage detection, and proximity sensing. The most common applications are listed below:

• Rotor speed sensing: The sensor can be used to detect the speed of a rotating shaft or rotor by measuring the frequency of the magnetic field created by the rotation.
• Position sensing: The switch can be used to detect the location of a moving object by detecting the change in the external magnetic field.
• Speed detection: The switch can be used to detect the speed of a moving object by measuring the frequency of the external magnetic field.
• Current and voltage detection: The switch can be used to measure the current or voltage of a circuit by detecting changes in the magnetic field.
• Proximity sensing: The switch can be used to detect the presence of an object by measuring the strength of the external magnetic field.

The AH1883-FJG-7 uses an open-loop magnetic sensor design, meaning that no external circuit or power source is required for the switch to operate. The open-loop design is ideal for applications where a simple and reliable switch is needed. The sensor is triggered when the external magnetic field changes, creating a voltage spike detected by the drive coil. Once the switch is triggered, it can be used to activate other components or circuits. For example, the switch can be used to trigger a relay, a solenoid, or a stepper motor.

The AH1883-FJG-7 is an effective and reliable solution for detecting changes in magnetism. The small size and low power consumption of the sensor make it ideal for applications in vehicles and systems. Additionally, the open-loop design of the switch eliminates the need for external circuits or power sources, making it a cost-effective solution for detecting changes in magnetism.

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