Hall Speed Sensor Magnet
Hall speed sensor magnet is mainly used in locomotive control system to provide necessary guarantee for vehicle driving safety. Its working principle is that when the rotating mechanism of the sensor rotates under the action of external drive, it will drive the permanent magnet to rotate. The magnetic field passing through the Hall element will produce periodic changes, causing changes in the output voltage of the Hall element. A stable pulse voltage signal is formed through subsequent circuit processing, As the output signal of the vehicle speed sensor.
What magnet is used for speed sensor?
Speed sensor magnet
Generally, injection molding magnets are used for automobile speed sensors, such as injection molding NdFeB multipolar rings, injection molding ferrite multipolar magnetic rings, and sintered ferrite radial multipoles, which are generally 4 or 8 pairs of poles (8 poles and 16 poles). We have produced magnets of these materials.
What specification is used for the speed sensor magnet?
There are many specifications. The magnet materials and magnetic force required by different customer groups are different. such as
1. D25.5 * 6.1 * 5.3/radial externally filled 4-pole, about 550 Gauss
2. Injection molded ferrite D24 * 16 * 5.65/diameter outer 8 poles
3. Radial externally charged 16 pole polished ferrite D16 * 10 * 9
……
Hall Speed Sensor Magnet
A Hall speed sensor magnet is a crucial component used in conjunction with Hall Effect speed sensors to detect motion, speed, and position of ferrous targets. These magnets are typically made from materials like AlNiCo or SmCo, which provide a stable magnetic field necessary for the operation of the sensor. When a ferrous object, such as a gear tooth, passes near the Hall Effect sensor, it alters the magnetic field around the sensor. This change is detected by the Hall Effect chip within the sensor, which generates a digital output signal indicating that motion has occurred.
How Hall Speed Sensors Work
Basic Principle: The Hall Effect principle states that when a magnetic field is applied perpendicular to an electric current flowing through a conductor, it produces a voltage (Hall voltage) across the conductor. This voltage can be measured and used to determine the presence or absence of a magnetic field.
Components: A typical Hall Effect speed sensor consists of:
Hall Effect Chip: Detects changes in the magnetic field.
Magnet: Provides a stable magnetic field.
Housing: Protects internal components and allows for mounting.
Operation:
As a ferrous target (like a gear tooth) rotates past the sensor, it disrupts the magnetic field created by the magnet.
This disruption causes the Hall Effect chip to generate an electrical signal (a square wave), which can be interpreted as speed or position data.
Types of Magnets Used
AlNiCo Magnets: Known for their high temperature resistance and stability over time. They are often used in applications where consistent performance is required.
SmCo Magnets: These are rare-earth magnets that offer higher energy density than AlNiCo magnets and perform well in extreme temperatures.
Applications
Hall speed sensors with magnets are widely used across various industries:
Automotive: For wheel speed sensing and engine timing applications.
Manufacturing: In conveyor systems to monitor movement and position.
Aerospace: For monitoring rotational speeds in engines and other critical components.
The above is about the speed sensor magnet introduced by MPCO. If you need to evaluate the price, please contact MPCO (in China) for samples. We have many specifications, waiting for your consultation.
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