What are the application scenarios of smaller sintered ferrite magnets in smart door locks?

Door status detection: Used in conjunction with a magnetoresistive sensor, the sintered ferrite magnet is installed on the door or door frame, and the magnetoresistive sensor is installed in the corresponding position. When the door is closed, the magnet is close to the magnetoresistance sensor, so that it can detect the magnetic field change, so as to judge the door is closed; When the door is opened, the magnetic field changes, and the sensor senses and feedbacks the door has been opened signal, providing the user with accurate information about the door switching state.

Action detection: Used to detect the action of smart door lock handles, slides and other components. For example, the small size sintered ferrite magnet is installed on the handle, the Hall sensor is installed near the handle, when the user turns the handle, the magnetic field between the magnet and the sensor changes, the sensor captures the signal, and the intelligent door lock system is triggered for corresponding processing, such as wake-up system, ready to unlock.

Latch control: As part of the electromagnetic drive system, control the expansion and contraction of the latch. When the smart door lock receives the unlocking instruction, it generates a magnetic field through the electromagnetic coil, interacts with the sintered ferrite magnet, and generates a force that retract the lock tongue to realize the unlocking action; When locking the door, the electromagnetic force and the magnet make the lock tongue out and insert the door frame lock hole to complete the door locking operation.

Clutch control: In the clutch mechanism of some smart door locks, sintered ferrite magnets can be used to control the combination and separation of the clutch. Through the electromagnetic drive to change the magnetic field state of the magnet, and then control the position of the clutch parts, to achieve the power connection or disconnection between the motor and the lock core, to ensure the accuracy and safety of power transmission under different unlocking methods.

NFC signal enhancement: Cooperate with NFC module to enhance the transmission and reception effect of NFC signal. The small size sintered ferrite magnet can be installed near the NFC antenna, using its magnetic characteristics to optimize the magnetic field distribution of the antenna, improve the strength and stability of the NFC signal, so that the smart door lock can complete the data transmission more quickly and accurately when interacting with NFC devices such as mobile phones, and achieve functions such as contactless unlocking.

Anti-interference shielding: used to make anti-interference shielding layer to reduce the influence of external electromagnetic interference on the internal circuit and signal transmission of intelligent door locks. The sintered ferrite magnet is made into a sheet or shielding cover, wrapped around the key electronic components or lines of the smart door lock, and its magnetism can block or absorb external electromagnetic interference signals, ensure the stable operation of the smart door lock system, and prevent misoperation or failure caused by electromagnetic interference.

The above is the content of Xiaobian collation, hope to help you!