As the defense of the home entrance, the smart lock is often integrated with the elements of ferrite magnets. In some smart lock designs, ferrite magnets are used to drive the mechanical structure inside the lock body to achieve the conversion of electronic signals to mechanical actions. For example, when the user verifies the identity through the password, fingerprint or mobile phone app, the micro motor in the lock drives the ferrite magnet to move, and then drives the expansion of the lock tongue to complete the action of unlocking or locking. The use of ferrite magnets not only improves the response speed of the lock, but also ensures the stability and safety of the operation, making the family entrance management more intelligent and humane.