The basic structure of a car central locking system consists of two parts: the control part and the actuator.

1. Control section: includes encoder, input device, memory, discriminator, driver, anti-interference circuit, display, alarm, safety device, and power supply.

2. The actuator is generally controlled by electromagnets or micro motors.

Introduction to the central locking actuator:

1. DC motor type: It rotates through a DC motor and transmits power to the door lock buckle through a transmission device (including screw transmission, rack transmission, and spur gear transmission) to open or lock the door lock buckle. Due to the bidirectional rotation of DC motors, the locking or opening of door locks is achieved through the forward and reverse rotation of the motor. Compared to electromagnetic actuators, this type of actuator consumes less power.

2. Electromagnetic type: It has two coils inside, which are used to open and lock the door lock, and the door lock centralized operation button is usually in the middle position. When a positive current is applied to the lock door coil, the armature drives the rod to move left, and the door is locked; When reverse current is applied to the door coil, the armature drives the connecting rod to move to the right, and the door is opened.

3. Electric motor type: Its function is basically the same as the previous two types, with significant structural differences. The rotor has convex teeth, and the radial clearance between the convex teeth and the stator magnetic poles is small while the magnetic flux is large. The stator is equipped with multiple electromagnetic poles uniformly distributed in the axial direction, and each electromagnetic coil is arranged radially. The stator is surrounded by iron cores, each with coils wound around it. When current passes through a coil of a certain phase, the iron core of that coil generates suction force to attract the convex teeth on the rotor to align with the magnetic poles of the stator coil. The rotor will rotate to a small magnetic flux position, which is a step position. To continue rotating the rotor by one step angle, input a pulse current to the stator coil of the next phase according to the required rotation direction, and the rotor can rotate. When the rotor rotates, the door lock is locked or opened through connection.