What Types of Miniature DC Motors Can Electronic Locks Use?

Introduction: Electronic lock DC motors need to have speed reduction and torque enhancement functions. Their main structure consists of a miniature DC motor and a gear reduction device. Common drive motors include brushed DC motors, brushless DC motors, and coreless motors.

Electronic locks control the locking and unlocking operations by rotating the lock tongue via a DC motor. So, what types of DC motors do electronic locks use? Below is a brief introduction.

Electronic lock DC motors need to have speed reduction and torque enhancement functions. Their main structure consists of a miniature DC motor and a gear reduction device. Common drive motors include brushed DC motors, brushless DC motors, and coreless motors. Some electronic locks also use stepper motors. Common speed reduction devices include planetary gearboxes, metal gearboxes, or other types of non-standard gear reduction structures. Electronic lock drive motors have the following performance characteristics:

▍Brushed DC Motors

Brushed DC motors are widely used in electronic locks. The stator of a brushed motor has fixed main magnetic poles and brushes, while the rotor has armature windings and a commutator. DC power enters the armature winding through brushes and a commutator, generating armature current. The magnetic field generated by the armature current interacts with the main magnetic field to produce electromagnetic torque, causing the motor to rotate and drive the load. It has the advantages of convenient and simple speed regulation and low cost.

▍DC Brushless Motor

Similar to brushed motors, brushless motors are motors without brushes and commutators (or slip rings), also known as commutatorless motors. Brushless motors possess the advantages of traditional DC motors while eliminating carbon brushes and slip rings. They are small in size, light in weight, have high output power, excellent torque characteristics, good torque performance at medium and low speeds, high starting torque, and low starting current. However, speed regulation is more complex, and the cost is higher.

▍Coreless DC Motor

Coreless motors have the advantages of small size, high efficiency, rapid starting and braking, and extremely fast response. Coreless motors belong to the DC permanent magnet servo and control motor category and can also be classified as micro-motors, which are also a type of DC motor. Coreless motors possess outstanding energy-saving characteristics, sensitive and convenient control features, and stable operation. Even at high speeds, the speed can be easily and sensitively adjusted, exhibiting highly reliable operational stability with minimal speed fluctuations. As a micro-motor, its speed fluctuations are easily controlled. It is widely used in smart locks, electronic locks, and fingerprint locks.