Detailed Explanation of Electric Motor Applications in X-ray Baggage Screening Machines

1. Component Composition

X-ray baggage screening machines are widely used in airports, train stations, conference centers, and key institutions to check for prohibited or dangerous items inside luggage. The internal structure consists of several high-precision systems, including:

• Conveyor System: Consists of rollers, conveyor belts, and motor drive modules, used to smoothly transport items to the scanning area.
• X-ray Imaging System: Includes high-voltage X-ray sources, image acquisition modules, and radiation shielding structures.
• Detection Control System: Used to synchronize control of scanning speed, image acquisition, and transmission.
• Image Recognition and Alarm System: Automatically analyzes the acquired images, identifies suspicious items, and triggers visual and auditory alarms.
• Data Management and Communication System: Uploads recognition data to the backend system, enabling information sharing and traceability.
• Channel Anti-clamp Mechanism and Door Curtain System: Ensures the safe passage of baggage and prevents foreign objects from getting stuck.

2. Working Principle

When a passenger’s luggage is placed on the conveyor belt at the entrance, the motor starts and drives the belt at a constant speed, moving the luggage into the X-ray imaging area. The X-ray source emits penetrating rays that pass through the item and are projected onto the detector. The image acquisition system converts the signal into an image and performs analysis. The entire process requires the conveyor motor to maintain extremely stable speed control to ensure the image is clear with no trailing shadows. The system continuously compares the object’s outline and density in the image with the database. If suspicious items are detected, it triggers an alarm and halts the conveyor belt. After the inspection, the conveyor system moves the luggage out of the scanning area.

3. Role of Motors in the System

X-ray baggage screening machines place high demands on motors for precision, low noise, and long service life:

• Smooth and Steady Transport: The conveyor motor needs to run at a stable speed for long periods (typically 0.2m/s~0.5m/s) without causing vibrations that could interfere with image acquisition.
• Quick Start/Stop Response: The system must stop immediately when dangerous items are detected, requiring the motor to have rapid response capabilities to improve safety.
• Low Noise Operation: For environments such as airports and subway stations, low-noise servo systems or geared motors are necessary, with running noise kept below 50dB.
• Strong Anti-interference Capability: X-ray systems generate strong electromagnetic interference, so the motor must have excellent electromagnetic shielding performance to ensure stable operation.
• Compact Integrated Design: Screening equipment requires compactness, so the motor needs to be small and easy to install.
• Long Life and High Reliability: The equipment runs for long periods daily, requiring motors with extended fatigue life and low maintenance cycles.

4. Customized Motor Solutions

To meet the “stable, silent, and precise” operational requirements of X-ray screening machines, we provide the GPG-TL54 series brushless DC motor solution specifically designed for screening applications. This motor series uses high-density winding technology and integrates a Hall position detection module, offering high control accuracy and achieving conveyor speed error control within ±0.5%. Paired with the GPG-MDR60 drum-integrated drive unit, which integrates the motor, drum, and drive control module, the design saves internal space and supports modular installation and quick maintenance.

For environments with strict noise control requirements, the system adopts a brushless silent motor with rubber damping devices, effectively reducing the operating noise to below 45dB. To enhance system safety, the solution also features a brake hold function and soft start/stop logic, ensuring that luggage does not slip or fall during emergency braking. Additionally, to deal with complex electromagnetic interference environments, the motor’s internal wiring uses shielded cables and undergoes multi-stage EMI filtering, ensuring stable operation in high-radiation areas. The system as a whole has passed EN61000 anti-interference certification and is widely used in high-speed trains, subways, exhibition centers, and other scenarios requiring high image clarity and continuous operational stability. This solution has been adopted by many security equipment manufacturers (such as the Chinese Academy of Sciences and Zhongan Co., Ltd.) and proven to be highly stable and reliable in real-world environments.