[Abstract] This paper briefly describes the status quo of logistics and its automation, and analyzes and studies the use of linear drives for the automation of packaging logistics, improves the performance of packaging logistics, and meets the needs of application development. Keywords: packaging logistics automation; linear drive transmission systems; applications With the development of productivity, the automation and flexibility of manufacturing, the more prominent the contradiction between the expansion of production scale and backward material flow, the low efficiency of logistics and the high manufacturing and packaging The efficiency is becoming less and less adaptable. People deeply feel that the “oil and water†in the production process is almost dried out, and it is very difficult for the benefit to be raised again. There is great potential in material transportation, storage and removal. Logistics is compared to the third source of profit. At present, we must pay attention to the development of logistics systems. The transformation of the logistics structure, the development of advanced logistics technologies, and the reduction of logistics costs are important measures for market competition. 1 Packaging logistics and its status quo and development Logistics enables the flow of substances (or goods) from suppliers to demanders. Connections for processing, packaging, handling, storage, etc. of materials must pass through logistics. Logistics is the bridge between production, packaging and consumption. Logistics has the role of protecting goods and promoting sales of goods. Packaging and logistics are two important links in the process of production and processing of goods to users. The two are mutually influential and are indispensable. As an economic activity, packaging logistics has formed along with the development of commodity economy. As the economy becomes increasingly global, modern packaging logistics, as a profit source, is receiving increasing attention and is facing unprecedented opportunities for development. The quantity and quality of society's demand for packaging logistics are continuously increasing. The development and research of logistics technology also has internal reasons for the development of logistics. The application of modern logistics technology and means will promote the most reasonable cost of logistics. At present, China's logistics industry has a slow delivery speed; the automation of loading and unloading is low; high-level three-dimensional, automation technology has not been popularized and applied; lack of dedicated storage facilities; logistics operations organization and management are backward, can not meet the requirements of logistics services; packaging standardization , Large-scale, and integrated technologies have yet to be promoted; there is a shortage of logistics professionals. Packaging logistics is responsible for tasks such as transportation, storage, and loading and unloading of materials. It is the link of all links to form an organic whole and is the basis for the continuation of the production process. The traditional logistics equipment is backward, the efficiency is low, the labor intensity of the workers is large, the information is scattered, inaccurate, and the transfer speed is slow. Lagging logistics hamper high-speed production. The logistics must also be adapted accordingly. Therefore, the development of logistics must go through three phases: manual, mechanized and automated. The characteristics of development are: rapid, efficient, and automated logistics equipment; logistics systems generally have fast-paced logistics, complex logistics lines, large amounts of information, and timely requirements; the logistics system is complex in structure, with multiple points, long lines, and wide areas. Large scale. Mechanical systems often play a leading role and are still the main component in today's logistics systems. Linear drive is a new type of drive in mechanical systems. 2 The linear drive technology of logistics 2.1 The linear drive system has gradually produced corresponding logistics machinery and equipment for the circulation of materials. Its technical level is one of the important signs of modern logistics. There are many kinds of logistics machinery, and different properties must be chosen to use scientifically. Transportation operations can use different types of logistics machinery. The most economical, reasonable, applicable and advanced technical equipment should be selected according to the specific conditions. Among the operating mechanisms of conveyors and automation equipment, the most widely used is the linear motion device and the linear motion is the most promising way of direct linear drive. The logistics equipment that is often seen uses rotary motors to convert to linear motion through intermediate devices such as chains, wire ropes, transmission belts, gears, or screw rods. Due to the presence of intermediate devices, there are problems such as large size, low efficiency, and low accuracy. A linear drive (also called a linear motor) is a transmission that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate machinery. Linear drives can be used in a wide range of linear motion applications in logistics, compared to other drive methods: Advantages: a. Does not require any conversion mechanism and directly generate force, simplifies the entire system, to ensure the reliability of the operation and improve the transmission efficiency; b. linear drive components are not affected by the centrifugal force and the inertia of the motor itself, and thus the linear motion Speed ​​can be limited; c. There is no friction other than the movement guide rails, and there is little wear; d. Smooth movement, low noise or no noise; e. Simple structure, fewer parts, small size, good heat dissipation, easy maintenance; f. unlimited travel; g. Wide range of motion speed; h. Acceleration, high speed can be achieved in the shortest time and stroke; i. High movement accuracy. Disadvantages: At high speeds, the required magnetizing current is large, the losses are high, and the efficiency and power factor are interrupted at the primary ends, causing side effects, causing waveform distortion and loss. However, due to the elimination of intermediate links, the total efficiency of the system is still higher than that of the rotary motor drive; the starting thrust force is greatly affected by the power supply voltage, and voltage regulation measures must be taken. 2.2 Linear drive principle The principle of a linear drive is similar to that of a rotary motor. As shown in Fig.1, after three-phase symmetrical sinusoidal currents are injected into the three-phase windings, an air gap magnetic field is generated. When the edge effect caused by both ends breaking is not considered, the magnetic field distribution of the air gap can be seen as a straight line direction. Sine. When the three-phase current changes with time, the air gap magnetic field will move in a straight line according to the A, B, C phase sequence, so this magnetic field is also called a traveling wave magnetic field, and the moving speed of the traveling wave magnetic field Vs (m/s); namely: V1=2fτ (1) Where: τ is the pole distance (m); f is the frequency of the current (Hz). The secondary bar (or plate) will induce electric heating and generate current under the traveling wave magnetic field cutting, while the bar current and air gap magnetic field interact to generate electromagnetic thrust, such as the primary fixed non-varying electromagnetic thrust to make the secondary guide bar smooth. The direction of the traveling magnetic field moves linearly. After swapping any two-phase power cords, the direction of movement of the secondary guides will also be reversed, allowing the linear actuator to move repeatedly. (To be continued)