Title: Analysis of current and power factor of three-phase motor - take "4.5hpka3phasemotorcurrent3" as an example In the process of purchasing and using motors, it often involves the concept and application of related terms such as three-phase motor current and power, and this article mainly focuses on these contents with a case analysis, and the title is "about 'three-phase motor power factor, current and selection considerations' - taking '4.5hpka3phasemotorcurrent3' as an example". 1. The concept and characteristics of three-phase motors Three-phase motor is one of the most widely used types of motors in the power system, which uses three-phase AC power supply for power supply, and has the advantages of simple structure, stable operation and high efficiency. Three-phase motors are widely used in industry, agriculture and other fields. In practical applications, the power of the motor determines the operating efficiency of the motor and the load that can be driven. The current of the motor is directly related to the operation safety of the motor. Therefore, when selecting and using a three-phase motor, parameters such as power and current of the motor must be taken into account. 2. Case analysis of "4.5hpka3phasemotorcurrent3". In this example, "4.5hpka3phasemotor" means a three-phase motor with a power rating of 4.5 horsepower (hp), and "current3" indicates that the motor uses current class 3. This means that the matching three-phase power supply and the corresponding electrical components such as cables and circuit breakers need to be considered when selecting the motor. In practical applications, the current during the operation of the motor should be kept within the rated current range to ensure the normal operation and service life of the motor. Therefore, when selecting a three-phase motor, it is necessary to fully consider factors such as the power and current level of the motor and the actual demand scenario. On the premise of meeting the needs, choose the most cost-effective and economical model. In practical applications, attention should be paid to the operation status of the motor, and regular maintenance and overhaul should be carried out to ensure the normal operation and safe use of the motor. In addition, it is also necessary to pay attention to the influence of the use environment of the motor, such as temperature, humidity and other factors on the performance and life of the motor, and create a good use environment as much as possible to ensure the performance and life of the motor, and at the same time deal with abnormal situations in time to avoid the occurrence of failures and the increase of maintenance costs. In the process of installation and use of the motor, it is also necessary to pay attention to the correct wiring and voltage adjustment to ensure the safe and reliable operation of the motor, meet the load demand, and also ensure the personal safety and maintenance convenience of the operator, improve the efficiency of equipment use and production efficiency, and promote the sustainable development of enterprises and the progress of economic construction. Summary: Through the analysis and discussion of this article, we understand the characteristics and important concepts of three-phase motors, and also understand the important factors and points that need to be paid attention to when purchasing and using three-phase motors, in addition, we realize that the reasonable selection and use of three-phase motors has an important impact on the improvement of production efficiency and the reduction of maintenance costs, so we should continue to improve our skills and knowledge level in the future work and study, strengthen the scientific selection and use of motors, ensure the production efficiency and safe operation of enterprises, and promote the sustainable development of the economy。 At the same time, we should also pay attention to the application of new technologies and new materials, promote the continuous progress and innovation of three-phase motor technology, so as to meet the development needs of the future society and make greater contributions to China's modernization.