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What are the advantages of AC speed regulating electric locomotive compared with DC speed regulating electric locomotive?
Views: 0 Author: Site Editor Publish Time: 2022-09-27 Origin: Site
1. Compared with DC motor, AC motor has the characteristics of simple structure, small volume, light weight, strong overload capacity and high efficiency; The maintenance cost of DC motor is much higher than that of three-phase asynchronous motor due to the coil on the rotor and the easily worn commutating copper ring and carbon brush;
2. As DC speed regulation is operated with resistors, the power consumption is large. As AC variable frequency speed regulation does not use high energy consuming resistors, the power saving rate can reach 35%. If the electric locomotive is set with regenerative feed braking, the electric energy generated by the motor can be fed back to the battery when the electric locomotive decelerates or goes downhill, which can greatly save electric energy and extend the charging time.
3. The DC drive of the electric locomotive is graded. When driving at a low speed, the driver needs to constantly switch between gear 1 and gear 0 to obtain a slow speed. The AC variable frequency speed regulation is stepless and uniform. The speed and parking are completely controlled by the speed regulating handle, and the driver is allowed to suddenly accelerate to the maximum speed when starting at zero speed, because the frequency rise time of frequency conversion speed regulation can be set by the software.
4. The traction force of AC drive electric locomotive is larger than that of DC drive electric locomotive. The traction force of 7t DC drive electric locomotive is only 13.8KN, while the traction force of 7t AC drive electric locomotive can reach 20KN, which can reach or exceed the traction force of 10t DC drive electric locomotive. As the speed of variable frequency speed regulation increases slowly, the impact between gears is avoided and the service life of gears is extended; When decelerating, it is controlled by the speed regulating handle, and the brake pads do not need to hold the wheels to decelerate, thus reducing the wear of the brake pads.
The mining electric locomotive works in the harsh environment underground. The speed control system is in the state of frequent starting, braking, acceleration and deceleration. It also needs to adapt to the load going up and down the slope and bumpy road conditions. Therefore, the starting torque of the motor is required to be large and the overload capacity is strong. The AC speed regulating system with direct torque control can make the three-phase asynchronous motor reach or exceed the starting torque and traction characteristics of the DC motor, and enhance the starting capacity of the electric locomotive with load.
On October 30, Li Zhenbo, General Manager of Information Technology at Shandong China Coal Group and General Manager of Zhongyun Group, was invited to deliver a keynote presentation at an activity organized by the Teaching and Research Group of the Shandong Province Technical and Vocational Schools Admissions and Employment (Industry-Education Integration) Center. The event brought together 23 technical and vocational schools across the province and focused on innovative integration of artificial intelligence with technical and vocational education, sharing practical achievements from the front lines of industry and jointly exploring new approaches to cultivating versatile digital-skills professionals through school-enterprise collaboration.
Recently, the Zhongmei Zhiren AI system, independently developed by the Intelligent Research Institute of Shandong China Coal Group, has continued to evolve and improve. Drawing on core technologies including large language models (LLMs), retrieval-augmented generation (RAG), AI agent workflow orchestration, multimodal vision, and audio and video generation, it is building a dedicated end-to-end AI platform for China’s industrial and mining supplies sector. The platform uses independently controllable AI technology to support the digital transformation of domestic and international trade and foster new quality productive forces.
Recently, three sets of software independently developed by Shandong China Coal Industry & Mining Supplies Group Co., Ltd. have successfully passed the review of the National Copyright Administration and obtained the Computer Software Copyright Registration Certificates. The three certified achievements are all built-in agent modules of the China Coal Zhiren AI System, namely: China Coal Zhiqing Image Management Tool V1.0, China Coal Construction Machinery Foreign Trade Independent Website System V1.0, and China Coal Mining Machinery Foreign Trade Independent Website System V1.0. This marks the continuous expansion of the ecological layout of the China Coal Zhiren AI System and the further consolidation of self-developed technical barriers.
Shandong China Coal Mining Support Equipment Co., Ltd. was founded in the 1990s with more than 1100 employees. It now has 53 professional companies, 3 Hong Kong companies, 1 British Cayman company and 1 American company. It is a large diversified industrial group integrating intelligent equipment manufacturing, e-commerce, software research and development and intelligent logistics, which is cultivated and supported by the Ministry of industry and information technology, the Ministry of Commerce, the development and Reform Commission, Shandong Province and Jining City.
