Permanent magnet driving technology and its application status in the field of mining equipment

Mining equipments are mostly operated in extreme environments with heavy load, humidity and explosion-proof conditions. The traditional driving system of mining equipment usually adopts the AC asynchronous motor drive technology, the equipment often runs in the low efficiency working area for the continuous production of the mine, so the degree of intelligence is low, and there is serious power waste. With the development of power electronic technology and modern electric drive control technology, permanent magnet driving technology, as a kind of green intelligent driving technology which uses permanent magnet motors to drive load, has been applied in many fields such as electric vehicle, rail transportation and automatic production, but it is less used in the field of mining equipment and has a broad development prospect. Firstly, compared with the traditional AC and DC motors, the three most commonly used permanent magnet motors for permanent magnet drive are introduced:permanent magnet synchronous motor, permanent magnet brushless DC motor, permanent magnet linear motor. At the same time, according to the characteristics of mining equipment operation conditions, the paper analyzes and compares three common frequency control technologies used in permanent magnet motor, and the advantages of permanent magnet drive technology in the field of mining equipment are highlighted. On this basis, the application and research status of permanent magnet driving technology in mining and tunneling equipment, mine transportation and hoisting of mine are analyzed, it is pointed out that:in order to further promote the application of permanent magnet driving technology in the field of mining equipment, the permanent magnet semi-direct drive system can be developed for the heavy load, sudden load and other operating conditions requiring low speed and high torque operation condition of the cutting part of mining equipment and scraper conveyor; the permanent magnet semi-direct driving system should be vigorously developed; With the characteristics of heavy load friction transmission, the full permanent magnet intelligent driving system of“permanent magnet direct drive+permanent magnet tension” can be applied; in order to adapt to the increasing load and lifting depth of the ultra-deep well, the new type of mine hoisting system driven by “wire rope + permanent magnet linear motor”is developed. Finally, the research focus and development direction of permanent magnet driving technology in the field of mining equipment are prospected. It is considered vigorously developing high-reliability permanent magnet driving technology for extreme mining conditions and developing intelligent mining equipment based on permanent magnet driving technology should be main development direction of this field.