(5) Feed drive of high-speed and high-precision machining machine tools, mainly using traditional rotary servo motor and precision high-speed ball screw structure. Since the early 1990s, linear motor has been used for direct drive, because it is compared with the traditional structure. There are a series of advantages, the speed is increased by 30 times, the acceleration is increased by 10 times, the maximum is 10g, and the rigidity is increased by 7 times. Of course, direct drive of linear motor also has some shortcomings and problems, such as difficult control, magnetic interference, high cost, etc., but the overall trend of linear motor drive will become more and more important, and it is likely to become the main body of machine feed drive in the future. . Due to the high efficiency, high thrust density and good controllability of the permanent magnet brushless synchronous linear servo motor, although it has high requirements for magnetic shielding and dustproofing and assembly, it has become the mainstream of linear motors for machine tools.
(6) Other areas include armed equipment, robots, aerospace and other micro-motors. These fields of use use a variety of motors, with a wide variety of specifications, such as the US military micro-motors have more than 5,000 varieties, the annual production capacity is only 3 million units. With the development of robots and aerospace industry, the demand for micro-motors will increase and the requirements will increase. Servo-driven motors in these fields have also developed into permanent magnet brushless motors. For example, the United States develops and manufactures military and aerospace micro-electric motor backbone units, Kollmorgen, and has two permanent magnet AC servo motor series. The M series has five. Frame number, 47 varieties, power from 0.54 to 15.7 kW, speed from 900 to 1200 r/min, continuous torque from 0.89 to 115 N•m, peak torque from 2.41 to 326.8 N•m; MT series has four bases No. 24 varieties, power from 0.231 to 6.7 kW, speed from 1500 to 6000 r/min, continuous torque from 0.44 to 46.8 N•m, peak torque from 1.25 to 115.4 N•m. Compared with the M series, the MT series products are smaller, more efficient, have smaller moment of inertia, and the wiring plug can be rotated, further improving the speed, miniaturization, reliability and maintainability of weapon equipment, and satisfying the servo control system of the military equipment. The requirements are widely used in radar, aerospace and other fields. The United States has used permanent magnet brushless motors for armored vehicles as a driving source instead of brushed DC motors to improve the performance of armored vehicles. The motors of Germany's Siemens and Finland's ABB are rated at 3,820kW, rated at 2800V, and rated at 135r/min. They are used in luxury cruise ships, icebreakers, engineering vessels and other pod propellers. They are now being promoted to submarines instead of brushed DC. Electric motor to improve submarine performance.
