Developed a linear motor with Siemens
High-thrust density low-thrust wave linear motor is one of the results. Zhang Chi told reporters that the result reveals the magnetic sinusoidal sinusoidal mechanism of permanent magnet linear motor, and establishes an inter-electrode and tooth-top leakage magnetic analytic model, and proposes to consider the notch. A field-circuit design method that affects and incorporates vector control has invented a two-layer cross-precision cooling linear motor that optimizes end length, winding and core teeth, improving thrust density, reducing thrust fluctuations and temperature rise.
"We have developed a linear motor that is benchmarked with Siemens 1FN3600. It has been applied in the first 8-meter composite machining center in China, with repeatability of 10 microns." Zhang Chi said. This linear motor technology has also been successfully applied to the first domestic 15kW internal combustion linear generator with an efficiency of 37.4%.
High-performance servo rotary motors are another important result of the project team. For many years, the efficiency, accuracy, dynamic response and other performances of domestic servo motors and their drive control systems have been significantly different from those of foreign countries. The servo motors, drives and controllers of high-end equipment mostly rely on imports. China's related strategic planning points out that it is not necessary to break through technical bottlenecks such as servo motors, controllers, sensors and drives, and other systems such as system integration design and manufacturing, break international monopoly and promote the upgrading of intelligent manufacturing industry.
Aiming at this goal, Zhang Chi said that his team proposed a torque motor torque/magnetism minimization and magnetic circuit optimization design method, and constructed a multi-parameter optimization strategy based on numerical analysis, which proposed to change the armature and Magnetic pole parameters, magnetic permeability modulation, etc. to reduce torque fluctuations. These efforts made the stator yoke separation developed by the project team and the torque motor of the HALBACH permanent magnet rotor, the torque density is better than that of the American Kollmorgen motor by nearly 30%, and the air-cooled servo motor for injection molding machine has the advantages of simple structure and easy processing. Combined housing, under the same volume, the temperature rise of the winding is reduced by 34%, and the overload capacity is increased by 22% under the same temperature rise.
At the same time, Zhang Chi said that high-speed and high-precision servo drive control is an important part of the project's results. The method of motion system modal automatic identification and dynamics accurate modeling is proposed, and the vibration generation mechanism and error source of direct drive feed system are proved. Invented a low-cost dual-head measuring system capable of accurately measuring displacement, which solves the problem of high cost of a circular grating or magnetic grid of a turntable having a diameter of more than 0.5 m, and inaccurate measurement of the splicing grating or the magnetic scale displacement.
In addition, the high-speed heavy-duty magnetic floating door machine adopts the internationally-integrated direct design of magnetic levitation and linear motor direct drive, inventing the magnetic levitation direct-drive door machine with the fastest running speed (1.8 m/s) and 1 ton load, solving the door machine. In the case of large stroke and heavy load, the startup is slow, the wear is large, and the service life is short. The double servo drive control of the injection molding machine proposes a dual servo motor composite drive and speed synchronous control method, which solves the problem that the large electric injection molding machine adopts a single motor belt. The system has large inertia, low output torque, and slow dynamic response.
