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Current positionHome > News Use the attention of the linear motor

Use the attention of the linear motor

time2017-8-25  click1640

  Linear motor feed system has a wide range of advantages because of its simple structure, fast response, high sensitivity, good followability, good sealing, not afraid of pollution, strong adaptability, stable and reliable operation, long life and so on. Application prospects. But must also be noted that the linear motor itself has some problems are not well resolved in the machine feed system using linear motor, to avoid weaknesses, comprehensive analysis, give full play to the superiority of linear motor. We in the linear motor design, manufacture, control, assembly process to solve the following aspects of the problem.
  Compared with the same capacity rotary motor, linear motor efficiency and power factor to be low, especially at low speed is more obvious. This question should be considered in two ways. On the one hand, as a linear motor servo feed system, due to eliminating the need for intermediate mechanical transmission links, can greatly reduce the mechanical friction and the elastic deformation of the system, its movement quality, motion inertia is also reduced, so that the energy loss is greatly reduced, So that the overall efficiency of the system than the use of rotating electrical system efficiency is even higher. On the other hand, in the design and manufacture of linear motors, various measures should be taken to improve the performance of      linear motors, with particular attention to reduce the effect of end effects.
  Linear motor itself because the structure is simple, the cooling effect is still relatively good. However, when the linear motor is used for machine tools, because it is usually only installed in the machine, cooling is more difficult, and the linear motor winding, the core is near the machine tool guide, will seriously cause the machine tool rail thermal deformation, After the system is driven by a linear motor, it is sometimes necessary to take cooling measures such as air cooling or circulating water cooling.
  Linear motor in addition to produce parallel to the direction of motion of the electromagnetic thrust, but also in the primary and secondary to produce a vertical direction perpendicular to the feed direction of the magnetic force, in the machine structure design, we must take into account the normal magnetic suction. In order to ensure smooth thrust, linear motor layout should be made as a symmetrical structure. It is also possible to combine the primary and secondary of the linear motor with the guide rail of the machine tool, and make use of the normal magnetic flux between the primary and secondary to realize the magnetic levitation guide without mechanical contact.
  Although the linear motor feed system eliminates the influence of the elasticity, gap, friction and other factors on the system accuracy of the intermediate transmission mechanism, the linear motor drive control can only use the fully closed loop control, which makes all kinds of interference without any intermediate links Decay and directly spread to the linear motor, increased the difficulty of servo control. The use of software and microelectronic devices to replace mechanical components is likely to achieve higher performance and economic benefits. In order to better solve the problem of linear motor control, the research results in recent years can be divided into two aspects: First, the use of vector control technology, frequency converter, PID controller has mature control technology; Control theory and control technology of linear motor. With the development of automatic control technology and microcomputer technology, linear motor control methods will be more and more. However, in the high-speed, precision machine tool feed system widely used linear motor, there are still many work in the control to do.
  Since the magnetic field of the linear motor is open, especially the synchronous linear motor to install a row of rows of magnetic permanent magnets, and the workpiece, bed and tools are magnetic materials, it is easy to be linear motor Magnetic field suction, so that assembly work is difficult to carry out. In particular, the magnetic dust and magnetic dust in the air are sucked into the air gap between the primary and the secondary of the linear motor, and the motor can not work. Therefore, in the machine feed system, regardless of the use of synchronous or induction linear motor, should take effective magnetic protection measures.

  When the linear motor is applied to the vertical feed mechanism, it is necessary to solve the self-locking problem when the linear motor is powered off and the influence of the gravity acceleration on the power supply. This problem is more complex, not simply add a balanced counterweight can be resolved, must be in the motor and servo drive control module to take appropriate measures.
  The starting thrust of linear motors, especially linear induction motors, is greatly influenced by the supply voltage. Therefore, it is necessary to take measures to ensure the stability of the power supply or to change the relevant characteristics of the motor to reduce or eliminate such effects.
  Linear motors have many of the superior performance that rotating motors do not have, not only for use in rotating electric machines, but also for the inability of rotating motors. With the further development of linear motor theory and technology, linear motor applications in the machine will be more and more widely.
  Kunshan Tongmao Electronics Co., Ltd. (www.tmmotion.com/english/index.asp) production of linear motor quality and dynamic performance reached the international advanced level, 70% of products sold to Europe and the United States and other developed countries such as Germany, the United States, the Netherlands, Malaysia and so on. We believe that with the rise of China's industry, our domestic users will be more and more.