In recent years, the progress and application of the drive technology and control system are obvious to all, and the linear motor promotes the continuous innovation of the machining center structure and the continuous improvement of the performance. The application of linear motors and fast numerical control systems has played a decisive role in increasing the machining center's high speed, high dynamics and high machining accuracy. But at the same time, there are a series of problems that linear motors will have in machining machines, mainly including the following four kinds of problems:
1 heat problem, the linear motor is directly in poor heat dissipation inside the machine, the primary and secondary windings in the process of electromagnetic energy conversion process generated heat, easily make the temperature T increased; and T increases and Will cause the motor winding resistance R increases, when to ensure that the drive force output unchanged, it is necessary to increase its current I, in turn I will increase T in turn, thus forming a vicious cycle of positive feedback process. Also due to the winding of the linear motor, the iron core is stuck on the machine guide rail, the result will seriously lead to thermal deformation of the machine guide.
2 load interference problem. Linear motor drive control can only be closed-loop control. The load on the workbench (workpiece weight, cutting force, etc.) changes, for a stable system is the external interference, if not automatically adjust the system will cause instability and instability.
3. Magnetic isolation and protection issues. The rotating machine's magnetic field is closed, while the linear motor's magnetic field is open, and near the machine table, magnetic materials such as workpieces, chips, and tools are easily attracted to the field, preventing it from working properly. To this end, although the use of electromagnetic than permanent magnet is better, but the magnetic barrier can not be ignored. And also need to consider the machine coolant, lubricants and other protection.
4. Vertical feed in the weight problem. When the linear stepping motor is applied to the vertical feeding mechanism, the problem of self-locking when the linear motor is powered off and the impact of the gravitational acceleration when the power is on must be solved because of the weight of the carriage. To this end, in addition to adding a suitable balance weight block (or hydraulic support), the power to take mechanical self-locking device, you must also take appropriate measures in the servo drive control module.
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Linear motor