Efficiency enhancement of the servodrives for machine tools using adaptive pulse width modulation

生产工厂的主要能源消耗者之一是产生运动的部件。现代机床中使用的伺服驱动器通常提供高水平的效率。然而，考虑到机器运行状态的频繁变化，这些设备通常不在其最佳工作点运行。为了减少不利运行状态下的发电损失，提高经济效益，需要将伺服驱动器作为整个生产装置的一部分来考虑。这种整体的方法为运动生成领域提供了相当大的节能可能性。在这个项目中，将使用PWM频率的自适应调节来开发提高机床伺服驱动器能效的方法。其基本思想是将PWM频率调整到机床的当前运行状态，而不会对加工过程的稳定性、质量或动力学产生不利影响。在对控制质量要求较高的工作状态下，以最大可能的PWM频率和最佳可能的控制参数进行操作。然而，在要求较低的工作状态下，可以降低PWM频率并自动适应控制参数，从而降低半导体中的开关损耗。这种方法的结果是显著提高了效率，降低了生产过程中的能源成本。

One of the main energy consumers in production plants are components for motion generation. The servo drives used in modern machine tools generally provide a high level of efficiency. However, considering the frequently changing operating states of the machine, these devices are usually not operated at their optimal working point. In order to reduce the generating losses during unfavorable operating states and improve the economic efficiency, servo drives need to be considered as part of the entire production plant. Such a holistic approach provides the possibility for considerable energy saving in the field of motion generation.Within this project, methods for improving the energy efficiency of servo drives in machine tools will be developed using a self-adaptive adjustment of the PWM frequency. The basic idea is to adjust the PWM frequency to the current operating state of the machine tool without disadvantages in regard to stability, quality or dynamics of the machining process. In operating states with high requirements on the control quality, the operation is carried out with maximum possible PWM frequency and the best possible control parameter set. However, in operating states, in which the requirements are lower, a reduction of the PWM frequency and an automatic adaptation of the control parameters is performed, allowing for a reduction of switching losses in the semiconductors. The consequence of this approach is a significant increase in efficiency and a reduction of the energy cost during production.