型号：3BHL000986P0006
品牌：ABB
衡量伺服系统性能的主要指标有频带宽度和精度。频带宽度简称带宽，由系统频率响应特性来规定，反映伺服系统的跟踪的快速性。带宽越大，快速性越好。伺服系统的带宽主要受控制对象和执行机构的惯性的限制。惯性越大，带宽越窄。一般伺服系统的带宽小于15赫，大型设备伺服系统的带宽则在1～2赫以下。自20世纪70年代以来，由于发展了力矩电机及高灵敏度测速机，使伺服系统实现了直接驱动，革除或减小了齿隙和弹性变形等非线性因素，使带宽达到50赫，并成功应用在远程导弹、人造卫星、精密指挥仪等场所。伺服系统的精度主要决定于所用的测量元件的精度。因此，在伺服系统中必须采用高精度的测量元件，如精密电位器、自整角机、旋转变压器、光电编码器、光栅、磁栅和球栅等。此外，也可采取附加措施来提高系统的精度，例如将测量元件（如自整角机）的测量轴通过减速器与转轴相连，使转轴的转角得到放大，来提高相对测量精度。采用这种方案的伺服系统称为精测粗测系统或双通道系统。通过减速器与转轴啮合的测角线路称精读数通道，直接取自转轴的测角线路称粗读数通道。
The main indexes of measuring servo system performance are frequency band width and precision. The frequency band width, referred to as bandwidth, is defined by the frequency response characteristics of the system and reflects the tracking speed of the servo system. The larger the bandwidth, the better the speed. The bandwidth of servo system is mainly limited by the inertia of control object and actuator. The greater the inertia, the narrower the bandwidth. The bandwidth of general servo system is less than 15 Hz, and the bandwidth of large equipment servo system is less than 1 ~ 2 Hz. Since the 1970s, due to the development of torque motor and high sensitivity speed measuring machine, so that the servo system to achieve direct drive, eliminate or reduce the backlash and elastic deformation and other nonlinear factors, so that the bandwidth up to 50 H, and successfully applied in long-range missiles, satellites, precision director and other places. The precision of servo system mainly depends on the precision of measuring element used. Therefore, high precision measuring components must be used in the servo system, such as precision potentiometer, self-angulation machine, rotary transformer, photoelectric encoder, grating, magnetic grid and ball grid, etc. In addition, additional measures can also be taken to improve the accuracy of the system. For example, the measuring shaft of the measuring element (such as the autofinisher) is connected to the rotating shaft through the reducer, so that the rotation Angle of the rotating shaft can be amplified to improve the relative measurement accuracy. The servo system that adopts this scheme is called fine coarse measuring system or dual channel system. The Angle measuring line meshing with the shaft through the reducer is called the fine reading channel, and the Angle measuring line directly taken from the shaft is called the coarse reading channel.
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