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The main indicators to measure the performance of the servo control system are system accuracy, stability, response characteristics, and operating frequency, especially in terms of frequency bandwidth and accuracy.
d= Bandwidth, referred to as bandwidth, is defined by the system frequency response characteristics to reflect the tracking speed of the servo system. The larger the bandwidth, the better the speed. The bandwidth of the servo system is mainly limited by the inertia of the control object and the actuator. The greater the inertia, the narrower the bandwidth. Generally, the bandwidth of servo system is smaller than Hertz. The bandwidth of servo system of large equipment is below ~ Hertz. Since the 1990s, due to the development of torque motors and high-sensitivity tachometers, the servo system has been directly driven, eliminating or reducing nonlinear factors such as backlash and elastic deformation. The bandwidth has reached Hz and has been successfully used in long-range missiles, artificial satellites, precision Commanders and other places. The accuracy of the servo system mainly depends on the accuracy of the measuring components used. Therefore, high-precision measuring components such as precision potentiometers, self-aligning machines and resolvers must be used in the servo system. In addition, additional measures can be taken to improve the accuracy of the system. For example, the measuring axis of the measuring element (such as an auto-angle machine) is connected to the rotating shaft through a reducer to amplify the rotation angle of the rotating shaft to improve the relative measurement accuracy. The servo system that adopts this solution is called a precise and rough measurement system or a dual-channel system. The fine reading channel of the angular measuring circuit that meshes with the rotating shaft through the reducer is directly taken from the angular measuring circuit of the rotating shaft, which is called the coarse reading channel.
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--d= - - (.d.///r _d) < - Structural composition
d= There are many structural types of mechatronic servo control systems, but from automatic control From a theoretical perspective, the servo control system generally includes five parts: the execution link of the controlled object of the controller, the detection link and the comparison link. -. --[]
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--d= < - Comparison link
d= The comparison link is to compare the input command signal with the feedback signal of the system to obtain the difference between the output and the input. The deviation signal link is usually implemented by a specialized circuit or computer.
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--d= < - Controller
d= The controller is usually a computer or a D control circuit. Its main task is to transform the deviation signal output by the comparison element to control the actuator. Act as required.
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--d= < - Execution link
d= The function of the execution link is to convert various forms of input energy into mechanical energy to drive the controlled object to work according to the requirements of the control signal. The actuators in mechatronics systems generally refer to various motors or hydraulic and pneumatic servo mechanisms.
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--d= < - Controlled object
d= The mechanical parameters including displacement, velocity, acceleration, force and moment are the controlled objects.
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--d= < - Detection link
d= The detection link refers to a device that can measure the output and convert it into the dimensions required by the comparison link. It generally includes sensors and conversion circuits. .
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