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(1) Core controller part: This part is the brain of the system and
the core part of realizing the closed-loop control of the turntable position. This part is mainly used to implement the control algorithm of the system,
collect and process the signals of the position and speed of the turntable, and use advanced control strategies to complete the closed-loop control of the system
to ensure the accuracy of the turntable control system. At the same time, it communicates with the upper computer display console part and
sends the real-time collected turntable information to the upper computer for display.
The turntable control system mainly includes two functional modules: system control module and motor drive module.
The signal in the motor drive module is collected by the detection sensor, and it is transmitted to the control system module for
solution, and compared with the actual given value to obtain the deviation value.
The control algorithm is implemented in the system control module to obtain an output value, which is transmitted to the motor drive module, thus realizing
the closed-loop control of the turntable servo system.
The hardware structure types of the turntable servo system include the following methods:
(1) Servo control system based on single-chip microcomputer controller
This type of system uses a single-chip microcomputer as the main controller of the system, and the external expansion circuit mainly includes PWM waveform
generation circuit, analog-to-digital and digital-to-analog conversion circuits, etc. Because the integration of the single-chip microcomputer itself is very low,
the system hardware design is relatively complex, which increases the product volume and reduces the reliability of the system. Moreover,
due to the influence of the number of bits and computing speed of the single-chip microcomputer, many advanced control algorithms cannot be applied
, so it is not easy to use this solution for high-precision servo systems.
(2) Servo control system based on motion control integrated board
This type of system uses a dedicated motion control chip as the servo control unit, such as LM628, GL1000,
GL2000, etc. These control chips have the advantages of high precision, safety and reliability, and easy system design,
but their disadvantage is that they can only use simple control algorithms.
(3) Servo control system based on DSP controller
DSP controller is also called digital signal processor, among which the 2000 series DSP is specially
produced for the industrial control field. Commonly used ones include TMS320F2811, TMS320F2812, etc. This
series of DSP itself has integrated many commonly used functional modules in servo systems, such as CAN bus controller, QEP circuit, PWM circuit, AD converter, etc., which
brings great convenience
to the design of servo systems .
Moreover, DSP is a 32-bit processor with high precision and fast computing speed, which makes
it possible to realize advanced and complex control algorithms. It is currently widely used in the field of servo control.
Through the above analysis, the TMS320F2812 controller is used in the design to realize
the control of the turntable servo system.
The software in the design mainly includes two parts: DSP control software part and DSP and host computer data
communication software part. The software system running on the control computer is an important subsystem of the turntable servo system
, which is responsible for the management and implementation of tasks, and completes the detection of system performance,
the recording and analysis of experimental data, and the human-computer interaction with the operator. The DSP control software part mainly completes
the real-time collection and solution of the turntable information volume and realizes the control algorithm. The software of the DSP and host computer data communication software
part includes data transmission between DSP and host computer and the development of graphical interface in host computer
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