Stepper motor is one of the key components in mechatronics products, which is usually used for positioning control and constant speed control. Stepping motor has the characteristics of low inertia, high positioning accuracy, no accumulated error and simple control. Widely used in mechatronics products, such as: CNC machine tools, packaging machinery, computer peripherals, photocopiers, fax machines and so on.
abstract
This paper mainly expounds the advantages of suspension motion control system, and introduces the function, principle and design process of suspension motion control system. Suspension motion control system is one of the important applications in the field of control engineering, and its main goal is to detect the motion state of the controlled object, including path, speed and position. Compared with other control systems, the motion control system has the characteristics of simple system model, single detection algorithm and no complicated nonlinearity and coupling. It is precisely because the motion control system can achieve the precise control requirements of path, running speed, pointing accuracy and repetition accuracy, and has broad application prospects in various control projects, so the motion control system has become a very meaningful research direction in the application field of detection. Through the detection of step monitor by single chip microcomputer, the motor drives the object to move on the inclined board. The control part is mainly based on SST89E52 single chip microcomputer produced by SST company, which realizes the interaction with the user when it is merged with 1602LCD screen. By inputting different control commands through the keyboard, the LCD screen can display the set values and running coordinates. In the motor control part, LM324N four-way transmission input and automatic connection electronic components are adopted, and the 42BYG205 stepping monitoring drive circuit is developed to realize the precise control of the motor. Some algorithms will optimize the operating system suitable for single chip microcomputer system for many times, and reduce the computation of microprocessor. Actively completed the movement of the object and moved according to different set paths.
Keywords Wan Ciwang; 1602 LCD； LM324N driving circuit
When choosing a stepping motor, we must first ensure that the output power of the stepping motor is greater than the power required by the load. When choosing power stepping motor, the load torque of mechanical system should be calculated first. The torque-frequency characteristics of the motor can meet the mechanical load and have a certain margin to ensure its reliable operation. In practical work, the load torque at various frequencies must be within the range of moment-frequency characteristic curve. Generally speaking, the motor with a large maximum static torque Mjmax has a large load torque [1].
When choosing a stepping motor, the step angle should match the mechanical system, so as to get the pulse equivalent required by the machine tool. In the process of mechanical transmission, in order to have a smaller pulse equivalent, one can change the lead of the lead screw, and the other can be done by subdivision drive of the stepping motor. But subdivision can only change the resolution, not the accuracy. Accuracy is determined by the inherent characteristics of the motor.
When selecting the power stepping motor, the load inertia of mechanical load and the starting frequency required by the machine tool should be estimated, so that the inertia frequency characteristics of the stepping motor have a certain margin matching, and the highest speed continuous working frequency can meet the needs of the rapid movement of the machine tool.
The suspension motion control system based on single chip microcomputer has the advantages of simple hardware circuit structure, high precision and strong anti-interference ability.
1.2 Project purpose
Cultivate the ability to analyze and solve practical problems by comprehensively applying the knowledge learned in college for four years. Test knowledge in practice, so as to strengthen the combination of theory and practice. Experience the whole process of a scientific research project development, learn the application method of single chip microcomputer development, and exercise the application ability and hands-on ability. The design of this topic is a difficult application system development project based on single chip microcomputer, aiming at cultivating students' innovative spirit and ability. Through this graduation thesis and design, we can test our comprehensive quality and the training effect of professional education, so that we can learn to read and use English documents, read and translate foreign materials, and learn to design reports and papers.
1.3 significance of the project
With the development of society, the progress of science and technology, and the gradual improvement of people's living standards, various automatic control systems convenient for life have begun to enter people's lives, and the automatic door system with single chip microcomputer as the core is one of them. At the same time, it also marks that the field of automatic control has become a member of the digital age [3]. Strong practicality, complete functions and advanced technology make people believe that this is the result of scientific and technological progress. It makes people understand that the development of the digital age will change human life and accelerate the development of science and technology.
Through the research and design of "microcomputer controlled automatic door system", a paper on microcomputer controlled automatic door system is written. This paper mainly introduces the system with single chip microcomputer as the main body, LED dot matrix display chip and stepping motor as the core.
This design mainly adopts SST89E58 as the control core, LED dot matrix display chip, stepping motor, pressure sensor and potentiometer. Give full play to the performance of single chip microcomputer. Its advantages are simple hardware circuit, perfect software function, reliable control system and high cost performance, which has certain use and reference value.
1.4 main problems to be solved
The suspension motion control system based on single chip microcomputer is mainly divided into three parts: one is the input and keyboard display module; The other is the stepping motor drive module; The third is the design of minimum system and output module. The main problems to be solved are:
1. Minimum system hardware design of single chip microcomputer;
2. Design of stepping motor drive module:
3. Software and hardware design of the output part;
4. Main program design;
5. Sketchpad design.
1.5 technical requirements
The motor control system is designed to control the movement of the object on the inclined plate (elevation ≤ 100 degree).
Two pulleys are fixed on a white bottom plate, and two motors (fixed on the plate) control an object to move on the plate through hanging ropes passing through the pulleys, and the movement range is 80cm× 100cm. The shape of the object is not limited, and the mass is greater than100g. Fix a light-colored brush on the object, so that you can draw the movement track on the board when you are moving. Mark the ray coordinate lines with the interval of 1cm on the board (different from the color of the brush), and the origin of rectangular coordinates is in the lower left corner.
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