The speed-to-mode conversion module is a real-time conversion module that converts the instantaneous speed when the motor is decelerated or when the output shaft of the motor rotates to an analog voltage. Its greatest feature is the detection of the instantaneous speed and the real-time transformation. The time lag of this transformation can be guaranteed within 5ms. This conversion effect mainly uses the real-time computing capability and special program algorithm of the single-chip microcomputer. First, the proximity switch or photoelectric sensor converts the detection wheel signal in the mechanical rotation into a voltage pulse signal, which is sent to the module. The input of the module adopts an optocoupler and the signal is converted into a standard through a Schmitt trigger. The square wave, then the one-chip computer each other wave signal carries on the acquisition, the examination and the computation, fully takes into account the continuity of the output and the real-time nature of the transformation in the operation, sends the digital result calculated into the D/A conversion device, transforms the analog voltage After the signal is amplified and output, in order to obtain a more flexible analog voltage, a voltage reference micro-adjustment input is added in particular, and the user can output a self-satisfied real-time voltage curve as required.
Performance
Operating voltage DC 24V
Output control voltage DC 0---5V or 0---10V Follow speed change Auxiliary output voltage DC voltage regulation 5V <30mA
Input signal speed 60 pulses/minute to 7000 pulses/minute
Detection signal DC 10--24V Pulse Micro adjustment 5 mv/time
Speed ​​- mode conversion module parameter calculation method and port description
This module has been successfully applied to intelligent automatic pillow packing machines. In order to be able to adjust the bag length and control the cutting precision, the traditional packaging machine adopts a mechanical continuously variable transmission and a mechanical differential transmission adjustment control method. The intelligent automatic pillow packaging machine adopts two inverters to control the main Motor and membrane motor, the main motor to power the film cutting knife (end sealer) and feeding system, the membrane motor to provide power to the packaging film, color code printed on the packaging film, the ideal operating effect requires cutting knife (end sealing knife) The required bag length is cut out every revolution and can be accurately cut onto the color code of the packaging film. This requires that both motors need to be synchronized in speed and position. We apply this module to detect the instantaneous speed on the main motor deceleration shaft and convert it into an analog voltage. This voltage and the necessary position detection sensor signal in the running system are input to the PLC and added to the special module in the PCL. After the servo module) is processed, it is output to the diaphragm motor inverter to realize stable and synchronous operation of the entire system in speed and position. The intelligent automatic pillow packaging machine adopting this processing method has been continuously operated for more than half a year in large-scale cold food production enterprises such as Yili and Mengniu. The speed-to-analog conversion module has never produced any failure and has stable and reliable operation.
Because the higher price of PLC affects the cost of this method, and the control speed of PLC is slightly slower, the programming requirements for PLC program during high-speed control are relatively high. To solve this problem and reduce the cost, we can convert the The analog voltage is controlled by the single-chip microcomputer. This kind of single-chip microcomputer control system has been successfully developed. Compared with the PLC increase module, the real-time control has been significantly improved, and the new program algorithm that the PLC cannot implement easily has been added. The effect is very satisfactory.
Both of the above methods can achieve a stable operation accuracy of ±2mm for the entire packaging machine and fully meet the technical requirements of the packaging machine. If the accuracy requirement is not required, an ordinary 10K potentiometer can be used instead of a PLC or a single-chip processing system to manually adjust the speed synchronization.
The speed-to-analog conversion module is a key technology in the synchronous system that uses inverters to drive ordinary asynchronous motors. At present, no similar products have been found on the market. We have already applied it for national invention patents and utility model patents. This patent has been preliminary examined. Through and has been disclosed, if you want to further understand the module's technology, you can check with the National Patent Office (invention patent application No. 6; utility model patent application No. 6).
Although the speed-to-mode conversion module has been ideally used in packaging machines, this frequency conversion synchronous control system also has a wide range of application prospects in other industries and can be widely promoted in other industries. We can all together make the frequency conversion synchronous control system more complete and the performance further improve.
references:
1. Xu Aiyu. et al. Microcontroller High-Level Language C51 Windows Environment and Application. Beijing: Electronic Industry Press. 2001
2. He Limin. Advanced Microcontroller Tutorial - Application and Design. Beijing: Aerospace University Press. 2000
3. Wang Furui et al. Design of single-chip computer monitoring and control system. Beijing: Aerospace University Press. 1998
4. Pan Xinmin. et al. Microcomputer Control Technology. Beijing: Publishing House of Electronics Industry. 2003
5. Yu Yongquan. Principles and Applications of Flash Microcontroller. Beijing: Publishing House of Electronics Industry. 1997
About the Author:
Hu Hao (1978-) Male passed the National University of Electronic Science and Technology Self-study examination of electronic technology professional course examinations, college graduates, and now independently operating Kwong Yuen Fung Electronics R & D department, mainly for the development of special industrial control modules.
Contact information:
Zip code: 266031
Address: Unit 703, No.42, Xingyuan Road, Sifang District, Qingdao, China Unit Name: Guangyuanfeng Electronics R&D Department Tel: 3717646 Mobile Phone Email: