Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 134-139.doi: 10.13475/j.fzxb.20180705606

• Machinery & Accessories • Previous Articles     Next Articles

Real-time motion control technology of knitting circular machine

DAI Ning, HU Xudong, PENG Laihu()   

  1. The Center for Engineering Technology of Modern Textile Machinery & Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2018-07-23 Revised:2019-09-16 Online:2019-12-15 Published:2019-12-18
  • Contact: PENG Laihu E-mail:laihup@zstu.edu.cn

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Abstract:

Aiming at problems of existing knitting circular machine, such as easy failure in the operation state switching, unstable speed control and low precision, a motion control design scheme for knitting circular machine based on advanced RISE machine(ARM ) processor was proposed. Combined with the characteristics of various motion states such as running, jogging, forced running and stopping of the knitting circular machine, the control mode and running characteristics of the variable frequency motor were summarized and analyzed. According to the motion control technology of the knitting circular machine, the overall design structure of the scheme was constructed. The key hardware circuit design and motion control algorithm were discussed, and software development was carried out. Three different working states were classified for the inching, running, stopping buttons to acquire the current state of motion required to knitting circular machine at the moment. Analog input was adopted for the variable frequency motor speed control, and pulse width modulation (PWM) was adopted to control the size of its analog input. In order to control the stability of the knitting circular machine's running speed, the voltage fluctuation of PWM analog input was studied at different frequency values, and the most suitable frequency value was selected according to the actual situation. The results indicate that this scheme has high real-time performance and stability, meeting the control requirements of the knitting circular machine.

Key words: knitting circular machine, motion control, hardware circuit, variable frequency motor

CLC Number: 

  • TS103.7

Fig.1

Mechanical structure diagram of knitting circular machine"

Fig.2

General structure diagram of motion control technology of knitting circular machine"

Fig.3

Circuit diagram of status detection"

Fig.4

Circuit diagram of motion control. (a) Control circuit of PWM; (b) Control circuit of enable signal"

Fig.5

Flow chart of status detection program"

Fig.6

Program flow chart of variable frequency motor speed control"

Fig.7

Waveform of PWM at low (a) and high (b) frequency"

Fig.8

Back-end waveform of converter control circuit. (a) Low frequency; (b) High frequency"

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