针织大圆机运动实时控制技术

针对现有针织大圆机运转状态模式切换易出错、速度控制不稳定且精度较低等问题,提出一种基于ARM处理器的针织大圆机运动控制设计方案。结合针织大圆机运行、点动、强迫运行、停止等多种运动状态的特点,归纳分析了变频电动机的控制方式和运转特性。根据针织大圆机运动控制工艺,构建了本方案的总体设计架构,论述了关键硬件电路设计与运动控制算法,并进行软件开发。对点动、运行、停止3个按钮不同的工作状态进行分类,得出当前时刻针织大圆机所需的运动状态。对变频电动机采用模拟量输入进行速度控制,并采用脉冲宽度调制(PWM)控制其模拟量输入的大小。为控制针织大圆机运转速度的稳定性,研究PWM在不同频率值下模拟量输入的电压波动情况,结合实际情况选择最合适的频率值。测试结果表明,该方案具有较高的实时性及稳定性,满足针织大圆机的控制要求。

Real-time motion control technology of knitting circular machine

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.