Stepper motor based on programmable logic controller (PLC) in the application of let-off device

Using programmable controller ( PLC） Produce various stepping pulse drive stepper motor to achieve various control, testing has become common. Stepper motor with low rotor inertia, high positioning accuracy, no cumulative error, simple control and so on, became the one of the main components of industrial automation, especially in precise positioning has been widely used in occasions. But in recent years, people pay more attention to its frequency characteristics. Because things change inhomogeneity, fixed frequency technology is more and more shows its limitations, and frequency conversion technology is well adapted to various random changes in the system. PLC control of stepping motor controller of PLC is widely used in industrial automation field, its function is more and more strong, more and more advanced performance. To coincide with stepper motor control, many PLC controller built-in pulse output function, and set the corresponding control instruction, can well to control stepping motor, figure 1 is a panasonic FP0 - C16T transistor output type PLC output circuit structure. Figure 1 PLC output circuit diagram FP0 - C16T type PLC has two pulse output Y0 and Y1 side, as the control mode is different, there are three forms of pulse output. ( 1) The two pulse output can be used as a two without the single-phase pulse output end of the acceleration and deceleration, the main use of PLS and SPD1 instruction, bounce rate range of 0 hz_10khz, can be continuous output, can form the output pulse, can separate output at the same time. ( 2) Can be used as a variable duty ratio of the two phase continuous pulse output, mainly using PWM control instruction, duty cycle set the range of 0% _100 %. The frequency set range 0. 1 hz_999。 9Hz。 ( 3) Can be a two phase with trapezoidal deceleration pulse output, the main use of PULS and SPD1 command control, frequency range 0 hz_10khz, add and subtract rate 10 hz / 10 ms_10khz / 10 ms, can be continuous output, can output pulse sequence form, here is divided into two kinds of control ways, one is pulse + direction control ( Output pulse Y0, Y1, Y2, Y3 output direction) , is a kind of forward and reverse pulse output ( Y0 the CW pulse output, Y1 CCW pulse output) 。 If use Y0, Y2 for pulse, direction, control, control system is shown in figure 2. If you use Y0 as pulse output, can be accomplished by means of as shown in figure 3 two-phase pulse output. Figure 2 pulses, direction of output tutu 3 double pulse output chart of PLC control of stepping motor in the let-off device application of PLC control of stepping motor frequency conversion features used in loom let off device well solves the problems of uneven warp tension within, make the quality of the products produced a qualitative leap. ( 1) Warp tension signal detection device is detection by detecting the motion of the back rest is beyond the scope of the warp tension wave whether meet the requirements, do not meet the requirements when they control the let-off device shall be adjusted. As shown in figure 4, when the warp tension fluctuation occurs, 2 activities back rest 4 drive tension induction rod 5 swing around the point O. When testing the effective area of 6 into the proximity switch 7, approach switch 7 gives high level signal. With PLC as the core of the controller according to the signals and the spindle position, 13, start the stepper motor to drive warp weaving shaft sent. Proximity switch is 7 'tension detection limit switch. When the warp tension is too large or too small, the test piece of 7 '6 will keep out close to switch, 7' output of high level signal to the controller, the controller will turn off the loom, for manual processing. Main shaft position detection is to control the let-off motion allows time, in order to avoid beating-up, ensure filling can be really matter. The spindle location is close to the same switch non-contact detection. Figure 4 let-off device structure ( 2) Driving system, driving system consists of stepper motor drives, stepper motor, worm gear reducer and weaving shaft parts. Its principle is: the signal is amplified by driving control system sent after processing, driving a stepper motor rotation, and then through the reducer reducer, to drive the weaver, let out the warp. For loom let-off mechanism, the load characteristic is: when the stepper motor is transferred out of warp, the warp tension is not load resistance, but a driving force. So stepper motor output torque smaller, overcome self-locking worm worm gear, weaving shaft can turn. The stepper motor speed may be high, By the weft density) ； When step motor reverse tension of warp, the warp tension is load resistance, step motor to output large driving torque, while the low required stepper motor speed, the output of the stepper motor torque-speed characteristics ( As shown in figure 5 a dotted line) Just to adapt. Therefore, stepper motor is very suitable for this type of servo mechanism of low speed high torque, high speed small torque and the requirement of high precision, the loom is one ideal driving element. Figure 5 loom let off unit load torque figure let-off device USES is 2 DM5676A the 56 series stepper motor. From the Angle of its technical indicators are as follows: step: 1. 8 _; Phase current: 2. 0一个; Holding torque: 1. 35Nm； The static torque: 0. 07Nm； The moment of inertia: 4. * 10-6 5Kgm2。
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