Stepper motor of the PLC control directly

Stepper motor direct control of PLC in dalian institute for nationalities GuanLiNa Kang Jing k siu welcome to e exhibition hall 1 motor exhibition hall three-phase asynchronous motor, single-phase motor, motor, servo motor, dc motor,. 。 。 Programmable controller directly control of step motor, can make the cost of the control system of modular machine tool automatic production line dropped significantly. This paper introduces the use of PLC control stepping motor drive method of numerical control slider step motor servo control, drive and the interface software of PLC control logic. 1 overview in combination machine tools automatic line, generally according to the requirements of the different machining precision set three sliding table ( 1) Hydraulic sliding table, used for cutting large amount, low machining accuracy requirement of roughing process; （ 2) Mechanical sliding table, used for cutting the amount of medium, has certain precision requirements of the half finish machining process; （ 3) Small amount of nc sliding table, used for cutting and machining accuracy demanding finishing process. Programmable controller ( Hereinafter referred to as PLC controller) With its strong commonality, high reliability, simple instruction system, programming is simple to learn, easy to master, small size, less maintenance work, the scene interface convenient installation and a series of advantages, is widely used in industrial automatic control. Especially in combination machine tools automatic production line control and S, T, M function of CNC machine tool control more show its excellent performance. PLC control of stepping motor open loop servo mechanism used in modular machine tool nc ramp control on automatic production line, can save the unit of nc system to reduce the unit cost of the control system of 70 ~ 90%, or even take up automatic line PLC controller control unit only 3 ~ 5 I/O interface and 4, for large production line should be fully considered. Using hardware circular distributor, although a few complex hardware structure, but can save take up PLC I/O points, the market has a variety of special chip can be chosen. Stepper motor drive control of the PLC output pulse power amplifier to dozens to hundreds of volts, several Ann ~ 10 Ann driving ability. General PLC output interface has certain ability to drive, and usually the transistor load capacity of the dc output interface is only 10 ~ a few volts, dozens to hundreds of ma. But for stepper motor power requires dozens to hundreds of volts, several Ann ~ 10 Ann's ability to drive, so drive on output pulse amplification should be used. 5. Two programmable controller hardware interface such as servo mechanism adopts circular distributor, the take up of PLC I/O points less than 5 points, generally for only 3 points. Which I take up a little, as the start control signal; O take up 2 points, as PLC pulse output interface, hard ring connected to the servo system of the clock pulse input, another point as a stepping motor to control signals, to the phase sequence of hard ring distribution control side, as shown in figure 3. Servo system using software circular distributor, its interface is shown in figure 4. 6 examples of application and conclusion will open loop servo mechanism of PLC controller control used in a large production line of CNC sliding table, each slide only occupy four I/O interface, save the CNC control system, the pulse equivalent to zero. 01 ~ 0. 5 mm, feed speed of Vf = 3 ~ 15 m/min, fully meet the technological requirements and processing precision requirements.
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