Parameter setting of stepping motor driver

by:V&T Technologies     2020-01-10
How to set the parameters of stepper motor driver? Which parameters of stepper motor driver need to be set? How to set the parameters of stepping motor correctly? Stepping Motor manufacturer Rui Te takes you to know about this stepping motor driver parameter setting 1. Sets the subdivision number of the step driver. Generally, the higher the subdivision number, the higher the control resolution. However, too high a subdivision affects the maximum feed speed. Generally speaking, the pulse equivalent of 0 can be considered for mold machine users. 001 mm/P ( At this time, the maximum feed speed is 9600 mm/min)Or 0. 0005 mm/P ( At this time, the maximum feed speed is 4800 mm/min); For users with low precision requirements, the pulse equivalent can be set larger, such as 0. 002 mm/P ( At this time, the maximum feed speed is 19200 mm/min)Or 0. 005 mm/P ( At this time, the maximum feed speed is 48000 mm/min). For two-phase stepping motors, the calculation method of pulse equivalent is as follows: pulse equivalent = lead screw pitch ÷Fine fraction/200. 2. Take-off speed: this parameter corresponds to the take-off frequency of the stepping motor. The so-called take-off frequency is the highest frequency that the stepping motor can directly start without acceleration. Reasonable selection of this parameter can improve the machining efficiency and avoid the low-speed section of the stepping motor with poor motion characteristics; However, if the parameter selection is large, it will cause a stuffy car, so be sure to leave a margin. The factory parameters of the motor generally include the take-off frequency parameters. However, after the machine tool is assembled, the value may change and generally decreases, especially when moving with load. Therefore, the setting parameter is best determined by actual measurement after referring to the factory parameters of the motor. 3. Uniaxial acceleration: used to describe the acceleration and deceleration capability of a single feed shaft in millimeters per second square. This index is determined by the physical characteristics of the machine tool, such as the mass of the moving part, the torque of the feed motor, resistance, cutting load, etc. The larger this value is, the smaller the time spent in the acceleration and deceleration process during the movement, and the higher the efficiency. Generally, for stepping motors, the value is 100 ~ Between 500, for servo motor system, it can be set at 400 ~ Between 1200. In the setting process, start setting a little smaller, run for a period of time, repeat all kinds of typical movements, pay attention to observation, if there is no abnormal situation, then gradually increase. If an exception is found, lower the value and leave 50% ~ 100% of the insurance margin. 4. Curve acceleration: used to describe the acceleration and deceleration capability when multiple feed shafts are linked, in millimeters/second square. It determines the maximum speed of the machine tool when doing circular arc movement. The larger this value is, the greater the maximum allowable speed of the machine tool when doing circular arc movement. Generally, for machine tools composed of stepping motor systems, the value is 400 ~ Between 1000, for servo motor system, it can be set at 1000 ~ Between 5000. If it is a heavy machine tool, the value is smaller. In the setting process, start setting a little smaller, run for a period of time, repeat all kinds of typical linkage movements, pay attention to observation, if there is no abnormal situation, then gradually increase. If an exception is found, lower the value and leave 50% ~ 100% of the insurance margin. Generally considering the driving capacity of stepping motor, friction of mechanical assembly and bearing capacity of mechanical parts, the maximum speed of each shaft can be modified in the manufacturer's parameters, limit the maximum speed of the three axes when the machine tool users actually use it ,. 5. According to the installation position of the three Axis zero sensors, set the return mechanical origin parameter in the manufacturer parameter. When the settings are correct, you can run'Operation'In the menu'Back to the mechanical origin'. First single-axis return, if the movement direction is correct, continue to return, otherwise it needs to stop, reset and set the direction of returning to the mechanical origin in the manufacturer's parameters until all axes can return to the mechanical origin. 6. Set automatic refueling parameters (Set it smaller, such as adding oil once every 5 seconds) , Observe whether the automatic refueling is correct. If it is correct, set the automatic refueling parameters to the actual required parameters. 7. Check whether the set value of electronic gear and pulse equivalent matches. You can make a mark on any axis of the machine tool, and set the coordinate of this point as the working zero point in the software, use direct input command, inching or handwheel and other working methods to make the shaft walk a fixed distance, and use vernier caliper to measure whether the actual distance is attached to the coordinate display distance in the software. 8. Determine whether there is a pulse. You can use an intuitive method: Use a sharp knife to point a point on the workpiece blank, set the point as the work origin, raise the z axis, and then set the Z axis coordinate to 0; Repeatedly make the machine tool move, such as running a typical machining program (It is best to include three-axis linkage) , Can be paused or stopped during processing, then return to the original point of the workpiece, slowly drop the Z axis to see if the tool tip matches the point on the blank. If there is any deviation, please check the type of pulse signal received by the stepping driver and check whether the wiring between the terminal board and the driver is wrong. If there is still tightness or step loss, adjust the acceleration and other parameters in steps 10, 11 and 12. TAG stepping, motor driver, parameters
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