AC speed regulation motor + turbo reducer instead of cam cutter + AC motor?
If the worm gear reducer is used, though the worm gear pair can be made in reverse direction, the backlash of the worm gear will cause errors, i.e. backlash. The backlash generated by the backlash of the worm gear is much larger than the error of the cam cutter. Generally, the back clearance of the ordinary worm gear reducer can reach over 15 arc points. That would be a difference of 1/4 degrees. If the rotary disc diameter is large, the backlash is very terrible, the center deviation 1/4 degrees, the radius of 500 place would be how much can calculate. Therefore, the use of worm, generally have aided detection apparatus, using a switch to detect the position you want to stop, such as detection photoelectric switch block inspection of several indexing arrangement, to immediately stop the motor stop in the detection signal. However, due to the inertia of the motor, there will be a bit of overshoot after stopping. Therefore, it is necessary to put some parameters into the design, and then to design the fast position for the adjustable structure.
The main error in cam dividers is that:1, because of the impact of inertia, resulting in errors caused by elastic deformation2., because of inertia lead to overshoot error3, cam gap caused by machining gap error
But this method of use is not very reliable, if the switch is broken, then it has only been turned. So this method uses a lot of reciprocating rotation of the situation. A stroke switch is arranged at both ends of the reciprocating stroke, and if the detecting switch is broken, the switch is stopped by the stroke switch after the prescribed stroke is exceeded.In addition, the mechanism of the worm is only suitable for low speed, high speed condition, due to the impact of rotary body, namely back rebound, the backlash of worm caused by tooth side collision and rebound, resulting in inaccurate positioning.In addition, the rotating disk can not be subjected to impact load when it is stationary, and this will cause the rotation of the center of the rotating body because of the poor alignment, so that the positioning is accurate.
