Must cam indexer be driven by brake motor?
Friends, when you choose the cam indexer motor, taking into account the vast majority of the use of the actual situation, are to stop the motor to extend the stopping time, you will think that the ordinary motor stops when there is inertia, stopping is not allowed, must use the brake motor. Is this really the case?
First of all, we have to start with the structural principle of the cam divider. Cam indexer input shaft cam diagonal segment drive the output shaft needle roller along the output axis of the rotation, so as to achieve the output shaft rotation that is indexed; cam linear segment lock needle roller bearings, so as to achieve the output shaft is stationary that is positioning. In other words, as long as the needle roller bearing is in the cam linear segment every time the motor stops, the position of the output shaft is accurate no matter what position it is in the linear segment. This is the cleverness of the cam divider and the key to distinguish the cam divider from other indexing mechanisms.
Practical use cases tell us that when the turntable goes into place, i.e., the slanting part of the cam of the input shaft has finished, and just entered the slanting section of the cam (the corresponding angle that is the angle of repose), at this time, the input shaft with a photoelectric or proximity switches will send out a signal, through which the signal goes to the motor to disconnect the power, due to the inertia of the motor, the motor gearhead will also continue to rotate a little bit forward, and the inertia caused by the rotation of the straight line section, it depends on the output rotational speed of the gearhead. Whether the rotation caused by this inertia goes through a straight section, it depends on the output speed of the reducer.
According to years of actual use cases, generally, the angle of repose is 90 degrees, the input shaft speed is lower than 45 rpm, that is, the reduction ratio is 30 or more (assuming that the motor speed of about 1400 rpm), this time the inertia caused by the rotation to go through the straight line section, that is, to go through the angle of repose, this time the motor does not need to be with a brake, with an ordinary motor can be, on the contrary, be sure to use the braking motor, or else it will be easy to go through the straight line section that is, the angle of repose, resulting in positioning inaccuracy. Angle of repose, resulting in inaccurate positioning. Of course, the stepper motor servo motor is not necessary to brake, because of its own signal to stop in time will not cause the phenomenon of walking through.
Theme summary, cam indexer input rotation is lower than 45 rpm, no brake motor. On the contrary, cam indexer input revolution is higher than 45 rpm, to use the brake motor.