Closed loop Step Servo Drive Driver 2HSS86H + 4.5N.M Motor + Encoder

[JAZZCNC]

Servo motors are closed loop by definition. Whether you've got a closed loop driver on a stepper motor, or a more conventional motor, doesn't change the fact that the driver is continuously monitoring the following error. Following error and position loss are effectively the same thing - the closed loop control corrects for this error with both systems. With either system you should be able to select what happens when this error exceeds a certain threshold - i.e. loss of position.

So then by your definition just sticking a Servo motor and drive on a machine using Mach3 makes it closed loop.!!. . . . NOPE. . .Why not.? . . . .Because Closing the loop is the function of the Motion Controller not the Servo drive or Motor.

Again the Servo can only watch the following error report back to the motion controller and fault if goes past it's parameters. Positional correction is down to the Controller and if like Mach3 it doesn't have the abiilty to close the loop then position is not corrected.
The Closed loop Stepper system has built in controller to do the correction so it doesn't matter if the Controller sending the pulses doesn't close the loop position is still corrected AND just like a TRUE CLOSED LOOP servo system has the abilty to fault if outside set parameters.

Servo's have there place and like in Silyavski case with a very heavy gantry then I agree they are probably better suited.. . . .BUT . . My original case that for general DIY machines having or needing the luxury of CLOSED LOOP capabilty's still applies and they are much easier and cheaper than servo's plus can be just has accurate if correct size for the machine.

Now are they better than standard Stepper system then YES but only because they Close the Loop at the drive and in the case of the smaller 2Nm which use 3 phase motors with 1.2deg step angle makes for a very smooth running motor. They are no more powerful, faster or anything else and if you don't want the Luxury of Closed loop then with Very good drives then agree they are an expensive Luxury that standard steppers can match other than closing the loop and correcting positional loss.

For DIY slaved axis Stepper systems then IMO they are the DOGs Danglies offering the best all round solution with Minimal hassle of setup and high reliabilty against racking or positional loss.!!. . . . It just comes with a price tag.!!

Would I use them.? . . . . Yes but only on high end machine with Slaved Axis.!