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Closed-loop NEMA34 stepper motor

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xzswq21:
Hello
I need several Closed-loop stepper motors with driver for a CNC machine. Holding Torque of 3 N.m is enough but it should be reliable (the accuracy is important for my work, I want to produce precision things). Do you know a reliable closed-loop NEMA 34 stepper motor?
(The power supply is 48VDC but I can use an AC power supply)

Thanks

ajb:
Any stepper (or any other kind of motor) can be closed loop with the addition of an encoder and a suitable driver. At that size there are plenty of options, including all-in-one servo systems, some that even have on-board motion control, ranging from cheap eBay stuff to components that are used in real CNC machines with eye watering price tags.

You mention reliability in the same sentence as accuracy, but accuracy, reliability, precision, and repeatability are all different but equally important parameters for things like CNC machines, and they're only partially dependent on the motor. The mechanics of the machine are as important or even more. What sort or specs are you after?

xzswq21:
The mechanism is ballscrew and the pitch is 5mm, if I use a 2-phase stepper motor the resolution would be 5mm/200=0.025mm=0.001" and usually the error of a 2-phase motor is +/-5 %. Can I enable microstep function on the driver to have a better resolution for the 2-phase stepper motor? What do you think about Leadshine stepper motors? Thanks

NiHaoMike:
Trinamic ASICs can drive stepper motors as high pole count BLDC motors, using sensorless drive to achieve closed loop control.

xzswq21:

--- Quote from: NiHaoMike on November 09, 2021, 04:52:29 am ---Trinamic ASICs can drive stepper motors as high pole count BLDC motors, using sensorless drive to achieve closed loop control.

--- End quote ---

I checked the website but there are a lot of products. I need a STEP/DIR driver for the stepper motors.

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