After some time stepper motor is hot

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After some time stepper motor is hot

This is to some degree, completely normal and expected. From the datasheet for a typical NEMA 17 stepper, the rated temperature rise is 80 °C above ambient and the maximum operating temperature is 130 °C (implying an ambient temperature of 50 °C). It is normal that stepper motors (in general) get a bit hot.

"Too hot to touch" is still relatively cold. 60 °C is already too hot to touch, and that's only a 40 °C rise above a 20 °C ambient temperature.

You can reduce the temperature rise of the motors by reducing the current they receive. The stepper driver has a small potentiometer that can be turned to adjust the current, but keep in mind that doing so will also reduce the torque of the motors and thus they might skip steps if you reduce the current too much.

Technical details: Note that stepper motor drivers used in 3D printers are constant current drivers, and the little potentiometer controls the current. If you had not paid much attention to this potentiometer, the drivers might all have been set for the same constant current of 1.0 A. The stepper driver would (to achieve the same constant current) send a higher voltage to the higher resistance motors. This would imply a power dissipation of 2.4 W in the Nema 17, and a power dissipation of 10.5 W in the small stepper. 2.4 W in the Nema 17 would only heat it up by about 20 °C above ambient. A dissipation of 10 W in the small stepper, which also has much less surface area to dissipate the power, would heat it up by a lot (and probably, given that you didn't fry it, the current was set lower -- or a technical peculiarity limited the current given that the motor likely also has very low inductance).

Cloudray Stepper Motor Series has set the standard for quality, reliability, and durability in stepping motors. The precision of our Torque Power motors is matched only by the dependability of their performance. All Torque Power motors are bi-directional and totally enclosed with permanently lubricated ball bearings for long-lasting, smooth operation.
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer

High Torque, High Precision and Long life is Cloudray's core advantages

 

                       Low vibration,Low heating, No loss of stepFast Response,
                                   Better Acceleration Performance.
   Thanks to a robust design they can be selected for the harshest environments. Precise, open-loop, speed and position control can be achieved with the application of full step, half step, or microstepping electronics.
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
                 Higher Resolution,Avoidance of Resonance Regions
Stepping angle is adjustable( rang in 18°±5%), 0.9 °stepper motor's stepping angle is smaller, fineness is higher and positioning is more accurate.Avoiding vibration,runs more smoothly and gets lower noise.
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
                            Sturdy structure, extremely long life
      High quality materials including bearings and shaft made in Japan
Robust assembly, high speed range, and exceptional performance in even the harshest environments make Cloudray Stepper Motors the perfect solution for demanding positioning applications.
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
Short length and light weight allow them to be used in highly integrated systems.
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printerr Fit for CR10 3D Printer

                       

Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer

            

 Cloudray stepper motor factory video

Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer
Nema 17 Stepper Motor 42 x 42mm for extruders 3D Printer

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