Question 1

Will powering this motor with a 12v 2A power supply cause damage? The motor is rated for 12v at 1.68A

Accepted Answer

No. The IV relation is fixed, meaning when you apply a certain voltage, a corresponding amount of current will flow. Due to the resistances of the windings, when you apply 12 V, only 1.68 A will flow by design. If you try to force 2A, then you will need a higher voltage.

With that being said, it is better to use a stepper motor controller IC instead of driving the motor directly from the power supply.

Question 2

How noisy is this motor?

Accepted Answer

It has been a long time since I purchased this gear motor and put it service, but do not remember it as being at all noisy.

Question 3

How much torque is necessary to backdrive this gearbox? I am looking for a backdrivable gearbox.

Accepted Answer

Are you refering to the gearbox alone or the gearbox plus the motor? The gearbox will simply amplify the amount of torque: if it's a 1:100 gearbox, for backdriving, you need 100 times the torque compared to backdriving the stepper motor shaft directly. As for the actual torque in the presence of the motor, it varies depending on how much current is flowing through the motor.

As a crude estimate, even without any current flowing, it is VERY difficult for an average adult male to backdrive the shaft of the gearbox.

Question 4

Is this kind of motor (with planetary gearbox) necessary for the construction of a syringe pump, or can i use just a nema 17 stepper motor?

Accepted Answer

I have used the nema 17 stepper motor for making a syringe pump with no gearbox using a leadscrew just fine for up to 25mL syringes. The leadscrew provides sufficient gearing itself. There is a good open source version on university of British Columbia. Possibly a larger syringe would necessitate a gearbox

ASIN	B00QEVLDVO
ASIN	B00QEVLDVO
Brand Name	STEPPERONLINE
Customer Reviews	4.4 4.4 out of 5 stars (39)
Customer reviews	4.4 4.4 out of 5 stars (39)
Date First Available	15 February 2015
Is Discontinued By Manufacturer	No
Item Dimensions W x H	42W x 42H millimeters
Item Weight	620 Grams
Item model number	17HS19-1684S-PG51
Manufacturer	OSM Technology Co.,Ltd.
Manufacturer	OSM Technology Co.,Ltd.
Material Type	Metal
Model	17HS19-1684S-PG51
Model Name	gear
Number of Items	1
Part Number	17HS19-1684S-PG51
Product Dimensions	4.2 x 4.2 x 4.8 cm; 620 g
Speed	4 RPM
UPC	701056517046
Voltage	12 Volts

STEPPERONLINE 51:1 Precision Camera for Nema 17 High Torque Planetary Gearbox

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