Replacing 28BYJ48 and PX/PK245 by Towerpro MG90/SG91R

I found 28byj48 very slow.  PX245 is fast, but too bulky.  So I am thinking of using 9g servo, such as Towerpro mg90 (CNY26) or sg91r (CNY15).


*** Vexta PX245-02AA US$21.00 ***

Quick Overview Vexta PX245-02AA Single Shaft NEMA 17 - SIZE 42mm
1.8deg / 200 steps/revolution
Holding torque 61 oz-in (43 N.cm)

Product Description

NEMA 17 - SIZE 42mm, 1.8deg, 200 steps per revolution in Full Step Mode.

You may increase this resolution by using microstepping driver.

Manufactured by Oriental Motor CO, Ltd.

It offers 61 oz-in (43 N.cm) of holding torque in small NEMA 17 frame (42mm). Single, round shaft with long flat. Works great with
Interinar or any other bipolar and unipolar driver with at least 0.8A/phase (unipolar) or 0.57A/phase (bipolar).

This motor is designed for demanding applications at moderate to fast speeds. Small Nema 17 frame with torque of lower range Nema 23.


Vexta PX245

1.8 deg/step = 200 steps/revolution

holding torque = 61 oz.in (43 N.cm)


*** 28BYJ48-12 ***

5.625 degrees / 64 per step = 0.088 degree / step = 4,096 steps / revolution.

detent torque = 350 g.cm

resistance/phase = 300R

Torque unit conversion

43 newton centimeter = 4384.779715805 gram-force centimeter
http://www.unitconversion.org/unit_converter/torque.html

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