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52PA/57BYG Stepping motor planetary gear reducer, 1. gearbox diameter :52mm, 2. motor diameter :57mm, 3. stepper motor - details see: https://www.machineto.com/52pa-57byg-stepping-motor-planetary-gear-reducer-10234466

52PAXXXG Planetary gear reducer parameters XXX=Reduction Ratio

Reduction Ratio(X:1)	4	8	16	25	36	50	64	72	81	100	128	144	200
Number of gear trains	1	1	2	2	2	2	2	3	3	3	3	3	3
Rated output torque(kg.cm)	100	100	150	150	150	150	150	200	200	200	200	200	200
Gear Box Length(mm)	49.5	49.5	64.5	64.5	64.5	64.5	64.5	79.5	79.5	79.5	79.5	79.5	79.5

Stepping motor parameter

Model	Step Angle	Length (Ld)	Phase Voltage	Phase Current	Phase Resistance	Phase Inductance	Holding Torque	Lead Wire
57BYGH41(M)-144-4A/B	1.8/0.9	41mm	4.1V	1.44A	2.85Ω	5.4mH	4kg.cm	4
57BYGH51(M)-144-4A/B	1.8/0.9	51mm	4.74V	1.44A	3.3Ω	8.2mH	9kg.cm	4
57BYGH56(M)-100-6A/B	1.8/0.9	56mm	7V	1.0A	7.6Ω	10mH	9kg.cm	6
57BYGH56(M)-280-4A/B	1.8/0.9	56mm	2.52V	2.8A	0.9Ω	2.5mH	12.5kg.cm	4
57BYGH76(M)-200-6A/B	1.8/0.9	76mm	5V	2.8A	2.25Ω	3.6mH	13.5kg.cm	6
57BYGH76(M)-280-4A/B	1.8/0.9	76mm	3.16V	2.8A	1.13Ω	3.6mH	18.9kg.cm	4

Gearbox diameter:φ56mm
Output shaft diameter:φ12mm
Configuration encoder:yea
We could customize to meet your special requirements.