Geared Motor
B4S12-21XX with Planetary gear

This is a combination of the planetary gear head SPG12, which has excellent durability under high loads / capable of transmitting high torque, and brushless motor B4S12-21XX.

Specifications

Gear Ratio	3.5	4.8	12	23	43※	58	79※	107	150※	204※	375※	509
Reduction ratio (absolute value)	3.50:1	4.75:1	12.25:1	22.56:1	42.88:1	58.19:1	78.97:1	107.17:1	150.06:1	203.66:1	375.10:1	509.07:1
Number of stage	1	1	2	2	3	3	3	3	4	4	4	4
Efficiency[%]	85	85	72	72	61	61	61	61	52	52	52	52
Direction of rotation	=	=	=	=	=	=	=	=	=	=	=	=
Length[mm] （Motor＋Gear＝L2）	35.2	35.2	39	39	42.8	42.8	42.8	42.8	46.7	46.7	46.7	46.7
Length[mm] （Motor＋Gear＋Encoder＝L3）	42.4	42.4	46.2	46.2	50	50	50	50	53.9	53.9	53.9	53.9
Weight[g] （Motor＋Gear）	29.6	29.6	32.1	32.1	34.6	34.6	34.6	34.6	37.1	37.1	37.1	37.1
Max allowable torque (Continuous)[mNm]	100
Max allowable torque (Intermittent)[mNm]	200

B4S12-2108BP
Rated voltage:12V

Gear Ratio	3.5	4.8	12	23	43※	58	79※	107	150※	204※	375※	509
Rated Torque[mNm]	5	6	14	26	42	57	77	100	100	100	100	100
Rated Speed[rpm]	3,708	2,704	1,059	576	303	223	164	122	89	68	39	29
No Load Speed[rpm]	4,334	3,160	1,238	673	354	261	192	141	101	74	40	30
No Load Current[mA]	70	70	70	69	70	70	71	71	71	71	71	71
Stall Torque[mNm]	33	45	97	179	289	393	533	723	860	1,167	2,149	2,917
Stall Current[mA]	1,592

B4S12-2109BP
Rated voltage:15V

Gear Ratio	3.5	4.8	12	23	43※	58	79※	107	150※	204※	375※	509
Rated Torque[mNm]	5	7	15	27	44	59	81	100	100	100	100	100
Rated Speed[rpm]	4,667	3,403	1,333	725	381	281	207	155	113	86	49	36
No Load Speed[rpm]	5,454	3,977	1,558	847	445	328	242	178	127	94	51	37
No Load Current[mA]	74	74	74	72	74	74	74	74	74	74	74	74
Stall Torque[mNm]	34	47	102	188	303	411	558	757	901	1,223	2,252	3,057
Stall Current[mA]	1,592

※ Non-standard gear

HOW TO ORDER

B4S12-2108B＋ SPG12-12(12.25:1)　→　B4S12-2108BP12