Nidec's Next-Gen FLEXWAVE High Torque Type – WPU-SRH - Nidec Drive Technology Corporation

WPU-SRH Series – High Torque Type

Open Type Unit (Hollow Unit)

The WPU-SRH Series is a compact hollow-shaft gearhead engineered for high torque output, precision, and durability. Utilizing advanced FLEXWAVE gear technology within an integrated housing, it achieves zero backlash and excellent repeatability. The large hollow input shaft allows easy cable or shaft routing, while the built-in cross roller bearing and output flange provide direct, rigid load support, eliminating the need for additional external bearings.

Features:

Zero backlash
Large hollow input shaft for easy integration
Positioning accuracy: <1 arc-min (most sizes)
High torsional stiffness and torque capacity
Robust cross roller output bearing for stability
Output flange for direct load mounting

Model Selection Flow

Ratio Matrix Availability

Frame Size	50 Reduction Ratio	80 Reduction Ratio	100 Reduction Ratio	120 Reduction Ratio	160 Reduction Ratio
35	✔	✔	✔	❌	❌
42	✔	✔	✔	✔	❌
50	✔	✔	✔	✔	✔
63	✔	✔	✔	✔	✔
80	✔	✔	✔	✔	✔

Reducer Specifications

Frame Size	Ratio R^*1	Nominal Output Torque^*2 [Nm]	Maximum Output Torque ^*3 [Nm]	Emergency Stop Torque ^*4 [Nm]	Nominal Input Speed ^*5 [r/min)	Maximum Input Speed^*6 [r/min)	Life ^*7 [hours]
35	50	7	23	46	3000	8500	10000
35	80	10	30	61	3000	8500	10000
35	100	10	36	70	3000	8500	10000
42	50	21	44	91	3000	7300	10000
42	80	29	56	113	3000	7300	10000
42	100	31	70	143	3000	7300	10000
42	120	31	70	112	3000	7300	10000
50	50	33	73	127	3000	6500	10000
50	80	44	96	165	3000	6500	10000
50	100	52	107	191	3000	6500	10000
50	120	52	113	191	3000	6500	10000
50	160	52	120	191	3000	6500	10000
63	50	51	127	242	3000	5600	10000
63	80	82	178	332	3000	5600	10000
63	100	87	204	369	3000	5600	10000
63	120	87	217	395	3000	5600	10000
63	160	87	229	408	3000	5600	10000
80	50	99	281	497	3000	4800	10000
80	80	153	395	738	3000	4800	10000
80	100	178	433	841	3000	4800	10000
80	120	178	459	892	3000	4800	10000
80	160	178	484	892	3000	4800	10000
100*	50	178	523	892	3000	4000	10000
100*	80	268	675	1270	3000	4000	10000
100*	100	345	738	1400	3000	4000	10000
100*	120	382	802	1530	3000	4000	10000
100*	160	382	841	1530	3000	4000	10000

Reduction ratio is to be calculated by the formula in the previous page, using R value in this table.
The maximum allowable value at the input rotation speed of 2000r/min
The maximum torque when starting and stopping.
The maximum torque when it receives shock.
The maximum average input speed.
The maximum input speed.
The life time at the input rotation speed of 2000 r/min and nominal output torque.

*100 frame option is currently only available for open type

* 100 frame option is available for S: Simple unit type and U: Unit type (Input shaft unit) and (Hollow shaft)

Open Type: Unit (Hollow Shaft)

WPU-□-□-SRH

Frame Size	Weight Kg	Moment of Inertia x10-⁴kgm²
35	0.72	0.0924
42	1.0	0.207
50	1.4	0.408
63	2.1	1.06
80	4.2	2.72
100	7.2	8.66

[mm]

Frame Size	LA	LB	LC	LD	LE	LF	LG	LH	LJ	LK	LL	LP	LQ	LR
35	44	36	54	70	52.5	20.5	12	20	7.5	8	9	2.5	5.5	6.5
42	54	45	64	80	56.5	23	12	21.5	8.5	8.5	10	2.5	5.5	6.5
50	62	50	75	90	51.5	25	5	21.5	7	9	10.5	-	-	-
63	77	60	90	110	55.5	26	6	23.5	6	8.5	10.5	-	-	-
80	100	85	115	142	65.5	32	7	26.5	5	9.5	12	-	-	-
100	122	100	140	170	79	38	8	33	7	13	14	-	-	-

Frame Size	SA	SB	SC	SD	SE	SF	M	ST	SU	N	LT
35	64	-	14	20	74	36	8	3.5	M3	8	M3 X 5, ∅ 3.5 X 11.5
42	74	-	19	25	84	45	12	3.5	M3	16	M3 X 6, ∅ 3.5 X 12
50	84	25.5	21	30	95	-	12	3.5	M3 X 6	16	M3 X 6, ∅ 3.5 X 13.5
63	102	33.5	29	38	115	-	12	4.5	M3 X 6	16	M4 X 7, ∅ 4.5 X 15.5
80	132	40.5	36	45	147	-	12	5.5	M3 X 6	16	M5 X 8, ∅ 5.5 X 20.5
100	158	52	46	59	175	-	12	6.6	M4 X 8	16	M6 X 10, ∅ 6.6 X 25

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WPU-SRH Series – High Torque Type