The world’s lightest and thinnest smart reducer, Smart-FLEXWAVE

SRJ Series – WPU-SRJ-BD

Input Shaft Unit

The Next-Gen Smart-FLEXWAVE SRJ combines high precision and smart sensing in a compact, high-rigidity design. Its built-in multi-sensor monitors output torque and internal temperature, enhancing process control, efficiency, and safety.

Certified by TÜV SÜD, it simplifies safety compliance while delivering high torque, zero backlash, and smooth, accurate motion. The integrated cross roller bearing and output flange provide stable load support and easy direct mounting — ideal for advanced automation and motion control systems.

Features:

Integrated torque and temperature sensing
TÜV SÜD safety certified
High torque, zero backlash performance
Superior stiffness and precision
Cross roller bearing with direct-mount flange

Multi-Sensor Integration Features

Detects Output Torque
Detects Internal Temperature of Reducer

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	Nominal Output Torque ^*1 [Nm]	Maximum Output Torque ^*2 [Nm]	Emergency Stop Torque ^*3 [Nm]	Nominal Input Speed ^*4 [r/min)	Maximum Input Speed ^*5 [r/min)	Life ^*6 [hours]
35	50	7	23	46	3000	8500	7692
35	80	10	30	61	3000	8500	7692
35	100	10	36	70	3000	8500	7692
42	50	21	44	91	3000	7300	7692
42	80	29	56	113	3000	7300	7692
42	100	31	70	143	3000	7300	7692
42	120	31	70	112	3000	7300	7692
50	50	33	73	127	3000	6500	7692
50	80	44	96	165	3000	6500	7692
50	100	52	107	191	3000	6500	7692
50	120	52	113	191	3000	6500	7692
50	160	52	120	191	3000	6500	7692
63	50	51	127	242	3000	5600	7692
63	80	82	178	332	3000	5600	7692
63	100	87	204	369	3000	5600	7692
63	120	87	217	395	3000	5600	7692
63	160	87	229	408	3000	5600	7692
80	50	99	281	497	3000	4800	7692
80	80	153	395	738	3000	4800	7692
80	100	178	433	841	3000	4800	7692
80	120	178	459	892	3000	4800	7692
80	160	178	484	892	3000	4800	7692

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.

Torque Sensor Data

Features	Description	Notes
Rated torque	Equivalent to the maximum allowable torque of the reducer	-
Limit torque	Equivalent to the emergency stop torque of reducer	-
Durability	Equivalent to reducer	-
Measuring range (Full scale)	Determined by the size of the reducer	-
Non-linearity	±3% FS or less	Range to rated torque
Hysteresis	3% FS or less	Range to rated torque
Cross-axis sensitivity	±1% FS or less	Range to allowable moment of reducer
Temperature compensation	±0.05FS/°C	Use the built-in temperature sensor
Resolution	12-bit	Range: ±2000 LSB:Determined by the size of the reducer
Functional safety	PLd (Category 3) /ISO 13849-1 SIL2 /IEC 61508	Certification is expected in 2024

Temperature Sensor Data

Features	Description	Notes
Accuracy	±2°C	T.B.D.
Measuring range	0°C ~ 80°C	-
Resolution	0 ~ 800 bit	LSB: 0.1°C

General Data

Features	Description	Notes
Power supply voltage	DC24V+10%/-15%	-
Consumption current	0.06A or less	T.B.D.
Communication method	2-wire RS-485	-
Baud rate	3.0Mbps	-
Operating temperature limit	0°C ~ 80°C	-

Sensor Measurement Range

Frame	Ratio *^1**	Rated Lod [Nm]	Full Scale [Nm]	Full Scale [LSB]
35	50	23	± 50	0.025
35	80	30	± 50	0.025
35	100	36	± 50	0.025
42	50	44	± 100	0.050
42	80	56	± 100	0.050
42	100	70	± 100	0.050
42	120	70	± 100	0.050
50	50	73	± 150	0.075
50	80	96	± 150	0.075
50	100	107	± 150	0.075
50	120	113	± 150	0.075
50	160	120	± 150
63	50	127	± 300	0.150
63	80	178	± 300	0.150
63	100	204	± 300	0.150
63	120	217	± 300	0.150
63	160	229	± 300	0.150
80	50	281	± 600	0.300
80	80	395	± 600	0.300
80	100	433	± 600	0.300
80	120	459	± 600	0.300
80	160	484	± 600	0.300

“+” sign indicates clockwise (CW) torque.
LSB is an abbreviation for Least Significant Bit.

Smart-Flexwave Weight and Size

Model	Weight ^*1 [kg]	Outer Diameter of Cover A ^*2 [mm]	Thickness ^*3 [mm]
WPU-35-□-SRJ-BD	0.72	+ 4	+ 7
WPU-42-□-SRJ-BD	1.0	+ 4	+ 7
WPU-50-□-SRJ-BD	1.4	+ 0	+ 5
WPU-63-□-SRJ-BD	2.1	+ 0	+ 5
WPU-80-□-SRJ-BD	4.2	+ 0	+ 5

Weight is almost same with based reducer.
Outer diameter of #35 and #42 is larger than based reducer ones.
Thickness increases with all models against based reducer.

Closed Type: Component

WPU-□-□-SRH-BD Dimensions

Frame Size	Weight Kg	Moment of Inertia x10^-4kgm²
35	0.71	0.0266
42	0.96	0.0666
50	1.4	0.155
63	2.1	1.382
80	4.2	1.28

[mm]

Frame Size	LA	LB	LC	LD	LE	LF	LG	LH	LJ	LK	LL	LP	LQ	LR
35	44	36	54	70	505	27.5	8	15	2.5	8	16	11	-	-
42	54	45	64	80	56	30	10	16	3	8.5	17	12	-	-
50	62	50	75	90	63.5	30	16	17.5	3	9	15.5	-	16.5	20
63	77	60	90	110	72.5	31	21	20.5	3	8.5	15.5	-	22.5	25
80	100	85	115	142	84.5	37	21	26.5	3	9.5	17	-	22.5	25

Frame Size	SA	SB	SC	SE	SF	SV	SW	M	ST	SU	N	LT
35	64	6	-	78	21.6	-	-	8	3.5	-	8	M3× 5, φ3.5× 11.5
42	74	8	-	88	25.8	-	-	12	3.5	-	16	M3× 6, φ3.5× 12
50	84	10	8.2	95	28.3	3	3	12	3.5	M3 X 6	16	M3× 6, φ3.5× 13.5
63	102	14	11	115	34.3	5	5	12	4.5	M5 X 10	16	M4× 7, φ4.5× 15.5
80	132	14	11	145	42.9	5	5	12	5.5	M5 X 10	16	M5× 8, φ5.5× 20.5

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SRJ Series – WPU-SRJ-BD