Full specification
| Parameter | Value |
|---|---|
| Frame / size | Φ80 × 80.5 mm |
| Ratios | 50:1 / 100:1 |
| Rated torque @2000 rpm input | 27 / 47 N·m |
| Average output torque | 38 / 75 N·m |
| Start–stop peak | 69 / 110 N·m |
| Instantaneous max | 127 / 184 N·m |
| Weight | 1,266 g |
| Encoder | Dual absolute encoder |
| Force control | -F version available — the largest RHU frame that offers it |
Source: EYOU selection manual 2026.08, pp. 6–8, including the RHU-F range limit. Figures verified November 2026 — confirm the exact variant against the datasheet issued with your order.
When this is the right choice
- The last self-sensing frame. If the axis must measure torque without an external sensor, this is the biggest RHU you can buy.
- Shoulder roll, elbow pitch, heavy wrist. 110 N·m start–stop covers a 5–8 kg payload arm.
- 184 N·m instantaneous — headroom for deceleration and for the first moment of a collision.
- 1.27 kg keeps it inside a forearm or a compact shoulder.
When it is the wrong choice
- Hips and knees. Above this torque class, EYOU’s answers are RHU32H and RHU40H — and neither has built-in force control.
- Wrists on light arms. RHU20L-70 saves 450 g and half the volume.
- Where a brake is required. Confirm the brake option for this frame before designing around it.
Alternatives at a similar level
- EYOU RHU32H-120 — 124–169 N·m at 4.08 kg — no built-in sensor
- EYOU RHU20L-70 — 28–57 N·m at 811 g, also available with -F
- Tongchuan TCHL-25 — 83 N·m at 1.85 kg with a -TH2 sensor option
- Crabnova CE-RBV3-R83-101 — 53–120 N·m with brake and 200 N·m sensor, 1.60 kg
Quote this model
Model, quantity and destination is enough to start — we come back with price, availability and the datasheet.
RHU25L-80 FAQ
Why does force control stop at this frame?
EYOU’s -F option is built into the 14, 17, 20 and 25-size RHU modules only. RHU32H and RHU40H are not offered with it, so a force-controlled knee or waist needs an external sensor and a bracket.
47 N·m continuous — is that enough for a shoulder?
For shoulder roll and yaw on a 40–60 kg platform, yes. For shoulder pitch lifting a long arm against gravity, work out the gravity torque first; it is often twice the payload calculation.
What is the difference from TCHL-25 at a similar torque?
TCHL-25 is 83 N·m at 1.85 kg with optional brake and sensor; RHU25L-80 is 47 N·m at 1.27 kg with force control available. Different torque class and different sensing story.
How long does it take to ship?
Confirmed per order at quotation.
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