Full specification
| Parameter | Value |
|---|---|
| Frame | Φ76 × 62.5 mm |
| Ratio | 48:1 · planetary |
| Rated torque | 30 N·m |
| Peak torque | 97 N·m |
| Weight | 660 g |
| Supply | 24 V nominal · 24–48 V supported |
| Encoder | Dual encoder (2EC) · single-turn absolute on the output side |
| Comms | CAN / CAN FD |
| Brake | None |
| Torque sensor | None |
Source: DAMIAO 2026 product selection catalogue, DM-J planetary series. Figures verified November 2026 — confirm the exact variant against the datasheet issued with your order.
When this is the right choice
- Torque per gram. 30 N·m at 660 g beats every other frame in the range and most harmonics at twice the mass.
- Planetary tolerance of shock. A knee or a foot that gets hit is a better fit here than a flexspline.
- 48:1 in one stage gives a usable holding ratio without a second reducer.
- Half a kilogram less than a comparable harmonic at this torque class.
When it is the wrong choice
- Near-zero backlash requirements. A planetary has more backlash than a harmonic — if a wrist has to reverse within arcminutes, this is the wrong drive.
- Power-off holding. No brake.
- Force control. No sensor; look at the harmonic lines with -F or an integrated sensor.
Alternatives at a similar level
- DAMIAO DM-J8520P — 50 N·m rated, 176 N·m peak at 1,392 g
- DAMIAO DM-J6216 — 10 N·m at 740 g — faster, lighter
- Tongchuan TCHL-20 — 49 N·m harmonic at 1.28 kg when backlash matters
- 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.
DM-J6248 FAQ
How much backlash does a 48:1 planetary have?
More than a harmonic — typically arcminutes rather than tens of arcseconds, and it grows with wear. We ask the factory for the figure at quotation rather than quote a generic number.
Can it be a knee joint?
On a small quadruped or a light biped, yes, and the shock tolerance is a genuine advantage. On a full-size humanoid knee, 97 N·m peak is not enough.
Is there a brake version?
No. If the axis must hold at power-off, plan an external brake or a self-locking ratio.
How long does it take to ship?
Confirmed per order at quotation.
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