Planetary gearbox
Harmonic Drive HPG Harmonic Planetary gearheads
A precision planetary gearhead for servo motors. It uses a flexible internal gear to keep backlash low over its life, with an optional reduced-backlash grade.
Key specifications
| Rated torque (max) | 850 Nm |
|---|---|
| Peak torque (max) | 4,500 Nm |
| Speed (max) | 10,000 rpm |
| Ratio | 3–50:1 |
| Backlash (max) | 3 arcmin |
| Sizes | 11, 14, 20, 32, 50, 65 |
Summarised in our own words from Harmonic Drive SE / Harmonic Drive LLC's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
Rated torque 850 Nm is the L10 figure for size 65 (230 mm frame) at 25:1; L50 goes up to 1650 Nm. 4500 Nm is the momentary peak limit for size 65 and 3200 Nm is the maximum repeated peak. Backlash is <3 arcmin as standard and <1 arcmin optional (sizes 14–65). Frame flange sizes are 40/60/90/120/170/230 mm. 10000 rpm is the size 11 maximum input speed. Wash-down versions are offered, but no IP figure is given. Related types are HPGP, HPG-R, HPG-RA and HPG-U1.
Specify Motion is not affiliated with Harmonic Drive SE / Harmonic Drive LLC. Harmonic Drive and HPG Harmonic Planetary gearheads are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Harmonic Drive part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
High-rigidity Wanshsin inline planetary with three backlash classes down to super-precision, for machine tools, automation and AGVs.
| Published maximum | HPG Harmonic Planetary gearheads | WSH |
|---|---|---|
| Rated torque | 850 Nm | 2,400 Nm meets or exceeds |
| Peak torque | 4,500 Nm | 7,200 Nm meets or exceeds |
| Ratio (max) | 50:1 | 100:1 meets or exceeds |
| Backlash (lower is better) | 3 arcmin | 1.5 arcmin meets or exceeds |
Wanshsin inline planetary designed for high radial loads, offered in three precision classes.
| Published maximum | HPG Harmonic Planetary gearheads | WTH |
|---|---|---|
| Rated torque | 850 Nm | 2,050 Nm meets or exceeds |
| Peak torque | 4,500 Nm | 6,150 Nm meets or exceeds |
| Ratio (max) | 50:1 | 100:1 meets or exceeds |
| Backlash (lower is better) | 3 arcmin | 1.5 arcmin meets or exceeds |
Apex Dynamics AGV planetary with a rotating housing so a drive wheel or pulley can mount directly over it; GLS takes shaft input for belt drive.
| Published maximum | HPG Harmonic Planetary gearheads | GL / GLS |
|---|---|---|
| Rated torque | 850 Nm | — |
| Peak torque | 4,500 Nm | — |
| Ratio (max) | 50:1 | 90:1 meets or exceeds |
| Backlash (lower is better) | 3 arcmin | 3 arcmin meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Other planetary gearbox series
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