Planetary gearbox
Lenze g7x0-P planetary gearboxes gearbox
Planetary and bevel-planetary servo gearboxes (g700-P to g780-P) for 4 to 800 Nm with flange, solid or hollow output and lifetime lubrication in any mounting position.
Key specifications
| Torque range | 4–800 (type not stated) |
|---|---|
| Geared motor power | 0.12–55 kW |
| Variants | g700-P, g720-P, g730-P, g750-P, g780-P |
| Lubrication | lifetime, any mounting position |
Summarised in our own words from Lenze SE's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
No ratio or backlash values published on the page read.
Specify Motion is not affiliated with Lenze SE. Lenze and g7x0-P planetary gearboxes 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 Lenze 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.
Apex Dynamics economy planetary family (PE, PG, PA, PS, PN, PD, PL sub-series) for high-volume automation; standard backlash, inline or right-angle.
View P-II / P-IIR →Apex Dynamics high-precision helical planetary with a one-piece stainless planet cage and very short length; ADS adds a keyed input shaft for belt pulley or coupling drive.
View AD / ADR / ADS →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.
View GL / GLS →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.
What a planetary gearbox is
A planetary gearbox reduces speed and multiplies torque using a central sun gear driven by the motor, several planet gears on a carrier, and an outer ring gear. Load is shared between the planets, so the gearbox is compact, coaxial and torque-dense. A single stage typically gives ratios of about 3:1 to 10:1, and stages are combined for higher ratios. Precision servo planetaries use ground helical or spur gears, preloaded output bearings and a motor adapter flange, with backlash typically a few arcminutes or less.
When engineers choose a planetary gearbox
Choose a planetary gearbox for most servo and stepper axes that need more torque, lower reflected inertia or a better inertia match. It is efficient, typically above 95% per stage, stiff and widely available in standard frames. The trade-offs are backlash, which is low but not zero, and limited single-stage ratio. For zero backlash in a compact joint, a strain-wave gear suits better. For very high shock loads, a cycloidal reducer may be more robust.
How to specify the Lenze g7x0-P planetary gearboxes
Send these with your enquiry and an engineer can confirm the right g7x0-P planetary gearboxes variant or an equivalent:
- Ratio and output speed (:1, rpm)
- Nominal and peak output torque (Nm)
- Emergency stop torque (Nm)
- Backlash (arcmin) and torsional stiffness (Nm/arcmin)
- Radial and axial output loads (N)
- Motor flange, shaft diameter and length (mm)
- Duty cycle, mounting orientation and lubrication
Common mistakes to avoid
- Sizing on motor torque times ratio without checking acceleration torque and service factors
- Ignoring the input speed limit at high motor speeds
- Mounting a pulley or pinion that overloads the output bearing
- Forgetting the gearbox efficiency and heat in continuous duty
Lenze g7x0-P planetary gearboxes: frequently asked questions
What is the Lenze g7x0-P planetary gearboxes?
Planetary and bevel-planetary servo gearboxes (g700-P to g780-P) for 4 to 800 Nm with flange, solid or hollow output and lifetime lubrication in any mounting position. It is made by Lenze SE; Specify Motion can help source it or propose an equivalent.
Who makes the Lenze g7x0-P planetary gearboxes?
The Lenze g7x0-P planetary gearboxes is made by Lenze (Lenze SE) and is listed here for engineers comparing options. Specify Motion is not affiliated with Lenze SE; brand names are used only to identify the product.
Is there an alternative to the Lenze g7x0-P planetary gearboxes?
Yes. On published figures, APEX Dynamics P-II / P-IIR and APEX Dynamics AD / ADR / ADS are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
How do I choose a planetary gearbox ratio?
Start from the load speed and motor speed range, then check inertia matching and torque. A ratio that brings the reflected load inertia close to the motor inertia improves dynamics. Then confirm peak output torque during acceleration is within the gearbox rating and that input speed stays under the limit.
What backlash does a precision planetary gearbox have?
Precision servo planetary gearboxes typically have backlash from below one arcminute to several arcminutes, depending on grade and stages. Lower backlash costs more. For most positioning axes, a few arcminutes is fine; for robot joints or optics, strain-wave or zero-backlash designs are used.
Further reading: How to select a planetary gearbox · Harmonic vs planetary vs cycloidal · Gearboxes and harmonic drives
Other planetary gearbox series
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