Planetary gearbox
Nidec ABLE VRT planetary gearbox
Flange-output coaxial servo planetary reducer in frame sizes 042 to 285, ratios 4 to 100 and allowable torque 6 to 3,300 Nm (series maximum).
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Ratio | 4–100:1 |
|---|---|
| Sizes | 042C–285C (9 sizes) |
| Allowable torque max | 3,300 |
Summarised in our own words from NIDEC CORPORATION's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Specify Motion is not affiliated with NIDEC CORPORATION. Nidec and ABLE VRT are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Nidec ABLE VRT replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Nidec part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Apex Dynamics economy planetary family (PE, PG, PA, PS, PN, PD, PL sub-series) for high-volume automation; standard backlash, inline or right-angle.
| Published maximum | ABLE VRT | P-II / P-IIR |
|---|---|---|
| Rated torque | — | 459 Nm |
| Ratio (max) | 100:1 | 1,000:1 meets or exceeds |
Economy spur-gear planetary in round (WPL) or square (WPF) flange formats, for general duty where precision is not critical.
| Published maximum | ABLE VRT | WPL / WPF |
|---|---|---|
| Ratio (max) | 100:1 | 100:1 meets or exceeds |
High-rigidity Wanshsin inline planetary with three backlash classes down to super-precision, for machine tools, automation and AGVs.
| Published maximum | ABLE VRT | WSH |
|---|---|---|
| Rated torque | — | 2,400 Nm |
| Peak torque | — | 7,200 Nm |
| Ratio (max) | 100:1 | 100:1 meets or exceeds |
| Backlash (lower is better) | — | 1.5 arcmin |
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.
Typical applications
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 Nidec ABLE VRT
Send these with your enquiry and an engineer can confirm the right ABLE VRT 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
Nidec ABLE VRT: frequently asked questions
Can you help replace Nidec ABLE VRT or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Nidec ABLE VRT?
Flange-output coaxial servo planetary reducer in frame sizes 042 to 285, ratios 4 to 100 and allowable torque 6 to 3,300 Nm (series maximum). Published series figures include ratio 4:1, ratio 100:1. It is made by NIDEC CORPORATION; Specify Motion can help source it or propose an equivalent.
Who makes the Nidec ABLE VRT?
The Nidec ABLE VRT is made by Nidec (NIDEC CORPORATION) and is listed here for engineers comparing options. Specify Motion is not affiliated with NIDEC CORPORATION; brand names are used only to identify the product.
What is the ratio of the Nidec ABLE VRT?
The published series minimum ratio is 4:1. Individual models and sizes in the ABLE VRT range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Nidec ABLE VRT?
We can assess suitable replacement options. On published figures, APEX Dynamics P-II / P-IIR and Wanshsin WPL / WPF are options to assess 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
Engineer support
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Tell us how you use the Nidec ABLE VRT: the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
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From enquiry to delivery
Send a part number or describe the application. Our engineers take it from there: the right product, a clear quotation, and delivery and support arranged.
- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
- 02An engineer reviews itWe check the specification and find the original part, a checked equivalent or a complete axis.
- 03Receive your quotationProducts, pricing, lead time and compatibility notes in one reply.
- 04Order and deliveryWhen you are happy, the order is placed and delivery and after-sales support are arranged.