EP-FADS Series Adapting-Flange High-Speed Planetary Gearbox | Direct Motor Mount

EP-FADS Series — Adapting-Flange High-Speed Planetary Gearbox

Motor shaft inserts directly into the gearbox input bore — no adapter plate, no clamp ring, minimum axial length. Round output flange, 10,000 rpm, 30,000 hr design life.

EP-FAD / EP-FADR — Clamp-Ring Adapter

Motor shaft is clamped via a separate adapter plate and clamp ring. Universal — fits any servo motor flange. Adds 15–30 mm to the axial stack length.

EP-FADS — Adapting Flange (Direct Insert)

Motor shaft inserts directly into a precision-bored input flange machined to the motor's exact shaft diameter. No separate adapter plate. Shortest possible axial dimension.

The EP-FADS uses the same proven high-speed planetary gearset as the EP-FAD — DIN 5 profile-ground helical gears, 30,000-hour bearing life, NYOGEL 792D lifetime lubrication, IP65 sealing, and a circular round output flange. The single change is at the input: instead of a clamp-ring adapter plate, the gearbox input housing is machined with a precision-bored adapting flange that receives the motor shaft directly.

This direct-insert design eliminates the adapter plate thickness (typically 15–30 mm), stiffens the input shaft support, and removes a bolted joint from the torque path. The trade-off is that the input bore is sized for a specific motor shaft diameter — so the motor model is effectively committed at the time of order.

• ◈Shortest axial length in the EP-FAD family — up to 30 mm shorter than EP-FAD with adapter
• ◈Eliminates the adapter plate bolted joint — one fewer potential misalignment source
• ◈Stiffer input shaft support — higher permissible input-side axial and radial force
• ◈Same round output flange, 30,000 hr life, and 10,000 rpm capability as EP-FAD
• ◈Special ratios i=16, 21, 31, 61, 91 available in selected frame sizes

EP-FADS: direct-insert adapting flange input, round output flange

Direct-Insert Adapting Flange

Motor shaft inserts directly into a precision-bored input flange — no clamp ring, no adapter plate. Eliminates one bolted joint from the torque path and reduces axial stack length by up to 30 mm.

Round Output Flange

Identical circular bolt-circle output flange to the EP-FAD. Bolt-circle diameter D1 from 12 mm (EP-FADS047) to 100 mm (EP-FADS255), matching mainstream rotary table and actuator body interfaces.

30,000-Hour Design Life

Same upgraded bearing selection and lubrication geometry as the EP-FAD platform. 30,000-hour L10 calculated bearing life under rated conditions — equivalent to roughly 15 years of two-shift operation.

Special Ratios i=16/21/31/61/91

Five non-standard ratios for semiconductor pitch-matching and FPD transport speed applications — available in EP-FADS064 through EP-FADS255. Same special-ratio availability as the EP-FAD, up to i=91.

Higher Input Axial Force Rating

The direct-insert input bore provides stiffer shaft support than a clamp-ring adapter, raising the permissible input axial force (F_ax_in) — up to 12,500 N at EP-FADS255 1-stage. Valuable for vertical-axis direct-mount configurations.

DIN 5 Profile-Ground Gears

Same 5-axis CNC profile-ground helical planetary gearset as the EP-FAD. Efficiency ≥97% (1-stage), ≥94% (2-stage) — identical to the EP-FAD, superior to the bevel-output EP-FADR.

EP-FADS direct-insert input flange and round-output-flange dimensions

Because the EP-FADS uses a direct-insert input bore instead of a clamp-ring adapter plate, the assembly process differs from the EP-FAD at the input end. The output end (round flange) mounts identically to the EP-FAD.

Ultra-Compact Semiconductor Axes

Wafer stage theta-axis and die bonder rotary axes where every millimetre of axial length matters. Removing the adapter plate frees space for encoder cables and sensor routing inside the stage housing.

FPD Glass Transport

Glass panel transfer robot joints where special ratios i=21/31 match substrate pitch exactly and the direct-insert input eliminates one potential run-out contributor in the drive chain.

Space-Constrained CNC Axes

4th/5th axis rotary tables where the overall package depth is limited by the machine column clearance. The FADS's shorter axial length can make the difference between fitting inside or outside the column envelope.

Slim-Profile Robot Joints

Collaborative robot (cobot) joints where the link profile must remain within a narrow cross-section for human-robot workspace sharing. Direct-insert input reduces joint axial length and arm reach-to-payload ratio.

Vertical Load-Holding Axes

The higher input axial force rating (F_ax_in up to 12,500 N) suits vertical servo axes where the motor weight rests on the gearbox input shaft — a configuration that can overload the input bearing of a clamp-ring adapter gearbox.

Medical & Lab Automation

Sample handling robot joints and diagnostic instrument axes where the direct-insert design reduces the part count in the drive chain and eliminates the adapter plate as a potential particulate shedding surface near clean areas.

Clamp-ring adapter input, round flange output. Choose when motor model is not fixed or may change during the machine's lifecycle. Ratios up to i=100.

Round flange + 90° right-angle output. When a right-angle drive is needed alongside the round-flange interface, choose the FADR over the FADS.

Square-flange inline gearbox with clamp-ring adapter. For applications where a square-flange interface is standard and the lowest P0 backlash (≤1 arc-min from EP-FAB042) is the priority.

Constant-velocity couplings for connecting EP-FADS round-flange output to articulating or misaligned load shafts in robot joints and AGV drivetrains.

Q: What happens if I need to change the motor after I've ordered the EP-FADS?

If the new motor has the same shaft diameter, the EP-FADS can be reused directly. If the shaft diameter is different, the adapting-flange input housing must be remachined or replaced — this is the primary constraint of the direct-insert design. For applications where motor model changes are expected (for example, during prototyping or in machines with frequent motor upgrades), the EP-FAD with a clamp-ring adapter is the more flexible choice. For high-volume production with a fixed BOM, the EP-FADS's shorter axial length and simpler assembly process typically outweigh this limitation.

Q: Why is the maximum ratio 91 instead of 100 like the EP-FAD?

The adapting-flange input housing is slightly longer axially than the standard EP-FAD input end, which constrains the 2-stage planetary arrangement inside the housing to a maximum ratio of i=91. The standard EP-FAD uses a thinner adapter plate at the input, leaving more room for the 2-stage gear arrangement to achieve i=100. If i=100 is required alongside a round-flange output, specify the EP-FAD with a standard clamp-ring adapter ring for your motor model.

Q: How much shorter is the EP-FADS compared to the EP-FAD with a clamp-ring adapter?

The axial length reduction depends on frame size and which motor adapter is being compared. For EP-FADS090, the direct-insert input housing is approximately 15–25 mm shorter than the EP-FAD090 with a standard clamp-ring adapter plate. For larger frames (EP-FADS200/EP-FADS255), the saving can reach 25–35 mm. The full dimension tables (L1–L18, H1) are available in the Korea Ever-Power catalog drawing for each frame size — request the FADS drawing package when placing your enquiry.

Q: Why is the input axial force rating higher on the EP-FADS than the EP-FAD?

In the EP-FAD, the motor shaft connects to the gearbox through an adapter plate and clamp ring. The adapter plate introduces a small radial overhang and a bolted joint that limits how much axial force the input bearing can sustain before deflection occurs. In the EP-FADS, the motor shaft is supported directly inside the precision-bored adapting flange, which is much stiffer — essentially a close-fitting sleeve bearing at the input. This stiffer support raises the permissible input axial force, which is particularly useful in vertical-axis configurations where the motor's own weight (plus any belt tension if applicable) acts as an axial load on the input bearing.

Q: Can I specify a key or keyway in the input bore?

Yes. The adapting-flange input bore can be machined with a standard key slot (DIN 6885) to match a keyed motor shaft. Specify the key dimensions when ordering. For smooth (keyless) motor shafts, a friction-fit or locking-collar retention is used instead. Note that for high-cycle, high-torque reversing applications, the keyed connection is preferred — keyless friction retention can experience micro-slip over time under repeated torque reversal. Confirm the connection type with your application requirements when placing the order.

"

"Used EP-FADS200 at i=21 (special ratio) for a large FPD glass transfer robot. The adapting-flange input removed 28 mm from the joint stack and the i=21 special ratio matched our transport pitch exactly — no software correction factor needed. Motor is a fixed Yaskawa model across our entire machine range, so the committed bore is not a constraint."

"Our collaborative robot joint needed to fit inside a 95 mm diameter link cross-section. EP-FADS064 at i=16 was the only option in its torque class that fit — the direct-insert input saves 18 mm vs the clamp-ring equivalent. After 10 months of 24/7 operation, zero backlash growth."

"EP-FADS110 on a vertical servo axis with the motor mounted above the gearbox. The higher F_ax_in rating (1,525 N vs ~800 N on the clamp-ring equivalent) safely carries the motor weight as axial input load. One note: confirm shaft diameter carefully — we had to re-order one unit after a motor change. Factor lead time into your schedule for first orders."