EP-FPG / EP-FPGA Series Economy Planetary Gearbox | Round & Square Housing

EP-FPG / EP-FPGA Series — Economy Planetary Gearbox

Servo-grade torque density at economy pricing. EP-FPG = round cylindrical housing  |  EP-FPGA = square housing. Identical internals — choose the housing shape your machine interface requires.

EP-FPG — Round (Cylindrical) Housing

Cylindrical outer housing — bolt flange at the output face only. Suits installation in a round bore or a custom machined housing. Common in compact equipment with circular motor pocket mounts.

EP-FPGA — Square Housing

Square outer housing with four-bolt mounting flange on the housing face. Direct bolt-down mounting to a flat machine surface. Common in general-purpose servo automation where a square footprint is preferred.

Economy Pricing — Servo Torque Density

The EP-FPG/FPGA delivers planetary gearbox torque density and efficiency (≥97% 1-stage) at a lower unit cost than premium series — by relaxing backlash, IP, lubricant, and cold-start specs that many applications don't require.

Two Housing Options

EP-FPG (round housing): fits round bores and cylindrical mounting pockets. EP-FPGA (square housing): four-bolt flat-mount to machine surfaces. Same internals — choose by housing interface.

Standard Motor Adapter System

Same clamp-ring motor adapter system as the EP-FAB/EP-FAD. Motor adapters validated for premium series are compatible with the corresponding EP-FPG/FPGA frame size.

≥97% / ≥94% Efficiency

Despite economy pricing, the planetary gear stage efficiency equals that of the premium series. Helical planet gears and profile-ground ring gear deliver low heat generation in the gear mesh.

Ratios 3:1 to 100:1

1-stage: i=3, 4, 5, 7, 10. 2-stage: i=15, 16, 20, 25, 30, 35, 40, 50, 70, 100. Covers the standard servo reduction range for most conveyor, pump, and general automation axes.

Any Mounting Direction

Horizontal, vertical, or inverted mounting without performance penalty. CASTROL LMX grease retains effective lubrication in any orientation within the 0°C–+90°C range.

EP-FPG/FPGA motor assembly using the standard clamp-ring adapter system

The EP-FPG and EP-FPGA use the same clamp-ring motor adapter assembly process as the EP-FAB — the standard 8-step procedure applies. Two points are specific to the FPG/FPGA economy series:

The EP-FPG and EP-FPGA are manufactured in the same Korea Ever-Power facility as the premium series, using the same CNC gear-grinding equipment. The quality process is condensed relative to the premium series, consistent with the economy-grade specification:

• ▸Profile-ground helical gears — same gear-grinding machines as premium series; gear quality is consistent
• ▸Backlash 100% inspection — every unit measured and verified against the ≤8 / ≤10 arc-min limit at 2% rated torque
• ▸Loaded run-in test — noise and vibration verified under load at rated speed before boxing
• ▸IP64 seal verification — dynamic seal interfaces tested before shipment; housing splash-protection verified

General Servo Axes

Conveyor indexing, rotary table positioning, material handling, and general machine axes where ≤8 arc-min backlash is sufficient and servo precision gearing is required.

Pump & Fan Drives

Servo-controlled pump and fan speed regulation where torque density and efficiency are the key requirements, and backlash does not affect the process. EP-FPG round housing fits cylindrical pump housings directly.

Packaging Indexers

Intermittent indexing drives in packaging machines where the index accuracy requirement is ±0.5 mm or coarser, operating in a 5°C–40°C indoor environment. Economy pricing reduces machine BOM cost.

AGV & Mobile Robots

Drive wheel gearboxes for AGVs and mobile robots operating in indoor warehouse environments (above 0°C). Compact size, round housing, and economy pricing suit high-volume AGV drivetrain applications.

Agricultural Machinery

Servo-driven precision seed metering, fertiliser spreading, and sprayer drives on agricultural robots. Economy pricing scales with the high unit count of agricultural automation systems.

Light Textile & Printing

Servo roll drives, feed axes, and registration drives in textile and narrow-web printing machinery where register accuracy is achieved via closed-loop control rather than low gearbox backlash.

When you need P0–P2 precision grades (≤1–5 arc-min), IP65, −10°C cold-start, 20,000 hr continuous duty, or torques above 423 Nm. Step up from EP-FPG to EP-FAB.

Round-flange high-speed premium series. 10,000 rpm, 30,000 hr, IP65, −10°C. For high-throughput continuous duty axes where the EP-FPG's 20,000 hr S5 life or 0°C limit is insufficient.

Further cost reduction for non-precise, right-angle, self-locking applications where planetary torque density is not needed. Lower efficiency than EP-FPG but self-locking is a key advantage.

Heavy-duty gearboxes for high-torque agricultural drive applications — PTO drives, header drives, and seeder gearboxes where planetary precision is not required.

Q: What is the difference between EP-FPG (round housing) and EP-FPGA (square housing)?

The only difference is the external housing geometry. EP-FPG has a cylindrical outer body — it fits directly into a round bore or circular mounting pocket machined into a machine frame or actuator body. EP-FPGA has a square outer body with a four-bolt mounting flange on the housing face, which bolts flat to a machine surface. The gear internals, motor input flange, output shaft, backlash, torque ratings, service life, IP, lubricant, and all other performance specifications are identical. Choose FPG for round-bore integration, FPGA for flat-face bolt-down mounting.

Q: Why is the minimum operating temperature 0°C instead of −10°C like the premium series?

The EP-FPG/FPGA uses CASTROL LMX grease, which has a lower pour-point viscosity performance than NYOGEL 792D at sub-zero temperatures. At 0°C, CASTROL LMX provides adequate lubrication for the gear mesh and bearings under the rated load and speed conditions. Below 0°C, oil film formation becomes unreliable, increasing gear wear risk. For applications in unheated facilities in Korean winters (which can reach −15°C), specify the EP-FAB or EP-FAD with NYOGEL 792D, which is rated to −10°C. Alternatively, install a gearbox pre-heat system if the EP-FPG/FPGA's other cost advantages are compelling.

Q: Can I use the same motor adapter I have for the EP-FAB on the EP-FPG?

Yes — the EP-FPG and EP-FPGA use the same clamp-ring motor adapter system (C1–C10) as the EP-FAB and EP-FAD. If you have a validated motor adapter for your servo motor on an EP-FAB of the same frame size, it will mount directly to the corresponding EP-FPG or EP-FPGA frame. This makes it straightforward to substitute the economy FPG for the premium FAB in high-volume production runs where the FPG's specifications are sufficient, without requiring new tooling or adapter development.

Q: Is IP64 adequate for an outdoor installation or washdown environment?

IP64 provides dust-tight protection (the "6") and protection against water splashing from any direction (the "4"). It is adequate for indoor environments with incidental water exposure — such as rain spray through an open door, condensation, or splash from a nearby process. It is not adequate for direct low-pressure water jet washdown (requires IP65), continuous outdoor rain exposure without shelter (requires IP65 minimum), or direct coolant flood on machining centres (requires IP65 or higher). For outdoor applications, the additional concern is the 0°C minimum temperature — Korean winters regularly go below 0°C outdoors. For any outdoor or coolant-flood application, specify the EP-FAB series (IP65, −10°C).

Q: What does the 20,000 hr S5 / 10,000 hr S1 life mean for my duty cycle?

S5 intermittent duty means the gearbox runs for a fraction of each cycle (ED ≤ 60% — load on for 60% or less of each cycle time, with the remainder at no load or low load). Under these conditions, the bearing L10 life is ≥20,000 hr. S1 continuous duty means the gearbox runs at rated load continuously without any rest period — in this case, the bearing L10 life reduces to ≥10,000 hr. For conveyor and indexing applications that run for 8–16 hours per day with regular stops, S5 typically applies and 20,000 hr is achievable. For 24/7 continuous servo axes at rated load, the 10,000 hr S1 rating means the gearbox should be replaced approximately every 4 years — acceptable for many economy applications, but if a longer continuous-duty life is needed, specify the EP-FAB (20,000 hr S1) or EP-FAD (30,000 hr S5).

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"We use the EP-FPG080 round housing on AGV drive wheels — the round housing fits directly into our machined wheel hub bore without any bracket. Running 3 shifts indoors at 15°C–35°C, 14 months without a single gearbox failure across a fleet of 80 AGVs."

"Replaced a worm gearbox with the EP-FPG040 on a servo-controlled precision seeder. Efficiency went from ~65% (worm) to >97% — the motor current dropped 38% at the same output torque. The size and weight difference was minimal; the energy saving over a 12-hour field day is substantial."

"The EP-FPG120 at i=25 drives our packaging indexer at 45 cycles/min, 10 hours/day, 5 days/week. Backlash of ≤8 arc-min is fine for our ±1 mm index tolerance. One note: we're in an unheated facility — in January we had to add a 15-minute warm-up routine before running because the gearbox starts stiff below 5°C."