EP Economic Line planetaire tandwielkastserie

The Korea Ever-Power Economic Line planetary gearbox family serves the large segment of Korean machine applications where angular backlash of 6 to 8 arcmin is perfectly adequate — conveyor systems, agitator drives, packaging machine auxiliary axes, material handling actuators, and general automation where a stepper motor or standard induction motor is the drive source. Eight product families address different output interface requirements within the 8 N·m to 459 N·m torque range, from the standard PE II inline series through the PN II micro series to the ISO 9409 flange PD series and the timing belt pre-configured PL series.

Economic Line products are not appropriate for closed-loop servo axes requiring sub-5-arcmin positioning, for precision register control, or for any application where backlash directly affects the quality of the output — for those applications, the Precision Line is the correct choice. Economic Line is the correct choice when the function of the gearbox is speed reduction and torque multiplication in a general-purpose drive, not precision positioning.

PE II

Standard economic inline series. Five frame sizes 50–155 mm body diameter. Square flange, solid output shaft. The most widely specified Economic Line product for Korean general automation and packaging machine auxiliary drives.

PG II

Widest ratio coverage — the only Economic Line inline series with a three-stage configuration reaching 120:1 to 1,000:1. Also the largest frame (160 mm) in the Economic Line inline range. Choose PG II when three stages or extreme ratios are required at economic cost.

PA II

Precision series frame scale — the PA II body diameters match those of the EP-AB precision series (042/060/090/115/142). Korean OEMs who need to offer both an Economic Line and a Precision Line option for the same machine interface use PA II for the economic variant without changing the motor adapter or mounting pocket dimensions.

PS II

Standard Economic Line inline series, covering the common 3/4/5/7/10 single-stage and 15–100 two-stage ratio set. Consult Korea Ever-Power for specific frame dimensions and motor adapter availability for PS II in your machine design.

PN II — Micro Series

The smallest frame in the Economic Line — body diameters from 17 mm to 56 mm. For Korean micro-automation, laboratory equipment, and small-format machine drives where the motor is compact and the available installation space is tightly constrained. PN II 017 at 17 mm body is the smallest planetary gearbox in the Korea Ever-Power catalogue.

PD / PDR — ISO 9409 Flange

The PD and PDR series use an ISO 9409 output flange — the international standard mounting flange common on rotary tables, indexers, and international machine tool components. Korean manufacturers integrating with international machine platforms that specify ISO 9409 flange mating specify PD/PDR for dimensional compatibility without custom adapter design.

PL / PLR — Timing Belt Pulley Pre-Configured

PL and PLR gearboxes come pre-configured with a timing belt pulley already installed on the output shaft — the motor and the PL gearbox form a direct belt-drive unit without additional pulley installation or alignment. For Korean machine builders building standard belt-driven axes at volume, PL eliminates the pulley installation step from the assembly process.

Conveyor and Material Handling — PE II / PG II, Stepper or Induction Motor

Korean general manufacturing conveyor systems — parts washing conveyors, component transfer belts, pallet indexers, small parts accumulation conveyors — pair with PE II or PG II Economic Line gearboxes driving standard induction or stepper motors. The 6 to 8 arcmin backlash of Economic Line has no functional impact on conveyor speed control; a conveyor does not reverse-load the gearbox in a way that makes backlash visible in the output. PE II 050 through PE II 120 cover the torque range of most Korean general factory conveyor head drives at economic cost. Pairs with CV joint drive shafts for conveyor shaft offset connections.

Agitator and Mixer Drives — PG II 3-Stage for High Ratio

Korean industrial mixing and agitation equipment — chemical mixing tanks, paint agitators, food blending systems, adhesive preparation systems — use PG II three-stage configurations for very slow agitator shaft speeds (1–10 rpm) from standard induction motors. The PG II's three-stage reach to 1,000:1 is unique in the Economic Line and directly serves large-ratio industrial agitator applications. Agitator fluid resistance acts as a load on the output shaft; the 6 to 8 arcmin backlash is entirely irrelevant to agitator shaft rotation speed control.

Packaging Machine Auxiliary Axes — PA II for Precision-Line Motor Adapters

Korean packaging machine builders designing cost-tiered product lines use PA II for lower-specification axes on the same machine where higher-specification axes use EP-AB Precision Line. Because PA II uses identical body diameters to EP-AB (042/060/090/115/142), the motor adapter and machine cavity pocket are shared between the PA II economic axis and the EP-AB precision axis — different specification, same installation interface. This allows a single machine design to support both an economic market version and a precision market version with one set of mechanical drawings.

Micro Automation — PN II at 17–56 mm Body

Korean medical device testing equipment, laboratory automation, small-format inspection machines, and miniature material handling systems requiring compact gearboxes with modest torque outputs use PN II micro series. The PN II 017 at 17 mm body diameter is the smallest planetary gearbox in the Korea Ever-Power range, making it applicable to space-constrained precision instruments that do not require sub-5 arcmin backlash — laboratory sample transport, medical device positioning, and optical equipment focus drives at light torque outputs.

International Platform Integration — PD ISO 9409 Flange

Korean machine builders integrating with European or international machine tool platforms that specify ISO 9409 rotary table and indexer flanges use PD for dimensional compatibility without custom adapter design. The ISO 9409 flange of PD matches the international standard bolt pattern and pilot diameter, allowing direct installation into existing machine tool rotary positions designed around the international standard. PD PDR right-angle covers the same interface requirement when a perpendicular motor mounting is required.

Agricultural Machinery and Outdoor Equipment — Cold Temperature Range

Korean agricultural machinery and outdoor industrial equipment requiring a low-cost gearbox for auxiliary functions — seed metering drives, spreader rate control, outdoor conveyor head drives on seasonal equipment — benefits from Economic Line's −10 °C lower temperature limit, which covers Korean outdoor early-spring and late-autumn field temperatures. Combined with agricultural bevel gearboxes for multi-output distribution, Economic Line provides the cost-appropriate primary reduction stage for Korean field machinery.

• ✔Backlash 6–8 arcmin (inline) / 10–12 arcmin (right-angle) verified per batch
• ✔PD/PDR ISO 9409 flange dimensions CMM verified against standard
• ✔PL/PLR timing belt pulley pre-mounting concentricity verified
• ✔IP65 ingress protection per IEC 60529 — every unit across all series
• ✔Material certificate and dimensional drawing with every delivery

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PA II 090 and EP-AB 090 on the same machine — our standard and premium packaging machine share the same motor adapter and mechanical drawings. The PA II goes into the film-drive axis on the standard model where ≤3 arcmin is not required; EP-AB P1 goes on the same axis in the premium model for faster film-change positioning. Korea Ever-Power confirmed the PA II and EP-AB 090 have identical mounting interfaces before we committed to the design. Manufacturing tooling was halved. 24 months, 35 standard machines and 12 premium machines, zero mounting fit issues between the two variants.

PG II R 120 three-stage, i=500 for a chemical agitator drive — 4 rpm target, 1,450 rpm induction motor, right-angle output due to motor clearance constraint in the tank top assembly. No other standard catalogue product we found offered 500:1 right-angle at economic cost in a single unit. PG II R three-stage covered it exactly. The 12 arcmin right-angle backlash is completely irrelevant to an agitator application. Cost was 40% lower than the precision series at equivalent torque. 30 months, 8 agitator tanks, zero drive failures. We now standardise PG II R three-stage across all our tank agitator drives where ratio > 100:1 is required.

PL 090 pre-configured belt pulley for a standard stepper motor belt axis on our automated storage retrieval shuttle. 120 units per year — the PL eliminating the belt pulley installation step saves approximately 8 minutes per unit in our final assembly, which across 120 units is 16 hours per year saved. The cost difference between PL and a bare PE II plus a separately sourced and installed pulley was negligible compared to the assembly time saving. The pre-mounted pulley alignment was within 0.02 mm runout on every unit we checked in the first batch. We switched from the bare gearbox approach to PL on all our standard stepper belt axes two years ago — no intention of switching back.

CV Joint Drive Shafts

For Economic Line conveyor head drives using PE II or PA II gearboxes where the conveyor shaft is offset from the gearbox output shaft, precision CV joint drive shafts connect the Economic Line output to the conveyor shaft without additional alignment procedures. Economic application cost is maintained on the gearbox side while the CV shaft handles the mechanical offset.

Worm Gear Reducers

For Economic Line vertical axis installations — vertical conveyors, elevator drives, vertical agitator shafts — where gravity load holding is required on motor power-off, a downstream self-locking worm gear reducer provides position holding without an electromagnetic brake. Economical worm stages matched to the Economic Line output torque range are available as part of the Korea Ever-Power transmission accessory range.

Agricultural Gearboxes

For Korean agricultural and post-harvest machinery applications using Economic Line as the primary reduction stage, downstream agricultural bevel gearboxes from Korea Ever-Power distribute the Economic Line output to multiple working heads. The combination of Economic Line cost positioning and the −10 °C lower temperature limit makes this pairing appropriate for field equipment and indoor post-harvest processing equipment alike.

QCan I use Economic Line with a closed-loop servo motor for position control?

Economic Line can be paired with a servo motor physically — the motor adapter system is compatible with common servo motor flange sizes. However, the 6 to 8 arcmin single-stage backlash means that in a closed-loop position control application, the effective positioning resolution at the output is limited by the backlash. At 6 arcmin (0.1°), a servo axis with an encoder on the motor cannot achieve position accuracy tighter than ±0.1° at the output without an output-side encoder. For most general automation position control applications where ±0.5° accuracy is adequate, Economic Line with a servo is functional. For precision register control, CNC axes, or any application requiring ≤0.05° accuracy, specify the Precision Line at P0 or P1 grade.

QWhich Economic Line series should I specify if I need the same mounting interface as the EP-AB Precision Line?

Specify PA II. The PA II body diameter scale matches EP-AB exactly — PA II 042, 060, 090, 115, and 142 mm body diameters are the same as EP-AB 042, 060, 090, 115, and 142. The motor adapter plate, gearbox mounting pocket dimensions, and output flange geometry are the same between PA II and EP-AB at each matching frame size. For machine designs offering both economic and precision variants, PA II on the economic variant and EP-AB on the precision variant share a single set of mechanical drawings.

QWhich Economic Line inline series offers a three-stage configuration with ratios above 100:1?

Only PG II (and its right-angle variant PG II R) offer a three-stage configuration in the Economic Line. PG II three-stage covers 120:1 to 1,000:1 reduction; PG II R three-stage covers the same range at right-angle output. No other Economic Line series — PE II, PA II, PS II, PN II — has a three-stage configuration. If your application requires a ratio above 100:1 at economic cost, PG II or PG II R is the only Korea Ever-Power Economic Line product that applies.

QIs the PD ISO 9409 flange compatible with international rotary table platforms?

PD is designed to the ISO 9409 flange standard, which is the widely adopted international standard for rotary table and indexer output interface dimensions. In principle, PD is dimensionally compatible with ISO 9409-compliant rotary table and indexer housings from any manufacturer following the standard. However, as with any standard interface, verify the specific PD frame size against the ISO 9409 size designation required by your rotary table platform — ISO 9409 has multiple size designations, and PD 053, 064, 090, and 110 correspond to specific size codes within the standard. Korea Ever-Power can provide the ISO 9409 size confirmation for each PD frame when requested.

QHow does Economic Line quality differ from Precision Line — is it lower quality manufacture?

Economic Line and Precision Line are manufactured under the same ISO 9001 quality management system, carry the same CE and KS certifications, and are produced in the same Korea Ever-Power manufacturing process. The difference is the gear manufacturing tolerance specification — Economic Line gears are manufactured to a wider tooth-mesh tolerance that produces 6 to 8 arcmin backlash, while Precision Line gears are manufactured to a tighter tolerance producing ≤1 to 5 arcmin. Both are manufactured to their own specification with full quality control. Economic Line is not a lower-quality product; it is a product manufactured to a different (wider) backlash specification appropriate for its application class, at a cost that reflects that specification.