EP-AH / EP-AHK Series New Line Heavy-Duty Planetary Gearbox

Ang EP-AH/AHK New Line heavy-duty planetary gearbox series covers the torque and frame size range above the Korea Ever-Power precision inline series, with single-stage backlash of 1 to 2 arcmin and up to four gear stages providing reduction ratios from 4:1 to 10,000:1. The inline EP-AH series and the right-angle EP-AHK series — including the AHKA, AHKB, and AHKC variants — share the same New Line architecture, spanning eight frame sizes from 064 mm to 450 mm body diameter. Operating temperature is −10 °C to +90 °C with IP65, the same range as the precision planetary series.

For applications requiring precision drive performance above 3,805 N·m — where the EP-AFH ultra-precision series maximum is exceeded — New Line provides the Korea Ever-Power product that covers this torque tier at 1 to 2 arcmin single-stage backlash, without moving to an entirely different product family.

The Korea Ever-Power range comprises three tiers. The Precision Line (AB, AF, AFH, AFR, and related series) achieves P0 ≤1 arcmin backlash but is limited to 3,805 N·m maximum output torque at up to 240 mm body diameter. The Economic Line (PE II, PG II, and related series) covers up to 459 N·m with 6 to 8 arcmin single-stage backlash. Between these two tiers, New Line fills the torque gap — from 24 N·m up to 9,585 N·m, with 1 to 2 arcmin single-stage backlash, in body diameters up to 450 mm.

EP-AH — Inline (Coaxial) New Line

Motor input and output shaft share a common axis — the same inline geometry as EP-AB, EP-AF, and EP-AFH, scaled up to the New Line torque range. When the application can accommodate an inline drive arrangement and requires torques above 3,805 N·m or frame sizes above 240 mm, EP-AH is the Korea Ever-Power inline product for that tier.

EP-AHK / AHKA / AHKB / AHKC — Right-Angle New Line

The right-angle variants of New Line — AHK (two-stage), AHKA (three-stage, high-torque start), AHKB (three-stage, wide torque range), AHKC (additional configuration) — provide 90-degree output direction at New Line torque and frame size levels. This is the right-angle counterpart to AH, serving heavy industrial applications where a perpendicular motor arrangement is required at torques above the precision right-angle series limit.

Steel Plant Large Rotary Tables — AH355/AH450, Above 3,805 N·m

Korean integrated steel mills and special steel producers use large-diameter rotary tables — 3 m to 6 m diameter — for positioning steel billet and slab loads in the 20–200 tonne range. The table drive torque required at this scale exceeds 4,000 N·m, beyond the precision series ceiling. EP-AH355 and EP-AH450 New Line fill this tier, delivering the required output torque with 1 to 2 arcmin backlash sufficient for positioning billets to the ±0.1 mm tolerance typical of Korean slab indexing operations. The −10 °C lower temperature limit also covers Korean mill buildings in winter. Paired with heavy-duty CV drive shafts for dual-motor table drive configurations.

Shipbuilding Assembly Positioners — AHK Large Right-Angle

Korean shipyard block assembly operations require large positioner drives for rotating ship block segments — hull sections up to 200 tonnes — during welding and outfitting operations. The positioner drive torque exceeds the precision series maximum; the motor must be positioned perpendicular to the block rotation axis due to structural clearance requirements. EP-AHK right-angle configurations at AHK200 and AHK255 cover the torque levels typical of Korean shipyard block positioner drives, with the 1 to 2 arcmin backlash sufficient for welding position accuracy.

Mining Conveyor Drives — AH200/255, High-Torque Moderate Ratio

Korean mine conveyor head drives and transfer conveyor drives require high output torques in the 3,000–8,000 N·m range at moderate reduction ratios (two-stage configurations). EP-AH200 and EP-AH255 New Line serve this application range — with the −10 °C lower temperature limit covering underground mine environments in Korean winter, and the 1 to 2 arcmin backlash providing adequate position control for conveyor speed regulation. The New Line cost positioning against the precision series is particularly relevant for bulk mining equipment where P0 precision is not required.

Wind Turbine Yaw and Pitch — AH/AHK Multi-Stage

Korean offshore and onshore wind turbine yaw drive systems — rotating the nacelle to track wind direction — require high torques at very high reduction ratios (typically 10,000:1 and above from a standard motor) at a 90-degree output direction. EP-AHK multi-stage four-stage configurations cover the yaw drive torque and ratio range for Korean wind turbines in the 3–8 MW class, with the New Line 1 to 2 arcmin backlash sufficient for yaw positioning accuracy. The −10 °C lower temperature limit covers Korean offshore winter conditions. Integration with worm gear reducers for additional holding torque in pitch control applications.

Heavy Press Brake Back Gauge — AH140/200 High Precision Alternative

Korean heavy press brake machines processing thick structural steel (40–80 mm) require back gauge positioning drives with high torque capacity and adequate backlash for ±0.5 mm positioning accuracy. EP-AH140 and EP-AH200 New Line provide the torque and size range for heavy press back gauge drives at New Line cost, where the precision series P1 specification would be over-specified for the actual positioning requirement. Korean press brake OEMs building cost-competitive machines for general structural steel markets find New Line appropriate for this application where sub-2-arcmin precision is sufficient.

Agricultural Machinery — Large Tillage Equipment Drives

Korean large-scale agricultural tillage equipment — deep tillage machines, combination seed-bed preparation implements — operating on large Korean farms requires drive units at the upper torque range of agricultural gearboxes. EP-AH110 and EP-AH140 New Line bridge the gap between standard agricultural gearbox torque levels and heavy industrial precision drives, providing adequate torque at −10 °C for Korean early-spring field operations. Combined with agricultural bevel gearboxes for multi-output distribution to multiple tillage heads across the implement working width.

• ✔New Line backlash (1–2 arcmin range) verified per unit and per batch — frame-specific value confirmed on delivery documentation
• ✔Full-load torque test at rated output — mandatory for high-torque AH285, AH355, AH450 frames
• ✔Multi-stage efficiency verified per stage count configuration
• ✔IP65 ingress test per IEC 60529 — every unit
• ✔Material certificate and dimensional drawing with every delivery

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CV Joint Drive Shafts

For large-diameter rotary table dual-drive configurations — two EP-AH units driving a table from opposite sides — and for New Line installations where the output shaft must reach an offset load point in heavy industrial equipment, precision heavy-duty CV drive shafts transmit high torques through offset and angular misalignment in the severe conditions of Korean heavy industry environments.

Worm Gear Reducers

For vertical EP-AH/AHK installations in heavy crane hoists, vertical column press drives, and wind turbine pitch drives requiring gravity load holding on power-off, heavy-duty self-locking worm gear reducers downstream of New Line provide position holding without electromagnetic brakes. Heavy-duty worm stages rated for the New Line output torque are available from Korea Ever-Power.

Agricultural Gearboxes

For large-scale Korean agricultural machinery where EP-AH New Line provides the primary heavy-duty reduction stage and downstream agricultural bevel gearboxes distribute power to multiple working implements, Korea Ever-Power's agricultural bevel stages are rated for the −10 °C lower temperature applicable to field agricultural equipment and scaled to match New Line output torque at the transfer point.

EP-AH355 two-stage for the 4 m diameter slab tilting table at our continuous casting line — required 7,200 N·m, which was above every precision series maximum we found. EP-AH New Line was the first product in the Korea Ever-Power range that covered the torque. The 1.4 arcmin backlash measured on delivery was well within our ±0.15° positioning requirement. Korea Ever-Power's team provided the dimensional drawing for AH355 within two working days of our enquiry, and confirmed a 10-week lead time that fit our plant shutdown schedule. 18 months, two tables, daily slab rotation cycles, no issues.

EP-AHKA255 three-stage for wind turbine nacelle yaw drives on our 4.5 MW turbine design — required 5,800 N·m at 1,800:1 right-angle output. No precision series product covered both simultaneously. AHKA three-stage right-angle covered both at New Line cost. The 1.8 arcmin backlash measured at delivery was within yaw system tolerance. More importantly, the −10 °C lower temperature limit was critical — our Jeollanam-do coastal site sees −8 °C in January. Korea Ever-Power application team confirmed the AHKA255 configuration and ratio combination before order. Deployed on 12 turbines across two wind farm phases over 28 months without a single yaw drive failure.

EP-AH200 two-stage for the back gauge drive on our 650-tonne heavy structural press brake. We had been specifying EP-AB P1 for back gauge drives across our product range, but for the 650T model the required torque and the P1 grade together were adding significant cost. The Korea Ever-Power team suggested evaluating EP-AH200 New Line — same torque capacity but New Line cost positioning. The 1.6 arcmin backlash vs the EP-AB P1 ≤3 arcmin was actually better precision for our application. We have now migrated our 500T and 650T models to New Line, saving on BOM cost per machine while improving backlash. 14 months, 8 machines delivered, no back gauge accuracy complaints.

QMy torque requirement is 4,500 N·m. The precision series maxes at 3,805 N·m. Is New Line the only option?

Yes — for a standard catalogue Korea Ever-Power planetary gearbox at 4,500 N·m output torque, the New Line EP-AH series is the only option. The precision series (AB, AF, AFH, and their right-angle variants) all have a maximum below your requirement. New Line EP-AH at the appropriate frame size for 4,500 N·m will provide 1 to 2 arcmin single-stage backlash — confirm the specific frame recommendation and the achievable backlash value with the Korea Ever-Power Korean application team before finalising your specification.

QThe specification says "1 to 2 arcmin" for single-stage New Line backlash. Can I get a guaranteed ≤1.5 arcmin?

The 1 to 2 arcmin range reflects the variation across the frame size range — not a tolerance band on a single unit. Larger frames in the New Line tend toward the lower end of this range. For a specific frame size, Korea Ever-Power can confirm the typical backlash value and whether a tighter guarantee than the stated range is achievable for your configuration. If a guaranteed ≤1 arcmin specification is the firm requirement regardless of torque level, the precision series at P0 grade is the correct product — New Line's backlash specification cannot be contractually guaranteed at ≤1 arcmin.

QMy required torque is 2,000 N·m. Is New Line or the precision series more appropriate?

At 2,000 N·m, you are within the precision series capability — the EP-AFH240 reaches 3,805 N·m, and EP-AFR220/EP-AF220 reach 2,000 N·m. The choice depends on your backlash requirement: if ≤1 arcmin (P0) or ≤3 arcmin (P1) precision is the specification, stay with the precision series. If 1 to 2 arcmin is acceptable and cost reduction is a priority, evaluate New Line at the equivalent frame size — it may provide the same functional performance at lower cost. Contact the Korea Ever-Power team with your torque, ratio, and backlash requirement for a direct comparison.

QDoes New Line use the same motor adapter plates as the precision series?

The motor adapter plate system of New Line is designed for the same servo and induction motor flanges as the precision series at comparable frame sizes. For Korean machine builders who have standardised on specific servo motor models with precision series gearboxes, the same motor model should be adaptable to New Line at the equivalent frame size without a separate adapter design. Confirm the specific adapter availability for your motor model and New Line frame size with Korea Ever-Power before specifying.

QWhat is the difference between AHK, AHKA, AHKB, and AHKC right-angle variants?

The AHK variants follow the same multi-stage architecture as the AFHK precision right-angle series: AHK is the two-stage right-angle configuration, AHKA is the three-stage variant optimised for high-torque output starting points, AHKB is the three-stage variant covering a wider torque range from a lower minimum, and AHKC is an additional configuration covering specific application requirements within the three- and four-stage range. The selection logic mirrors the AFHK family: determine your required output torque and maximum reduction ratio, then identify which AHK configuration covers both. Korea Ever-Power's application team provides direct configuration recommendations for AHK/AHKA/AHKB/AHKC selection based on your torque, ratio, and frame size inputs.