ZR150 Winch Drive Planetary Gearbox — Right-Angle

At 3-stage ratio 100 with 355,000 Nm output: the bevel input torque during peak is approximately 3,550 Nm at 3,000 rpm. The bevel tooth contact stress briefly reaches 88% of the endurance limit — within the design target for sub-10-second transient events. The 3-stage architecture is essential here: at 2-stage, the bevel input torque at the same output would exceed the endurance limit. The additional planetary stage absorbs the first reduction, presenting the bevel with a manageable input torque even at the catalogue-exceeding 355,000 Nm peak.

Before the ZR150, achieving 160,000 Nm from a perpendicular motor required a separate right-angle adapter gearbox bolted between the motor and a coaxial 414W3 or 415W3 — adding 200-400 kg of weight, 150-250 mm of length, an additional oil bath, and a second set of seals and bearings to the installation. The ZR150 eliminates the adapter gearbox entirely — one product, one oil bath, one housing, one set of seals. The weight, complexity, and failure modes of the adapter are eliminated.

The intersection of "torque above mega-class entry" AND "perpendicular motor required" includes: athwartship marine winches above 100 t line pull, mine headframe winders at 700-1,000 m shaft depth, and retrofit crane conversions on platforms where 100+ t cranes have no axial depth for a coaxial motor. This intersection was previously unserved by a single integrated product. The ZR150 fills it. Contact Κορέα Ever-Power for installation-specific configuration.

The sustained drum torque stays below 160,000 Nm. The installation can accommodate 3-stage length (~480-550 mm) but not 4-stage (~560-650 mm). The 355,000 Nm peak provides adequate transient headroom. The application is a crane, marine winch, or mine winder where the duty is cyclic and the peak loads are the primary design driver rather than sustained capacity.

The sustained drum torque exceeds 160,000 Nm (even occasionally). The installation has depth for 4-stage. The additional 15,000 Nm of continuous headroom provides meaningful safety margin. The 130 kW thermal power (vs 105 kW) is needed for high-duty-cycle applications. The application is at the absolute ceiling of the electric winch drive catalogue.

Heavy Electric Crane Conversions Beyond Mega-Class (100-150 t)

Hydraulic-to-electric conversions on the largest offshore and harbour cranes (100-150 t SWL) where the original 414W3 or 415W3 hydraulic specification required mega-class torque AND the machinery room constrains the motor to a perpendicular mount. The ZR150 at 160,000 Nm exceeds both mega-class models from the right-angle geometry. The slewing drive και wheel drive complete the all-electric platform from the same supplier.

Heavy Marine Athwartship Winches Above 100 t Line Pull

Main anchor handling, towing, and permanent mooring winches on the largest AHTS vessels and FPSOs where the drum runs athwartship and the sustained line pull exceeds 100 tonnes. The ZR150 at 160,000 Nm provides the holding and deployment torque from a right-angle motor that sits within the vessel hull structure. The 355,000 Nm peak absorbs the extreme chain snap and towline failure loads that define the safety envelope for these vessel classes.

Deep Electric Mining Winders on Constrained Headframes

Main production winders at mines with 700-1,000 metre shafts where the sustained drum torque exceeds 140,000 Nm — beyond the 414W3 mega-class — and the headframe geometry requires a perpendicular motor. The ZR150 at 160,000 Nm with 800-1,200 kW motors at 3,000 rpm provides the winding torque with regen recovery. For mine electrification programmes at depths where the 414W3 was the only previous option, the ZR150 is the electric alternative with 14% more continuous capacity.

Can the ZR150 bevel stage reliably handle the 355,000 Nm peak over the full design life?

Yes. At 3-stage ratio 100, the bevel input torque during the 355,000 Nm peak is approximately 3,550 Nm — reaching 88% of the bevel tooth endurance limit for a sub-10-second transient. The 20CrMnTi bevel gears withstand this stress at the expected frequency of peak events (typically 5-50 per day for crane duty, 1-10 for marine winch duty) without cumulative fatigue damage. The bevel tooth fatigue analysis accounts for 100,000 hours of operation at the expected peak-event frequency — the design is verified at the system level, not just the single-event level.

Does the ZR150 replace the adapter-gearbox-plus-414W3 combination entirely?

For cyclic electric duty: yes. The ZR150 integrates the 90-degree turn and the mega-class torque in one product — eliminating the separate adapter gearbox (200-400 kg), its oil bath, its seals, and its maintenance. For sustained hydraulic duty above 160,000 Nm, the adapter-plus-414W3 or larger 4xxW combination remains the correct specification because the ZR150 cannot sustain above 160,000 Nm.

Does the ZR150 share planetary spare parts with the ZL150?

Yes — identical to all other ZR/ZL pairings. The planetary stages are fully interchangeable between ZR150 and ZL150. Only the bevel stage and input housing differ. Fleet operators benefit from shared planetary inventory across both architectures — critical for vessel operators running ZR150 deck winches and ZL150 crane hoists on the same platform.

What motor frame is typical for a 120 t marine winch with the ZR150?

At ratio 100 with 700 mm PCD drum, 12-part reeving, 120 t line pull at 8 m/min: motor power approximately 1,000-1,200 kW at 3,000 rpm. IEC 400-450 frame, approximately 1,300-1,800 kg. The perpendicular motor mount places this weight on the vessel deck structure beside the winch — typically on a dedicated motor foundation that distributes the weight to the hull structure. For AHTS vessels, the motor foundation is integrated into the stern structure during new-build — no additional structural weight.

What overhaul interval applies to the ZR150 at heavy marine duty?

Marine service: first overhaul at 20,000-25,000 hours. The 3-stage architecture provides more even wear distribution than the 2-stage ZR55-ZR95 models — all gears and bearings approach their inspection intervals simultaneously rather than the bevel leading the wear curve. Oil changes every 1,500 hours in marine service. Oil sampling every 500 hours — monitoring iron particle counts across both bevel and planetary meshes. Contact Κορέα Ever-Power for the marine-specific maintenance schedule at your vessel class.

Main anchor handling winch on a 100 m all-electric AHTS, ZR150 at ratio 150, 3-stage, dual 600 kW AC motors at 3,000 rpm. The drum runs athwartship — no coaxial option exists at this torque level without the adapter gearbox that we eliminated. The ZR150 is the first production AHTS winch to exceed the 414W3 mega-class continuous from a right-angle electric drive. The vessel completed its first ultra-deepwater anchor deployment at 2,500 metres — the highest-torque right-angle electric winch operation performed to date. The 355,000 Nm peak absorbed the anchor chain snap-load during the proof test without VFD intervention. Regen recovery during chain recovery: 22%. The vessel operator has stated this is the baseline specification for their next 3 AHTS newbuilds.

Main production winder at a 920-metre copper-cobalt mine, ZR150 at ratio 320, 4-stage, 1,000 kW AC motor mounted vertically. The skip carries 22 tonnes; rope weight at full depth 5,200 kg. Sustained drum torque: 152,000 Nm — 95% of ZR150 continuous and 9% above the 414W3 capacity (140,000 Nm). This mine could not have been served by the 414W3 — the torque requirement exceeded the mega-class entry point. The ZR150 was the only right-angle product at this torque level. Regen recovery: 28% of hoist energy, projected annual saving USD 490,000. The winder has completed 7 months of production at 320 cycles per day without any unscheduled downtime.

120 t offshore crane conversion from 414W3 hydraulic to ZR150 electric. The machinery room offered 510 mm behind the drum — insufficient for a coaxial ZL150 but adequate for the ZR150 at 3-stage (installed depth 495 mm). The ZR150 replaced the 414W3 with 14% more continuous capacity — the classification society approved the upgrade without derating. Regen recovery: 20% over 5 months. The 4-star reflects a procurement lead time observation: the ZR150 at this torque level required a 14-week lead time from order to delivery — 4 weeks longer than the ZR75 at a previous project. For large-scale fleet conversion programmes with multiple ZR150 units, placing frame orders 6 months ahead of the scheduled installation window would prevent the lead time from affecting the conversion schedule.