ZL150 Winch Drive Planetary Gearbox — 1-5 Stage

A 100 t electric crane operating at 120,000 Nm continuous drum torque (75% of ZL150 rated) encounters a grab impact at 2.5x: transient torque = 300,000 Nm. The ZL150 absorbs this within its 355,000 Nm peak with 15% margin. The equivalent scenario on a 419W3 at 330,000 Nm continuous would require the gearbox to operate at 91% of rated during the transient — within limits but with less margin. The ZL150 electric platform provides greater transient headroom than the largest hydraulic model at a fraction of the weight.

The ZL150 cannot sustain 330,000 Nm for hours. Its continuous limit is 160,000 Nm. For AHTS anchor chain holding at 200,000-300,000 Nm for 6-14 hour weather standby periods, or for ultra-deep mining production winding at 200,000+ Nm sustained, the 4xxW mega-class (416W3 at 200,000 Nm through 419W3 at 330,000 Nm) remains the only option. The ZL150 replaces the mega-class for cyclic duty; it complements the mega-class for sustained duty.

The applications that genuinely require sustained torque above 160,000 Nm for hours represent perhaps 5-10% of the global winch market by unit volume — the largest AHTS vessels, the deepest mine shafts, and permanent mooring systems. The remaining 90-95% operate in cyclic duty where the ZL150 (or the ZL120, ZL95, ZL85 at lower torques) provides equal or superior performance to the 4xxW equivalent. The hydraulic mega-class will continue to serve its niche, but the niche is shrinking. Contact Kórea Ever-Power for an application-specific comparison between the ZL150 and the 4xxW mega-class.

Electric Mega-Class Crane Hoists (100-150 t SWL)

All-electric cranes at the largest SWL class where traditional mega-class hydraulic systems have been the only option. The ZL150 at ratio 80-200, 2-3 stage, with 800-1,200 kW motors at 5,000 rpm provides the hoist torque for 100-150 tonne lifts with the same transient headroom as the 419W3 hydraulic ceiling. The slewing drive a wheel drive complete the all-electric mega-class crane platform.

Electric AHTS and Offshore Winches (Cyclic Duty)

Electric AHTS main winches for anchor deployment and recovery where the operation is cyclic — deploy the anchor, hold briefly, recover, repeat — rather than the multi-hour sustained holding that requires the 4xxW mega-class. The ZL150 at 160,000 Nm continuous with 355,000 Nm peak provides the deployment torque and the anchor-setting shock absorption that the cyclic portion of AHTS operations demands. The auxiliary drives handle the tugger and guideline winches on the same electric vessel.

Electric Mining Main Production Winders (600-1,000 m)

Main production winders at mines with shaft depths of 600-1,000 metres where the combined skip, ore, and rope weight produces sustained drum torques up to 160,000 Nm. The ZL150 with 5,000 rpm input and 800-1,200 kW AC motors provides the winding torque with 20-35% regen energy recovery — eliminating the hydraulic infrastructure of the 414W3 and 415W3 while matching their continuous torque output.

Does the ZL150 make the 414W3 and 415W3 obsolete?

No. The 414W3 provides -40 deg C Arctic rating, FEM M6 certification, and 140,000 Nm sustained without time limit — capabilities the ZL150 does not offer. The 415W3 provides an integrated in-drum brake at 150,000 Nm — which the ZL150 does not have. For Arctic operations, for mining jurisdictions that mandate in-drum brakes, and for applications where the load exceeds 160,000 Nm sustained for hours, the 4xxW mega-class remains the correct specification. The ZL150 replaces the mega-class for the cyclic-duty majority, not the sustained-duty minority.

Why does the ZL150 minimum ratio (3.83) drop below the ZL95 and ZL120 minimums?

The ZL150 housing and gear module are large enough to accommodate a sun gear with a lower tooth count relative to the ring gear — producing a lower per-stage ratio at single stage. The 3.83 minimum means the ZL150 at single stage and 5,000 rpm motor produces an output speed of 1,305 rpm — effectively a near-direct-drive high-speed winch for fast cable deployment or rapid cargo transfer. This is the lowest minimum ratio in the entire ZL winch drive family and approaches the practical minimum for a planetary gear stage.

What percentage of the current global winch market can the ZL150 address?

Approximately 90-95% by unit volume. The applications that exceed the ZL150 envelope — sustained loading above 160,000 Nm for hours, Arctic -40 deg C, in-drum brake mandates — represent perhaps 5-10% of global winch drive unit sales. The remaining 90-95% operate in cyclic duty at torques between 870 Nm (smallest crane hoist) and 160,000 Nm (largest electric crane), with transient peaks up to 355,000 Nm — all within the ZL series range from ZL30 to ZL150.

What motor configuration is typical for a 120 t crane with the ZL150?

At ratio 100 with 700 mm PCD drum, 12-part reeving, SWL 120 t at 10 m/min: motor power approximately 1,000-1,200 kW at 3,500-5,000 rpm. A single high-speed PMSM motor (IEC 400-450 frame, 1,100-1,500 kg) provides this power through the ZL150 input shaft. The 5,000 rpm capability keeps the motor one IEC frame smaller than a 3,000 rpm equivalent. For the largest electric cranes, the single-motor electric architecture is simpler, lighter, and more reliable than the quad-hydraulic-motor Y-adapter configuration that the 4xxW mega-class requires.

How does the ZL150 compare to the ZL200 (the next and final ZL model)?

The ZL200 delivers 175,000 Nm continuous and an even higher peak — the absolute ceiling of the ZL series. The ZL150 at 160,000 Nm covers 90-95% of the torque range the ZL200 serves. Choose the ZL200 when the calculated drum torque consistently exceeds 160,000 Nm during loaded hoisting, or when the additional peak headroom provides meaningful safety margin for the most extreme transient events. For applications where the sustained torque stays below 160,000 Nm, the ZL150 is the more cost-effective selection.

What overhaul interval applies to the ZL150 at heavy electric crane duty?

The ZL150 is life-rated at 100,000 hours. At heavy crane duty (3,000-5,000 hours per year, 50-70% utilisation): target first overhaul at 25,000-30,000 hours. The larger gear module and housing mass at this torque level provide proportionally more thermal and fatigue margin than smaller ZL models, which typically extends the actual service life beyond the statistical target. Oil changes every 2,000 hours. Seal replacement at 10,000-15,000 hours. Bearing inspection at 15,000-20,000 hours. Gear set inspection at 25,000 hours. Contact Kórea Ever-Power for the maintenance schedule at your specific duty cycle.

120 t all-electric crane on a next-generation offshore construction vessel. ZL150 at ratio 100, 2-stage, 1,100 kW PMSM at 4,500 rpm. The crane specification originally called for a 414W3 mega-class with dual hydraulic motors. The ZL150 replaced the entire hydraulic winch drive system — gearbox, motors, HPU, cooler, reservoir, hoses — with a single gearbox and a single electric motor. Weight saving at the crane head: 940 kg. The 355,000 Nm peak absorbed the proof-load test at 150 t x 1.25 = 187.5 t equivalent drum torque without any VFD protection event. This vessel is the first in our fleet where the crane machinery room has no hydraulic oil. The fire risk assessment score improved by two categories.

Main production winder at an 850-metre copper mine. ZL150 at ratio 300, 3-stage, 900 kW AC motor at 4,200 rpm. The skip carries 22 tonnes; rope weight at full depth is 4,600 kg. Sustained drum torque during loaded hoist: 148,000 Nm — 93% of ZL150 continuous. The original specification was a 414W3 mega-class at 140,000 Nm, but the mine engineering team calculated that the 414W3 would have been operating at 106% of continuous during loaded hoist — marginal. The ZL150 at 160,000 Nm provides the continuous capacity the 414W3 could not quite deliver, plus 20-35% regen recovery that the hydraulic system did not offer. Annual energy saving: projected USD 420,000 at current electricity rates.

Main anchor handling winch on an all-electric AHTS vessel, ZL150 at ratio 180, 3-stage, dual 600 kW AC motors. The vessel completed its first anchor deployment at 1,200 metres depth — the cyclic portion (deploy, set, recover) worked flawlessly with the 355,000 Nm peak absorbing the anchor-setting impact. However, during a 6-hour weather standby with the anchor chain held at 140,000 Nm (88% of ZL150 continuous), the oil temperature reached 79 deg C — close to the 85 deg C limit in still air. We added a forced-air fan on the drum housing that reduced the temperature to 68 deg C. The 4-star reflects this thermal learning: for AHTS operations where holding periods exceeding 2 hours at near-rated load are expected, the external cooling must be sized for sustained duty, not cyclic. The ZL150 data sheet correctly states the Pt values — but the AHTS integration guide should emphasise that anchor holding is sustained duty, not cyclic, regardless of how the deployment and recovery phases are classified.