415W3 Winch Drive Planetary Gearbox Reducer

150,000 Nm
Internal brake. No external dependency.

The EP-415W3 exists because some safety frameworks will not accept a winch drive planetary gearbox without an internal mechanical hold — regardless of how robust the external braking system is. When the regulator says "the brake must be inside the drum," the 415W3 is the mega-class answer.

Mine Safety: "Inside the Drum"

Several mining jurisdictions (South Africa DMR, Australian state mining acts, Chilean SERNAGEOMIN) require personnel winders and production hoists to have a mechanical brake physically located within the drum assembly — not on the motor, not in the hydraulic circuit, not on an external calliper. The rationale: if the motor detaches, if the hydraulic lines sever, or if the electrical power supply fails completely, the load must still be held by a mechanism that is mechanically inseparable from the drum. The 415W3 integral brake satisfies this requirement where the 414W3 cannot.

Offshore Class: "Independent Hold"

Certain offshore crane classifications require an independent mechanical hold within the hoist drum for lifts exceeding specific weights or heights above water. The 415W3 integral brake counts as one of the required independent braking mechanisms — and being inside the drum means it operates even if the crane hydraulic power unit loses all pressure simultaneously. For heavy-lift vessels performing 100+ tonne lifts where a dropped load can puncture the hull, the internal brake is the last barrier between a controlled hold and a catastrophic failure.

Insurance: "Belt and Braces"

Insurance underwriters for high-value lifts (bridge sections, reactor vessels, offshore modules worth tens of millions) increasingly require a "belt and braces" approach: external braking PLUS an internal gearbox brake, each independently capable of holding the full suspended load. The 415W3 satisfies the "braces" half of this requirement. The 100 kg and the additional cost of the brake assembly are negligible compared to the cargo value and the premium reduction that the enhanced braking configuration provides on the lifting insurance policy.

Choose the 414W3 when:

Arctic operations require -40 deg C. External braking architecture is already classification-certified. AHTS chain stopper + motor brakes provide all required holding. The 100 kg weight saving matters for vessel stability. The applicable standard does not require an in-drum brake.

Choose the 415W3 when:

The applicable mining or offshore standard mandates an in-drum brake. The insurance underwriter requires belt-and-braces braking. The winch must hold the load after complete hydraulic and electrical failure. The 10,000 Nm additional torque (150 vs 140k) provides useful margin. Operating temperatures remain above -25 deg C.

Regulated Mining Production Winders

Main production hoists at mines where the safety authority explicitly requires an in-drum brake. The 415W3 satisfies this mandate while delivering FEM M6 production winding capacity — 300-500 skip cycles per day at 15-25 tonne payloads through shafts of 500-1,000 metres. The internal brake serves as the "last-resort hold" in the multi-level braking hierarchy that mine winding regulations require: motor brake (primary), counterbalance valve (secondary), and gearbox brake (tertiary/emergency).

Heavy-Lift Vessel Main Hoists (60-100+ t SWL)

Main crane hoists on semi-submersible heavy-lift vessels and derrick pipe-lay vessels handling 60-100+ tonne lifts at heights of 30-80 metres above the waterline. The 415W3 internal brake provides the independent mechanical hold that classification societies (DNV, BV, ABS) require for these ultra-heavy lifts. The slewing drive handles the crane rotation and the track drive powers the vessel ballast and positioning systems.

Insured High-Value Lifts

One-off or infrequent lifts of extremely high-value cargo — nuclear power plant components, offshore platform topsides, bridge superstructures, refinery reactor vessels — where the cargo value exceeds USD 10 million and the lifting insurance policy requires documented proof of multi-level braking redundancy. The 415W3 internal brake provides the documented third braking tier that underwriters increasingly require for coverage at favourable premium rates.

What is the brake holding torque at the drum for the 415W3 at mid-ratio?

The specific brake Nm rating is application-configured at order based on the drum diameter, maximum load, and regulatory safety factor requirement. At a representative mid-ratio of 190, with a brake in the range common for this housing class: the drum holding torque reaches values sufficient to hold 80-120 tonnes on a 600-800 mm PCD drum with safety factors exceeding 2.0. Contact เกาหลี เอเวอร์พาวเวอร์ with the specific application parameters for a verified brake holding calculation.

Can the 415W3 operate at -40 deg C like the 414W3?

Not as standard. The 415W3 is rated to -25 deg C. The internal brake introduces additional cold-temperature challenges: brake disc friction coefficient varies with temperature, the hydraulic release oil in the rotary union becomes viscous, and the Belleville spring force changes slightly at extreme cold. These effects are manageable at -25 deg C but would require specific cold-weather validation testing at -40 deg C. If Arctic operation with an internal brake is required, contact Korea Ever-Power for a custom -40 deg C validation programme for the 415W3.

How does the 415W3 internal brake interact with the external braking system?

The 415W3 brake is a spring-applied, hydraulically released parking brake — it engages when release pressure is removed and holds when engaged. The external braking system (motor brake, counterbalance valves) operates independently through the hydraulic circuit. During normal operation, the 415W3 brake is released (pressurised) and the external system provides all dynamic control. During parking, both the 415W3 brake and the motor brake engage simultaneously. During an emergency (total hydraulic failure), only the 415W3 spring-applied brake engages — because it requires no hydraulic pressure to hold, unlike the motor brake which needs pilot pressure to maintain engagement on some motor designs.

What brake disc inspection interval applies at FEM M6 production mining duty?

Every 1,500 hours. At 300-500 cycles per day, each cycle involves one brake engagement (from hold to release) and one brake re-engagement (from release to hold). The engagement events produce the majority of disc wear. Expected disc stack replacement at 8,000-12,000 hours depending on the engagement speed (dynamic vs near-static). The rotary union seal should be inspected simultaneously — replace when external leakage exceeds 10 drops per minute. For mines with shift-based maintenance windows, schedule the brake inspection to coincide with the oil sampling interval (every 500 hours) to minimise production interruption.

Does the 100 kg weight increase from the 414W3 affect vessel stability calculations?

On offshore vessels, the 100 kg increase is accounted for in the winch drum weight on the vessel weight report — typically located at or near the main deck level where the moment arm to the vessel centre of gravity is short. The stability impact is negligible for vessels above 5,000 DWT. For smaller vessels or for winches mounted high on crane booms, verify with the naval architect that the additional 100 kg does not reduce the vessel stability margin below the minimum required by the flag state. On mining headframes, the 100 kg is structurally insignificant compared to the total headframe, drum, and rope weights.

Can the winch drive planetary gearbox brake be tested without lifting a load?

Yes. The brake holding torque can be verified by applying a known hydraulic pressure to the motor ports while the brake is engaged and measuring whether the drum moves. If the motor port pressure (converted to drum torque through the motor displacement and gear ratio) does not cause the drum to rotate, the brake is holding above that torque value. Increase the pressure incrementally until the drum just begins to creep — the corresponding torque is the actual brake holding capacity. This test should be performed at every annual inspection and compared against the factory acceptance value to verify that brake disc wear has not reduced the holding capacity below the minimum requirement.

Production skip hoist at a platinum mine, 780-metre shaft, 20-tonne ore skips, 415W3 at ratio 220. The DMR inspector accepted the 415W3 internal brake as the tertiary emergency hold in our three-level braking hierarchy — motor brake, counterbalance valve, gearbox brake. The 414W3 was evaluated first but the DMR specifically required "a mechanical brake within the drum assembly" — and the 414W3 does not provide it. The 415W3 closed the compliance gap. After 8 months of production winding at 380 cycles per day, the brake holding test shows less than 1% degradation from the factory acceptance value. Oil analysis trending clean. The M6 certification was accepted directly by the DMR without supplementary testing — a first for a replacement winder drive at this mine.

80 t main crane hoist on a semi-submersible heavy-lift vessel. The 415W3 at ratio 160 with the internal brake was specified after our BV surveyor required an independent in-drum hold for lifts exceeding 50 tonnes over water. The 414W3 would have required an external drum calliper brake adding 120 kg, a separate hydraulic circuit, and a separate inspection schedule. The 415W3 internal brake eliminated all three — net weight saving of 20 kg (100 kg brake inside minus 120 kg calliper system), simpler hydraulics, and one fewer inspection item. The crane completed a 78-tonne topside module lift last month with the internal brake engaged during the 35-minute final positioning hold. Zero drift confirmed by surveyor observation.

We underwrote a USD 45 million bridge section lift using a floating crane fitted with the 415W3. The belt-and-braces braking configuration — motor brake, counterbalance valves, PLUS the 415W3 internal brake — satisfied our risk assessment for a Category A high-value lift. The internal brake documentation (brake torque certificate, disc material specification, spring force test data) was included in the pre-lift safety dossier and reviewed by our marine surveyor before coverage was confirmed. The 4-star is a documentation suggestion: for high-value lift insurance, the brake test certificate should include a statement of the minimum brake holding torque at end-of-disc-life — not just the new-condition value. Underwriters need to know the worst-case holding capacity, not the best-case, when assessing the risk of a dropped load during the policy period.