ZL01 Wheel Drive Planetary Gearbox

The EP-ZL01 belongs to a different engineering lineage than the 6xx-series wheel drive planetary gearboxes. Where the 601 through 615 are built for heavy mobile equipment with low-speed hydraulic motors, the ZL01 is designed for the machines that are replacing them: battery-electric AGVs, autonomous mobile robots, compact electric utility platforms, and lightweight industrial vehicles driven by high-speed BLDC or PMSM motors spinning at 3,000-5,000 rpm.

The 5,000 rpm maximum input speed — 67% higher than the 3,000 rpm ceiling of the 6xx series — allows direct coupling to electric motor shafts without an intermediate speed-reduction stage. Combined with 60 discrete gear ratios across 1-stage through 4-stage configurations covering a 3.48:1 to 2,702:1 range, the ZL01 can be precisely matched to virtually any electric motor and wheel combination from a 200 kg warehouse AGV to a 3-tonne outdoor utility robot.

1-Stage (3.48-7.20)

High-speed, low-reduction applications. Electric scooter wheel motors, light AGV drive wheels with large-diameter hub motors. Maximum efficiency (fewest mesh losses). The motor does most of the work; the gearbox provides fine-tuning.

2-Stage (12.11-51.98)

The core range for most AGV and compact EV applications. A 3,000 rpm BLDC motor at ratio 25 with a 200 mm wheel produces approximately 4.5 km/h — typical warehouse AGV speed. Ten ratio options provide precise speed matching without motor controller compromises.

3-Stage (42.14-374.78)

Heavy-load AGVs, outdoor robotic platforms, and small construction robots that need high wheel torque from compact motors. Twenty ratios in this range give the designer extreme flexibility to match any motor-wheel-speed combination without oversizing the motor.

4-Stage (243.54-2,702.13)

Ultra-high-reduction for precision positioning, winch drives, very low-speed heavy crawlers, and specialised rotation mechanisms. At ratio 2,702, a 5,000 rpm motor produces less than 2 rpm at the output — one revolution every 33 seconds. These ratios serve applications where speed is measured in millimetres per second.

BLDC Hub Motors (1,500-5,000 rpm)

Brushless DC hub motors in the 200-1,000 W range are the standard drive for warehouse AGVs and small outdoor robots. These motors produce maximum efficiency at 3,000-4,500 rpm — speeds that exceed the 6xx series input limit but fall comfortably within the ZL01 range. Direct-coupling a BLDC motor to the ZL01 input spline eliminates the belt or chain reduction stage that would otherwise be needed, saving weight, space, and a maintenance item.

PMSM Servo Motors (2,000-5,000 rpm)

Permanent magnet synchronous motors used in precision AGV and AMR platforms for their excellent speed control and positioning accuracy. The ZL01 2-stage and 3-stage ratios match the PMSM speed range directly, and the DIN 5-6 gear accuracy preserves the motor positioning resolution through the gear reduction. At ratio 25 with a servo motor capable of 0.01-degree resolution, the ZL01 delivers 0.00040-degree resolution at the output — sub-micron positioning at the wheel contact patch.

High-Speed Orbital Hydraulic Motors

Compact orbital motors (Eaton Char-Lynn, Danfoss OMS/OMR) spinning at 3,000-5,000 rpm for lightweight hydraulic-drive vehicles. The ZL01 3-stage at ratios 42-180 converts these high-speed, low-torque motors into effective wheel drives for small agricultural robots, autonomous mowing platforms, and compact construction equipment where a full-size axial piston motor would be oversized and overweight.

Regenerative Braking Compatibility

The ZL01 planetary gear train is mechanically symmetrical — it transmits torque identically in both directions. This means electric motors using regenerative braking can feed deceleration energy back through the gearbox to the battery without any mechanical limitation from the gears. The absence of an internal brake in the ZL01 is an advantage in regen-equipped platforms, since a mechanical brake would interfere with the motor controller regen algorithm.

Warehouse and Factory AGVs

Automated guided vehicles carrying 500-3,000 kg payloads at 2-6 km/h through manufacturing plants, distribution centres, and cold storage facilities. The ZL01 2-stage at ratios 18-30 paired with 200-500 W BLDC motors provides the compact, sealed, maintenance-free wheel drive that 24/7 automated operations demand. The IP67+ sealing handles the washdown environments common in food and pharmaceutical logistics.

Autonomous Mobile Robots (AMRs)

Freeform-navigation robots for warehouse picking, hospital logistics, and last-mile delivery. AMRs require precise speed control for obstacle avoidance and docking accuracy. The ZL01 3-stage at ratios 60-120 paired with PMSM servo motors delivers the sub-millimetre positioning resolution these platforms need at the wheel contact patch, while the high-precision planetary gearbox handles the steering actuator on the same robot.

Compact Electric Utility Vehicles

Battery-electric site vehicles, golf carts, airport baggage tractors, and campus transport platforms in the 500-3,000 kg GVW range. The ZL01 1-stage at ratios 3.48-5.77 paired with high-torque BLDC motors provides the simplest possible drivetrain: motor, gearbox, wheel — no chains, no belts, no differential. The single-stage 96%+ efficiency directly extends battery range compared to multi-stage alternatives or worm gear reducers at 40-65% efficiency.

How does the ZL01 differ from the 601L1A — both are in the 700 Nm range?

The 601L1A delivers 1,750 Nm at 1,000 rpm maximum input with an integrated parking brake and manual declutch — it is a heavy-vehicle wheel drive scaled to the lightest end of the 6xx range. The ZL01 delivers 700 Nm continuous at 5,000 rpm maximum input with no internal brake — it is a compact industrial planetary reducer optimised for high-speed electric motors. The input speed difference (5x) and the internal architecture (helical 3-planet vs straight-cut) make these fundamentally different products despite the overlapping torque range. Choose the ZL01 for electric-motor-driven platforms; choose the 601L1A for hydraulic-motor-driven vehicles.

Does the ZL01 include a parking brake?

No. The ZL01 is designed for platforms where braking is handled by the electric motor (regenerative braking, motor short-circuit braking) or by an external electromagnetic brake mounted on the motor shaft. Most AGV and AMR controllers provide electronic braking as a standard function. If a mechanical parking brake is required (for example, on sloped warehouse floors), specify an electric motor with an integrated electromagnetic brake — this acts on the motor shaft and is multiplied through the ZL01 gear ratio to the wheel.

What is the backlash of the ZL01 at DIN 5-6 accuracy?

At DIN 5-6 gear accuracy, the ZL01 typically exhibits 8-15 arcminutes of output backlash for 2-stage configurations, increasing to 12-25 arcminutes for 3-stage and 18-35 arcminutes for 4-stage. For AGV wheel drive applications, this backlash is negligible — it represents less than 0.1 mm at the tyre contact patch. For precision positioning applications where backlash must be minimised, the 2-stage configuration provides the tightest output and the DIN 5 end of the tolerance band can be specified at order.

Can a wheel drive planetary gearbox operate in a food-grade washdown environment?

The ZL01 IP67+ rating means the housing is sealed against immersion in water up to 1 metre for 30 minutes. This exceeds the splash and jet-wash requirements of food processing, pharmaceutical, and cold storage environments. The FKM (Viton) seals resist the cleaning chemicals (sodium hypochlorite, quaternary ammonium compounds) commonly used in food facility sanitation. For H1 food-grade lubrication compliance, the standard API GL-5 oil can be replaced with an NSF H1-registered synthetic gear oil — contact Korea Ever-Power for the approved H1 oil list.

What is the noise level of the ZL01 compared to the 6xx series?

The ZL01 uses helical-cut planet gears, which produce significantly lower mesh noise than the straight-cut gears used in some 6xx-series models. At 3,000 rpm input and no-load conditions, the ZL01 2-stage typically measures 58-65 dB(A) at 1 metre — quiet enough for indoor warehouse and hospital logistics environments. Under full load, noise increases by 5-8 dB(A). For noise-sensitive applications, the 2-stage configuration is quieter than the 3-stage or 4-stage because fewer gear meshes contribute to the total sound level.

How does the ZL01 handle the continuous duty cycle of a 24/7 AGV operation?

The 700 Nm continuous rating is defined at N2 x h = 100,000 hours — meaning the gears and bearings are rated for 100,000 hours at continuous full load. In a 24/7 AGV operating at 80% average load factor, the expected gear and bearing life exceeds 125,000 hours (approximately 14 years). The practical maintenance items are oil changes (every 5,000 hours for indoor clean environments) and seal inspection (every 10,000 hours). The ZL01 is designed to outlast the AGV platform it is installed on — in most cases, the AGV electronics, battery, and navigation system will reach obsolescence before the wheel drive needs its first overhaul.

Fleet of 24 warehouse AGVs, ZL01**2 ratio 24.62, paired with 400 W BLDC motors. These AGVs run 22 hours per day, 6 days per week, carrying 1,200 kg automotive components. After 14 months of operation (approximately 8,000 hours per unit), we have had zero wheel drive failures. Noise level is acceptable for indoor operation — the BLDC motor is louder than the gearbox. The IP67 sealing has survived our weekly floor washdown with no ingress. We are specifying the same configuration for a new 36-AGV installation at a different plant.

Hospital logistics AMR, ZL01**3 ratio 85.67, PMSM servo motor with electromagnetic brake. Our robot delivers medications, lab samples, and meal trays across a 12-floor hospital. The ZL01 noise level at 62 dB was the deciding factor over two competing gearboxes that measured 71 and 74 dB — in a hospital environment, the 9-12 dB difference is the difference between acceptable and complaints from night-shift nursing staff. Positioning accuracy at docking stations is within 3 mm consistently. We have 8 robots deployed; ordering 12 more.

Battery-electric campus shuttle vehicle, ZL01**1 ratio 4.26, direct-coupled to a 1.5 kW BLDC motor. Range improvement over the previous worm-gear setup was dramatic — the vehicle now covers 45 km per charge versus 28 km before, which is entirely attributable to the efficiency improvement from 58% (worm) to 96% (ZL01 single-stage). The 4-star rating is because the motor-to-gearbox spline coupling required a custom adapter sleeve that added 3 weeks to our prototype build. If Ever-Power could offer a range of standard adapter sleeves for common BLDC motor shaft sizes (8 mm, 10 mm, 12 mm, 14 mm keyed), this product would be immediately accessible to the entire EV conversion market.