Overview of ZOKECRANE Overhead Crane Duty Motors
Manufactured by Henan Zoke Crane Co., Ltd., ZOKECRANE crane motors are built in strict compliance with IEC, DIN, and ISO electrical engineering standards. Designed for variable frequency drive (VFD) compatibility and harsh duty cycles, our product range includes wound-rotor slip ring motors (YZR/YZ series), squirrel-cage induction motors, electromagnetic brake motors, and specialized three-in-one geared motors. With high overload capacity and mechanical strength, ZOKECRANE electric motors power cranes with lifting capacities ranging from 1 ton to over 300 tons.
Key Technical Specifications & Parameters
| Technical Parameter | Crane Duty Motor Specification |
|---|---|
| Motor Type | Three-Phase Crane Duty Induction Motor (Wound Rotor YZR / Squirrel Cage YZ / Brake Motor) |
| Rated Power Output | 0.8 kW to 315+ kW (Custom heavy-power ratings available) |
| Duty Rating Cycle | S3, S4, S5 Intermittent Periodic Duty (Cyclic Duration Factor CDF 25%, 40%, 60%, 100%) |
| Insulation Class | Class F / Class H (Vacuum Pressure Impregnated VPI windings for thermal endurance) |
| Protection Enclosure Class | IP54 / IP55 Weatherproof & Dustproof (IP66 available for outdoor marine environments) |
| Operating Voltage & Frequency | AC 220V, 380V, 400V, 415V, 440V, 660V (50Hz / 60Hz, 3-Phase) |
| Inverter Compatibility | VFD-ready with insulated bearings and reinforced inter-turn insulation |
| Brake Integration Options | Built-in DC electromagnetic disc brake / Hydraulic thruster brake configuration |
| Certifications & Standards | ISO 9001 Quality System, CE Certified, SGS Verified, IEC 60034 Compliant |
Core Product Advantages & Engineering Features
- High Starting Torque & Overload Capacity: Specially designed magnetic circuits deliver up to 2.8 to 3.0 times maximum torque ratio, effortlessly handling frequent heavy starting under full load.
- VFD Variable Speed Optimization: Reinforced turn-to-turn winding insulation prevents voltage spike degradation during high-frequency inverter switching, enabling smooth stepless speed regulation.
- Class H Thermal Endurance: High-grade copper wind wire with vacuum pressure impregnation (VPI) ensures reliable performance in high-temperature steel mills and severe ambient conditions.
- Heavy-Duty Cast Iron Frame: High-rigidity cast iron motor frames absorb mechanical vibration, protect internal rotors, and ensure long bearing life during frequent reversals.
Industrial Applications of Overhead Crane Motors
ZOKECRANE heavy-duty crane motors provide core drive power across diverse crane mechanisms and heavy industrial production sectors globally:
1. Overhead & Double Girder Hoisting Mechanisms
Drives main winches, trolley hoists, and heavy open winch mechanisms on overhead traveling cranes in manufacturing plants.
2. Crane Bridge & Trolley Travel Drives
Powers long-travel end carriages and trolley cross-travel mechanisms via three-in-one geared motors or soft-start motor reducers.
3. Metallurgical & Foundry Steel Mill Cranes
High-temperature YZR/YZ series motors engineered for ladle cranes, scrap handling cranes, and charging trolleys in melt shops.
4. Port Marine & Outdoor Gantry Cranes
IP55/IP66 weather-sealed motors deployed on rail-mounted gantry cranes (RMG), rubber-tired gantry cranes (RTG), and portal slewing cranes.
Frequently Asked Questions (Product FAQs)
What is the difference between a standard industrial motor and a Crane Duty Motor?
Standard industrial motors run continuously at a constant speed (S1 duty). Crane Duty Motors are engineered for intermittent periodic duty (S3/S4) with high cyclic duration factors, capable of handling frequent starting, electrical braking, heavy thermal loads, and dynamic shocks without overheating.
Which motor type is better for cranes: Wound Rotor (YZR) or Squirrel Cage (YZ)?
Wound Rotor Motors (YZR) feature slip rings that connect external resistance for ultra-high starting torque with low starting current, making them ideal for heavy-duty starting or legacy resistance speed control. Squirrel Cage Motors (YZ) are simpler, maintenance-free, and ideal when paired with modern Variable Frequency Drives (VFDs).
Why do crane motors require Variable Frequency Drives (VFD)?
Integrating VFD control lowers starting inrush current, reduces mechanical shock to gearboxes and couplings, allows stepless speed adjustment, prevents load sway, and dramatically extends motor insulation lifespan.
Can ZOKECRANE crane motors operate in high-temperature metallurgical environments?
Yes. We supply Class H insulated motors with thermal protection sensors (PT100/PTC thermistors) and forced cooling fans designed specifically for high ambient temperatures in steel foundry bays.
Export & Logistics FAQs for International Buyers
Which international markets does ZOKECRANE export crane motors to?
ZOKECRANE electric motors and crane drive components are exported worldwide, supplying crane builders, electrical integrators, and industrial users in Russia, Uzbekistan, the Philippines, Bangladesh, Australia, Qatar, Tanzania, Singapore, Saudi Arabia, Brazil, Nigeria, and many other global markets.
How are electric crane motors packaged for international ocean freight shipment?
All motor shaft extensions and keyways receive protective anti-rust grease and sleeve guards. Complete motor assemblies are vacuum-sealed in moisture-proof plastic film and packed in heavy-duty export-standard fumigated wooden cases with internal structural cushioning.
What quality test reports and certifications accompany ZOKECRANE crane motors?
Every motor shipment is supplied with a complete quality assurance dossier, including ISO 9001 compliance, European CE certificates, IEC factory routine test reports (no-load test, insulation resistance, winding resistance, withstand voltage), and SGS third-party inspection certificates upon request.
What commercial shipping terms and manufacturing lead times do you offer?
We support standard international commercial terms including FOB, CIF, CFR, DDU, and DDP. Standard voltage/frequency crane motors (0.8 kW to 90 kW) are kept in stock with fast lead times of 5 to 10 business days; custom high-voltage or special flange-mounted motors take 15 to 25 business days.
Does ZOKECRANE supply replacement motors matching old OEM crane mounting dimensions?
Yes. Our engineering department can match motor frame sizes (IEC/DIN standard frames), shaft extensions, flange dimensions, and terminal box positions directly according to your CAD drawings, nameplate specs, or old replacement requirements.