GB 18613-2020 Motor Energy Efficiency Limits and Grades Explained
GB 18613-2020, "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Electric Motors," is a mandatory national standard governing motor energy efficiency. It specifies the energy efficiency limits, efficiency grades, and test methods for three-phase asynchronous motors. This standard serves as the core basis for motor efficiency assessment and energy-saving product certification. Kelude Heavy Industry strictly complies with this standard in the manufacturing and selection of overhead crane motors, ensuring every matched motor meets IE3 energy efficiency grade requirements and above.
GB 18613-2020Motor Energy Efficiency Limits and GradesIE393.5% EfficiencyIE495.0% EfficiencyIE596.0% EfficiencyIE2Phased OutEfficiency grades from low to high 0.75~375kW Three-Phase Asynchronous MotorsIE3 Mandatory Baseline from 2022Efficiency
Application Scope and Regulatory Role
GB 18613-2020, "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Electric Motors," applies to three-phase asynchronous motors with a rated voltage of 1000V and below, a rated frequency of 50Hz, and a rated power range of 0.75kW to 375kW, covering both general-purpose and explosion-proof motors. The standard does not apply to traction motors, VFD-specific motors (evaluated under GB/T 22670), or other special-purpose motors. This standard supersedes the GB 18613-2012 edition, raising overall energy efficiency indicators by approximately 1 to 2 percentage points and introducing the IE5 efficiency grade classification. In terms of technical indicators, the standard is equivalent to IEC 60034 "Rotating Electrical Machines"-30-1, "Efficiency Classes of Rotating Electrical Machines."
In the crane industry, three-phase asynchronous motors are widely used in hoisting mechanisms and travel mechanisms of overhead cranes. The implementation of GB 18613-2020 directly impacts the energy efficiency assessment of overhead cranes and their market access requirements. Kelude Heavy Industry strictly follows this standard in motor selection for its overhead crane products, offering IE3 Premium Efficiency Motors as standard, with customizable IE4 and IE5 ultra-premium efficiency motor options. This standard works in conjunction with the motor selection requirements outlined in GB/T 3811-2008 "Crane Design Standard", collectively forming the technical standard system for overhead crane motor selection. The standard also references GB/T 1032, "Test Procedures for Three-Phase Asynchronous Motors," as the foundational test procedure for efficiency measurement.
Efficiency Grade Classification and Test Method Comparison
The standard classifies motor energy efficiency grades from highest to lowest as IE5, IE4, IE3, and IE2. Taking a 30kW four-pole motor as an example, the efficiency requirements for each grade are: IE5 efficiency ≥96.0%, IE4 efficiency ≥95.0%, IE3 efficiency ≥93.5%, and IE2 efficiency ≥91.5%. The higher the energy efficiency grade, the lower the energy loss during the conversion of electrical energy into mechanical energy, resulting in lower motor temperature rise and extended operational lifespan. Since 2022, motors with IE2 efficiency grades and below are prohibited from being sold in the Chinese market, and new construction or renovation projects are strictly forbidden from using IE2 motors and below.
Kelude Heavy Industry: Engineered Lifting Solutions for Demanding Industrial Applications
Kelude Heavy Industry specializes in the design and manufacture of heavy-duty overhead cranes and hoisting equipment. Our product range is engineered to meet the rigorous demands of modern industrial facilities, delivering reliable performance, enhanced safety, and long-term operational efficiency.
Comprehensive Crane Solutions for Every Sector
We provide a full spectrum of overhead crane systems, from single-girder and double-girder bridge cranes to specialized explosion-proof and low-headroom configurations. Each system is tailored to the specific requirements of your application, ensuring optimal material handling across industries such as steel processing, power generation, general manufacturing, and logistics.
| Crane Type | Typical Applications |
| Single-Girder Bridge Crane | Light-to-medium duty workshops, maintenance bays, and assembly lines |
| Double-Girder Bridge Crane | Heavy-duty production, steel yards, and high-capacity lifting (up to 100+ tons) |
| Explosion-Proof Crane | Hazardous environments (chemical plants, oil & gas, paint shops) |
| Low-Headroom Crane | Facilities with limited building height or where maximum hook lift is critical |
Precision Engineering with Advanced Safety Features
Our cranes are designed with a focus on safety and precision. Standard features include anti-sway control for accurate load positioning, self-locking gearboxes to prevent unintended movement, and multi-pole motor protection. We integrate variable-frequency drives (VFDs) for smooth acceleration and deceleration, reducing mechanical stress on both the crane and the load. All equipment complies with international design standards, including ISO 4301 for crane classification and IEC 60204-32 for electrical equipment, ensuring reliable operation under continuous heavy use.
Customized Lifting Solutions & Project Support
Beyond standard models, Kelude offers fully customized crane solutions. Our engineering team works closely with you to develop a crane that meets your exact span, lifting height, and capacity requirements. We provide complete project support, from initial site assessment and structural design to installation, commissioning, and after-sales service. Whether you need a single crane for a new facility or a fleet of cranes for a large-scale expansion, our goal is to deliver a solution that maximizes your uptime and productivity.
Global Standards, Local Service
With a strong export track record, Kelude supplies cranes to markets across North America and Europe. We understand the importance of compliance with local regulations and safety standards. Our equipment is engineered to meet or exceed the requirements of ISO 12480 for crane safety, and we offer documentation and support to facilitate certification in your region. Our local service partners ensure prompt response times for maintenance, spare parts, and technical support, minimizing downtime and extending the lifespan of your investment.
Frequently Asked Questions
Q: What is the typical lead time for a custom overhead crane?
A: Lead times vary depending on the complexity and specifications of the crane. A standard single-girder crane can typically be delivered within 8-12 weeks, while a large double-girder or explosion-proof system may take 16-20 weeks. We provide a detailed project schedule upon quotation.
Q: Do you provide installation and commissioning services?
A: Yes, we offer full installation and commissioning services by our own trained technicians or through our certified local partners. We also provide operator training and comprehensive documentation to ensure safe and efficient operation from day one.
Q: Can you supply cranes that meet specific international standards?
A: Absolutely. Our cranes are designed to comply with ISO 4301, ISO 12480, and IEC 60204-32, among others. We can also adapt designs to meet specific local codes and requirements, and we provide all necessary compliance documentation.
| Energy Efficiency Class | IE3(High Efficiency) | IE4(Ultra-High Efficiency) | IE5(Maximum Efficiency) |
|---|---|---|---|
| Efficiency(30kW/4P) | 93.5% | 95.0% | 96.0% |
| Annual Power Consumption | 78,500kWh | 77,200kWh | 76,000kWh |
| Relative Cost | Base Price | +15~25% | +40~60% |
| payback period | – | 1.5~2Year | 2.5~3.5Year |
| Application Scenarios | General Purposeoverhead crane Standard Configuration | Energy Saving Upgrade Preferred Choice | Export/Green Factory Solution |
A: The standard carries mandatory legal force regarding energy efficiency limits. Motors manufactured or sold by enterprises must meet Energy Efficiency Class IE3 and above; products that fail to comply are prohibited from market sale. The standard also specifies energy labeling requirements, mandating that efficiency values, energy efficiency classes, and standard numbers be clearly marked on motor nameplates. For bulk purchasers of motors, compliance can be verified by reviewing Type Test Reports and conducting on-site sampling inspections. Kelude has implemented an energy efficiency re-verification process at the motor incoming inspection stage to ensure every motor used in its products meets the standard's requirements.
For testing methods, the standard specifies three efficiency measurement methods: Method A (input-output method, which directly measures input electrical power and output mechanical power, offering the highest accuracy and suitable for small-to-medium power motors), Method B (loss analysis method, which calculates efficiency indirectly by measuring copper loss, iron loss, mechanical loss, and stray load loss, suitable for large power motors), and Method E (indirect method, intended for routine testing and energy efficiency spot checks). Method A serves as the arbitration method; Type Tests and energy efficiency certification use either Method A or Method B. Test results must undergo uncertainty evaluation per the standard, with measurement uncertainty required to be better than ±0.5%.
Three-Phase Asynchronous Motors
IE3 is the mandatory minimum
Method A is the arbitration method
Internationally recognized
Non-compliance subject to penalties
Compressors / machine tools
Energy Efficiency Certification Process and Global Equivalency
Motor energy efficiency certification requires filing with the China Energy Label Management Center. After a CNAS-accredited laboratory issues the Type Test Report, the energy label can be affixed. The certification process comprises six steps: sample submission, Type Test Report issuance, filing application, label affixing, and market supervision. Once certified, products are subject to unannounced spot checks by market supervision authorities; failure can result in fines and recalls. The energy label's validity generally aligns with the product's lifecycle, though a new Type Test is required when standards are updated.
Regarding international equivalency of energy efficiency classes, GB 18613-2020 "Energy Efficiency Limit Values and Energy Efficiency Grades for Motors" classes IE3 through IE5 correspond to the equivalent classes in IEC 60034 "Rotating Electrical Machines"-30-1. The EU Energy Efficiency Directive EU 2019/1781 requires motors from 0.75 to 1000 kW to meet IE3 since July 2021. In the US, DOE energy efficiency regulations require 1–500 HP motors to meet the NEMA Premium efficiency level (approximately equivalent to IE3). Kelude's overhead crane motors carry both the China Energy Label and CE Certification, ensuring compliance across different target markets. For motors operating under Variable Frequency Drive (VFD) conditions, energy efficiency evaluation must follow GB/T 22670-2018 "Test Methods for Three-Phase Cage Induction Motors Fed by Frequency Inverters."
Impact on Overhead Crane Motor Selection
When selecting overhead crane motors, the energy efficiency requirements of GB 18613-2020 directly influence the selection strategy. For hoisting mechanisms using Variable Frequency Speed Control, the standard applies to efficiency evaluation under line-frequency power; efficiency under VFD operation should be assessed per GB/T 22670. Selection should consider the crane's Work Duty Classification (A1~A8) and duty cycle to determine the motor's rated power and overload capacity, while also prioritizing energy efficiency class. An IE4 motor can save 15–20% on electricity costs over its lifecycle compared to an IE3 motor, with a payback period of approximately 1.5–2 years.
All Kelude overhead crane products are equipped with IE3 or higher efficiency motors, and IE4 and IE5 Permanent Magnet Synchronous Motor options are available on request. Permanent magnet motors use a neodymium-iron-boron permanent magnet rotor instead of a wound rotor, offering advantages such as high efficiency (IE5 class ≥96%), high power density, and a wide high-efficiency speed control range. These features make them well-suited for overhead crane duty cycles with frequent start-stop operation and partial loads. When selecting a permanent magnet motor, note that a dedicated driver is mandatory, and demagnetization protection must be configured to ensure long-term operational reliability.
FAQ
Q: How do the energy efficiency classes in GB 18613-2020 correspond to those in IEC 60034-30?
A: The IE3, IE4, and IE5 Energy Efficiency Classes in GB 18613-2020 correspond directly to the IE3, IE4, and IE5 classes defined in IEC 60034-30-1:2014, with essentially identical efficiency thresholds. GB 18613-2020 adopts the IEC 60034-30-1 classification system with minor adjustments for China's grid frequency and voltage conditions. Motors certified under the Chinese national standard therefore also meet international energy efficiency requirements in principle.
Q: What should be considered when applying IE5 permanent magnet motors to overhead cranes?
A: IE5 permanent magnet motors require a dedicated permanent magnet driver — a standard VFD may not be able to operate them. There is also a risk of demagnetization, so high-temperature-resistant NdFeB permanent magnet materials and a demagnetization protection circuit are essential. Since the rotor has no squirrel-cage winding, direct-on-line starting at line frequency is not possible; the motor must be soft-started through a VFD. That said, permanent magnet motors deliver IE5-level efficiency, a compact footprint, and high power density, making them particularly well suited for crane hoisting mechanisms — especially in applications with frequent start/stop cycles, where the energy savings are most pronounced.
Q: How can compliance of an overhead crane motor with GB 18613-2020 be verified?
A: The simplest way is to check the energy efficiency label on the motor nameplate — a compliant motor should clearly state its efficiency class, measured efficiency, and the applicable standard number. You can also request a valid Type Test Report issued by a CNAS-accredited laboratory from the supplier. At Kelude, every incoming motor batch undergoes an energy efficiency re-verification process, with samples tested using Method A as specified in the standard, ensuring the efficiency indicators are accurate and reliable.
Q: How do the energy efficiency requirements of GB 18613-2020 apply to VFD-fed motors?
A: The efficiency classes in GB 18613-2020 are determined under rated conditions at 50 Hz line frequency. For overhead crane motors powered by a VFD, efficiency evaluation should follow GB/T 22670-2018 "Test Methods for Three-Phase Squirrel-Cage Induction Motors Fed by Variable Frequency Converters," which specifies the measurement and calculation procedures for motor efficiency under variable-frequency operation. When purchasing VFD-fed motors, we recommend requesting variable-frequency efficiency test data per GB/T 22670 from the supplier.
GB 18613-2020 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Motors" is the fundamental mandatory standard governing overhead crane motor selection and energy efficiency management. Kelude strictly adheres to this standard, combining the technical requirements of GB/T 3811 Crane Design Standard — Core Provisions and GB/T 22670 "Test Methods for VFD-Fed Motors" to deliver optimized motor selection solutions and lifecycle energy efficiency management services for crane users. Choosing Kelude means choosing efficient, energy-saving technology you can rely on.
