YE3VF Series IE3 Premium Efficiency Variable Frequency Asynchronous Motors

Developed on the high efficiency YE3 platform, the YE3VF Series Vaiable Frequency Three Phase Asynchronous Motor incorporates specialized design optimizations for variable frequency operation. Strictly compliant with the GB/T 22670 standard (Test Methods for Inverter-fed Three-Phase Cage Induction Motors) and meeting the GB18613-2020 Grade 3 efficiency (IE3) requirements, it covers a power range of 1.1-315 kW and is compatible with standard variable frequency drives (VFDs). This series maintains stable operation across a frequency range of 5-100Hz, making it an ideal choice for both VFD retrofits and new industrial equipment projects

The YE3VF Series is a three-phase asynchronous motor designed specifically for variable frequency drive (VFD) applications, achieving IE3 premium efficiency. It delivers solid energy performance while offering excellent adaptability to variable speed control. This makes it well-suited for equipment requiring speed regulation, such as fans, pumps, and compressors, providing users with a cost-effective and reliable variable frequency drive solution.

Key Features

Developed on the high-efficiency YE3 platform, the YE3VF Series inverter-duty motor is specifically optimized for variable frequency operation. It incorporates an independent cooling system to ensure balanced heat dissipation across the entire 5-100Hz frequency range for stable performance. The optimized electromagnetic design, combined with a reinforced insulation system, significantly enhances durability under variable frequency conditions, making it particularly well-suited for industrial applications requiring frequent speed adjustments.

Optimized for VFD Operation: The electromagnetic design is tailored for inverter power supply, reducing harmonic losses, improving operational efficiency under VFD control, and delivering notable energy savings.

Stable Full-Range Operation: Equipped with an independent cooling fan, it maintains effective heat dissipation even at low speeds, preventing excessive temperature rise and ensuring reliable performance.

Cost-Effective: Provides a competitive cost advantage while maintaining performance, resulting in a short payback period and high overall value.

Easy Integration: Offers excellent compatibility with mainstream VFDs, simplifies commissioning, and reduces both system upgrade costs and on-site debugging time.

Strong Application Adaptability: Designed for variable load conditions, it is ideally suited for industrial applications such as fans, pumps, and compressors that require frequent speed regulation.

Technical Specifications

Power Range: The YE3VF Series inverter-duty motors cover a power range of 1.1-315 kW across 22 frame sizes, offering flexible selection for diverse load requirements. They are available in 2, 4, 6, and 8-pole configurations to meet various speed and load characteristic demands, ensuring broad application compatibility.

Rated Voltage: Designed for direct connection to 380V/400V/415V, 50Hz three-phase AC power supplies in compliance with domestic grid standards. No additional configuration is needed. Their strong voltage adaptability ensures stable operation under varying grid conditions.

Efficiency Class: Meeting the GB18613-2020 Grade 3 (IE3) efficiency standard, these motors achieve a 2-4 percentage point efficiency gain over standard models, delivering significant energy savings. The use of high-frequency, low-loss silicon steel and optimized winding design effectively suppresses harmonic losses, maintaining excellent efficiency across a wide frequency range.

Power Factor: The optimized electromagnetic design results in a high power factor of 0.86-0.89 at 50Hz. This reduces reactive power losses, improves grid power quality, lowers line losses, and enhances overall system operating efficiency.

Protection Level: Rated IP55, the motors are effectively sealed against dust ingress and water jets, extending service life in harsh environments. The Totally Enclosed Fan-Cooled (TEFC) construction provides excellent heat dissipation for reliable, long-term operation.

Frame Construction: The high-strength cast iron frame ensures robust durability and excellent heat dissipation, capable of withstanding significant mechanical stress for long-term, stable operation. Its corrosion-resistant surface finish provides a clean appearance and extended service life. With an IP55 protection rating, it is suitable for demanding operating environments.

Cooling Method: Features a separate forced ventilation (IC416) system with a dedicated cooling fan. This design ensures consistent airflow and superior cooling at any motor speed. The optimized airflow path provides high cooling efficiency, maintaining stable temperature rise across the entire frequency range and preventing performance loss due to overheating.

Insulation Class: The Class F insulation system is rated for a Class B temperature rise, providing a substantial thermal margin for extended insulation life and reliable operation at elevated temperatures. The stator is processed using Vacuum Pressure Impregnation (VPI), ensuring stable insulation performance and strong resistance to voltage surges for safe, long-term operation under VFD supply.

Mounting Options: Available in various configurations including B3, B5, and B35 arrangements to accommodate horizontal, vertical, and other mounting requirements. The frame feet feature a practical design with standard mounting holes for quick and secure connection to equipment, minimizing installation time.

Bearing System: Equipped with high-quality deep groove ball bearings. Insulation protection is provided as standard to effectively prevent bearing current damage, significantly extending bearing service life. The system incorporates a long-life lubrication design, extending maintenance intervals and reducing associated costs.

Starting Torque: These motors offer a high starting torque ratio of 150%-180% of rated torque, delivering reliable starting performance suitable for heavy-duty and frequent start-stop operations. They ensure smooth starting with minimal impact on the power grid and connected equipment.

Breakdown Torque: With a breakdown torque ratio of 200%-250% of rated torque, the motors provide robust overload capacity. They can withstand short-term overload conditions and maintain stable operation under demanding scenarios, ensuring high reliability.

Noise Level: Utilizing an optimized airflow design and a low-noise fan, the motors operate quietly in compliance with GB10069 standards. The typical sound pressure level at a 1-meter distance is ≤78 dB(A), making them suitable for noise-sensitive environments like offices and hospitals.

Vibration Grade: The rotor is dynamically balanced in accordance with ISO 10816 standards, ensuring smooth operation and reduced stress on connected machinery. With a typical vibration velocity of ≤2.8 mm/s, the motors support long-term stable system performance.

Duty Cycle: Rated for S1 continuous duty, the motors are engineered for reliable, long-term operation with stable temperature rise. The optimized thermal design reduces temperature rise by approximately 10K compared to conventional motors, providing effective heat dissipation for various industrial applications.

Operating Temperature: Designed for reliable operation in ambient temperatures from -15°C to +40°C. With a substantial temperature rise margin, it offers strong adaptability for stable performance across various climates. The optimized cooling design ensures consistent operation even in high-temperature environments.

Altitude: Suitable for direct use at altitudes up to 1,000 meters. Applications above this altitude require derating per relevant standards. Customized solutions are available for special environments, including anti-corrosion, moisture-proof, and explosion-proof treatments.

Safety Certifications: The product is certified with CCC (China Compulsory Certification) and CE marking, confirming compliance with national electrical safety standards for reliable and safe use. Its energy-saving performance is also validated by the official China Energy Label certification.

Warranty: The complete motor is covered by an 18-month warranty, with a 12-month warranty for bearings. Comprehensive technical support and after-sales service are provided to protect customer interests, including free repair services during the warranty period.

Compliance Standards: Conforms to Chinese National Standards including GB/T 22670, GB18613-2020, and GB/T 755, with performance metrics meeting advanced international levels. The product also complies with the IEC 60034 series of international standards, fulfilling requirements for global exports.

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Motor Selection Guide and FAQ

Motor Selection Guide
1. Define Basic Parameters
Power & Speed:
Determine the required rated power based on load characteristics and define the motor pole count and speed range according to your equipment’s operational speed.
Voltage & Frequency:
Confirm your power supply standard (e.g., 380V/50Hz, 480V/60Hz). Custom designs are available for special voltage requirements.
Mounting Type:
Specify IEC standard mounting (e.g., B3, B5, B14). Custom the flanges & bases are also supported.
2. Consider Operating Environment
Protection Rating (IP):
IP55 for standard environments. IP65 is recommended for damp or dusty conditions. Hazardous areas require Ex D/Ex E certifications.
Insulation Class:
Class F (155°C) for general use. Class H (180°C) insulation is advised for high-temperature environments.
Cooling Method:
Self-ventilated (IC411) for standard applications. Forced air or water cooling is available for enclosed spaces or high-power-density scenarios.
3. Match Load Characteristics
Starting Torque:
Consider starting torque for fan/pump loads. Verify locked-rotor torque for conveying equipment.
Duty Cycle:
Standard motors are suitable for continuous operation (S1). Frequent start-stop cycles (S5) require reinforced bearings and insulation.
Efficiency Requirement:
Select IE3/IE4/IE5 efficiency classes based on annual operating hours. Ultra-premium efficiency (IE5) motors offer the lowest total cost of ownership for long-running applications.
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