YKK Series IE4 Air-Air Cooled (CACA) High-Voltage Asynchronous Motors

YKK Series IE4 Air-Air Cooled (CACA) High-Voltage Asynchronous Motors

The YKK Series high-voltage motors feature an advanced CACA (Closed Air-Circuit Air-Cooled) enclosure design, providing a fully enclosed air-cooling cycle that effectively prevents dust and moisture ingress. This makes them particularly suitable for harsh industrial environments, such as those with high dust or humidity levels. With rated voltages of 6 kV and 10 kV and a power range from 250 kW to 5,000 kW, these motors incorporate modular winding designs and a reinforced insulation system. This ensures high operational efficiency while significantly improving environmental adaptability and service life. The CACA enclosure design also facilitates easier maintenance, making these motors a reliable power source for critical equipment such as large fans, pumps, and compressors

The YKK Series high-voltage asynchronous motors are designed with an optimized CACA (Closed Air-Circuit Air-Cooled) enclosure, combining high efficiency with reliable operation. They are engineered to meet the high-power drive demands of industries such as power generation, metallurgy, and chemical processing, providing an ideal power solution for industrial energy savings and stable operation.

Key Features

The YKK Series high-voltage motors feature an advanced CACA (Closed Air-Circuit Air-Cooled) enclosure design. This fully enclosed air-cooling cycle effectively prevents the ingress of dust and moisture, making them particularly suitable for harsh industrial environments. With rated voltages of 6 kV and 10 kV and a power range of 250–5,000 kW, these motors utilize a modular winding design and a reinforced insulation system. This ensures high operational efficiency while significantly improving environmental adaptability and service life. The CACA enclosure facilitates easier maintenance, establishing these motors as a reliable power source for critical equipment such as large fans, pumps, and compressors.
Efficient Cooling Structure:​ The CACA enclosure design enables efficient heat dissipation through internal air ducts and an external cooler, while effectively blocking contaminants like dust and moisture from entering the motor.
High Energy Efficiency:​ Meets the GB30254 Grade 2 efficiency standard (IE4 equivalent). The optimized electromagnetic design maintains high efficiency across a wide operating range, delivering 5%–10% energy savings compared to traditional high-voltage motors.
Strong Environmental Adaptability:​ Features special sealing and anti-corrosion designs. The welded high-strength steel housing provides a high protection rating, ensuring long-term reliable operation in complex, dusty, and humid industrial environments.
Easy & Reliable Maintenance:​ The modular design simplifies inspection and repair, allowing key components to be serviced or replaced independently. The spacious CACA enclosure interior reduces maintenance costs and improves equipment availability.
Excellent Starting Performance:​ Offers high starting torque, strong overload capacity, and fast dynamic response, making it ideally suited for applications like fans, pumps, and compressors that require frequent speed adjustment and heavy-duty starts.

Technical Specifications

Power Range:​ The YKK Series covers a rated power range from 250 kW to 5000 kW. Its flexible power configurations cater to diverse drive requirements, from mid-sized equipment to large industrial installations, making it suitable for various large-scale machinery in industries such as power generation, metallurgy, mining, cement, and chemical processing.
Rated Voltage:​ Compatible with two industrial voltage levels: 6 kV and 10 kV. This aligns with mainstream high-voltage grid standards domestically and internationally, facilitating equipment matching and system integration while reducing retrofit costs. It is particularly well-suited for high-voltage applications such as large fans, pumps, and compressors.
Efficiency Class:​ Meets the GB30254 Grade 2 energy efficiency standard (IE4 equivalent). Utilizing an optimized electromagnetic design and low-loss materials, it maintains high efficiency across a wide operating range, delivering 5%–10% energy savings compared to traditional high-voltage motors and significantly reducing long-term operating energy consumption.
Power Factor:​ Achieves a power factor of 0.88–0.92. This near-unity power factor greatly reduces reactive power losses, alleviates grid burden, improves power supply quality, and minimizes line losses. It is especially beneficial for applications with long-distance power supply, such as in mining and metallurgy.
Protection Level:​ Designed with IP54/IP55 protection ratings, its totally enclosed structure effectively resists dust and water ingress. This ensures long-term, reliable operation in harsh industrial environments characterized by moisture and dust, meeting the demanding requirements of such conditions.

Successful Stories

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.
Get Your Custom Solution & Fast Quote. Our Engineers Are Ready to Help.
Contact Us for the Precise Solution
Provide your equipment parameters, load profile, environmental conditions, and application details.
Receive the complimentary motor selection calculation, the energy efficiency analysis report, and the 3D model.
We support sample testing and operational simulation for validation.

Scroll to Top