Motor inverters, as conversion devices, generate a certain amount of power loss during operation. This loss varies depending on the load, control method, and the brand and specifications of the inverter. Data shows that the power loss of an inverter is about 4-5% of its capacity. Among this, the inverter section accounts for approximately 50%, the rectifier and DC circuit account for around 40%, and the control and protection circuits take up 5-15%. The 10℃ rule indicates that reducing the device temperature by 10℃ can double its reliability. Thus, lowering the temperature rise of inverters, enhancing component reliability, extending equipment life, and better serving society becomes crucial.

The common cooling methods for inverters include: natural cooling, forced air cooling, and water cooling.
Natural Cooling:
Small-capacity inverters generally use natural cooling. Their operating environment should be well-ventilated with no dust or floating particles. Such inverters are often used to drive objects like air conditioning fans and machine tool engraving machines, which require low power and have excellent operating environments.
Moreover, not all inverters using natural cooling have small capacities. For low-capacity inverters, we can choose standard heat sinks and maximize the heat dissipation area within allowable limits. The spacing between fins should be minimized to increase the surface area. For high-capacity inverters requiring natural cooling, it's recommended to use heat pipe coolers. Heat pipe coolers are highly efficient new-generation coolers combining heat pipe technology with traditional cooling methods.
Forced Air Cooling
Forced air cooling involves using one or more external fans to directly cool the device housing. Since inverters inevitably produce significant heat, especially under full-load operation and high ambient temperatures, adding one or more fans to directly cool the inverter housing can prevent overheating. This cooling method is cost-effective and allows for additional fans to enhance cooling performance without much concern for costs.
Water Cooling:
Water cooling systems have an inlet and outlet, with multiple water channels inside the cooler, effectively utilizing water's high heat absorption capacity to remove more heat. Water cooling is a common industrial cooling method but is rarely used for inverters due to its high cost, large size, and limited applicability to general-purpose inverters ranging from several kilovolt-amperes to nearly 100 kVA. Therefore, water cooling is mainly used in special applications and extremely high-capacity inverters.
Conclusion:
Regardless of the cooling method chosen, it should be based on the inverter’s capacity and power loss to select appropriate fans and coolers, achieving optimal cost-effectiveness. Additionally, environmental factors must be fully considered. For harsh environments (high temperature, high humidity, coal mines, oil fields, offshore platforms), corresponding measures must be taken to ensure reliable inverter operation. From the perspective of the inverter itself, efforts should be made to avoid adverse influences, such as sealing against dust and sand, ensuring only the cooler’s airflow path contacts outside air, and protecting internal components from salt spray and moisture through insulation and coating. On-site inverters should employ rainproof, sunproof, fog-proof, and dustproof measures. In high-temperature and humid environments, additional equipment like air conditioners can be added for cooling and dehumidification, providing a favorable environment for inverters to ensure their reliable operation.
Sunye Electric Co., Ltd. (Changsha Sunye Electric Co., Ltd. was established in 2010; Shenzhen Sunye Electric Co., Ltd. was established in 2002) is a national high-tech enterprise integrating R&D, manufacturing, and sales of inverters, industry-specific all-in-one machines, servo drives, and new energy products.
Sunye Electric owns independent intellectual property rights. Its products have passed inspections and certifications by national authoritative institutions and have obtained multiple software copyrights and IP certificates. It invests heavily every year in researching new technologies and developing new products, with many patents and software copyrights granted. The company possesses core platform technologies such as construction hoist drivers, high-performance vector inverters, servos, and permanent magnet synchronous motor controls. Its low- and medium-voltage inverters and servo drives are widely used in industries such as lifting equipment, stone processing, HVAC, machine tools, metal products, wire and cable, plastics, printing and packaging, textile and chemical fibers, building materials, metallurgy, coal mining, municipal services, and automotive applications. Guided by the philosophy of "innovation, technology, and strength," and driven by the corporate spirit of "unity, progress, pragmatism, and innovation," the company adheres to the business principle of "honesty and excellence, mutual benefit and coexistence." With a quality policy of "implementing total quality management and continuous improvement to pursue zero defects," Sunye Electric is committed to providing premium products to customers across various industries.
Address: Sunye Electric Industrial Park, No. 669 Xinsheng Road, High-Tech Zone, Changsha City
Tel/Fax: 0731-89932666 0731-89932688
Business Phone: 400-0755-731
Technical Support: 400-0755-731