Guided by the Dual Carbon goals, energy conservation and loss reduction in the industrial sector has become an absolute necessity rather than an optional choice. Centrifugal loads including fans, water pumps and compressors consume half of the industrial electricity. The conventional valve throttling method causes enormous power waste. Against this backdrop, the permanent magnet speed regulator independently developed by Anhui Voofu Permanent Magnet Technology Co., Ltd. has come into being. Featuring groundbreaking technology and more than a thousand successful application cases, it has established itself as a recognized leader in energy-saving retrofitting for high-power motors.
一、What is Voofu Permanent Magnet Speed Regulator?
The Voofu Permanent Magnet Speed Regulator (WF-T Series) is an innovative transmission and speed control device based on Lenz's law of electromagnetism. It adopts rare-earth permanent magnets and alloy conductors to transmit torque contactlessly through an air gap.
To put it simply: the motor drives a copper disc to rotate. As the disc cuts magnetic lines in the strong magnetic field generated by permanent magnets, eddy currents and an induced magnetic field are produced. The interaction between the induced field and permanent magnets acts like an "invisible hand" to drive the permanent magnet rotor, thereby transmitting power to the load. Throughout the operation, there is no physical contact between the permanent magnet rotor and the conductor rotor. Torque is delivered purely via magnetic field interaction, enabling true non-contact torque transmission.
二、Core Technology: Oil-cooled Design — Voofu's Greatest Competitive Moat
In the permanent magnet speed regulator industry, water-cooled solutions were widely adopted in the early stage. However, they have a critical flaw. Since water and oil are contained in separate chambers and isolated by dynamic shaft seals, cross-leakage between the two fluids frequently occurs after long-term operation. Infiltrated cooling water impairs bearing lubrication, leading to bearing damage and oil carbonization. Metal components are also highly prone to rust. As verified by Voofu, water-cooled units manufactured in 2015 suffered severe issues including extensive rust and cracked discs after six years of operation.
Against this backdrop, Voofu developed the oil-cooled permanent magnet speed regulator, which uses thin lubricating oil as the sole cooling medium instead of water. This seemingly simple innovation fundamentally resolves all drawbacks of water-cooled products. The single oil medium delivers superior sealing performance and completely eliminates fluid cross-leakage. The thin oil serves both cooling and lubrication purposes, greatly extending bearing service life. Additionally, the oil film fully coats metal surfaces to effectively prevent rust.
Practical evidence further proves its excellence. A WF-TW670 oil-cooled permanent magnet speed regulator produced in September 2017 was returned to the factory for maintenance and disassembly after six years of service. Its permanent magnet discs, bearings, speed regulating mechanism and housing remained spotless with no rust or cracks, while water-cooled equipment of the same vintage had long rusted out and been scrapped.
The oil cooling system consists of four coordinated components: the main oil-cooled permanent magnet speed regulator, permanent magnet junction box, thin oil station and oil station monitoring cabinet. The oil station is fitted with pumps, motors and other parts from world-renowned brands to ensure stable and high-performance operation under all working conditions. In 2025, Voofu's oil-cooled permanent magnet speed regulator was awarded the title of Anhui Premium Industrial Product, a top recognition of its outstanding technology and quality.
三、Nine Major Advantages, Taking an All-round Lead
Nine key words sum up the advantages of Voofu Permanent Magnet Speed Regulators.
High efficiency and energy saving are its most tangible merits. Fans and water pumps are centrifugal loads, whose power is proportional to the cube of rotating speed. When the speed drops to 80%, the power falls to 51.2% of the original level, cutting power consumption by nearly 50%. Unlike valve throttling, the regulator reduces speed directly to save energy at the source, delivering an overall energy saving rate of 20% to 50%. Take a thermal power plant of Guodian in Zhenjiang as an example. After retrofitting a 560 kW induced draft fan with the WF-TW850 model, the unit achieved an energy saving rate of 39%, saving 2.2458 million kWh of electricity annually with an investment payback period of merely around 10 months.
Stepless speed regulation enables precise control. It supports continuous stepless adjustment within the range of 30% to 97%. Compatible with 4-20 mA signal connection to DCS or PLC systems and PID closed-loop control, it responds to working condition changes in real time.
Soft start protects motors and power grids. The unit starts at the maximum air gap, cutting current inrush by over 50% and preventing damage to motor windings and power grids caused by conventional direct startup.
Vibration isolation extends service life. The non-mechanical connection reduces system vibration by 50% to 85%, greatly mitigating fatigue damage to equipment and pipeline systems.
Maintenance-free design slashes operational costs. Featuring a simple structure with few wearing parts except bearings, it lowers maintenance expenses by more than 80%.
Ultra-long service life secures investment returns. It is designed to last 25 to 30 years. An oil-cooled unit at an aluminum enterprise in Yunnan has run fault-free for a decade, and a heating network circulating pump at a power plant in Northeast China has operated trouble-free for nearly ten years since commissioning in 2016.
Adaptability to harsh environments outperforms frequency converters. It operates stably amid grid voltage fluctuations, extreme temperatures, heavy dust, as well as flammable and explosive working conditions.
Zero harmonic pollution keeps power grids clean. As a purely mechanical transmission device, it generates no high-order harmonics and causes no grid pollution. It also avoids the overheating issue of motors at low speeds, a common problem with frequency converters.
Eco-friendliness supports the Dual Carbon goals. It produces no pollutants. Every 100 kW of installed capacity can reduce carbon dioxide emissions by 160,000 to 400,000 kilograms per year.
四、Numerous cases covering all industries
Voofu permanent magnet speed regulators have achieved over a thousand successful applications across power, chemical, cement, metallurgy, coal, military and other industries, covering the full power range from several hundred kilowatts up to 5,000 kilowatts.
In the power industry, a power plant in Suzhou, Anhui retrofitted its slurry circulating pump with the TW950 model which delivers a torque of over 35,000 N·m. The solution realizes speed regulation and energy saving without compromising desulfurization performance. Another power plant in Shanxi adopted 110 kW direct-drive permanent magnet units for its air cooling island, achieving an energy saving rate of 20% to 39%.
In the cement industry, a cement plant upgraded its 132 kW cooling tower with the WF-TM470 model. The energy saving rate reached 39% in summer and exceeded 50% in winter, saving 646,800 kWh of electricity annually and cutting carbon dioxide emissions by over 640 tons.
In the petrochemical industry, a petrochemical enterprise installed 90 kW explosion-proof units for cooling towers in hazardous areas. The equipment reduces power consumption by 13 kW per hour with a current drop of 22.1%, operating safely and reliably in explosive environments.
In the non-ferrous metal sector, the oil-cooled permanent magnet speed regulator deployed by an aluminum enterprise in Yunnan has set an industry benchmark with ten years of fault-free operation.
五、Why Choose Voofu Over Frequency Converters?
Many customers hesitate between permanent magnet speed regulators and frequency converters during selection. In fact, the two are fundamentally different in applicable scenarios.
Frequency converters adjust speed by changing power frequency. As a power electronic solution, they deliver precise speed regulation yet generate severe harmonics. They require a clean, temperature-controlled indoor environment, boast a service life of only 8 to 10 years, and entail high upfront investment and maintenance costs.
In contrast, the Voofu permanent magnet speed regulator adopts a purely mechanical transmission design. It produces no harmonics, tolerates grid voltage fluctuations, features a service life of up to 30 years and requires minimal maintenance, performing reliably even in harsh conditions.
For energy-saving retrofits of centrifugal loads such as fans and water pumps, Voofu enjoys a decisive advantage in total life-cycle cost, with an investment payback period of merely 6 to 12 months.
六、Enterprise strength
Voofu is a national Specialized, Refined, Unique and Innovative "Little Giant" Enterprise and a National Intellectual Property Advantage Enterprise. It has filed more than 300 patents, and led or participated in the formulation of 3 national standards and 2 industrial standards.
The company owns a 30,000-square-meter production base in Hefei, Anhui Province, and has jointly established the Permanent Magnet Drive Industry Technology Innovation Center with Soochow University.
Its products are included in the National Catalog of Recommended Industrial Energy-Saving Technologies and listed in the first batch of advanced and applicable technologies of 2025 issued by the Ministry of Industry and Information Technology. A full range of products have obtained explosion-proof, 3C and MA safety certifications for coal mine use.
Conclusion
Backed by proven decade-long fault-free operation and national authoritative certifications, along with over a thousand field applications and tangible power savings of 20% to 50%, Voofu permanent magnet speed regulators have proven with technology and data to be the optimal solution for energy-saving retrofits of high-power motors.
If you are seeking a speed control and energy-saving solution that delivers 20%–50% power savings, boasts a 30-year service life, requires minimal maintenance and adapts to all harsh environments, Voofu permanent magnet speed regulators are well worth your attention.
Official Website: www.wolfelc.com
Anhui Base: No. 3169 Jimingshan Road, High-tech Zone, Hefei City
