一、Company Profile
Anhui Voofu Permanent Magnet Technology Co., Ltd. was founded in 2010, located at No. 3169 Jimingshan Road, Tanggang Center, Hefei High-Tech Zone, Anhui Province. The company owns a self-built production base covering an area of 30,000 square meters in the zone. Positioned as a comprehensive energy technology service provider, it takes efficient energy utilization and energy conservation & consumption reduction as its mission, and strives to become a leading enterprise in China's permanent magnet drive and transmission technology sector.
Looking back on its development history, Voofu launched the production of permanent magnet governors right after its establishment in 2010. In 2011, mass production of the 2000kW vertical permanent magnet governor was realized. By 2013, the company had established a sales network covering all 31 provincial capitals across China. In 2015, its new factory, R&D center and testing center in Shanghai were officially put into operation. In the same year, the company was included in the Cultivation Program for Science and Technology Little Giant Enterprises and passed the certification of three major ISO management systems.
Since then, Voofu has entered a period of rapid growth. The 4500kW oil-cooled permanent magnet governor was put into production in 2018. In 2019, the 5000kW oil-cooled model was launched and put into service, while provincial and municipal government funds were introduced. In 2020, the company obtained the Integration of Informatization and Industrialization Management System Certification issued by the Ministry of Industry and Information Technology of China, and its oil-cooled technology was appraised as a domestically leading scientific and technological achievement.
From 2021 onwards, Voofu successively obtained the recognition of the First Set of Major Technical Equipment of Anhui Province and was listed in the National Recommended Catalogue of Industrial Energy-Saving Technologies. By 2023, the company had led and participated in the formulation of 3 national standards and 2 industrial standards, and acquired the Grade II Qualification for General Contracting of Electromechanical Engineering Construction. It was certified as a Digital Workshop in 2024, and multiple product lines obtained certifications for explosion protection, 3C and coal mine safety.
In 2025, Voofu's products were included in the first batch of Advanced and Applicable Technologies released by the Ministry of Industry and Information Technology. The second-phase factory building was put into use, and the oil-cooled permanent magnet governor was awarded the title of "Anhui High-quality Industrial Product". As of 2026, Voofu's permanent magnet synchronous motors have obtained the Class 1 Energy Efficiency Label, and its products have been successfully applied in more than 3,000 projects in total.
In terms of corporate honors, Voofu is a National Specialized, Refined, Differential and Innovative Little Giant Enterprise and a National Intellectual Property Advantage Enterprise. It has filed over 300 patents in total, nearly 200 of which are currently in force. The company has also joined hands with Soochow University to build the Industrial Technology Innovation Center for Permanent Magnet Transmission, achieving in-depth integration of industry, academia and research.
二、Product Overview
The Voofu Permanent Magnet Governor (WF-T Series) is a revolutionary transmission and speed regulation device. Based on Lenz's Law of electromagnetism, it adopts rare-earth permanent magnets and alloy conductors to transmit torque in a non-contact manner through air gaps. Its core feature is that there is no physical or mechanical connection between the permanent magnet rotor and the conductor rotor, and torque is transmitted purely by magnetic fields across the gap.
Voofu Permanent Magnet Governor boasts a comprehensive product lineup, catering to full power requirements ranging from several hundred kilowatts to 5,000 kilowatts. The WF-TW horizontal oil-cooled model serves as the mainstream unit for high-power applications above 630kW, while the WF-TY vertical oil-cooled model is designed for vertical installation. For medium and low-power scenarios, the company offers WF-TV vertical air-cooled type and WF-TM horizontal air-cooled type.
In addition, our product portfolio includes the tubular permanent magnet governor WF-TT, flagship oil-cooled models WF-TW850/TW950 (with torque exceeding 35,000 Nm), permanent magnet coupling series (WF-SN/WF-CV/WF-CP), and low-speed direct-drive permanent magnet motor series (WF-DQ/WF-GS/WF-XF/WF-KD).
In terms of core technical parameters, the power range of Voofu Permanent Magnet Governor spans 0 to 5,000kW. It supports stepless speed regulation from 30% to 97%. The device allows 4-20mA signal access to DCS/PLC systems and realizes PID closed-loop control. It features a design service life of 25 to 30 years, with an overall energy-saving rate of 20% to 50%. It can reduce system vibration by 50% to 85% and keep operating noise below 95dB. It is applicable to environments with an altitude up to 4,000 meters, ambient temperature from -40℃ to +50℃, and relative humidity no more than 100%.
三、Working Principle
The core working principle of Voofu Permanent Magnet Governor is eddy current coupling transmission. Specifically, the motor drives the conductor disc to rotate. As the disc cuts magnetic lines in the strong magnetic field generated by the permanent magnet rotor, eddy currents are produced on its surface in accordance with Faraday's law of electromagnetic induction. These eddy currents further create an induced magnetic field on the disc. Based on Lenz's law, attractive and repulsive forces arise between the induced magnetic field and the permanent magnets. The combined forces in the rotating direction form a net driving torque, which pulls the permanent magnet rotor to rotate in the same direction, realizing non-contact torque transmission from the motor to the load.
During operation, the permanent magnet rotor is connected to the load shaft and the conductor rotor to the motor shaft. The two rotors are coupled merely via the magnetic field across the air gap without any mechanical contact. Speed regulation is achieved by adjusting the air gap between them. A smaller air gap means a stronger magnetic field, larger eddy currents and higher transmitted torque, resulting in a higher load speed; a larger air gap produces the opposite effect. Driven by an electric actuator, the air gap adjusting mechanism enables stepless speed regulation within the range of 30% to 97%. When the motor runs at full speed, the slip is only 1% to 3%, delivering extremely high efficiency.
In terms of energy saving, fans and water pumps are typical centrifugal loads, whose power is proportional to the cube of rotational speed. When the speed drops from 100% to 80%, the power decreases to 51.2% of the original level, saving nearly 50% of electricity. When the speed falls to 70%, the power is only 34.3% of the original, with a power saving rate of over 65%. Unlike the traditional throttling method using valves or dampers — where the motor keeps running at full speed and a large amount of energy is wasted on throttling components — the permanent magnet governor reduces the operating speed directly to save energy at the source. This accounts for its overall energy saving rate of 20% to 50%.
四、Core Technology
Voofu's most competitive core technology is its original oil-cooled solution. At a time when water-cooled designs were widely adopted across the industry, Voofu developed permanent magnet governors that use thin oil instead of water as the cooling medium. This innovation has become the core technological moat that sets Voofu apart from all competitors.
Water-cooled permanent magnet governors suffer from a common industry defect. Water and oil are contained in separate chambers isolated by dynamic shaft seals, which are prone to cross-leakage after long-term operation. Cooling water may seep into bearings and cause lubrication failure, leading to bearing damage and oil carbonization. Metal components are also highly susceptible to rust. Practical evidence from Voofu shows that water-cooled units delivered in 2015 developed severe issues including extensive rusting and disc cracking after six years of service.
Voofu's oil-cooled technology completely eliminates the above problems. The system uses a single oil medium with reliable sealing, so oil-water cross-leakage never occurs. The thin oil serves both cooling and lubrication purposes, greatly extending bearing service life. An oil film fully coats metal surfaces to deliver effective anti-rust protection. A solid field case proves its superior performance: a WF-TW670 oil-cooled permanent magnet governor shipped in September 2017 was disassembled for factory maintenance after six years of continuous operation. Its permanent magnet discs, bearings, speed regulating mechanism and housing remained spotless with no rust or cracks whatsoever.
The oil-cooled system consists of four major parts: the main unit of oil-cooled permanent magnet governor, permanent magnet junction box, lube oil station and lube oil station monitoring cabinet. The oil station is equipped with pumps, motors and other components from world-renowned brands to guarantee outstanding performance and high operational reliability.
In terms of structural design, Voofu applies a proprietary single-disc semi-cage structure, cutting rotor weight by nearly two-thirds. This design delivers lower vibration and higher reliability even at a high speed of 3000 rpm. Additionally, Voofu obtained a new patent for the mobile base type magnetic wheel governor in 2025, which further improves speed regulation accuracy and reduces friction loss.
For intelligent control, Voofu permanent magnet governors support 4-20mA signal connection to DCS/PLC systems and PID closed-loop automatic control. The units respond to working condition changes in real time to precisely match load requirements.
The product is equipped with multiple safety protection functions. It adopts maximum air gap startup to realize soft start, cutting inrush current by over 50%. In case of load stalling, the air gap automatically widens instantly to provide overload slip protection. The non-contact transmission reduces system vibration by 50% to 85%. No sparks are generated in the main power section, making it suitable for flammable and explosive environments. As a purely mechanical transmission device, it produces no harmonics and causes no pollution to the power grid.
五、Product Advantages
The advantages of Voofu Permanent Magnet Governor can be illustrated from nine aspects.
1. High Efficiency and Energy Saving
It delivers an overall energy saving rate of 20% to 50%. Taking a thermal power plant of Guodian Zhenjiang as a practical example: after a 560kW induced draft fan was retrofitted with the WF-TW850 unit, the energy saving rate reached 39%, with annual power savings of 2.2458 million kWh and an investment payback period of merely around 10 months. A single 1600kW unit can save over 2 million kWh of electricity per year.
2. Stepless Speed Regulation
It enables precise speed adjustment within the range of 30% to 97% with fast response, and supports PID closed-loop control.
3. Soft Start
The unit starts with the maximum air gap, cutting the inrush current by more than 50% and effectively extending the service life of the motor.
4. Vibration Isolation
The non-mechanical connection design reduces vibration by 50% to 85%, greatly alleviating impact on equipment and pipelines.
5. Maintenance-free Operation
Featuring a simple structure, it has no wearing parts except bearings, slashing maintenance costs by over 80%.
6. Ultra-long Service Life
The designed service life is 25 to 30 years. An oil-cooled unit deployed at an aluminum enterprise in Yunnan has operated trouble-free for a decade. A heating network circulating pump at a power plant in Northeast China has run stably for nearly ten years since its commissioning in 2016 without any quality issues.
7. Strong Adaptability to Harsh Environments
The governor works steadily under fluctuating grid voltage, extreme temperatures, heavy dust, high humidity, as well as flammable and explosive conditions, outperforming frequency converters in this regard.
8. Zero Harmonics
As a purely mechanical transmission device, it generates no higher harmonics and causes no grid pollution. It also avoids the motor overheating issue caused by poor heat dissipation of frequency converters at low speeds.
9. Eco-friendly Performance
It produces no pollutants. Every 100kW of installed capacity can reduce carbon dioxide emissions by 160,000 to 400,000 kilograms annually, contributing to the national dual-carbon goals.
Compared with frequency converters and fluid couplings, Voofu Permanent Magnet Governor boasts prominent advantages across multiple indicators. Though capable of speed regulation, frequency converters generate severe harmonics, require a clean and thermostatically controlled air-conditioned room, only have a service life of 8 to 10 years, and entail high initial investment and maintenance costs. Fluid couplings suffer from low efficiency and oil leakage problems, with a service life of roughly 10 to 15 years. In contrast, Voofu Permanent Magnet Governor features a service life of 25 to 30 years, maintenance-free performance and outstanding durability in harsh environments, achieving the lowest total cost over its 30-year full lifecycle.
六、Application Cases
Voofu Permanent Magnet Governors have been applied in energy-saving renovation projects for high-power motors up to 5,000kW across various industries including electric power, chemical engineering, cement, metallurgy, coal and national defense.
Electric Power Industry
A thermal power plant of Guodian Zhenjiang retrofitted a 560kW induced draft fan with the WF-TW850 model, achieving an energy saving rate of 39%. The annual power saving reached 2.2458 million kWh with an investment payback period of approximately 10 months. A heating network circulating pump equipped with WF-TW850 (1600kW/1486rpm) at a power plant in Northeast China has operated fault-free for nearly ten years since it was put into service in 2016. A power plant of Huadian Suzhou in Anhui adopted the TW950 model with a torque exceeding 35,000 Nm to renovate slurry circulating pumps, realizing speed regulation and energy saving without compromising desulfurization efficiency. Besides, a power plant in Shanxi upgraded its air cooling island with 110kW direct-drive permanent magnet products, delivering an energy saving rate of 20% to 39% and an annual power saving of 130,000 to 333,000 kWh.
Cement & Chemical Industry
A cement enterprise adopted the air-cooled WF-TM470 to renovate its 132kW cooling tower. The energy saving rate hit 39% in summer and over 50% in winter, with an annual power saving of 646,800 kWh and a carbon dioxide emission reduction of more than 640 tons. After the 110kW cooling tower renovation at another cement plant, the energy saving rate reached 20% with a current drop of 19A, saving 114,000 kWh annually. A petrochemical enterprise in Zhanjiang retrofitted its 200kW cooling tower fan with TM600, which runs steadily with remarkable energy-saving performance. A domestic petrochemical company installed 90kW explosion-proof units for cooling towers in hazardous areas, cutting power consumption by 13kW per hour and reducing electric current by 22.1%. The equipment operates safely and reliably in explosive environments. The oil-cooled permanent magnet governor deployed at an aluminum enterprise in Yunnan has set a benchmark with ten years of trouble-free operation.
Coal & Mining Industry
Voofu's low-speed direct-drive permanent magnet motors and permanent magnet pulleys are widely used in this sector, effectively meeting the energy-saving demands of belt conveyors, hoists and other equipment.
七、Selection Guide
For model selection, first determine the product type according to the installation mode and power range. For medium and low-power applications below 630kW, select the air-cooled WF-TM for horizontal installation and the air-cooled WF-TV for vertical installation. For high-power applications above 630kW, the oil-cooled WF-TW is recommended for horizontal installation and the oil-cooled WF-TY for vertical installation. The WF-TW950 serves as the flagship model for ultra-high power requirements with torque exceeding 35,000 Nm.
In terms of operating conditions, centrifugal loads such as fans and water pumps are the ideal application scenarios for permanent magnet governors, which deliver both stepless speed regulation and substantial energy savings. In harsh working conditions including flammable and explosive environments, severe grid voltage fluctuations, high temperature and heavy dust, permanent magnet governors enjoy overwhelming advantages over frequency converters. If precision speed regulation equivalent to that of frequency converters is required, a variable frequency solution is applicable. However, if high reliability, long service life and low maintenance costs are prioritized, permanent magnet governors are the better choice. For scenarios requiring low-speed and high-torque direct drive, Voofu WF-DQ low-speed direct-drive permanent magnet motors are the optimal solution.
A complete oil-cooled system consists of four components: the main body of oil-cooled permanent magnet governor, permanent magnet junction box, lube oil station and lube oil station monitoring cabinet. These components work in tandem to ensure stable equipment operation under all working conditions.
Conclusion
Adopting the disc-type symmetrical oil-cooled structure and non-contact magnetic torque transmission technology, Voofu Permanent Magnet Governor ranks among the industry's top tier in the field of high-power permanent magnet speed regulation. As a National Specialized, Refined, Differential and Innovative Little Giant Enterprise, our technology has been recognized as a domestically leading scientific and technological achievement by the Ministry of Industry and Information Technology. With over 3,000 successful application cases and proven ten years of trouble-free operation, Voofu has proven with technology and practical data that it is the optimal solution for energy-saving renovation of high-power motors.
If you are looking for a speed regulation and energy-saving solution that delivers 20% to 50% power savings, features a 30-year service life, requires minimal maintenance and adapts to various harsh environments, Voofu Permanent Magnet Governor is well worth your attention.
Official Website: www.wolfelc.com
Anhui Base: No. 3169 Jimingshan Road, Hefei High-Tech Zone
Business Cooperation: service@wolfelc.com
Voofu Permanent Magnet: the optimal solution for energy-saving renovation of high-power motors, supporting the national dual-carbon goals.
