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We offer a comprehensive portfolio including resistors, braking units, reactors, power filters, and transformers, with full customization options to meet diverse application requirements.
Variable frequency drives provide efficient motor speed control and energy management, but their high-frequency switching operation may introduce harmonic currents, voltage fluctuations, and additional electrical stress to connected equipment.
Dufew Electric Variable Frequency Drive Reactor improves VFD system performance by adding suitable impedance to the circuit. According to installation position and system requirements, it provides different protection functions for both the power supply side and motor load side.
The selection depends on whether the main electrical challenge occurs on the power supply side or motor load side.
When installed on the input side of a VFD, the reactor helps improve power quality, reduce harmonic influence, and limit transient current impact.
When installed on the output side of a VFD, it helps optimize motor-side electrical conditions, reduce switching-related stress, and improve drive system reliability.
Manufactured with low-loss cold rolled silicon steel cores, Class F insulation materials, vacuum impregnation technology, and optimized winding structures, Dufew reactors provide stable inductance performance, reliable thermal characteristics, and long-term industrial durability.
Different industrial environments require different reactor configurations. Dufew provides application-based solutions according to the actual operating conditions, system structure, and electrical requirements, helping improve both power-side and motor-side performance.
Installed between the power supply and VFD input terminals, the input-side configuration is mainly used to improve the electrical environment of the drive system. It helps reduce the impact of harmonic current and input surge current while improving power supply stability and limiting interference that may affect PLCs, sensors, and other control equipment.
This configuration is suitable for industrial facilities with multiple VFD systems, equipment operating under unstable power conditions, and applications where improved power quality is required.
Installed between the VFD output terminals and motor, the output-side configuration focuses on improving motor-side operating conditions. It helps reduce PWM switching stress, improve output waveform quality, and limit electrical disturbance, supporting more stable and reliable motor operation.
Typical applications include long-distance motor connections, heavy-duty machinery, and equipment where improved motor reliability is important.
For applications affected by unstable power conditions or harmonic interference, the reactors help reduce harmonic current impact, improve power supply stability, and limit transient current changes. They can also reduce electrical interference affecting sensitive equipment, making them suitable for industrial systems with multiple drives or strict power quality requirements.
On the motor side, the reactor helps reduce electrical stress caused by high-frequency switching and improve the conditions of the output circuit. This supports reliable motor operation and can help reduce abnormal interruptions during demanding operating conditions.
Dufew reactors use low-loss cold rolled silicon steel cores, optimized magnetic circuit designs, and precision winding technology to maintain stable inductance characteristics during continuous operation. The resulting structure helps reduce magnetic loss and temperature rise while supporting reliable long-term performance.
The insulation system combines Class F insulation materials with vacuum impregnation and high-temperature curing processes. This construction improves moisture resistance, mechanical strength, and thermal durability, helping the reactor maintain reliable performance and a longer service life in industrial environments.
Dufew supports customized reactor solutions based on rated voltage, rated current, voltage drop requirements, installation structure, winding material, and protection requirements. The configuration can be adapted to different electrical parameters and cabinet layouts.
Available options include copper or aluminum windings, vertical or horizontal installation, and different protection structures such as IP00 open designs and IP20 protective enclosures. This flexibility allows the reactor to be integrated into a wide range of VFD and industrial power systems.
Dufew reactor solutions are widely used in:
| Application | Main Requirement |
|---|---|
| Variable frequency drive systems | Improve electrical stability and reliability |
| Industrial automation equipment | Reduce electrical interference |
| Pumps and fan systems | Support continuous motor operation |
| Cranes and lifting equipment | Improve reliability under dynamic loads |
| Elevators | Enhance drive system stability |
| Injection molding machines | Improve motor control performance |
| Textile machinery | Maintain stable operation |
| Industrial testing equipment | Improve electrical consistency |
The correct reactor configuration depends on the actual system requirements.
| Application Condition | Recommended Solution |
|---|---|
| Poor power quality or harmonic interference | Input-side reactor |
| Multiple VFDs sharing one power source | Input-side reactor |
| Motor protection requirement | Output-side reactor |
| Long-distance motor connection | Output-side reactor |
| Frequent acceleration and deceleration | Output-side reactor |
| Complete VFD system optimization | Customized reactor solution |
Dufew provides engineering support to recommend suitable specifications according to voltage, current, installation position, and operating environment.
Selecting the right reactor requires consideration of the VFD parameters, actual system conditions, and required protection level. Matching these factors with the reactor's electrical and mechanical characteristics helps ensure stable operation and proper integration into the drive system.
Key VFD parameters include rated voltage, rated current, motor power, and operating frequency. These values determine the basic electrical requirements of the reactor and should be matched with the drive system specifications.
The installation position, power supply condition, motor connection distance, load characteristics, and operating environment should also be evaluated. For example, long motor cables, frequent load changes, or demanding industrial environments may require a different reactor configuration.
The required protection function is another important consideration. Depending on the application, the reactor may be selected to reduce harmonic impact, improve power stability, provide motor-side protection, meet specific voltage drop requirements, or support continuous operation under demanding loads.
| Parameter | Specification |
|---|---|
| Product Type | Variable Frequency Drive Reactor |
| Application | Input / Output Side VFD Applications |
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Rated Current | 5A - 3800A |
| Phase | Single Phase / Three Phase |
| Frequency | 50Hz / 60Hz / Customized up to 500Hz |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Winding Material | Copper / Aluminum |
| Installation Type | Vertical / Horizontal |
| Cooling Method | Natural Air Cooling |
| Overload Capability | 1.5 times rated current for 60 seconds |
| Dielectric Strength | 3000VAC / 50Hz / 5mA / 1Min |
| Insulation Resistance | ≥100MΩ (1000VDC) |
| Protection Grade | IP00 / IP20 |
| Insulation Class | Class F (155℃) |
| Flame Retardant Grade | UL94V-2 |
| Noise Level | ≤65dB |
| Service Life | ≥15 years |
| Standards | IEC289 / GB10229 / JB9644 |
Example: CAL-4321-0250-EISA
| Code | Description |
|---|---|
| CAL | AC Reactor Series |
| 4 | Voltage Level |
| 3 | Three Phase |
| 2 | Reactor Type |
| 1 | Voltage Drop |
| 0250 | Rated Current |
| EI | Core Structure |
| S/W | Installation Structure |
| A/C | Winding Material |
Dufew Electric specializes in power electronics components, including reactors, resistors, braking systems, transformers, and customized electrical solutions. Its manufacturing capabilities cover core processing, winding, insulation treatment, and electrical performance verification for different industrial applications.
The manufacturing process includes silicon steel core processing, precision coil winding, vacuum impregnation, high-temperature curing, and electrical performance testing. These processes help maintain consistent product characteristics and reliable performance during continuous operation.
Quality inspection covers insulation resistance, withstand voltage, temperature rise, and electrical performance verification. Each test provides additional verification of insulation reliability, thermal performance, and overall electrical quality.
Dufew supports customized design, OEM and ODM cooperation, and manufacturing based on customer drawings and application requirements. Technical documentation and application engineering services are also available to support product selection, system integration, and project development.
Dufew products are manufactured according to recognized industrial requirements, including:
- ISO 9001 Quality Management System
- CE compliance
- IEC289
- GB10229
- JB9644
Dufew provides export-standard packaging solutions according to product dimensions, weight, and transportation requirements.
Packaging includes:
- Shock-resistant protection
- Moisture-resistant packaging
- Export wooden cases
- Pre-shipment inspection records
These measures ensure safe transportation and reliable installation performance.
| Comparison | Variable Frequency Drive Reactor | Conventional AC Reactor |
|---|---|---|
| Application Purpose | Designed for VFD systems with harmonic and PWM characteristics | General current limiting applications |
| Frequency Adaptability | Supports 50Hz-500Hz operating conditions | Mainly designed for standard frequency |
| Motor Protection | Reduces PWM voltage stress and cable charging current | Limited motor protection capability |
| Installation Flexibility | Can be configured for input or output applications | Usually designed for a fixed application |
| Industrial Compatibility | Suitable for VFD-driven machinery | Suitable for general electrical systems |
A reactor is recommended when the VFD system experiences harmonic interference, voltage fluctuations, frequent overcurrent alarms, long motor cable distance, or motor insulation protection requirements.
Input-side installation is mainly selected for power quality improvement and harmonic reduction.
Output-side installation is mainly selected for improving motor-side electrical conditions and enhancing drive reliability.
The selection depends on system conditions, equipment requirements, and operating environment.
It can help reduce harmonic interference, voltage fluctuation, electrical stress, and unstable operation caused by demanding industrial operating conditions.
Yes. Dufew supports customized voltage, current, voltage drop, winding material, installation structure, and electrical parameters according to project requirements.
Dufew Electric provides customized AC reactor solutions for industrial drive systems with professional manufacturing capability, engineering support, and strict quality control.
From power quality improvement to motor drive optimization, Dufew helps customers improve equipment reliability, reduce electrical stress, and achieve stable long-term operation.
Contact Dufew Electric for customized reactor design and OEM cooperation.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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