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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.
The VFD DC Link Reactor is connected in series within the intermediate DC bus circuit between the rectifier bridge and inverter stage of a VFD system.
During AC-to-DC conversion, rectifier operation and load variation can introduce current ripple and electrical fluctuation into the DC bus. The reactor uses inductive energy storage characteristics to smooth current changes, maintain continuous DC current flow, and improve the stability of the inverter power supply.
Unlike standard AC reactors, DC Link Reactors are designed to operate under continuous DC current conditions. Dufew adopts a DC bias-resistant segmented air-gap magnetic structure to maintain stable inductance and reduce the risk of magnetic saturation.
The reactor features:
- Low-loss cold rolled silicon steel core for reduced magnetic loss
- Segmented air-gap structure for stable DC operation
- Class F insulation system for high-temperature reliability
- Vacuum impregnation process for mechanical strength and moisture resistance
- Copper or aluminum winding options for different current requirements
These design features make Dufew DC Link Reactors suitable for VFD systems requiring stable DC bus performance, long service life, and reliable operation.
The rectifier stage naturally generates ripple components in the DC current. A DC Link Reactor smooths the current waveform, reduces ripple current, and helps maintain continuous current conduction, providing a more stable input to the inverter. This reduces fluctuations in the DC power supply and supports consistent motor operation.
Excessive ripple current can increase capacitor heating and accelerate component aging. By reducing charging stress and the thermal load on DC bus components, the reactor can help extend capacitor service life, improve overall component reliability, and reduce maintenance requirements.
Industrial equipment often operates under frequent acceleration, braking, and load changes. The reactor helps maintain stable inverter operation and reduce the electrical impact of rapid load variation, while supporting the reliable operation of power semiconductor devices.
By improving DC bus characteristics and reducing current distortion, the reactor helps optimize power utilization and limit the influence of harmonics. This makes it suitable for high-power industrial drive systems where stable electrical performance is required.
Continuous DC current can produce magnetic bias and increase the risk of core saturation in conventional reactor designs. Dufew's segmented air-gap technology provides more stable inductance and improved magnetic linearity, helping reduce saturation risk and maintain reliable operation under continuous DC conditions.
The winding structure is designed for high-current DC operation and can use copper or aluminum conductors according to application requirements. Low resistance loss and controlled temperature rise contribute to stable long-term performance. For high-current models, foil winding structures can also be used to improve heat dissipation while maintaining a compact installation design.
The vacuum impregnation process strengthens the insulation system and improves mechanical stability, moisture resistance, and vibration resistance. This treatment helps maintain reliable electrical and mechanical performance during long-term industrial operation.
Dufew DC Link Reactor solutions are widely used in industrial power conversion and motor drive systems.
| Application | Main Requirement |
|---|---|
| Variable frequency drive systems | Reduce DC ripple and improve drive reliability |
| Servo drive systems | Improve DC bus stability during dynamic operation |
| Elevators | Support frequent acceleration and braking cycles |
| Port cranes and lifting equipment | Enhance reliability under heavy-load conditions |
| Rolling mills | Reduce electrical stress during continuous operation |
| Injection molding machines | Improve motor drive stability |
| Wire drawing machines | Maintain smooth power transmission |
| Textile machinery | Support stable long-term operation |
| Testing systems | Improve electrical consistency |
A DC Link Reactor is recommended when the VFD system experiences:
| System Condition | Recommended Purpose |
|---|---|
| Frequent DC current fluctuation | Reduce ripple current |
| Voltage-source VFD with capacitor filtering | Protect DC bus capacitors |
| Large-capacity transformer supply | Improve power stability |
| Three-phase voltage imbalance | Reduce electrical stress |
| Frequent acceleration and deceleration | Improve inverter reliability |
| High power quality requirements | Reduce harmonic impact |
Example: CDL-600-0600-EIDA
| Code | Description |
|---|---|
| CDL | DC Link Reactor Series |
| 600 | Voltage Level (600 = 690VDC) |
| 0600 | Rated Current (0600 = 600A, 2500 = 2500A) |
| EI | Core Structure (EI = Three-phase Core, UI = Single-phase Core) |
| D | Installation Structure (D = Vertical Installation, W = Horizontal Installation) |
| A | Winding Material (A = Aluminum, C = Copper) |
| Parameter | Specification |
|---|---|
| Product Type | VFD DC Link Reactor |
| Installation Position | DC bus circuit between rectifier and inverter |
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Operating Frequency | 50Hz / 60Hz / Customized up to 500Hz |
| Rated Current | 5A - 3800A |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Overload Capability | 1.5 times rated current for 60 seconds, interval 1 hour |
| Dielectric Strength | 3000VAC / 50Hz / 5mA / 1Min |
| Insulation Resistance | ≥100MΩ at 1000VDC |
| Protection Grade | IP00 / IP20 |
| Insulation Class | Class F (155℃) |
| Flame Retardant Grade | UL94V-2 |
| Noise Level | ≤65dB (tested at 1 meter horizontal distance) |
| Service Life | ≥15 years |
| Applicable Standards | IEC289:1987 / GB10229-88 / JB9644-1999 |
Dufew Electric specializes in customized power electronics components, including DC Link Reactors, AC Reactors, braking resistors, transformers, and related electrical solutions.
With professional engineering capability and controlled manufacturing processes, Dufew provides reliable reactor solutions for VFD systems, industrial automation, and power conversion applications.
Dufew production includes:
- Precision silicon steel core processing
- Segmented air-gap magnetic structure manufacturing
- Copper and aluminum winding production
- Vacuum impregnation treatment
- High-temperature curing process
- Electrical performance testing
Each reactor undergoes strict inspection procedures, including:
| Inspection Item | Purpose |
|---|---|
| Insulation resistance testing | Verify insulation reliability |
| Dielectric withstand testing | Confirm electrical safety performance |
| Inductance testing | Ensure required reactor characteristics |
| Temperature rise testing | Verify thermal performance |
| Noise testing | Control operating noise level |
| Appearance inspection | Confirm manufacturing quality |
Dufew provides customized solutions based on rated voltage, current range, inductance, voltage drop, installation structure, cabinet space, and winding material requirements. The design can be adapted to different electrical and mechanical conditions to ensure proper integration with the customer's drive system.
Services cover OEM manufacturing, customized reactor design, technical documentation, and application engineering support, helping customers address specific project requirements from product selection through system integration.
Dufew products are manufactured according to recognized industrial standards and quality requirements.
Applicable standards include:
| Standard | Description |
|---|---|
| ISO 9001 | Quality Management System |
| IEC289:1987 | Reactor Standard |
| GB10229-88 | Reactor Standard (Equivalent to IEC289:1987) |
| JB9644-1999 | Reactor for Semiconductor Electrical Drives |
| CE | Product compliance requirement |
Dufew provides export-standard packaging solutions to ensure safe transportation and reliable product performance.
- Moisture-resistant protection
- Shock-resistant fixing structure
- Reinforced export wooden cases for large reactors
- Product labels and technical documents
- Pre-shipment inspection records
Each unit is inspected before delivery to ensure that electrical parameters and mechanical requirements meet customer specifications.
Dufew supports:
- Batch production
- OEM projects
- International shipment
- Customized packaging requirements
| Comparison Dimension | VFD DC Link Reactor | Standard Three-Phase AC Reactor |
|---|---|---|
| Installation Position | Installed in the DC bus section between rectifier and inverter | Installed on AC input side or AC output side of VFD systems |
| Magnetic Core Design | Segmented air-gap core designed for DC current with AC ripple components | Conventional magnetic core designed for symmetrical AC magnetic flux |
| Main Function | Smooth DC current ripple, improve DC bus stability, reduce stress on DC components | Reduce AC harmonics, limit surge current, and improve AC waveform quality |
| Operating Condition | Works under DC bias conditions and requires saturation-resistant design | Operates under alternating AC magnetic conditions |
| Typical Application Value | Protects DC capacitors and improves inverter operating stability | Improves AC-side power quality and motor-side protection |
A DC Link Reactor is installed in the DC bus circuit to smooth current fluctuation and reduce ripple stress on DC components. An AC Reactor is installed on the AC side to control input harmonics or output electrical stress. Their installation positions and design requirements are different.
It is recommended for VFD systems with large power ratings, significant DC current ripple, frequent load changes, or applications requiring improved DC bus stability.
By limiting ripple current and reducing charging current fluctuation, the reactor lowers thermal and electrical stress on DC capacitors, helping improve their reliability and service life.
Yes. Dufew supports customization of rated voltage, current capacity, inductance value, voltage drop, winding material, dimensions, and installation configuration according to project requirements.
Dufew Electric provides customized DC Link Reactor solutions for industrial VFD systems, power conversion equipment, and automation applications.
With professional engineering capability, advanced manufacturing processes, and strict quality control, Dufew helps customers improve DC bus stability, reduce electrical stress, and achieve reliable long-term operation.
Contact Dufew Electric for customized reactor design, OEM cooperation, and project support.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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