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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 Output Filter is installed between the VFD output terminals and motor input terminals to improve the quality of electrical signals transmitted to the motor.
By combining multi-stage filtering circuits with optimized magnetic components, it attenuates high-frequency switching interference generated by PWM inverter operation and reduces electrical stress at motor terminals.
The design helps minimize:
- High-frequency harmonic components
- Voltage spike pulses caused by fast switching
- dv/dt stress on motor insulation
- Electromagnetic interference through motor cables
The insulation system provides:
- Line-to-line: 1500VDC / 60S
- Line-to-ground: 2500VDC / 60S
With insulation resistance above 100MΩ, overload capability of 1.4 times rated current for 1 minute, and support for motor cable distances up to 400m with shielded cables, Dufew solutions are suitable for demanding industrial drive systems.
| Parameter | Specification |
|---|---|
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Operating Frequency | 50Hz / 60Hz / Up to 500Hz |
| Rated Current | 5A - 1600A |
| Dielectric Strength | Line-to-line: 1500VDC (60S); Line-to-ground: 2500VDC (60S) |
| Insulation Resistance | ≥100MΩ (1000VDC) |
| Overload Capability | 1.4 times rated current for 1 minute (interval ≥15 minutes) |
| Maximum Cable Length | Shielded cable: 400m; Unshielded cable: 300m |
| Protection Grade | IP00 / IP20 |
| Insulation Class | T40 / Class F (155℃) |
| Flame Retardant Grade | UL94V-2 |
| Product Standard | GB/T15287/8 |
CAF-4 3 2-0600
| Code | Description |
|---|---|
| CAF | Dufew Electric Filter Series |
| 4 | Voltage Level (2 = 220V, 4 = 380V, 6 = 690V) |
| 3 | Phase Number (3 = Three-phase, 1 = Single-phase) |
| 2 | Filter Type (1 = Input Filter, 2 = Output Filter) |
| 0600 | Rated Current (0600 = 600A) |
Long motor cables can introduce distributed capacitance, which may increase charging current and high-frequency interference. The optimized magnetic circuit design helps reduce the impact of cable capacitance, improve output waveform stability, and reduce high-frequency radiation, making the filter suitable for remote motor installations. It supports shielded cables up to 400m and unshielded cables up to 300m.
PWM switching operation can generate rapid voltage rise and high-frequency stress on motor windings. The output filter helps reduce dv/dt impact and voltage spike stress, limiting insulation aging caused by switching pulses and improving overall motor service reliability.
The multi-stage filtering structure helps suppress high-frequency switching noise as well as common-mode and differential-mode interference. This can improve EMC performance and reduce interference in systems equipped with sensitive control and monitoring equipment.
The filtering design primarily targets high-frequency components while maintaining the fundamental frequency energy required for normal motor operation. This helps maintain stable motor torque output, minimize additional losses, and support reliable continuous operation.
The compact design supports both vertical and horizontal installation and can accommodate different cabinet layouts. Customized voltage and current ratings are also available to meet specific industrial applications and OEM project requirements.
Dufew Output Filter is suitable for applications where motor cable lengths exceed 50 meters, as well as high-precision servo machining equipment, multi-motor synchronous drive systems, and production lines equipped with sensitive inspection equipment. It is also suitable for cranes and injection molding equipment that require frequent acceleration and braking.
Typical applications include industrial automation, CNC machinery, elevators, port equipment, textile machinery, injection molding machines, and testing systems.
| Comparison Dimension | Dufew Professional Output Filter | Standard Output Filtering Solution |
|---|---|---|
| Filtering Structure | Multi-stage filtering design for PWM switching interference | Simple filtering structure with limited frequency attenuation |
| Main Application | Motor-side harmonic suppression and dv/dt stress reduction | Basic output waveform improvement |
| Long Cable Capability | Supports long-distance motor cable applications up to 400m shielded cable | Performance may decrease with extended cable distance |
| Motor Protection | Helps reduce insulation stress caused by switching voltage pulses | Limited protection against high-frequency stress |
| System Integration | Suitable for precision and industrial drive systems | Mainly used for general applications |
Dufew Electric specializes in industrial power electronics components, including filters, reactors, braking resistors, and customized electrical solutions.
With engineering experience in magnetic components and drive system applications, Dufew provides customized solutions for different voltage levels, current ranges, and installation requirements.
Dufew's manufacturing capabilities cover magnetic component processing, precision winding, insulation treatment, electrical parameter verification, and performance testing, ensuring consistent production quality and reliable product performance.
Quality control includes insulation resistance, dielectric withstand, temperature rise, electrical performance, and appearance inspections. Each stage is designed to verify the electrical safety, operating stability, and overall quality of the finished products.
Dufew supports OEM manufacturing, customized designs, technical documentation, and application engineering support to meet different industrial requirements. Quality documentation includes ISO quality management certification, CE certification, and product testing reports.
Dufew applies export-standard packaging to ensure safe transportation of industrial electrical components.
Packaging solutions include:
- Moisture-resistant protection
- Shock-resistant fixing
- Reinforced wooden cases for large models
- Product identification labels
- Technical documents
Each product is inspected before shipment to ensure compliance with customer requirements.
An output filter mainly targets high-frequency switching components, PWM interference, and electromagnetic noise at the motor side. An output reactor mainly reduces voltage rise rate, limits current impact, and improves output waveform conditions.
For demanding applications, the suitable solution depends on cable length, motor type, and EMC requirements.
Yes. By reducing high-frequency components generated by inverter switching, it can help decrease electromagnetic vibration and improve motor operating conditions.
Long cables increase distributed capacitance and may amplify high-frequency interference. Proper filtering helps reduce cable-related electrical stress and improves system stability.
Yes. Dufew provides customized solutions including voltage rating, current capacity, filtering characteristics, dimensions, and installation structure according to customer requirements.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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