LMVFB Variable Frequency Drives (VFDs)
LMVFB Variable Frequency Drives (VFDs)
This high-performance IGBT-based variable frequency converter (VFD) adopts advanced Pulse Width Modulation (PWM) control and digital signal processor (DSP) core, delivering precise AC motor speed regulation, high energy efficiency, stable pure sine-wave output, and robust protection for industrial motor drive systems. It converts fixed-frequency grid AC power into adjustable-frequency/voltage AC power, enabling stepless speed control, torque optimization, and significant energy savings for fans, pumps, compressors, conveyors, machine tools, and other industrial loads.
This high-performance IGBT-based variable frequency converter (VFD) adopts advanced Pulse Width Modulation (PWM) control and digital signal processor (DSP) core, delivering precise AC motor speed regulation, high energy efficiency, stable pure sine-wave output, and robust protection for industrial motor drive systems. It converts fixed-frequency grid AC power into adjustable-frequency/voltage AC power, enabling stepless speed control, torque optimization, and significant energy savings for fans, pumps, compressors, conveyors, machine tools, and other industrial loads.
Core Features
- Advanced IGBT Power Stage: High-speed, low-loss IGBT modules with optimized switching topology, low harmonic distortion, high power density, and long service life.
- Multiple Control Modes: Support V/F (Volts/Frequency) control, open-loop vector control (SVC), closed-loop vector control; high starting torque (150%–180% at 0.5Hz), fast torque response (<40ms), wide speed ratio up to 1:200.
- High Efficiency & Low THD: Full-load efficiency ≥97%; output voltage THD <3% (linear load), <5% (non-linear load); input power factor >0.95, reducing grid harmonic pollution.
- Wide Operating Range: Input voltage 3-phase 380V±20% (220V single-phase optional), frequency 45–65Hz; output frequency 0.01–600Hz (V/F up to 1200Hz), frequency resolution 0.01Hz.
- Comprehensive Protection: Overvoltage, undervoltage, overcurrent, short-circuit, overload, over-temperature, phase loss, ground fault, stall, and DC bus overvoltage protection; automatic fault alarm and restart.
- Flexible Communication & Control: Built-in RS485 (Modbus RTU), optional Ethernet/Profinet/Modbus TCP/IP; support digital/analog input/output, keypad control, remote PLC control, and multi-unit linkage.
- Reliable & Easy Maintenance: Forced air cooling, IP20/IP30 protection, wide ambient temperature (-10°C to +40°C), anti-vibration design, no rotating parts, low maintenance cost.
Technical Specifications
| Parameter | Details |
|---|---|
| Rated Power | 0.75kW – 630kW (0.75/1.5/2.2/3.7/5.5/7.5/11/15/18.5/22/30/37/45/55/75/90/110/132/160/200/250/315/400/500/630kW) |
| Input | 3-phase 380VAC ±20%, 45–65Hz; single-phase 220VAC ±15% (≤15kW optional) |
| Output | 3-phase 0–380VAC (0–rated voltage), 0.01–600Hz; pure sine wave |
| Control Method | V/F control, open-loop vector (SVC), closed-loop vector |
| Starting Torque | 150% @ 0.5Hz (V/F); 180% @ 0.5Hz (vector) |
| Speed Regulation Ratio | 1:100 (V/F); 1:200 (vector) |
| Frequency Accuracy | Digital setting: ±0.01%; analog setting: ±0.1% of max frequency |
| Carrier Frequency | 1–15kHz (auto-adjustable by load) |
| Overload Capacity | 120% for 1min, 150% for 30s, 200% for 2s (current limit) |
| Efficiency | ≥96% (≥15kW), ≥97% (≥55kW) |
| Protection Class | IP20 (standard), IP30/IP54 (optional) |
| Cooling | Forced air cooling |
| Ambient | -10°C ~ +40°C (no derating), altitude ≤1000m |
| Communication | RS485 (Modbus RTU); optional Profinet, Ethernet, CANopen |
| Certifications | CE, ISO9001, RoHS |
Working Principle
- Rectification: Input AC power is converted to stable DC via a three-phase IGBT rectifier with PFC (Power Factor Correction) to improve power factor and reduce harmonics.
- DC Bus: Smoothing capacitors filter the DC bus voltage, providing stable DC for the inverter stage.
- Inversion: The IGBT inverter bridge, controlled by DSP-based PWM, inverts DC into three-phase AC with adjustable frequency and voltage, driving the motor at the desired speed.
Typical Applications
- Fan & pump systems (HVAC, water supply, cooling) – up to 30–50% energy saving
- Conveyors, mixers, extruders, and textile machinery
- Machine tools, compressors, centrifuges, and hoists
- Marine, mining, metallurgy, and chemical industrial drives
- Renewable energy power conversion & UPS systems
Installation & Operation Notes
- Install in a well-ventilated, dust-free, non-corrosive environment; avoid direct sunlight and vibration.
- Follow correct wiring for input/output, motor, and control terminals; ensure proper grounding.
- Set parameters matching motor nameplate (rated voltage, current, frequency, power) for optimal performance.
- Regularly clean heat sinks and filters; check fan operation and terminal connections.
OEM & ODM Services
We are a manufacturer with over 15 years of experience. We offer:
-
Private Labeling: Custom logo printing on the casing and packaging.
-
Firmware Customization: Tailored parameters for specific OEM applications.
-
Bulk Shipping: Efficient logistics solutions via sea, air, or express (DHL/UPS/FedEx).
Frequently Asked Questions (FAQ)
Q1: Are you a manufacturer or a trading company?
A: We are a direct manufacturer based in [Your City/Country]. This ensures you get the best factory pricing and direct technical support.
Q2: Can the VFD be used for single-phase input to three-phase output?
A: Yes, we have specific models designed to convert single-phase 220V input to three-phase 220V output, perfect for residential or light commercial applications.
Q3: What is the warranty period?
A: We offer a standard 18 to 24-month warranty for all VFD products, with lifetime technical support.
Q4: Do you provide technical support for programming?
A: Absolutely. We provide free technical support via email, video call, and phone. We also provide user manuals and parameter setting guides in English.
Core Features
- Advanced IGBT Power Stage: High-speed, low-loss IGBT modules with optimized switching topology, low harmonic distortion, high power density, and long service life.
- Multiple Control Modes: Support V/F (Volts/Frequency) control, open-loop vector control (SVC), closed-loop vector control; high starting torque (150%–180% at 0.5Hz), fast torque response (<40ms), wide speed ratio up to 1:200.
- High Efficiency & Low THD: Full-load efficiency ≥97%; output voltage THD <3% (linear load), <5% (non-linear load); input power factor >0.95, reducing grid harmonic pollution.
- Wide Operating Range: Input voltage 3-phase 380V±20% (220V single-phase optional), frequency 45–65Hz; output frequency 0.01–600Hz (V/F up to 1200Hz), frequency resolution 0.01Hz.
- Comprehensive Protection: Overvoltage, undervoltage, overcurrent, short-circuit, overload, over-temperature, phase loss, ground fault, stall, and DC bus overvoltage protection; automatic fault alarm and restart.
- Flexible Communication & Control: Built-in RS485 (Modbus RTU), optional Ethernet/Profinet/Modbus TCP/IP; support digital/analog input/output, keypad control, remote PLC control, and multi-unit linkage.
- Reliable & Easy Maintenance: Forced air cooling, IP20/IP30 protection, wide ambient temperature (-10°C to +40°C), anti-vibration design, no rotating parts, low maintenance cost.
Technical Specifications
| Parameter | Details |
|---|---|
| Rated Power | 0.75kW – 630kW (0.75/1.5/2.2/3.7/5.5/7.5/11/15/18.5/22/30/37/45/55/75/90/110/132/160/200/250/315/400/500/630kW) |
| Input | 3-phase 380VAC ±20%, 45–65Hz; single-phase 220VAC ±15% (≤15kW optional) |
| Output | 3-phase 0–380VAC (0–rated voltage), 0.01–600Hz; pure sine wave |
| Control Method | V/F control, open-loop vector (SVC), closed-loop vector |
| Starting Torque | 150% @ 0.5Hz (V/F); 180% @ 0.5Hz (vector) |
| Speed Regulation Ratio | 1:100 (V/F); 1:200 (vector) |
| Frequency Accuracy | Digital setting: ±0.01%; analog setting: ±0.1% of max frequency |
| Carrier Frequency | 1–15kHz (auto-adjustable by load) |
| Overload Capacity | 120% for 1min, 150% for 30s, 200% for 2s (current limit) |
| Efficiency | ≥96% (≥15kW), ≥97% (≥55kW) |
| Protection Class | IP20 (standard), IP30/IP54 (optional) |
| Cooling | Forced air cooling |
| Ambient | -10°C ~ +40°C (no derating), altitude ≤1000m |
| Communication | RS485 (Modbus RTU); optional Profinet, Ethernet, CANopen |
| Certifications | CE, ISO9001, RoHS |
Working Principle
- Rectification: Input AC power is converted to stable DC via a three-phase IGBT rectifier with PFC (Power Factor Correction) to improve power factor and reduce harmonics.
- DC Bus: Smoothing capacitors filter the DC bus voltage, providing stable DC for the inverter stage.
- Inversion: The IGBT inverter bridge, controlled by DSP-based PWM, inverts DC into three-phase AC with adjustable frequency and voltage, driving the motor at the desired speed.
Typical Applications
- Fan & pump systems (HVAC, water supply, cooling) – up to 30–50% energy saving
- Conveyors, mixers, extruders, and textile machinery
- Machine tools, compressors, centrifuges, and hoists
- Marine, mining, metallurgy, and chemical industrial drives
- Renewable energy power conversion & UPS systems
Installation & Operation Notes
- Install in a well-ventilated, dust-free, non-corrosive environment; avoid direct sunlight and vibration.
- Follow correct wiring for input/output, motor, and control terminals; ensure proper grounding.
- Set parameters matching motor nameplate (rated voltage, current, frequency, power) for optimal performance.
- Regularly clean heat sinks and filters; check fan operation and terminal connections.
OEM & ODM Services
We are a manufacturer with over 15 years of experience. We offer:
-
Private Labeling: Custom logo printing on the casing and packaging.
-
Firmware Customization: Tailored parameters for specific OEM applications.
-
Bulk Shipping: Efficient logistics solutions via sea, air, or express (DHL/UPS/FedEx).
Frequently Asked Questions (FAQ)
Q1: Are you a manufacturer or a trading company?
A: We are a direct manufacturer based in [Your City/Country]. This ensures you get the best factory pricing and direct technical support.
Q2: Can the VFD be used for single-phase input to three-phase output?
A: Yes, we have specific models designed to convert single-phase 220V input to three-phase 220V output, perfect for residential or light commercial applications.
Q3: What is the warranty period?
A: We offer a standard 18 to 24-month warranty for all VFD products, with lifetime technical support.
Q4: Do you provide technical support for programming?
A: Absolutely. We provide free technical support via email, video call, and phone. We also provide user manuals and parameter setting guides in English.
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