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Leading Manufacturer of Variable Frequency Drives in China

OULU provides innovative VFD drives and AC motor control solutions designed for pumps, compressors, HVAC systems, and automation equipment. Improve energy efficiency and reliability with our advanced frequency inverter technology.

VFD Drive Unit
VFD Fault Analysis Diagram

About OULU – Professional VFD Manufacturer

Founded in 2007, OULU specializes in the design, development, and manufacturing of Variable Frequency Drives (VFD Drives) for a wide range of industrial applications. Our VFDs are engineered to provide reliable motor control, improved energy efficiency, and seamless performance under demanding environments.

With over 20 years of combined experience in power electronics and motor control, we have become a trusted VFD manufacturer serving global markets including HVAC, water treatment, and industrial automation industries.

20+ Years Experience

In VFD manufacturing and R&D

Global Certifications

CE, ISO9001, SGS Certified

OEM & ODM Support

Custom solutions for your needs

Fast Global Delivery

Efficient logistics & support

Explore Our VFD Drives Series

As a trusted manufacturer of VFD drives, OULU offers a wide range of variable frequency drives for different industries, from basic V/F control to advanced vector control applications.

EV200 Series

EV200 Series

Compact and economical variable frequency drives for light-duty applications with standard V/F control.

  • • Power Range: 0.4kW – 15kW
  • • Control Mode: V/F Control
  • • Applications: Pumps, Fans, Conveyors
  • • Protection: Overcurrent, Overvoltage, Overheat
Learn More
EV210 Series

EV210 Series

Upgraded VFD with higher stability, optimized performance, and power range up to 15kW.

  • • Power Range: 0.4kW – 15kW
  • • Control Mode: Enhanced V/F & Sensorless Vector
  • • Features: Built-in PID, RS485 Modbus
  • • Applications: HVAC, Compressors, Mixers
Learn More
EV510A Series

EV510A Series

High-performance vector control VFD for precise torque control, high-speed response, and complex automation systems.

  • • Power Range: 0.75kW – 600kW
  • • Control Mode: Open/Closed Loop Vector
  • • Features: Torque Control, Encoder Feedback
  • • Applications: Cranes, Extruders, CNC Machines
Learn More
VFD Braking Resistor

Braking Resistor Units

High-dissipation braking resistors for regenerative energy management in deceleration and overhauling loads.

  • • Power: 500W – 10kW
  • • Resistance: 10Ω – 1000Ω
  • • Cooling: Natural or Forced Air
  • • Compatible with EV200/EV210/EV510A
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VFD Control Panel

VFD Control Panels

Custom-engineered control panels integrating VFDs, breakers, contactors, and HMI for turnkey solutions.

  • • IP55/NEMA 12 Enclosures
  • • UL, CE Compliant
  • • Multi-Motor Control
  • • Remote Monitoring Ready
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VFD Accessories

VFD Accessories

Complete range of input/output reactors, filters, and surge protectors for optimal VFD performance.

  • • AC/DC Reactors
  • • RFI/EMI Filters
  • • Surge Suppressors
  • • Communication Modules
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Ball Mill VFD

Heavy-Duty VFDs for Ball Mills

Robust VFD solutions for grinding and milling applications requiring high starting torque and overload capacity.

  • • High Torque at Low Speed
  • • 150% Overload for 60s
  • • Dust & Vibration Resistant
  • • Vector Control for Precision
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Crusher VFD

VFDs for Rock Crushers

Durable frequency inverters designed for crushing and screening plants with frequent load changes.

  • • Impact Load Handling
  • • Fast Torque Response
  • • Anti-Stall Function
  • • Remote Start/Stop & Monitoring
Learn More

Industrial Applications of Variable Frequency Drives

OULU VFDs are widely used in energy-saving and motion control solutions across multiple industries.

P

Water Pumps

Variable frequency drives for booster, irrigation, and wastewater pumps. Achieve precise pressure control and reduce energy consumption by up to 50%.

H

HVAC Systems

VFD drives for chillers, blowers, and air handling systems. Improve indoor air quality and reduce HVAC energy costs significantly.

C

Compressors

Optimize energy use and torque control for air compressors. Eliminate pressure fluctuations and extend equipment life.

F

Fans & Blowers

Smooth speed regulation with VFD fan control systems. Reduce mechanical stress and noise in ventilation systems.

M

Conveyors & Mixers

VFD drives for adjustable speed and overload protection. Enable soft start/stop and precise process control.

E

Extruders & Rollers

High-torque vector control VFDs for plastic and metal processing. Maintain constant tension and speed accuracy.

VFD Motor Failure Analysis

Why Choose OULU Variable Frequency Drives?

As a professional VFD manufacturer, OULU ensures stable performance, global quality standards, and efficient customization to fit your exact industrial requirements.

  • Energy-Saving Design

    Reduce energy consumption by up to 60% with intelligent motor control algorithms.

  • Global Technical Support

    24/7 engineering support via email, WhatsApp, and remote diagnostics.

  • OEM & ODM Services

    Custom branding, firmware, and hardware modifications for your specific application.

  • Fast Delivery & Logistics

    Stock availability and express shipping options to North America, Europe, and Asia.

20+
Years of Experience
50+
Countries Served
100K+
Units Installed
99.8%
Customer Satisfaction

Frequently Asked Questions

What is a Variable Frequency Drive (VFD)?

A VFD is an electronic device that controls the speed and torque of an AC motor by varying the frequency and voltage of the power supplied to the motor. It enables energy savings, soft starting, and precise process control.

Can I use a VFD with any motor?

Most standard 3-phase induction motors are compatible with VFDs. However, for long cable runs or high-frequency operation, it's recommended to use inverter-duty motors to prevent insulation damage.

How do I select the right VFD for my application?

Consider motor power (kW/HP), voltage, control type (V/F or vector), overload requirements, and environmental conditions. Our engineers can assist with proper sizing and selection.

Do you offer technical support after purchase?

Yes, OULU provides comprehensive technical support including installation guidance, parameter setting, troubleshooting, and firmware updates via email, phone, and remote access.

What certifications do your VFDs have?

Our VFDs are CE, ISO9001, and SGS certified, ensuring compliance with international safety and quality standards.

Contact Our VFD Drives Experts

We’re here to help you find the right Variable Frequency Drive for your application. Whether you need product specifications, OEM customization, or technical support, our team is ready to assist.

Looking for a quote on EV200, EV210, or EV510A series? Provide your motor power rating, voltage, and application details, and our VFD experts will recommend the best inverter solution.

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