4 kW 220V to 380V Motor Drive Inverter

Detailed Product Review

A primary engineering challenge in industrial automation systems is the efficient and safe operation of high-power three-phase 380V AC industrial motors in locations where only single-phase 220V AC mains infrastructure is available. Traditional frequency converters (VFDs) typically only provide frequency control by reflecting the input voltage to the output. This leads to significant performance losses, such as insufficient torque, excessive current draw, and overheating of motor windings, when 380V motors are powered by 220V. The Mermak CNC Technology Market’s specialized 4 kW 220V to 380V Voltage Boosting Motor Drive Inverter is designed to fill this critical gap, featuring integrated “Step-Up Voltage Regulation” technology. This technology first rectifies the single-phase 220V AC input voltage from the mains to create a DC bus. It then boosts this DC voltage to a higher DC level (typically around 540V DC) sufficient to synthesize a three-phase 380V AC output voltage via a high-frequency boost converter circuit. This elevated DC voltage is then converted into a stable three-phase 380V AC output, closely resembling a sine wave, using an advanced IGBT-based inverter bridge with Pulse Width Modulation (PWM). This allows 4 kW (5.5 HP) industrial motors to be supplied with their nominal voltage of 380V, achieving 100% nominal torque and power performance. This optimizes the motor’s magnetic flux, enhances energy efficiency, and extends its operational lifespan.

The material construction of this inverter is designed to withstand demanding industrial conditions. A robust metal enclosure is optimized to meet Electromagnetic Compatibility (EMC) requirements and protect internal components from external factors. Internally, it features the latest generation of IGBT modules with high switching speeds and low conduction losses, high-performance digital signal processors (DSPs) for precise control algorithms, and an efficient dual-fan active cooling system. Proper electrical installation is critical for system integration. As the device can draw a high input current of approximately 35-40 Amps at full load, the mains connection must be made with at least 6mm² cross-section pure copper cable, and the main line must be protected by at least a 40A (Type C) circuit breaker. The motor connection should be made according to the 380V operating mode specified on the motor’s nameplate (typically Star connection), corresponding to the inverter’s 3-phase 380V output. This inverter is designed for applications requiring high-power three-phase motors, such as marble and stone cutting workshops, large air compressors, hydraulic power units, deep well pumps in rural areas, and agricultural machinery, where industrial electricity infrastructure is limited. It ensures full performance and uninterrupted operation by being powered from a single-phase mains supply. This technical capability allows businesses to efficiently utilize their industrial equipment despite infrastructure limitations.

Nominal Motor Performance with True 3-Phase 380V Output: The primary technical advantage of this inverter is its conversion of single-phase 220V AC input voltage to a stable and true three-phase 380V AC output voltage via its internal “Step-Up Voltage Regulation” technology. Industrial motors are designed to operate at their nominal voltage. Supplying a 380V motor with a lower voltage like 220V prevents it from reaching magnetic saturation, thus preventing it from producing its nominal torque and causing it to draw disproportionately high current to achieve the same power output. This leads to overheating of the motor windings, reduced insulation life, and overall efficiency loss. The Mermak inverter provides the motor’s design voltage of 380V, optimizing the motor’s magnetic flux, enabling it to produce its nominal torque at full capacity, and improving its power factor. Consequently, the motor operates within its design parameters at maximum mechanical power and efficiency.

Advanced Motor Protection and Lifespan Extension Mechanisms: This motor drive inverter not only provides voltage conversion but also significantly extends the motor’s operational lifespan through integrated protection algorithms and precise control mechanisms. Thanks to true Vector Control (Field Oriented Control – FOC) technology, the motor’s speed and torque are precisely managed independently of load fluctuations. This ensures stable motor operation even during sudden load changes, minimizing mechanical stress. Internal protection circuits guard against electrical faults such as overcurrent, overvoltage, undervoltage, overtemperature, and phase loss, preventing damage to the motor windings and insulation. Specifically, operating the motor at its nominal voltage prevents overheating of the windings.

Reliable Operation in Diverse International Markets: Mermak CNC is a trusted supplier with 16 years of experience, serving industrial automation needs globally. Our products are manufactured in the Ankara Uzay Sanayi factory and warehouse, ensuring up-to-date stock quantities and prices on our website. Stocked items are dispatched directly from our warehouse, eliminating production waiting times. We ensure careful packaging, meticulous invoice and document follow-up, and collaborate with reliable logistics partners. The Mermak team closely monitors the shipment process. We are proud to supply high-quality automation components to clients in the United Kingdom, United States, Canada, Australia, Ireland, and New Zealand, as well as South Africa and similar countries and international markets. Upon request, we can arrange product videos or factory viewings via WhatsApp or other contact channels.