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When the compressor is turned on, the motor's starting current can be 5 to 6 times higher than its rated current. This surge not only shortens the motor's lifespan but also increases energy consumption. To address this, system designers usually select motors with a certain safety margin during the design phase. However, the motor speed is typically fixed, and in real-world applications, there are often situations where it needs to operate at lower or higher speeds. This makes frequency conversion an essential solution. A variable frequency drive (VFD) allows for a soft start of the motor, which reduces mechanical stress and electrical load. By adjusting the input voltage frequency, the VFD helps save energy and enables precise speed control. In addition, it offers important protection features such as overcurrent, overvoltage, and overload protection. Leading domestic manufacturers like Sanjing and Yingweiteng have developed high-quality inverters that are widely used in industrial and commercial applications. These devices not only improve efficiency but also enhance the reliability and longevity of the equipment they control. Whether in HVAC systems, pumps, or fans, using a VFD is a smart choice for optimizing performance and reducing operational costs.