UCS UD-VPM series of low-power permanent magnet variable speed screw air compressors. Speed range: 40%-100% Power range: 5.5-55kW Pressure range: 0.7-1.0MPa European CE Certified UCS UD-(A)VPM single-stage variable speed screw air compressor adopts VFD technology and allows 40%-100% regulation range, which ensures suitable and stable torque with slight temperature rise in a wide range of speeds. Vector Frequency control technology separately controls excitation and torque of the two vectors of stator current and then composes and converts them into parameters control signals of frequency converter to achieve adequate control of electromagnetic torque. In this way, the motor can keep running at low temperatures, even at low speeds. This efficient frequency conversion technology can suppress the inevitable noise and harmful harmonics in the standard frequency converters. The new generation of appropriative vector frequency conversion control is used to convert DC to AC, which improves the resistance to high temperature, has higher conversion efficiency, saves energy consumption and improves reliability.