4-in-1 All-in-One Permanent Magnet Variable Speed Single Screw Air Compressor Ctg Series 7.5~22kw

4-in-1 All-in-One Permanent Magnet Variable Speed Single Screw Air Compressor Ctg Series 7.5~22kw. High Efficiency Permanent Magnet Motor: Improves efficiency by 5-12% and reaches national level 1 energy efficiency standards. Low Noise Operation: Reasonable magnetic field design and rear exhaust design reduce operating noise significantly. Constant Air Pressure Control: Open loop vector control with response time under 50ms ensures stable pressure. Compact and Lightweight Design: Eliminates excitation system for simple structure, small size, and easy maintenance. High Starting Torque: Starting torque is over 3 times the rated torque, one level higher than asynchronous motors. Reliable Intake Valve System: Unique design prevents oil injection during emergency shutdowns or power outages. Durable Stainless Steel Pipes: Oil and gas pipes made of stainless steel or imported hoses for durability and no aging.