Mainly used in screw type air compressor, piston type air compressor, etc., with a number of well-known domestic and foreign air compressor brand cooperation. It has a large starting torque, can operate normally when overloaded, and can adapt to a certain range of voltage fluctuations and frequent starting requirements. Sufficient heat resistance, the use of insulation materials above grade F, to avoid fully enclosed and rotary air compressor operating conditions, resulting in motor temperature rise, accelerate the aging of insulation materials, resulting in motor damage. It can withstand voltage fluctuations, vibration and shock resistance, optimize the design of electromagnetic schemes and electromagnetic coils, use the best winding materials, and have good mechanical strength. At the same time, when the voltage fluctuation range is ±10% ~ ±15%, ensure normal starting operation.