Y series three-phase asynchronous electric motor, as the latest series designed in China, is enclosed self-ventilation air-cooling cage A/C asynchronous electric motor. Its protective grade is IP44. The Y series electric motor has a lot of advantages including: high efficiency, large starting rotor torque, excellent performance, low nose, low vibration, high reliability, convenient operation and maintenance, and the mounting dimension that meets the IEC standard, and so on. The Y series electric motor is fit for the common sites that contain no inflammable, explosive or corrosive gas and machineries that has no special requirements including: metal cutting machine, water pump, fan, transportation machinery, puddle mixer, agricultural machinery, foodstuff machinery, etc. The model code of the Y series electric motor comprises four parts: the first part "Y "indicates asynchronous electric motor; the digits of the second part indicate the central height of the frame (which remains the same with footing as well as without); the English letter of the third part is the code of the frame length (S-short frame, M-medium frame, L-long frame), the digit after the letter is the code of the iron core length; and the digit after the hyphen is the fourth part which indicates the poles of the electric motor.