The housing, front and back cover are made of cast-iron,with high hardne, strong bearing capacity, firm structure and uneasy to deform. YL series has large starting torque and running torque with stable running performance. Overheat protector is optional, which can prolong the working life and increase safety of motor. It has been widely used as the power source for grain mill, air compressor, washing machine, water pump and other equipments.