Brushless DC motor with the characteristic of electronic commutation, overcomes the disadvantages of Brushless DC motor with mechanical wear, complicated structure, difficult maintenance, etc. Brushless DC motor widely applied to the high speed performance of CNC machine tools, robots, household appliances, office automation equipments and other fields.The traditional brushless DC motor using Holzer mechanical sensor is used to obtain the rotor position,large volume and high cost,which has some limitations....