DEVICE FOR CORRECTING HALL SENSOR INSTALLATION POSITION ERROR OF BLDC MOTOR HAVING LINEAR HALL SENSOR, AND METHOD THEREOF

摘要

There is provided a device for correcting a Hall sensor installation position error in a BLDC motor which includes a rotor with a permanent magnet, a stator wound with coils to form a magnetic field around the rotor, and three linear Hall sensors installed outwardly around the rotor to generate output signals by the Hall-Effect, the device comprising: a detection unit to detect output signals H₁, H₂, H₃ output from the three linear Hall sensors; a transformation unit to transform the output signals H₁, H₂, H₃ detected in the detection unit to orthogonal two-phase transformation signals H_a, H_b and to transform the transformation signals H_a, H_b to normalized transformation signals H_an, H_bn; an operation unit to calculate a rotation angle of the motor from the normalized transformation signals H_an, H_bn output in the transformation unit; and a control unit to control the current supplied to the coils winding the stator based on information of the rotation angle transmitted from the operation unit, wherein the transformation unit transforms the output signals H₁, H₂, H₃ to the orthogonal two-phase transformation signals H_a, H_b by Clarke Transformation.