Abstract: A method of correcting a signal delay of a Hall sensor for an air compressor motor when the air compressor motor rotates at a high speed includes: a first step of calculating an offset angle ? from a voltage equation, to which a q-axis voltage and a d-axis voltage are applied, by performing zero current control when an inertia braking section occurs during an operation of the motor; a second step of calculating a reference offset angle ?offset of the Hall sensor and a delay time t by using an angular velocity ? at any two points in the inertia braking section by using the equation for calculating the offset angle ?; and a third step of calculating a corrected q-axis voltage and a corrected d-axis voltage through the zero current control corrected and comparing the corrected q-axis voltage and the corrected d-axis voltage with a reference error.

Abstract: A method of correcting a signal delay of a Hall sensor for an air compressor motor when the air compressor motor rotates at a high speed includes: a first step of calculating an offset angle ? from a voltage equation, to which a q-axis voltage and a d-axis voltage are applied, by performing zero current control when an inertia braking section occurs during an operation of the motor; a second step of calculating a reference offset angle ?offset of the Hall sensor and a delay time t by using an angular velocity ? at any two points in the inertia braking section by using the equation for calculating the offset angle ?; and a third step of calculating a corrected q-axis voltage and a corrected d-axis voltage through the zero current control corrected and comparing the corrected q-axis voltage and the corrected d-axis voltage with a reference error.

Abstract: An endoscope, an endoscope system having an endoscope, and an endoscope control method are disclosed. The endoscope includes: a main body and a buoyancy control device. The main body may be configured in the form of a capsule and include an image capturing unit for capturing image information. The buoyancy control device may control buoyancy by changing the volume of the main body. Images of various types of internal organs can be precisely captured.

Abstract: An endoscope, an endoscope system having an endoscope, and an endoscope control method are disclosed. The endoscope includes: a main body and a buoyancy control device. The main body may be configured in the form of a capsule and include an image capturing unit for capturing image information. The buoyancy control device may control buoyancy by changing the volume of the main body. Images of various types of internal organs can be precisely captured.