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US 2003/0227271 A1Published application
Brushless motor control method
AssigneeMitsuba Corporation
InventorYoichi Shindo
Life of this patent
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AssigneeMitsuba Corporation
InventorYoichi Shindo
Estimating the term…
Energization stages are formed by means of the first and second sensor groups and a torque constant is defined for each of the stages. A target current value is computationally determined so as to drive the motor under control. As a torque command showing a target torque of the motor 1 is input to the controller 11, the target current value is computationally determined for each stage according to a torque constant map, which provides a table of torque constants for different phases and different stages. The rotor angle of the motor 1 is detected by Hall sensors 10 and the current stage is computationally determined on the basis of the detected rotor angle. Then, a target current value is defined as a function of the target torque for each stage on the basis of the current stage and the motor 1 is driven by the driver under PID control based on the target current value.
A method of controlling a brushless motor comprising a stator having a multiphase armature coil, a rotor having a permanent magnet and arranged rotatably at the outside or inside of said stator, a first sensor group of a plurality of magnetic detection elements and a second sensor group having at least a magnetic detection element separated from said magnetic detection elements of said first sensor group by a predetermined gap, the method comprising:
Dependencies are inferred from the claim text.