CURRENT DETECTOR AND MOTOR CONTROLLER PROVIDED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide a motor controller which is capable of improving a motor is performance by obtaining current detection characteristics optimal for motor drive conditions by a single current detector. SOLUTION: A flux density inside a core 11 is proportional to the product of the number of turns of a winding 12 and a current flowing through the winding 12, so that a flux density difference inside the core 11 between a large current and a small current that flow through the winding 12 can be lessened by switching a tap output (number of turns) from one to another. The number of turns of a winding may be determined so as to induce a magnetic flux as close in intensity to the saturation magnetic flux of the core 11 as possible, and a Hall element is capable of outputting a higher voltage and less affected by an offset.