| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation angle detection device which positions a plurality of magnetic detection elements for forming a magnetic detection sensor with high precision, removes temperature differences among the plurality of magnetic detection elements forming the magnetic detection sensor, and facilitates wiring to the magnetic detection sensor, in a structure in which the magnetic detection sensor is set at a radial position approximately equal to or more outside than that of a magnetic-field generating means. SOLUTION: A permanent magnet 20 rotates with a rotating shaft 12, and four inside yokes 30 are set annularly on the peripheral side of the permanent magnet 20. Gaps 32 are formed between the inside yokes adjoining circumferentially. An outside yoke 40 is set on the peripheral side of the four inside yokes 30. The magnetic detection sensor 50 is composed of two Hall devices set at one spot, and is set in the gap 32. Magnetic paths 200, 202 which the inside yokes 30 and the outside yoke 40 form cross at an angle of approximately 90°at the magnetic sensor 50. COPYRIGHT: (C)2007,JPO&INPIT
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