Rotation angle detection device and rotation angle correction method
A technology of rotation angle detection and rotation angle, which is applied in the direction of measuring devices, electric devices, electric steering mechanisms, etc., can solve the problems of reduced accuracy of rotation angle detection, difficulty with belts, and unsuitability for absolute rotation angle detection, etc., to achieve improved rotation The effect of angle detection accuracy and high resolution
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Embodiment approach 1
[0127] Hereinafter, Embodiment 1 of the present invention will be described using FIGS. 1 to 7 .
[0128] 1 is a diagram showing a basic configuration of an absolute rotation angle detection device according to Embodiment 1 of the present invention, FIG. 2 is a diagram showing a rotation angle detection signal of a first magnetic detection element, and FIG. 3 is a diagram showing a rotation angle detection signal of a second magnetic detection element. Signal diagram, Figure 4 is a circuit block diagram of the absolute rotation angle detection device. Fig. 5 is a diagram showing the ideal value and actual value of the absolute rotation angle of the first and second rotating bodies, Fig. 6 is a diagram showing the rotation angle calculation output signal and the absolute rotation angle in the CPU, and Fig. 7 shows the first and second rotating bodies 2 The output signal diagram of the magnetic detection element.
[0129] In FIG. 1 , a first rotating body 101 is a rotating body...
Embodiment approach 2
[0148]Embodiment 2 will be described using FIGS. 8A to 14 . 8A, FIG. 8B and FIG. 8C are basic configuration diagrams of a rotation angle detection device according to Embodiment 2, FIG. 9 is a circuit block diagram of the rotation angle detection device, and FIGS. 10A and 10B are diagrams showing output signals of the first detection unit, 11A and FIG. 11B are diagrams showing the output signal of the third detection unit, and FIG. 12A and FIG. 12B are diagrams showing the output signal of the fourth detection unit. FIG. Figure 14 is an explanatory diagram for explaining a method for preventing occurrence of rotation angle detection errors.
[0149] In FIGS. 8A to 8B , the input shaft 204 is fitted with the first rotating body 203 capable of rotating multiple times. The outer peripheral surface of the first target 205 held by the first rotating body 203 has magnetic poles whose polarities are alternately magnetized at equal intervals. The second rotating body 210 has a gear ...
Embodiment approach 3
[0183] Next, Embodiment 3 of the present invention will be described using FIGS. 15 to 23 . In particular, Embodiment 3 relates to a high-precision rotation angle detection device for correcting a mechanical error of a gear or an electronic error of a rotation angle detection unit, and a method for correcting the rotation angle.
[0184] 15 is a configuration diagram of a rotation angle detection device according to Embodiment 3 of the present invention. A multi-pole magnetic ring 302 serving as a target is connected to the detected shaft 301 , and a first rotation angle detection unit 303 is arranged at a position facing the multi-pole magnetic ring 302 . A worm wheel 304 is connected to the detected shaft 301 , and a gear 305 meshes with the worm wheel 304 . A magnet 306 is arranged at the center of the gear 305 , and a second rotation angle detection unit 307 for detecting a rotation angle is arranged at a position facing the magnet 306 . The motor 309 is installed on the...
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