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Rotation angle detection device

A technology of rotation angle detection and rotation angle, applied in measuring devices, using electric/magnetic devices to transfer sensing components, converting sensor outputs, etc., can solve problems such as rotation angle errors and installation errors

Inactive Publication Date: 2015-04-08
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, if the angular interval between the two magnetic sensors 11, 12 deviates from 90° due to mounting errors of the respective magnetic sensors 11, 12 toward the substrate 2, assembly errors of the substrate 2, etc., then, for example, Figure 15A As shown, the phase difference between the output signals of the two magnetic sensors 11, 12 is also completely deviated from 90°, so as Figure 15B As shown, the rotation angle of the rotor detected by the rotation angle detection device will produce an angle error

Method used

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Embodiment Construction

[0043] Hereinafter, an embodiment in which the present invention is applied to a rotation angle detection device for detecting a rotation angle of a rotor of a brushless motor will be described in detail with reference to the drawings.

[0044] figure 1 It is a schematic diagram showing the configuration of the rotation angle detection device according to the first embodiment of the present invention.

[0045] This rotation angle detection device can be used, for example, to detect the rotation angle of a rotor of a brushless motor of an electric power steering system. The rotation angle detection device includes, for example, a detection rotor 1 that rotates according to the rotation of the brushless motor. The rotor 1 includes a cylindrical magnet having a plurality of magnetic pole pairs. In this example, the magnet has a pair of pole pairs. That is, the magnet has two magnetic poles N, S arranged at equal intervals.

[0046] Around the rotor 1 , the first magnetic sen...

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Abstract

An output signal V1=sin ¸ is output from a first magnetic sensor 11 and an output signal V2=cos(¸+±) is output from a second magnetic sensor 12. An output signal correction unit 22 in a rotation angle computing device 20 corrects the output signal V2 from the second magnetic sensor 12 to an output signal V2' (=cos ¸) so that a positional phase difference (90°+±) between the magnetic sensors 11 and 12 is made equal to a target phase difference of 90°. A rotation angle computing unit 23 computes the rotation angle ¸ of a rotor 1 based on the corrected signal V2' (=cos ¸) and the other output signal V1 (=sin ¸).

Description

technical field [0001] The present invention relates to a rotation angle detecting device for detecting the rotation angle of a rotating body. Background technique [0002] A brushless motor used in an electric power steering device or the like is controlled by energizing a stator winding in accordance with a rotation angle of a rotor. Therefore, for example, it is known that there are Figure 13 The rotation angle detection device shown (for example, refer to Patent Document 1). The rotation angle detecting device has: a rotor 1 including a magnet having two magnetic poles; The angular interval configuration. The respective magnetic sensors 11 and 12 output sine wave signals having a phase difference of 90° between them, and detect the rotation angle of the rotor 1 based on these two sine wave signals. Two magnetic sensors 11, 12 are mounted on Figure 13 On the substrate 2 indicated by the dotted line. [0003] Will Figure 13 The direction indicated by the arrow in is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/244
CPCG01D5/2448
Inventor 上田武史冷水由信
Owner JTEKT CORP