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Rotation angle detection device

A technology of rotation angle detection and rotation angle detection, applied in measuring devices, using electric/magnetic devices to transfer sensing components, converting sensor outputs, etc., can solve problems such as inability to correct magnetic pole amplitude and phase correction

Inactive Publication Date: 2015-11-25
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the magnetic poles sensed by the magnetic sensors 121 and 122 cannot be specified immediately after starting the brushless motor, amplitude correction and phase correction based on the magnetic poles sensed by the magnetic sensors 121 and 122 cannot be performed.

Method used

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Embodiment Construction

[0036] Hereinafter, an embodiment in which the present invention is applied to a rotation angle detection device for detecting the rotation angle of a rotor of a brushless motor will be described in detail with reference to the drawings.

[0037] figure 1 It is a schematic diagram showing a configuration in which the rotation angle detection device according to the first embodiment of the present invention is applied to a rotation angle detection device for detecting the rotation angle of a rotor of a brushless motor.

[0038] This rotation angle detection device has a detection rotor (hereinafter, simply referred to as “rotor 1 ”) that rotates according to the rotation of the brushless motor 10 . Such as figure 2 As shown, the rotor 1 includes a cylindrical magnet 2 having a plurality of magnetic pole pairs corresponding to the magnetic pole pairs provided on the rotor of the brushless motor 10 . In other words, the rotor 1 is provided with a plurality of magnetic poles a...

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Abstract

Upon detecting a peak value from output signals (V1, V2) of one of either a first or a second magnetic sensor (21, 22), an rotation angle computation device (20) identifies, on basis of an amplitude compensation table corresponding to the one magnetic sensor for which the peak value was detected, a pole number of a magnetic pole sensed by the magnetic sensor. Then, based on the identified pole number and a magnetic pole identification table, a pole number of a magnetic pole sensed by the other magnetic sensor is identified. The pole numbers of the magnetic poles sensed by the respective magnetic sensors (21, 22) are thus identified, and the rotation angle computation device (20) compensates the output signals (V1, V2) of the respective magnetic sensors (21, 22) using amplitude compensation gains (G1, G2) corresponding to the sensedmagnetic poles (magnetic pole pair).

Description

technical field [0001] The present invention relates to a rotation angle detection device for detecting the rotation angle of a rotating body such as a rotor of a brushless motor. Background technique [0002] In order to control a brushless motor used in an electric power steering system or the like, it is necessary to supply current to the stator coil in accordance with the rotation angle of the rotor. Therefore, there is known a rotation angle detection device that detects the rotation angle of the rotor of the brushless motor using a detection rotor that rotates according to the rotation of the brushless motor. Specifically, as Figure 10 As shown, the detection rotor 101 (hereinafter referred to as “rotor 101 ”) includes a cylindrical magnet 102 having a plurality of magnetic pole pairs corresponding to the magnetic pole pairs provided on the rotor of the brushless motor. Around the rotor 101 , two magnetic sensors 121 and 122 are arranged at predetermined angular inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/244H02P6/06H02P6/08H02P6/16
CPCG01D5/2451
Inventor 上田武史小松逸人千德稔
Owner JTEKT CORP