Rotation angle detector
First Claim
1. An apparatus for detecting an absolute rotation angle of a detection body, the apparatus comprising:
- a first rotation angle detector connected to said detection body for generating a first detection signal having a cycle corresponding to the rotation of said detection body, wherein said first rotation angle detector includes a first rotating body that is connected to said detection body and rotates together with said detection body;
a second rotation angle detector connected to said first rotation angle detector;
said second rotation angle detector including a second rotating body that rotates together with said first rotating body and generating a second detection signal having a cycle corresponding to the rotation of said second rotating body in accordance with the rotation of said second rotating body, wherein the rotation rate of said second rotating body is greater than that of said first rotating body;
a control device connected to said first rotation angle detector and said second rotation angle detector for detecting an absolute rotation angle of said detection body in accordance with said first detection signal and said second detection signal, wherein;
said absolute rotation angle is determined based on the combination of a value of said first detection signal and a value of said second detection signal; and
when there is an absolute rotation angle having the same combination of the value of said first detection signal and the value of said second detection signal, said control device specifies an absolute rotation angle based on the relationship between the change of the value of said first detection signal and the change of the value of said second detection signal.
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Accused Products
Abstract
A rotation angle detector that is able to detect an absolute rotation angle of a detection body accurately and is able to reduce the installation space required. The rotation angle detector includes a first rotation angle detector connected to the detection body for generating a first detection signal having a cycle corresponding to the rotation of the detection body. The first rotation angle detector includes a first rotating body which is connected to the detection body and rotates together with the detection body. The detector includes a second rotation angle detector connected to the first rotation angle detector. The second rotation angle detector includes a second rotating body that rotates together with the first rotating body at a rate greater than that of the first rotating body, and generates a second detection signal having a cycle corresponding to the rotation of the second rotation body. The control device detects an absolute rotation angle of the detection body in accordance with the first detection signal and the second detection signal.
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Citations
21 Claims
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1. An apparatus for detecting an absolute rotation angle of a detection body, the apparatus comprising:
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a first rotation angle detector connected to said detection body for generating a first detection signal having a cycle corresponding to the rotation of said detection body, wherein said first rotation angle detector includes a first rotating body that is connected to said detection body and rotates together with said detection body;
a second rotation angle detector connected to said first rotation angle detector;
said second rotation angle detector including a second rotating body that rotates together with said first rotating body and generating a second detection signal having a cycle corresponding to the rotation of said second rotating body in accordance with the rotation of said second rotating body, wherein the rotation rate of said second rotating body is greater than that of said first rotating body;
a control device connected to said first rotation angle detector and said second rotation angle detector for detecting an absolute rotation angle of said detection body in accordance with said first detection signal and said second detection signal, wherein;
said absolute rotation angle is determined based on the combination of a value of said first detection signal and a value of said second detection signal; and
when there is an absolute rotation angle having the same combination of the value of said first detection signal and the value of said second detection signal, said control device specifies an absolute rotation angle based on the relationship between the change of the value of said first detection signal and the change of the value of said second detection signal. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for detecting an absolute rotaiton angle of a detection body, the apparatus comprising:
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a rotating plate being connected to said detection body and rotating together with said detection body;
said rotating plate including a plurality of detection holes provided for the periphery of said detection body and defining non-hole detection parts between adjacent detection holes thereof;
each of said detection holes having at least one first detection segment and each of said non-hole detection parts having at least one second detection segment;
a plurality of detection devices detecting said first and second detection segments based on the rotation of said rotating plate and generating a plurality of binary signals; and
a control device connected to said plurality of detection devices and generating a data code corresponding to an absolute rotation angle of said detection body in accordance with each of said binary signals, wherein said control device changes the data code based on at least one signal conversion in said plurality of binary signals due to the rotation of said detection body by a predetermined rotation angle, and determines said absolute rotation angle in accordance with said data code. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for detecting an absolute rotation angle of a detection body, comprising:
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a rotating plate being connected to said detection body and rotating together with said detection body;
said rotating plate including a plurality of first detection parts provided for the periphery of said detection body and defining a plurality of second second detection parts between adjacent said first detection parts thereof;
each of said first detection parts having at least one first detection segment and each of said second detection parts having at least one second detection segment, and a reference rotation angle being defined based on said first and second detection segments;
a plurality of detection devices detecting said first and second detection segments based on the rotation of said rotating plate and generating a plurality of binary signals, said plurality of detection devices including first detection devices and second detection devices;
said plurality of detection devices being arranged so that the condition in which one of said first detection parts and said second detection parts is detected is switched to the condition in which the other of said first detection parts and said second detection parts is detected for each rotation of said rotating plate by a first rotation angle, and said first rotation angle being set to a value obtained by dividing said reference rotation angle by a positive integer; and
a control device connected to said plurality of detection devices, generating code data corresponding to an absolute rotation angle of said detection body in accordance with said binary signals generated by any one of said first detection parts and said second detection parts for each rotation of said rotating plate by said first rotation angle, and storing said code data, wherein said control device stores second binary signals generated by said second detection devices as code data when first binary signals generated by said first detection devices are changed based on the rotation of said detection body by said first rotation angle and also stores the first binary signals when the second binary signals generated by said second detection devices are changed, and wherein said control device determines said absolute rotation angle in accordance with said code data stored during the rotation of said detection body by a second rotation angle that is set at a predetermined positive integer multiple of said first rotation angle. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification