WO2006006605A1 - 磁気エンコーダ - Google Patents
磁気エンコーダ Download PDFInfo
- Publication number
- WO2006006605A1 WO2006006605A1 PCT/JP2005/012863 JP2005012863W WO2006006605A1 WO 2006006605 A1 WO2006006605 A1 WO 2006006605A1 JP 2005012863 W JP2005012863 W JP 2005012863W WO 2006006605 A1 WO2006006605 A1 WO 2006006605A1
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- WIPO (PCT)
- Prior art keywords
- magnetic
- poles
- track
- magnetic encoder
- pattern
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
- G01D5/2492—Pulse stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2451—Incremental encoders
Definitions
- the present invention relates to a magnetic encoder used to detect rotation of a rotating member provided in, for example, an automobile or a household electric appliance.
- a magnetic encoder is used, for example, for detecting a crank angle of an automobile.
- Figure 13 shows a conventional example of a magnetic encoder.
- the magnetic encoder includes a signal output unit 101 serving as a position reference.
- the signal output unit 101 is configured so that the circumferential width of the magnetic pole is twice the circumferential width of the magnetic pole in other portions.
- the circumferential width of the magnetic poles in the region other than the signal output unit 101 is all constant (half the circumferential width of the magnetic poles in the signal output unit 101). In this area! Then, the rotation angle with the signal output unit 101 as a reference (0 °) is detected.
- the magnetic encoder in order to detect a signal output unit serving as a position reference, the signal output unit needs to pass through a sensor detection unit. Therefore, the magnetic encoder may be rotated up to about 360 ° at the maximum for detection of this signal output part.
- the magnetic energy is about 360 ° at the maximum. It was necessary to rotate the encoder, and the rotation angle could not be specified with a small amount of rotation in a short time.
- Patent Documents 2 and 3 disclose a technique for specifying a rotation angle in a short time. However, in the case of this technique, further improvements with a complicated configuration and a large number of parts have been desired. .
- Patent Document 1 Japanese Patent Laid-Open No. 7-74020
- Patent Document 2 JP-A-9-49453
- Patent Document 3 Japanese Patent Laid-Open No. 11-229948
- An object of the present invention is to provide a magnetic encoder capable of specifying a rotation angle with a small number of rotations.
- the present invention employs the following means in order to solve the above problems.
- the magnetic encoder of the present invention includes:
- An annular magnetic encoder in which a plurality of magnetic poles, S poles and N poles, are arranged alternately.
- the rotation angle is specified by changing the width of the magnetic pole in the rotation direction according to the rotation angle. It is constituted and is characterized by being.
- the rotation angle can be specified by changing the width of the magnetic pole in the rotation direction, the rotation angle can be specified with little rotation.
- the magnetic encoder of the present invention includes:
- An annular magnetic encoder in which a plurality of magnetic poles, S poles and N poles, are arranged alternately.
- a plurality of indicator portions provided at regular intervals in the circumferential direction;
- a plurality of standard pitch portions respectively provided between the indicator portion and the indicator portion;
- It is composed of a plurality of special pitch sections that are provided in all the standard pitch sections or in one other standard pitch section except for one standard pitch section, and are provided in different modes for each standard pitch section.
- the index part, standard pitch part, and special pitch part have different widths in the circumferential direction of the magnetic pole. It is characterized by.
- the magnetic pole array pattern force in all sections divided by the index portion is different in all sections.
- the force special pitch part in which the standard pitch part is provided between the index part and the index part is different in each section (including the case where there is no special pitch). Therefore, it is possible to identify which section is based on the special pitch part. Therefore, the rotation angle can be specified with a small number of rotations.
- Examples of providing the special pitch part in a different manner for each standard pitch part include changing the position of the special pitch part for each standard pitch part, Examples include changing the number of magnetic poles in the pitch portion.
- An annular magnetic encoder in which a plurality of S poles and N poles, which are magnetic poles, are alternately arranged, and the first track on which a plurality of arrangement patterns having the same magnetic pole arrangement are arranged, and the magnetic pole arrangements are both And a second track on which a plurality of different arrangement patterns are arranged.
- the rotation angle is detected based on the comparison between the arrangement pattern in the first track and the arrangement pattern in the second track.
- the arrangement pattern of the magnetic poles in the second track may be different in the number of magnetic poles included in each arrangement pattern.
- the magnetic pole arrangement pattern in the first track is configured with the same width in the circumferential direction of the magnetic pole, and magnetic poles having the same circumferential width are arranged over the entire track circumference. It is good to be.
- the magnetic pole arrangement pattern in the first track includes an index portion provided at the head and a standard pitch portion having the same number of magnetic poles provided after the index portion, and the index portion and the standard pitch portion. Then, the circumferential widths of the magnetic poles are preferably different from each other.
- the rotation angle can be specified with a small number of rotations.
- FIG. 1 is a perspective view showing a part of a magnetic encoder according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing an arrangement pattern of magnetic poles of the magnetic encoder according to the first embodiment of the present invention.
- FIG. 3 is a graph showing the relationship between the amount of rotation and the angular velocity when the crankshaft rotates at a constant acceleration of up to 600 rpm at the start of the cell motor.
- FIG. 4 is a graph showing the transition of the pulse time when the magnetic encoder according to Example 1 of the present invention is rotated once from the point C in FIG.
- FIG. 5 is a graph showing the transition of the pulse time when the magnetic encoder according to Example 1 of the present invention is rotated once from point D in FIG.
- FIG. 6 is a graph showing the transition of the pulse time when the magnetic encoder according to Example 1 of the present invention makes one rotation of point E in FIG.
- FIG. 7 is a view showing a modification of the magnetic pole arrangement pattern of the magnetic encoder according to Embodiment 1 of the present invention.
- FIG. 8 is a diagram showing an arrangement pattern of magnetic poles of a magnetic encoder according to Embodiment 2 of the present invention.
- FIG. 9 is a perspective view showing a part of a magnetic encoder according to Embodiment 3 of the present invention.
- FIG. 10 is a view showing an arrangement pattern of magnetic poles of a magnetic encoder according to Embodiment 3 of the present invention.
- FIG. 11 is a diagram showing an output signal of a magnetic encoder according to Embodiment 3 of the present invention.
- FIG. 12 is a diagram showing an arrangement pattern of magnetic poles of a magnetic encoder according to Embodiment 4 of the present invention.
- FIG. 13 is a perspective view showing a part of a magnetic encoder according to a conventional example.
- FIG. 1 is a perspective view showing a part of a magnetic encoder according to Embodiment 1 of the present invention.
- the magnetic encoder 1 according to this embodiment includes a wheel lw and a row of tracks la provided on the outer periphery of the wheel lw.
- a detection means 2 for detecting the strength of the magnetic field is provided at a position facing the surface of the track la. Note that the size of the magnetic encoder 1 may be appropriately selected according to the rotating member to be attached.
- the detection means 2 uses a magnetic sensor.
- a magnetic sensor is a sensor that detects magnetic energy. Specific examples of the magnetic sensor include a magnetic head using an electromagnetic induction effect, a differential transformer, a Hall element using an action of converting magnetic force into electricity, and an MR element (magnetoresistance effect element).
- the track la has a configuration in which S poles and N poles, which are magnetic poles, are alternately provided over the entire circumference.
- the magnetic pole located at the position facing the detection means 2 (the detection position by the detection means 2) changes from N pole to S pole or S pole as much as possible.
- the change in the magnetic field at this time is detected as a pulse, and the rotation angle and angular velocity of the magnetic encoder 1 are determined based on the number of detected pulses and the pulse width.
- the track la is 0 ° to 360 ° of the magnetic encoder 1 45 °. It is configured to be able to figure out the positions (0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 °) that were ij damage every 8 minutes! RU
- the arrangement pattern of the magnetic poles in the track la has a configuration in which a predetermined pattern lb is repeatedly provided at regular intervals (45 degree intervals).
- the predetermined pattern lb includes an index ld (index section), a standard pitch pattern (standard pitch section), a fine pitch pattern lc (special pitch section) provided in the standard pitch pattern, and a force.
- the fine pitch pattern lc is provided, and there is only one predetermined pattern lb.
- the index Id, the standard pitch pattern, and the fine pitch pattern lc are the same in that the magnetic poles are alternately provided with S poles and N poles.
- the circumferential width of the magnetic poles becomes narrower in the order of the index Id, the standard pitch pattern, and the fine pitch pattern lc.
- An index Id is provided at the beginning (left end in the figure) of the predetermined pattern lb. Therefore, the index Id is provided over the entire circumference at regular intervals (45 ° intervals).
- a standard pitch pattern arranged at a certain pitch (standard pitch) is provided in an area excluding the index Id in the predetermined pattern lb. Therefore, the standard pitch pattern is provided between the index Id and the index Id.
- a fine pitch pattern lc is provided in each standard pitch pattern except one.
- the predetermined pattern lb is 0 ° to 45 °, 45 ° to 90 °, 90 ° to 135 °, 135 ° to 80 °, 180 ° to 225 °, 225 ° to 270 °, 270 ° to 315 ° and 315 ° to 360 ° are provided.
- the track la is repeatedly provided with a predetermined pattern lb at intervals of 45 ° over the entire circumference!
- the fine pitch pattern lc is composed of two thin N poles and a thin S pole sandwiched between them. As shown in FIG. 2, the fine pitch pattern lc is not provided in the predetermined pattern 1b of 0 ° to 45 °. In the other predetermined pattern lb, the fine pitch pattern lc is arranged so that the position in the predetermined pattern lb is gradually shifted to the rear side as the angle increases. That is, the fine pitch pattern lc is arranged at a different position for each predetermined pattern lb of the track la. Thus, the position of the fine pitch pattern lc is previously associated with the rotation angle. In the present embodiment, as shown in FIG. 1, the magnetic field of the track la is detected by the detection means 2 from the outside of the outer peripheral surface of the magnetic encoder 1.
- the rotation angle can be specified with a small number of rotations.
- the reading order of the N pole and S pole of the index Id of the track la will change, so the reverse rotation can also be determined. It is also possible to make it.
- the magnetic encoder 1 is effective as a non-contact rotation control means, and can also be used for, for example, rotation control of a robot arm.
- the pulse time widths (duties) of the index Id, the standard pitch pattern, and the fine pitch pattern lc in the predetermined pattern lb divided into eight are compared in one track la. Therefore, for example, when the angular velocity changes at the time of startup, it may be difficult to distinguish each of them.
- the standard pitch pattern and fine pitch pattern lc should be set to a pitch width that makes the size of each pitch clear based on the rising characteristics of the angular velocity, and the front and rear pulse widths should be compared.
- the absolute position can be detected.
- FIG. 3 is a graph showing the relationship between the amount of rotation of the crankshaft and the angular velocity at that time.
- the magnetic pole array pattern angle (corresponding to the total width (angle) of S pole width and N pole width) is 8.2 ° for the force index Id and 4. for the standard pitch pattern.
- the case of 6 ° and fine pitch pattern the case of 2.3 ° will be described as an example.
- FIGS. 4 to 6 are graphs showing the transition of the pulse time when the magnetic encoder 1 configured as described above makes one rotation.
- the horizontal axis indicates the detected pulse
- the vertical axis indicates the pulse width (pulse time).
- Figures 4 to 6 show the results when the C point, D point, and E point forces in Fig. 2 are also started.
- the index Id and the fine pitch pattern lc pulses are reliably detected within 90 ° rotation. Therefore, the rotation angle (absolute position) can be detected even at the time of startup.
- the configuration has been shown in which the rotation angle of the predetermined pattern lb can be specified by changing the position of the fine pitch pattern lc in the predetermined pattern lb.
- the fine pitch pattern lc within the predetermined pattern lb itself is different for each predetermined pattern lb, it is possible to specify which predetermined pattern lb is the predetermined pattern lb.
- the number of fine pitch patterns lc in the predetermined pattern lb of the track la is increased at 45 ° intervals.
- Fig. 7 shows a part of the track la.
- the fine pitch pattern lc on the left side has a north pole and a south pole
- the fine pitch pattern lc on the right side has a north pole and a south pole. There are two of them.
- the rotation angle of the magnetic encoder 1 can be specified every 45 ° by specifying the number of magnetic poles in the fine pitch pattern lc within one section between the two indices in the output of the track la. .
- each predetermined pattern lb can be provided with the fine pitch pattern lc in a different manner. This is effective when, for example, a larger number of predetermined patterns lb are provided for the entire circumference where the interval between the predetermined patterns lb is narrow.
- the fine pitch pattern is provided in each standard pitch pattern except one is described as an example, but the fine pitch pattern is different for all the standard pitch patterns. It goes without saying that you may be prepared.
- the width of the magnetic pole in the circumferential direction becomes narrower in the order of the index part (index Id), standard pitch part (standard pitch pattern), and special pitch part (fine pitch pattern lc).
- index Id index part
- standard pitch part standard pitch pattern
- special pitch part fine pitch pattern lc
- Embodiment 2 of the present invention With reference to FIG. 8, a magnetic encoder according to Embodiment 2 of the present invention will be described. In this example, a more specific example of use of the magnetic encoder 1 according to Example 1 described above will be described.
- FIG. 8 is a diagram showing an arrangement pattern of magnetic poles of the magnetic encoder according to the second embodiment of the present invention.
- FIG. 8 shows the magnetic pole arrangement pattern on the track la of the magnetic encoder 1 used for the crankshaft and the magnetic pole arrangement pattern on the track 3a of the magnetic encoder used for the camshaft. Since the magnetic pole arrangement pattern in the track la of the magnetic encoder 1 used for the crankshaft is the same as that in the first embodiment, the description thereof will be omitted as appropriate.
- the crankshaft rotates 360 ° X 2 times, the camshaft rotates 360 °.
- the magnetic encoder 1 having the track la shown in the first embodiment is arranged on the crankshaft, and the magnetic encoder having the track 3a is arranged on the camshaft. To do. This makes it possible to detect the cam signal and cam position signal for the cam.
- the signal detection on the cam side may be the same as the detection means 2 of the magnetic encoder 1. Since the magnetic encoder 1 is as described in the first embodiment, the description is omitted here.
- Track 3a is an array pattern in which S poles and N poles, which are magnetic poles, are arranged in half on the circumference, and each cycle is 360 °.
- 0 ° to 180 ° (N pole) and 180 ° to 360 ° (S pole) in track 3a correspond to 0 to 360 ° in track la of magnetic encoder 1 provided on the crankshaft, respectively. ing.
- the first rotation or the second rotation of the crank is specified by the force of 180 ° to 360 °, which is the force of track 3a 0 ° to 180 °.
- the cam position signal outputs Hi at the N pole from 0 ° to 180 °, detects the first rotation of the crank, and outputs Lo at the S pole from 180 ° to 360 °. Detect the second rotation of the crank and determine the number of rotations of the crank.
- the cam position (cam angle) can be specified together with the crank angle by rotating the crankshaft within 90 °, and the cylinder position can be known. This makes it possible to control the engine while suppressing wasteful fuel injection immediately after starting the engine.
- FIG. 9 is a perspective view showing a part of a magnetic encoder according to Embodiment 3 of the present invention.
- the magnetic encoder 10 according to the present embodiment includes a wheel 10w and a first track 10a and a second track 10b provided on the outer periphery of the wheel 10w.
- Detection means 20 and 30 for detecting the strength of each magnetic field are provided at positions facing the surface of the first track 10a and the surface of the second track 10b.
- the size of the magnetic encoder 10 may be appropriately selected according to the rotating member to be attached.
- the detecting means 20, 30 use magnetic sensors.
- a magnetic sensor is a sensor whose detection target is magnetic energy.
- Specific examples of the magnetic sensor include a magnetic head using an electromagnetic induction action, a differential transformer, a Hall element using an action of converting magnetic force into electricity, and an MR element (magnetoresistance effect element).
- the first track 10a and the second track 10b are provided side by side on the outer periphery of the wheel 10w.
- Each of the first track 10a and the second track 10b has a configuration in which S poles and N poles, which are magnetic poles, are alternately provided over the entire circumference.
- the magnetic pole located at the position facing the detection means 20, 30 (the detection position by the detection means 20, 30) changes from the N pole to the S pole. Or change to N pole as much as possible.
- the change in the magnetic field at this time is detected as a pulse, and the rotation angle and angular velocity of the magnetic encoder 10 are determined based on the number of detected pulses and the pulse width.
- the first track 10a has a configuration in which a plurality of (four) arrangement patterns having the same magnetic pole arrangement are arranged.
- the second track 10b has a configuration in which a plurality (four) of arrangement patterns having different magnetic pole arrangements are arranged.
- the arrangement pattern force with a pair of N pole and S pole as a pair [0, 0 ° to 90 °, 90 ° to 180 °, 180 ° to 270 °] 270 ° to 360 ° are provided.
- the N pole and S pole in each array pattern have the same width in the circumferential direction of the magnetic pole.
- each magnetic pole has a width of 45 °. Therefore, the first track la has a configuration in which N poles and S poles having the same circumferential width are alternately arranged over the entire circumference.
- the magnetic encoder is based on the detection of the magnetic field in the first track la. It is possible to detect the rotation of the encoder 10 every 45 °. In other words, the change in magnetic field when changing from N pole to S pole is detected as a pulse until the change in magnetic field when changing to N pole as much as possible is detected as a pulse (and S pole as much as N pole).
- the magnetic encoder 10 has rotated 45 ° during the period from when the change in the magnetic field was detected as a pulse until the change in the magnetic field from the N pole to the S pole was detected as a pulse. Become.
- the second track lb is 0 ° to 360 of the magnetic encoder 1.
- the arrangement patterns with different numbers of magnetic poles 1S 0 ° to 90 °, 90 ° to 180 °, 180 ° to 270 °, and 270 ° to 360 ° are set. That is, as shown in Fig. 10, one pair of N poles and S poles is arranged from 0 ° to 90 °, and two pairs of N poles and S poles are arranged from 90 ° to 180 °. 180. Up to 270 °, four pairs of N poles and S poles are arranged, and from 270 ° to 360 °, six pairs of N poles and S poles are arranged.
- the number of magnetic poles of each array pattern adjacent to each array pattern (pattern with a pair of N poles and S poles) on the first track la is defined as the rotation angle. It is different depending on. Specifically, the number of magnetic poles is gradually increased as the rotation angle increases. Thus, the arrangement pattern in the second track lb is previously associated with the rotation angle.
- FIG. 11 shows output signals from the detection means 20 and 30. As shown in Fig. 11, the N pole is Hi, the S pole is Lo, and the output signal from the first track 10a has a waveform with a 90 ° interval as one cycle.
- the output signals from the second track 10b are respectively in the 90 ° region of 0 ° to 90 °, 90 ° to 180 °, 180 ° to 270 °, 270 ° to 360 °. Waveforms with different periods.
- the number of switching pulses between Hi and Lo is 0 between 0 ° to 45 ° and 45 ° to 90 °, and 1 between 90 ° to 135 ° and 135 ° to 180 °.
- the switching pulse between Hi and Lo is 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 °, 315 ° Not counting.
- the first track 10a outputs a pulse that switches from Lo to Hi, and then obtains a pulse that switches from Lo to Hi.
- the number of switching pulses between Hi and Lo is 1 as output by the second track 10b. This shows that the position where the pulse that switches from Lo to Hi was obtained at the first track 10a is 180 °.
- the rotation angle can be specified with a small number of rotations. Even when the magnetic encoder 10 rotates in the reverse direction, the Hi and Lo order of the second track 10b changes in one section of the switching pulse between Hi and Lo of the first track 10a. It is also possible to discriminate, and reverse rotation can be stopped with a small number of rotations.
- the magnetic encoder 10 according to the present embodiment is effective as a non-contact rotation control means, and can be used for, for example, rotation control of a robot arm.
- Example 4
- FIG. 12 is a diagram showing an arrangement pattern of magnetic poles of a magnetic encoder according to Embodiment 4 of the present invention.
- the present embodiment is a modification of the third embodiment.
- the arrangement pattern of the magnetic poles at intervals of 45 ° has an index (index part) at the head, and the number of magnetic poles after the index.
- Equally arranged patterns are formed, and all are configured with the same array pattern.
- the circumferential width of the magnetic pole in the indicator portion is different from the circumferential width of the magnetic pole in the standard pitch portion.
- the magnetic pole array patterns at intervals of 45 ° are all different in the number of magnetic poles, and are different from each other.
- the N track and S pole in the second track are one set, and the number of sets in each array pattern is different. In this example, the number of single poles is varied. Yes.
- the number of magnetic poles in the second track is 4 at 0 ° to 45 °, 5 at 45 ° to 90 °, 6 at 90 ° to 135 °, and so on. As the angle increases by 45 °, the number of magnetic poles increases by one! ] As a result, as the rotation angle increases, the switching pulse between Hi and Lo increases by one for each array pattern.
- a pair of magnetic poles having the same width are arranged adjacent to the index of the first track, and subsequently, the width varies depending on each arrangement pattern.
- the magnetic pole is arranged.
- the reason why the first track is provided with an index is to clarify the switching every 45 °.
- the output pulse from the first track has a short pulse width in the portion other than the index where the pulse width is long in the index portion. Therefore, the change at every 45 ° can be detected by changing the pulse width.
- the rotation angle can be specified in the range of 45 ° to 90 ° by comparing the output from the first track and the output from the second track. .
- the rotation angle is determined from the number of Hi-Lo switching pulses of the second track until the first index is detected in the first track and the next index is detected for the force.
- the configuration in which the number of magnetic poles is increased in units of N poles and S poles for each constant rotation angle in the second track is adopted.
- a configuration is adopted in which the number of magnetic poles is increased in units of a single pole for each rotation angle.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006529067A JP4586800B2 (ja) | 2004-07-12 | 2005-07-12 | 磁気エンコーダ |
US11/632,107 US7667455B2 (en) | 2004-07-12 | 2005-07-12 | Annular magnetic encoder having pole arrangement that specifies rotational angle |
EP05760181A EP1775559A1 (en) | 2004-07-12 | 2005-07-12 | Magnetic encoder |
KR1020077002850A KR100919068B1 (ko) | 2004-07-12 | 2005-07-12 | 자기 엔코더 |
CNB2005800234056A CN100491922C (zh) | 2004-07-12 | 2005-07-12 | 磁编码器 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2004-204895 | 2004-07-12 | ||
JP2004204894 | 2004-07-12 | ||
JP2004204895 | 2004-07-12 | ||
JP2004-204894 | 2004-07-12 | ||
JP2004-320400 | 2004-11-04 | ||
JP2004320400 | 2004-11-04 |
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WO2006006605A1 true WO2006006605A1 (ja) | 2006-01-19 |
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PCT/JP2005/012863 WO2006006605A1 (ja) | 2004-07-12 | 2005-07-12 | 磁気エンコーダ |
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Country | Link |
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US (1) | US7667455B2 (ja) |
EP (1) | EP1775559A1 (ja) |
JP (1) | JP4586800B2 (ja) |
KR (1) | KR100919068B1 (ja) |
CN (1) | CN100491922C (ja) |
WO (1) | WO2006006605A1 (ja) |
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JP2007252178A (ja) * | 2006-02-14 | 2007-09-27 | Ricoh Co Ltd | ブラシレスモータの駆動制御装置、画像読取装置及び画像形成装置 |
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JP5379748B2 (ja) * | 2010-06-03 | 2013-12-25 | Ntn株式会社 | 磁気エンコーダ |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59501227A (ja) * | 1982-07-05 | 1984-07-12 | ソシエテ フランセ−ズ デキツプマント プ−ル ラ ナビガシヨン アエリエン(エス.エフ.エ.エン.ア.) | 数値出力を有する回転式角度位置検出装置 |
JPS6333603A (ja) * | 1987-01-24 | 1988-02-13 | Keihin Densokuki Kk | 光学的位置検出装置 |
JPH0618283A (ja) * | 1992-07-03 | 1994-01-25 | Nikon Corp | 光電式アブソリュートエンコーダ |
JPH0618547A (ja) * | 1992-07-02 | 1994-01-25 | Canon Inc | 移動方向検出方法 |
JP2000018971A (ja) * | 1998-06-30 | 2000-01-21 | Toshiba Corp | エンコーダ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746862A (en) * | 1985-05-14 | 1988-05-24 | Victor Company Of Japan Ltd. | Apparatus for detecting both rotational speed and reference rotational angle of a rotary member |
US4785241A (en) * | 1985-08-08 | 1988-11-15 | Canon Denshi Kabushiki Kaisha | Encoder unit using magnetoresistance effect element |
JPH0660824B2 (ja) * | 1985-08-14 | 1994-08-10 | 株式会社日立製作所 | 絶対位置検出装置 |
JPH0638047B2 (ja) * | 1985-10-09 | 1994-05-18 | 株式会社日立製作所 | 磁気的に位置を検出する装置 |
US5461311A (en) * | 1992-12-24 | 1995-10-24 | Kayaba Kogyo Kabushiki Kaisha | Rod axial position detector including plural scales wherein nonmagnetized portions have differing spacing and differing depths and means for calculating the absolute position are provided |
JP3185199B2 (ja) | 1993-08-31 | 2001-07-09 | 大同特殊鋼株式会社 | 多極着磁磁石とその着磁方法 |
US6246233B1 (en) * | 1994-12-30 | 2001-06-12 | Northstar Technologies Inc. | Magnetoresistive sensor with reduced output signal jitter and temperature compensation |
JP3395518B2 (ja) | 1995-05-31 | 2003-04-14 | トヨタ自動車株式会社 | 内燃機関のクランク角検出装置 |
US5841274A (en) * | 1997-01-29 | 1998-11-24 | Mitutoyo Corporation | Induced current absolute position transducer using a code-track-type scale and read head |
JPH11229948A (ja) | 1998-02-06 | 1999-08-24 | Unisia Jecs Corp | エンジンの回転位置検出装置 |
-
2005
- 2005-07-12 WO PCT/JP2005/012863 patent/WO2006006605A1/ja active Application Filing
- 2005-07-12 US US11/632,107 patent/US7667455B2/en not_active Expired - Fee Related
- 2005-07-12 KR KR1020077002850A patent/KR100919068B1/ko not_active IP Right Cessation
- 2005-07-12 EP EP05760181A patent/EP1775559A1/en not_active Withdrawn
- 2005-07-12 CN CNB2005800234056A patent/CN100491922C/zh not_active Expired - Fee Related
- 2005-07-12 JP JP2006529067A patent/JP4586800B2/ja not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59501227A (ja) * | 1982-07-05 | 1984-07-12 | ソシエテ フランセ−ズ デキツプマント プ−ル ラ ナビガシヨン アエリエン(エス.エフ.エ.エン.ア.) | 数値出力を有する回転式角度位置検出装置 |
JPS6333603A (ja) * | 1987-01-24 | 1988-02-13 | Keihin Densokuki Kk | 光学的位置検出装置 |
JPH0618547A (ja) * | 1992-07-02 | 1994-01-25 | Canon Inc | 移動方向検出方法 |
JPH0618283A (ja) * | 1992-07-03 | 1994-01-25 | Nikon Corp | 光電式アブソリュートエンコーダ |
JP2000018971A (ja) * | 1998-06-30 | 2000-01-21 | Toshiba Corp | エンコーダ |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007252178A (ja) * | 2006-02-14 | 2007-09-27 | Ricoh Co Ltd | ブラシレスモータの駆動制御装置、画像読取装置及び画像形成装置 |
US7679533B2 (en) | 2007-10-02 | 2010-03-16 | Renco Encoders Inc. | Photodiode array for an optical encoder, photodiode detection system, and optical encoder |
US20110291646A1 (en) * | 2008-03-17 | 2011-12-01 | Mitsubishi Electric Corporation | Origin position signal detector |
Also Published As
Publication number | Publication date |
---|---|
CN100491922C (zh) | 2009-05-27 |
JPWO2006006605A1 (ja) | 2008-04-24 |
US7667455B2 (en) | 2010-02-23 |
CN1985150A (zh) | 2007-06-20 |
KR100919068B1 (ko) | 2009-09-28 |
EP1775559A1 (en) | 2007-04-18 |
JP4586800B2 (ja) | 2010-11-24 |
US20080061771A1 (en) | 2008-03-13 |
KR20070032356A (ko) | 2007-03-21 |
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