WO2010026752A1 - 磁気式回転検出装置およびその製造方法 - Google Patents
磁気式回転検出装置およびその製造方法 Download PDFInfo
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- WO2010026752A1 WO2010026752A1 PCT/JP2009/004330 JP2009004330W WO2010026752A1 WO 2010026752 A1 WO2010026752 A1 WO 2010026752A1 JP 2009004330 W JP2009004330 W JP 2009004330W WO 2010026752 A1 WO2010026752 A1 WO 2010026752A1
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- magnetic
- magnet body
- ring
- case body
- concave portion
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- 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
- G01D5/14—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 the magnitude of a current or voltage
- G01D5/142—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 the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—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 the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to a magnetic rotation detection device for detecting an angular position, a rotation speed, and the like of a rotating body and a method for manufacturing the same.
- a magnetic rotation detection device has more dust and moisture than the optical type rotation detection device.
- a magnetic rotation detection device generally includes a magnet body in which a magnetic pole pair composed of an S pole and an N pole is formed, and a magnetosensitive element that detects an angular position and a rotation speed when the magnet body rotates. Even if dust or moisture adheres to the magnet body, the sensitivity does not decrease.
- a magnetic rotation detection device for example, a plurality of magnetic pole pairs composed of an S pole and an N pole are formed on the outer peripheral surface of the magnet body, and a magnetosensitive element is disposed at a position facing the outer peripheral surface of the magnet body.
- an object of the present invention is to provide a magnetic rotation detection device capable of aligning a magnet body and a magnetosensitive element with high accuracy without performing laborious processing, and a method for manufacturing the same. Is to provide.
- a magnetic pole pair including an S pole and an N pole is formed, and a magnet body provided on the rotating body side is opposed to the magnet body in the direction of the rotation center axis of the rotating body.
- a magnetic rotation detecting device including a partition member interposed between the magnet body and the magnetosensitive element, and a fixing member fixed to a surface of the partition member on the side where the magnet body is located.
- the center of the magnetosensitive element is located on the center axis of the ring, the magnet body is disposed in a non-contact state with respect to the ring inside the ring, and The center of the magnet body is located on the central axis of the ring.
- the partition member is disposed between the magnet body and the magnetic sensing element, and the positions of the magnetic sensing element and the magnet body are adjusted with reference to the ring fixed to the partition member.
- the magnetic element and the magnet body can be arranged with high positional accuracy.
- a pair of S pole and N pole is formed on the magnet body. That is, in the present invention, the number of magnetic pole pairs formed in the magnet body is reduced, and instead, the resolution obtained by performing arithmetic processing such as performing interpolation processing to obtain a zero cross point on the signal obtained by the magnetosensitive element, for example. Secure. According to such a configuration, the number of magnetic pole pairs formed on the magnet body is reduced to a minimum of one pair, so that sufficient sensitivity can be obtained even if the magnet body and the magnetosensitive element are somewhat separated. Therefore, a partition member can be provided between the magnet body and the magnetosensitive element, and the ring can be fixed to the partition member. The magnetic sensing element can be protected from dust and moisture by the partition member.
- the magnetosensitive element is disposed in a recess that is recessed toward the side where the magnet body is located in the partition member.
- the magnetosensitive element is mounted on a substrate, and the substrate is disposed so as to overlap a substrate receiving portion formed around the recess in the partition member, and the magnetosensitive element is disposed on the recess. It is preferable that a gap is provided between the bottom portion.
- the magnetosensitive element has a drawback that it is vulnerable to stress, when such a configuration is adopted, the magnetosensitive element can be disposed in a non-contact state on the bottom of the recess. Therefore, even when the magnetosensitive element and the magnet body are brought close to each other, no stress is applied to the magnetosensitive element, so that the magnetosensitive element exhibits high sensitivity.
- the magnetic sensitive element is positioned in the concave portion with an outer peripheral end portion of the magnetic sensitive element in contact with an inner peripheral side surface of the concave portion. According to such a configuration, it is possible to improve the positional accuracy between the magnetic sensing element and the recess, and as a result, after the partition member and the magnet body are aligned with respect to the ring, the partition member is attached to the magnetic sensing element. Improve the positional accuracy of the magnetosensitive element and the magnet body in either case of fixing or after positioning the magnetosensitive element and the magnet body with reference to the ring and then fixing the magnetosensitive element to the partition member be able to.
- the magnetosensitive element can employ a configuration in which a protective layer is provided on the surface, and an outer peripheral end portion of the protective layer is in contact with an inner peripheral side surface of the concave portion. If comprised in this way, even if it makes the outer peripheral edge part of a magnetosensitive element contact the inner peripheral side surface of a recessed part, an extra stress will not be added to a magnetosensitive element.
- the said recessed part is provided with the bottom part and four inner peripheral side surfaces, Out of the outer peripheral end parts of the said protective layer, two side parts adjacent in the circumferential direction are among the said four inner peripheral side surfaces. It is preferable that the two magnetic peripheral elements are in contact with two adjacent inner peripheral side surfaces, and the magnetic sensing element is positioned in the concave portion by the two inner peripheral side surfaces.
- the concave portion has four inner peripheral side surfaces, when the outer peripheral end portion of the protective layer is brought into contact with the four inner peripheral side surfaces, high dimensional accuracy is required between the concave portion and the protective layer.
- the protective layer may be inclined and disposed in the recess, and if it is small, positioning is not performed.
- the outer peripheral end of the protective layer is brought into contact only with two adjacent inner peripheral side surfaces, the magnetosensitive element can be obtained without securing high dimensional accuracy between the concave portion and the protective layer. The positioning in the in-plane direction can be performed.
- the concave portion includes a large-diameter first concave portion and a second concave portion that is recessed at a substantially central position of a bottom portion of the first concave portion, and an outer peripheral end portion of the protective layer is formed in the second concave portion. It is preferable that the second concave portion is positioned in contact with the peripheral side surface.
- annular groove surrounding the recess is formed on a surface side of the partition member where the magnet body is located, and an end of the ring on the side where the magnetosensitive element is located fits in the annular groove. Preferably it is. If comprised in this way, a ring can be reliably fixed to the predetermined position of a partition member.
- the ring is preferably a magnetic shield member made of a magnetic material. If comprised in this way, even if it does not use a dedicated shield member, a magnetic shield can be performed with the ring used for positioning.
- the spacer further includes a spacer fixed to a stationary body side of a device on which the magnetic rotation detection device is mounted, and the spacer includes a through hole in which the magnet body is disposed, and the through The inner diameter of the hole is the same as the outer diameter of the ring, and the ring is fitted in the through hole so as to be positioned between the inner wall of the through hole and the outer peripheral surface of the magnet body.
- a magnetosensitive element can be arrange
- a magnetic pole pair composed of an S pole and an N pole is formed, and includes a magnet body provided on the rotating body side, and a magnetosensitive element facing the magnet body in the rotation center axis direction of the rotating body.
- a ring is fixed to a surface of the partition member on the side where the magnet body is located, A first alignment step of fixing the magnetosensitive element to the partition member after aligning the ring and the magnetosensitive element so that the center of the magnetosensitive element is positioned on the center axis of the ring; And after the first alignment step, a second alignment step of aligning the ring and the magnet body so that the center of the magnet body is positioned on the center axis of the ring.
- the partition member is disposed between the magnet body and the magnetic sensing element, and the positions of the magnetic sensing element and the magnet body are adjusted with reference to the ring fixed to the partition member.
- the magnetic element and the magnet body can be arranged with high positional accuracy.
- the partition member is provided with a recess having an inner peripheral side surface with which the outer peripheral end of the magnetosensitive element abuts and recessed toward the side where the magnet body is positioned, and in the first alignment step, In fixing the magnetic sensing element to the partition member, it is preferable to position the magnetic sensing element by bringing the outer peripheral end of the magnetic sensing element into contact with the inner peripheral side surface of the recess. According to this configuration, it is possible to improve the positional accuracy between the magnetic sensing element and the recess, and as a result, the magnetic sensing element and the magnet body when the magnetic sensing element and the magnet body are aligned with respect to the ring. The positional accuracy can be improved.
- the magnetosensitive element can be disposed in a non-contact state on the bottom of the recess, so that no extra stress is applied to the magnetosensitive element.
- a second operation of inserting a cylindrical portion of a jig between the inner wall of the through hole and the outer peripheral surface of the magnet body and aligning the spacer and the magnet body via the jig, and the magnetic After fixing the spacer to the stationary body side of the device on which the rotation detection device is mounted, the third operation to remove the jig, and the position between the inner wall of the through hole and the outer peripheral surface of the magnet body It is preferable to perform a fourth operation of fitting the ring into the through hole. If comprised in this way, a magnetosensitive element and a magnet body can be easily arrange
- the partition member is disposed between the magnet body and the magnetic sensing element, and the positions of the magnetic sensing element and the magnet body are adjusted with reference to the ring fixed to the partition member.
- the magnetic element and the magnet body can be arranged with high positional accuracy.
- (A), (b) is the external view of the magnetic-type rotation detection apparatus which concerns on Embodiment 1 of this invention, and its disassembled perspective view.
- (A), (b) is sectional drawing which shows typically the structure of the principal part of the magnetic type rotation detection apparatus based on Embodiment 1 of this invention, and explanatory drawing which shows the detection principle.
- (A), (b) is the perspective view of the principal part of the magnetic type rotation detection apparatus which concerns on Embodiment 1 of this invention, and the perspective view of the state which isolate
- FIGS. 3A and 3B are a perspective view of a main part of the magnetic rotation detection device according to the first embodiment of the present invention, and a perspective view in a state where the magnet body and the circuit unit are separated.
- 4 and 5 are explanatory views of the state where the circuit unit of the magnetic rotation detection device according to the first embodiment of the present invention is disassembled as seen from the side of the first case body, and explanations as seen from the side of the second case body.
- a magnetic rotation detection device 10 shown in FIGS. 1A, 1B, and 2A is a device that magnetically detects the rotation position, rotation direction, and rotation speed of a rotating body.
- the rotation of the rotating shaft 22 of the motor 2 is detected.
- the rotation of the rotating shaft 22 is detected based on the motor case 27.
- the magnetic rotation detection device 10 is configured integrally with the motor 2 and constitutes the motor 1 with an encoder.
- the rotating shaft 22 corresponds to the opposite end portion of the output shaft 28 of the motor 2.
- the magnetic rotation detection device 10 includes a magnet body 20 fixed to the rotation shaft 22 of the motor 2, and a circuit unit 30 in which a substrate 40 on which a magnetosensitive element 42 and a semiconductor IC 46 are mounted is incorporated in a case 33.
- the magnetosensitive element 42 faces the magnet body 20 in the direction of the rotation center axis L of the rotation shaft 22.
- the magnetosensitive element 42 is composed of an MR element, and the magnetoresistive film 421 is arranged in a predetermined pattern.
- the magnet body 20 includes a metal magnet holder 21 fixed to the rotating shaft 22 and a disk-shaped permanent magnet 25, and the permanent magnet 25 has a flange portion 213 that expands at the tip of the magnet holder 21. It is fixed to the upper surface of the substrate with an adhesive.
- the permanent magnet 25 has a pair of S and N poles magnetized in the circumferential direction on the surface facing the magnetosensitive element 42.
- the rotation detection circuit constituted by the semiconductor IC 46 of the circuit unit 30 is output from a pair of amplifier circuits 481 that output signals from the magnetosensitive element 42 and these amplifier circuits 481.
- An arithmetic circuit 482 (interpolation circuit) that obtains a zero cross point by performing interpolation processing or the like on the sine wave signals sin and cos and an output interface 483 are provided. This is done via a female connector 48 mounted on the cable.
- the 30 case 33 includes a resin-made first case body 31 positioned on the magnet body 20 side with respect to the substrate 40 and a resin-made second case positioned on the opposite side of the substrate 40 from the magnet body 20 side.
- the first case body 31 constitutes a partition member that is interposed between the magnet body 20 and the magnetic sensitive element 42.
- the first case body 31 includes a substantially rectangular plate-shaped portion 315 and three side plate portions 316 that stand up toward the second case body 32 at positions corresponding to the three sides of the plate-shaped portion 315.
- the circular portion 315 is formed with a circular concave portion 318 that is recessed from the plate-shaped portion 315 side toward the outer surface side where the magnet body 20 is located.
- the first case body 31 is a resin molded product, and the bottom 318 a of the recess 318 is thinner than the portion of the plate-like portion 315 other than the recess 318.
- a substrate receiving portion 315a made up of small protrusions is formed in a portion surrounding the concave portion 318. For this reason, the board
- the substrate 40 has a magnetosensitive element 42 mounted at the approximate center of the surface facing the magnet body 20 (see FIGS. 4 and 5).
- a semiconductor IC 46 and a female connector 48 constituting a rotation detection circuit are mounted on the back surface side of the substrate 40, and the female connector 48 is in the vicinity of a side of the plate-like portion 315 where the side plate portion 316 is not formed. Has been implemented.
- the magnetosensitive element 42 when the substrate 40 is supported by the substrate receiving portion 315a, the magnetosensitive element 42 is disposed in the recess 318, and the bottom 318a of the recess 318 is disposed in the magnetosensitive element 42. And function as a partition wall interposed between the magnet body 20 and the magnet body 20. In this state, a gap is interposed between the magnetosensitive element 42 and the bottom 318a (inner bottom) of the recess 318, and the magnetosensitive element 42 and the bottom 318a of the recess 318 are in a non-contact state (FIG. )reference).
- a circular annular groove 319 is formed on the outer surface side of the plate-like portion 315 where the magnet body 20 is located so as to surround the bottom portion 318 a of the recess 318 as shown in FIG.
- the end of the annular ring 15 is fitted in the annular groove 319 and fixed by a method such as adhesion. Only the end of the ring 15 opposite to the side where the magnet body 20 is located (the side where the magnetic sensing element 42 is located) is fitted in the annular groove 319, and the opposite end is the bottom of the recess 318. It protrudes to the side where the magnet body 20 is located from 318a (see FIG. 3).
- the inner diameter of the ring 15 is slightly larger than the outer diameter of the magnet body 20.
- the permanent magnet 25 and the flange portion 213 of the magnet body 20 are located inside the ring 15 configured as described above, and in this state, the ring 15 is disposed on the outer peripheral surface of the magnet body 20 in the radial direction outside via a gap. Opposite states.
- the ring 15 is made of a magnetic material and has a function of performing a magnetic shield on the magnet body 20. Further, in the magnetic rotation detection device 10 of the present embodiment, the centers of the magnet body 20 and the magnetosensitive element 42 are aligned with the ring 15 as a reference, as will be described later. For this reason, the center of the magnetosensitive element 42 is located on the center axis of the ring 15, and the center of the magnet body 20 is located on the center axis of the ring 15.
- the second case body 32 has a substantially rectangular plate-like portion 325 facing the plate-like portion 315 of the first case body 31 and a side plate portion 316 of the first case body 31 at a position corresponding to three sides of the plate-like portion 325.
- Three side plate portions 326 that stand up toward each other, and in the first case body 31 and the second case body 32, the sides on which the side plate portions 316 and 326 are formed coincide with each other. For this reason, when the second case body 32 is put on the first case body 31, the side plate portions 316 and 326 overlap each other, but the position corresponding to one side of the four sides opens to the outside. It becomes. Therefore, since the female connector 48 is exposed to the outside, the male connector 49 can be coupled to the female connector 48.
- the plate-like portion 325 has a protrusion 325c that presses the substrate 40 against the substrate receiving portion 315a.
- the side plate portion 316 of the first case body 31 covers the outer surface of the side plate portion 326 of the second case body 32.
- the side plate portion 326 of the second case body 32 is directed to the first case body 31 from the inner peripheral side of the thick portion 326c formed of the root portion.
- the thin portion 326d extends, and the width dimension of the thin portion 326d is slightly wider than the portion overlapping the side plate portion 316 of the first case body 31.
- a first groove portion 36 is formed between the step portion 326 a with the portion 326 d and the leading edge of the side plate portion 316 of the first case body 31.
- the first groove portion 36 is formed in a continuous state over all of the three side plate portions 316 and 326 of the first case body 31 and the second case body 32. Therefore, in this embodiment, the sealing agent 35 is applied to the entire first groove portion 36 formed over the three side plate portions 316 and 326 and then solidified to prevent water from entering the case 33.
- the space between the first case body 31 and the second case body 32 is greatly opened, but before or after the male connector 49 is coupled to the female connector 48, If the sealing agent 35 is applied and solidified on such a portion, water can be prevented from entering the case 33.
- a silicone resin etc. can be used.
- a small projection 326e (see FIG. 4) for fixing is formed on the side plate portion 326 of the second case body 32, while the small projection 326e is fitted on the plate-like portion 315 of the first case body 31.
- a small hole 315e (see FIG. 5) is formed at the bottom. Therefore, when the small protrusion 326e of the second case body 32 is fitted into the small hole 315e of the first case body 31, the first case body 31 and the second case body 32 can be coupled.
- the case 33 of the circuit unit 30 is fixed to the motor case 27 via the spacer 50 having a rectangular parallelepiped shape. That is, the spacer 50 is fixed to the end surface of the motor case 27 by the two bolts 59 as the fastening members at the diagonal position, and the case 33 is fixed to the end surface of the spacer 50 by the two bolts 39 at the diagonal position.
- the spacer 50 is fixed to the end surface of the motor case 27 by the two bolts 59 as the fastening members at the diagonal position
- the case 33 is fixed to the end surface of the spacer 50 by the two bolts 39 at the diagonal position.
- the second case body 32 is formed with two cylindrical portions 328 through which the shaft portion of the bolt 39 passes continuously from the side plate portion 326. ing.
- the plate-like portion 315 of the first case body 31 has a circular shape so as to avoid the cylindrical portion 328.
- An arcuate notch 317 is formed.
- the magnet body 20 is located between the outer peripheral surface of the cylindrical portion 328 and the inner peripheral surface of the notch 317 in the rotation center axis L direction.
- a second groove portion 37 is formed that opens toward the positioned side.
- the sealing agent 35 when the sealing agent 35 is applied to the first groove portion 36, the sealing agent 35 is also applied to the second groove portion 37.
- the 1st groove part 36 and the 2nd groove part 37 comprise the groove part which was connected and continued. For this reason, in the case 33, the entire circumference except for the portion where the female connector 48 is disposed is sealed with the sealing agent 35.
- the outer shape of the spacer 50 used in this embodiment is a rectangular parallelepiped shape, a circular through hole 51 opened in the direction of the rotation center axis L of the rotating shaft 22 is formed, and the magnet body 20 is placed in the through hole 51.
- the inner diameter dimension of the through hole 51 is larger than the outer diameter dimension of the flange portion 213 of the magnet body 20, and an annular gap is formed between the inner peripheral surface of the through hole 51 and the outer peripheral surface of the magnet body 20. Is formed.
- the end of the ring 15 is inserted into the gap.
- the outer diameter of the ring 15 is substantially the same as the inner diameter of the through hole 51, and the ring 15 is in a state of being fitted in the through hole 51. In this state, a gap is interposed between the outer peripheral surface of the flange portion 213 of the magnet body 20 and the inner peripheral surface of the ring 15. In this way, the ring 15 is positioned in the radial direction with respect to the spacer 50.
- FIG. 6 is an explanatory diagram showing a method for manufacturing the magnetic rotation detection device 10 of the present embodiment.
- the ring 15 is fixed to the first case body 31 before being coupled to the second case body 32 in the first alignment step, and the ring 15 After aligning the ring 15 and the magnetosensitive element 42 so that the center of the magnetosensitive element 42 is positioned on the center axis of the substrate 40, the substrate 40 is fixed to the first case body 31. More specifically, for example, the ring 15 and the substrate 40 are held by each of the two robot hands, the positions thereof are adjusted, and then the substrate 40 is fixed to the first case body 31.
- the substrate 40 is temporarily bonded to the first case body 31 using a quick-drying adhesive such as UV adhesive, and then the substrate 40 is bonded to the first case body 31 using an adhesive made of a thermosetting resin. Glue. Thereafter, the first case body 31 is covered with the second case body 32, and the small groove 315e of the second case body 32 is fitted into the small hole 315e of the first case body 31 and fixed. After the sealing agent 35 is applied to the groove portion 37, it is solidified and the case 33 is sealed.
- a quick-drying adhesive such as UV adhesive
- the ring 15 and the magnet body 20 are aligned so that the center of the magnet body 20 is positioned on the center axis of the ring 15.
- the shaft portion 211 A set screw 219 is fitted into a hole formed in the peripheral surface from the side to restrict movement in the rotation direction, and the magnet body 20 is fixed to the rotating shaft 22.
- the spacer 50 is disposed on the end surface of the motor case 27 so that the magnet body 20 enters the through hole 51 of the spacer 50 (first operation).
- the cylindrical portion 61 of the jig 60 is inserted between the inner wall of the through hole 51 of the spacer 50 and the outer peripheral surface of the magnet body 20, and the jig 60 is interposed therebetween.
- the spacer 50 and the magnet body 20 are aligned (second operation). That is, the jig 60 includes a cylindrical portion 61 having a constant thickness in the circumferential direction, and the inner diameter of the cylindrical portion 61 is substantially the same as the outer dimensions of the flange portion 213 of the magnet body 20 and the permanent magnet 25.
- the inner diameter of the through hole 51 of the spacer 50 is substantially the same. Therefore, in the state shown in FIGS. 6C and 6E, the through hole 51 of the spacer 50, the flange portion 213 of the magnet body 20, and the permanent magnet 25 are arranged concentrically.
- the magnetic rotation detection device 10 is assembled in a state where the ring 15 and the magnet body 20 are aligned so that the center of the magnet body 20 is positioned on the center axis of the ring 15.
- the ring 15 is fixed to the plate-like portion 315 of the first case body 31 interposed as a partition member between the magnet body 20 and the magnetic sensing element 42.
- the positions of the magnet body 20 and the magnetic sensing element 42 are determined based on the ring 15. That is, in the method of manufacturing the magnetic rotation detection device 10, the position of the magnetic sensing element 42 on the first case body 31 is determined with reference to the ring 15, and the spacer 15 and the jig 60 are used as a reference.
- the positions of the magnetosensitive element 42 and the magnet body 20 are determined. Therefore, the positional accuracy between the magnetosensitive element 42 and the magnet body 20 is high.
- the ring 15 when the ring 15 is fixed to the first case body 31, the ring 15 is fitted in the annular groove 319 surrounding the recess 318, so that the ring 15 is securely fixed to a predetermined position of the first case body 31. can do.
- the ring 15 functions as a magnetic shield part for the magnet body 20
- magnetic shielding can be performed without using a dedicated shield member.
- the number of magnetic pole pairs formed in the magnet body 20 is reduced, and instead, for example, interpolation processing is performed on the signal obtained by the magnetosensitive element 42 to obtain a zero cross point.
- the resolution is ensured by performing arithmetic processing such as obtaining. According to such a configuration, the number of magnetic pole pairs formed on the magnet body 20 is reduced to a minimum of a pair, so that sufficient sensitivity is provided even if the magnet body 20 and the magnetosensitive element 42 are somewhat separated.
- the magnet body 20 and the magnetosensitive element 42 are opposed to each other in the direction of the rotation center axis L of the rotary shaft 22, even if the magnet body 20 and the magnetosensitive element 42 are somewhat separated from each other, the magnetosensitive element A sine wave signal with little waveform distortion can be obtained via the line 42. Therefore, a partition wall (the bottom 318 a of the recess 318 of the first case body 31) can be provided between the magnet body 20 and the magnetic sensing element 42.
- the first case body 31 and the second case body 32 cover the magnetosensitive element 42, and the first case body 31 and the second case body 32 are surrounded around the magnetosensitive element 42.
- the sealing agent 35 is applied to the joint portion. For this reason, case 33 can be made into a waterproof structure, and magnetic sensing element 42 can be reliably protected from water.
- the partition wall portion is a bottom portion 318a of the recess portion 318 that is recessed toward the side where the magnet body 20 is located in the plate-like portion, and the magnetosensitive element 42 is disposed in the recess portion 318.
- the magnetosensitive element 42 and the magnet body 20 can be made to approach.
- the substrate 40 on which the magnetosensitive element 42 is mounted is disposed so as to overlap the substrate receiving portion 315a formed around the recess 318 in the plate-like portion 315, and the magnetosensitive element 42 is connected to the bottom 318a of the recess 318. There is a gap between them.
- the magnetic sensitive element 42 can be arrange
- the space between the first case body 31 and the second case body 32 is sealed with the sealing agent 35 applied between them, the side plate portions 316 of the first case body 31 and the second case body 32 are used. 326 can be effectively prevented from entering water.
- the sealing agent 35 is applied to the inside of the first groove portion 36 and the second groove portion 37.
- the 1st groove part 36 and the 2nd groove part 37 comprise the groove part which was connected and continued. For this reason, in the case 33, the entire circumference except for the portion where the female connector 48 is disposed is sealed with the sealing agent 35, so that the entry of water can be reliably prevented.
- the step portion 326a is provided on the side plate portion 326 of the second case body 32 to provide the first.
- the groove portion 36 is formed, when the side plate portion 326 of the second case body 32 overlaps the outer surface of the side plate portion 316 of the first case body 31, a step portion is provided on the side plate portion 316 of the first case body 31 to provide the first groove portion. 36 may be formed.
- FIG. 7 is an external view of a circuit unit used in the magnetic rotation detector according to Embodiment 2 of the present invention.
- 8A and 8B are a plan view of a circuit unit used in the magnetic rotation detection device according to the second embodiment of the present invention, and an enlarged cross section when the circuit unit is cut along the line AA ′.
- FIG. FIG. 9 and FIG. 10 are explanatory views of the state where the circuit unit of the magnetic rotation detection device according to the first embodiment of the present invention is disassembled as seen from the first case body side, and explanations as seen from the second case body side.
- 11A and 11B are an explanatory view of a recess formed in the first case body used in the magnetic rotation detection device according to the second embodiment of the present invention, and a cross-sectional view of the magnetosensitive element. Note that the basic configuration of the present embodiment is substantially the same as that of the first embodiment, and therefore, portions having common functions are denoted by the same reference numerals and description thereof is omitted. The overall configuration of the magnetic rotation detector will be described with reference to FIG.
- the magnetic rotation detection device 10 of the present embodiment is also a magnet body fixed to the rotation shaft 22 of the motor 2 as in the first embodiment. 20 and a circuit unit 30 in which a substrate 40 on which a magnetic sensing element 42 and a semiconductor IC 46 are mounted is built in a case 33, and the magnetic sensing element 42 has a rotational center of the rotary shaft 22 with respect to the magnet body 20. It faces in the direction of the axis L.
- the magnetosensitive element 42 is composed of an MR element, and the magnetoresistive film 421 is arranged in a predetermined pattern.
- the magnet body 20 includes a disk-like permanent magnet 25, and the permanent magnet 25 is magnetized in the circumferential direction with a pair of S and N poles on the surface facing the magnetosensitive element 42.
- the magnetic rotation detection device 10 of the present embodiment is similar to the first embodiment in that the case 33 of the circuit unit 30 is
- the first case body 31 includes a first case body 31 positioned on the magnet body 20 side with respect to the substrate 40, and a second case body 32 positioned on the opposite side of the substrate 40 from the magnet body 20 side. 31 constitutes a partition member interposed between the magnet body 20 and the magnetic sensing element 42.
- the first case body 31 includes a substantially pentagonal plate-like portion 315, and four side plate portions 316 erected from the outer peripheral end of the plate-like portion 315 toward the second case body 32.
- a part of the plate-like portion 315 stands up at an inner position from the outer peripheral end portion.
- the plate-like portion 315 is formed with a circular recess 318 that is recessed from the plate-like portion 315 toward the outer surface where the magnet body 20 is located.
- the bottom 318a of the recess 318 is thinner than the portion of the plate-like portion 315 other than the recess 318.
- the annular inner peripheral wall portion 318g of the recess 318 is a conical surface inclined so as to reduce the inner diameter of the recess 318 from the opening edge 318h of the recess 318 toward the bottom 318a.
- an area surrounded by the side plate portion 316 is an arrangement space for the substrate 40, and the substrate 40 is arranged in a portion surrounded by the side plate portion 316 on the inner surface of the plate-like portion 315.
- the substrate 40 is supported in a posture facing the plate-like portion 315 by a plurality of protrusions 315s (substrate receiving portions) formed on the plate-like portion 315.
- the plate-like portion 315 is formed with holes 315k through which the bolts 39 shown in FIG.
- a semi-cylindrical projection 315p is formed at a corner portion of the plate-like portion 315 that is connected to the side plate portion 316, and the projection 315p indicates a position where the substrate 40 is to be disposed.
- the first case body 31 is a resin molded product such as PPS as in the first embodiment.
- the first case body 31 is made of a conductive resin molded product filled with a conductive filler.
- the substrate 40 has a magnetosensitive element 42 mounted at the approximate center on the surface side facing the magnet body 20.
- a semiconductor IC 46 and a female connector 48 constituting a rotation detection circuit are mounted on the back side of the substrate 40, and the female connector 48 is not formed with the side plate portion 316 of the plate-like portion 315. It is mounted near the side.
- the concave portion 318 has a large diameter first. 1 recess 318p and a second recess 318r recessed with a substantially rectangular planar shape at a substantially central position of the bottom 318a of the first recess 318p.
- the second recess 318r includes a bottom 318s and four inner peripheral side surfaces 318t, 318u, 318v and 318w.
- the magnetosensitive element 42 includes an element body 424 made of a magnetoresistive pattern and a protective layer 422 covering the element body 424.
- the magnetosensitive element 42 is formed with a magnetoresistive pattern as the element body 424, a surface protective layer (not shown) covering the magnetoresistive pattern, a terminal 426, etc. on one surface of a nonmagnetic substrate such as glass.
- the protective layer 422 is composed of a nonmagnetic substrate.
- the planar shape of the magnetosensitive element 42 is defined by the shape of the nonmagnetic substrate as the protective layer 422 and is substantially rectangular.
- the planar size of the magnetosensitive element 42 is slightly smaller than the second recess 318r shown in FIGS. 8B and 11A, and the magnetosensitive element 42 is fitted inside the second recess 318r. is there.
- the outer peripheral end 420 of the magnetosensitive element 42 (the outer peripheral end of the protective layer 422)
- two sides adjacent in the circumferential direction are the four inner peripheral side surfaces 318t, 318u, 318v of the second recess 318r, Of the 318w, it is in contact with two adjacent inner peripheral side surfaces 318t and 318u.
- the magnetic sensitive element 42 is positioned in the in-plane direction by the inner peripheral side surfaces 318t and 318u in the second recess 318r.
- the substrate 40 configured in this manner is supported by the protrusions 315s of the plate-like portion 315 when disposed in the first case body 31.
- there is a gap between the protective layer 422 of the magnetosensitive element 42 and the bottom 318a of the recess 318 (the bottom 318s of the second recess 318r), and the magnetoresistive element 42 and the bottom 318a (the first 318a of the recess 318). 2 is in a non-contact state with the bottom 318s) of the recess 318r.
- a circular annular groove 319 is formed on the outer surface side where the magnet body 20 is located in the plate-like portion 315 so as to surround the bottom portion 318 a of the recess 318, and in the annular groove 319, An end of the annular ring 15 is fitted and fixed by a method such as adhesion. Also in this embodiment, as in Embodiment 1, only the end of the ring 15 opposite to the side on which the magnet body 20 is located (the side on which the magnetosensitive element 42 is located) is fitted in the annular groove 319. The opposite end projects from the bottom 318a of the recess 318 to the side where the magnet body 20 is located.
- the inner diameter dimension of the ring 15 is slightly larger than the outer diameter dimension of the magnet body 20 shown in FIG.
- the permanent magnet 25 and the flange portion 213 of the magnet body 20 are located inside the ring 15 configured as described above, and in this state, the ring 15 is disposed on the outer peripheral surface of the magnet body 20 in the radial direction outside via a gap. Opposite states.
- the ring 15 is made of a magnetic material and has a function of performing a magnetic shield on the magnet body 20. Further, in the magnetic rotation detection device 10 of the present embodiment, the positions of the magnet body 20, the first case body 31, and the substrate 40 are aligned with respect to the ring 15, as will be described later.
- the second recess 318r is formed such that the center of the magnetosensitive element 42 is located at the center of the annular groove 319. Therefore, according to the manufacturing method described later, the center of the magnetosensitive element 42 is located on the center axis of the ring 15, and the center of the magnet body 20 is located on the center axis of the ring 15.
- the second case body 32 includes a plate-like portion 325 facing the plate-like portion 315 of the first case body 31, and the outer shape of the plate-like portion 325 substantially overlaps the side plate portion 316 of the first case body 31. It has a shape.
- the side plate portion 326 stands up from the outer peripheral end of the plate-like portion 325 toward the side plate portion 316 of the first case body 31, and the second case body is in relation to the first case body 31.
- the side plate portion 316 and the side plate portion 326 overlap in the inner and outer directions so that the side plate portion 316 is positioned outside the side plate portion 326.
- the protruding dimension (height dimension) of the side plate part 326 from the plate-like part 325 is shorter than the protruding dimension (height dimension) of the side plate part 316 from the plate-like part 315.
- the side plate portion 326 of the second case body 32 does not reach the plate-like portion 315 of the first case body 31 in a state where the second case body 32 is covered with the first case body 31, and the side plate portion 326. There is a gap between the lower end of the plate and the plate-like portion 315.
- a protrusion 325 t is formed at a portion where the end portion of the side plate portion 326 is interrupted, and when the second case body 32 is covered with the first case body 31, the protrusion 325t is hooked on the side plate portion 326 so as to ride on the upper end portion of the side plate portion 326. Therefore, even when a structure in which the second case body 32 is dropped inside the first case body 31 is employed, the height position of the second case body 32 is defined.
- the second case body 32 is covered with the first case body 31 in this way, a part of the first case body 31 and the second case body 32 are opened sideways. It becomes. Accordingly, the female connector 48 is exposed to the outside.
- the side plate portion 326 is interrupted at a portion other than the side where the female connector 48 is disposed. However, the interrupted portion of the side plate portion 326 is blocked by the side plate portion 316 of the first case body 31. Will be removed.
- a plurality of shallow recesses 316c are formed from a midway position in the height direction to the upper edge, while the side plate portion of the second case body 32 is formed.
- the outer surface of 326 is flat.
- the first case body 31 and the second case body 32 can be joined to form the case 33, and the adhesive between the side plate portion 316 and the side plate portion 326 can be formed. It can be reliably blocked by 33f. Therefore, the case 33 has a waterproof performance.
- the lower end portion of the side plate portion 326 of the second case body 32 is also fixed to the side plate portion 316 of the first case body 31 with the adhesive 33f, but the lower end portion of the side plate portion 326 and the plate shape of the first case body 31 are also fixed. There is a gap between the part 315 and the part 315.
- the second case body 32 is not lifted by the adhesive 33f that has entered between the lower end portion of the side plate portion 326 and the plate-like portion 315, so that the second case body 32 is accurately positioned at a predetermined height. Fixed.
- the interrupted portion of the side plate portion 326 is blocked only by the side plate portion 316, but in such a portion, the sealing material is provided between the upper end edge of the side plate portion 316 and the end portion of the plate-like portion 325 of the second case body 32. If the is applied, the waterproof performance of the case 33 can be ensured.
- the second case body 32 is entirely made of a metal made of an iron-based magnetic material and has conductivity.
- the first case body 31 is also conductive. For this reason, if the 1st case body 31 and the 2nd case body 32 are made to contact in any one part, the 1st case body 31 and the 2nd case body 32 will be in the state which is electrically connected. That is, in this embodiment, a wiring material or the like is connected from the first case body 31 or the second case body 32 to the substrate 40, the motor case 27 (see FIG. 1), or a motor frame (not shown) fixed to the motor case 27. Then, it is possible to conduct to the ground.
- the electric noise that tries to enter the case 33 from the outside flows through the first case body 31 and the second case body 32 to the ground via the wiring material. Therefore, it is possible to protect the semiconductor IC 46 and the magnetosensitive element 42 constituting the rotation detection circuit described with reference to FIG. 2B from electrical noise.
- the signal is less susceptible to electrical noise from the surroundings. Therefore, the magnetic rotation detection device 10 can perform desired detection without being affected by disturbance noise. Further, the side of the magnetic sensitive element 42 where the substrate 40 is located is covered with the plate-like portion 325 of the second case body 32 and is magnetically shielded.
- the plate-like portion 325 of the second case body 32 is formed with an oval or perfect circle hole 325h.
- the hole 325h communicates with the inside of the case 33 and opens at a position overlapping the semiconductor IC 46 mounted on the substrate 40, the wiring pattern of the substrate 40, and the like. For this reason, from the hole 325h, the terminal of the semiconductor IC 46 mounted on the substrate 40, the wiring of the substrate 40, and the like can be seen. Therefore, in the circuit unit 30 of this embodiment, as shown in FIG. 1A, even after the magnetic rotation detector 10 is mounted on the motor 2, if the pin-like terminal is inserted from the hole 325h, the semiconductor IC 46 On the other hand, it is possible to perform parameter input or parameter change for offset adjustment or the like.
- the circuit unit 30 and the magnet body 20 are completed with the motor 2 mounted thereon, so that the characteristics are obtained only after the circuit unit 30 and the magnet body 20 are mounted on the motor 2.
- the check cannot be performed, in the magnetic rotation detection device 10 of the present embodiment, since the hole 325h is formed in the plate-like portion 325 of the second case body 32, even if the second case body 32 is not removed, Parameters can be input or changed for the semiconductor IC 46. Therefore, it is possible to input or change parameters for the semiconductor IC 46 while monitoring the magnetic rotation detection device 10 mounted on the motor 2 while the second case body 32 is provided. Adjustment can be performed in the state of the finished product in which the influence of the second case body 32 made of a body exists.
- a sheet 99 such as a seal is pasted and the hole 325h is closed as shown by a one-dot chain line L99 in FIG. No foreign matter enters inside 33. Since others are the same as those of the first embodiment, description thereof is omitted.
- the ring 15 is attached to the first case body 31 before being coupled to the second case body 32. Is fixed, and the ring 15 and the magnetosensitive element 42 are aligned so that the center of the magnetosensitive element 42 is positioned on the center axis of the ring 15, and then the substrate 40 is fixed to the first case body 31. To do. More specifically, for example, the ring 15 and the substrate 40 are held by each of the two robot hands, the positions thereof are adjusted, and then the substrate 40 is fixed to the first case body 31.
- the magnetic sensitive element 42 is fitted and positioned in the second recess 318r.
- a gap is interposed between the magnetosensitive element 42 and the bottom 318s of the second recess 318r, and the magnetosensitive element 42 and the bottom 318s of the second recess 318r are in a non-contact state.
- the substrate 40 is permanently bonded to the first case body 31 using an adhesive made of a thermosetting resin. To do.
- the first case body 31 is covered with the second case body 32, and in this state, the sealing adhesive 33f is poured into the gap 33g between the side plate portion 316 and the side plate portion 326, and the first case body 31 and The second case body 32 is coupled to form the case 33.
- the ring 15 and the magnet body 20 are aligned so that the center of the magnet body 20 is positioned on the center axis of the ring 15.
- a set screw 219 is fitted from the side into a hole formed in the peripheral surface of the shaft portion 211 to restrict movement in the rotation direction, and the magnet body 20 is fixed to the rotation shaft 22.
- the spacer 50 is disposed on the end surface of the motor case 27 so that the magnet body 20 enters the through hole 51 of the spacer 50 (first operation).
- the cylindrical portion 61 of the jig 60 is inserted between the inner wall of the through hole 51 of the spacer 50 and the outer peripheral surface of the magnet body 20, and the jig 60 is interposed therebetween.
- the spacer 50 and the magnet body 20 are aligned (second operation).
- the magnetic rotation detection device 10 is assembled in a state where the ring 15 and the magnet body 20 are aligned so that the center of the magnet body 20 is positioned on the center axis of the ring 15.
- the ring 15 is fixed to the plate-like portion 315 of the first case body 31 interposed as a partition member between the magnet body 20 and the magnetic sensing element 42.
- the positions of the magnet body 20, the first case body 31, and the substrate 40 are aligned with respect to the ring 15. Further, the first case body 31 and the substrate 40 are aligned by positioning the magnetic sensing element 42 in the second recess 318 r of the first case body 31. For this reason, the positional accuracy of the magnetosensitive element 42 and the magnet body 20 can be improved.
- the magnetic sensitive element 42 is reliably secured in two directions orthogonal to each other within the second concave portion 318r. Can be positioned. That is, when the second recess 318r includes four inner peripheral side surfaces 318t, 318u, 318v, and 318w, the outer peripheral end 420 of the protective layer 422 is brought into contact with the four inner peripheral side surfaces 318t, 318u, 318v, and 318w. In this case, high dimensional accuracy is required between the second recess 318r and the protective layer 422.
- the protective layer 422 may be inclined and disposed in the second recess 318r, and if it is small, positioning is not performed.
- the outer peripheral end portion 420 of the protective layer 422 is brought into contact with only two adjacent inner peripheral side surfaces 318t and 318u, so that high dimensional accuracy is ensured between the second concave portion 318r and the protective layer 422. Even if it is not, positioning of the magnetosensitive element 42 in the in-plane direction can be performed.
- the magnetic sensitive element 42 includes a protective layer 422, and the outer peripheral end 420 (the outer peripheral end 420 of the magnetic sensitive element 42) of the protective layer 422 is in contact with the inner peripheral side surfaces 318 t and 318 u of the recess 318. For this reason, even if the magnetosensitive element 42 is brought into contact with the recess 318, no excessive stress is applied to the element body 424.
- the ring 15 since the ring 15 is made of a magnetic material, it functions as a magnetic shield portion for the magnet body 20.
- the second case body 32 since the second case body 32 is also made of a magnetic material, it functions as a magnetic shield portion for the magnetosensitive element 42.
- the second case body 32 since the second case body 32 includes the plate-like portion 325 and the side plate portion 326, the magnetic sensing element 42 is in a state in which substantially the entire periphery is magnetically shielded. Therefore, in the case 33, the semiconductor IC 46 and the magnetic sensing element 42 constituting the rotation detection circuit are protected from magnetic noise without using a dedicated shield member because the case 33 is not easily affected by magnetic noise from the surroundings. Can do.
- the magnetic sensing element 42 detects a rotating magnetic field generated from the magnet body 20. Therefore, if the magnetic sensing element 42 is magnetically shielded by the second case body 32, the rotating magnetic field generated from the magnet body 20 is less likely to be disturbed, so that the magnetic sensing element 42 can detect a rotating magnetic field without any disturbance. It becomes.
- the first case body 31 is non-magnetic, even if the partition wall portion (the bottom portion 318a of the recess 318) of the first case body 31 is interposed between the magnet body 20 and the magnetic sensing element 42, the magnet The first case body 31 does not prevent the magnetic field lines from moving from the body 20 to the magnetic sensing element 42, and there is no hindrance to rotation detection.
- the second case body 32 opposite to the side where the magnet body 20 is located with respect to the magnetic sensing element 42 is made of a magnetic material. For this reason, since the magnetic force lines of the magnet body 20 can be efficiently guided to the side where the second case body 32 is located, that is, the side where the magnetosensitive element 42 is located, the detection sensitivity of the magnetic rotation detection device 10 is improved. There is an advantage that you can.
- both the first case body 31 and the second case body 32 have conductivity, the inside of the case 33 is electrically shielded. For this reason, the semiconductor IC 46 and the magnetic sensitive element 42 can be protected from electrical noise.
- the second case body 32 since the second case body 32 includes the plate-like portion 325 and the side plate portion 326, the semiconductor IC 46 and the magnetosensitive element 42 are in a state where substantially the entire periphery is electrically shielded. For this reason, the signal output from the magnetosensitive element 42 is not easily affected by electrical noise.
- the first case body 31 includes a partition wall (the bottom 318a of the recess 318) interposed between the magnet body 20 and the magnetic sensing element 42, the semiconductor IC 46 and the magnetic sensing element 42 are completely surrounded. It is in an electrically shielded state. Therefore, the signal output from the magnetosensitive element 42 is not easily affected by electrical noise, and thus has high detection sensitivity.
- the second case body 32 is formed with a hole 325 h communicating with the case 33. For this reason, even if the second case body 32 is not removed from the magnetic rotation detection device 10, if a pin-like terminal is inserted from the hole of the second case body 32, a soft IC is provided for the semiconductor IC 46 provided in the case 33. Downloading can be performed, and parameter input and parameter change for offset adjustment and the like can be performed. In addition, since the characteristic check and adjustment of the magnetic rotation detector 10 can be performed in the state where the second case body 32 made of a magnetic material exists, adjustment including the magnetic influence of the second case body 32 can be performed. Can be done.
- the rotating body is the rotating shaft 22 of the motor 2 and the stationary body is the motor case 27.
- the magnet body 20 is formed on the rotating body of another rotating mechanism, and the stationary body supports the rotating body.
- the circuit unit 30 may be attached to the body via the spacer 50.
- “stationary” in the stationary body means to confront “rotation” of the rotating shaft 22, and includes the case where the stationary body itself moves together with the rotating shaft 22.
- the stationary body may be a member other than the motor case 27, for example, a part of a device on which the motor 2 is mounted.
- the permanent magnet 25 is formed with a pair of S and N poles, but the present invention may be applied when a plurality of pairs of S and N poles are formed.
- the positioning using the ring 15 is applied in the case of two case bodies.
- the substrate 40 on which the magnetosensitive element 42 is mounted is made of a resin having a small stress.
- the present invention may be applied to a structure in which a short glass fiber is integrally molded with a BMC resin mixed with a reinforcing agent or a filler in a thermosetting resin mainly composed of an unsaturated polyester resin.
- the partition member is formed by the portion covering the magnetic sensitive element 42 in the mold resin.
- a gap is secured between the magnetosensitive element 42 and the bottom 318 of the recess 318 and the bottom 318s of the second recess 318r.
- the magnetosensitive element 42 is provided.
- the protective layer of the magnetosensitive element 42 and the bottom of the recess may be brought into contact with each other.
- positioning is performed between the second concave portion 318r having a square planar shape and the magnetic sensing element 42.
- the positioning is performed by bringing the second concave portion 318r and the magnetic sensing element 42 into contact with each other.
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Abstract
Description
2 モータ
10 磁気式回転検出装置
15 リング
20 磁石体
22 モータの回転軸(回転体)
27 モータケース(静止体)
40 基板
42 感磁素子
33 ケース
21 磁石ホルダ
25 永久磁石
30 回路ユニット
31 第1ケース体(仕切り部材)
32 第2ケース体
35 シール剤
36 第1溝部
37 第2溝部
50 スペーサ
51 スペーサの貫通穴
60 冶具
61 冶具の筒部
315、325 ケース体の板状部
316、326 ケース体の側板部
318 第1ケース体の凹部
318a 第1ケース体の凹部の底部(隔壁部)
318p 第1凹部
318r 第2凹部
318t、318u、318v、318w 第2凹部の内周側面
319 環状溝
326a 側板部の段部
411 素子本体
412 保護層
420 感磁素子の外周端部(保護層の外周端部)
(磁気式回転検出装置の全体構成)
図1(a)、(b)は、本発明の実施の形態1に係る磁気式回転検出装置の外観図、およびその分解斜視図である。図2(a)、(b)は、本発明の実施の形態1に係る磁気式回転検出装置の要部の構成を模式的に示す断面図、およびその検出原理を示す説明図である。図3(a)、(b)は、本発明の実施の形態1に係る磁気式回転検出装置の要部の斜視図、および磁石体と回路ユニットを分離させた状態の斜視図である。図4および図5は、本発明の実施の形態1に係る磁気式回転検出装置の回路ユニットを分解した様子を第1ケース体の側からみた説明図、および第2ケース体の側からみた説明図である。
図1(a)、(b)、図2(a)、図3(a)、(b)、図4、および図5に示すように、本形態の磁気式回転検出装置10において、回路ユニット30のケース33は、基板40に対して磁石体20側に位置する樹脂製の第1ケース体31と、基板40に対して磁石体20側とは反対側に位置する樹脂製の第2ケース体32とを備えており、第1ケース体31は、磁石体20と感磁素子42との間に介在する仕切り部材を構成している。
このように構成した第1ケース体31と第2ケース体32とを重ねると、第1ケース体31の側板部316は、第2ケース体32の側板部326の外面に被さる。かかる重なりを利用して側板部316、326同士を接合するにあたって、第2ケース体32の側板部326には、その根元部分からなる肉厚部分326cの内周側から第1ケース体31に向けて肉薄部分326dが延びており、かかる肉薄部分326dの幅寸法は、第1ケース体31の側板部316との重なる部分よりもわずかに幅広である。このため、第1ケース体31と第2ケース体32とを重ねると、第1ケース体31の側板部316と第2ケース体32の側板部326との間には、肉厚部分326cと肉薄部分326dとの段部326aと第1ケース体31の側板部316の先端縁との間には第1溝部36が形成される。かかる第1溝部36は、第1ケース体31および第2ケース体32の3つの側板部316、326の全てにわたって連続した状態に形成される。そこで、本形態では、3つの側板部316、326にわたって形成された第1溝部36の全体にシール剤35を塗布後、固化させて、ケース33内への水の侵入を防止している。なお、雌コネクタ48が位置する部分では、第1ケース体31と第2ケース体32との間が大きく開口しているが、雌コネクタ48に雄コネクタ49を結合する前、あるいは結合の後、かかる部分にもシール剤35を塗布、固化させれば、ケース33内への水の侵入を防止することができる。シール剤35の材質については限定はないが、シリコーン樹脂などを用いることができる。
このように構成した磁気式回転検出装置10において、回路ユニット30のケース33は、外形が直方体形状のスペーサ50を介してモータケース27に固定されている。すなわち、モータケース27の端面に対してスペーサ50が対角位置で締結部材としての2本のボルト59により固定され、ケース33は、対角位置で2本のボルト39によりスペーサ50の端面に固定されている。かかる締結を行なうにあたって、第1ケース体31および第2ケース体32の双方にボルト59を通す円筒部を形成すると、接合部分でのシール性が低下する。そこで、本形態では、第1ケース体31および第2ケース体32のうち、第2ケース体32のみに、ボルト39の軸部を通す2つの円筒部328が側板部326から連続して形成されている。また、本形態では、円筒部328の周りからケース33内に水が侵入することを防止することを目的に、第1ケース体31の板状部315には、円筒部328を避けるように円弧状の切り欠き317が形成されている。また、第1ケース体31と第2ケース体32とを重ねると、円筒部328の外周面と切り欠き317の内周面との間には、回転中心軸線L方向のうち、磁石体20が位置する側に向けて開口する第2溝部37が形成される。そこで、本形態では、第1溝部36にシール剤35を塗布する際、第2溝部37内にもシール剤35を塗布している。ここで、第1溝部36と第2溝部37は、繋がって連続した溝部を構成している。このため、ケース33では、雌コネクタ48が配置されている部分を除く全周がシール剤35で封止されている。
図6は、本形態の磁気式回転検出装置10の製造方法を示す説明図である。本形態の磁気式回転検出装置10を製造するには、まず、第1位置合わせ工程において、第2ケース体32と結合する前の第1ケース体31にリング15を固定しておき、リング15の中心軸線上に感磁素子42の中心が位置するようにリング15と感磁素子42との位置合わせを行なった後、基板40を第1ケース体31に固定する。より具体的には、例えば、2つのロボットハンドの各々にリング15、および基板40を保持させ、その位置を調整した後、基板40を第1ケース体31に固定する。その際、基板40を第1ケース体31にUV接着剤など速乾性の接着剤を用いて仮接着した後、熱硬化性樹脂からなる接着剤を用いて基板40を第1ケース体31に本接着する。しかる後に、第1ケース体31に第2ケース体32を被せ、第2ケース体32の小突起326eを第1ケース体31の小穴315eに嵌めて固定した状態で、第1溝部36および第2溝部37にシール剤35を塗布した後、固化させ、ケース33を封止する。
以上説明したように、本形態の磁気式回転検出装置10では、磁石体20と感磁素子42との間に仕切り部材として介在する第1ケース体31の板状部315にリング15が固定され、かかるリング15を基準に磁石体20および感磁素子42の位置が決められている。すなわち、磁気式回転検出装置10の製造方法においては、リング15を基準に第1ケース体31上における感磁素子42の位置を決め、スペーサ50および冶具60を利用して、リング15を基準に感磁素子42および磁石体20の位置を決めている。それ故、感磁素子42と磁石体20との間の位置精度が高い。
上記実施の形態1では、第1ケース体31の側板部316が第2ケース体32の側板部326の外面に重なるため、第2ケース体32の側板部326に段部326aを設けて第1溝部36を形成したが、第2ケース体32の側板部326が第1ケース体31の側板部316の外面に重なる場合、第1ケース体31の側板部316に段部を設けて第1溝部36を形成してもよい。
(磁気式回転検出装置の構成)
図7は、本発明の実施の形態2に係る磁気式回転検出装置に用いた回路ユニットの外観図である。図8(a)、(b)は、本発明の実施の形態2に係る磁気式回転検出装置に用いた回路ユニットの平面図、および回路ユニットをA-A′線で切断したときの拡大断面図である。図9および図10は、本発明の実施の形態1に係る磁気式回転検出装置の回路ユニットを分解した様子を第1ケース体の側からみた説明図、および第2ケース体の側からみた説明図である。図11(a)、(b)は、本発明の実施の形態2に係る磁気式回転検出装置に用いた第1ケース体に形成した凹部の説明図、および感磁素子の断面図である。なお、本形態の基本的な構成は、実施の形態1と略同様であるため、共通する機能を有する部分には同一の符号を付してそれらの説明を省略する。また、磁気式回転検出装置全体の構成については、図1を参照して説明する。
本形態の磁気式回転検出装置10を製造する場合にも、実施の形態1と同様、まず、第1位置合わせ工程において、第2ケース体32と結合する前の第1ケース体31にリング15を固定しておき、リング15の中心軸線上に感磁素子42の中心が位置するようにリング15と感磁素子42との位置合わせを行なった後、基板40を第1ケース体31に固定する。より具体的には、例えば、2つのロボットハンドの各々にリング15、および基板40を保持させ、その位置を調整した後、基板40を第1ケース体31に固定する。その際、感磁素子42を第2凹部318rに嵌めて位置決めする。この状態で、感磁素子42と第2凹部318rの底部318sとの間には隙間が介在しており、感磁素子42と第2凹部318rの底部318sは非接触状態にある。また、基板40を第1ケース体31にUV接着剤など速乾性の接着剤を用いて仮接着した後、熱硬化性樹脂からなる接着剤を用いて基板40を第1ケース体31に本接着する。しかる後に、第1ケース体31に第2ケース体32を被せ、この状態で、側板部316と側板部326との間の隙間33gにシール用の接着剤33fを流し込んで第1ケース体31と第2ケース体32とを結合させ、ケース33を構成する。
以上説明したように、本形態の磁気式回転検出装置10では、磁石体20と感磁素子42との間に仕切り部材として介在する第1ケース体31の板状部315にリング15が固定され、かかるリング15を基準に磁石体20、第1ケース体31および基板40の位置が合わせられている。また、第1ケース体31の第2凹部318rに感磁素子42を位置決めすることにより、第1ケース体31と基板40との位置合わせが行なわれている。このため、感磁素子42と磁石体20との位置精度を向上することができる。
上記実施の形態では、回転体がモータ2の回転軸22で、静止体がモータケース27であったが、他の回転機構の回転体に磁石体20を形成し、かかる回転体を支持する静止体にスペーサ50を介して回路ユニット30を取り付けてもよい。なお、静止体における「静止」とは、回転軸22の「回転」に対峙する意味であり、静止体自身が、回転軸22とともに移動する場合も含む意味である。また、静止体については、モータケース27以外の部材、例えば、モータ2が搭載される機器の一部であってもよい。
Claims (18)
- S極とN極からなる磁極対が形成され、回転体側に設けられる磁石体と、
該磁石体に対して前記回転体の回転中心軸線方向で対向する感磁素子と、
を有する磁気式回転検出装置において、
さらに、前記磁石体と前記感磁素子との間に介在する仕切り部材と、該仕切り部材において前記磁石体が位置する側の面に固定されたリングと、を備え、
前記感磁素子の中心は前記リングの中心軸線上に位置し、
前記磁石体は、前記リングの内側に当該リングに対して非接触状態で配置され、かつ、当該磁石体の中心は、前記リングの中心軸線上に位置していることを特徴とする磁気式回転検出装置。 - 前記磁石体には、S極とN極とが一対形成されていることを特徴とする請求項1に記載の磁気式回転検出装置。
- 前記感磁素子は、前記仕切り部材において前記磁石体が位置する側に向けて凹んだ凹部内に配置されていることを特徴とする請求項1に記載の磁気式回転検出装置。
- 前記感磁素子は、基板上に実装され、
当該基板は、前記仕切り部材において前記凹部の周りに形成された基板受け部に重ねて配置され、
前記感磁素子は、前記凹部の底部との間に隙間を隔てていることを特徴とする請求項3に記載の磁気式回転検出装置。 - 前記感磁素子は、該感磁素子の外周端部が前記凹部の内周側面に当接して当該凹部に位置決めされていることを特徴とする請求項3に記載の磁気式回転検出装置。
- 前記感磁素子は、表面に保護層を備え、
当該保護層の外周端部が前記凹部の内周側面に接していることを特徴とする請求項5に記載の磁気式回転検出装置。 - 前記凹部は、底部と4つの内周側面とを備えており、
前記保護層の外周端部のうち、周方向で隣接する2つの辺部は、前記4つの内周側面のうち、隣接する2つの内周側面に当接し、
前記感磁素子は、前記2つの内周側面によって前記凹部に位置決めされていることを特徴とする請求項6に記載の磁気式回転検出装置。 - 前記凹部は、大径の第1凹部と、該第1凹部の底部の略中央位置で凹む第2凹部とを備え、
前記保護層の外周端部は、前記第2凹部の内周側面に当接して前記感磁素子を前記第2凹部に位置決めしていることを特徴とする請求項7に記載の磁気式回転検出装置。 - 前記仕切り部材において前記磁石体が位置する面側には前記凹部を囲む環状溝が形成され、
当該環状溝内に前記リングにおいて前記感磁素子が位置する側の端部が嵌っていることを特徴とする請求項3に記載の磁気式回転検出装置。 - 前記リングは、磁性材料からなる磁気シールド部材であることを特徴とする請求項1に記載の磁気式回転検出装置。
- 前記磁気式回転検出装置が搭載される機器の静止体側に固定されるスペーサを有し、
当該スペーサは、前記磁石体が内側に配置される貫通穴を備えるとともに、当該貫通穴の内径寸法は前記リングの外径寸法と同一であり、
前記貫通穴内には、該貫通穴の内壁と前記磁石体の外周面との間に位置するように前記リングが嵌っていることを特徴とする請求項1乃至10の何れか一項に記載の磁気式回転検出装置。 - S極とN極からなる磁極対が形成され、回転体側に設けられる磁石体と、
該磁石体に対して前記回転体の回転中心軸線方向で対向する感磁素子と、
を有する磁気式回転検出装置の製造方法において、
前記磁石体と前記感磁素子との間に配置される仕切り部材において前記仕切り部材において前記磁石体が位置する側の面にリングを固定しておき、
当該リングの中心軸線上に前記感磁素子の中心が位置するように前記リングと前記感磁素子との位置合わせを行なった後、前記仕切り部材に前記感磁素子を固定する第1位置合わせ工程と、
該第1位置合わせ工程の後、前記リングの中心軸線上に前記磁石体の中心が位置するように前記リングと前記磁石体との位置合わせを行なう第2位置合わせ工程と、
を有することを特徴とする磁気式回転検出装置の製造方法。 - 前記仕切り部材に、前記感磁素子の外周端部が当接する内周側面をもって前記磁石体が位置する側に向けて凹んだ凹部を設けておき、
前記第1位置合わせ工程において前記仕切り部材に前記感磁素子を固定するにあたっては、前記感磁素子の外周端部を前記凹部の内周側面に当接させて当該感磁素子の位置決めを行なうことを特徴とする請求項12に記載の磁気式回転検出装置の製造方法。 - 前記仕切り部材に前記感磁素子を固定した状態で前記感磁素子と前記凹部の底部との間には隙間が空いていることを特徴とする請求項13に記載の磁気式回転検出装置の製造方法。
- 前記感磁素子は、表面に保護層を備え、
当該保護層の外周端部が前記凹部の内周側面に接していることを特徴とする請求項13または14に記載の磁気式回転検出装置の製造方法。 - 前記凹部は、底部と4つの内周側面とを備えており、
前記保護層の外周端部のうち、周方向で隣接する2つの辺部を、前記4つの内周側面のうち、隣接する2つの内周側面に当接させ、
前記感磁素子を、前記2つの内周側面によって前記凹部に位置決めすることを特徴とする請求項15に記載の磁気式回転検出装置の製造方法。 - 前記凹部は、大径の第1凹部と、該第1凹部の底部の略中央位置で凹む第2凹部とを備え、
前記保護層の外周端部を前記第2凹部の内周側面に当接させて前記感磁素子を当該第2凹部に位置決めすることを特徴とする請求項16に記載の磁気式回転検出装置の製造方法。 - 前記第2位置合わせ工程では、
前記リングの外径寸法と同一の内径寸法を備えた貫通穴を有するスペーサを、前記貫通穴内に前記磁石体が位置するように配置する第1操作と、
前記貫通穴の内壁と前記磁石体の外周面との間に冶具の筒部を挿入して当該冶具を介して前記スペーサと前記磁石体との位置合わせを行なう第2操作と、
前記磁気式回転検出装置が搭載される機器の静止体側に前記スペーサを固定した後、前記冶具を取り外す第3操作と、
前記貫通穴の内壁と前記磁石体の外周面との間に位置するように前記リングを前記貫通穴内に嵌める第4操作と、
を行なうことを特徴とする請求項12乃至17の何れか一項に記載の磁気式回転検出装置の製造方法。
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- 2009-09-02 WO PCT/JP2009/004330 patent/WO2010026752A1/ja active Application Filing
- 2009-09-02 US US13/062,547 patent/US8854035B2/en active Active
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CN102124304A (zh) | 2011-07-13 |
JP2010085394A (ja) | 2010-04-15 |
JP5330930B2 (ja) | 2013-10-30 |
CN102124304B (zh) | 2013-01-02 |
US20110227563A1 (en) | 2011-09-22 |
US8854035B2 (en) | 2014-10-07 |
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