Encoder and motor with encoder

Abstract

The utility model discloses an encoder and a motor with the encoder, which are favorable for improving the anti-interference capability of a detection element. The encoder of the utility model is provided with: a holder; a cover forming a receiving space between the cover and the holder; and a circuit board which is provided with a detection element and a circuit having a signal ground, and which is provided at least partially in the housing space such that a plate surface on one side in the thickness direction is at least partially covered by the cover, the circuit board further comprising: a shield member which is an integrally formed conductive member, and which is provided in the housing space; the cover plate is at least partially arranged in the accommodating space in a manner of covering the whole plate surface on the other side of the thickness direction of the circuit substrate; and a first connector, which is a conductive member and electrically connects the shield member and the signal ground.

Description

TECHNICAL FIELD

[0001] The utility model relates to an encoder and a motor with the encoder. BACKGROUND

[0002] In the past, an encoder has a holding seat, a cover that forms a receiving space with the holding seat, and a circuit board that is provided with a detection element and a circuit with signal ground and is disposed in the receiving space with the board surface on the thickness direction side covered by the cover.

[0003] However, in practice, when the above-mentioned encoder is fixed to a motor via the holding seat to form a motor with the encoder, the detection element is easily affected by motor frame ground noise and electromagnetic noise from the other side of the thickness direction of the circuit board, resulting in a decrease in detection accuracy and the like. SUMMARY

[0004] The utility model is just in view of the above-mentioned problem and completes, the purpose lies in providing a kind of encoder and motor with the encoder, it is helpful to improve the anti-interference ability of detection element.

[0005] To achieve the above object, the utility model provides a kind of encoder, with: holding seat;Cover, the cover forms receiving space with the holding seat;Circuit board, the circuit board is provided with detection element and the circuit with signal ground, and with the board surface on the thickness direction side at least partially covered by the cover at least partially set in the receiving space, wherein, still have: shielding component, the shielding component is integrally formed conductive component, and with the board surface on the other side of the thickness direction of the circuit board at least partially set in the receiving space in the mode of covering substantially entire;And first connecting piece, the first connecting piece is conductive component, and the shielding component is electrically connected with the signal ground.

[0006] According to the encoder of the utility model, there is shielding component and first connecting piece, shielding component is integrally formed conductive component, and with the board surface on the other side of the thickness direction of the circuit board at least partially set in the receiving space in the mode of covering entire, first connecting piece is conductive component, and the shielding component is electrically connected with the signal ground of circuit board, therefore, when the encoder is fixed to a motor via the holding seat to form a motor with the encoder, the influence of motor frame ground noise, electromagnetic noise and the like from the other side of the thickness direction of the circuit board on detection element can be inhibited by shielding component, and it is helpful to improve the anti-interference ability of detection element with simple structure.

[0007] In addition, in the encoder of the utility model, the shielding component is preferably a flat copper foil, and is separated parallel to the circuit board.

[0008] The encoder of the utility model has simple shielding component structure, is easy to manufacture and helps to inhibit manufacturing cost.

[0009] In addition, in the encoder of the utility model, preferably, a recess opening outward is arranged on the outer periphery of the shielding component, the retaining seat has an abutting surface for the shielding component to abut against and a protrusion protruding from the abutting surface towards the circuit substrate through the recess and abutting against the board surface on the other side of the thickness direction of the circuit substrate.

[0010] According to the encoder of the utility model, the cooperation of the recess and the protrusion can assist in the coarse positioning of the shielding component, thereby improving the assembly efficiency.

[0011] In addition, in the encoder of the utility model, preferably, a plurality of recesses are arranged at intervals on the outer periphery of the shielding component, and a plurality of protrusions are arranged correspondingly to the recesses.

[0012] According to the encoder of the utility model, by arranging a plurality of recesses and protrusions, the relative position of the shielding component relative to the retaining seat can be limited in multiple directions, and the coarse positioning of the shielding component is more convenient.

[0013] In addition, in the encoder of the utility model, preferably, a second connecting piece is further provided, the second connecting piece is a conductive component, and the cover is electrically connected to the signal ground.

[0014] According to the encoder of the utility model, the cover can be used to better inhibit the influence of noise from the one side of the thickness direction of the circuit substrate on the detection element, and further improve the anti-interference capability of the detection element.

[0015] In addition, in the encoder of the utility model, preferably, at least one of a first positioning piece and a second positioning piece is further provided, the first positioning piece is used for positioning the shielding component relative to the circuit substrate, and the second positioning piece is used for positioning the cover relative to the circuit substrate.

[0016] In addition, in the encoder of the utility model, preferably, at least one of the first connecting piece, the second connecting piece, the first positioning piece and the second positioning piece is a pin or a screw extending along the thickness direction of the circuit substrate and arranged near the outer periphery of the circuit substrate.

[0017] According to the encoder of the utility model, a general piece can be used as the first connecting piece, the second connecting piece, the first positioning piece and the second positioning piece, thereby inhibiting the manufacturing cost.

[0018] Further, in the encoder of the utility model, preferably the retaining seat has a through hole penetrating along the thickness direction of the circuit substrate, the through hole is blocked by the shielding member, the detection element is a magnetic sensitive element, a magnet is arranged in the through hole, the magnet is opposite to the detection element through the shielding member, and the magnet rotates integrally with the rotating shaft of the motor.

[0019] Further, in the encoder of the utility model, preferably the cover has a plate portion covering at least partially the plate surface of the thickness direction of the circuit substrate, and a cylinder portion extending from the periphery of the plate portion to the retaining seat.

[0020] Further, in order to achieve the above-mentioned purpose, the utility model provides a motor with encoder, which has the encoder of any one of the above-mentioned.

[0021] (utility model effect)

[0022] According to the utility model, the shielding member and the first connecting piece are provided, the shielding member is an integrally formed conductive member, and is arranged at least partially in the receiving space in a manner of covering the whole plate surface of the other side of the thickness direction of the circuit substrate, the first connecting piece is a conductive member, and electrically connects the shielding member and the signal ground of the circuit substrate, therefore, when the encoder is fixed to the motor through the retaining seat to form the motor with encoder, the influence of the motor frame ground noise, electromagnetic noise and the like from the other side of the thickness direction of the circuit substrate on the detection element can be inhibited by the shielding member, and the anti-interference ability of the detection element can be improved in a simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a perspective view of the motor with encoder according to the embodiment of the utility model.

[0024] Figure 2 is a perspective view of the encoder according to the embodiment of the utility model.

[0025] Figure 3 is a sectional view of the encoder according to the embodiment of the utility model.

[0026] Figure 4 is an exploded view of the encoder according to the embodiment of the utility model.

[0027] Figure 5 is a perspective view of the encoder according to the embodiment of the utility model in the state of the assembling process.

[0028] Figure 6 is another perspective view of the encoder according to the embodiment of the utility model in the state of the assembling process.

[0029] (Symbol explanation)

[0030] 1 encoder motor

[0031] 100 motor

[0032] 110 motor housing

[0033] 111 cylindrical portion

[0034] 112 end cover

[0035] 200 encoder

[0036] 210 holding seat

[0037] 211 cylindrical main body portion

[0038] 2110 through hole

[0039] 2111 abutting surface

[0040] 212 protrusion

[0041] 213 mounting portion

[0042] 220 cover

[0043] 221 plate portion

[0044] 222 cylindrical portion

[0045] 230 circuit substrate

[0046] 231 connector

[0047] 240 shielding member

[0048] 241 recess

[0049] 250 first connecting member

[0050] 260 second connecting member

[0051] 270 first positioning member

[0052] 280 second positioning member

[0053] 290 fixing member

[0054] S accommodation space DETAILED DESCRIPTION

[0055] Hereinafter, an encoder motor according to an embodiment of the present application will be described with reference to the accompanying drawings. Figures 1 to 6

[0056] ​Here, for convenience of explanation, three directions orthogonal to each other are assumed to be an X direction, a Y direction, and a Z direction, and one side in the X direction is assumed to be XI, the other side in the X direction is assumed to be X2, one side in the Y direction is assumed to be Yl, the other side in the Y direction is assumed to be Y2, one side in the Z direction is assumed to be Zl, and the other side in the Z direction is assumed to be Z2.

[0057] (Overall structure of belt encoder motor)

[0058] As shown in FIG. 1, a belt encoder motor 1 has a motor 100 and an encoder 200 assembled to the motor 100. Figure 1

[0059] Here, the encoder 200 is used to detect rotation of a rotation shaft of the motor 100.

[0060] (Structure of motor)

[0061] As shown in FIG. 2, the motor 100 has a motor case 110. Figure 1

[0062] Here, as shown in FIG. 3, the motor case 110 has an outer shape that is roughly a rectangular parallelepiped. Specifically, the motor case 110 has a cylindrical portion 111 that extends in the Z direction and has a cross section that is roughly a rectangle with one side parallel to the X direction, and an end cover 112 that plugs openings of both sides in the Z direction of the cylindrical portion 111. A through-hole that penetrates in the Z direction is provided in the end cover 112 on the Zl direction side. Figure 1

[0063] Further, although not shown, the motor 100 also has a stator and a rotor. The stator and the rotor are housed in the motor case 110. The stator has a stator core that is ring-shaped with an axis extending in the Z direction as a center, and a coil assembled to the stator core. The rotor opposes the stator at an interval on the radially inner side, for example, and has a rotation shaft that extends in the Z direction, and a magnet provided on the outer peripheral side of the rotation shaft. An end portion of the rotation shaft on the Zl direction side penetrates the through-hole in the end cover 112 on the Zl direction side.

[0064] (Structure of encoder)

[0065] As shown in FIG. 4, Figure 1 Figure 2 Figure 4 Figure 5 ​​​​​​As shown, the encoder 200 includes: a retainer 210; a cover 220 forming a storage space S between the cover 220 and the retainer 210; and a circuit board 230 having a detection element and a circuit having a signal ground, and being at least partially disposed in the storage space S such that the cover 220 at least partially covers the Z1 direction side (i.e., the thickness direction side) of the circuit board 230; and the encoder 200 also includes: a shielding member 240 being an integrally formed conductive member, and being at least partially disposed in the storage space S such that it covers approximately the entire Z2 direction side (i.e., the other thickness direction side) of the circuit board 230; and a first connector 250 being a conductive member, and electrically connecting the shielding member 240 to the aforementioned signal ground.

[0066] Here, as Figures 3 to 6 As shown, the retainer 210 has a through hole 2110 extending along the Z direction, which is blocked by the shielding member 240. Furthermore, the retainer 210 has: an abutment surface 2111 against which the shielding member 240 abuts; and a protrusion 212 that protrudes from the abutment surface 2111 through a recess 241 in the shielding member 240 toward the circuit board 230 and abuts against the Z2 direction side of the circuit board 230. Specifically, the retainer 210 has a cylindrical body portion 211 extending along the Z direction and generally cylindrical with its center aligned with the axis of rotation of the motor 100. A through hole 2110 extending along the Z direction is formed in the center of the cylindrical body portion 211. The Z1 direction side end face of the cylindrical body portion 211 forms the abutment surface 2111. Multiple protrusions 212 are spaced apart circumferentially around the center of the cylindrical main body 211. A mounting portion 213 protruding outwards is provided on the outer peripheral surface of the cylindrical main body 211. Multiple mounting portions 213 are spaced apart circumferentially around the center of the cylindrical main body 211. The retaining seat 210 is fixed to the end cap 112 on the Z1 direction side of the motor housing 110 by screws or the like that screwed into the mounting portion 213. A portion of the Y2 direction side of the cylindrical main body 211 is cut away to form a surface perpendicular to the Y direction.

[0067] In addition, such as Figures 2 to 6As shown, the cover 220 is assembled to the retainer 210 from the Z1 direction side, thereby covering at least a portion of the circuit board 230. Specifically, the cover 220 is made of metal, for example, and has: a plate portion 221 that at least partially covers the plate surface of the circuit board 230 on the Z1 direction side; and a cylindrical portion 222 that extends from the periphery of the plate portion 221 toward the shielding member 240 to abut against the retainer 210. A portion of the plate portion 221 and the cylindrical portion 222 on the Y2 direction side is cut off to form a notch, at which a portion of the circuit board 230 is exposed to the outside. When viewed along the Z direction, the edges of the plate portion 221 and the cylindrical portion 222 with the notches formed are straight lines extending parallel to the X direction, and the remaining edges are on a circle centered on the center of the cylindrical body portion 211.

[0068] In addition, such as Figures 2 to 6 As shown, a portion of the circuit board 230 is disposed within the storage space S formed between the cover 220 and the holder 210. A portion of the circuit board 230 in the Y2 direction is cut away to form a notch. When viewed along the Z direction, the edge of the circuit board 230 with the notch extends in a straight line parallel to the X direction, and the remaining edges lie on a circle centered on the center of the cylindrical body portion 211. In addition to forming a circuit with signal grounding, a connector 231 is also provided on the circuit board 230. This connector 231 is disposed on the portion of the circuit board 230 exposed from the notch in the plate portion 221 and the cylindrical portion 222, for connection of an external cable (not shown). The circuit board 230 is fixed to the holder 210, for example, by means of a fastener 290 such as a screw screwed into the protrusion 212.

[0069] In addition, such as Figures 2 to 6 As shown, the shielding member 240 is a flat copper foil and is separated from the circuit board 230 parallel to it. The shielding member 240 is manufactured, for example, by punching. A recess 241 with an opening towards the outer periphery is provided on the outer periphery of the shielding member 240. Multiple recesses 241 are provided on the outer periphery of the shielding member 240 corresponding to the protrusions 212. Similar to the cover 220 and the circuit board 230, a portion of the shielding member 240 in the Y2 direction is cut off to form a notch. When viewed along the Z direction, the edge of the shielding member 240 with the notch is a straight line extending parallel to the X direction, and the remaining edges are on a circle centered on the center of the cylindrical main body 211. The shielding member 240 is also fixed to the retaining seat 210, for example, by screws or other fasteners screwed into the abutment surface 2111.

[0070] In addition, such as Figures 2 to 6As shown, the encoder 200 has a second connector 260 in addition to the first connector 250, the second connector 260 is an electrically conductive member, and electrically connects the shield 220 and the signal ground. The encoder 200 also has a first positioning member 270 that positions the shield 240 relative to the circuit board 230, and a second positioning member 280 that positions the shield 220 relative to the circuit board 230. Specifically, the first connector 250 and the first positioning member 270 are inserted into a hole in the shield 240 and a hole in the circuit board 230 via the center of the cylindrical body portion 211, and similarly, the second connector 260 and the second positioning member 280 are inserted into a hole in the shield 220 (specifically, the plate portion 221) and a hole in the circuit board 230 via the center of the cylindrical body portion 211. The first connector 250 and the second connector 260 are adjacent to each other, and the first positioning member 270 and the second positioning member 280 are also adjacent to each other. The first connector 250, the second connector 260, the first positioning member 270, and the second positioning member 280 are pins that extend in the Z direction of the circuit board 230. The first connector 250, the second connector 260, the first positioning member 270, and the second positioning member 280 are disposed near the outer periphery of the circuit board 230.

[0071] Further, although not shown, the detection element is a magnetic sensitive element, and a magnet is provided in the through hole 2110, the magnet is opposite to the detection element via the shield 240, and rotates integrally with the rotating shaft of the motor 100.

[0072] (Main effects of the present embodiment)

[0073] According to the encoder-equipped motor 1 of the present embodiment, the shield 240 is an integrally formed electrically conductive member, and is disposed at least partially in the housing space S in a manner that covers the entire surface of the other side of the thickness direction of the circuit board 230, and the first connector 250 is an electrically conductive member that electrically connects the shield 240 and the signal ground of the circuit board 230, so that when the encoder 200 is fixed to the motor 100 via the holder 210 to constitute an encoder-equipped motor, the influence of motor frame ground noise, electromagnetic noise, and the like from the other side of the thickness direction of the circuit board 230 on the detection element can be suppressed by the shield 240, and the anti-interference ability of the detection element can be improved with a simple structure.

[0074] Further, according to the encoder-equipped motor 1 of the present embodiment, the shield 240 is a flat copper foil that is separated in parallel with the circuit board 230, so that the shield 240 is simple in structure and easy to manufacture, and the manufacturing cost can be suppressed.

[0075] The utility model has been described above in connection with the drawings, and obviously, the specific implementation of the utility model is not limited by the above-mentioned embodiments.

[0076] For example, in the above-described embodiments, the encoder 200 is installed to the motor 100, but is not limited thereto, and the encoder 200 can be installed to other devices.

[0077] Further, in the above-described embodiments, the shielding member 240 is a flat copper foil, and is separated in parallel with the circuit substrate 230, but is not limited thereto, and the shielding member 240 can not be flat, can be other metal, and can partially contact the circuit substrate 230.

[0078] Further, in the above-described embodiments, the recess 241 opening toward the outer circumferential side is provided at the outer periphery of the shielding member 240, but is not limited thereto, and a through hole can be provided instead of the recess 241, and according to the situation, the recess or the through hole can not be provided.

[0079] Further, in the above-described embodiments, the first connecting member 250, the second connecting member 260, the first positioning member 270, and the second positioning member 280 are pins, but are not limited thereto, and can be screws, and can be other members.

[0080] Further, in the above-described embodiments, the first connecting member 250, the second connecting member 260, the first positioning member 270, and the second positioning member 280 are provided near the outer periphery of the circuit substrate 230, but are not limited thereto, and can be provided at other positions.

[0081] Further, in the above-described embodiments, the specific shapes of the holding seat 210, the cover 220, and the circuit substrate 230 are not limited to the illustrated shapes, and can be appropriately formed as needed.

[0082] It should be understood that, within the scope of the utility model, each part in the embodiments can be freely combined, or each part in the embodiments can be appropriately deformed or omitted.

Claims

1. An encoder having: a holder; a cover that forms an accommodation space with the holder; and a circuit board provided with a detection element and a circuit having a signal ground, and at least partially disposed in the accommodation space with a board face on a thickness direction side at least partially covered by the cover, characterized in that, Further comprising: a shielding member that is an electrically conductive member integrally formed and disposed at least partially in the housing space so as to cover the entire surface of the other side in the thickness direction of the circuit board; and a first connecting member that is an electrically conductive member and electrically connects the shielding member and the signal ground.

2. The encoder according to claim 1, wherein the shielding member is a copper foil in a flat plate shape and is separated in parallel with the circuit board.

3. The encoder according to claim 1, wherein a recess that opens toward the outer periphery side is provided at the outer periphery of the shielding member, the holding seat has: an abutting surface for the shielding member to abut against; and a protrusion that protrudes from the abutting surface toward the circuit board via the recess and abuts against the surface of the other side in the thickness direction of the circuit board.

4. The encoder according to claim 3, wherein a plurality of the recesses are provided at intervals at the outer periphery of the shielding member, a plurality of the protrusions are provided corresponding to the recesses.

5. The encoder according to claim 1, further comprising: a second connecting member that is an electrically conductive member and electrically connects the cover and the signal ground.

6. The encoder according to claim 5, further comprising: at least one of a first positioning member and a second positioning member, the first positioning member positions the shielding member with respect to the circuit board, the second positioning member positions the cover with respect to the circuit board.

7. The encoder according to claim 6, wherein at least one of the first connecting member, the second connecting member, the first positioning member, and the second positioning member is a pin or a screw that extends in the thickness direction of the circuit board and is disposed near the outer periphery of the circuit board.

8. The encoder according to claim 1, wherein the holding seat has a through-hole that penetrates in the thickness direction of the circuit board, the through-hole is plugged by the shielding member, the detection element is a magnetic sensitive element, a magnet is provided in the through-hole, opposes the detection element through the shielding member, and rotates integrally with the rotational shaft of the motor.

9. The encoder according to claim 1, wherein the cover has: a plate portion that at least partially covers the surface of one side in the thickness direction of the circuit board; and a cylindrical portion that extends from the periphery of the plate portion toward the shielding member so as to abut against the holding seat. An encoder according to any one of claims 1 to 9.

10. A belt encoder motor characterized by, ​

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