WO2020022244A1 - Motor - Google Patents

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Publication number
WO2020022244A1
WO2020022244A1 PCT/JP2019/028588 JP2019028588W WO2020022244A1 WO 2020022244 A1 WO2020022244 A1 WO 2020022244A1 JP 2019028588 W JP2019028588 W JP 2019028588W WO 2020022244 A1 WO2020022244 A1 WO 2020022244A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
rotating body
shaft
light emitting
light receiving
Prior art date
Application number
PCT/JP2019/028588
Other languages
French (fr)
Japanese (ja)
Inventor
吉和 坂
利典 後藤
鈴木　毅
保幸 竹本
Original Assignee
ミネベアミツミ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Priority to DE112019003759.5T priority Critical patent/DE112019003759T5/en
Publication of WO2020022244A1 publication Critical patent/WO2020022244A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/10—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using light effect devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/22—Optical devices

Definitions

  • the present invention relates to a motor.
  • a motor unit Conventionally, a motor unit, a shaft holding unit, and a flange, the motor unit, the motor magnet, the drive coil, the upper yoke and lower yoke for forming a gap G in the axial direction, and the position of the rotating motor magnet.
  • a motor including three Hall elements installed in a circumferential direction for detecting and sequentially obtaining a current switching signal to a drive coil (see Patent Document 1).
  • a plurality of magnetic sensors detect a magnetic flux that changes with the rotation of the rotor, and calculates the rotation angle of the rotor based on the detection result.
  • a Hall element is used to detect the position of the rotating body (polyhedral mirror) in the circumferential direction.
  • the Hall element is synchronized with the position of the rotating body in the circumferential direction. It was difficult to output a signal.
  • the present invention exemplifies the above-described problem as an example, and an object of the present invention is to provide a motor that can accurately detect a rotation angle.
  • a motor includes a shaft, a rotating body supported by the shaft, a circuit board having a surface facing the rotating body in a longitudinal direction of the shaft, and A light-emitting unit provided on the surface of the board, and a light-receiving unit provided on the surface of the circuit board, the light-emitting unit and the light-receiving unit are arranged apart from each other in a radial direction.
  • a projection is provided on a surface of the rotating body, and the projection passes between the light emitting unit and the light receiving unit as the shaft rotates.
  • the shape of the protruding portion is cylindrical, and a through hole is formed in an outer peripheral surface of the protruding portion.
  • the shape of the protruding portion is cylindrical, and a plurality of through holes are formed on the outer peripheral surface of the protruding portion at predetermined intervals in the circumferential direction.
  • a motor includes a housing having a base portion extending in a radial direction, and the circuit board is supported by the base portion.
  • a motor includes a stator, wherein the circuit board is disposed between the rotating body and the stator in a longitudinal direction of the shaft.
  • the motor according to one aspect of the present invention includes a bearing, and the bearing is disposed radially inside the rotating body.
  • the shape of the protrusion is a column.
  • a motor includes a shaft, a rotating body supported by the shaft, a circuit board having a surface facing the rotating body in a longitudinal direction of the shaft, and A light-emitting unit provided on the surface of the substrate, and a light-receiving unit provided on the surface of the circuit board, and a protrusion is provided on the surface of the rotating body in the longitudinal direction of the shaft,
  • the light emitting section and the light receiving section are disposed so as to face an outer peripheral surface of the projecting section, and the outer peripheral surface of the projecting section reflects light emitted from the light emitting section to the light receiving section. It is characterized by having a reflecting surface to make it.
  • the rotation angle can be accurately detected.
  • FIG. 1 is a perspective view schematically showing a configuration of a motor according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view along the line AA in FIG. 1 schematically illustrating a configuration of the motor according to the first embodiment of the present invention. It is a perspective view showing roughly composition of a rotating body of a motor concerning a 1st embodiment of the present invention.
  • FIG. 2 is a perspective view showing a state in which a circuit board and a housing of the motor according to the first embodiment of the present invention are separated.
  • FIG. 3 is a perspective view showing a circuit board and a housing of the motor according to the first embodiment of the present invention in an assembled state.
  • FIG. 6A is a diagram showing a modification of the rotating body of the motor according to the first embodiment of the present invention
  • FIG. 6A is a perspective view showing a first modified example of the rotating body.
  • (B) is a perspective view showing a second modification of the rotating body. It is a perspective view showing roughly composition of a rotating body of a motor concerning a 2nd embodiment of the present invention. It is a perspective view showing roughly composition of a circuit board and a housing of a motor concerning a 2nd embodiment of the present invention.
  • FIG. 1 is a perspective view schematically showing a configuration of a motor 1 according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along a line AA in FIG.
  • the direction of arrow a in the direction of the axis x is defined as the upper side a
  • the direction of arrow b is defined as the lower side b.
  • a direction perpendicular to the axis x hereinafter, also referred to as a “radial direction”
  • a direction away from the axis x is defined as an outer peripheral side c
  • a direction toward the axis x (FIG. 1).
  • a circumferential direction around the axis x (the direction of arrow e in FIG. 1) is defined as a circumferential direction e.
  • a motor 1 As shown in FIG. 1, a motor 1 according to a first embodiment of the present invention includes a shaft 2 that rotates counterclockwise around an axis x, a rotating body 3 supported by the shaft 2, and a rotating body 3.
  • a circuit board 4 (see FIG. 2) having a surface 4a opposed to the light emitting device 3; a light emitting unit 5 (see FIG. 2) provided on the surface 4a of the circuit board 4 to emit light; And a light receiving unit 6 (see FIG. 2) for receiving the light emitted from the light emitting unit 5.
  • the motor 1 has a housing 7 that houses the rotating body 3 and the circuit board 4 therein, and a stator 9 that surrounds the shaft 2.
  • the shaft 2 has an end 2a disposed on an upper side a in a longitudinal direction (hereinafter, referred to as an axis x direction) and an end 2b disposed on a lower side b in the axis x direction. Rotate counterclockwise around.
  • the upper part a of the shaft 2 projects upward from a hole 31 of the rotating body 3 described later.
  • FIG. 3 is a perspective view schematically showing a configuration of the rotating body 3 of the motor 1.
  • the rotating body 3 has a bottom part 30 a and a cylindrical part 30 b, and an upper surface 3 a on the upper side a in the axis x direction and a surface 3 b facing the surface 4 a of the circuit board 4.
  • An end surface 3e disposed on the circuit board 4 side, an outer peripheral surface 3c between the upper surface 3a and the end surface 3e and on the outer peripheral side c in the axis x direction, and between the upper surface 3a and the end surface 3e.
  • an inner peripheral surface 3d on the inner peripheral side d in the direction of the axis x The rotating body 3 rotates counterclockwise about the axis x with the rotation of the shaft 2 without contacting the circuit board 4.
  • a hole 31 is formed in the upper surface 3a of the rotating body 3 so that a portion of the upper side a in the axis x direction of the shaft 2 is inserted.
  • the hole 31 has a cylindrical shape protruding upward in the axis x direction.
  • a projection 32 is provided on the surface 3b of the rotating body 3 in the direction of the axis x.
  • the shape of the protruding portion 32 is cylindrical with the axis x as the center, and protrudes from the surface 3b toward the circuit board 4 (see FIG. 2). Further, the protruding portion 32 is disposed on the inner peripheral side d of the inner peripheral surface 3 d of the rotating body 3.
  • the end surface 32a of the protruding portion 32 on the circuit board 4 side is arranged so as to be separated from the surface 4a of the circuit board 4 by a predetermined distance (see FIG. 2).
  • the protruding portion 32 is disposed on the lower side b in the direction of the axis x, and has a cylindrical lower portion 33 that passes between the light emitting portion 5 and the light receiving portion 6 (see FIG. 2) as the shaft 2 rotates. , And a cylindrical upper part 34 disposed on the upper side a of the lower part 33.
  • the lower portion 33 and the upper portion 34 are a part of the protruding portion 32 but are actually arranged integrally.
  • the lower portion 33 of the protruding portion 32 has a tip 5 a of the light emitting portion 5 (see FIG. 2) and a tip of the light receiving portion 6 when the end face 32 a of the protruding portion 32 is arranged to face the circuit board 4. 6a (see FIG. 2) to the end face 32a.
  • the lower part 33 of the protruding part 32 is arranged so as to be spaced from the light emitting part 5 and the light receiving part 6 by a predetermined distance.
  • the upper portion 34 of the protruding portion 32 has a tip 5a of the light emitting portion 5 (see FIG. 2) and a tip 6a of the light receiving portion 6 in a state where the end surface 32a of the protruding portion 32 is arranged so as to face the circuit board 4. (See FIG. 2) from the position facing to the surface 3b of the rotating body 3.
  • a rectangular through hole 35 through which light emitted from the light emitting unit 5 passes is formed in the outer circumferential surface 32 c on the outer circumferential side c of the protrusion 32 in the circumferential direction e.
  • the through hole 35 penetrates from the outer peripheral surface 32c on the outer peripheral side c of the protruding portion 32 to the inner peripheral surface 32d on the inner peripheral side d. Further, a plurality of through holes 35 (four in the first embodiment of the present invention) are formed on the outer peripheral surface 32c of the protruding portion 32 at equal intervals.
  • the through-hole 35 is formed in the lower part 33 and the upper part 34 of the protruding part 32
  • at least a part of the through-hole 35 is formed in the lower part 33 of the protruding part 32. It may be formed only on the lower portion 33 of the protrusion 32 as long as it is formed.
  • FIG. 4 is a perspective view showing the circuit board 4 and the housing 7 of the motor 1 in a separated state.
  • FIG. 5 is a perspective view showing a state in which the circuit board 4 and the housing 7 of the motor 1 are assembled.
  • the circuit board 4 extends in the radial direction, and has a surface 4 a on the rotating body 3 side, a surface 4 b on the stator 9 side facing the stator 9, and a surface 4 a. 4b and a pair of side surfaces 4c and a pair of side surfaces 4d on the outer peripheral side c.
  • the pair of side surfaces 4c extend in the radial direction.
  • the pair of side surfaces 4d faces in a direction substantially perpendicular to the pair of side surfaces 4c.
  • the circuit board 4 is disposed between the rotating body 3 and the stator 9 in the axis x direction of the shaft 2 (see FIG. 2).
  • a light emitting unit 5 and a light receiving unit 6 are provided on the surface 4 a of the circuit board 4.
  • the light emitting unit 5 and the light receiving unit 6 are arranged apart from each other in the radial direction. Specifically, the light emitting unit 5 is arranged on the outer peripheral side c, and the light receiving unit 6 is arranged on the inner peripheral side d.
  • the light emitting unit 5 and the light receiving unit 6 are optical sensors, and the light emitting unit 5 is a light source such as an infrared LED (Light Emitting @Diode) or a semiconductor laser.
  • the light receiving unit 6 is a photodiode, a phototransistor, or the like.
  • the circuit board 4 has a hole 41 into which a boss 77 of the housing 7 described later is inserted, an edge 42 which is an edge of the hole 41, the shaft 2 and the housing 7 described later. And a hole 43 into which the hole 79 is inserted.
  • a plurality of holes 41 are formed in the circuit board 4.
  • the holes 41 are formed near the pair of side surfaces 4c, respectively, and penetrate from the surface 4a of the circuit board 4 to the surface 4b of the circuit board 4.
  • the circuit board 4 is disposed between the rotating body 3 and the stator 9 in the longitudinal direction (the axis x direction) of the shaft 2 (see FIG. 2). ).
  • the edge 42 protrudes from the side surface 4c to the outer peripheral side c.
  • the edge 42 comes into contact with an edge 78 of the housing 7 when a boss 77 of the housing 7 described later is inserted into the hole 41.
  • the hole 43 is formed at the center or substantially the center of the circuit board 4, and penetrates from the surface 4 a of the circuit board 4 to the surface 4 b of the circuit board 4.
  • the housing 7 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 3, and the housing 7 is disposed on the lower side b in the axis x direction and accommodates the stator 9. And a lower housing 72.
  • the upper housing 71 has an end surface 71 a arranged on the upper side a in the direction of the axis x, and a lower surface arranged on the lower side b of the end surface 71 a in a disk shape or a substantially disk shape centered on the axis x. 71b and an outer peripheral surface 71c between the end surface 71a and the lower surface 71b and on the outer peripheral side c in the axis x direction.
  • the outer peripheral surface 71c is arranged on the outer peripheral side c of the outer peripheral surface 3c of the rotating body 3.
  • the lower surface 71b of the upper housing 71 is disposed on the upper side a in the axis x direction and faces the rotating body 3 and the bottom surface 73 on the rotating body 3 side, and is disposed on the lower side b in the axis x direction and faces the circuit board 4. And a bottom surface 74 on the circuit board 4 side.
  • a hole 75 for exposing the light emitting unit 5 and the light receiving unit 6 is formed in the lower surface 71b of the upper housing 71.
  • the hole 75 allows the light emitting unit 5 and the light receiving unit 6 disposed on the surface 4a of the circuit board 4 to be inserted from the lower side b in the axis x direction to the upper side a when the circuit board 4 is fixed to the upper housing 71. Is formed. Specifically, the hole 75 penetrates from the bottom surface 73 on the rotating body 3 side to the bottom surface 74 on the circuit board 4 side.
  • the bottom surface 74 on the circuit board 4 side has a base portion 76 extending in the radial direction, a columnar or substantially columnar boss 77, and an edge portion that contacts the edge portion 42 of the circuit board 4. 78, and a hole portion 79 in which a cylindrical or substantially cylindrical insertion hole 79h into which the shaft 2 is inserted is formed.
  • the base portion 76 has claws 80a and 80b at both ends in the radial direction for locking the pair of side surfaces 4d of the circuit board 4.
  • the boss 77 projects from the bottom surface 74 on the circuit board 4 side to the lower side b in the axis x direction.
  • the hole 79 extends from the bottom surface 74 on the circuit board 4 side to the lower side b in the axis x direction, and is inserted into the hole 43 of the circuit board 4 when the circuit board 4 is supported by the base 76. .
  • the upper housing 71 and the lower housing 72 are connected by inserting a projection 7 a formed on the outer peripheral side c of the upper housing 71 into a hole 7 b formed on the lower housing 72. .
  • a rotor 8 including the shaft 2 and a stator 9 surrounding the rotor 8 are housed inside the upper housing 71 and the lower housing 72. Further, inside the housing 7, a bearing 81a that rotatably supports an upper part a in the axis x direction of the shaft 2 and a bearing 81b that rotatably supports a lower part b in the axis x direction of the shaft 2 are provided. Have.
  • the bearing 81a and the bearing 81b are arranged inside the rotating body 3 in the radial direction. Specifically, the bearing 81 a and the bearing 81 b are arranged on the lower side b of the upper surface 3 a of the rotating body 3 and on the inner peripheral side d of the protrusion 32 of the rotating body 3.
  • the rotor 8 has the shaft 2, an annular core 83 surrounding the shaft 2, and an annular magnet 84 surrounding the outer circumferential surface c of the core 83.
  • the upper part a of the shaft 2 is inserted into the hole 31.
  • a bush 82 is attached between a surface on the outer peripheral side c of the shaft 2 and a surface on the inner peripheral side d of the hole 31.
  • the stator 9 includes a stator core 91 formed in an annular shape so as to surround the rotor 8, a coil 92 wound around an extension (not shown) extending from the stator core 91 to the inner peripheral side d, and a stator core 91. And an insulator (not shown) for insulating the coil 92 from the coil 92.
  • the lower portion 33 of the protrusion 32 passes between the light emitting unit 5 and the light receiving unit 6 without contacting the light emitting unit 5 and the light receiving unit 6.
  • the through hole 35 formed in the protruding portion 32 passes between the light emitting section 5 and the light receiving section 6 with the rotation of the rotating body 3, the presence or absence of light reception from the light emitting section 5 by the light receiving section 6 is determined. Occurs. That is, when the through hole 35 passes between the light emitting unit 5 and the light receiving unit 6, the light receiving unit 6 receives the light from the light emitting unit 5.
  • the protrusion 32 of the rotating body 3 passes between the light emitting unit 5 and the light receiving unit 6, and the rotation position of the shaft 2 is determined by the light receiving timing of the light from the light emitting unit 5 received by the light receiving unit 6. Has been detected. Therefore, as compared with the case where the rotational position is detected by detecting the magnetic flux that changes with the rotation of the shaft 2, the change in the environmental temperature is not affected by the detection accuracy of the rotation angle, and the rotation angle is detected with high accuracy. be able to.
  • the circuit board 4 on which the light emitting unit 5 and the light receiving unit 6 are provided is supported by the base 76 of the housing 7, the light emitting unit 5 and the light receiving unit 6 can be arranged horizontally in the radial direction.
  • the circuit board 4 since the circuit board 4 is supported by the base 76 by inserting the boss 77 of the base 76 into the hole 41 of the circuit board 4, the circuit board 4 can be easily arranged horizontally.
  • the claws 80a and 80b for locking the pair of side surfaces 4c of the circuit board 4 are provided, it is possible to maintain a state in which the circuit board 4 is horizontally arranged in the radial direction of the rotating body 3.
  • circuit board 4 provided with the light emitting unit 5 and the light receiving unit 6 is disposed between the rotating body 3 and the stator 9 in the direction of the axis x, it is easy to adjust the phases of the shaft 2 and the rotating body 3. can do.
  • the bearing 81 a and the bearing 81 b are arranged on the lower side b in the axis x direction from the upper surface 3 a of the rotating body 3 and on the inner peripheral side d of the protrusion 32 of the rotating body 3. For this reason, the height of the motor 1 in the direction of the axis x can be reduced, and the overall size can be reduced.
  • the light receiving unit 6 can detect the rotation speed and the rotation speed of the shaft 2 based on the light receiving timing of the light from the light emitting unit 5.
  • FIG. 6 is a diagram showing a modification of the rotating body 3 of the motor 1
  • FIG. 6A is a perspective view of a rotating body 103 a showing a first modification of the motor 1.
  • FIG. 6B is a perspective view of a rotating body 103b showing a second modified example of the motor 1.
  • the same or similar components as those of the motor 1 according to the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • the rotating body 103a has a protruding portion 132a that protrudes from the surface 3b facing the surface 4a of the circuit board 4 toward the circuit board 4 (see FIG. 2).
  • the protrusion 132a has a columnar shape.
  • the protruding portion 132a is arranged on the inner peripheral side d of the inner peripheral surface 3d of the rotating body 3.
  • a plurality (four in the first modification) of the protruding portions 132a are arranged at equal intervals in the circumferential direction e around the axis x. That is, the plurality of protrusions 132a are arranged at equal angles (90 degrees in the first modification example) about the axis x.
  • the protruding portion 132a is disposed on the lower side b in the direction of the axis x, and a lower portion 133a that passes between the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) as the shaft 2 rotates,
  • An upper part 134a is disposed on the upper part a in the direction of the axis x of the lower part 133a.
  • the lower portion 133a and the upper portion 134a are part of the protruding portion 132a, but are actually arranged integrally.
  • the lower portion 133a of the protruding portion 132a has a tip 5a of the light emitting portion 5 (see FIG. 2) and a tip of the light receiving portion 6 in a state where the end surface 130a of the protruding portion 132a is arranged so as to face the circuit board 4. 6a (see FIG. 2) to the end face 130a.
  • the lower portion 133a of the protruding portion 132a is arranged so as to be separated from the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) by a predetermined distance.
  • the upper portion 134a of the protruding portion 132a has the tip 5a of the light emitting portion 5 (see FIG. 2) and the light receiving portion 6 (see FIG. 2) when the end surface 130a of the protruding portion 132a is arranged so as to face the circuit board 4. 2) from the position facing the tip 6a to the surface 3b of the rotating body 103a.
  • the lower portion 133a of the protrusion 132a does not contact the light emitting unit 5 and the light receiving unit 6 (see FIG. 2), and the light emitting unit 5 and the light receiving unit 6 do not contact each other. Pass between. At this time, the presence or absence of light reception from the light emitting unit 5 by the light receiving unit 6 occurs. That is, the light receiving unit 6 receives the light from the light emitting unit 5 in a state where the protrusion 132a does not pass between the light emitting unit 5 and the light receiving unit 6.
  • the light from the light emitting unit 5 is blocked, so that the light receiving unit 6 can receive the light from the light emitting unit 5. Can not.
  • the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
  • the case where a plurality of protrusions 132a are arranged on the rotating body 103a has been described, but only one protrusion 132a may be arranged on the rotating body 103a.
  • the protruding portion 132a has a cylindrical shape has been described, but may be a quadrangular prism shape, a triangular prism shape, a cylindrical shape, or the like.
  • the rotating body 103b has a protruding portion 132b protruding from the surface 3b facing the surface 4a of the circuit board 4 toward the circuit board 4 (see FIG. 2).
  • the shape of the protruding portion 132b is cylindrical with the axis x as the center.
  • the protruding portion 132b is arranged on the inner peripheral side d of the inner peripheral surface 3d of the rotating body 3.
  • a notch 135b is formed in the protruding portion 132b so as to cut out from the end surface 130b toward the surface 3b.
  • a plurality of cutouts 135b (four in the first modification example) are formed at equal intervals around the axis x.
  • the protruding portion 132b is disposed on the lower side b in the direction of the axis x, and a lower portion 133b that passes between the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) as the shaft 2 rotates,
  • An upper portion 134b is disposed on the upper portion a in the axis x direction of the lower portion 133b.
  • the lower part 133b and the upper part 134b are part of the protruding part 132b, but are actually arranged integrally.
  • the lower portion 133b of the protruding portion 132b has a tip 5a (see FIG. 2) of the light emitting portion 5 and a tip of the light receiving portion 6 in a state where the end surface 130b of the protruding portion 132b is arranged to face the circuit board 4. 6a (see FIG. 2) to the end face 130b.
  • the lower portion 133b of the protruding portion 132b is arranged so as to be separated from the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) by a predetermined distance.
  • the lower portion 133b of the protrusion 132b moves between the light emitting unit 5 and the light receiving unit 6 without contact with the light emitting unit 5 and the light receiving unit 6 as the shaft 2 rotates. pass.
  • the upper portion 134b of the protruding portion 132b has the tip 5a of the light emitting portion 5 (see FIG. 2) and the light receiving portion 6 (see FIG. 2) when the end surface 130b of the protruding portion 132b is arranged to face the circuit board 4. 2) from the position facing the tip 6a to the surface 3b of the rotating body 103b.
  • the rotating body 103b rotates with the rotation of the shaft 2, the lower portion 133b of the protrusion 132b does not contact the light emitting unit 5 (see FIG. 2) and the light receiving unit 6 (see FIG. 2). 5 and between the light receiving unit 6.
  • the notch 135b formed in the protruding portion 132b passes between the light emitting unit 5 and the light receiving unit 6 with the rotation of the rotating body 103b, so that the light receiving unit 6 determines whether or not light is received from the light emitting unit 5. Occurs. That is, when the notch 135b passes between the light emitting unit 5 and the light receiving unit 6, the light receiving unit 6 receives the light from the light emitting unit 5.
  • FIG. 7 is a perspective view schematically showing a configuration of a rotating body 203 of the motor according to the second embodiment of the present invention.
  • FIG. 8 is a perspective view schematically showing the configuration of the circuit board 4 and the housing 207 of the motor according to the second embodiment of the present invention.
  • the same or similar components as those of the motor 1 according to the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • the rotating body 203 has a protruding portion 232 protruding from the surface 3 b facing the surface 4 a of the circuit board 4 toward the circuit board 4.
  • the shape of the protruding portion 232 is cylindrical with the axis x as the center.
  • the protruding portion 232 is arranged on the inner peripheral side d of the inner peripheral surface 3 d of the rotating body 203.
  • the protruding portion 232 is disposed on the lower side b in the direction of the axis x, and passes through the inner peripheral side d of a light emitting unit 205 and a light receiving unit 206 (see FIG. 8) described later as the shaft 2 rotates. And a cylindrical upper part 234 arranged on the upper side a of the lower part 233.
  • the lower part 233 and the upper part 234 are part of the protruding part 232, but are actually arranged integrally.
  • the lower portion 233 of the protrusion 232 has a tip 205 a of the light emitting unit 205 (see FIG. 8) and a tip of the light receiving unit 206 when the end surface 230 of the protrusion 232 is arranged to face the circuit board 4.
  • the lower portion 233 of the protruding portion 232 is arranged so as to be separated from the light emitting unit 205 and the light receiving unit 206 by a predetermined distance.
  • the upper portion 234 of the protrusion 232 has a tip 205 a of the light emitting unit 205 (see FIG. 8) and a tip 206 a of the light receiving unit 6 when the end surface 230 of the protrusion 232 is arranged to face the circuit board 4. (See FIG. 8) is a portion from the opposing position to the surface 3b of the rotating body 3.
  • the outer peripheral surface 32c on the outer peripheral side c of the protrusion 232 has a rectangular reflecting surface 235 that reflects the light emitted from the light emitting unit 205.
  • a plurality of reflecting surfaces 235 are arranged at equal intervals.
  • a light emitting unit 205 and a light receiving unit 206 are provided on a surface 4a of the circuit board 4 (see FIG. 2).
  • the light emitting unit 205 and the light receiving unit 206 are arranged to face the outer peripheral surface 32c of the protrusion 232 along the radial direction.
  • the housing 207 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 203.
  • the housing 207 is disposed on the lower side b in the axis x direction and accommodates the stator 9 (see FIG. 2).
  • a side housing 72 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 203.
  • the housing 207 is disposed on the lower side b in the axis x direction and accommodates the stator 9 (see FIG. 2).
  • a side housing 72 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 203.
  • the housing 207 is disposed on the lower side b in the axis x direction and accommodates the stator 9 (see FIG. 2).
  • a side housing 72 is disposed on the lower side b in the axis x direction and accommodates the stator 9 (
  • the lower surface 271b of the upper housing 271 is disposed on the upper side a in the direction of the axis x and is opposed to the rotary body 203. And the bottom surface 274 on the circuit board 4 side opposite to the bottom surface 274.
  • a hole 275 exposing the light emitting unit 205 and the light receiving unit 206 is formed in the lower surface 271b of the upper housing 271.
  • the circuit board 4 (see FIG. 4) is fixed to the upper housing 271, the light emitting unit 205 and the light receiving unit 206 arranged on the surface 4 a of the circuit board 4 move upward from the lower side b in the axis x direction. a.
  • the hole 275 penetrates from the bottom surface 273 on the rotating body 3 side to the bottom surface 274 on the circuit board 4 side.
  • the lower portion 233 of the protrusion 232 rotates on the inner peripheral side d of the light emitting unit 205 and the light receiving unit 206 without contacting the light emitting unit 205 and the light receiving unit 206.
  • the light receiving unit 206 determines whether or not light is received from the light emitting unit 205. . That is, when the reflection surface 235 faces the light emitting unit 205 and the light receiving unit 206, the light receiving unit 206 receives the light from the light emitting unit 205.
  • the light receiving unit 206 cannot receive light from the light emitting unit 205.
  • the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
  • the protruding portion 232 of the rotating body 203 passes through the inner peripheral side d of the light emitting unit 205 and the light receiving unit 206, and the shaft 2 ( 2) is detected. Therefore, as compared with the case where the rotational position is detected by detecting the magnetic flux that changes with the rotation of the shaft 2, the change in the environmental temperature is not affected by the detection accuracy of the rotation angle, and the rotation angle is detected with high accuracy. be able to.
  • the reflecting surface 235 is disposed on the outer peripheral surface 32c of the protruding portion 232.
  • the outer peripheral surface 32c of the protruding portion 232 is a reflective surface, and may have a non-reflective surface that does not reflect light from the light emitting portion 205 to the light receiving portion 206.
  • the present invention is not limited to the motor 1 according to the embodiment of the present invention, but includes all aspects included in the concept of the present invention and the claims. .
  • the components may be appropriately selectively combined so as to achieve at least a part of the above-described problems and effects.
  • the shapes, materials, arrangements, sizes, and the like of the respective constituent elements in the above-described embodiment can be appropriately changed depending on the specific use mode of the present invention.
  • the shapes of the rotating bodies 3 and 203 according to the first and second embodiments of the present invention are such that the protruding portions 32 and 232 of the rotating bodies 3 and 203 include the light emitting units 5 and 205 and the light receiving unit. 6 and 206, the shape can be changed as appropriate as long as it has a shape in which the presence or absence of light from the light emitting unit 205 of the light receiving unit 206 occurs.
  • SYMBOLS 1 Motor, 2 ... Shaft, 2a, 2b ... End part, 3 ... Rotating body, 3a ... Upper surface, 3b ... Surface, 3c ... Outer peripheral surface, 3d ... Inner peripheral surface, 3e ... End surface, 4 ... Circuit board, 4a ... Surface on the rotating body side, 4b ... surface on the stator side, 4c, 4d ... side surface, 5 ... light emitting section, 5a ... tip, 6 ... light receiving section, 6a ... tip, 7 ... housing, 7a ... projection, 7b ... hole, 8 ...

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)

Abstract

The present invention provides a motor which is capable of detecting an angle of rotation with high accuracy. A motor (1) according to the present invention is provided with: a shaft (2); a rotary body (3) which is supported by the shaft (2); a circuit board (4) which has a surface that faces the rotary body (3) in the longitudinal direction of the shaft (2); a light emitting part (5) which is provided on the surface of the circuit board (4); and a light receiving part (6) which is provided on the surface of the circuit board (4). This motor is configured such that: the light emitting part (5) and the light receiving part (6) are arranged at a distance from each other in the radial direction; the surface of the rotary body (3) is provided with a projection (32) in the longitudinal direction of the shaft (2); and the projection (32) passes through the space between the light emitting part (5) and the light receiving part (6) as the shaft (2) rotates.

Description

モータmotor
　本発明は、モータに関する。 The present invention relates to a motor.
　従来、モータ部、軸保持部及びフランジとから構成され、モータ部はモータ用マグネット、駆動コイル、軸方向にギャップＧを形成するための上ヨークと下ヨーク、及び回転するモータ用マグネットの位置を検出して駆動コイルへの電流切り替え用信号を順次得るために周方向に設置された３個のホール素子とから構成されているモータが知られている（特許文献１参照）。 Conventionally, a motor unit, a shaft holding unit, and a flange, the motor unit, the motor magnet, the drive coil, the upper yoke and lower yoke for forming a gap G in the axial direction, and the position of the rotating motor magnet. 2. Description of the Related Art There is known a motor including three Hall elements installed in a circumferential direction for detecting and sequentially obtaining a current switching signal to a drive coil (see Patent Document 1).
　このモータ装置では、複数の磁気センサによりロータの回転に伴って変化する磁束を検出し、この検出結果に基づいてロータの回転角を算出している。 In this motor device, a plurality of magnetic sensors detect a magnetic flux that changes with the rotation of the rotor, and calculates the rotation angle of the rotor based on the detection result.
特開昭６０－８２０５６号公報JP-A-60-82056
　例えば、特許文献１に開示されるモータでは、周方向における回転体（多面鏡）の位置を検出するためにホール素子を用いていたが、周方向における回転体の位置と同期させてホール素子から信号を出力することが難しかった。 For example, in the motor disclosed in Patent Document 1, a Hall element is used to detect the position of the rotating body (polyhedral mirror) in the circumferential direction. However, the Hall element is synchronized with the position of the rotating body in the circumferential direction. It was difficult to output a signal.
　本発明は、上述の課題を一例とするものであり、回転角度を精度良く検出することができるモータを提供することを目的とする。 The present invention exemplifies the above-described problem as an example, and an object of the present invention is to provide a motor that can accurately detect a rotation angle.
　上記目的を達成するために、本発明に係るモータは、シャフトと、前記シャフトに支持された回転体と、前記シャフトの長手方向において、前記回転体に対向する面を有する回路基板と、前記回路基板の前記面に設けられた発光部と、前記回路基板の前記面に設けられた受光部と、を備え、前記発光部と前記受光部は、径方向において、互いに離間して配置されており、前記シャフトの長手方向において、前記回転体の面には突出部が設けられており、前記突出部が前記シャフトの回転に伴って前記発光部と前記受光部との間を通過する。 In order to achieve the above object, a motor according to the present invention includes a shaft, a rotating body supported by the shaft, a circuit board having a surface facing the rotating body in a longitudinal direction of the shaft, and A light-emitting unit provided on the surface of the board, and a light-receiving unit provided on the surface of the circuit board, the light-emitting unit and the light-receiving unit are arranged apart from each other in a radial direction. In the longitudinal direction of the shaft, a projection is provided on a surface of the rotating body, and the projection passes between the light emitting unit and the light receiving unit as the shaft rotates.
　本発明の一態様に係るモータにおいて、前記突出部の形状は、筒状であり、前記突出部の外周面には、貫通孔が形成されている。 に お い て In the motor according to one aspect of the present invention, the shape of the protruding portion is cylindrical, and a through hole is formed in an outer peripheral surface of the protruding portion.
　本発明の一態様に係るモータにおいて、前記突出部の形状は、筒状であり、前記突出部の外周面には、周方向において、所定の間隔にて複数の貫通孔が形成されている。 に お い て In the motor according to one aspect of the present invention, the shape of the protruding portion is cylindrical, and a plurality of through holes are formed on the outer peripheral surface of the protruding portion at predetermined intervals in the circumferential direction.
　本発明の一態様に係るモータにおいて、径方向に延在するベース部を有するハウジングを備え、前記ベース部に前記回路基板が支持されている。 モ ー タ A motor according to one aspect of the present invention includes a housing having a base portion extending in a radial direction, and the circuit board is supported by the base portion.
　本発明の一態様に係るモータにおいて、ステータを備え、前記回路基板は、前記シャフトの長手方向において、前記回転体と前記ステータとの間に配置されている。 モ ー タ A motor according to an aspect of the present invention includes a stator, wherein the circuit board is disposed between the rotating body and the stator in a longitudinal direction of the shaft.
　本発明の一態様に係るモータにおいて、軸受を備え、前記軸受は、径方向において、前記回転体の内側に配置されている。 モ ー タ The motor according to one aspect of the present invention includes a bearing, and the bearing is disposed radially inside the rotating body.
　本発明の一態様に係るモータにおいて、前記突出部の形状は、円柱である。 に お い て In the motor according to one aspect of the present invention, the shape of the protrusion is a column.
　上記目的を達成するために、本発明に係るモータは、シャフトと、前記シャフトに支持された回転体と、前記シャフトの長手方向において、前記回転体に対向する面を有する回路基板と、前記回路基板の面に設けられた発光部と、前記回路基板の前記面に設けられた受光部と、を備え、前記シャフトの長手方向において、前記回転体の面には突出部が設けられており、径方向において、前記発光部と前記受光部は、前記突出部の外周面に対向して配置されており、前記突出部の外周面は、前記発光部から発光された光を前記受光部へ反射させる反射面を有することを特徴とする。 In order to achieve the above object, a motor according to the present invention includes a shaft, a rotating body supported by the shaft, a circuit board having a surface facing the rotating body in a longitudinal direction of the shaft, and A light-emitting unit provided on the surface of the substrate, and a light-receiving unit provided on the surface of the circuit board, and a protrusion is provided on the surface of the rotating body in the longitudinal direction of the shaft, In the radial direction, the light emitting section and the light receiving section are disposed so as to face an outer peripheral surface of the projecting section, and the outer peripheral surface of the projecting section reflects light emitted from the light emitting section to the light receiving section. It is characterized by having a reflecting surface to make it.
　本発明に係るモータによれば、回転角度を精度良く検出することができる。 According to the motor of the present invention, the rotation angle can be accurately detected.
本発明の第１の実施の形態に係るモータの構成を概略的に示す斜視図である。1 is a perspective view schematically showing a configuration of a motor according to a first embodiment of the present invention. 本発明の第１の実施の形態に係るモータの構成を概略的に示す図１のＡ－Ａ断面図である。FIG. 2 is a cross-sectional view along the line AA in FIG. 1 schematically illustrating a configuration of the motor according to the first embodiment of the present invention. 本発明の第１の実施の形態に係るモータの回転体の構成を概略的に示す斜視図である。It is a perspective view showing roughly composition of a rotating body of a motor concerning a 1st embodiment of the present invention. 本発明の第１の実施の形態に係るモータの回路基板とハウジングとを分離した状態で示す斜視図である。FIG. 2 is a perspective view showing a state in which a circuit board and a housing of the motor according to the first embodiment of the present invention are separated. 本発明の第１の実施の形態に係るモータの回路基板とハウジングとを組み立てた状態で示す斜視図である。FIG. 3 is a perspective view showing a circuit board and a housing of the motor according to the first embodiment of the present invention in an assembled state. 本発明の第１の実施の形態に係るモータの回転体の変形例を示すための図であり、図６（ａ）は、回転体の第１の変形例を示す斜視図であり、図６（ｂ）は、回転体の第２の変形例を示す斜視図である。FIG. 6A is a diagram showing a modification of the rotating body of the motor according to the first embodiment of the present invention, and FIG. 6A is a perspective view showing a first modified example of the rotating body. (B) is a perspective view showing a second modification of the rotating body. 本発明の第２の実施の形態に係るモータの回転体の構成を概略的に示す斜視図である。It is a perspective view showing roughly composition of a rotating body of a motor concerning a 2nd embodiment of the present invention. 本発明の第２の実施の形態に係るモータの回路基板とハウジングの構成を概略的に示す斜視図である。It is a perspective view showing roughly composition of a circuit board and a housing of a motor concerning a 2nd embodiment of the present invention.
　以下、本発明の実施の形態について図面を参照しながら具体的に説明する。 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
［１．第１の実施の形態］
　はじめに、図１乃至図５を参照して、本発明の第１の実施の形態に係るモータの構成について説明する。 [1. First Embodiment]
First, a configuration of a motor according to a first embodiment of the present invention will be described with reference to FIGS.
［１－１．モータの全体構成］
　まず、図１及び図２を参照して、本発明の第１の実施の形態に係るモータの全体構成について説明する。図１は、本発明の第１の実施の形態に係るモータ１の構成を概略的に示す斜視図である。図２は、図１のＡ－Ａ線に沿う断面における断面図である。 [1-1. Overall configuration of motor]
First, an overall configuration of a motor according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view schematically showing a configuration of a motor 1 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along a line AA in FIG.
　以下、説明の便宜上、軸線ｘ方向において矢印ａ方向を上側ａとし、矢印ｂ方向を下側ｂとする。また、軸線ｘに対して垂直な方向（以下、「径方向」ともいう。）において、軸線ｘから遠ざかる方向（図１の矢印ｃ方向）を外周側ｃとし、軸線ｘに向かう方向（図１の矢印ｄ方向）を内周側ｄとする。そして、軸線ｘを中心とする円周方向（図１の矢印ｅ方向）を周方向ｅとする。 Hereinafter, for convenience of explanation, the direction of arrow a in the direction of the axis x is defined as the upper side a, and the direction of arrow b is defined as the lower side b. In a direction perpendicular to the axis x (hereinafter, also referred to as a “radial direction”), a direction away from the axis x (the direction of arrow c in FIG. 1) is defined as an outer peripheral side c, and a direction toward the axis x (FIG. 1). (In the direction of arrow d) is defined as the inner peripheral side d. A circumferential direction around the axis x (the direction of arrow e in FIG. 1) is defined as a circumferential direction e.
　図１に示すように、本発明の第１の実施の形態に係るモータ１は、軸線ｘを中心に反時計回りに回転するシャフト２と、シャフト２に支持された回転体３と、回転体３に対向する面４ａを有する回路基板４（図２参照）と、回路基板４の面４ａに設けられて光を発光する発光部５（図２参照）と、回路基板４の面４ａに設けられて発光部５から発光された光を受光する受光部６（図２参照）とを備えている。 As shown in FIG. 1, a motor 1 according to a first embodiment of the present invention includes a shaft 2 that rotates counterclockwise around an axis x, a rotating body 3 supported by the shaft 2, and a rotating body 3. A circuit board 4 (see FIG. 2) having a surface 4a opposed to the light emitting device 3; a light emitting unit 5 (see FIG. 2) provided on the surface 4a of the circuit board 4 to emit light; And a light receiving unit 6 (see FIG. 2) for receiving the light emitted from the light emitting unit 5.
　また、図２に示すように、モータ１は、内部に回転体３及び回路基板４を収容するハウジング７と、シャフト２を囲むステータ９とを有している。 As shown in FIG. 2, the motor 1 has a housing 7 that houses the rotating body 3 and the circuit board 4 therein, and a stator 9 that surrounds the shaft 2.
　シャフト２は、長手方向（以下、軸線ｘ方向と呼称する。）における上側ａに配置された端部２ａと、軸線ｘ方向における下側ｂに配置された端部２ｂとを有し、軸線ｘを中心に反時計回りに回転する。シャフト２の上側ａの部分は、後述する回転体３の孔部３１から上側ａへ突出している。 The shaft 2 has an end 2a disposed on an upper side a in a longitudinal direction (hereinafter, referred to as an axis x direction) and an end 2b disposed on a lower side b in the axis x direction. Rotate counterclockwise around. The upper part a of the shaft 2 projects upward from a hole 31 of the rotating body 3 described later.
［１－２．回転体の構成］
　次いで、図２及び図３を参照して、回転体３の構成について説明する。図３は、モータ１の回転体３の構成を概略的に示す斜視図である。 [1-2. Configuration of rotating body]
Next, the configuration of the rotating body 3 will be described with reference to FIGS. 2 and 3. FIG. 3 is a perspective view schematically showing a configuration of the rotating body 3 of the motor 1.
　図２及び図３に示すように、回転体３は、底部３０ａと筒部３０ｂを有しており、軸線ｘ方向における上側ａにある上面３ａと、回路基板４の面４ａに対向する面３ｂと、回路基板４側に配置される端面３ｅと、上面３ａと端面３ｅとの間にあるとともに軸線ｘ方向における外周側ｃにある外周面３ｃと、上面３ａと端面３ｅとの間にあるとともに軸線ｘ方向における内周側ｄにある内周面３ｄとを有している。回転体３は、回路基板４に接触することなくシャフト２の回転に伴って軸線ｘを中心として反時計回りに回転する。 As shown in FIGS. 2 and 3, the rotating body 3 has a bottom part 30 a and a cylindrical part 30 b, and an upper surface 3 a on the upper side a in the axis x direction and a surface 3 b facing the surface 4 a of the circuit board 4. An end surface 3e disposed on the circuit board 4 side, an outer peripheral surface 3c between the upper surface 3a and the end surface 3e and on the outer peripheral side c in the axis x direction, and between the upper surface 3a and the end surface 3e. And an inner peripheral surface 3d on the inner peripheral side d in the direction of the axis x. The rotating body 3 rotates counterclockwise about the axis x with the rotation of the shaft 2 without contacting the circuit board 4.
　図２に示すように、回転体３の上面３ａには、シャフト２の軸線ｘ方向における上側ａの部分が挿通する孔部３１が形成されている。孔部３１は、軸線ｘ方向における上側ａへ突出した円筒形状を有している。 孔 As shown in FIG. 2, a hole 31 is formed in the upper surface 3a of the rotating body 3 so that a portion of the upper side a in the axis x direction of the shaft 2 is inserted. The hole 31 has a cylindrical shape protruding upward in the axis x direction.
　図３に示すように、軸線ｘ方向において、回転体３の面３ｂには突出部３２が設けられている。突出部３２の形状は、軸線ｘを中心とする円筒状であり、面３ｂから回路基板４（図２参照）側へ突出している。また、突出部３２は、回転体３の内周面３ｄより内周側ｄに配置されている。この突出部３２の回路基板４側の端面３２ａは、回路基板４の面４ａと所定の間隔を隔てるように配置されている（図２参照）。 (3) As shown in FIG. 3, a projection 32 is provided on the surface 3b of the rotating body 3 in the direction of the axis x. The shape of the protruding portion 32 is cylindrical with the axis x as the center, and protrudes from the surface 3b toward the circuit board 4 (see FIG. 2). Further, the protruding portion 32 is disposed on the inner peripheral side d of the inner peripheral surface 3 d of the rotating body 3. The end surface 32a of the protruding portion 32 on the circuit board 4 side is arranged so as to be separated from the surface 4a of the circuit board 4 by a predetermined distance (see FIG. 2).
　突出部３２は、軸線ｘ方向において下側ｂに配置され、シャフト２の回転に伴って発光部５と受光部６（図２参照）との間を通過する円筒状の下側の部分３３と、下側の部分３３の上側ａに配置された円筒状の上側の部分３４とを有している。下側の部分３３及び上側の部分３４は、突出部３２の一部であるが実際は一体化されて配置されている。 The protruding portion 32 is disposed on the lower side b in the direction of the axis x, and has a cylindrical lower portion 33 that passes between the light emitting portion 5 and the light receiving portion 6 (see FIG. 2) as the shaft 2 rotates. , And a cylindrical upper part 34 disposed on the upper side a of the lower part 33. The lower portion 33 and the upper portion 34 are a part of the protruding portion 32 but are actually arranged integrally.
　突出部３２の下側の部分３３は、突出部３２の端面３２ａを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６の先端６ａ（図２参照）と対向する位置から端面３２ａまでの部分である。突出部３２の下側の部分３３は、発光部５及び受光部６と所定の間隔を隔てるように配置されている。シャフト２が回転すると、突出部３２の下側の部分３３は、シャフト２の回転に伴って発光部５及び受光部６に接触することのない状態で発光部５と受光部６との間を通過する。 The lower portion 33 of the protruding portion 32 has a tip 5 a of the light emitting portion 5 (see FIG. 2) and a tip of the light receiving portion 6 when the end face 32 a of the protruding portion 32 is arranged to face the circuit board 4. 6a (see FIG. 2) to the end face 32a. The lower part 33 of the protruding part 32 is arranged so as to be spaced from the light emitting part 5 and the light receiving part 6 by a predetermined distance. When the shaft 2 rotates, the lower portion 33 of the protrusion 32 moves between the light emitting unit 5 and the light receiving unit 6 without contact with the light emitting unit 5 and the light receiving unit 6 as the shaft 2 rotates. pass.
　突出部３２の上側の部分３４は、突出部３２の端面３２ａを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６の先端６ａ（図２参照）と対向する位置から回転体３の面３ｂまでの部分である。 The upper portion 34 of the protruding portion 32 has a tip 5a of the light emitting portion 5 (see FIG. 2) and a tip 6a of the light receiving portion 6 in a state where the end surface 32a of the protruding portion 32 is arranged so as to face the circuit board 4. (See FIG. 2) from the position facing to the surface 3b of the rotating body 3.
　図３に示すように、突出部３２の外周側ｃにある外周面３２ｃには、周方向ｅにおいて、発光部５から発光された光が通過する長方形状の貫通孔３５が形成されている。 As shown in FIG. 3, a rectangular through hole 35 through which light emitted from the light emitting unit 5 passes is formed in the outer circumferential surface 32 c on the outer circumferential side c of the protrusion 32 in the circumferential direction e.
　貫通孔３５は、突出部３２の外周側ｃにある外周面３２ｃから内周側ｄにある内周面３２ｄへ貫通している。また、貫通孔３５は、突出部３２の外周面３２ｃに等間隔に複数（本発明の第１の実施の形態では、４個。）形成されている。 The through hole 35 penetrates from the outer peripheral surface 32c on the outer peripheral side c of the protruding portion 32 to the inner peripheral surface 32d on the inner peripheral side d. Further, a plurality of through holes 35 (four in the first embodiment of the present invention) are formed on the outer peripheral surface 32c of the protruding portion 32 at equal intervals.
　なお、貫通孔３５は、突出部３２の下側の部分３３及び上側の部分３４に形成されている場合について説明するが、貫通孔３５の少なくとも一部が突出部３２の下側の部分３３に形成されていればよく、突出部３２の下側の部分３３にのみ形成されていてもよい。 The case where the through-hole 35 is formed in the lower part 33 and the upper part 34 of the protruding part 32 will be described, but at least a part of the through-hole 35 is formed in the lower part 33 of the protruding part 32. It may be formed only on the lower portion 33 of the protrusion 32 as long as it is formed.
［１－３．回路基板の構成］
　次いで、図４及び図５を参照して、回路基板４の構成について説明する。図４は、モータ１の回路基板４とハウジング７とを分離した状態で示す斜視図である。図５は、モータ１の回路基板４とハウジング７とを組み立てた状態で示す斜視図である。 [1-3. Configuration of circuit board]
Next, the configuration of the circuit board 4 will be described with reference to FIGS. FIG. 4 is a perspective view showing the circuit board 4 and the housing 7 of the motor 1 in a separated state. FIG. 5 is a perspective view showing a state in which the circuit board 4 and the housing 7 of the motor 1 are assembled.
　図４に示すように、回路基板４は、径方向へ延在しており、回転体３側の面４ａと、ステータ９に対向する面であるステータ９側の面４ｂと、面４ａと面４ｂとの間で外周側ｃにある一対の側面４ｃ及び一対の側面４ｄとを有している。一対の側面４ｃは、径方向に延在している。一対の側面４ｄは、一対の側面４ｃと略垂直な方向に面している。回路基板４は、シャフト２の軸線ｘ方向において、回転体３とステータ９との間に配置されている（図２参照）。 As shown in FIG. 4, the circuit board 4 extends in the radial direction, and has a surface 4 a on the rotating body 3 side, a surface 4 b on the stator 9 side facing the stator 9, and a surface 4 a. 4b and a pair of side surfaces 4c and a pair of side surfaces 4d on the outer peripheral side c. The pair of side surfaces 4c extend in the radial direction. The pair of side surfaces 4d faces in a direction substantially perpendicular to the pair of side surfaces 4c. The circuit board 4 is disposed between the rotating body 3 and the stator 9 in the axis x direction of the shaft 2 (see FIG. 2).
　図５に示すように、回路基板４の面４ａには、発光部５及び受光部６が設けられている。発光部５と受光部６とは、径方向において、互いに離間して配置されている。具体的には、外周側ｃに発光部５が配置され、内周側ｄに受光部６が配置されている。 発 光 As shown in FIG. 5, a light emitting unit 5 and a light receiving unit 6 are provided on the surface 4 a of the circuit board 4. The light emitting unit 5 and the light receiving unit 6 are arranged apart from each other in the radial direction. Specifically, the light emitting unit 5 is arranged on the outer peripheral side c, and the light receiving unit 6 is arranged on the inner peripheral side d.
　発光部５及び受光部６は、光学センサであり、発光部５は、赤外線ＬＥＤ（ＬｉｇｈｔＥｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）や半導体レーザ等の光源である。受光部６は、フォトダイオードやフォトトランジスタ等である。 The light emitting unit 5 and the light receiving unit 6 are optical sensors, and the light emitting unit 5 is a light source such as an infrared LED (Light Emitting @Diode) or a semiconductor laser. The light receiving unit 6 is a photodiode, a phototransistor, or the like.
　図４に示すように、回路基板４には、後述するハウジング７のボス７７が挿入される孔部４１と、孔部４１の縁部分である縁部４２と、シャフト２及び後述するハウジング７の孔部７９が挿通される孔部４３とを有している。 As shown in FIG. 4, the circuit board 4 has a hole 41 into which a boss 77 of the housing 7 described later is inserted, an edge 42 which is an edge of the hole 41, the shaft 2 and the housing 7 described later. And a hole 43 into which the hole 79 is inserted.
　孔部４１は、回路基板４に複数（本発明の第１の実施の形態では、２個。）形成されている。孔部４１は、一対の側面４ｃ近傍にそれぞれ形成されており、回路基板４の面４ａから回路基板４の面４ｂへ貫通している。孔部４１に後述するハウジング７のボス７７が挿入されると、回路基板４は、シャフト２の長手方向（軸線ｘ方向）において回転体３とステータ９との間に配置される（図２参照）。 A plurality of holes 41 (two holes in the first embodiment of the present invention) are formed in the circuit board 4. The holes 41 are formed near the pair of side surfaces 4c, respectively, and penetrate from the surface 4a of the circuit board 4 to the surface 4b of the circuit board 4. When a boss 77 of the housing 7 described later is inserted into the hole 41, the circuit board 4 is disposed between the rotating body 3 and the stator 9 in the longitudinal direction (the axis x direction) of the shaft 2 (see FIG. 2). ).
　縁部４２は、側面４ｃから外周側ｃへ突出している。縁部４２は、後述するハウジング７のボス７７が孔部４１に挿入されると、ハウジング７の縁部７８と接触する。 The edge 42 protrudes from the side surface 4c to the outer peripheral side c. The edge 42 comes into contact with an edge 78 of the housing 7 when a boss 77 of the housing 7 described later is inserted into the hole 41.
　孔部４３は、回路基板４の中央又は略中央に形成されており、回路基板４の面４ａから回路基板４の面４ｂへ貫通している。 The hole 43 is formed at the center or substantially the center of the circuit board 4, and penetrates from the surface 4 a of the circuit board 4 to the surface 4 b of the circuit board 4.
［１－４．ハウジングの構成］
　次いで、図２、図４及び図５を参照して、ハウジング７の構成について説明する。 [1-4. Housing Configuration]
Next, the configuration of the housing 7 will be described with reference to FIGS.
　図５に示すように、ハウジング７は、軸線ｘ方向における上側ａに配置されて回転体３の外周面３ｃを覆う上側ハウジング７１と、軸線ｘ方向における下側ｂに配置されてステータ９を収容する下側ハウジング７２とを有している。 As shown in FIG. 5, the housing 7 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 3, and the housing 7 is disposed on the lower side b in the axis x direction and accommodates the stator 9. And a lower housing 72.
　図４に示すように、上側ハウジング７１は、軸線ｘ方向における上側ａに配置された端面７１ａと、軸線ｘを中心とする円盤状又は略円盤状で端面７１ａの下側ｂに配置された下面７１ｂと、端面７１ａと下面７１ｂとの間にあるとともに軸線ｘ方向における外周側ｃにある外周面７１ｃとを有している。外周面７１ｃは、回転体３の外周面３ｃの外周側ｃに配置される。 As shown in FIG. 4, the upper housing 71 has an end surface 71 a arranged on the upper side a in the direction of the axis x, and a lower surface arranged on the lower side b of the end surface 71 a in a disk shape or a substantially disk shape centered on the axis x. 71b and an outer peripheral surface 71c between the end surface 71a and the lower surface 71b and on the outer peripheral side c in the axis x direction. The outer peripheral surface 71c is arranged on the outer peripheral side c of the outer peripheral surface 3c of the rotating body 3.
　上側ハウジング７１の下面７１ｂは、軸線ｘ方向における上側ａに配置されて回転体３に対向する回転体３側の底面７３と、軸線ｘ方向における下側ｂに配置されて回路基板４に対向する回路基板４側の底面７４とを有している。 The lower surface 71b of the upper housing 71 is disposed on the upper side a in the axis x direction and faces the rotating body 3 and the bottom surface 73 on the rotating body 3 side, and is disposed on the lower side b in the axis x direction and faces the circuit board 4. And a bottom surface 74 on the circuit board 4 side.
　図５に示すように、上側ハウジング７１の下面７１ｂには、発光部５及び受光部６を露出させる孔７５が形成されている。孔７５は、回路基板４を上側ハウジング７１に固定する際に、回路基板４の面４ａに配置された発光部５及び受光部６が、軸線ｘ方向における下側ｂから上側ａへ挿通可能に形成されている。具体的には、孔７５は、回転体３側の底面７３から回路基板４側の底面７４へ貫通している。 孔 As shown in FIG. 5, a hole 75 for exposing the light emitting unit 5 and the light receiving unit 6 is formed in the lower surface 71b of the upper housing 71. The hole 75 allows the light emitting unit 5 and the light receiving unit 6 disposed on the surface 4a of the circuit board 4 to be inserted from the lower side b in the axis x direction to the upper side a when the circuit board 4 is fixed to the upper housing 71. Is formed. Specifically, the hole 75 penetrates from the bottom surface 73 on the rotating body 3 side to the bottom surface 74 on the circuit board 4 side.
　図４に示すように、回路基板４側の底面７４は、径方向に延在するベース部７６と、円柱形状又は略円柱形状のボス７７と、回路基板４の縁部４２に接触する縁部７８と、内部にシャフト２が挿通される円筒状又は略円筒形状の挿通孔７９ｈが形成された孔部７９とを有している。 As shown in FIG. 4, the bottom surface 74 on the circuit board 4 side has a base portion 76 extending in the radial direction, a columnar or substantially columnar boss 77, and an edge portion that contacts the edge portion 42 of the circuit board 4. 78, and a hole portion 79 in which a cylindrical or substantially cylindrical insertion hole 79h into which the shaft 2 is inserted is formed.
　ベース部７６は、径方向における両端部において回路基板４の一対の側面４ｄを係止する爪８０ａ，８０ｂを有している。ボス７７は、回路基板４側の底面７４から軸線ｘ方向における下側ｂへ突出している。爪８０ａ，８０ｂに回路基板４の一対の側面４ｄが係止されるとともに、回路基板４の孔部４１にボス部４４が挿入されると、ベース部７６に対して回路基板４が支持されることになる。このとき、縁部７８は、回路基板４の縁部４２に接触する。 The base portion 76 has claws 80a and 80b at both ends in the radial direction for locking the pair of side surfaces 4d of the circuit board 4. The boss 77 projects from the bottom surface 74 on the circuit board 4 side to the lower side b in the axis x direction. When the pair of side surfaces 4 d of the circuit board 4 is locked by the claws 80 a and 80 b and the boss 44 is inserted into the hole 41 of the circuit board 4, the circuit board 4 is supported by the base 76. Will be. At this time, the edge 78 contacts the edge 42 of the circuit board 4.
　孔部７９は、回路基板４側の底面７４から軸線ｘ方向における下側ｂへ延出しており、ベース部７６に回路基板４が支持されると、回路基板４の孔部４３に挿通される。 The hole 79 extends from the bottom surface 74 on the circuit board 4 side to the lower side b in the axis x direction, and is inserted into the hole 43 of the circuit board 4 when the circuit board 4 is supported by the base 76. .
　図２に示すように、上側ハウジング７１と下側ハウジング７２とは、上側ハウジング７１の外周側ｃに形成された突起７ａを下側ハウジング７２に形成された孔７ｂに挿入することにより連結される。 As shown in FIG. 2, the upper housing 71 and the lower housing 72 are connected by inserting a projection 7 a formed on the outer peripheral side c of the upper housing 71 into a hole 7 b formed on the lower housing 72. .
　上側ハウジング７１及び下側ハウジング７２の内部には、シャフト２を含むロータ８と、ロータ８を囲むステータ９が収容されている。また、ハウジング７の内部には、シャフト２の軸線ｘ方向における上側ａの部分を回転可能に支える軸受８１ａと、シャフト２の軸線ｘ方向における下側ｂの部分を回転可能に支える軸受８１ｂとを有している。 ロ ー タ A rotor 8 including the shaft 2 and a stator 9 surrounding the rotor 8 are housed inside the upper housing 71 and the lower housing 72. Further, inside the housing 7, a bearing 81a that rotatably supports an upper part a in the axis x direction of the shaft 2 and a bearing 81b that rotatably supports a lower part b in the axis x direction of the shaft 2 are provided. Have.
　軸受８１ａ及び軸受８１ｂは、径方向において、回転体３の内側に配置されている。具体的には、軸受８１ａ及び軸受８１ｂは、回転体３の上面３ａより下側ｂで、且つ、回転体３の突出部３２より内周側ｄに配置されている。 The bearing 81a and the bearing 81b are arranged inside the rotating body 3 in the radial direction. Specifically, the bearing 81 a and the bearing 81 b are arranged on the lower side b of the upper surface 3 a of the rotating body 3 and on the inner peripheral side d of the protrusion 32 of the rotating body 3.
　ロータ８は、シャフト２と、シャフト２を囲むように環状に形成されたコア８３と、コア８３の外周側ｃの面を囲むように環状に形成されたマグネット８４とを有している。シャフト２の上側ａの部分は、孔部３１に挿通されている。シャフト２の外周側ｃの面と孔部３１の内周側ｄの面との間にはブッシュ８２が取り付けられている。 The rotor 8 has the shaft 2, an annular core 83 surrounding the shaft 2, and an annular magnet 84 surrounding the outer circumferential surface c of the core 83. The upper part a of the shaft 2 is inserted into the hole 31. A bush 82 is attached between a surface on the outer peripheral side c of the shaft 2 and a surface on the inner peripheral side d of the hole 31.
　ステータ９は、ロータ８を囲むように環状に形成されたステータコア９１と、ステータコア９１から内周側ｄに延在した延在部（図示せず）に巻回されたコイル９２と、ステータコア９１とコイル９２とを絶縁するインシュレータ（図示せず）とを有している。 The stator 9 includes a stator core 91 formed in an annular shape so as to surround the rotor 8, a coil 92 wound around an extension (not shown) extending from the stator core 91 to the inner peripheral side d, and a stator core 91. And an insulator (not shown) for insulating the coil 92 from the coil 92.
［１－５．回転位置の検出方法］
　次いで、モータ１の回転位置の検出方法について説明する。 [1-5. Rotational position detection method]
Next, a method for detecting the rotational position of the motor 1 will be described.
　ロータ８及びステータ９によってシャフト２が軸線ｘを中心に反時計回りに回転すると、シャフト２に支持された回転体３も反時計回りに回転する。 When the shaft 2 rotates counterclockwise about the axis x by the rotor 8 and the stator 9, the rotating body 3 supported by the shaft 2 also rotates counterclockwise.
　そして、回転体３が回転すると、突出部３２の下側の部分３３が発光部５及び受光部６に接触することなく発光部５と受光部６との間を通過する。この際、回転体３の回転に伴って突出部３２に形成された貫通孔３５が発光部５と受光部６との間を通過するため、受光部６により発光部５からの受光の有無が生じる。すなわち、発光部５と受光部６との間を貫通孔３５が通過すると受光部６が発光部５からの光を受光する。また、突出部３２の下側の部分３３のうち貫通孔３５以外の部分が発光部５及び受光部６と対向すると、発光部５からの光が遮蔽されるため、受光部６は発光部５からの光を受光することができない。このようにして受光の有無が生じ、その受光タイミングによって、図示しないコントロールユニット等を介してシャフト２の回転角度（回転位置）、回転数及び回転速度が検出される。 When the rotating body 3 rotates, the lower portion 33 of the protrusion 32 passes between the light emitting unit 5 and the light receiving unit 6 without contacting the light emitting unit 5 and the light receiving unit 6. At this time, since the through hole 35 formed in the protruding portion 32 passes between the light emitting section 5 and the light receiving section 6 with the rotation of the rotating body 3, the presence or absence of light reception from the light emitting section 5 by the light receiving section 6 is determined. Occurs. That is, when the through hole 35 passes between the light emitting unit 5 and the light receiving unit 6, the light receiving unit 6 receives the light from the light emitting unit 5. When a portion other than the through hole 35 of the lower portion 33 of the protrusion 32 faces the light emitting unit 5 and the light receiving unit 6, light from the light emitting unit 5 is blocked. Cannot receive light from the Thus, the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
　このようにモータ１において、回転体３の突出部３２が発光部５と受光部６との間を通過し、受光部６が受光する発光部５からの光の受光タイミングによってシャフト２の回転位置を検出している。このため、シャフト２の回転に伴って変化する磁束を検出して回転位置を検出する場合と比較して、環境温度の変化が回転角度の検出精度に影響されず、回転角度を精度良く検出することができる。 As described above, in the motor 1, the protrusion 32 of the rotating body 3 passes between the light emitting unit 5 and the light receiving unit 6, and the rotation position of the shaft 2 is determined by the light receiving timing of the light from the light emitting unit 5 received by the light receiving unit 6. Has been detected. Therefore, as compared with the case where the rotational position is detected by detecting the magnetic flux that changes with the rotation of the shaft 2, the change in the environmental temperature is not affected by the detection accuracy of the rotation angle, and the rotation angle is detected with high accuracy. be able to.
　また、発光部５及び受光部６が設けられた回路基板４がハウジング７のベース部７６に支持されているため、発光部５及び受光部６を径方向に水平に配置することができる。特に、回路基板４の孔部４１にベース部７６のボス７７を挿入することによりベース部７６に回路基板４を支持させるため、容易に水平に配置することができる。 Since the circuit board 4 on which the light emitting unit 5 and the light receiving unit 6 are provided is supported by the base 76 of the housing 7, the light emitting unit 5 and the light receiving unit 6 can be arranged horizontally in the radial direction. In particular, since the circuit board 4 is supported by the base 76 by inserting the boss 77 of the base 76 into the hole 41 of the circuit board 4, the circuit board 4 can be easily arranged horizontally.
　さらに、回路基板４の一対の側面４ｃを係止する爪８０ａ，８０ｂを有しているため、回路基板４を回転体３の径方向に水平に配置させた状態を維持することができる。 Furthermore, since the claws 80a and 80b for locking the pair of side surfaces 4c of the circuit board 4 are provided, it is possible to maintain a state in which the circuit board 4 is horizontally arranged in the radial direction of the rotating body 3.
　また、発光部５及び受光部６が設けられた回路基板４は、軸線ｘ方向において回転体３とステータ９との間に配置されているため、シャフト２及び回転体３の位相を調整し易くすることができる。 Further, since the circuit board 4 provided with the light emitting unit 5 and the light receiving unit 6 is disposed between the rotating body 3 and the stator 9 in the direction of the axis x, it is easy to adjust the phases of the shaft 2 and the rotating body 3. can do.
　そして、軸受８１ａ及び軸受８１ｂは、回転体３の上面３ａより軸線ｘ方向における下側ｂで、且つ、回転体３の突出部３２の内周側ｄに配置されている。このため、モータ１の軸線ｘ方向における高さを低くして全体的に小型化を図ることができる。 The bearing 81 a and the bearing 81 b are arranged on the lower side b in the axis x direction from the upper surface 3 a of the rotating body 3 and on the inner peripheral side d of the protrusion 32 of the rotating body 3. For this reason, the height of the motor 1 in the direction of the axis x can be reduced, and the overall size can be reduced.
　なお、上述した本発明の第１の実施の形態においては、発光部５から発光された光が通過する貫通孔３５は、突出部３２の外周面３２ｃに複数形成されている場合について説明したが、外周面３２ｃに貫通孔３５が１つ形成されていてもよい。この場合、受光部６が発光部５からの光の受光タイミングにより、シャフト２の回転数及び回転速度を検出することができる。 In the above-described first embodiment of the present invention, a case has been described in which a plurality of through holes 35 through which light emitted from the light emitting unit 5 passes are formed on the outer peripheral surface 32 c of the protruding portion 32. Alternatively, one through hole 35 may be formed in the outer peripheral surface 32c. In this case, the light receiving unit 6 can detect the rotation speed and the rotation speed of the shaft 2 based on the light receiving timing of the light from the light emitting unit 5.
［１－６．変形例］
　次いで、図６を参照して、上述した第１の実施の形態に係るモータ１の回転体３の第１の変形例及び第２の変形例について説明する。図６は、モータ１の回転体３の変形例を示すための図であり、図６（ａ）は、モータ１における第１の変形例を示すための回転体１０３ａの斜視図であり、図６（ｂ）は、モータ１における第２の変形例を示すための回転体１０３ｂの斜視図である。以下、前述の第１の実施の形態に係るモータ１と同様又は類似する構成については同一の符号を付してその説明を省略する。 [1-6. Modification]
Next, a first modified example and a second modified example of the rotating body 3 of the motor 1 according to the first embodiment described above will be described with reference to FIG. FIG. 6 is a diagram showing a modification of the rotating body 3 of the motor 1, and FIG. 6A is a perspective view of a rotating body 103 a showing a first modification of the motor 1. FIG. 6B is a perspective view of a rotating body 103b showing a second modified example of the motor 1. Hereinafter, the same or similar components as those of the motor 1 according to the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
　図６（ａ）に示すように、回転体１０３ａは、回路基板４の面４ａに対向する面３ｂから回路基板４側（図２参照）へ突出する突出部１３２ａを有している。突出部１３２ａは、円柱形状を有している。この突出部１３２ａは、回転体３の内周面３ｄより内周側ｄに配置されている。 6A, the rotating body 103a has a protruding portion 132a that protrudes from the surface 3b facing the surface 4a of the circuit board 4 toward the circuit board 4 (see FIG. 2). The protrusion 132a has a columnar shape. The protruding portion 132a is arranged on the inner peripheral side d of the inner peripheral surface 3d of the rotating body 3.
　突出部１３２ａは、軸線ｘを中心とする周方向ｅにおいて、等間隔に複数（本第１の変形例では、４個。）配置されている。すなわち、複数の突出部１３２ａは、軸線ｘを中心に等角度（本第１の変形例では、９０度。）間隔に配置されている。 複数 A plurality (four in the first modification) of the protruding portions 132a are arranged at equal intervals in the circumferential direction e around the axis x. That is, the plurality of protrusions 132a are arranged at equal angles (90 degrees in the first modification example) about the axis x.
　また、突出部１３２ａは、軸線ｘ方向において下側ｂに配置され、シャフト２の回転に伴って発光部５と受光部６（図２参照）との間を通過する下側の部分１３３ａと、下側の部分１３３ａの軸線ｘ方向における上側ａに配置された上側の部分１３４ａとを有している。下側の部分１３３ａ及び上側の部分１３４ａは、突出部１３２ａの一部であるが実際は一体化されて配置されている。 Further, the protruding portion 132a is disposed on the lower side b in the direction of the axis x, and a lower portion 133a that passes between the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) as the shaft 2 rotates, An upper part 134a is disposed on the upper part a in the direction of the axis x of the lower part 133a. The lower portion 133a and the upper portion 134a are part of the protruding portion 132a, but are actually arranged integrally.
　突出部１３２ａの下側の部分１３３ａは、突出部１３２ａの端面１３０ａを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６の先端６ａ（図２参照）と対向する位置から端面１３０ａまでの部分である。突出部１３２ａの下側の部分１３３ａは、発光部５及び受光部６（図２参照）と所定の間隔を隔てるように配置されている。シャフト２が回転すると、突出部１３２ａの下側の部分１３３ａは、シャフト２の回転に伴って発光部５及び受光部６に接触することのない状態で発光部５と受光部６との間を通過する。 The lower portion 133a of the protruding portion 132a has a tip 5a of the light emitting portion 5 (see FIG. 2) and a tip of the light receiving portion 6 in a state where the end surface 130a of the protruding portion 132a is arranged so as to face the circuit board 4. 6a (see FIG. 2) to the end face 130a. The lower portion 133a of the protruding portion 132a is arranged so as to be separated from the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) by a predetermined distance. When the shaft 2 rotates, the lower portion 133a of the protruding portion 132a moves between the light emitting unit 5 and the light receiving unit 6 without contacting the light emitting unit 5 and the light receiving unit 6 with the rotation of the shaft 2. pass.
　突出部１３２ａの上側の部分１３４ａは、突出部１３２ａの端面１３０ａを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６（図２参照）の先端６ａと対向する位置から回転体１０３ａの面３ｂまでの部分である。 The upper portion 134a of the protruding portion 132a has the tip 5a of the light emitting portion 5 (see FIG. 2) and the light receiving portion 6 (see FIG. 2) when the end surface 130a of the protruding portion 132a is arranged so as to face the circuit board 4. 2) from the position facing the tip 6a to the surface 3b of the rotating body 103a.
　そして、シャフト２の回転に伴って回転体１０３ａが回転すると、突出部１３２ａの下側の部分１３３ａが発光部５及び受光部６（図２参照）に接触することなく発光部５と受光部６との間を通過する。この際、受光部６により発光部５からの受光の有無が生じる。すなわち、発光部５と受光部６との間を突出部１３２ａが通過していない状態では、受光部６が発光部５からの光を受光する。また、突出部１３２ａの下側の部分１３３ａが発光部５及び受光部６を通過すると、発光部５からの光が遮蔽されるため、受光部６は発光部５からの光を受光することができない。このようにして受光の有無が生じ、その受光タイミングによって、図示しないコントロールユニット等を介してシャフト２の回転角度（回転位置）、回転数及び回転速度が検出される。 When the rotating body 103a rotates with the rotation of the shaft 2, the lower portion 133a of the protrusion 132a does not contact the light emitting unit 5 and the light receiving unit 6 (see FIG. 2), and the light emitting unit 5 and the light receiving unit 6 do not contact each other. Pass between. At this time, the presence or absence of light reception from the light emitting unit 5 by the light receiving unit 6 occurs. That is, the light receiving unit 6 receives the light from the light emitting unit 5 in a state where the protrusion 132a does not pass between the light emitting unit 5 and the light receiving unit 6. When the lower portion 133a of the protruding portion 132a passes through the light emitting unit 5 and the light receiving unit 6, the light from the light emitting unit 5 is blocked, so that the light receiving unit 6 can receive the light from the light emitting unit 5. Can not. Thus, the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
　なお、上述した本第１の変形例においては、突出部１３２ａは、回転体１０３ａに複数配置されている場合について説明したが、突出部１３２ａは回転体１０３ａに１本のみ配置されていてもよい。また、突出部１３２ａは、円柱形状である場合について説明したが、四角柱形状、三角柱形状、筒形状等であってもよい。 Note that, in the first modification example described above, the case where a plurality of protrusions 132a are arranged on the rotating body 103a has been described, but only one protrusion 132a may be arranged on the rotating body 103a. . Further, the case where the protruding portion 132a has a cylindrical shape has been described, but may be a quadrangular prism shape, a triangular prism shape, a cylindrical shape, or the like.
　図６（ｂ）に示すように、回転体１０３ｂは、回路基板４の面４ａに対向する面３ｂから回路基板４（図２参照）側へ突出する突出部１３２ｂを有している。突出部１３２ｂの形状は、軸線ｘを中心とする円筒状である。この突出部１３２ｂは、回転体３の内周面３ｄより内周側ｄに配置されている。 6B, the rotating body 103b has a protruding portion 132b protruding from the surface 3b facing the surface 4a of the circuit board 4 toward the circuit board 4 (see FIG. 2). The shape of the protruding portion 132b is cylindrical with the axis x as the center. The protruding portion 132b is arranged on the inner peripheral side d of the inner peripheral surface 3d of the rotating body 3.
　突出部１３２ｂには、端面１３０ｂから面３ｂへ向かって切り欠いた切り欠き１３５ｂが形成されている。切り欠き１３５ｂは、軸線ｘを中心として等間隔に複数（本第１の変形例では、４個。）形成されている。 A notch 135b is formed in the protruding portion 132b so as to cut out from the end surface 130b toward the surface 3b. A plurality of cutouts 135b (four in the first modification example) are formed at equal intervals around the axis x.
　また、突出部１３２ｂは、軸線ｘ方向において下側ｂに配置され、シャフト２の回転に伴って発光部５と受光部６（図２参照）との間を通過する下側の部分１３３ｂと、下側の部分１３３ｂの軸線ｘ方向における上側ａに配置された上側の部分１３４ｂとを有している。下側の部分１３３ｂ及び上側の部分１３４ｂは、突出部１３２ｂの一部であるが実際は一体化されて配置されている。 In addition, the protruding portion 132b is disposed on the lower side b in the direction of the axis x, and a lower portion 133b that passes between the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) as the shaft 2 rotates, An upper portion 134b is disposed on the upper portion a in the axis x direction of the lower portion 133b. The lower part 133b and the upper part 134b are part of the protruding part 132b, but are actually arranged integrally.
　突出部１３２ｂの下側の部分１３３ｂは、突出部１３２ｂの端面１３０ｂを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６の先端６ａ（図２参照）と対向する位置から端面１３０ｂまでの部分である。突出部１３２ｂの下側の部分１３３ｂは、発光部５及び受光部６（図２参照）と所定の間隔を隔てるように配置されている。シャフト２が回転すると、突出部１３２ｂの下側の部分１３３ｂは、シャフト２の回転に伴って発光部５及び受光部６に接触することのない状態で発光部５と受光部６との間を通過する。 The lower portion 133b of the protruding portion 132b has a tip 5a (see FIG. 2) of the light emitting portion 5 and a tip of the light receiving portion 6 in a state where the end surface 130b of the protruding portion 132b is arranged to face the circuit board 4. 6a (see FIG. 2) to the end face 130b. The lower portion 133b of the protruding portion 132b is arranged so as to be separated from the light emitting unit 5 and the light receiving unit 6 (see FIG. 2) by a predetermined distance. When the shaft 2 rotates, the lower portion 133b of the protrusion 132b moves between the light emitting unit 5 and the light receiving unit 6 without contact with the light emitting unit 5 and the light receiving unit 6 as the shaft 2 rotates. pass.
　突出部１３２ｂの上側の部分１３４ｂは、突出部１３２ｂの端面１３０ｂを回路基板４に対して対向して配置させた状態において、発光部５の先端５ａ（図２参照）及び受光部６（図２参照）の先端６ａと対向する位置から回転体１０３ｂの面３ｂまでの部分である。 The upper portion 134b of the protruding portion 132b has the tip 5a of the light emitting portion 5 (see FIG. 2) and the light receiving portion 6 (see FIG. 2) when the end surface 130b of the protruding portion 132b is arranged to face the circuit board 4. 2) from the position facing the tip 6a to the surface 3b of the rotating body 103b.
　そして、シャフト２の回転に伴って回転体１０３ｂが回転すると、突出部１３２ｂの下側の部分１３３ｂが発光部５（図２参照）及び受光部６（図２参照）に接触することなく発光部５と受光部６との間を通過する。この際、回転体１０３ｂの回転に伴って突出部１３２ｂに形成された切り欠き１３５ｂが発光部５と受光部６との間を通過するため、受光部６により発光部５からの受光の有無が生じる。すなわち、発光部５と受光部６との間を切り欠き１３５ｂが通過すると受光部６が発光部５からの光を受光する。また、突出部１３２ｂの下側の部分１３３ｂのうち切り欠き１３５ｂ以外の部分が発光部５及び受光部６と対向すると、発光部５からの光が遮蔽されるため、受光部６は発光部５からの光を受光することができない。このようにして受光の有無が生じ、その受光タイミングによって、図示しないコントロールユニット等を介してシャフト２の回転角度（回転位置）、回転数及び回転速度が検出される。 Then, when the rotating body 103b rotates with the rotation of the shaft 2, the lower portion 133b of the protrusion 132b does not contact the light emitting unit 5 (see FIG. 2) and the light receiving unit 6 (see FIG. 2). 5 and between the light receiving unit 6. At this time, the notch 135b formed in the protruding portion 132b passes between the light emitting unit 5 and the light receiving unit 6 with the rotation of the rotating body 103b, so that the light receiving unit 6 determines whether or not light is received from the light emitting unit 5. Occurs. That is, when the notch 135b passes between the light emitting unit 5 and the light receiving unit 6, the light receiving unit 6 receives the light from the light emitting unit 5. When a portion other than the notch 135b of the lower portion 133b of the protruding portion 132b faces the light emitting unit 5 and the light receiving unit 6, light from the light emitting unit 5 is blocked. Cannot receive light from the Thus, the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
　なお、上述した本第２の変形例においては、突出部１３２ｂには、切り欠き１３５ｂが複数形成されている場合について説明したが、切り欠き１３５ｂが突出部１３２ｂに１箇所のみ形成されていてもよい。 Note that, in the second modification described above, the case where a plurality of notches 135b are formed in the protruding portion 132b has been described. However, even if the notch 135b is formed only in one place in the protruding portion 132b. Good.
［２．第２の実施の形態］
　次いで、図７及び図８を参照して、本発明の第２の実施の形態に係るモータの構成について説明する。図７は、本発明の第２の実施の形態に係るモータの回転体２０３の構成を概略的に示す斜視図である。図８は、本発明の第２の実施の形態に係るモータの回路基板４とハウジング２０７の構成を概略的に示す斜視図である。以下、前述の第１の実施の形態に係るモータ１と同様又は類似する構成については同一の符号を付してその説明を省略する。 [2. Second Embodiment]
Next, a configuration of a motor according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a perspective view schematically showing a configuration of a rotating body 203 of the motor according to the second embodiment of the present invention. FIG. 8 is a perspective view schematically showing the configuration of the circuit board 4 and the housing 207 of the motor according to the second embodiment of the present invention. Hereinafter, the same or similar components as those of the motor 1 according to the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
　図７に示すように、回転体２０３は、回路基板４の面４ａに対向する面３ｂから回路基板４側へ突出する突出部２３２を有している。突出部２３２の形状は、軸線ｘを中心とする円筒状である。この突出部２３２は、回転体２０３の内周面３ｄより内周側ｄに配置されている。 回 転 As shown in FIG. 7, the rotating body 203 has a protruding portion 232 protruding from the surface 3 b facing the surface 4 a of the circuit board 4 toward the circuit board 4. The shape of the protruding portion 232 is cylindrical with the axis x as the center. The protruding portion 232 is arranged on the inner peripheral side d of the inner peripheral surface 3 d of the rotating body 203.
　突出部２３２は、軸線ｘ方向において下側ｂに配置され、シャフト２の回転に伴って後述する発光部２０５及び受光部２０６（図８参照）の内周側ｄを通過する円筒状の下側の部分２３３と、下側の部分２３３の上側ａに配置された円筒状の上側の部分２３４とを有している。下側の部分２３３及び上側の部分２３４は、突出部２３２の一部であるが実際は一体化されて配置されている。 The protruding portion 232 is disposed on the lower side b in the direction of the axis x, and passes through the inner peripheral side d of a light emitting unit 205 and a light receiving unit 206 (see FIG. 8) described later as the shaft 2 rotates. And a cylindrical upper part 234 arranged on the upper side a of the lower part 233. The lower part 233 and the upper part 234 are part of the protruding part 232, but are actually arranged integrally.
　突出部２３２の下側の部分２３３は、突出部２３２の端面２３０を回路基板４に対して対向して配置させた状態において、発光部２０５の先端２０５ａ（図８参照）及び受光部２０６の先端２０６ａ（図８参照）と対向する位置から端面２３０までの部分である。突出部２３２の下側の部分２３３は、発光部２０５及び受光部２０６と所定の間隔を隔てるように配置されている。シャフト２が回転すると、突出部２３２の下側の部分２３３は、シャフト２の回転に伴って発光部２０５及び受光部２０６に接触することのない状態で発光部２０５及び受光部２０６の内周側ｄを回転する。 The lower portion 233 of the protrusion 232 has a tip 205 a of the light emitting unit 205 (see FIG. 8) and a tip of the light receiving unit 206 when the end surface 230 of the protrusion 232 is arranged to face the circuit board 4. The portion from the position facing 206a (see FIG. 8) to the end surface 230. The lower portion 233 of the protruding portion 232 is arranged so as to be separated from the light emitting unit 205 and the light receiving unit 206 by a predetermined distance. When the shaft 2 rotates, the lower portion 233 of the protruding portion 232 does not come into contact with the light emitting portion 205 and the light receiving portion 206 with the rotation of the shaft 2, and the inner peripheral side of the light emitting portion 205 and the light receiving portion 206. Rotate d.
　突出部２３２の上側の部分２３４は、突出部２３２の端面２３０が回路基板４に対して対向して配置させた状態において、発光部２０５の先端２０５ａ（図８参照）及び受光部６の先端２０６ａ（図８参照）が対向する位置から回転体３の面３ｂまでの部分である。 The upper portion 234 of the protrusion 232 has a tip 205 a of the light emitting unit 205 (see FIG. 8) and a tip 206 a of the light receiving unit 6 when the end surface 230 of the protrusion 232 is arranged to face the circuit board 4. (See FIG. 8) is a portion from the opposing position to the surface 3b of the rotating body 3.
　図７に示すように、突出部２３２の外周側ｃにある外周面３２ｃは、発光部２０５から発光された光を反射する長方形状の反射面２３５を有する。反射面２３５は、等間隔に複数（本発明の第２の実施の形態では、４個。）配置されている。 外 周 As shown in FIG. 7, the outer peripheral surface 32c on the outer peripheral side c of the protrusion 232 has a rectangular reflecting surface 235 that reflects the light emitted from the light emitting unit 205. A plurality of reflecting surfaces 235 (four in the second embodiment of the present invention) are arranged at equal intervals.
　図８に示すように、回路基板４（図２参照）の面４ａには、発光部２０５及び受光部２０６が設けられている。発光部２０５及び受光部２０６は、径方向に沿って、突出部２３２の外周面３２ｃに対向して配置されている。 As shown in FIG. 8, a light emitting unit 205 and a light receiving unit 206 are provided on a surface 4a of the circuit board 4 (see FIG. 2). The light emitting unit 205 and the light receiving unit 206 are arranged to face the outer peripheral surface 32c of the protrusion 232 along the radial direction.
　ハウジング２０７は、軸線ｘ方向における上側ａに配置されて回転体２０３の外周面３ｃを覆う上側ハウジング２７１と、軸線ｘ方向における下側ｂに配置されてステータ９（図２参照）を収容する下側ハウジング７２とを有している。 The housing 207 is disposed on the upper side a in the axis x direction and covers the outer peripheral surface 3c of the rotating body 203. The housing 207 is disposed on the lower side b in the axis x direction and accommodates the stator 9 (see FIG. 2). And a side housing 72.
　上側ハウジング２７１の下面２７１ｂは、軸線ｘ方向における上側ａに配置されて回転体２０３に対向する回転体３側の底面２７３と、軸線ｘ方向における下側ｂに配置されて回路基板４（図２参照）に対向する回路基板４側の底面２７４とを有している。 The lower surface 271b of the upper housing 271 is disposed on the upper side a in the direction of the axis x and is opposed to the rotary body 203. And the bottom surface 274 on the circuit board 4 side opposite to the bottom surface 274.
　上側ハウジング２７１の下面２７１ｂには、発光部２０５及び受光部２０６を露出させる孔２７５が形成されている。孔２７５は、回路基板４（図４参照）を上側ハウジング２７１に固定する際に、回路基板４の面４ａに配置された発光部２０５及び受光部２０６が、軸線ｘ方向における下側ｂから上側ａへ挿通可能に形成されている。具体的には、孔２７５は、回転体３側の底面２７３から回路基板４側の底面２７４へ貫通して形成されている。 孔 A hole 275 exposing the light emitting unit 205 and the light receiving unit 206 is formed in the lower surface 271b of the upper housing 271. When the circuit board 4 (see FIG. 4) is fixed to the upper housing 271, the light emitting unit 205 and the light receiving unit 206 arranged on the surface 4 a of the circuit board 4 move upward from the lower side b in the axis x direction. a. Specifically, the hole 275 penetrates from the bottom surface 273 on the rotating body 3 side to the bottom surface 274 on the circuit board 4 side.
　そして、回転体２０３が回転すると、突出部２３２の下側の部分２３３が発光部２０５及び受光部２０６に接触することなく発光部２０５及び受光部２０６の内周側ｄを回転する。この際、回転体２０３の回転に伴って突出部２３２の反射面２３５が発光部２０５及び受光部２０６の内周側ｄを通過するため、受光部２０６により発光部２０５からの受光の有無が生じる。すなわち、発光部２０５及び受光部２０６に反射面２３５が対向すると受光部２０６が発光部２０５からの光を受光する。また、突出部２３２の下側の部分２３３のうち反射面２３５以外の部分が発光部２０５及び受光部２０６と対向すると、受光部２０６は発光部２０５からの光を受光することができない。このようにして受光の有無が生じ、その受光タイミングによって、図示しないコントロールユニット等を介してシャフト２の回転角度（回転位置）、回転数及び回転速度が検出される。 When the rotating body 203 rotates, the lower portion 233 of the protrusion 232 rotates on the inner peripheral side d of the light emitting unit 205 and the light receiving unit 206 without contacting the light emitting unit 205 and the light receiving unit 206. At this time, since the reflecting surface 235 of the protruding portion 232 passes through the inner peripheral side d of the light emitting unit 205 and the light receiving unit 206 with the rotation of the rotating body 203, the light receiving unit 206 determines whether or not light is received from the light emitting unit 205. . That is, when the reflection surface 235 faces the light emitting unit 205 and the light receiving unit 206, the light receiving unit 206 receives the light from the light emitting unit 205. In addition, when a portion other than the reflection surface 235 of the lower portion 233 of the protrusion 232 faces the light emitting unit 205 and the light receiving unit 206, the light receiving unit 206 cannot receive light from the light emitting unit 205. Thus, the presence or absence of light reception is generated, and the rotation angle (rotation position), number of rotations, and rotation speed of the shaft 2 are detected by a light reception timing via a control unit (not shown) or the like.
　このようにモータ１において、回転体２０３の突出部２３２が発光部２０５及び受光部２０６の内周側ｄを通過し、受光部２０６が受光する発光部２０５からの光の受光タイミングによってシャフト２（図２参照）の回転位置を検出している。このため、シャフト２の回転に伴って変化する磁束を検出して回転位置を検出する場合と比較して、環境温度の変化が回転角度の検出精度に影響されず、回転角度を精度良く検出することができる。 As described above, in the motor 1, the protruding portion 232 of the rotating body 203 passes through the inner peripheral side d of the light emitting unit 205 and the light receiving unit 206, and the shaft 2 ( 2) is detected. Therefore, as compared with the case where the rotational position is detected by detecting the magnetic flux that changes with the rotation of the shaft 2, the change in the environmental temperature is not affected by the detection accuracy of the rotation angle, and the rotation angle is detected with high accuracy. be able to.
　なお、上述した第２の実施の形態においては、反射面２３５は、突出部２３２の外周面３２ｃに複数配置されている場合について説明したが、反射面２３５は、突出部２３２の外周面３２ｃに１個配置されていてもよい。また、突出部２３２の外周面３２ｃは、反射面であり、発光部２０５からの光を受光部２０６へ反射させない非反射面を有していてもよい。 In the above-described second embodiment, a case has been described where a plurality of reflecting surfaces 235 are arranged on the outer peripheral surface 32c of the protruding portion 232. However, the reflecting surface 235 is disposed on the outer peripheral surface 32c of the protruding portion 232. One may be arranged. Further, the outer peripheral surface 32c of the protruding portion 232 is a reflective surface, and may have a non-reflective surface that does not reflect light from the light emitting portion 205 to the light receiving portion 206.
　以上、本発明の実施の形態について説明したが、本発明は上記本発明の実施の形態に係るモータ１に限定されるものではなく、本発明の概念及び請求の範囲に含まれるあらゆる態様を含む。また、上述した課題及び効果の少なくとも一部を奏するように、各構成を適宜選択的に組み合わせてもよい。例えば、上記実施の形態における、各構成要の形状、材料、配置、サイズ等は、本発明の具体的使用態様によって適宜変更され得る。 Although the embodiment of the present invention has been described above, the present invention is not limited to the motor 1 according to the embodiment of the present invention, but includes all aspects included in the concept of the present invention and the claims. . In addition, the components may be appropriately selectively combined so as to achieve at least a part of the above-described problems and effects. For example, the shapes, materials, arrangements, sizes, and the like of the respective constituent elements in the above-described embodiment can be appropriately changed depending on the specific use mode of the present invention.
　なお、本発明の第１の実施の形態及び第２の実施の形態に係る回転体３，２０３の形状は、回転体３，２０３の突出部３２，２３２が、発光部５，２０５及び受光部６，２０６に対向することにより、受光部２０６の発光部２０５からの光の受光の有無が生じる形状であれば適宜変更が可能である。 Note that the shapes of the rotating bodies 3 and 203 according to the first and second embodiments of the present invention are such that the protruding portions 32 and 232 of the rotating bodies 3 and 203 include the light emitting units 5 and 205 and the light receiving unit. 6 and 206, the shape can be changed as appropriate as long as it has a shape in which the presence or absence of light from the light emitting unit 205 of the light receiving unit 206 occurs.
　１…モータ、２…シャフト、２ａ，２ｂ…端部、３…回転体、３ａ…上面、３ｂ…面、３ｃ…外周面、３ｄ…内周面、３ｅ…端面、４…回路基板、４ａ…回転体側の面、４ｂ…ステータ側の面、４ｃ，４ｄ…側面、５…発光部、５ａ…先端、６…受光部、６ａ…先端、７…ハウジング、７ａ…突起、７ｂ…孔、８…ロータ、９…ステータ、３０ａ…底部、３０ｂ…筒部、３１…孔部、３２…突出部、３２ａ…端面、３２ｃ…外周面、３２ｄ…内周面、３３…下側の部分、３４…上側の部分、３５…貫通孔、３６…境界、４１…孔部、４２…縁部、４３…孔部、７１…上側ハウジング、７１ａ…端面、７１ｂ…下面、７１ｃ…外周面、７２…下側ハウジング、７３…回転体側の底面、７４…回路基板側の底面、７５…孔、７６…ベース部、７７…ボス、７８…縁部、７９…孔部、７９ｈ…挿通孔、８０ａ，８０ｂ…爪、８１ａ，８１ｂ…軸受、８２…ブッシュ、８３…コア、８４…マグネット、９１…ステータコア、９２…コイル、１０３ａ…回転体、１０３ｂ…回転体、１３０ａ…端面、１３０ｂ…端面、１３２ａ…突出部、１３２ｂ…突出部、１３３ａ…下側の部分、１３３ｂ…下側の部分、１３４ａ…上側の部分、１３４ｂ…上側の部分、１３５ｂ…切り欠き部、２０３…回転体、２０５…発光部、２０５ａ…先端、２０６…受光部、２０６ａ…先端、２０７…ハウジング、２３０…端面、２３２…突出部、２３３…下側の部分、２３４…上側の部分、２３５…反射面、２３６…境界、２７１…上側ハウジング、２７１ｂ…下面、２７３…回転体側の底面、２７４…回路基板側の底面、２７５…孔、ａ…上側、ｂ…下側、ｃ…外周側、ｄ…内周側、ｅ…円周方向 DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Shaft, 2a, 2b ... End part, 3 ... Rotating body, 3a ... Upper surface, 3b ... Surface, 3c ... Outer peripheral surface, 3d ... Inner peripheral surface, 3e ... End surface, 4 ... Circuit board, 4a ... Surface on the rotating body side, 4b ... surface on the stator side, 4c, 4d ... side surface, 5 ... light emitting section, 5a ... tip, 6 ... light receiving section, 6a ... tip, 7 ... housing, 7a ... projection, 7b ... hole, 8 ... Rotor, 9 stator, 30a bottom, 30b cylindrical portion, 31 hole, 32 projecting portion, 32a end surface, 32c outer peripheral surface, 32d inner peripheral surface, 33 lower portion, 34 upper portion 35, through hole, 36, boundary, 41, hole, 42, edge, 43, hole, 71, upper housing, 71a, end surface, 71b, lower surface, 71c, outer peripheral surface, 72, lower housing 73, bottom surface on the rotating body side, 74, bottom surface on the circuit board side, 75, hole, 76, base portion, 7 ... boss, 78 ... edge, 79 ... hole, 79h ... insertion hole, 80a, 80b ... claw, 81a, 81b ... bearing, 82 ... bush, 83 ... core, 84 ... magnet, 91 ... stator core, 92 ... coil, 103a ... rotating body, 103b ... rotating body, 130a ... end face, 130b ... end face, 132a ... protruding part, 132b ... protruding part, 133a ... lower part, 133b ... lower part, 134a ... upper part, 134b ... Upper part, 135b notch, 203 rotating body, 205 light emitting part, 205a tip, 206 light receiving part, 206a tip, 207 housing, 230 end face, 232 projecting part, 233 lower Part, 234 upper part, 235 reflecting surface, 236 boundary, 271 upper housing, 271b lower surface, 273 bottom surface on the rotating body side, 274 circuit board Bottom, 275 ... hole, a ... upper, b ... lower, c ... outer circumferential side, d ... inner peripheral side, e ... circumferential direction

Claims (8)

  1. 　シャフトと、
    　前記シャフトに支持された回転体と、
    　前記シャフトの長手方向において、前記回転体に対向する面を有する回路基板と、
    　前記回路基板の前記面に設けられた発光部と、
    　前記回路基板の前記面に設けられた受光部と、を備え、
    　前記発光部と前記受光部は、径方向において、互いに離間して配置されており、
    　前記シャフトの長手方向において、前記回転体の面には突出部が設けられており、
    　前記突出部が前記シャフトの回転に伴って前記発光部と前記受光部との間を通過する、モータ。     Shaft and
    A rotating body supported by the shaft,
    A circuit board having a surface facing the rotating body in the longitudinal direction of the shaft;
    A light-emitting unit provided on the surface of the circuit board,
    A light receiving unit provided on the surface of the circuit board,
    The light emitting unit and the light receiving unit are arranged apart from each other in the radial direction,
    In the longitudinal direction of the shaft, a protrusion is provided on a surface of the rotating body,
    A motor, wherein the protruding portion passes between the light emitting portion and the light receiving portion as the shaft rotates.
  2. 　前記突出部の形状は、筒状であり、
    　前記突出部の外周面には、貫通孔が形成されている、請求項１に記載のモータ。     The shape of the protruding portion is cylindrical,
    The motor according to claim 1, wherein a through hole is formed in an outer peripheral surface of the protrusion.
  3. 　前記突出部の形状は、筒状であり、
    　前記突出部の外周面には、周方向において、所定の間隔にて複数の貫通孔が形成されている、請求項１に記載のモータ。     The shape of the protruding portion is cylindrical,
    The motor according to claim 1, wherein a plurality of through holes are formed at predetermined intervals in a circumferential direction on an outer peripheral surface of the protrusion.
  4. 　径方向に延在するベース部を有するハウジングを備え、
    　前記ベース部に前記回路基板が支持されている、請求項１乃至３のいずれか１項記載のモータ。     A housing having a base portion extending in a radial direction,
    The motor according to claim 1, wherein the circuit board is supported by the base.
  5. 　ステータを備え、
    　前記回路基板は、前記シャフトの長手方向において、前記回転体と前記ステータとの間に配置されている、請求項１乃至４のいずれか１項記載のモータ。     With a stator,
    The motor according to claim 1, wherein the circuit board is disposed between the rotating body and the stator in a longitudinal direction of the shaft.
  6. 　軸受を備え、
    　前記軸受は、径方向において、前記回転体の内側に配置されている、請求項１乃至５のいずれか１項記載のモータ。     Equipped with bearings,
    The motor according to claim 1, wherein the bearing is disposed inside the rotating body in a radial direction.
  7. 　前記突出部の形状は、円柱である、請求項１に記載のモータ。 The motor according to claim 1, wherein the shape of the protrusion is a column.
  8. 　シャフトと、
    　前記シャフトに支持された回転体と、
    　前記シャフトの長手方向において、前記回転体に対向する面を有する回路基板と、
    　前記回路基板の面に設けられた発光部と、
    　前記回路基板の前記面に設けられた受光部と、を備え、
    　前記シャフトの長手方向において、前記回転体の面には突出部が設けられており、
    　径方向において、前記発光部と前記受光部は、前記突出部の外周面に対向して配置されており、
    　前記突出部の外周面は、前記発光部から発光された光を前記受光部へ反射させる反射面を有する、モータ。     Shaft and
    A rotating body supported by the shaft,
    A circuit board having a surface facing the rotating body in the longitudinal direction of the shaft;
    A light emitting unit provided on a surface of the circuit board,
    A light receiving unit provided on the surface of the circuit board,
    In the longitudinal direction of the shaft, a protrusion is provided on a surface of the rotating body,
    In the radial direction, the light emitting unit and the light receiving unit are arranged to face an outer peripheral surface of the protruding portion,
    A motor, wherein an outer peripheral surface of the protruding portion has a reflecting surface for reflecting light emitted from the light emitting unit to the light receiving unit.
PCT/JP2019/028588 2018-07-25 2019-07-22 Motor WO2020022244A1 (en)

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US20170294824A1 (en) * 2016-04-11 2017-10-12 Bühler Motor GmbH Electric motor with rotary encoder

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JPH0518711A (en) * 1991-07-16 1993-01-26 Mitsubishi Electric Corp Position detection method and its device
JP2006246629A (en) * 2005-03-03 2006-09-14 Ricoh Co Ltd Rotating body driving device and image forming apparatus
JP2010093872A (en) * 2008-10-03 2010-04-22 Nidec Servo Corp Brushless dc motor
US20170294824A1 (en) * 2016-04-11 2017-10-12 Bühler Motor GmbH Electric motor with rotary encoder

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