motor

Abstract

The present invention provides a motor equipped with a power supply circuit board located outside the motor case, which can be miniaturized in the axial direction of the rotor even if the length of the flat circuit board is increased. [Solution] The motor 2 comprises a rotor 10 and a stator 11, a motor case 12 that houses the rotor 10 and stator 11, and a power supply circuit board 13 located outside the motor case 12. The circuit board 13 is formed in a flat plate shape that protrudes radially outward from the rotor 10. In the motor 2, because the circuit board 13 is formed in a flat plate shape that protrudes radially outward from the rotor 10, even if the length of the flat plate-shaped circuit board 13 increases, it becomes possible to miniaturize the motor 2 in the axial direction of the rotor 10.

Description

Technical Field

[0001] The present invention relates to a motor.

Background Art

[0002] Conventionally, a terminal structure of a motor used in a motor such as a stepping motor is known (see, for example, Patent Document 1). The terminal structure described in Patent Document 1 includes a substrate holder attached to a terminal opening of a motor case and a power supply terminal substrate held by the substrate holder. A terminal hole into which a terminal pin is inserted is formed in the terminal substrate, and the terminal pin inserted into the terminal hole is soldered and fixed to the terminal substrate. The substrate holder and the terminal substrate are disposed outside the motor case. The terminal substrate is formed in a substantially rectangular flat plate shape. The terminal substrate formed in a flat plate shape is arranged parallel to the axial direction of the rotor. That is, the terminal substrate is arranged such that the thickness direction of the terminal substrate coincides with the radial direction of the rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventor of the present application is developing a motor including a power supply circuit board disposed outside a motor case, such as the motor described in Patent Document 1. The circuit board is a rigid board such as a glass epoxy board and is formed in a flat plate shape. Terminal pins are electrically connected to the circuit board. A drive coil disposed inside the motor case is electrically connected to the terminal pins. The inventor of the present application is considering mounting a relatively large electronic component or a plurality of electronic components on the circuit board in the motor under development.

[0005] For example, the inventors of this application are considering mounting relatively large electronic components, such as drive ICs (Integrated Circuits), or multiple electronic components on a circuit board so that various motors can be controlled even with a single motor. To mount relatively large electronic components or multiple electronic components on a circuit board, one can increase the mounting area of ​​the circuit board by, for example, increasing the length of the flat circuit board. However, if the length of the flat circuit board is increased, there is a risk that the motor will become larger in the axial direction of the rotor.

[0006] Therefore, the object of the present invention is to provide a motor equipped with a power supply circuit board located outside the motor case, which can be miniaturized in the axial direction of the rotor even if the length of the flat circuit board is increased. [Means for solving the problem]

[0007] To solve the above problems, a motor according to one aspect of the present invention comprises a rotor and a stator, a motor case housing the rotor and stator, and a power supply circuit board disposed outside the motor case, wherein the circuit board is formed in a flat plate shape that protrudes radially outward from the rotor.

[0008] In this embodiment of the motor, the circuit board is formed in a flat plate shape that protrudes radially outward from the rotor. Therefore, in this embodiment, even if the length of the flat plate-shaped circuit board is increased, it is possible to miniaturize the motor in the axial direction of the rotor. [Effects of the Invention]

[0009] As described above, in one aspect of the present invention, in a motor equipped with a power supply circuit board located outside the motor case, it becomes possible to miniaturize the motor in the axial direction of the rotor even if the length of the flat circuit board is increased. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of a motor according to an embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the motor shown in Figure 1. [Figure 3] Figure 3 is a perspective view of the bobbin shown in Figure 2. [Figure 4] Figure 4 is a plan view of the motor shown in Figure 1 with the second cover member removed. [Figure 5] Figure 5 is a perspective view showing the first cover member shown in Figure 1 from a different direction. [Figure 6] Figure 6 is a perspective view showing the second cover member shown in Figure 1 from a different direction. [Figure 7] Figure 7 is a plan view illustrating the configuration of the mounting portion of the first cover member to the motor case shown in Figure 1. [Figure 8] Figure 8 is a perspective view illustrating the configuration of the mounting portion of the second cover member to the bobbin shown in Figure 2. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings.

[0012] (Overall motor configuration) Figure 1 is a perspective view of a motor 2 according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the motor 2 shown in Figure 1. Figure 3 is a perspective view of the bobbin 24 shown in Figure 2.

[0013] The motor 2 in this embodiment is a geared motor. The motor 2 comprises a motor body 3 and a reduction gear mechanism 4. The reduction gear mechanism 4 comprises a rotating shaft 5 which serves as the output shaft of the motor 2 and a reduction gear train 6. The reduction gear train 6 comprises multiple gears. The motor body 3 is a stepping motor. Specifically, the motor body 3 is a so-called PM type stepping motor. Furthermore, the motor body 3 is a two-phase stepping motor. The motor body 3 comprises a rotor 10 having a drive magnet 9 and a stator 11 positioned on the outer circumference of the drive magnet 9.

[0014] Furthermore, the motor 2 includes a motor case 12 that houses the rotor 10 and stator 11, a power supply circuit board 13 located outside the motor case 12, and a cover member 14 that covers the circuit board 13. In the following description, the axial direction of the rotor 10 (Z direction in Figure 1, etc.) will be referred to as the "up-down direction," the Y direction in Figure 1, etc., which is perpendicular to the up-down direction, will be referred to as the "left-right direction," and the X direction in Figure 1, etc., which is perpendicular to both the up-down and left-right directions, will be referred to as the "front-back direction." The left-right direction is the radial direction of the rotor 10, perpendicular to the axial direction of the rotor 10. The front-back direction is also the radial direction of the rotor 10, perpendicular to the axial direction of the rotor 10. The up-down direction is also the axial direction of the rotation axis 5.

[0015] Furthermore, in the following explanation, the side in the Z1 direction as shown in Figure 1, which is one side in the vertical direction, will be referred to as the "upper" side, the side in the Z2 direction as shown in Figure 1, which is the opposite side of the upper side, will be referred to as the "lower" side, the side in the Y1 direction as shown in Figure 1, which is one side in the horizontal direction, will be referred to as the "right" side, and the side in the Y2 direction as shown in Figure 1, which is the opposite side of the right side, will be referred to as the "left" side. In this embodiment, the upper side (Z1 direction side) is the first direction side, which is one side in the axial direction of the rotor 10, and the lower side (Z2 direction side) is the second direction side, which is the opposite side of the first direction side (the other side in the axial direction of the rotor 10). Also, in this embodiment, the upper side is the output side of the motor 2, and the lower side is the non-output side of the motor 2.

[0016] As described above, the motor body 3 comprises a rotor 10 and a stator 11. The rotor 10 has a rotating shaft 16 to which the drive magnet 9 is fixed. The rotating shaft 16 is formed in a cylindrical shape. A fixed shaft 17 is positioned on the inner circumference side of the rotating shaft 16. The fixed shaft 17 is positioned so that its axial direction coincides with its vertical direction. The lower end of the fixed shaft 17 is held to the bottom (lower surface) of the motor case 12. The upper end of the fixed shaft 17 is held to the end plate 27, which will be described later.

[0017] The rotating shaft 16 rotates with the vertical direction as the axial direction of rotation. The upper end side portion of the rotating shaft 16 is an output shaft 16b that protrudes upward from the stator 11. The reduction gear train 6 is connected to the output shaft 16b. The drive magnet 9 is a permanent magnet and is formed in a substantially cylindrical shape. The drive magnet 9 is fixed to the outer peripheral surface of the lower end side portion of the rotating shaft 16. On the outer peripheral surface of the drive magnet 9, N poles and S poles are alternately formed along the circumferential direction of the rotor 10.

[0018] The stator 11 includes a stator portion 18 of phase A and a stator portion 19 of phase B that overlap in the vertical direction. The stator portion 18 is disposed above the stator portion 19. The stator portion 18 is disposed on the outer peripheral side of the upper end side portion of the drive magnet 9, and the stator portion 19 is disposed on the outer peripheral side of the lower end side portion of the drive magnet 9. The stator portion 18 includes a drive coil 20 and a stator core 21. The stator portion 19 includes a drive coil 22 and a stator core 23. The reduction gear train 6 is disposed above the stator 11 and the drive magnet 9.

[0019] The drive coil 20 is wound around a bobbin 24, and the drive coil 22 is wound around a bobbin 25. That is, the stator 11 includes bobbins 24 and 25. A plurality of pole teeth facing the outer peripheral surface of the drive magnet 9 are formed on the stator cores 21 and 23. The drive coil 20 and the bobbin 24 are disposed outside the plurality of pole teeth of the stator core 21 in the radial direction of the rotor 10. The drive coil 22 and the bobbin 25 are disposed outside the plurality of pole teeth of the stator core 23 in the radial direction of the rotor 10.

[0020] The stator core 21 is composed of an outer stator core having a disk-shaped end plate portion disposed above the drive coil 20 and an inner stator core having a disk-shaped end plate portion disposed below the drive coil 20. The stator core 23 is composed of an outer stator core having a disk-shaped end plate portion disposed below the drive coil 22 and an inner stator core having a disk-shaped end plate portion disposed above the drive coil 22.

[0021] The stator 11 also has a plurality of terminal pins 26 to which the drive coils 20 and 22 are electrically connected. In this embodiment, the stator 11 has five terminal pins 26. A terminal block 24b is formed on the bobbin 24 to hold the five terminal pins 26. The terminal block 24b is formed at the upper right end of the bobbin 24. The terminal block 24b is formed in the shape of a rectangular parallelepiped that protrudes to the right. The terminal block 24b is also formed in the shape of a rectangular parallelepiped that is elongated in the front-to-back direction. The five terminal pins 26 held by the terminal block 24b are arranged with a certain distance between them in the front-to-back direction. The terminal pins 26 are electrically connected to the circuit board 13. The specific configuration of the terminal pins 26 will be described later.

[0022] As shown in Figure 3, the bobbin 24 has an engaging portion 24c formed therein, which engages with a second cover member 37, described later, that constitutes part of the cover member 14. The engaging portion 24c is formed in a flat plate shape with the left-right direction as the thickness direction. There are two engaging portions 24c. The engaging portions 24c are located to the left of the terminal block 24b. Also, the two engaging portions 24c are located outside the terminal block 24b in the front-rear direction. The terminal block 24b and the engaging portions 24c are connected by a connecting portion 24d. The outer surface of the connecting portion 24d in the front-rear direction is a plane perpendicular to the front-rear direction.

[0023] The motor case 12 is formed in a cylindrical shape with a bottom that opens at the top. In this embodiment, the motor case 12 is formed integrally with the outer stator core of the stator core 23. The end plate portion of the outer stator core of the stator core 23 constitutes the bottom (lower surface) of the motor case 12. The motor case 12 constitutes the outer circumferential surface of the motor body 3 and the outer circumferential surface of the motor 2. The motor case 12 also houses the reduction gear train 6 and the lower end portion of the rotating shaft 5. Note that the motor case 12 may be formed separately from the outer stator core of the stator core 23. In this case, for example, the end plate portion of the outer stator core of the stator core 23 is positioned above the bottom of the motor case 12.

[0024] The motor case 12 has an opening 12b that is recessed downward from the upper end surface of the motor case 12 and penetrates the motor case 12 in the radial direction of the rotor 10. The opening 12b is formed at the right end of the motor case 12. When viewed from the right side, the outer shape of the opening 12b is rectangular. An end plate 27 is fixed to the upper end of the motor case 12. That is, the motor 2 is equipped with an end plate 27 fixed to the upper end of the motor case 12.

[0025] The end plate 27 is formed in a flat shape with its thickness in the vertical direction. The upper surface of the end plate 27 is a plane perpendicular to the vertical direction. The upper part of the rotating shaft 5 protrudes above the upper surface of the end plate 27. The end plate 27 has two mounting parts 27b that protrude toward both sides in the front-rear direction. The mounting parts 27b have round through holes 27c that penetrate the mounting parts 27b in the vertical direction. The upper surface of the mounting parts 27b is a planar mounting surface 27d for attaching the motor 2 to a predetermined higher device. The mounting surface 27d is perpendicular to the vertical direction. The mounting surface 27d faces upward. The mounting surface 27d is positioned slightly above the upper surface of the part of the end plate 27 other than the mounting parts 27b. Part of a screw for attaching the motor 2 to the higher device is positioned in the through hole 27c.

[0026] (Configuration of circuit board, cover member, and terminal pins) Figure 4 is a plan view of the motor 2 shown in Figure 1 with the second cover member 37 removed. Figure 5 is a perspective view of the first cover member 36 shown in Figure 1 from a different direction. Figure 6 is a perspective view of the second cover member 37 shown in Figure 1 from a different direction. Figure 7 is a plan view illustrating the configuration of the mounting portion of the first cover member 36 to the motor case 12 shown in Figure 1. Figure 8 is a perspective view illustrating the configuration of the mounting portion of the second cover member 37 to the bobbin 24 shown in Figure 2.

[0027] The circuit board 13 serves the function of supplying power to the drive coils 20 and 22. The circuit board 13 is a rigid substrate such as a glass epoxy substrate. The circuit board 13 is formed in a flat plate shape that protrudes radially outward from the rotor 10. In this embodiment, the circuit board 13 is formed in a flat plate shape that protrudes to the right. The thickness direction of the circuit board 13 coincides with the vertical direction. The circuit board 13 is formed in a rectangular flat plate shape with the left-right direction as the longer side. The circuit board 13 extends to the right from the outer circumferential surface of the motor case 12. The circuit board 13 is located to the right of the reduction gear train 6. The circuit board 13 is located at the same position as the lower end of the reduction gear train 6 in the vertical direction.

[0028] The circuit board 13 has a substrate-side engaging portion 13b that protrudes outward in the front-to-back direction (see Figure 4). The substrate-side engaging portion 13b is formed at two locations on both sides of the circuit board 13 in the front-to-back direction. The substrate-side engaging portion 13b is formed over a relatively wide area in the left-to-right direction. Both end faces of the substrate-side engaging portion 13b in the left-to-right direction are planes perpendicular to the left-to-right direction. The right end face of the substrate-side engaging portion 13b is positioned to the left of the right end face of the circuit board 13. The left end face of the substrate-side engaging portion 13b is positioned to the right of the left end face of the circuit board 13. The substrate-side engaging portion 13b is formed in an elongated rectangular shape with the left-to-right direction as the longer side.

[0029] The circuit board 13 has multiple pin placement holes 13c formed therein, where some of the terminal pins 26 are placed (see Figure 2). In this embodiment, five pin placement holes 13c are formed. The pin placement holes 13c are round holes that penetrate the circuit board 13 in the vertical direction. The five pin placement holes 13c are formed at the left end of the circuit board 13. The five pin placement holes 13c are arranged with a constant spacing in the front-to-back direction.

[0030] As shown in Figure 2, the terminal pin 26 comprises a retained portion 26b held by the terminal block 24b, a board connection portion 26c connected to the circuit board 13, and a coil fixing portion 26d to which the ends of the drive coils 20 and 22 are fixed. In this embodiment, the terminal pin 26 is composed of a retained portion 26b, a board connection portion 26c, and a coil fixing portion 26d. The retained portion 26b is formed in a straight line extending in the left-right direction. The right end of the retained portion 26b is located to the right of the terminal block 24b, and the left end of the retained portion 26b is located to the right of the terminal block 24b. The retained portion 26b is located below the circuit board 13.

[0031] The board connection portion 26c is formed in a straight line extending upward from the right end of the held portion 26b. The board connection portion 26c is inserted from below into the pin placement hole 13c of the circuit board 13. That is, a portion of the terminal pin 26 is inserted from below into the pin placement hole 13c. The upper end of the board connection portion 26c is positioned above the upper surface of the circuit board 13. The board connection portion 26c is soldered and fixed to the circuit board 13 on the upper surface side of the circuit board 13. The coil fixing portion 26d is formed in a straight line extending diagonally upward from the left end of the held portion 26b. The ends of the drive coils 20 and 22 are soldered and fixed to the coil fixing portion 26d in a state where they are intertwined.

[0032] A connector 31 is mounted on the circuit board 13. The connector 31 is mounted on the upper surface of the right end of the circuit board 13. The socket of the connector 31 faces to the right. The mating connector 32 is inserted into the connector 31 from the right side. Also, the mating connector 32 inserted into the connector 31 is pulled out towards the right. In other words, the mating connector 32 is inserted into and removed from the connector 31 in the radial direction of the rotor 10.

[0033] Furthermore, multiple electronic components 33 and 34 are mounted on the circuit board 13. For example, one driver IC is mounted on the circuit board 13 as an electronic component 33. In addition, multiple electronic components 34 other than the driver IC are mounted on the circuit board 13. The electronic components 33 and 34 are mounted on the top surface of the circuit board 13. Some or all of the electronic components 33 and 34 may be mounted on the bottom surface of the circuit board 13.

[0034] The cover member 14 protrudes to the right from the motor case 12. That is, the cover member 14 protrudes from the motor case 12 radially outward from the rotor 10. The cover member 14 is formed in an elongated rectangular tube shape in the left-right direction, and both ends of the cover member 14 in the left-right direction are open. The cover member 14 covers the circuit board 13 from both sides in the vertical direction and both sides in the front-back direction. The left end of the cover member 14 engages with the opening 12b of the motor case 12. That is, the inner end of the cover member 14 in the radial direction of the rotor 10 engages with the opening 12b.

[0035] The cover member 14 comprises a first cover member 36 and a second cover member 37, which are divided vertically. In this embodiment, the cover member 14 is composed of the first cover member 36 and the second cover member 37. The second cover member 37 is positioned above the first cover member 36. The second cover member 37 is attached to the first cover member 36 from above. The left-right length of the first cover member 36 and the left-right length of the second cover member 37 are approximately equal. In this embodiment, the second cover member 37 is fixed to the first cover member 36 by a snap fit.

[0036] The first cover member 36 consists of a cover body 36b that houses the circuit board 13 and a case engagement portion 36c that engages with the motor case 12. The cover body 36b is formed in a rectangular groove shape with openings on its top surface and both ends in the left-right direction. On the front-rear side surface of the cover body 36b, a cover-side engagement portion 36d is formed, which is recessed from the inner surface in the front-rear direction toward the outside in the front-rear direction and recessed from the top surface toward the bottom of the side surface. Both sides of the cover-side engagement portion 36d in the left-right direction are planes perpendicular to the left-right direction. The bottom surface of the cover-side engagement portion 36d is a plane perpendicular to the up-down direction.

[0037] The circuit board side engaging portion 13b of the circuit board 13 is positioned on the cover side engaging portion 36d. The lower surface of the circuit board side engaging portion 13b is in contact with the lower surface of the cover side engaging portion 36d. The right end surface of the circuit board side engaging portion 13b is in light contact with the right side of the cover side engaging portion 36d, or they are facing each other with a small gap between them. The left end surface of the circuit board side engaging portion 13b is in light contact with the left side of the cover side engaging portion 36d, or they are facing each other with a small gap between them.

[0038] The cover-side engaging portion 36d serves to restrict the movement of the circuit board 13 relative to the cover member 14 in the left-right direction. That is, the cover member 14 has a cover-side engaging portion 36d formed thereon to restrict the movement of the circuit board 13 in the left-right direction, which is the insertion and removal direction of the mating connector 32. The board-side engaging portion 13b engages with the cover-side engaging portion 36d. The lower surface of the cover-side engaging portion 36d is a first contact surface 36e that contacts the lower surface of the circuit board 13. That is, the first cover member 36 has a first contact surface 36e formed thereon.

[0039] The case engagement portion 36c protrudes downward from the left end of the cover body 36b. The case engagement portion 36c has a curved plate-shaped outer mounting portion 36f that is positioned on the outside of the outer peripheral surface of the motor case 12, and a curved plate-shaped inner mounting portion 36g that is positioned on the inside of the inner peripheral surface of the motor case 12. The outer mounting portion 36f and the inner mounting portion 36g are formed on both sides of the case engagement portion 36c in the front-rear direction. The inner mounting portion 36g is positioned to the left and below the outer mounting portion 36f.

[0040] The outer mounting portion 36f and the inner mounting portion 36g are positioned to sandwich the motor case 12 at the edge of the opening 12b. The side surface (front-rear side) of the case engagement portion 36c between the outer mounting portion 36f and the inner mounting portion 36g is either in light contact with the side surface (front-rear side) of the opening 12b or faces it with a small gap between them. The lower surface of the case engagement portion 36c, which is positioned to the right of the inner mounting portion 36g, is in contact with the lower surface of the opening 12b.

[0041] The second cover member 37 has protrusions 37b that project downwards at both ends in the front-rear direction. The protrusions 37b are formed in the shape of an elongated rectangular parallelepiped in the left-right direction. The protrusions 37b are positioned above the cover-side engaging portion 36d. The lower surface of the protrusions 37b is a plane perpendicular to the vertical direction. The lower surface of the protrusions 37b is a second contact surface 37c that contacts the upper surface of the circuit board 13. In other words, the second cover member 37 has a second contact surface 37c that contacts the upper surface of the circuit board 13.

[0042] The second cover member 37 is provided with a terminal block engaging portion 37d that engages with the terminal block 24b. The terminal block engaging portion 37d protrudes downward from the left end of the second cover member 37. The terminal block engaging portion 37d is formed at two locations in the front-rear direction of the second cover member 37. The terminal block engaging portion 37d has a bobbin contact portion 37e that contacts the engaging portion 24c of the bobbin 24 from the right side, and a bobbin contact portion 37f that contacts the engaging portion 24c from the left side.

[0043] The inner surface of the bobbin contact portion 37e in the front-rear direction is a plane perpendicular to the front-rear direction and is positioned outside the front-rear outer surface of the connecting portion 24d in the front-rear direction. The connecting portion 37g that connects the bobbin contact portion 37e and the bobbin contact portion 37f is positioned outside the engaging portion 24c in the front-rear direction. The right side of the bobbin contact portion 37e of the second cover member 37 is positioned inside the opening 12b of the motor case 12.

[0044] An elastically deformable engaging piece 37h is formed at the right end of the second cover member 37, which snaps into place with the first cover member 36. The engaging piece 37h is formed at two locations on the second cover member 37 in the front-rear direction. The engaging piece 37h is elastically deformable in the front-rear direction. The upper surface 37k of the second cover member 37 is a plane perpendicular to the vertical direction. The upper surface 37k of the second cover member 37 is on the same plane as the mounting surface 27d of the end plate 27. That is, the upper surface 37k, which is the upper surface of the cover member 14, is a plane that is on the same plane as the mounting surface 27d.

[0045] When assembling motor 2, the stator section 19 is placed in the motor case 12 from above, then the first cover member 36 is attached to the motor case 12 from above, and then the stator section 18 with the terminal pins 26 attached is placed in the motor case 12 from above. After that, the circuit board 13 is placed inside the first cover member 36 from above. At this time, the board connection portion 26c of the terminal pins 26 is inserted into the pin arrangement hole 13c of the circuit board 13. After that, the circuit board 13 and the board connection portion 26c are soldered and fixed from above. After that, the second cover member 37 is attached to the first cover member 36 from above.

[0046] (Main effects of this form) As explained above, in this embodiment, the circuit board 13 is formed in a flat plate shape that protrudes radially outward from the rotor 10. Therefore, in this embodiment, even if the length of the flat plate-shaped circuit board 13 is increased, it is possible to miniaturize the motor 2 in the axial direction of the rotor 10.

[0047] In this embodiment, the motor 2 is equipped with a cover member 14 that covers the circuit board 13. Therefore, in this embodiment, the electronic components 33 and 34 mounted on the circuit board 13 can be protected by the cover member 14. Consequently, in this embodiment, it is possible to prevent damage to the electronic components 33 and 34 mounted on the circuit board 13.

[0048] In this embodiment, the cover member 14 has a cover-side engaging portion 36d that restricts the movement of the circuit board 13 in the left-right direction, which is the direction in which the mating connector 32 is inserted into and removed from the connector 31, and the circuit board 13 has a board-side engaging portion 13b that engages with the cover-side engaging portion 36d. Therefore, in this embodiment, the cover member 14 can receive the force acting on the circuit board 13 when the mating connector 32 is inserted into and removed from the connector 31. Consequently, in this embodiment, it is possible to prevent damage to the connection portion between the circuit board 13 and the terminal pins 26 due to the insertion and removal of the mating connector 32. Furthermore, in this embodiment, the circuit board 13 can be positioned in the left-right direction relative to the cover member 14 by the board-side engaging portion 13b and the cover-side engaging portion 36d.

[0049] In this embodiment, the first cover member 36 has a first contact surface 36e that contacts the lower surface of the circuit board 13, and the second cover member 37 has a second contact surface 37c that contacts the upper surface of the circuit board 13. Therefore, in this embodiment, the circuit board 13 can be positioned in the axial direction of the rotor 10 using the first cover member 36 and the second cover member 37.

[0050] In this embodiment, the motor case 12 has an opening 12b that is recessed downward from the upper end surface of the motor case 12, and the left end of the cover member 14 engages with the opening 12b. In addition, in this embodiment, the second cover member 37 is positioned above the first cover member 36 and is attached to the first cover member 36 from above. Furthermore, in this embodiment, the circuit board 13 has a pin placement hole 13c that penetrates the circuit board 13 in the vertical direction, and a portion of the terminal pin 26 is inserted into the pin placement hole 13c from below.

[0051] Therefore, in this embodiment, as described above, when assembling the motor 2, the stator section 19, the first cover member 36, the stator section 18, the circuit board 13, and the second cover member 37 can be attached to the motor case 12 sequentially from the top in this order. Thus, in this embodiment, the assembly of the motor 2 can be easily performed.

[0052] In this embodiment, the mounting surface 27d for attaching the motor 2 to the upper device and the upper surface 37k of the cover member 14 are arranged on the same plane that is perpendicular in the vertical direction. Therefore, in this embodiment, it is possible to stabilize the state of the motor 2 when it is attached to the upper device.

[0053] (Other embodiments) The above-described embodiments are examples of preferred embodiments of the present invention, but are not limited thereto, and various modifications can be made without altering the essence of the invention.

[0054] In the above-described configuration, the circuit board 13 may be positioned below the reduction gear train 6. In this case, for example, the board connection portion 26c of the terminal pin 26 is formed in a straight line extending downward from the right end of the retained portion 26b, and is inserted from above into the pin arrangement hole 13c of the circuit board 13. In this case, the upper surface 37k of the second cover member 37 may be positioned below the mounting surface 27d. Furthermore, in the above-described configuration, the second cover member 37 does not have a terminal block engagement portion 37d. That is, the second cover member 37 does not need to be engaged with the bobbin 24.

[0055] In the above-described configuration, the circuit board 13 may have a recess formed therein as a board-side engaging portion that recesses inward in the front-rear direction, and the first cover member 36 may have a protrusion formed therein as a cover-side engaging portion that protrudes inward in the front-rear direction from the inner surface of the front-rear side portion of the cover body 36b. In this case, the protrusion of the first cover member 36 engages with the recess of the circuit board 13, and the movement of the circuit board 13 relative to the cover member 14 in the left-right direction is restricted by the recess and the protrusion (i.e., by the board-side engaging portion and the cover-side engaging portion).

[0056] In the above-described configuration, the second cover member 37 may be attached to the first cover member 36 from the right side. In this case, the second cover member 37 does not have a terminal block engaging portion 37d. In this case, for example, a restricting surface may be formed on the first cover member 36 that lightly contacts or has a small gap between it and the left end surface of the substrate-side engaging portion 13b, and a restricting surface may be formed on the second cover member 37 that lightly contacts or has a small gap between it and the right end surface of the substrate-side engaging portion 13b. In this case, the restricting surface of the first cover member 36 and the restricting surface of the second cover member 37 constitute a cover-side engaging portion that restricts the movement of the circuit board 13 in the left-right direction.

[0057] In this case, the first contact surface that contacts the lower surface of the circuit board 13 and the second contact surface that contacts the upper surface of the circuit board 13 may be formed on the first cover member 36, or the first contact surface and the second contact surface may be formed on the second cover member 37. In this case, the length of the first cover member 36 in the left-right direction may be shorter than the length of the second cover member 37 in the left-right direction.

[0058] In the above-described embodiment, the circuit board 13 does not necessarily have a board-side engaging portion 13b. In this case, the cover member 14 does not have a cover-side engaging portion 36d. Also, in the above-described embodiment, the cover member 14 is composed of two members, a first cover member 36 and a second cover member 37, but the cover member 14 may be composed of a single member. Furthermore, in the above-described embodiment, the motor 2 does not necessarily have a cover member 14.

[0059] In the above-described configuration, the thickness direction of the circuit board 13 may be inclined with respect to the vertical direction. Specifically, the thickness direction of the circuit board 13 may be slightly inclined with respect to the vertical direction. Even in this case, the circuit board 13 protrudes radially outward from the rotor 10. Furthermore, in the above-described configuration, the motor body 3 may be a motor other than a stepping motor. Moreover, in the above-described configuration, the motor 2 does not have to be a geared motor. That is, the motor 2 does not have to be equipped with a reduction gear mechanism 4.

[0060] (Configuration of this technology) Furthermore, this technology can be configured as follows: (1) comprising a rotor and a stator, a motor case housing the rotor and the stator, and a power supply circuit board located outside the motor case, The motor is characterized in that the circuit board is formed in the shape of a flat plate that protrudes radially outward from the rotor. (2) The motor according to (1), characterized in that the thickness direction of the circuit board coincides with the axial direction of the rotor. (3) The motor according to (1) or (2), characterized by comprising a cover member that covers the circuit board. (4) A connector is mounted on the circuit board, The connector is inserted into and removed from the mating connector in the radial direction of the rotor. The cover member is formed with a cover-side engaging portion for restricting the movement of the circuit board in the insertion / removal direction of the mating connector. The motor according to (3), characterized in that the circuit board has a board-side engaging portion that engages with the cover-side engaging portion. (5) The cover member comprises a first cover member and a second cover member that are divided in the axial direction of the rotor, The first cover member has a first contact surface that contacts one surface of the circuit board in the axial direction of the rotor. The motor according to (3) or (4), characterized in that the second cover member has a second contact surface formed thereon that contacts the other surface of the circuit board in the axial direction of the rotor. (6) The thickness direction of the circuit board coincides with the axial direction of the rotor, If one side of the rotor in the axial direction is designated as the first direction side, and the other side of the rotor in the axial direction opposite to the first direction side is designated as the second direction side, The stator comprises a drive coil and a plurality of terminal pins to which the drive coil is electrically connected. The cover member comprises a first cover member and a second cover member that are divided in the axial direction of the rotor. The motor case has an opening formed therein that is recessed from the end face on the first direction side toward the second direction side and penetrates the motor case in the radial direction of the rotor. The inner end of the cover member in the radial direction of the rotor engages with the opening. The second cover member is positioned on the first direction side of the first cover member and is attached to the first cover member from the first direction side. The circuit board has a plurality of pin arrangement holes formed therein, where some of the terminal pins are arranged. The aforementioned pin arrangement holes penetrate the circuit board in the axial direction of the rotor, The motor according to any one of (3) to (5), characterized in that a portion of the terminal pins is inserted into the pin arrangement holes from the second direction side. (7) If one side of the rotor in the axial direction is designated as the first direction side, The motor has a flat mounting surface formed for attaching it to a higher-level device, and is provided with an end plate that is fixed to the first-direction end of the motor case, The mounting surface is perpendicular to the axial direction of the rotor and faces the first direction. The motor according to any one of (3) to (6), characterized in that the surface of the cover member on the first direction side is a plane that is arranged on the same plane as the mounting surface.

[0061] In this technology, for example, the thickness direction of the circuit board coincides with the axial direction of the rotor.

[0062] In this technology, it is preferable that the motor includes a cover member that covers the circuit board. With this configuration, it becomes possible to protect the electronic components mounted on the circuit board with the cover member. Therefore, it becomes possible to prevent damage to the electronic components mounted on the circuit board.

[0063] In this technology, it is preferable that a connector is mounted on the circuit board, a mating connector is inserted into and removed from the connector in the radial direction of the rotor, a cover member has a cover-side engaging portion for restricting the movement of the circuit board in the insertion / removal direction of the mating connector, and the circuit board has a board-side engaging portion that engages with the cover-side engaging portion. With this configuration, the cover member can receive the force acting on the circuit board when the mating connector is inserted into and removed from the connector. Therefore, it is possible to prevent damage to the connection portion (the portion that is soldered and fixed) between the power supply circuit board and the terminal pins due to the insertion and removal of the mating connector. Furthermore, with this configuration, it is possible to position the circuit board relative to the cover member in the insertion / removal direction of the mating connector by means of the board-side engaging portion and the cover-side engaging portion.

[0064] In this technology, for example, the cover member comprises a first cover member and a second cover member that are divided in the axial direction of the rotor. The first cover member has a first contact surface that contacts one surface of the circuit board in the axial direction of the rotor, and the second cover member has a second contact surface that contacts the other surface of the circuit board in the axial direction of the rotor. In this case, the circuit board can be positioned in the axial direction of the rotor using the first cover member and the second cover member.

[0065] In this technology, the thickness direction of the circuit board coincides with the axial direction of the rotor, one side in the axial direction of the rotor is designated as the first direction side, and the other side in the axial direction of the rotor opposite to the first direction side is designated as the second direction side. The stator comprises a drive coil and a plurality of terminal pins to which the drive coil is electrically connected. The cover member comprises a first cover member and a second cover member divided in the axial direction of the rotor. The motor case has an opening formed therein that is recessed from the end face on the first direction side toward the second direction side and penetrates the motor case in the radial direction of the rotor. The inner end of the cover member in the radial direction of the rotor engages with the opening. The second cover member is positioned on the first direction side of the first cover member and is attached to the first cover member from the first direction side. The circuit board has a plurality of pin placement holes in which a portion of the terminal pins are placed. The pin placement holes penetrate the circuit board in the axial direction of the rotor, and it is preferable that a portion of the terminal pins are inserted into the pin placement holes from the second direction side.

[0066] With this configuration, the stator can be housed in the motor case from the first direction side, the first cover member can be attached from the first direction side, the circuit board can be placed inside the first cover member from the first direction side, and then the circuit board and terminal pins can be soldered and fixed from the first direction side. Furthermore, the second cover member can then be attached to the first cover member from the first direction side. Therefore, the motor can be assembled easily.

[0067] In this technology, if one side of the rotor in the axial direction is designated as the first direction side, the motor is provided with an end plate that is fixed to the first direction side end of the motor case and has a planar mounting surface for attaching the motor to a higher-level device. Preferably, the mounting surface is perpendicular to the axial direction of the rotor and faces the first direction side, and the first direction side surface of the cover member is a plane that is coplanar with the mounting surface. With this configuration, it becomes possible to stabilize the state of the motor when it is attached to a higher-level device. [Explanation of symbols]

[0068] 2 motors 10 rotors 11 stata 12 Motor Case 12b opening 13 Circuit board 13b Substrate-side engagement portion 13c pin configuration holes 14 Cover component 20, 22 Drive coils 26 terminal pins 27 End plate 27d Mounting surface 31 Connectors 32. Mating connector 36. First cover member 36d Cover-side engaging portion 36e 1st contact surface 37. Second cover member 37c 2nd contact surface 37k Upper surface of the second cover member (the surface of the cover member on the first direction side) Y Direction of insertion / removal of the mating connector Z rotor axial direction Z1 1st direction side Z2 2nd direction side

Claims

1. The motor comprises a rotor and a stator, a motor case housing the rotor and the stator, and a power supply circuit board located outside the motor case. The motor is characterized in that the circuit board is formed in the shape of a flat plate that protrudes radially outward from the rotor.

2. The motor according to claim 1, characterized in that the thickness direction of the circuit board coincides with the axial direction of the rotor.

3. The motor according to claim 1 or 2, characterized in that it includes a cover member that covers the circuit board.

4. The aforementioned circuit board has a connector mounted on it. The connector is connected to and disconnected from the mating connector in the radial direction of the rotor. The cover member is formed with a cover-side engaging portion for restricting the movement of the circuit board in the insertion / removal direction of the mating connector. The motor according to claim 3, characterized in that the circuit board has a board-side engaging portion that engages with the cover-side engaging portion.

5. The cover member comprises a first cover member and a second cover member that are divided in the axial direction of the rotor. The first cover member has a first contact surface that contacts one surface of the circuit board in the axial direction of the rotor. The motor according to claim 3, characterized in that the second cover member has a second contact surface formed thereon that contacts the other surface of the circuit board in the axial direction of the rotor.

6. The thickness direction of the circuit board coincides with the axial direction of the rotor. If one side of the rotor in the axial direction is designated as the first direction side, and the other side of the rotor in the axial direction opposite to the first direction side is designated as the second direction side, The stator comprises a drive coil and a plurality of terminal pins to which the drive coil is electrically connected. The cover member comprises a first cover member and a second cover member that are divided in the axial direction of the rotor. The motor case has an opening formed therein that is recessed from the end face on the first direction side toward the second direction side and penetrates the motor case in the radial direction of the rotor. The inner end of the cover member in the radial direction of the rotor engages with the opening. The second cover member is positioned on the first direction side of the first cover member and is attached to the first cover member from the first direction side. The circuit board has a plurality of pin arrangement holes formed therein, where some of the terminal pins are arranged. The aforementioned pin arrangement holes penetrate the circuit board in the axial direction of the rotor, The motor according to claim 3, characterized in that a portion of the terminal pins is inserted into the pin arrangement holes from the second direction side.

7. If one side of the rotor in the axial direction is designated as the first direction side, The motor has a flat mounting surface formed for attaching it to a higher-level device, and is provided with an end plate that is fixed to the end of the motor case on the first direction side, The mounting surface is perpendicular to the axial direction of the rotor and faces the first direction. The motor according to claim 3, characterized in that the surface of the cover member on the first direction side is a plane that is arranged on the same plane as the mounting surface.

Images