Motor

Abstract

To reduce weight and noise.SOLUTION: A motor comprises a rotor, a stator, a first substrate, and a second substrate provided with electronic components. The stator has a stator core, an insulator, and a coil wound around the stator core via the insulator. The insulator comprises a coupling part coupled with an external device. The first substrate is fixed to the insulator. The second substrate is fixed to the first substrate. The first and second substrates are separated from each other in a rotation axis direction of the rotor.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] 2. Description of the Related Art In order to meet the demands for longer life and lower noise in motors that run on alternating current (AC) power sources, a technique is known that uses a brushless motor equipped with an AC-DC converter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-128432 A [Patent Document 2] JP 2015-95920 A [Patent Document 3] Japanese Patent Application Publication No. 08-140325 [Patent Document 4] JP 2019-83611 A Summary of the Invention [Problem to be solved by the invention]

[0004] DC motors equipped with AC-DC converters also need to be made lighter and more compact.

[0005] One object of the present invention is to provide a motor that can achieve light weight and low noise. [Means for solving the problem]

[0006] In one embodiment, the motor includes a rotor, a stator, a first substrate, and a second substrate on which electronic components are provided. , and the housingThe stator includes a stator core, an insulator, and a coil wound around the stator core via the insulator. The insulator includes a connecting portion for connecting to an external device. The first substrate is fixed to the insulator. The second substrate is fixed to the first substrate, and the first substrate and the second substrate are spaced apart in the direction of the rotation axis of the rotor. Wind passes through a first annular space formed by the outer periphery of the first substrate and the outer periphery of the second substrate and the inner surface of the housing, and a second space formed by a component having the stator and the rotor and the inner surface of the housing. In another aspect, a motor includes a rotor, a stator, a first board, a second board on which electronic components are provided, and a housing. The stator includes a stator core, an insulator, and a coil wound around the stator core via the insulator. The first board is fixed to the stator. The second board is fixed to the first board, and the first board and the second board are spaced apart in the direction of the rotation axis of the rotor. Wind passes through an annular first space formed by the outer periphery of the first board, the outer periphery of the second board, and the inner surface of the housing, and a second space formed by a component having the stator and the rotor and the inner surface of the housing.

[0007] According to one embodiment, weight reduction and noise reduction can be achieved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating an example of a motor according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view illustrating an example of a motor according to the first embodiment. [Diagram 3] FIG. 3 is a perspective view of the motor according to the first embodiment with a housing removed. [Figure 4] FIG. 4 is a perspective view illustrating an example of an insulator according to the first embodiment. [Diagram 5] FIG. 5 is a bottom view illustrating an example of the motor according to the first embodiment. [Figure 6] FIG. 6 is an enlarged cross-sectional view showing an example of the motor according to the first embodiment. [Figure 7] FIG. 7 is a perspective view illustrating an example of a housing in the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the motor disclosed in the present application will be described in detail below with reference to the drawings. Note that the dimensional relationships of the elements in the drawings, the ratios of the elements, etc. may differ from reality. The drawings may also include parts in which the dimensional relationships and ratios of the elements differ. To facilitate understanding of the description, each drawing may show a coordinate system including at least one of the axial direction (the direction of the rotational axis of the motor 1), radial direction, and circumferential direction of the motor 1, which will be described later. In the following description, the direction of the rotational axis of the motor 1 may be simply referred to as the "axial direction."

[0010] FIG. 1 is a perspective view showing an example of a motor in the first embodiment. FIG. 2 is a cross-sectional view showing an example of a motor in the first embodiment. FIG. 3 is a perspective view of the motor in the first embodiment with a housing removed. FIG. 2 shows a cross-section taken along line AA in FIG. 1. As shown in FIGS. 1 to 3, a motor 1 in this embodiment includes a stator 2, a rotor 40, a first substrate 50, a second substrate 60, a housing 70, a shaft 80, and a bearing housing 90. The stator 2 includes an insulator 10, a stator core 20, and a coil 30.

[0011] In this embodiment, the insulator 10 is made of an insulating material such as resin. The stator core 20 is formed by stacking a predetermined number of steel plates made of a magnetic material such as silicon steel plates in the axial direction. The stator core 20 includes teeth 21 protruding in the radial direction and a core back 22 extending in the circumferential direction. The coil 30 is wound around the stator core 20 with the insulator 10 interposed therebetween.

[0012] The coil 30 is formed by winding, for example, a copper wire, etc. The rotor 40 is formed by a magnet 41, for example, a neodymium magnet, etc., and a yoke 42 as a magnetic body.

[0013] In this embodiment, the first board 50 is, for example, a driver circuit that controls the operation of the motor 1. The second board 60 receives, for example, an alternating current (AC) power supply from an external source and supplies a direct current (DC) power supply to the motor 1.

[0014] The housing 70 is made of a metal such as steel, and houses the stator 2. The shaft 80 has an end 81 on the upper side in the drawing that faces the first substrate 50 in the axial direction, and an output side end 82 on the lower side in the drawing. The shaft 80 is inserted into a bearing housing 90.

[0015] Fig. 4 is a perspective view showing an example of an insulator in the first embodiment. As shown in Fig. 4, the insulator 10 includes an outer circumferential portion 11, a connection portion 12, an inner circumferential portion 13, and a coupling portion 14. As shown in Fig. 4, the insulator 10 further includes a fixing portion 15, a first conductive member 16, and a second conductive member 17 on the axial upper side.

[0016] The insulator 10 is attached to the stator core 20 from above in the axial direction, as shown in Fig. 2. Note that the insulator 10 may be configured in combination with a lower insulator 18 that is attached to the stator core 20 from below in the axial direction, as shown in Fig. 2.

[0017] 2 to 4, the outer circumferential portion 11 of the insulator 10 faces the core back 22 of the stator core 20 in the axial direction. The connection portion 12 of the insulator 10 faces the teeth portion 21 of the stator core 20 in the axial direction. The coil 30 is wound around the teeth portion 21 via the connection portion 12.

[0018] The inner circumferential portion 13 of the insulator 10 has an outer surface in the radial direction opposed to the coil 30. The inner surface in the radial direction of the inner circumferential portion 13 opposes the bearing housing 90.

[0019] The connecting portion 14 of the insulator 10 extends radially outward from the outer circumferential portion 11 of the insulator 10. The connecting portion 14 is connected to a housing 3 in which the motor 1 is mounted, which is not shown in Figures 1 to 4. The housing 3 is an example of an external device.

[0020] 1, the insulator 10 has two connecting portions 14 that face each other in the radial direction. In the present embodiment, a configuration in which the insulator 10 has two connecting portions 14 will be described, but the number of connecting portions 14 is not limited thereto. For example, the insulator 10 may have only one connecting portion 14, or may have three or more connecting portions 14.

[0021] In this embodiment, as shown in FIG. 1, the motor 1 and the housing 3 are connected by a connecting portion 14 provided on the insulator 10, which is a resin member, instead of a mounting portion formed on the housing 70. FIG. 5 is a bottom view showing an example of the motor in the first embodiment. As shown in FIG. 5, a gap G0 is formed between the cylindrical portion 79 of the housing 70 and the connecting portion 14 of the insulator 10. This allows the metal housing 70 to be made smaller, thereby realizing a reduction in the weight of the motor 1. In addition, since the connecting portion 14 is formed on the insulator 10, which is made of a resin having a higher elasticity than metal, the vibration generated from the motor 1 is reduced when it is propagated to the housing 3 due to the internal loss of the resin member. In addition, the amplitude of the vibration generated from the motor 1 is reduced due to the internal loss of the resin member, and the vibration is attenuated in a shorter time. Furthermore, the insulator 10 makes it difficult for noise generated from the motor 1 to be transmitted, so that the motor 1 can be made quieter.

[0022] 1 and 4 is, for example, a protruding portion made of resin. A first substrate 50 is fixed to the fixing portion 15 in the axial direction.

[0023] 1 and 4 are terminal pins that process windings that form the coil 30. In this embodiment, the motor 1 includes, for example, three first conductive members 16 and one second conductive member 17.

[0024] For example, the winding starts of the COM, U-phase, V-phase, and W-phase windings are wound around the first conductive member 16, and fixed to the first board 50 by soldering. This electrically connects the coil 30 and the first board 50.

[0025] The second conductive member 17 has the end of the winding of the COM wound around it and is covered with a resin. The second conductive member 17 is fixed to the first board 50 by soldering. The first board 50 and the second board 60 are electrically connected by pins (conductive members) 51a of the connecting member 51. The pins 51a of the multiple connecting members 51 are electrically connected to GND, Vdc, Vcc, etc., and signals are transmitted from an external device. This electrically connects the coil 30, the first board 50, and the second board 60.

[0026] In this embodiment, the first substrate 50 and the second substrate 60 are disposed to face each other with a gap G1 therebetween in the axial direction, as shown in Figures 1 and 2. That is, the first substrate 50 and the second substrate 60 are spaced apart in the axial direction.

[0027] As shown in FIG. 1 and FIG. 2, the first board 50 includes a connecting member 51 and a first conductive wire 52. The connecting member 51 is, for example, a pin 51a (conductive member) that electrically connects the first board 50 and the second board 60, which is coated with resin. In this embodiment, the first board 50 includes five connecting members 51. The first conductive wire 52 is connected to a Hall sensor (not shown) provided on the rotor 40 side of the first board 50. In this manner, by using the connecting member 51 having the first conductive member 16, the second conductive member 17, and the pin 51a to fix the first board 50 and the second board 60, and to fix the first board 50 and the second board 60 to the insulator 10, the structural members of the motor 1 can be reduced.

[0028] A plurality of electronic components 61 are mounted on the second substrate 60. The electronic components 61 are, for example, but not limited to, a capacitor and an AC-DC converter. In addition, a second conductor 62 that supplies power is connected to the second substrate 60.

[0029] 1, the electronic component 61 has a relatively large size compared to the dimensions of the motor 1. In this embodiment, the electronic component 61 is disposed on the upper surface of the second substrate 60 in the axial direction, i.e., on the surface opposite the surface facing the first substrate 50 and the insulator 10. In other words, the electronic component 61 is disposed on the surface opposite the output end 82 of the shaft 80 in the axial direction. This allows the motor 1 to be made smaller in size or diameter.

[0030] Further, the radial size of the first substrate 50 and the second substrate 60 is formed to be smaller than the radial size of the outer circumferential portion 11 of the insulator 10. FIG. 6 is an enlarged cross-sectional view showing an example of a motor in the first embodiment. FIG. 6 is an enlarged view of a portion indicated by region F in FIG. 2. As shown in FIG. 6, a gap G2 is formed between the outer circumferential portion 11 of the insulator 10 and the outer circumferential portion 59 of the first substrate 50 and the outer circumferential portion 69 of the second substrate 60. The gap G2 forms an annular space C1 surrounding the outer circumferential portion 59 of the first substrate 50 and the outer circumferential portion 69 of the second substrate 60. This prevents the housing 3 from contacting the first substrate 50 or the second substrate 60, thereby suppressing the propagation of vibration to the housing 3. In FIG. 6, an example in which the size of the first substrate 50 in the radial direction and the size of the second substrate 60 in the radial direction are substantially the same have been described, but this is not limiting, and it is sufficient that the outer peripheral portion 59 of the first substrate 50 and the outer peripheral portion 69 of the second substrate 60 are located inside the outer peripheral portion 11 of the insulator 10 in the radial direction. Also, the gap G4 between the inner surface of the housing 3 and the outer peripheral portion 59 of the first substrate 50 and the outer peripheral portion 69 of the second substrate 60 may be enlarged to enlarge the annular space C1. Also, the gap G5 may be provided between the inner surface of the housing 3 and the outer peripheral portion 11 of the insulator 10, and the space C2 having the gap G5 may be provided to surround the outer peripheral portion 11 of the insulator 10, thereby forming the space C2 larger. By providing these spaces, it becomes easier for wind to pass through the inside of the motor 1 including the coil 30, and the temperature rise of the motor 1 can be suppressed.

[0031] 6, a gap G3 is formed between the first substrate 50 and other components of the motor 1. For example, the outer circumferential portion 59 of the first substrate 50 and the cylindrical portion 79 of the metal housing 70 are separated by a gap G6. This makes it possible to suppress the vibration of the motor 1 from propagating to the first substrate 50 or the second substrate 60.

[0032] The bearing housing 90 includes a pair of bearings 91 and 92. Each of the bearings 91 and 92 faces the shaft 80 in the radial direction. In this embodiment, an end 93 of the bearing housing 90 on the first substrate 50 side in the axial direction faces the yoke 42 of the rotor 40 in the axial direction. The bearing housing 90 also integrally holds the lower bearing 91 in the axial direction and the upper bearing 92 in the axial direction. This improves the coaxial accuracy of the lower bearing 91 and the upper bearing 92, thereby realizing a longer life for the motor 1.

[0033] FIG. 7 is a perspective view showing an example of a housing in the first embodiment. As shown in FIG. 5 and FIG. 7, the housing 70 includes a tubular portion 79 and a bottom surface 71. The bottom surface 71 constitutes a lower end surface of the housing 70 in the axial direction. The bottom surface 71 is formed with an insertion hole 74 for inserting the shaft 80. The bottom surface 71 is also formed with a plurality of holes 72 and a plurality of holes 73. In this embodiment, the diameter of the hole 72 is formed to be larger than the diameter of the hole 73. The insertion hole 74 is an example of a first hole. The hole 72 is an example of a second hole, and the hole 73 is an example of a third hole.

[0034] 5, the hole 72 is formed, for example, at a position facing the coil 30 in the axial direction. That is, the hole 72 is formed so that air can pass through the inside of the motor 1 including the coil 30. By forming the hole 72 in the bottom surface 71 of the housing 70, the weight of the housing 70 can be reduced and a temperature rise in the motor 1 due to self-heating of the coil 30 and heat transmission from the coil 30 to the stator core 20 and the rotor 40 can be suppressed. That is, the hole 72 suppresses high-temperature demagnetization of the motor 1 and deterioration of the resin material of the insulator 10 due to heat generation, and the like, and achieves a reduction in weight and a longer life.

[0035] 7 may be used as, for example, positioning holes or screw holes for attaching the housing 70 to the insulator 10 or the first board 50. In this case, the hole 73 may be formed, for example, at a position facing the first board 50 in the axial direction. This can improve the assembly accuracy of the motor 1 and reduce the assembly cost of the motor 1. Note that, although the housing 70 shown in FIG. 7 has seven holes 72 and five holes 73, the number of holes provided in the housing 70 is not limited thereto.

[0036] As described above, the motor 1 in this embodiment includes the rotor 40, the stator 2, the first substrate 50, and the second substrate 60 on which the electronic components 61 are provided. The stator 2 includes the stator core 20, the insulator 10, and the coil 30 wound around the stator core via the insulator. The insulator 10 includes a connecting portion 14 for connecting to an external device. The first substrate 50 is fixed to the insulator 10. The second substrate 60 is fixed to the first substrate 50, and the first substrate 50 and the second substrate 60 are spaced apart in the direction of the rotation axis of the rotor 40. This configuration can achieve weight reduction and noise reduction.

[0037] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above embodiment, and various modifications are possible. [Explanation of symbols]

[0038] 1 motor, 2 stator, 3 housing, 10 insulator, 11 outer periphery, 12 connection portion, 13 inner periphery, 14 connection portion, 15 fixing portion, 16 first conductive member, 17 second conductive member, 18 lower insulator, 20 stator core, 21 teeth portion, 22 core back, 30 coil, 40 rotor, 41 magnet, 42 yoke, 50 first board, 51 connection member, 52 first conducting wire, 59 outer periphery, 60 second board, 61 electronic component, 62 second conducting wire, 69 outer periphery, 70 housing, 71 bottom surface, 72, 73 hole portion, 74 insertion hole, 79 cylindrical portion, 80 shaft, 90 bearing housing, 91, 92 Bearings

Claims

1. A rotor; a stator including a stator core, an insulator, and a coil wound around the stator core via the insulator; A first substrate; a second substrate on which electronic components are provided; A housing and Equipped with The insulator includes a connecting portion for connecting to an external device, the first substrate is fixed to the insulator; the second substrate is fixed to the first substrate, The first substrate and the second substrate are spaced apart from each other in a rotation axis direction of the rotor, a wind passes through an annular first space formed by an outer periphery of the first substrate, an outer periphery of the second substrate, and an inner surface of the housing, and a second space formed by a component having the stator and the rotor, and the inner surface of the housing; Motor.

2. A rotor, a stator including a stator core, an insulator, and a coil wound around the stator core via the insulator; A first substrate; a second substrate on which electronic components are provided; A housing and Equipped with the first substrate is fixed to the stator; the second substrate is fixed to the first substrate, The first substrate and the second substrate are spaced apart from each other in a rotation axis direction of the rotor, a wind passes through an annular first space formed by an outer periphery of the first substrate, an outer periphery of the second substrate, and an inner surface of the housing, and a second space formed by a component having the stator and the rotor, and the inner surface of the housing; Motor.

3. the second substrate is fixed to the first substrate via a connecting member, The motor according to claim 1 , wherein the first board and the second board are fixed to the insulator.

4. The insulator includes an inner periphery and an outer periphery having a connecting portion, The motor according to claim 1 , wherein the insulator is provided at an outer periphery thereof with a fixing portion for fixing the first substrate.

5. the insulator is provided with a first conductive member that electrically connects the coil and the first substrate, The motor according to claim 1 , wherein the first substrate is fixed to the insulator via the first conductive member.

6. The motor according to claim 1 , wherein a connecting member includes a conductive member that electrically connects the coil, the first board, and the second board.

7. The motor according to claim 1 , wherein an outer periphery of the first substrate and an outer periphery of the second substrate are located radially inward of an outer periphery of the insulator.

8. a housing that accommodates a portion of the stator; The motor according to claim 1 , wherein an entire outer periphery of the first board and an entire outer periphery of the second board are spaced apart from the housing in the axial direction.

9. The motor according to claim 8 , wherein an outer periphery of the housing is located inside an outer periphery of the insulator.

10. 10. The motor according to claim 8, wherein a first hole for inserting a shaft therethrough and a plurality of second holes having a size different from that of the first hole are formed in a bottom surface of the housing.

11. The motor of claim 10 , further comprising a third hole smaller than the second hole formed in a bottom surface of the housing.

Images