Rotating device

Abstract

To provide a rotating device with a well-balanced rotating body.SOLUTION: A motor 1 includes an impeller 30, a shaft 2 having an upper end 2b on the impeller 30 side and a lower end 2c, a first bearing 8 on the upper end 2B side of the shaft 2, a second bearing 9 on the lower end 2c side of the shaft 2, and a balance adjustment member 50 fixed to the shaft 2, and in a longitudinal direction of the shaft 2, the balance adjustment member 50 is located on the lower end 2c side of the shaft 2 with respect to the second bearing 9.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotating device, and more particularly to a rotating device having an impeller. [Background technology]

[0002] Rotating machines having impellers are known to have various structures.

[0003] The following Patent Document 1 discloses the structure of an electric blower in which the circumferential surface of the motor rotor is flattened with a flat member made of insulating molding material, and a rotational balance adjustment member integrally molded with the rotor using insulating molding material is provided near the end face of the armature. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 06-233510 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a rotating device having a well-balanced rotor. [Means for solving the problem]

[0006] In order to achieve the above object, according to one aspect of the present invention, a rotating device includes a housing having a suction port, a rotor, a stator radially opposed to the rotor, an impeller, a shaft having one end on the impeller side and another end, a first bearing on the one end side of the shaft, a second bearing on the other end side of the shaft, a member fixed to a portion of the shaft on the other end side of the shaft relative to the second bearing, a first frame holding the first bearing, and a second frame holding the second bearing, The housing surrounds the impeller, the first frame, the second frame, and the stator, and an air passage is formed between the housing and the stator, and air is discharged through the air passage. The member has a cylindrical portion having one end on the impeller side and a flange having the other end, and in the longitudinal direction of the shaft, the second frame has an opening on the other end side of the shaft relative to the second bearing, the cylindrical portion is arranged inside the opening, and the flange faces the opening.

[0007] Preferably, the flange is located on the other end side of the shaft relative to the opening in the longitudinal direction of the shaft.

[0008] Preferably, a substrate is provided facing the member.

[0009] Preferably, electronic components are disposed on the substrate.

[0010] Preferably, the member is disposed radially inward relative to the electronic component.

[0011] Preferably, the electronic component is a sensor or a connector.

[0012] Preferably, the substrate is provided with a driving circuit.

[0013] Preferably, the substrate is fixed to the housing.

[0014] According to these inventions, it is possible to provide a rotating device in which the rotor is well balanced. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side cross-sectional view showing a motor according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional perspective view of a balance adjustment member. [Figure 3] FIG. 4 is a perspective view showing an example of a hole provided in a flange. [Figure 4] FIG. 10 is a perspective view showing an example of a recess provided in a flange. [Figure 5] FIG. 10 is a side cross-sectional view showing a motor according to a modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] A motor according to an embodiment of the present invention will now be described.

[0017] In the following description, the direction parallel to the rotational axis of the motor will be referred to as the rotational axis direction. The direction perpendicular to the rotational axis will be referred to as the radial direction. The direction of rotation around the rotational axis will be referred to as the circumferential direction. The rotational axis direction will be referred to as the up-down direction (the direction in which the rotational axis protrudes from the motor housing is the up direction). The plane perpendicular to the rotational axis will be referred to as the horizontal plane. The terms "up-down," "up," "down," "horizontal," etc. used here are used for convenience when focusing only on the motor, and do not limit the direction in the device in which the motor is installed or the attitude in which the motor is used.

[0018] FIG. 1 is a side cross-sectional view showing a motor 1 according to an embodiment of the present invention.

[0019] In the following figures, arrow D indicates the direction of the rotation axis (the longitudinal direction of the shaft 2).

[0020] The motor (an example of a rotating device) 1 is a brushless motor. The motor 1 has an air blowing function and can rotate an impeller 30 to blow air from above to below.

[0021] As shown in FIG. 1, the motor 1 has frames 10 and 11, a shaft 2, a housing 12, and a base plate 40. The upper frame 10 holds a first bearing 8. The lower frame 11 holds a second bearing 9. The motor 1 has a stator 20 and a rotor 5 inside the stator. The stator 20 is located between the upper frame 10 and the lower frame 11 and is fixed to the frames 10 and 11. The rotor 5 is attached to the shaft 2.

[0022] The shaft 2 serves as the rotating shaft of the motor 1. The shaft 2 is supported by a first bearing 8 and a second bearing 9. The shaft 2 is rotatable relative to the frames 10 and 11. That is, the first bearing 8 is located on the upper end portion (an example of one end portion) 2b side of the shaft 2, and the upper end portion 2b of the shaft 2 is located above the first bearing 8. The second bearing 9 is located on the lower end portion (an example of the other end portion) 2c side of the shaft 2, and the lower end portion 2c of the shaft 2 is located below the second bearing 9.

[0023] In this embodiment, the lower frame 11 has an opening 11b. In the longitudinal direction of the shaft 2, the opening 11b is located on the lower end 2c side of the shaft 2 relative to the second bearing 9. The shaft 2 extends downward through the opening 11b.

[0024] The stator 20 has a stator yoke 23 and coils 25. A plurality of combinations of the salient poles of the stator yoke 23 and the coils 25 wound around them are arranged in the circumferential direction so as to surround the rotor 5, and the outer periphery of the rotor 5 faces each salient pole of the stator yoke 23. In other words, the outer periphery of the rotor 5 is surrounded by a plurality of combinations of the salient poles of the stator yoke 23 and the coils 25.

[0025] The rotor 5 is located inside the stator 20. The rotor 5 has a magnet 3. When a current flows sequentially through the multiple coils 25 of the stator 20 in a predetermined manner, the rotor 5 rotates together with the shaft 2 relative to the frames 10 and 11.

[0026] The impeller 30 is attached between the upper end 2b of the shaft 2 and the first bearing 8, and rotates together with the shaft 2. In this embodiment, the impeller 30 is a mixed flow impeller, but is not limited to this.

[0027] The housing 12 is disposed so as to surround the stator 20 and the frames 10 and 11. The housing 12 and the frames 10 and 11 are partially joined together. The housing 12 is formed so as to surround the impeller 30 except for the central portion of the impeller 30. The top of the housing 12 is open, and this opening serves as an air suction port.

[0028] An air passage 13 that allows air to pass vertically is formed between the housing 12 and the stator 20. As the impeller 30 rotates, air is drawn into the housing 12 from an opening at the top of the housing 12. The drawn air is guided downward through the air passage 13 and discharged from the bottom of the housing 12 to the outside.

[0029] A substrate 40 is disposed below the stator 20 and the lower frame 11. The substrate 40 is, for example, a printed wiring board. The substrate 40 is fixed to the lower end of the housing 12 in a position substantially perpendicular to the shaft 2 (in a position substantially parallel to the horizontal plane).

[0030] The substrate 40 is provided with a control circuit for driving the motor 1. The substrate 40 supplies a driving current to each coil 25 of the motor 1 at a timing according to the rotation of the rotor 5, thereby driving the motor 1.

[0031] A plurality of electronic components 41 and 43 are arranged on the lower surface of substrate 40, i.e., the surface opposite to the surface on which stator 20 is provided. In this embodiment, electronic component 41 has a first volume, and electronic component 43 has a second volume larger than the first volume.

[0032] The electronic components 41 and 43 may be, for example, sensors that detect magnetic fields such as Hall elements, or connectors that connect power lines and signal lines from external devices to the control circuit on the substrate 40, but are not limited to these.

[0033] In this embodiment, only one balance adjustment member 50 is fixed to the shaft 2. The balance adjustment member 50 is a member that is eccentric with respect to the shaft 2. The balance adjustment member 50 is a balancer that eliminates imbalance (disproportion) among the impeller 30, the shaft 2, and the rotor 5.

[0034] As shown in FIG. 1, in the longitudinal direction of the shaft 2, the balance adjustment member 50 is located on the side of the lower end portion 2c of the shaft 2 relative to the second bearing 9.

[0035] FIG. 2 is a cross-sectional perspective view of the balance adjustment member 50. As shown in FIG.

[0036] As shown in FIG. 2, the balance adjustment member 50 has an overall cylindrical shape with a flange. The balance adjustment member 50 has a cylindrical portion 51 whose longitudinal direction is the up-down direction, and a flange 56 provided on an outer peripheral surface 52 of the cylindrical portion 51. The flange 56 has a larger diameter than the cylindrical portion 51, and an outer peripheral surface 57 of the flange 56 is located outside the outer peripheral surface 52 of the cylindrical portion 51. The flange 56 is formed on the lower end 55 side of the balance adjustment member 50. The balance adjustment member 50 has a hole 53 penetrating in the longitudinal direction. The hole 53 is formed from an upper end 54 of the balance adjustment member 50 (the upper end of the cylindrical portion 51) to a lower end 55 of the balance adjustment member 50 (the lower surface of the flange 56).

[0037] The balance adjustment member 50 is press-fitted onto the shaft 2 so that the shaft 2 passes through the hole 53 .

[0038] 1, in this embodiment, a cylindrical portion 51 is disposed inside the opening 11b, thereby reducing the vertical dimension of the motor 1.

[0039] In this embodiment, the outer peripheral surface 57 of the flange 56 is located radially inward of the outer peripheral portion of the second bearing 9. In other words, the diameter of the outer peripheral surface 57 of the flange 56 is smaller than the diameter of the outer peripheral portion of the second bearing 9, which is indicated by the dashed dimension line in FIG. 1. Because the diameter of the outer peripheral surface 57 of the flange 56 is relatively small, the area extending radially from the outer peripheral surface 57 of the flange 56 is wide, making it possible to arrange components in this area. This allows the motor 1 to be made smaller.

[0040] In this embodiment, the outer periphery of balance adjustment member 50, i.e., outer periphery surface 57 of flange 56, is located radially inward relative to the position of electronic component 43 having a relatively large second volume. Electronic component 41 having a relatively small first volume is located radially inward of outer periphery surface 57 on substrate 40.

[0041] The balance adjustment member 50 has at least one of a hole 58 and a recess 59 formed in a part of the flange 56 .

[0042] Fig. 3 is a perspective view showing an example of a hole 58 provided in the flange 56. Fig. 4 is a perspective view showing an example of a recess 59 provided in the flange 56.

[0043] In this way, by providing at least one of the hole 58 and the recess 59 in a part of the flange 56, the balance adjustment member 50 can be said to be a member that is eccentric with respect to the rotation axis of the motor 1 (shaft 2).

[0044] Hole 58 may be formed such that the depth direction is the radial direction from outer peripheral surface 57 of flange 56. Hole 58 may be a bottomed hole formed from only the upper surface or only the lower surface of flange 56. Recess 59 may be a portion formed by missing a part of outer peripheral surface 57, or may be a portion formed by missing a part of the upper surface or the lower surface of flange 56. Recess 59 may be a portion where the thickness of flange 56 is thinner in the rotational axis direction.

[0045] Furthermore, the balance adjustment member 50 is not limited to one having holes 58 or recesses 59 formed in the flange 56. For example, the center of the flange 56 may be eccentric by being radially shifted from the center of the cylindrical portion 51. Furthermore, the flange 56 may be eccentric by having a thickness in the rotational axis direction that varies in the circumferential direction, for example.

[0046] The degree of eccentricity of the balance adjustment member 50 relative to the rotational axis of the motor 1 is set in each motor 1 to correspond to the degree of eccentricity of the combination of the impeller 30, shaft 2, and rotor 5. In other words, the amount of eccentricity of the balance adjustment member 50 is set so that the rotor formed by the combination of the impeller 30, shaft 2, rotor 5, and balance adjustment member 50 is balanced when rotated about the rotational axis. The balance adjustment member 50 functions as a balancer in the motor 1 to correct imbalance of the rotor. Note that, although balance here refers to static balance, it is not limited to this and may also refer to dynamic balance.

[0047] In this embodiment, after the impeller 30, shaft 2, rotor 5, and balance adjustment member 50 without holes 58 or the like are assembled to the motor 1, additional processing can be performed on the balance adjustment member 50 while measuring the balance of the rotating body, thereby providing holes 58 or recesses 59 in the flange 56. In other words, after the rotating body is assembled to the motor 1, the holes 58 or recesses 59 can be formed in the flange 56 to prevent eccentricity of the rotating body. By locating the balance adjustment member 50 on the outer side of the pair of bearings 8, 9 and on the lower end 2c side opposite the impeller 30 side, balance correction including the impeller 30 can be performed before the board 40 is attached (in the state of the motor 1 subassembly (intermediate assembly)). This allows the balancing process to be completed in a single step during the assembly of the motor 1. This allows the balance of the rotating body to be easily improved, and the motor 1 can be manufactured easily and at low cost.

[0048] Because the balance adjustment member 50 is formed with a flange 56 that protrudes in the radial direction, the balance of the rotating body can be achieved with a relatively small amount of machining. That is, as can be understood from the centrifugal force formula (F=mrω^2 (the number to the right of "^" indicates an exponent)), by drilling a hole or performing cutting at a position away from the shaft 2 (a position where "r" is large in the above formula), a relatively small amount of machining can have a large effect on the balance. Therefore, the balance of the rotating body can be improved more easily.

[0049] A modified example of this embodiment will be described below. In the following description, the same components as those in this embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

[0050] [Description of Modifications]

[0051] A balance adjustment member may be further disposed on the impeller. Also, a centrifugal impeller may be used as the impeller.

[0052] FIG. 5 is a side cross-sectional view showing a motor 101 according to a modified example of the present embodiment.

[0053] 5, motor 101 has impeller 130, which is a centrifugal impeller. In addition to balance adjustment member 50 provided on the lower end 2c side of shaft 2, a second balance adjustment member 150 is also provided above impeller 130, i.e., on the upper end 2b side of shaft 2.

[0054] Unlike the balance adjustment member 50, the second balance adjustment member 150 has a flat disk shape. The second balance adjustment member 150 is fixed to the shaft 2 using, for example, screws or the like, but is not limited to this. The second balance adjustment member 150 may also have a shape having a cylindrical portion and a flange, similar to the balance adjustment member 50, and may be press-fitted onto the shaft 2 to be fixed.

[0055] In this modification, by using the balance adjustment member 50, it is possible to easily improve the balance of the rotor formed by the combination of the impeller 130, the shaft 2, the rotor 5, and the balance adjustment members 50 and 150, as in the above-described embodiment. Furthermore, the second balance adjustment member 150 can also be used as a machining allowance when performing balancing, thereby improving the degree of freedom when performing balancing. Furthermore, by machining both balance adjustment members 50 and 150, it is possible to effectively improve dynamic imbalance.

[0056] [others]

[0057] The motor may be configured by partially combining the features of the above-described embodiments and modifications. In the above-described embodiments and modifications, some components may be omitted, or some components may be configured in a different manner.

[0058] The type of motor is not limited, and may be, for example, a brushless motor or other motors.

[0059] The above-described embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0060] 1,101 Motor (an example of a rotating device) 2 shafts 2b Upper end (an example of one end) 2c Lower end (an example of the other end) 5 rotors 8 No. 1 bearing 9 Second bearing 10,11 frames 11b opening 12 Housing 20 Stator 23 stator core 25 coils 30,130 impeller 40 boards 41,43 Electronic Components 50 Balance adjustment member 51 Cylinder part 56 Flange 58 Hole 59 Recess

Claims

1. a housing having a suction port; A rotor, a stator facing the rotor in a radial direction; The impeller and a shaft having one end on the impeller side and the other end; a first bearing located on the one end side of the shaft; a second bearing located on the other end of the shaft; a member fixed to a portion of the shaft that is located on the other end side of the shaft relative to the second bearing; and a first frame that holds the first bearing; a second frame that holds the second bearing, the housing surrounds the impeller, the first frame, the second frame, and the stator; An air passage is formed between the housing and the stator, Air is discharged through the ventilation passage, The member includes a cylindrical portion having one end on the impeller side and a flange having the other end, In the longitudinal direction of the shaft, the second frame has an opening on the other end side of the shaft relative to the second bearing, The cylindrical portion is disposed inside the opening, The flange faces the opening.

2. The rotating device according to claim 1 , wherein the flange is located on the other end side of the shaft relative to the opening in the longitudinal direction of the shaft.

3. The rotating device according to claim 1 , further comprising a substrate facing the member.

4. The rotating device according to claim 3 , wherein electronic components are disposed on the substrate.

5. The rotating device according to claim 4 , wherein the member is disposed radially inward relative to the electronic component.

6. The rotating device according to claim 4 or 5, wherein the electronic component is a sensor or a connector.

7. The rotating device according to claim 3 , wherein a drive circuit is provided on the substrate.

8. The rotating device according to claim 3 , wherein the substrate is fixed to the housing.

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