Motors and Drives

Abstract

To provide a motor capable of reducing an axial size.SOLUTION: This motor comprises: a rotor 10 having a shaft 11 disposed so as to be rotatable about a center axis and a bearing 12 which rotatably supports the shaft; a stator disposed so as to face the rotor in a radial direction; a coil wound on the stator; a bearing holder 40 that holds the bearing; a busbar holder 50 positioned on one or the other side of the bearing holder in the axial direction; and a cylindrical housing 60 that has an opening on one side in the axial direction. The rotor, the stator, the bearing holder, and the busbar holder are stored in the housing, and the busbar holder is fixed to the bearing holder to abut in the axial direction. A power supply busbar and a signal busbar are formed integrally with the busbar holder. A circuit board 70 and a sensor 80 are stored between the busbar holder and the bearing holder.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Conventionally, a brushless motor has been known in which a bearing holder is located in an opening of the motor housing and also serves as a cover for the motor (Patent Document 1). The cover covers the opening of the housing, thereby enclosing the motor body including the busbar assembly within the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2020-511920 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a structure using a conventional bearing holder, the bus bar assembly is located inside the motor housing, and there is a fixed axial distance between the bearing holder as a cover and the bus bar holder, which is disadvantageous in reducing the axial dimension of the motor.

[0005] It should be noted that the above description of the technical background is only provided to clearly and completely explain the technical solutions of the present invention and to facilitate the understanding of those skilled in the art, and the above technical solutions should not be deemed to be known to those skilled in the art simply because they are described in the background section of the present invention. [Means for solving the problem]

[0006] One embodiment of the motor of the present invention includes a rotor having a shaft rotatably arranged around a central axis and bearings rotatably supporting the shaft, a stator arranged radially opposite the rotor, a coil wound around the stator, a bearing holder that holds the bearing, a bus bar holder located on one axial side or the other axial side of the bearing holder, and a cylindrical housing having an opening on one axial side, and the rotor, stator, bearing holder, and bus bar holder are accommodated in the housing, the bus bar holder is fixed to the bearing holder so as to abut in the axial direction, a power bus bar and a signal bus bar are formed integrally with the bus bar holder, and a circuit board and a sensor are accommodated between the bus bar holder and the bearing holder. [Effects of the Invention]

[0007] In one embodiment of the present application, the busbar assembly is disposed on the outside of the cover portion of the motor, and the two are fixed together so that they abut in the axial direction, and the sensor and circuit board are housed between them, thereby reducing the axial dimension of the motor and making it possible to miniaturize the motor.

[0008] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, and the forms in which the features of the present invention may be employed are clearly shown. The embodiments of the present invention are not limited to the embodiments disclosed in the following description and drawings. The embodiments of the present invention include all variations, modifications, and equivalents within the scope of the claims. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of an example of a motor according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic view of the motor shown in FIG. 1 from another angle. [Figure 3] FIG. 3 is a plan view of the motor shown in FIG. [Figure 4] FIG. 4 is a schematic diagram of one axial cross section of the motor viewed along the direction AA shown in FIG. [Figure 5]Fig. 5 is a schematic diagram of an example of a bus bar holder of the motor shown in Fig. 1. According to the method for manufacturing magnetic poles of one aspect of the present invention, it is possible to provide a rotor with a stable outer diameter. DETAILED DESCRIPTION OF THE INVENTION

[0010] The foregoing and other features of the present invention will become apparent from the following specification, which refers to the drawings. Particular embodiments of the present invention are specifically disclosed in the specification and drawings, which are illustrative of some of the embodiments in which the present invention may be employed. It is to be understood that the present invention is not limited to the described embodiments, but on the contrary, the present invention includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0011] In the following examples, the term "and / or" includes any and all combinations of one or more of the associated listed terms. Terms such as "comprising," "comprising," "having," etc. refer to the presence of stated features, elements, parts, or assemblies but do not exclude the presence or addition of one or more other features, elements, parts, or assemblies.

[0012] In the embodiments of the present invention, the singular forms "a," "the," etc. may include the plural and should be understood broadly to mean "one of," or "a type of," and not limited to "one." Furthermore, the term "said" should be understood to include both the singular and the plural, unless the context clearly indicates otherwise. Furthermore, the term "according to" should be understood to mean "at least in part according to," and the term "based on" should be understood to mean "at least in part based on."

[0013] In the following description of the present invention, for convenience of explanation, the direction extending along or parallel to the central axis O of the motor will be referred to as the "axial direction." The direction pointing from the bottom of the motor housing toward the bus bar holder will be referred to as the "upper axial side" or "one axial side." The direction pointing from the bus bar holder toward the bottom of the motor housing will be referred to as the "lower axial side" or "other axial side." The radial direction centered on the central axis O will be referred to as the "radial direction." The direction approaching the central axis O will be referred to as the "radially inner side," and the direction away from the central axis O will be referred to as the "radially outer side." The direction surrounding the central axis O will be referred to as the "circumferential direction." However, these terms are used merely for convenience of explanation and do not limit the orientation of the motor during use or manufacture.

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0015] First Example

[0016] A first embodiment of the present invention provides a motor.

[0017] Fig. 1 is a schematic diagram of an example of a motor according to an embodiment of the present invention, showing the motor as viewed from one axial side. Fig. 2 is a schematic diagram of the motor shown in Fig. 1 from another angle, showing the motor as viewed from the other axial side. Fig. 3 is a plan view of the motor shown in Fig. 1. Fig. 4 is a schematic diagram of one axial cross section of the motor as viewed from the AA direction in Fig. 3, showing the structure of a portion of the motor.

[0018] As shown in Figures 1 to 4, a motor according to an embodiment of the present invention comprises a rotor 10 having a shaft 11 rotatably arranged around a central axis O and a bearing 12 rotatably supporting the shaft 11, a stator (not shown) arranged radially opposite the rotor 10, a coil (not shown) wound around the stator, a bearing holder 40 that holds the bearing 12, a busbar holder 50 located on one axial side or the other axial side of the bearing holder 40, and a cylindrical housing 60 having an opening on one axial side, and the rotor 10, stator, bearing holder 40 and busbar holder 50 are accommodated within the housing 60.

[0019] In an embodiment of the present invention, the bus bar holder 50 is fixed to the bearing holder 40 so as to abut in the axial direction, the power bus bar PS and the signal bus bar S are integrally formed with the bus bar holder 50, and the circuit board 70 and the sensor 80 are housed between the bus bar holder 50 and the bearing holder 40.

[0020] According to the structure of the bus bar holder 50 of the embodiment of the present invention, the axial dimension of the motor can be reduced, which is advantageous for making the motor smaller.

[0021] In some embodiments, as shown in Figure 4, the bearing holder 40 serves as a cover for the motor. In other words, the bearing holder 40 covers the motor. The bus bar holder 50 is located on one axial side of the bearing holder 40. This makes it easier to form a connector by placing the bus bar holder 50 outside the motor, increasing design freedom.

[0022] FIG. 5 is a schematic diagram of an example of a bus bar holder 50 of the motor shown in FIG.

[0023] 1 to 5, the bus bar holder 50 has a main body portion 51 and a connector portion 52 extending in the axial direction from a radially outer edge portion of the main body portion 51. As shown in FIGS. 1 and 3, the connector portion 52 at least partially overlaps with the edge portion of the housing 60 in the axial direction.

[0024] 1, the connector portion 52 of the bus bar holder 50 and the edge of the housing 60 abut against each other in the axial direction. This allows the connector portion of the bus bar holder 50 to be supported via the edge of the housing 60.

[0025] 1, in some embodiments, the fixed portion F of the bus bar holder 50 and the bearing holder 40 is located on the other axial side of one axial edge of the housing 60. In other words, the fixed portion F is located at the same position as the opening of the housing 60 or on the other axial side of the opening of the housing 60. This allows the axial dimension of the motor to be further reduced.

[0026] In the above embodiment, the method of fixing the bus bar holder 50 and the bearing holder 40 is not particularly limited, and they may be fixed by methods such as interference fitting or caulking.

[0027] 4, at least a portion of the bearing holder 40 is recessed toward the other axial side (the lower side shown in FIG. 4) to form a recess 41 (the portion of the bearing holder 40 enclosed in a dashed line frame). The sensor 80 is housed in the recess 41, and one axial side of the recess 41 (the upper side shown in FIG. 4) is covered by the bus bar holder 50.

[0028] In the above embodiment, the bus bar holder 50 forms a sealed structure for the recess 41. This prevents external dust from entering the inside of the recess 41, thereby extending the service life of the motor.

[0029] In some embodiments, as shown in Fig. 4, the bus bar holder 50 has a protruding edge 54 that protrudes toward the other axial side (the downward side as shown in Fig. 4). The outer peripheral surface of the protruding edge 54 is fixed by an interference fit to the inner peripheral surface of the recess 41 of the bearing holder 40. However, the present invention is not limited to this, and the fit between the outer peripheral surface of the protruding edge 54 and the inner peripheral surface of the bearing holder 40 may be a clearance fit.

[0030] In the above embodiment, the structure of the flange 54 allows the busbar holder 50 to form a seal with the recess 41 in which the sensor 80 is housed, thereby preventing external debris from entering and interfering with the sensing effect of the sensor 80, thereby extending the service life of the motor.

[0031] In the above embodiment, the interference fit or clearance fit structure further improves the concentricity between the bus bar holder 50 and the bearing holder 40 and enables the bus bar holder 50 and the bearing holder 40 to be fixed together. The interference fit or clearance fit is located at a fixing portion F that is located axially below (i.e., on the other axial side of) the opening of the housing 60. This allows the axial dimension of the motor to be reduced, which is advantageous for making the motor more compact.

[0032] In some embodiments, as shown in FIG. 4, the circuit board 70 is fixed to the surface of the other axial side (the lower side shown in FIG. 4) of the bus bar holder 50 so as to abut in the axial direction, or the circuit board 70 is fixed to the surface of one side (the upper side shown in FIG. 4) of the bus bar holder 50 facing the bearing holder 40 so as to abut in the axial direction, and the circuit board 70 is located radially inward of the protruding edge 54.

[0033] In the above embodiment, the circuit board 70 is fixed to the surface on the axial lower side (i.e., the other axial side) of the bus bar holder 50, or to the surface on the axial upper side (i.e., one axial side) of the bearing holder 40. This makes it possible to seal the circuit board 70, further reducing the axial dimension of the motor, which is advantageous for miniaturizing the motor.

[0034] In the above embodiment, when the circuit board 70 is disposed on the surface of the axially lower side (i.e., the other axial side) of the bus bar holder 50, the circuit board 70 can be disposed at a position radially inward of the protruding edge 54. This saves space in the axial direction of the motor.

[0035] In some embodiments, as shown in Fig. 4, the radially outer peripheral surface of the bearing holder 40 has an outer peripheral edge 42 that is interference-fitted into the housing 60. As shown in Figs. 1 and 3, the bearing holder 40 is formed with a crimping portion 43 that extends along the radial direction. The bus bar holder 50 is formed with a crimped portion 53 that extends along the radial direction. The crimping portion 43 and the crimped portion 53 are located radially outside the recess 41, and the crimping portion 43 and the crimped portion 53 are fixed by crimping in the axial direction.

[0036] In the above embodiment, "fixed by crimping in the axial direction" means that the direction of the force applied when crimping is the axial direction.

[0037] 4, the outer peripheral edge 42 is bent axially downward (i.e., toward the other axial side) from the radially outer edge of the bearing holder 40 to form a fold, thereby increasing the fixing strength between the bearing holder 40 and the housing 60.

[0038] In the above embodiment, when the crimping portion 43 and the crimped portion 53 extending radially are used to crimp and fix the bearing holder 40 and the bus bar holder 50, the design of the outer peripheral edge 42 makes it possible to prevent deformation of the bearing holder 40.

[0039] In the above embodiment, the position where the crimping portion 43 and the crimped portion 53 are crimped and fixed is the aforementioned fixing portion F. The fixing portion F is located axially below (i.e., on the other axial side of) the opening of the housing 60. This allows the axial dimension of the motor to be reduced, which is advantageous for miniaturizing the motor.

[0040] 4 , one end of the signal bus bar S is exposed from the side of the bus bar holder 50 facing the bearing holder 40. The circuit board 70 is disposed on the side of the bus bar holder 50 facing the bearing holder 40. That is, the circuit board 70 is disposed on the side of the bus bar holder 50 facing the bearing holder 40. One end of the signal bus bar S is inserted into an electrical connection hole of the circuit board 70. One end of the signal bus bar S is electrically connected to the circuit board 70.

[0041] In the above embodiment, the above structure makes it easy to form the power terminals and the signal terminals integrally.

[0042] The above provides an illustrative description of the structure of a motor related to the present invention, but the present invention is not limited thereto, and appropriate modifications may be made based on the above embodiments. Furthermore, while the above description merely provides an illustrative description of each component, the present invention is not limited thereto, and reference may be made to related art for specific details of each component. Furthermore, components not shown in FIGS. 1 to 5 may be added, or one or more components shown in FIGS. 1 to 5 may be removed. Reference may be made to related art for other configurations and structures of the motor, and a description thereof will be omitted here.

[0043] According to an embodiment of the present invention, the busbar assembly is disposed on the outside of the motor cover, and the two are fixed together so as to abut in the axial direction, and the sensor and circuit board are housed between them, thereby reducing the axial dimension of the motor and contributing to the miniaturization of the motor.

[0044] Second Example

[0045] A second embodiment of the present invention provides a drive device including the motor described in the first embodiment. The structure of the motor is explained in detail in the first embodiment, and the details thereof are incorporated herein, so further explanation will be omitted here.

[0046] In the second embodiment of the present invention, the driving device may be a driving device for any electrical product, and other configurations of the driving device can be referred to in the related art, and the description thereof will be omitted here.

[0047] Third Example

[0048] A third embodiment of the present invention provides an electrical appliance having the drive device described in the second embodiment, which has the motor described in the first embodiment. The structure of the motor is described in detail in the first embodiment, and the content thereof is incorporated herein, so further description will be omitted here.

[0049] In the third embodiment of the present invention, the electrical appliance may be any electrical equipment equipped with a motor, for example, a household appliance such as an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a water dispenser, a washing machine, a vacuum cleaner, a compressor, a blower, a mixer, etc., or an industrial appliance or various information processing equipment such as a pump, a conveyor, an elevator, a standard industrial general-purpose mounter, a wind power generator, a grinder, a traction motor, etc., or various automotive components such as an automotive electric power steering system, an automotive sunroof adjustment component, a seat adjustment component, a transmission, a brake system, etc.

[0050] Although the present invention has been described above in connection with specific embodiments, these descriptions are merely illustrative and do not limit the scope of the claims of the present invention. Those skilled in the art can make various modifications and alterations to the present invention based on the spirit and principles of the present invention, and these modifications and alterations also fall within the scope of the claims of the present invention.

Claims

1. a rotor having a shaft rotatably arranged around a central axis and a bearing rotatably supporting the shaft; a stator disposed radially opposite the rotor; a coil wound around the stator; a bearing holder for holding the bearing; a bus bar holder located on one axial side or the other axial side of the bearing holder; a cylindrical housing having an opening on one axial side; and the rotor, the stator, the bearing holder, and the bus bar holder are accommodated in the housing, the bus bar holder is fixed to the bearing holder so as to abut against the bus bar holder in the axial direction; a power bus bar and a signal bus bar are integrally formed with the bus bar holder; A motor, wherein a circuit board and a sensor are housed between the bus bar holder and the bearing holder.

2. the bearing holder serves as a cover that covers the opening of the motor, The motor according to claim 1 , wherein the bus bar holder is located on one axial side of the bearing holder.

3. The motor according to claim 1 , wherein a fixed portion between the bus bar holder and the bearing holder is located on the other axial side of an edge portion on one axial side of the housing.

4. a recessed portion recessed toward the other axial side is formed in at least a portion of the bearing holder; The sensor is housed in the recess, The motor according to claim 2 , wherein one axial side of the recess is covered by the bus bar holder.

5. the bus bar holder has a protruding edge protruding toward the other axial side, The motor according to claim 4 , wherein an outer peripheral surface of the protruding edge is fixed to an inner peripheral surface of the recess of the bearing holder by interference fit.

6. the circuit board is fixed to a surface on the other axial side of the bus bar holder so as to abut against the bus bar holder in the axial direction, or the circuit board is fixed to a surface on one axial side of the bearing holder so as to abut against the bus bar holder in the axial direction, The motor according to claim 5 , wherein the circuit board is located radially inward of the protruding edge.

7. a radially outer peripheral surface of the bearing holder having an outer peripheral edge that is fixed to the housing by an interference fit; The bearing holder is formed with a crimped portion extending along a radial direction, a caulking portion extending along a radial direction is formed on the bus bar holder, The motor according to claim 4 , wherein the crimping portion and the crimped portion are located radially outward of the recess, and the crimping portion and the crimped portion are fixed by crimping in the axial direction.

8. one end of the signal bus bar is exposed from a side of the bus bar holder facing the bearing holder, the circuit board is disposed on a side of the bus bar holder facing the bearing holder, The motor according to claim 2 , wherein one end of the signal bus bar is inserted into an electrical connection hole of the circuit board.

9. A drive device comprising the motor according to any one of claims 1 to 8.

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