Motor

Abstract

A motor includes a housing in which a housing chamber for housing a stator is formed, the housing having a partition wall that partitions the housing chamber from the outside, a terminal portion is electrically connected to the stator, at least a portion of the terminal portion is exposed in a hole portion provided in the partition wall, and at least a portion of the terminal portion is exposed in the hole portion. The housing chamber is closed by a sealing cover of an insulator, and the terminal portion is configured to be connected to a power line that supplies power to the stator from the outside.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on Japanese Patent Application No. 2024-064970 filed with the Japan Patent Office on April 12, 2024, and Japanese Patent Application No. 2024-166052 filed with the Japan Patent Office on September 25, 2024, the entire contents of which are hereby incorporated by reference. Technical Field

[0002] The present disclosure relates to motors. Background Art

[0003] Japanese Patent Application Laid-Open No. 8-727 discloses a motor with liquid-proofing measures, wherein the motor has an oil seal to improve liquid tightness. Summary of the Invention

[0004] The motor of this embodiment includes a shell forming a storage chamber for storing a stator, the shell includes a partition wall separating the storage chamber from the outside, a terminal portion is electrically connected to the stator, at least a portion of the terminal portion is exposed in a hole portion provided in the partition wall, a sealing cover of an insulator closes the storage chamber in the hole portion, and the terminal portion is configured to be connected to a power line on the outside that supplies power to the stator. In conventional motor structures, the power line is drawn from the motor through a hole in the motor housing. This hole is then sealed with a sealing cap. However, the sealing cap is prone to falling out of the hole, leaving room for improvement in operability.

[0005] An object of the present disclosure is to provide a motor capable of improving assembly workability.

[0006] A motor according to one embodiment of the present invention includes a housing having a storage chamber for accommodating a stator, the housing including a partition wall separating the storage chamber from the outside, a terminal portion being electrically connected to the stator, at least a portion of the terminal portion being exposed in a hole provided in the partition wall, a sealing cover of an insulator closing the storage chamber in the hole, and the terminal portion being configured to be connected to a power line on the outside for supplying power to the stator.

[0007] According to the above configuration, a motor capable of improving assembly workability can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view showing an example of a motor according to this embodiment. Figure 2 The motor of this embodiment is Figure 1 The view taken along the II-II line is shown. Figure 3It is a diagram showing a seal cover used in the motor according to this embodiment. Figure 4 It is along Figure 1 The IV-IV line section view. Figure 5 This is another example of the motor of this embodiment. Figure 2 Partial cross-sectional view viewed from the same direction. Figure 6 It is a perspective view showing another example of the motor according to the present embodiment. DETAILED DESCRIPTION In the following detailed description, for purposes of illustration, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown for simplicity of drawing.

[0009] The following describes a specific example of the motor of this embodiment with reference to the accompanying drawings. Note that this embodiment is not limited to these examples. All modifications within the scope of the claims and equivalents to the claims are included within the scope of this embodiment.

[0010] Figure 1 : is a perspective view showing an example of the motor 1 of this embodiment. Figure 2 Therefore Figure 1 The cross-sectional view of the motor 1 of this embodiment is shown as a cross-sectional view taken along the line II-II. In this embodiment, an inner rotor type brushless motor is described as the motor 1. Figure 1 and Figure 2 As shown, the motor 1 includes a rotor 10 , a stator 20 , a frame 2 , a bracket 3 , a cover 4 , an encoder 40 , a terminal portion 50 , and a sealing cover 100 .

[0011] The frame 2 and the bracket 3 are components that constitute the outer periphery of the main body of the motor 1. The frame 2 is composed of a flange portion 2a and a square tube portion 2b mounted on the flange portion 2a. The inner space of the square tube portion 2b is Figure 2 The lower part of the paper is closed by the flange 2a. Figure 2 The bracket 3 is provided to close the opening of the frame 2. The frame 2 and the bracket 3 form a motor housing 5. The motor housing 5 has a storage chamber R1 inside. The storage chamber R1 can accommodate the rotor 10 and the stator 20 described later. The bracket 3 functions as a partition wall that separates the storage chamber R1 from the outside. Figure 2In the example shown, the frame 2 is composed of two components, the flange portion 2a and the square tube portion 2b. However, the frame 2 may be composed of more components. Alternatively, the frame 2 may be composed of a single component including the flange portion 2a and the square tube portion 2b.

[0012] The rotor 10 is supported by the frame 2 via bearings 11 so as to be rotatable about the rotation axis. The rotor 10 includes a shaft 30, a rotor magnet 12b, and a yoke 12a. The shaft 30 is an axial member extending along the rotation axis. The rotor magnet 12b and the yoke 12a are provided on the outer periphery of the shaft 30.

[0013] The stator 20 has a plurality of iron cores 21. The iron cores 21 are formed by stacking a plurality of electromagnetic steel plates. Coils (not shown) are wound around the iron cores 21. The ends 23 of the coils wound around the iron cores 21 are exposed to the outside at the axial ends of the stator 20. In this state, the iron cores 21 are sealed by a sealant. Hereinafter, the portion covered by the sealant is referred to as a molded portion 22. In this embodiment, as a sealant, the molded portion 22 uses, for example, an insulating thermosetting resin. The molded portion 22 is roughly cylindrical and extends along the axis of rotation.

[0014] The encoder 40 is capable of detecting the relative rotation angle of the rotor 10 with respect to the stator 20. The encoder 40 has an encoder code disc 41, a hub 42, and a sensor unit 43. The hub 42 is fixed to the shaft 30. The encoder code disc 41 is fixed to the hub 42 and rotates integrally with the shaft 30. An optical pattern such as a slit is provided on the encoder code disc 41. The sensor unit 43 reads, for example, the transmitted light or reflected light of the light irradiating the optical pattern. In this way, the relative rotation angle of the rotor 10 with respect to the stator 20 is detected. The encoder 40 is not only an optical encoder but also a magnetic encoder. The encoder 40 is arranged outside the storage chamber R1 divided by the frame 2 and the bracket 3. In addition, the encoder 40 is protected by a cover 4 mounted on the bracket 3. In this embodiment, the encoder 40 is arranged in the encoder chamber R2 formed by the cover 4 and the bracket 3.

[0015] The terminal portion 50 is electrically connected to the end portion 23 of the coil at the axial end portion of the stator 20. A power line 51 for supplying power is connected to the terminal portion 50. In this embodiment, the terminal portion 50 and the power line 51 are connected by a crimping terminal 52 (see Figure 4 ) electrical connection.

[0016] like Figure 2 As shown, the housing chamber R1 in which the bearing 11 is installed and the encoder chamber R2 in which the encoder 40 is installed are separated by the bracket 3. In order to maintain the rolling characteristics of the rolling element well, the bearing 11 is provided with lubricating oil. When the lubricating oil adheres to the encoder 40 which is a precision device, the performance of the encoder 40 may be degraded. Figure 2In the example of FIG, in order to suppress the performance degradation of the encoder 40, the bracket 3 partitions the storage chamber R1 and the encoder chamber R2.

[0017] However, the power line 51 in the encoder chamber R2 needs to supply power to the stator 20 in the storage chamber R1. Therefore, in the motor 1 of this embodiment, the bracket 3 is provided with a hole 3a that exposes the terminal 50 electrically connected to the stator 20. Furthermore, an insulating seal cap 100 is fitted into the hole 3a. The seal cap prevents lubricating oil from entering the encoder chamber R2 through the hole 3a.

[0018] In a plan view, the hole portion 3a is a curved, oval through hole extending in the circumferential direction. Figure 1 As shown, the sealing cover 100 has a shape corresponding to the hole portion 3 a so as to be fit into the hole portion 3 a. Figure 3 1 is a perspective view of the sealing cover 100. Figure 3 As shown, the sealing cap 100 is configured to have a substantially bathtub shape with a depression U at the center. The sealing cap 100 includes a bottom 101 forming the bottom surface of the depression U, an opening 102 provided on the bottom 101, an edge 103, and a protrusion 104. The edge 103 extends from the bottom 101 and forms the outer circumference of the depression U. The protrusion 104 extends from at least a portion of the bottom 101 toward the side opposite to the edge 103. The opening 102 includes a first opening 102a and a second opening 102b. The second opening 102b extends from the first opening 102a along the longitudinal direction of the sealing cap 100. The first opening 102a only needs to be of a size and shape that is at least large enough to allow the terminal 50 to pass through.

[0019] Figure 4 yes Figure 1 Section view along line IV-IV. Figure 4 1 is a diagram showing a state in which the sealing cap 100 used in this embodiment is fitted into the hole portion 3a. Figure 4 As shown, the sealing cover 100 is configured to fit seamlessly into the hole 3a provided in the bracket 3. The first opening 102a is positioned directly above the end 23 when the sealing cover 100 is fitted into the hole 3a. At this point, the bottom 101 of the sealing cover 100 abuts the molded portion 22. The edge 103 abuts the inner circumferential surface of the hole 3a. Furthermore, the frame portion of the first opening 102a provided in the bottom 101 abuts the molded portion 22 seamlessly.

[0020] In addition, a protrusion 104 is provided on the bottom surface of the sealing cover 100. The protrusion 104 protrudes from the bottom surface of the sealing cover 100 along the inner circumferential surface 22a of the molded portion 22 toward the storage chamber R1. In this way, the protrusion 104 abuts the inner circumferential surface 22a of the molded portion 22 without a gap. In the example shown in the figure, the distance from the radially inner portion of the terminal portion 50 to the radially inner portion of the molded portion 22 is short. Therefore, lubricating oil adhering to the inner circumferential surface of the molded portion 22 may seep into the encoder chamber R2 side along the gap between the terminal portion 50 and the molded portion 22. Therefore, the sealing cover 100 is provided with a protrusion 104 extending along the inner circumferential surface 22a of the molded portion 22. This ensures that the contact area between the sealing cover 100 and the molded portion 22 is maintained. In addition, the intrusion of lubricating oil can be suppressed.

[0021] In the example shown in the figure, the terminal portion 50 is a threaded member. The terminal portion 50 is screwed into the threaded hole of the end portion 23. Thus, the terminal portion 50 is fixed to the end portion 23. Furthermore, the crimping terminal 52 is clamped by the head portion of the terminal portion 50 and the end portion 23. Thus, the crimping terminal 52 is fixed to the terminal portion 50. Thus, the power line 51 is connected to the stator 20. The second opening portion 102b of the sealing cover 100 has a size that can accommodate the shaft portion of the crimping terminal 52. The shaft portion of the crimping terminal 52 is located within the second opening portion 102b. Thus, the movement of the crimping terminal 52 can be suppressed.

[0022] After the terminal portion 50 is connected to the power line 51, for example, molten resin flows into the recess U of the sealing cap 100. This seals the connection between the terminal portion 50 and the power line 51. This protects the connection state of the terminal portion 50.

[0023] In a commonly known motor structure, a power line is led out from a storage chamber that houses a rotor and a stator. For this purpose, a hole is provided in a portion of the storage chamber. In this structure, the hole is configured to be closed by a sealing cover after the power line is led out. This prevents the lubricating oil used in the bearing that flows out to the outside through the hole from adhering to precision components such as the encoder disc. However, in this structure, when the power line connected to the terminal moves, the sealing cover may fall off. Therefore, the motor assembler needs to assemble the motor carefully to prevent the sealing cover from falling off. Therefore, the assembly workability is low.

[0024] In the motor 1 of this embodiment, at least a portion of the terminal portion 50 is exposed from the sealing cover 100. Furthermore, a power line 51 for supplying power to the stator 20 is connected to the terminal portion 50 outside the sealing cover 100. According to this configuration, the terminal portion 50 exposed from the sealing cover 100 is connected to the power line 51 outside the sealing cover 100. Therefore, even if the power line 51 moves, the sealing cover 100 does not move. Consequently, the sealing cover 100 is less likely to fall off than in a typical configuration. Therefore, a motor with high assembly workability can be provided.

[0025] Furthermore, according to the motor 1 of this embodiment, the sealing cover can also be held between the power line and the partition wall (bracket 3). With this structure, the sealing cover is more difficult to fall off.

[0026] Furthermore, according to the motor 1 of this embodiment, the sealing cover 100 has a recess U. In the structure of the motor 1, the connection portion between the terminal portion 50 and the power line 51 in the recess U can also be sealed with resin. According to the above structure, the connection portion is protected by the resin. Furthermore, the terminal portion 50 and the power line 51 are difficult to move relative to the sealing cover 100. As a result, the sealing cover is difficult to fall off. Therefore, a motor with high assembly workability can be provided.

[0027] Furthermore, according to the motor 1 of this embodiment, the recess U may extend in the extending direction of the power line 51. This can suppress interference between the power line 51 and the seal cover 100.

[0028] In addition, according to the motor 1 of this embodiment, the power line 51 can also be connected through the crimping terminal 52 ( Figure 4 ) is connected to the terminal portion 50. In this case, the recess U extends in the extension direction of the crimping terminal 52. Thus, interference between the crimping terminal 52 and the sealing cover 100 can be suppressed.

[0029] Furthermore, according to the motor 1 of this embodiment, the partition wall (bracket 3 ) may be configured to separate the housing chamber R1 from the encoder chamber R2 housing the encoder 40 . This can prevent oil leaking from the bearing from adhering to the encoder 40 .

[0030] The present embodiment has been described above. The structure of the motor of the present embodiment is not limited to the above structure. Figure 5 A motor according to another embodiment of the present disclosure will be described. Figure 5 A motor 500 according to another embodiment of the present disclosure is shown. Figure 5 It is from Figure 2 A partial cross-sectional view of the motor 500 viewed from the same direction. Figures 1 to 4 The same components in the illustrated embodiments are denoted by the same reference numerals, and their descriptions are omitted.

[0031] exist Figure 5 In the embodiment shown, Figure 2 The motor housing 5 is the same as the embodiment shown, and the frame 2 and the partition wall (bracket 3) constitute the motor housing 5. In addition, the molded portion 22 of the stator 20 is housed in the cylindrical space (storage chamber R1) inside the motor housing 5. The terminal portion 50 is provided in the molded portion 22. An opening is provided that opens toward the top of the motor housing 5. The annular bracket 3 is embedded in the opening. The bracket 3 is provided with a hole portion 3a. Figure 5In the illustrated embodiment, the hole 3 a provided in the bracket 3 is sealed by a sealing cover 300 .

[0032] The sealing cap 300 includes a plate-shaped portion 301, an opening 302 provided in the plate-shaped portion 301, an outer edge 303, and an inner edge 304. The outer edge 303 is located radially outward of the plate-shaped portion 301. The inner edge 304 is located radially inward of the plate-shaped portion 301. The sealing cap 300 is configured such that the opening 302 is located directly above the terminal portion 50.

[0033] like Figure 5 As shown, a sealing cover 300 according to another embodiment of the present disclosure is positioned so as to be sandwiched between the molded portion 22 and the bracket 3. More specifically, the sealing cover 300 is positioned so as to be sandwiched between the molded portion 22 and the bracket 3 in the axial direction of the motor 500. The outer edge 303 of the sealing cover 300 is positioned so as to abut against the bottom surface of the bracket 3. Furthermore, the lower surface 305 of the sealing cover 300 is positioned so as to abut against the upper surface 22b of the molded portion 22.

[0034] The seal cover 300 is sandwiched between the bracket 3 and the molded portion 22. Therefore, compressive forces act on the seal cover 300 from both the bracket 3 and the molded portion 22. This ensures that the seal cover 300 is in close contact with the bracket 3 and the molded portion 22. This prevents oil from leaking from the storage chamber R1.

[0035] It is preferable that the lower surface 305 of the sealing cover 300 is provided over the inner peripheral surface 22a and the upper surface 22b of the molded portion 22. Figure 5 In the illustrated example, the upper surface 22b of the molded portion 22 is divided into an inner peripheral portion 223, where the terminal portion 50 is provided, and an outer peripheral portion 224, where the terminal portion 50 is not provided. The sealing cap 300 is preferably provided so as to abut against the molded portion 22 over the entire inner peripheral surface 22a and outer peripheral portion 224 of the molded portion 22. This configuration increases the contact area between the sealing cap 300 and the molded portion 22, thereby improving the close contact between the sealing cap 300 and the molded portion 22.

[0036] In addition, the lower surface 305 of the sealing cover 300 is in contact with the upper surface 22b of the molded portion 22. It is preferable that the lower surface 305 has a shape corresponding to the concave and convex shape of the upper surface 22b of the molded portion 22. For example, Figure 5 In the upper surface 22b of the molded portion 22 shown in FIG. 2 , the inner peripheral portion 223 has a shape that is axially raised compared to the outer peripheral portion 224. That is, an inclined surface 226 that is raised toward the inner diameter side is formed between the inner peripheral portion 223 and the outer peripheral portion 224. Figure 5As shown, the lower surface 305 of the seal cover 300 conforms to the shape of the upper surface 22b of the molded portion 22, and includes a portion abutting the inner peripheral portion 223, a portion abutting the inclined surface 226, and a portion abutting the outer peripheral portion 224. This structure facilitates radial alignment of the seal cover and facilitates securing the seal cover to the upper surface of the molded portion. This provides a motor with highly efficient assembly.

[0037] Furthermore, in the illustrated example, the outer edge portion 303 is thicker than the plate-shaped portion 301. The outer peripheral portion 224 of the upper surface 22b of the molded portion 22 is lower than the inner peripheral portion 223. Consequently, a large gap exists between the bracket 3 and the outer peripheral portion 224. The outer edge portion 303 fills this large gap. This effectively prevents oil from leaking from the storage chamber R1.

[0038] In the illustrated example, the inner edge portion 304 is thicker than the plate-shaped portion 301. The outer peripheral surface 304a of the inner edge portion 304 abuts the inner peripheral surface 22a of the molded portion 22. The seal cap 300 includes the inner edge portion 304 and a portion abutting the inclined surface 226. This facilitates close contact with the molded portion 22.

[0039] use Figure 6 A sealing cap 300 according to another embodiment of the present disclosure will be described in detail. Figure 6 It is a perspective view showing a motor 500 according to another embodiment of the present disclosure. Figure 6 The motor 500 is shown in the process of being assembled. The seal cap 300 is shown placed on the terminal portion 50 provided on the mold portion 22. During the process of placing the seal cap 300 on the upper surface 22b of the mold portion 22, the opening 302 of the seal cap 300 must be positioned directly above the terminal portion 50 provided on the upper surface of the mold portion 22. Therefore, the seal cap 300 must be aligned in the circumferential direction of the motor 500.

[0040] like Figure 6 As shown, the sealing cover 300 may also be configured to have a positioning protrusion 306 that is embedded in the opening 225. The opening 225 is formed on the upper surface 22b of the molded portion 22 during the molding process. Figure 6 The illustrated seal cover 300 is configured such that, when the positioning protrusion 306 is inserted into the opening 225, the opening 302 is positioned above the terminal portion 50 of the molded portion 22. This configuration allows the seal cover 300 to be positioned circumferentially simply by inserting the positioning protrusion 306 into the opening 225. This simplifies the positioning of the seal cover 300 circumferentially relative to the motor 500.

[0041] The above describes this embodiment. However, the structure of this embodiment is not limited to the above-described example. For example, the structure of this embodiment can also be applied to any machine having a rotating mechanism including a rotor supported by bearings using lubricating oil.

[0042] The above describes the present embodiment. However, the technical scope of the present embodiment should not be interpreted restrictively based on the description of the present embodiment. The described embodiment is merely an example. Those skilled in the art will understand that the described embodiment can be modified in various ways within the scope of the claims. The technical scope of the present embodiment should be determined based on the scope of the claims and their equivalents. The detailed description has been presented for purposes of illustration and description. Numerous variations and modifications are possible in light of the above teachings. The detailed description is not intended to be exhaustive or to limit the subject matter described herein. Although the subject matter has been described in words using specific structural features and / or methodological procedures, it should be understood that the subject matter defined in the claims is not necessarily limited to the specific features or procedures described. Rather, the specific features and procedures described are described as examples of implementing the claims.

Claims

1. A motor, wherein: The motor includes a housing having a housing for housing a stator. The housing includes a partition wall separating the storage chamber from the outside. The stator is electrically connected to a terminal portion. At least a portion of the terminal portion is exposed in the hole portion provided in the partition wall. In the hole, a sealing cover of an insulator closes the storage chamber. The terminal portion is configured to be connected to a power line that supplies power to the stator at the outside.

2. The motor according to claim 1, wherein The sealing cover is configured to be sandwiched between the power line and the partition wall.

3. The motor according to claim 1 or 2, wherein: The sealing cover is configured to have a recess in which a connection portion between the terminal portion and the power line is sealed with resin.

4. The motor according to claim 3, wherein The recess extends toward an extending direction of the power line.

5. The motor according to claim 1 or 2, wherein: The partition wall separates the storage chamber from an encoder chamber in which an encoder is stored.

6. The motor according to claim 1, wherein The sealing cover is fitted into the hole.

7. The motor according to claim 1, wherein The seal cover is sandwiched between a resin mold portion that seals the stator and the partition wall.

8. The motor according to claim 7, wherein The sealing cover is located between the molded portion and the partition wall in the axial direction of the motor.

9. The motor according to claim 7, wherein The terminal portion is provided on the inner peripheral portion of the upper surface of the mold portion. The sealing cover contacts the molded portion from an inner peripheral surface of the molded portion to an outer peripheral portion of the upper surface of the molded portion.

10. The motor according to claim 7, wherein In a cross section of the motor having surfaces expanding in the axial and radial directions, a lower surface of the seal cover has a shape corresponding to a concavo-convex shape of the upper surface of the molded portion.

11. The motor according to claim 10, wherein The sealing cover includes a positioning protrusion, The positioning protrusion is inserted into an opening provided on the upper surface of the molding portion.

12. The motor according to claim 11, wherein The openings are traces of pressing pins that extend from the outside of the mold to hold down the substrate when insert molding the stator.

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