Motor

Abstract

To provide a motor capable of improving assembly workability.SOLUTION: A motor 1 includes a housing 5 forming a housing chamber R1 accommodating a rotor 10 and a stator 20. The housing 5 has a partition wall 3 separating the housing chamber R1 from its exterior. The partition wall 3 is provided with an aperture 3a exposing a terminal portion 50 electrically connected to the stator 20. The aperture 3a is sealed off from the housing chamber R1 and the exterior by an insulating sealing cap 100. At least a portion of the terminal section 50 is exposed from the sealing cap 100, and a power line 51 supplying power to the stator 20 is connected externally to the sealing cap 100.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a liquid-proof motor in which the liquid-tightness is improved by an oil seal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 8-727 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional motor, power lines are drawn from inside the motor through a hole in the motor housing, and then the hole is sealed with a sealing cap. However, the sealing cap is prone to falling off the hole, leaving room for improvement in workability.

[0005] According to the present disclosure, an object is to provide a motor that can improve assembly workability. [Means for solving the problem]

[0006] A motor according to one aspect of the present disclosure includes: A motor having a housing that forms an accommodation chamber that accommodates a rotor and a stator, the housing has a partition wall separating the storage chamber from the outside, the partition wall is provided with a hole through which a terminal portion electrically connected to the stator is exposed, the hole is closed off between the accommodation chamber and the outside by an insulating sealing cap, At least a portion of the terminal portion is exposed from the sealing cap, and a power line that supplies power to the stator is connected to the terminal portion outside the sealing cap. [Effects of the Invention]

[0007] According to the above configuration, it is possible to provide a motor that can improve assembly workability. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating an example of a motor according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of the motor according to this embodiment taken along line II-II in FIG. [Figure 3] FIG. 3 shows a sealing cap used in the motor according to this embodiment. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a partial cross-sectional view showing an example of a motor according to another embodiment of the present disclosure, viewed from the same direction as FIG. 2. [Figure 6] FIG. 6 is a perspective view showing an example of a motor according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Details of the embodiments of the present disclosure] Specific examples of motors according to embodiments of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0010] Fig. 1 is a perspective view showing an example of a motor 1 according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the motor 1 according to this embodiment taken along line II-II shown in Fig. 1. In this embodiment, an inner rotor type brushless motor will be described as the motor 1. As shown in Figs. 1 and 2, the motor 1 has 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 cap 100.

[0011] The frame 2 and bracket 3 are components that form the outer periphery of the motor 1. The frame 2 is composed of a flange 2a and a rectangular tube 2b attached to the flange 2a. The interior space of the rectangular tube 2b is closed by the flange 2a at the bottom of the page in FIG. 2 and opens at the top of the page in FIG. 2. The bracket 3 is provided to close the opening of the frame 2. The frame 2 and bracket 3 form a motor housing 5. The motor housing 5 has an internal storage chamber R1. The storage chamber R1 can accommodate a rotor 10 and a stator 20, which will be described later. The bracket 3 functions as a partition wall that separates the storage chamber R1 from the outside. Note that FIG. 2 shows an example in which the frame 2 is composed of two parts, the flange 2a and the rectangular tube 2b, but it may be composed of more parts, or it may be composed of a single part in which the flange 2a and the rectangular tube 2b are integrated.

[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 in the direction of 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 an iron core 21 formed by laminating a plurality of electromagnetic steel plates. A coil (not shown) is wound around the iron core 21. The coil wound around the iron core 21 is sealed with a sealing material, with end portions 23 exposed at the axial end of the stator 20. Hereinafter, the portion covered with the sealing material will be referred to as a molded portion 22. In this embodiment, an insulating thermosetting resin or the like is used as the sealing material for the molded portion 22. The molded portion 22 has a substantially cylindrical shape extending along the rotation axis.

[0014] The encoder 40 can detect the relative rotation angle of the rotor 10 with respect to the stator 20. The encoder 40 has an encoder disk 41, a hub 42, and a sensor unit 43. The hub 42 is fixed to the shaft 30. The encoder disk 41 is fixed to the hub 42 and rotates integrally with the shaft 30. The sensor unit 43, for example, irradiates an optical pattern such as a slit on the encoder disk 41 with light, reads the transmitted light and reflected light, and detects the relative rotation angle of the rotor 10 with respect to the stator 20. The encoder 40 need not be an optical encoder, but may be a magnetic encoder. The encoder 40 is provided outside an accommodation chamber R1 separated by the frame 2 and the bracket 3. The encoder 40 is protected by a cover 4 attached to the bracket 3. In this embodiment, the encoder 40 is provided inside an encoder chamber R2 defined 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 of the stator 20. A power line 51 for supplying electric power is connected to the terminal portion 50. In this embodiment, the terminal portion 50 and the power line 51 are electrically connected by a crimp terminal 52 (see FIG. 4).

[0016] As shown in FIG. 2, the accommodation chamber R1 in which the bearing 11 is provided is separated from the encoder chamber R2 in which the encoder 40 is provided by a bracket 3. The bearing 11 contains lubricant to maintain good rolling characteristics of the rolling elements. If this lubricant gets on the encoder 40, which is a precision instrument, there is a risk that the performance of the encoder 40 will deteriorate. In the example shown in FIG. 2, the accommodation chamber R1 and the encoder chamber R2 are separated by the bracket 3 to prevent deterioration of the performance of the encoder 40.

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

[0018] In top view, the hole 3a is a curved, oval-shaped through-hole extending in the circumferential direction. As shown in FIG. 1, the sealing cap 100 has a shape corresponding to the hole 3a so that it can fit into the hole 3a. FIG. 3 is a perspective view of the sealing cap 100. As shown in FIG. 3, the sealing cap 100 is configured in a roughly bathtub shape with a depression U in its center. The sealing cap 100 has a bottom 101 that forms the bottom surface of the depression U, an opening 102 provided in the bottom 101, an edge 103 extending from the bottom 101 and forming the outer circumferential surface of the depression U, and a protrusion 104 extending from at least a portion of the bottom 101 to the side opposite the edge 103. The opening 102 has a first opening 102a and a second opening 102b extending from the first opening 102a along the longitudinal direction of the sealing cap 100. The first opening 102a may have any size and shape that allows at least the terminal portion 50 to be inserted therethrough.

[0019] 4 is a cross-sectional view taken along line IV-IV in FIG. 1, showing the state in which the sealing cap 100 according to this embodiment is fitted into the hole 3a. As shown in FIG. 4, the sealing cap 100 is configured to fit snugly into the hole 3a formed in the bracket 3. When the sealing cap 100 is fitted into the hole 3a, the first opening 102a is positioned directly above the end portion 23. At this time, the bottom 101 of the sealing cap 100 abuts against the molded portion 22, and the edge 103 abuts against the inner circumferential surface of the hole 3a. In addition, the frame portion of the first opening 102a formed in the bottom 101 abuts against the molded portion 22 without any gaps.

[0020] In addition, a protrusion 104 is provided on the bottom surface of the sealing cap 100. The protrusion 104 protrudes from the bottom surface of the sealing cap 100 along the inner circumferential surface 22a of the molded portion 22 toward the accommodation chamber R1 so as to abut against the inner circumferential surface 22a of the molded portion 22 without any gap. In the illustrated example, 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 easily seeps into the encoder chamber R2 through the gap between the terminal portion 50 and the molded portion 22. Therefore, the sealing cap 100 is provided with the protrusion 104 extending along the inner circumferential surface 22a of the molded portion 22 to ensure a contact area between the sealing cap 100 and the molded portion 22 and prevent the intrusion of lubricating oil.

[0021] In the illustrated example, the terminal portion 50 is a screw fastener. The terminal portion 50 is fixed to the end portion 23 by screwing the terminal portion 50 into a screw hole in the end portion 23. The crimp terminal 52 is fixed to the terminal portion 50 by being sandwiched between the head of the terminal portion 50 and the end portion 23. This allows the power line 51 to be electrically connected to the stator 20. The second opening 102b of the sealing cap 100 is large enough to accommodate the shaft portion of the crimp terminal 52. The shaft portion of the crimp terminal 52 is positioned within the second opening 102b, thereby preventing the crimp terminal 52 from moving.

[0022] After connecting the power line 51 to the terminal portion 50, molten resin or the like is poured into the recess U of the sealing cap 100. This seals the connection between the terminal portion 50 and the power line 51, protecting the connection state of the terminal portion 50.

[0023] Conventionally, motors have been known to have a structure in which a hole is provided in a portion of a housing chamber that houses a rotor and a stator to allow power lines to exit the housing. In this structure, a known configuration is to cover the hole with a sealing cap after the power lines are extracted to prevent lubricating oil used in the bearings from leaking out through the hole and adhering to precision components such as an encoder disk. However, in this configuration, there is a risk that the sealing cap will fall off if the power lines connected to the terminals are moved. Therefore, motor assemblers must assemble the motor carefully to prevent the sealing cap from falling off, which reduces assembly workability.

[0024] In the motor 1 according to the present disclosure, at least a portion of the terminal portion 50 is exposed from the sealing cap 100, and a power line 51 that supplies power to the stator 20 is connected outside the sealing cap 100. According to this configuration, the terminal portion 50 is exposed from the sealing cap 100 and is connected to the power line 51 outside the sealing cap 100, so the sealing cap 100 will not move even if the power line 51 is moved. This makes it less likely for the sealing cap 100 to fall off than with conventional configurations, making it possible to provide a motor that is easy to assemble.

[0025] Furthermore, in the motor 1 according to the present disclosure, the sealing cap may be sandwiched between the power line and the partition wall (bracket 3). This configuration makes it even more difficult for the sealing cap to fall off.

[0026] Furthermore, in the motor 1 according to the present disclosure, the sealing cap 100 may have a recess U, and the connection point between the terminal portion 50 and the power line 51 may be sealed with resin within the recess U. With this configuration, the connection point is protected by the resin, and the terminal portion 50 and the power line 51 are less likely to move relative to the sealing cap 100. This makes it possible to provide a motor in which the sealing cap is less likely to fall off and which is easy to assemble.

[0027] Furthermore, in the motor 1 according to the present disclosure, the recess U may extend in the direction in which the power line 51 extends. This makes it possible to prevent interference between the power line 51 and the sealing cap 100.

[0028] Furthermore, in the motor 1 according to the present disclosure, the power line 51 may be connected to the terminal portion 50 by a crimp terminal 52, and the recess U may extend in the direction of extension of the crimp terminal 52. This makes it possible to prevent interference between the crimp terminal 52 and the sealing cap 100.

[0029] Furthermore, in the motor 1 according to the present disclosure, the partition wall (bracket 3) may be configured to separate the accommodation chamber R1 from the encoder chamber R2 that accommodates the encoder 40. This makes it possible to prevent oil leaking from the bearing from adhering to the encoder 40.

[0030] Although the embodiments of the present disclosure have been described above, the configuration of the present disclosure is not limited to the above. Another embodiment of the motor according to the present disclosure will be described with reference to Fig. 5. Fig. 5 is a partial cross-sectional view showing a motor 500 according to another embodiment of the present disclosure, taken from the same direction as Fig. 2. Note that the same reference numerals will be used to designate the same members as those in the embodiment shown in Figs. 1 to 4, and descriptions thereof will be omitted.

[0031] 2, in the embodiment shown in Fig. 5, the molded portion 22 of the stator 20 is accommodated in a cylindrical space (accommodation chamber R1) inside the motor housing 5, which is formed by the frame 2 and a partition wall (bracket 3). The molded portion 22 is provided with a terminal portion 50. A ring-shaped bracket 3 is fitted into an opening that opens upward in the motor housing 5. A hole 3a is formed in the bracket 3. In the embodiment shown in FIG. 5, the hole 3a formed in the bracket 3 is sealed with a sealing cap 300.

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

[0033] 5, the sealing cap 300 according to this embodiment is provided so as to be sandwiched between the molded section 22 and the bracket 3. More specifically, the sealing cap 300 is provided so as to be positioned and sandwiched between the molded section 22 and the bracket 3 in the axial direction of the motor 500. An outer edge portion 303 of the sealing cap 300 is provided so as to abut against the bottom surface of the bracket 3. In addition, a lower surface 305 of the sealing cap 300 is provided so as to abut against the upper surface 22b of the molded section 22.

[0034] Since the sealing cap 300 is sandwiched between the bracket 3 and the molded part 22, a compressive force acts on the sealing cap 300 from both the bracket 3 and the molded part 22. This brings the sealing cap 300 into close contact with the bracket 3 and the molded part 22, preventing oil from leaking from the accommodation chamber R1 to the outside.

[0035] The lower surface 305 of the sealing cap 300 is preferably provided across the inner circumferential surface 22a and the upper surface 22b of the molded section 22. For example, in the example shown in Fig. 5, the upper surface 22b of the molded section 22 is divided into an inner circumferential portion 223 where the terminal portions 50 are provided and an outer circumferential portion 224 where the terminal portions 50 are not provided. The sealing cap 300 is preferably provided so as to abut across the inner circumferential surface 22a and the outer circumferential portion 224 of the molded section 22. With the above configuration, the contact area between the sealing cap 300 and the molded section 22 is increased, thereby improving the adhesion between the sealing cap 300 and the molded section 22.

[0036] Furthermore, it is preferable that the lower surface 305 of the sealing cap 300, which contacts the upper surface 22b of the molded section 22, has a shape corresponding to the uneven shape of the upper surface 22b of the molded section 22. For example, in the upper surface 22b of the molded section 22 shown in Fig. 5, the inner peripheral portion 223 has a shape that is raised in the axial direction compared to the outer peripheral portion 224. In other words, a slope 226 that rises toward the inner diameter side is formed between the inner peripheral portion 223 and the outer peripheral portion 224. As shown in Fig. 5, the lower surface 305 of the sealing cap 300 has a portion that contacts the inner peripheral portion 223, a portion that contacts the slope 226, and a portion that contacts the outer peripheral portion 224, in accordance with the shape of the upper surface 22b of the molded section 22 described above. According to the above configuration, the sealing cap can be easily aligned in the radial direction and fixed to the upper surface of the molded portion, thereby providing a motor that is easy to assemble.

[0037] 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, so there is a large gap between the bracket 3 and the outer peripheral portion 224. The outer edge portion 303 fills this large gap, making it easy to prevent oil from leaking out of the accommodation chamber R1.

[0038] In the illustrated example, the inner edge portion 304 is thicker than the plate-shaped portion 301. An outer peripheral surface 304a of the inner edge portion 304 abuts against the inner peripheral surface 22a of the molded portion 22. The sealing cap 300 has the inner edge portion 304 and a portion that abuts against the inclined surface 226, which makes it easier for the sealing cap 300 to adhere closely to the molded portion 22.

[0039] A sealing cap 300 according to another embodiment will be described in detail with reference to Fig. 6. Fig. 6 is a perspective view showing a motor 500 according to another embodiment of the present disclosure. Fig. 6 shows the motor 500 in the middle of assembly, illustrating the state in which the sealing cap 300 is being placed on the terminal portions 50 provided on the molded portion 22. In the process of placing the sealing cap 300 on the upper surface 22b of the molded portion 22, the opening 302 of the sealing cap 300 needs to be positioned directly above the terminal portions 50 provided on the upper surface of the molded portion 22, and therefore, the sealing cap 300 needs to be aligned in the circumferential direction of the motor 500.

[0040] As shown in Fig. 6, the sealing cap 300 may have a configuration including a positioning protrusion 306 that fits into an opening 225 that is formed in the upper surface 22b of the molded section 22 during the molding process. The sealing cap 300 shown in Fig. 6 is configured such that, by inserting the positioning protrusion 306 into the opening 225, the opening 302 is positioned above the terminal section 50 of the molded section 22. With this configuration, the sealing cap 300 can be positioned in the circumferential direction simply by inserting the positioning protrusion 306 into the opening 225. This simplifies the positioning of the sealing cap 300 in the circumferential direction of the motor 500.

[0041] Although the embodiments of the present disclosure have been described above, the configuration of the present disclosure is not limited to the above. For example, the configuration of the present disclosure can be applied to any machine having a rotation mechanism that supports a rotor with bearings that use lubricating oil.

[0042] Although the embodiments of the present disclosure have been described above, it goes without saying that the technical scope of the present disclosure should not be interpreted as being limited by the description of the present embodiments. The present embodiments are merely examples, and it will be understood by those skilled in the art that various modifications of the embodiments are possible within the scope of the invention described in the claims. The technical scope of the present disclosure should be determined based on the scope of the invention described in the claims and its equivalents. [Explanation of symbols]

[0043] 1,500 motor 2 frames 2a Flange 2b Square tube part 3 Bracket 3a hole 4 Cover 5 Motor housing 10 rotors 11 Bearings 12 rotor core 12a York 12b Rotor magnet 20 Stator 21 Iron Core 22 Mold section 23 End section 30 shaft 40 Encoder 41 Encoder disk 42 Hub 43 Sensor Unit 50 Terminal section 51 Power line 52 Crimp terminal 100, 300 sealing cap 101 Bottom 102, 302 openings 102a First opening 102b Second opening 103 Edge 104 Projection 223 Inner circumference 224 Outer area 225 Aperture 301 Plate-shaped part 303 Outer edge 304 Inner edge 305 Bottom surface 306 Positioning protrusion R1 Containment Cell R2 Encoder Room

Claims

1. A motor having a housing that forms an accommodation chamber that accommodates a rotor and a stator, the housing has a partition wall separating the storage chamber from the outside, the partition wall is provided with a hole through which a terminal portion electrically connected to the stator is exposed, the hole is closed off between the accommodation chamber and the outside by an insulating sealing cap, At least a portion of the terminal portion is exposed from the sealing cap, and a power line that supplies power to the stator is connected outside the sealing cap.

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

3. the sealing cap has a recess; 3. The motor according to claim 1, wherein a connection portion between the terminal portion and the power line in the recess is sealed with resin.

4. The motor according to claim 3 , wherein the recess extends in a direction in which the power line extends.

5. 3. The motor according to claim 1, wherein the partition wall separates the housing chamber from an encoder chamber in which an encoder is housed.

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

7. The motor according to claim 1 , wherein the sealing cap is sandwiched between a molded portion that seals the stator with resin and the partition wall.

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

9. a terminal portion is provided on an inner peripheral portion of an upper surface of the molded portion, The motor according to claim 7 , wherein the sealing cap is in contact with an inner peripheral surface of the molded portion and an outer peripheral portion of the upper surface of the molded portion.

10. The motor according to claim 7 , wherein, in a cross-sectional view of a plane extending in the axial and radial directions of the motor, the lower surface of the sealing cap has a shape corresponding to the uneven shape of the upper surface of the molded portion.

11. The motor according to claim 10 , wherein the sealing cap has a positioning protrusion that fits into an opening provided in the upper surface of the molded portion.

12. The motor according to claim 11, wherein the opening is a trace of a pressing pin that is extended from the outside of a mold to press down the substrate when the stator is insert-molded.

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