Motor

Abstract

A motor according to one aspect of the present invention comprises: a rotor; a first stator and a second stator which are arranged across the rotor in the axial direction; a first bus bar connected to the first stator; a second bus bar connected to the second stator; a first connector part fixed to the first bus bar; a second connector part fixed to the second bus bar; a housing; a first cable connected to the first connector part; and a second cable connected to the second connector part. The housing is provided with: a first hole portion extending from the first connector portion toward one side in the axial direction; and a second hole portion extending from the second connector portion toward one side in the axial direction. The first cable passes through the first hole portion and is connected to the first connector portion from one side in the axial direction. The second cable passes through the second hole portion and is connected to the second connector portion from one side in the axial direction.

Description

Technical Field

[0001] This invention relates to a motor. Background Technology

[0002] In recent years, the development of motors that drive propellers of aircraft such as electric vertical takeoff and landing (e.g., Patent Document 1) has been continuously advancing. Such motors are positioned directly below the propeller. Therefore, in order not to obstruct the airflow generated by the propeller, it is required to minimize the axial projected area of ​​the motor.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2013-512149 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In such aircraft, the motor is sometimes connected to a cable that links to the control unit. In this case, the cable or its connection may obstruct the airflow from the propeller due to its protrusion relative to the motor's shape.

[0008] The present invention was made in view of the following problems, one of the objects of which is to provide a motor that realizes miniaturization of the connector section for cable connection.

[0009] Solution for solving the problem

[0010] One embodiment of the motor of the present invention comprises: a rotor rotatable about a central axis; a first stator axially opposed to the rotor and located on one axial side of the rotor; a second stator axially opposed to the rotor and located on the other axial side of the rotor; a first busbar connected to the first stator; a second busbar connected to the second stator; a first connector portion fixed to the first busbar; a second connector portion fixed to the second busbar; a housing housing the rotor, the first stator, the second stator, the first busbar, and the second busbar; a first cable connected to the first connector portion and led out to the outside of the housing; and a second cable connected to the second connector portion and led out to the outside of the housing. The housing provides: a first hole extending from the first connector portion toward one axial side; and a second hole extending from the second connector portion toward one axial side. The first cable passes through the first hole and is connected to the first connector portion from one axial side. The second cable passes through the second hole and is connected to the second connector portion from one axial side. The second connector portion is located radially outside the second stator. The second hole extends from the second connector portion, through the radially outer sides of the second stator and the first stator, to the axial side of the housing.

[0011] Invention Effects

[0012] According to one aspect of the present invention, a motor that achieves miniaturization of the connector portion for cable connection can be provided. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of a motor according to one embodiment.

[0014] Figure 2 This is a perspective view of a busbar unit and insulator in one embodiment.

[0015] Figure 3 yes Figure 1 An enlarged view of region III shown.

[0016] Figure 4 yes Figure 1 An enlarged view of region IV is shown.

[0017] Figure 5 It is a cross-sectional view showing a plurality of first busbars, a plurality of first connector portions, and a plurality of first cable connection portions in one embodiment. Detailed Implementation

[0018] Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and modifications can be made arbitrarily within the scope of the technical concept of the present invention. In each figure, the Z-axis is appropriately illustrated. The Z-axis is an imaginary axis parallel to the central axis J described later. Furthermore, the Z-axis is a vertical direction with the positive side designated as "upper side" and the negative side designated as "lower side". However, the posture of the motor relative to the vertical direction in this specification is merely an example for illustration and does not limit the posture of the motor during use.

[0019] Figure 1 This is a cross-sectional view of a motor 100 according to one embodiment.

[0020] The motor 100 in this embodiment is the motor included in the propulsion device 1000. The propulsion device 1000 is, for example, mounted on an aircraft. The propulsion device 1000 generates propulsion force for moving the aircraft. The propulsion device 1000 includes the motor 100 and the propeller 1100.

[0021] The propeller 1100 is mounted on the shaft 8 of the motor 100 and rotates about the central axis J by the motor 100. The propeller 1100 has a base 1110 fixed to the shaft 8 and a plurality of blade portions 1120 connected to the base 1110. The plurality of blade portions 1120 extend radially and are arranged at intervals in the circumferential direction.

[0022] The motor 100 of this embodiment includes a shaft 8, a pair of bearings 9A and 9B, a rotor 10, a pair of stators 20, a pair of busbar units 30, a plurality of connector sections 40, a pair of insulators 81 and 82, a housing 60, a bearing cover 90, a lower cover 99, a pair of cables 50, and a pair of cable covers 70.

[0023] The motor 100 of this embodiment is a dual-stator, single-rotor type axial clearance motor. Therefore, in this embodiment, the stator 20 and rotor 10 are axially opposed with a gap between them. A pair of stators 20 are arranged on both axial sides of the rotor 10. Furthermore, the motor 100 of this embodiment is a three-phase brushless motor. However, the number of phases of the drive power supply can be more than three. The total number can also be two phases. Hereinafter, each part of the motor 100 will be described in detail.

[0024] <rotor>

[0025] The rotor 10 can rotate about the central axis J. In this specification, the central axis J is an imaginary line extending in the vertical direction. In the following description, the axial direction of the central axis J is sometimes simply referred to as the "axial direction", the direction corresponding to the lower side of the axial direction is referred to as the "one side of the axial direction", and the direction corresponding to the upper side is referred to as the "other side of the axial direction". Moreover, in the following description, the radial direction centered on the central axis J is sometimes simply referred to as the "radial direction", and the circumferential direction centered on the central axis J is sometimes simply referred to as the "circumferential direction".

[0026] The rotor 10 is disposed between a pair of stators 20. The rotor 10 of this embodiment has a cage 11 and a plurality of rotor magnets 12. It should be noted that the configuration of the rotor 10 in this embodiment is an example and is not limited to this embodiment.

[0027] The retainer 11 is approximately annular about the central axis J. A central hole 11h is provided in the retainer 11, extending axially. The central hole 11h is approximately circular about the central axis J. Furthermore, the retainer 11 has a plurality of magnet receiving portions 11a. The magnet receiving portions 11a are holes extending axially through the retainer 11. The plurality of magnet receiving portions 11a are arranged at equal intervals in the circumferential direction.

[0028] Rotor magnets 12 are housed within distinct magnet housings 11a and fixed to a retainer 11. Multiple rotor magnets 12 are arranged at equal intervals in the circumferential direction. The rotor magnets 12 are axially opposed to the stator 20. Each rotor magnet 12 has magnetic poles with their magnetization direction facing the axial direction. In this example, the magnetic poles of adjacent rotor magnets 12 arranged in the circumferential direction are oriented opposite to each other. However, a Heilbeck array containing magnets arranged with their magnetic poles oriented in a manner deviating from the axial direction can also be used as the rotor magnet configuration.

[0029] <axis>

[0030] Shaft 8 is configured with its central axis aligned with the central axis J and extends axially. Shaft 8 is fixed to the inner circumferential surface of the central hole 11h of rotor 10. Shaft 8 rotates together with rotor 10 about the central axis J. Shaft 8 is supported by a pair of bearings 9A and 9B to allow it to rotate relative to housing 60. One bearing 9A is located lower (-Z) than rotor 10. The other bearing 9B is located higher (+Z) than rotor 10. A propeller 1100 is fixed to the upper end of shaft 8. Furthermore, a bearing cover 90 is fixed between the area on the outer circumferential surface of shaft 8 where the propeller 1100 is fixed and the area supported by bearing 9B.

[0031] <Stator>

[0032] The stator 20 is an annular shape surrounding the central axis J when viewed from the axial direction. One of the pair of stators 20 is located below the rotor 10 (-Z), and the other is located above the rotor 10 (+Z). According to this embodiment, the pair of stators 20 sandwich the rotor 10 in the middle and respectively form rotating magnetic flux, thereby enabling the rotor 10 to generate high torque.

[0033] In the following description, when distinguishing between the pair of stators 20, the one located on the lower side is referred to as the first stator 20A, and the one located on the upper side is referred to as the second stator 20B. That is, the motor 100 has a first stator 20A located on the lower side (-Z) of the rotor 10 and a second stator 20B located on the upper side (+Z) of the rotor 10 as stators 20. The first stator 20A and the second stator 20B have the same structure. Furthermore, the first stator 20A and the second stator 20B are arranged in an upside-down configuration.

[0034] Each stator 20 includes a stator core 21 and multiple coils 25. The stator core 21 is approximately annular about a central axis J. A shaft 8 is arranged radially inside the stator core 21. The stator core 21 has a back yoke 22 and teeth 23. The back yoke 22 is disc-shaped about a central axis J. The teeth 23 are columnar protrusions from the back yoke 22 toward the rotor 10. Multiple teeth 23 are arranged at equal intervals along the circumference.

[0035] The coil 25 is attached to the toothed portion 23 via an insulating member (e.g., insulating paper) not shown in the diagram. The coil 25 is, for example, composed of coil wire wound around the outer periphery of the toothed portion 23. In this embodiment, the plurality of coils 25 are classified into three-phase coils 25 corresponding to phases U, V, and W. Alternating currents with phases staggered by 120° flow in the three-phase coils 25 respectively.

[0036] <Busline Unit>

[0037] Figure 2 This is a perspective view of the busbar unit 30 and the insulator 81 in this embodiment. Figure 2 As shown, the busbar unit 30 has an annular portion 30a surrounding the central axis J and a protrusion 30b protruding radially outward from the annular portion 30a.

[0038] The busbar unit 30 has a plurality of busbars 31 and a busbar retainer 35. The busbar retainer 35 is made of an insulating resin material. The busbar retainer 35 supports the plurality of busbars 31. In this embodiment, the busbar retainer 35 has the plurality of busbars 31 embedded in it. That is, the busbar retainer 35 is formed by molding an insert in which the plurality of busbars 31 are disposed internally.

[0039] The busbar holder 35 has an annular support portion 35a supporting the busbar 31 at the annular portion 30a and a protruding support portion 35b supporting the busbar 31 at the protrusion portion 30b. The annular support portion 35a is annular about the central axis J. Furthermore, the protruding support portion 35b protrudes radially outward from the outer peripheral surface of the annular support portion 35a. At least a portion of all busbars 31 is embedded in the annular support portion 35a, and some busbars 31 are further embedded in the protruding support portion 35b.

[0040] like Figure 2 As shown, the multiple busbars 31 include multiple phase busbars 31U, 31V, 31W, a neutral point busbar 31D, and multiple inter-coil busbars 31E. Each of the multiple busbars 31 has one or more coil connection portions 31c. The multiple busbars 31 are connected to coils 25 at the coil connection portions 31c. That is, the multiple busbars are connected to the stator 20. The neutral point busbar 31D connects coils 25 of different phases to each other. The neutral point busbar 31D forms the neutral point of a star connection. The inter-coil busbars 31E connect two adjacent coils 25 in series in the circumferential direction. It should be noted that in this embodiment, the case where multiple coils 25 are interconnected by multiple busbars 31 to form a star connection is described. However, the multiple busbars 31 can also be configured to provide a delta connection for the multiple coils 25.

[0041] In this embodiment, the busbar unit 30 is provided with three phase busbars 31U, 31V, and 31W. Currents corresponding to the U, V, and W phases, respectively, and with different phases, flow in the three phase busbars 31U, 31V, and 31W. The phase busbars 31U, 31V, and 31W are connected to an external power source via a connector section 40 (described later) and a cable 50.

[0042] A portion of each phase busbar 31U, 31V, and 31W is embedded in the protruding support portion 35b. Furthermore, each phase busbar 31U, 31V, and 31W has a connecting end 31a that protrudes radially outward from the radially outer end of the protruding support portion 35b. That is, each phase busbar 31U, 31V, and 31W protrudes from the busbar holder 35 at the connecting end 31a. The connecting ends 31a of the three phase busbars 31U, 31V, and 31W are arranged circumferentially. The connecting end 31a is plate-shaped with the axial direction as its thickness direction. A through hole 31h is provided in the connecting end 31a. The three connecting ends 31a are accommodated in the insulator 81.

[0043] like Figure 1As shown, a pair of busbar units 30 are respectively connected to different stators 20. One of the pair of busbar units 30 is located on the lower side (-Z) of the rotor 10 and connected to the first stator 20A. The other of the pair of busbar units 30 is located on the upper side (+Z) of the rotor 10 and connected to the second stator 20B. In the following description, when distinguishing between the pair of busbar units 30, the one located on the lower side is referred to as the first busbar unit 30A, and the one located on the upper side is referred to as the second busbar unit 30B. Moreover, the plurality of busbars 31 of the first busbar unit 30A are referred to as the first busbar 31A, and the plurality of busbars 31 of the second busbar unit 30B are referred to as the second busbar 31B. That is, the motor 100 has a first busbar 31A connected to the first stator 20A and a second busbar 31B connected to the second stator 20B as busbars 31. The first busbar unit 30A and the second busbar unit 30B have the same structure. The first busbar unit 30A and the second busbar unit 30B are arranged in a flip-top, top-bottom, left-right, and right-side configuration. Furthermore, in the following description, the axis extending axially through the center of the through hole 31h of the first busbar 31A is referred to as the first axis J1, and the axis extending axially through the center of the through hole 31h of the second busbar 31B is referred to as the second axis J2.

[0044] Connectors, cables, and insulators

[0045] The connector section 40 is fixed to the connection end 31a of the first busbar 31A and the second busbar 31B, respectively. Furthermore, cables 50 are connected to the connector section 40. The connector section 40 is made of a metal material with excellent conductivity, such as a copper alloy.

[0046] In the following description, the connector portion 40 fixed to the first busbar 31A is referred to as the first connector portion 40A, and the connector portion 40 fixed to the second busbar 31B is referred to as the second connector portion 40B. The connecting ends 31a of the three first busbars 31A are arranged circumferentially. Therefore, a plurality of first connector portions 40A are arranged circumferentially. Similarly, the connecting ends 31a of the three second busbars 31B are arranged circumferentially. Therefore, a plurality of second connector portions 40B are arranged circumferentially.

[0047] Figure 3 yes Figure 1 An enlarged view of region III shown. Figure 3 This is a diagram showing the connection portion of the first busbar 31A, the first connector section 40A, and the cable 50.

[0048] The first connector portion 40A is fixed to the connecting end 31a of the first busbar 31A. The first connector portion 40A has a cylindrical portion 41 and a flange portion 42. The cylindrical portion 41 is inserted into the through hole 31h of the first busbar 31A. The cylindrical portion 41 is cylindrical with the first axis J1 as its center. The flange portion 42 protrudes radially outward from the lower (-Z) end of the cylindrical portion 41 towards the first axis J1.

[0049] The cylindrical portion 41 has an internal thread portion 41a on its inner circumferential surface and a crimping portion 41b that bulges outward relative to the first axis J1. The internal thread portion 41a of the first connector portion 40A is located at a position (+Z) above the crimping portion 41b.

[0050] The crimping portion 41b is provided around the entire circumference of the outer peripheral surface of the cylindrical portion 41, centered on the first axis J1. The crimping portion 41b has a first crimping portion 41ba, a second crimping portion 41bb, and a third crimping portion 41bc. The first crimping portion 41ba is an annular shape protruding radially outward from the outer peripheral surface of the cylindrical portion 41. The second crimping portion 41bb is located axially closer to the connecting end 31a (i.e., lower) than the first crimping portion 41ba. The second crimping portion 41bb is also an annular shape protruding radially outward from the outer peripheral surface of the cylindrical portion 41. The third crimping portion 41bc connects the radially outer ends of the first crimping portion 41ba and the second crimping portion 41bb to each other. The connecting end 31a is sandwiched between the second crimping portion 41bb and the flange portion 42. That is, the crimping portion 41b sandwiches the connecting end 31a between itself and the flange portion 42.

[0051] In this embodiment, the crimping portion 41b is formed by plastically deforming the cylindrical portion 41 after it is inserted into the through hole 31h. That is, the crimping portion 41b is formed by crimping. The first connector portion 40A is fixed to the first busbar 31A and electrically connected to the first busbar 31A by clamping the connecting end 31a in the axial direction with the crimping portion 41b and the flange portion 42.

[0052] Cable 50 is connected to connector portion 40. In the following description, cable 50 connected to first connector portion 40A will be referred to as first cable 50A. First cable 50A has a first terminal 51 and cable body 53.

[0053] The first terminal 51 is provided at the head end of the first cable 50A. The first terminal 51 is threaded and screwed into the internal thread 41a of the first connector portion 40A. The first terminal 51 has an external thread portion 51a, a terminal flange portion 51b, and a terminal connection portion 51c.

[0054] The external thread portion 51a is inserted into the internal thread portion 41a. The terminal flange portion 51b protrudes radially outward from the lower end of the external thread portion 51a. The terminal flange portion 51b contacts the flange portion 42 of the connector portion 40 when the external thread portion 51a is inserted into or screwed into the internal thread portion 41a. The terminal connection portion 51c is located below the external thread portion 51a and the terminal flange portion 51b (-Z). The terminal connection portion 51c is connected to the cable body 53.

[0055] The cable body 53 has a copper wire portion 53a and a covering portion 53b surrounding the copper wire portion 53a. The copper wire portion 53a is fixed to and electrically connected to the first terminal 51. In this embodiment, the copper wire portion 53a is connected to the first terminal 51 by being clamped into the crimped terminal connection portion 51c. Other methods of connecting the first terminal 51 and the copper wire portion 53a include brazing and fusion welding.

[0056] A conductive material 49 is sandwiched between the internal thread portion 41a of the first connector portion 40A and the external thread portion 51a of the first terminal 51. The conductive material 49 is, for example, a conductive strip or a conductive paste. When the conductive material 49 is a conductive strip, the strip, as the conductive material 49, is wound around the outer peripheral surface of the external thread portion 51a and inserted into the internal thread portion 41a together with the external thread portion 51a. Alternatively, when the conductive material 49 is a conductive paste, the paste, as the conductive material 49, is applied to the outer peripheral surface of the external thread portion 51a and inserted into the internal thread portion 41a together with the external thread portion 51a.

[0057] Figure 4 yes Figure 1 An enlarged view of region IV is shown. Figure 4 This is a diagram showing the connection between the second busbar 31B and the cable 50.

[0058] The second connector portion 40B is fixed to the connecting end 31a of the second busbar 31B. The second connector portion 40B and the first connector portion 40A (see reference) Figure 3 Similarly, the first connector portion 40A is arranged with a cylindrical portion 41 and a flange portion 42, and is flipped vertically. The cylindrical portion 41 is inserted into the through hole 31h of the second busbar 31B. The cylindrical portion 41 is cylindrical with the second axis J2 as its center. The flange portion 42 protrudes radially outward from the upper (+Z) end of the cylindrical portion 41 towards the second axis J2.

[0059] The cylindrical portion 41 has an internally threaded portion 41a on its inner circumferential surface and a crimping portion 41b that bulges radially outward relative to the second axis J2. The internally threaded portion 41a of the second connector portion 40B is located at a position lower (-Z) than the crimping portion 41b. The crimping portion 41b is provided around the second axis J2 and extends along the entire circumference of the outer circumference of the cylindrical portion 41. The crimping portion 41b clamps the connecting end 31a between itself and the flange portion 42. Thus, the crimping portion 41b is formed by plastically deforming the cylindrical portion 41 after it is inserted into the through hole 31h. The second connector portion 40B is fixed to the second busbar 31B by clamping the connecting end 31a axially between the crimping portion 41b and the flange portion 42. Furthermore, the second connector portion 40B is electrically connected to the second busbar 31B.

[0060] A cable 50 is connected to the second connector section 40B. In the following description, the cable 50 connected to the second connector section 40B will be referred to as the second cable 50B. The second cable 50B has a second terminal 52 and a cable body 53.

[0061] The second terminal 52 is located at the head end of the second cable 50B. The second terminal 52 and the first terminal 51 (see reference) Figure 3 Similarly, the second terminal 52 is threaded and screwed into the internal thread 41a of the second connector portion 40B. The second terminal 52 has: an external thread 52a, which is inserted into the internal thread 41a; a terminal flange 52b, which contacts the lower end face of the cylindrical portion 41; and a terminal connecting portion 52c, which is connected to the cable body 53. In this example, the terminal connecting portion 52c is a copper cylinder, but it could also be a copper or aluminum rod. Furthermore, a conductive material 49, which is a conductive strip or conductive paste, is sandwiched between the internal thread 41a of the second connector portion 40B and the external thread 52a of the second terminal 52.

[0062] The connector portion 40 of this embodiment can be easily connected to the busbar 31 by forming a crimp portion 41b. Therefore, as a process for connecting the connector portion 40 to the busbar 31, there is no need to perform processes involving heating, such as brazing or welding, which simplifies the connection process. As a result, the motor 100 can be manufactured at a low cost.

[0063] According to this embodiment, the connector portion 40 is a cylindrical shape extending axially. Furthermore, the connector portion 40 is connected to the cable 50 by inserting it axially. According to this embodiment, when the motor 100 is viewed axially, the connector portion 40 and the cable 50 connected to it are less likely to protrude radially. As a result, the projected area of ​​the motor 100 in the axial direction can be reduced.

[0064] According to this embodiment, the cable 50 can be connected to the connector 40 by screwing the external thread portion 51a of the cable 50 into the internal thread portion 41a of the connector 40. Therefore, the connection process of the cable 50 to the connector 40 is simplified. Furthermore, the connection of the cable 50 to the connector 40 can be easily disconnected, thus facilitating easy maintenance of the motor 100, including parts replacement.

[0065] According to this embodiment, conductive material 49 is sandwiched between the internal thread portion 41a and the external thread portion 51a, filling the tiny gap between them. This ensures a larger connection area between the first connector portion 40A and the first terminal 51, thereby reducing the resistance between them.

[0066] <Insulator>

[0067] like Figure 1 As shown, an insulator 81 is installed in the first busbar unit 30A. An insulator 82 is installed in the second busbar unit 30B. Insulators 81 and 82 are made of insulating resin material. Insulators 81 and 82 are supported on the housing 60. In the following description, the insulator installed in the first busbar unit 30A is referred to as the first insulator 81, and the insulator fixed to the second busbar unit 30B is referred to as the second insulator 82.

[0068] like Figure 2 As shown, the first insulator 81 is provided with a plurality of first openings 81a that open toward the radially inward side and a plurality of second openings 81b that open toward the lower side (-Z).

[0069] The first opening 81a opens radially inward. A plurality of first openings 81a are arranged circumferentially. The connecting ends 31a of phase busbar 31U, phase busbar 31V and phase busbar 31W are respectively inserted into the plurality of first openings 81a.

[0070] A first opening 81a and a second opening 81b are interconnected to form a first connecting space 83. That is, in this embodiment, the first insulator 81 is provided with three first connecting spaces 83 arranged circumferentially. Different connecting ends 31a are respectively arranged in the three first connecting spaces 83.

[0071] Figure 5 This is a cross-sectional view showing the connection portion of the plurality of first busbars 31A, the plurality of first connector sections 40A, and the plurality of first cables 50A. (See attached image.) Figure 5 As shown, the first insulator 81 has an enclosing wall portion 84 and two dividing wall portions (wall portions) 85.

[0072] The surrounding wall portion 84 covers the three first communicating spaces 83. The surrounding wall portion 84 is disposed between the housing 60 and the first communicating spaces 83. The surrounding wall portion 84 insulates the connection ends 31a of the phase busbars 31U, 31V, and 31W respectively disposed in the three first communicating spaces 83 from the housing 60.

[0073] The dividing wall 85 divides the adjacent first connecting spaces 83 from each other. The dividing wall 85 is located between the connection ends 31a of the different phase busbars 31U, 31V, and 31W. The dividing wall 85 insulates the connection ends 31a from each other. Furthermore, the dividing wall 85 insulates the connector portions 40 connected to each connection end 31a from each other. According to this embodiment, it is easy to ensure insulation between the busbars 31 with currents flowing in different phases, which improves the reliability of the motor 100. In addition, since the insulation between the connection ends 31a can be ensured by the dividing wall 85, the connection ends 31a can be arranged close to each other. As a result, the motor 100 can be miniaturized.

[0074] like Figure 4 As shown, the second insulator 82 has a first component 82P and a second component 82Q. The first component 82P is mounted on the second busbar unit 30B. The second component 82Q is located below (-Z) the first component 82P and is mounted on the first component 82P.

[0075] The second insulator 82 has a plurality of (three) first openings 82a opening radially inward, a plurality of (three) second openings 82b opening downward (-Z), and a plurality of (three) third openings 82c opening upward (+Z). One first opening 82a, one second opening 82b, and one third opening 82c are interconnected, forming a second connecting space 88. That is, the first member 82P has a plurality of (three) second connecting spaces 88. The three second connecting spaces 88 are circumferentially (i.e., Figure 4 The circuits are arranged along the depth direction of the paper. Different phase busbars 31U, 31V, and 31W are respectively arranged in the three second connecting spaces 88. Although not shown in the figure, they are connected to the first insulator 81 (see reference). Figure 5 Similarly, the first member 82P is provided with a wall that divides the adjacent second connecting spaces 88 from each other. The wall is located between the connection ends 31a of the different phase busbars 31U, 31V, and 31W, so that they are insulated from each other.

[0076] The second member 82Q is a cylindrical shape extending axially. The second member 82Q extends the second opening 82b of the first member 82P downward (-Z). The upper end of the second member 82Q is connected to the second opening 82b. Furthermore, the lower end of the second member 82Q opens downward (-Z) at the lower end of the housing 60.

[0077] <Shell>

[0078] like Figure 1 As shown, housing 60 houses shaft 8, a pair of bearings 9A and 9B, rotor 10, a pair of stators 20, a pair of busbar units 30, multiple connector sections 40, and a pair of insulators 81 and 82.

[0079] The housing 60 has a first housing member 61, a second housing member 62, and a cover member 63. The second housing member 62 is located above the first housing member 61. The cover member 63 is located above the second housing member 62. The first housing member 61 and the second housing member 62 are fixed to each other. Furthermore, the cover member 63 is fixed to the second housing member 62. In this embodiment, the first housing member 61, the second housing member 62, and the cover member 63 are made of a metallic material such as aluminum. The first housing member 61, the second housing member 62, and the cover member 63 may also be made of a material other than a metallic material such as resin.

[0080] The first housing member 61 has a first peripheral wall portion 61d, a first bearing cage portion 61a, and a lower wall portion 61e. The first peripheral wall portion 61d is generally cylindrical, extending axially about the central axis J. The first peripheral wall portion 61d surrounds the first stator 20A from the radially outer side. The lower wall portion 61e is generally annular, centered on the central axis J. The lower wall portion 61e connects the outer peripheral surface of the first bearing cage portion 61a to the lower end of the first peripheral wall portion 61d. The lower wall portion 61e covers the first stator 20A from the lower side.

[0081] The first peripheral wall portion 61d is provided with a first through hole portion 61h and a first hole portion 60a. The first hole portion 60a and the first through hole portion 61h are located on opposite sides of the radial direction, separated by the central axis J. The first through hole portion 61h extends axially and penetrates the first peripheral wall portion 61d.

[0082] The first bearing cage portion 61a is positioned lower than the first stator 20A. The first bearing cage portion 61a is cylindrical, surrounding the central axis J from the radially outer side. The first bearing cage portion 61a holds the bearing 9A. A lower cover 99, covering the lower end of the bearing 9A and the shaft 8, is fixed to the lower end face of the first bearing cage portion 61a.

[0083] The second housing member 62 has a second peripheral wall portion 62d, a second bearing cage portion 62a, and an upper wall portion 62e. The second peripheral wall portion 62d is generally cylindrical, extending axially around the central axis J. The second peripheral wall portion 62d surrounds the second stator 20B from the radially outer side. The lower end of the second peripheral wall portion 62d is fixed to the upper end of the first peripheral wall portion 61d. The upper wall portion 62e is generally annular, centered on the central axis J. The upper wall portion 62e connects the outer peripheral surface of the second bearing cage portion 62a to the upper end of the second peripheral wall portion 62d. The upper wall portion 62e covers the second stator 20B from the upper side (+Z).

[0084] A second through hole 62h is provided in the second peripheral wall portion 62d. The second through hole 62h extends axially and penetrates the second peripheral wall portion 62d. The lower end of the second through hole 62h is connected to the first through hole 61h. The first through hole 61h and the second through hole 62h constitute the second hole portion 60b. The upper opening of the second through hole 62h is sealed by a cover member 63. By removing the cover member 63 from the second housing member 62, the internal space of the second hole portion 60b can be exposed to the upper side, allowing the second connector portion 40B disposed inside the second hole portion 60b to be assembled or replaced from the upper side.

[0085] The second bearing retainer portion 62a is positioned above the second stator 20B. The second bearing retainer portion 62a is cylindrical, surrounding the central axis J from the radially outward side. The second bearing retainer portion 62a holds the bearing 9B. That is, the housing 60 has a cylindrical second bearing retainer portion 62a that holds the bearing 9B. The second bearing retainer portion 62a has an upper surface 62b facing upward (+Z) and an outer peripheral surface 62c facing radially outward. On the upper surface 62b, an annular groove 62g extending circumferentially around the central axis J is provided.

[0086] Next, the first hole 60a and the second hole 60b provided in the housing 60 will be described in detail. The first hole 60a and the second hole 60b are provided in the peripheral wall portions (first peripheral wall portion 61d and second peripheral wall portion 62d) that surround the internal space of the housing 60 from the radially outer side. The first hole 60a is located radially outer of the first stator 20A. The second hole 60b is located radially outer of the first stator 20A and the second stator 20B. The first hole 60a and the second hole 60b are located on opposite sides of the radial axis J.

[0087] Both the first hole 60a and the second hole 60b extend axially. The first hole 60a and the second hole 60b open on the downward-facing surface of the housing 60 (hereinafter, the lower end surface 60f). In the following context, the opening of the first hole 60a on the lower end surface 60f is referred to as the first hole opening 60e. Conversely, the opening of the second hole 60b on the lower end surface 60f is referred to as the second hole opening 60i.

[0088] like Figure 3 As shown, the first hole portion 60a has an axially elongated portion 60c and a radially extended portion 60d. The axially elongated portion 60c extends axially and opens downward (-Z) at the first hole opening portion 60e located on the lower end face 60f of the housing 60. The radially extended portion 60d extends radially inward to connect the internal space of the housing 60 with the axially elongated portion 60c. The first hole portion 60a extends from the first connector portion 40A, passes radially outward from the first stator 20A, and reaches the lower side (-Z) of the housing 60.

[0089] The head end of the protrusion 30b of the first busbar unit 30A is inserted radially inward into the radial extension 60d. Thus, a plurality of connecting ends 31a located at the head end of the protrusion 30b and a first connector portion 40A fixed to the connecting ends 31a are disposed inside the first hole portion 60a. Therefore, the first connector portion 40A is located radially outward of the first stator 20A. In this embodiment, the first connector portion 40A is located directly above the first hole opening 60e. That is, the first connector portion 40A overlaps with the first hole opening 60e when viewed axially. The first hole portion 60a extends downward (-Z) from the first connector portion 40A.

[0090] A first cable 50A is inserted from the first opening 60e into the first hole 60a. The first terminal 51 of the first cable 50A is connected to the first connector 40A inside the first hole 60a. That is, the first cable 50A passes through the first hole 60a and is connected to the first connector 40A from the lower side (-Z).

[0091] A first insulator 81 is disposed inside the first hole 60a. The surrounding wall 84 of the first insulator 81 covers the inner surface of the first hole 60a. A connecting end 31a passes through the first opening 81a of the first insulator 81, and a first cable 50A passes through the second opening 81b. Furthermore, the connecting end 31a, the first connector portion 40A, and the first terminal 51 are disposed in the first communicating space 83 of the first insulator 81. The first insulator 81 insulates the connecting end 31a, the first connector portion 40A, and the first terminal 51 relative to the housing 60.

[0092] like Figure 4As shown, the second hole portion 60b has an axially elongated portion 60g and a radially extended portion 60h. The axially elongated portion 60g extends axially and opens downward (-Z) at the second hole opening portion 60i located on the lower end face 60f of the housing 60. The radially extended portion 60h extends radially inward to connect the internal space of the housing 60 with the axially elongated portion 60g. The second hole portion 60b extends from the second connector portion 40B, through the radially outer side of the second stator 20B and the first stator 20A, to the lower side (-Z) of the housing 60.

[0093] The head end of the protrusion 30b of the second busbar unit 30B is inserted radially inward into the radial extension 60h. Thus, a plurality of connecting ends 31a located at the head end of the protrusion 30b and a second connector portion 40B fixed to the connecting ends 31a are disposed inside the second hole portion 60b. Therefore, the second connector portion 40B is located radially outward of the second stator 20B. In this embodiment, the second connector portion 40B is located directly above the second hole opening portion 60i. That is, the second connector portion 40B overlaps with the second hole opening portion 60i when viewed axially. Therefore, the second hole portion 60b extends downward (-Z) from the second connector portion 40B.

[0094] The second cable 50B is inserted from the second hole opening 60i into the second hole 60b. The second terminal 52 of the second cable 50B is connected to the second connector 40B inside the second hole 60b. That is, the second cable 50B passes through the second hole 60b and is connected to the second connector 40B from the lower side (-Z).

[0095] A second insulator 82 is disposed inside the second hole 60b. Similar to the first insulator 81, a connecting end 31a, a second connector portion 40B, and a second terminal 52 are disposed in the second communicating space 88 of the second insulator 82. The second insulator 82 insulates the connecting end 31a, the second connector portion 40B, and the second terminal 52 from the housing 60.

[0096] like Figure 1As shown, according to this embodiment, the housing 60 is provided with a first hole 60a and a second hole 60b extending axially and opening downward at the lower end of the housing 60. Furthermore, a first cable 50A is connected to a first busbar 31A via a first connector 40A inside the first hole 60a and extends downward to the lower part of the housing 60. Similarly, a second cable 50B is connected to a second busbar 31B via a second connector 40B inside the second hole 60b and extends downward to the lower part of the housing 60. Therefore, the connector 40 and the cable 50 can be prevented from protruding radially outward relative to the housing 60. That is, according to this embodiment, the radially protruding connector 40 of the motor 100 can be miniaturized. As a result, the axial projected area of ​​the motor 100 is reduced, and the motor 100 located below the propeller 1100 can be prevented from obstructing the downward airflow from the propeller 1100.

[0097] According to this embodiment, the first opening 60e of the first hole 60a and the second opening 60i of the second hole 60b both face downwards. Furthermore, the first cable 50A and the second cable 50B extend downwards from the lower end face 60f of the housing 60. Therefore, when the propulsion device 1000 is used outdoors, rainwater and other moisture are less likely to enter the interior of the housing 60 through the first opening 60e and the second opening 60i. According to this embodiment, the waterproof reliability of the motor 100 can be improved.

[0098] <Bearing Cover>

[0099] The bearing cover 90 is located on the upper side (+Z) of the second bearing cage portion 62a. In this embodiment, the bearing cover 90 is made of metal and is formed by stamping. However, the bearing cover 90 may also be made of resin.

[0100] The bearing cover 90 has a cover body portion 91, an annular protrusion 92, a cylindrical portion 93, and a fixed cylindrical portion 94. The cover body portion 91 is plate-shaped with the thickness direction along the axial direction. The cover body portion 91 is circular with the central axis J as the center. The cover body portion 91 is axially opposed to the upper surface 62b of the bearing 9B and the second bearing cage portion 62a. A circular through hole 91h for the shaft 8 to pass through is provided in the center of the cover body portion 91.

[0101] The fixed cylindrical portion 94 is a cylindrical shape that protrudes upward (+Z) from the inner edge of the through hole 91h. The inner circumferential surface of the fixed cylindrical portion 94 is sealed to the outer circumferential surface of the shaft 8 by a sealing material or the like. A radially penetrating fixing hole is provided in the fixed cylindrical portion 94. A fixing screw 8a is inserted into the fixing hole. Furthermore, the fixing screw 8a is screwed into a threaded hole on the outer circumferential surface of the shaft 8. Thus, the bearing cover 90 is fixed to the outer circumferential surface of the shaft 8. Furthermore, the bearing cover 90 rotates together with the shaft 8 around the central axis J.

[0102] An annular protrusion 92 is provided on the main body portion 91. The annular protrusion 92 protrudes downward (-Z) relative to the main body portion 91. The annular protrusion 92 is annular in shape with the central axis J as the center. The annular protrusion 92 is inserted into the groove 62g of the second bearing retainer portion 62a. The lower end of the annular protrusion 92 is positioned inside the groove 62g and faces the bottom surface of the groove 62g with a gap.

[0103] The cylindrical portion 93 is cylindrical with the central axis J as its center. The cylindrical portion 93 is connected to the outer edge of the cover body portion 91. Therefore, the cylindrical portion 93 is located radially outside the annular protrusion 92. The cylindrical portion 93 protrudes downward (-Z) relative to the cover body portion 91. The cylindrical portion 93 surrounds the outer peripheral surface 62c of the second bearing retainer portion 62a from the radially outer side.

[0104] The motor 100 according to this embodiment has a bearing cover 90 fixed to a shaft 8, extending radially outward from the shaft 8, and covering the bearing 9B from the upper side (+Z). Specifically, in this embodiment, the upper end of the shaft 8 extends upward from the housing 60 and is fixed to the propeller 1100. Therefore, the bearing 9B is exposed on the upper side. As in this embodiment, in the motor 100 used to rotate the propeller 1100, rainwater or other water droplets can easily intrude from the upper side. According to this embodiment, by covering the bearing 9B from the upper side with the bearing cover 90, moisture falling onto the bearing 9B can be prevented, thus preventing damage to the lubrication of the bearing 9B. Furthermore, it can prevent moisture from intruding into the stator 20 and rotor 10 inside the housing 60 through the bearing 9B, thereby improving the reliability of the motor 100.

[0105] In particular, the bearing cover 90 of this embodiment has a shape that follows the surface shape of the second bearing cage portion 62a. That is, the bearing cover 90 has: a cover body portion 91 and an annular protrusion 92, the cover body portion 91 extending along the upper surface 62b of the second bearing cage portion 62a and the annular protrusion 92 extending along the groove portion 62g of the upper surface 62b; and a cylindrical portion 93 extending along the outer peripheral surface 62c. Therefore, the gap between the bearing cover 90 and the second bearing cage portion 62a, which may become a path for moisture infiltration, can be designed as an intricate labyrinth structure. As a result, moisture can be prevented from infiltrating radially inward from the radially outer end of the gap between the bearing cover 90 and the second bearing cage portion 62a.

[0106] <Cable Cover>

[0107] like Figure 5 As shown, the cable cover 70 is fixed to the lower end face 60f of the housing 60. The cable cover 70 surrounds the cable 50 radially outward relative to the first axis J1. Here, based on Figure 5The cable cover 70 installed on the first cable 50A will be described. It should be noted that the cable cover 70 is also installed on the second cable 50B. The cable cover 70 installed on the second cable 50B has the same configuration as the cable cover 70 installed on the first cable 50A.

[0108] In this embodiment, the cable 50 is inserted into the interior of the housing 60 and connected to the busbar 31 inside the housing 60. The cable cover 70 in this embodiment functions as a waterproof cover to prevent moisture from entering the interior of the housing 60 along the outer periphery of the cable 50. Furthermore, in this embodiment, the cable 50 is connected to the busbar 31 by screwing the external thread 51a of its first terminal 51 (or second terminal 52) into the internal thread 41a of the connector portion 40. The cable cover 70 in this embodiment functions as an anti-loosening component to prevent the cable 50 from rotating circumferentially along the external thread 51a.

[0109] The cable cover 70 has a base member 71, three cap members 72, three first sealing members 76 and a second sealing member 77.

[0110] The base member 71 is fixed to the housing 60. The base member 71 has three cylindrical threaded portions 71a and one flange portion 71c.

[0111] Three cylindrical threaded portions 71a are cylindrical, extending axially around the first axis J1. Therefore, the three cylindrical threaded portions 71a are arranged circumferentially. The inner diameter of the cylindrical threaded portion 71a is slightly larger than the outer diameter of the cable body 53 and the terminal connection portion 51c. A cable 50 is inserted inside the cylindrical threaded portion 71a. The cylindrical threaded portion 71a surrounds the cable 50 radially outward from the first axis J1. An external threaded portion 71b is provided on the outer circumferential surface of the cylindrical threaded portion 71a.

[0112] A flange portion 71c protrudes radially outward from the upper end of the cylindrical threaded portion. The flange portion 71c is plate-shaped and extends along a plane orthogonal to the axial direction. The upper surface of the flange portion 71c contacts the lower end face 60f of the housing 60. On the lower end face 60f of the housing 60, a groove portion 60k is provided that surrounds the first hole opening 60e when viewed axially. Furthermore, an annular second sealing member 77 is disposed in the groove portion 60k. Therefore, the second sealing member 77 surrounds the first hole opening 60e when viewed axially. The second sealing member 77 is made of an elastic member, for example, rubber or an elastomer resin. The upper surface of the flange portion 71c covers the groove portion 60k. The upper surface of the flange portion 71c is sandwiched between the upper surface of the flange portion 71c and the bottom surface of the groove portion 60k. That is, the second sealing member 77 is sandwiched between the flange portion 71c and the lower end face 60f of the housing 60. According to this embodiment, by sealing the flange portion 71c and the housing 60 with the second sealing member 77, moisture can be prevented from entering the interior of the housing 60 from between the flange portion 71c and the housing 60.

[0113] The cap member 72 is fixed to the base member 71. The cap member 72 is cylindrical with the first axis J1 as its center. The cap member 72 has a nut portion 72a, a retaining sleeve portion 72c, and an inner protrusion 72d.

[0114] The nut portion 72a is annular about the first axis J1. An internal thread portion 72b is formed on the inner circumferential surface of the nut portion 72a. Furthermore, the outer circumferential surface of the nut portion 72a is preferably hexagonal to allow the cap member 72 to rotate. The external thread portion 71b of the cylindrical thread portion 71a engages with the internal thread portion 72b. The external thread portion 71b of the cylindrical thread portion 71a is inserted into the nut portion 72a.

[0115] The retaining sleeve 72c is cylindrical and surrounds the first axis J1. The retaining sleeve 72c extends downward (-Z) from the nut portion 72a. The retaining sleeve 72c surrounds the outer peripheral surface of the cable body 53 radially outward from the first axis J1 with a gap.

[0116] The inner protrusion 72d is annular and surrounds the first axis J1. The inner protrusion 72d protrudes radially inward from the lower part of the retaining sleeve 72c towards the first axis J1. The inner diameter of the inner protrusion 72d is slightly larger than the outer diameter of the cable body 53. The upper surface of the inner protrusion 72d is axially opposed to the lower surface of the cylindrical threaded portion 71a.

[0117] The first sealing member 76 is annular about the first axis J1. The first sealing member 76 is made of an elastic member such as rubber or elastomeric resin. In this embodiment, the first sealing member 76 is a cylindrical member extending axially. The first sealing member 76 is disposed inside the retaining cylinder portion 72c. The first sealing member 76 surrounds the cable body 53 radially outward from the first axis J1. That is, the first sealing member 76 is disposed radially between the cable body 53 and the retaining cylinder portion 72c. Furthermore, the first sealing member 76 is disposed axially between the lower surface of the cylindrical threaded portion 71a and the upper surface of the inner protrusion 72d. That is, the first sealing member 76 is sandwiched radially inward between the retaining cylinder portion 72c and the cylindrical threaded portion 71a and the inner protrusion 72d.

[0118] In this embodiment, by gradually screwing the nut portion 72a of the cap member 72 into the external thread portion 71b of the cylindrical thread portion 71a, the upper surface of the inner protrusion 72d gradually approaches the lower surface of the cylindrical thread portion 71a. As a result, the first sealing member 76 is pressed against the lower side of the cylindrical thread portion 71a, sealing the lower surface of the cylindrical thread portion 71a and preventing moisture from seeping in along the lower surface of the cylindrical thread portion 71a. Furthermore, the first sealing member 76 is axially compressed between the upper surface of the inner protrusion 72d and the lower surface of the cylindrical thread portion 71a. The axially compressed first sealing member 76 is pressed against the outer peripheral surface of the cable body 53. Thus, the first sealing member 76 seals the outer peripheral surface of the cable body 53, preventing liquid from intruding into the interior of the housing 60 along the outer peripheral surface of the cable body 53. Moreover, by pressing the first sealing member 76 against the outer peripheral surface of the cable body 53, rotation of the cable 50 around the first axis J1 is prevented. This prevents the first terminal 51 of the cable 50 from becoming loose relative to the connector portion 40.

[0119] The embodiments and variations of the present invention have been described above. However, the various components and combinations thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other changes to the components can be made without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments.

[0120] The motor using this invention can be applied to various devices. For example, it can be applied to rotating electric machines such as generators equipped with propellers that rotate when exposed to wind. In this case, the rotating electric machine can also be a three-phase AC generator. The application of the rotating electric machine is not particularly limited. The various configurations described above can be appropriately combined without contradiction.

[0121] It should be noted that this technology can be configured as follows.

[0122] (A1) A motor, comprising:

[0123] The rotor can rotate around its central axis;

[0124] The first stator is axially opposed to the rotor and located on one side of the rotor's axial direction;

[0125] The second stator is axially opposite to the rotor and located on the other side of the rotor's axial direction;

[0126] The first busbar is connected to the first stator;

[0127] The second busbar is connected to the second stator;

[0128] The first connector portion is fixed to the first busbar;

[0129] The second connector is fixed to the second busbar;

[0130] The housing accommodates the rotor, the first stator, the second stator, the first busbar, and the second busbar;

[0131] A first cable is connected to the first connector and led out to the outside of the housing; and

[0132] The second cable is connected to the second connector and led out to the outside of the housing;

[0133] The housing is provided with:

[0134] A first hole extends from the first connector portion toward one axial direction; and

[0135] The second hole extends from the second connector portion toward one axial side;

[0136] The first cable passes through the first hole and is connected to the first connector from the axial side.

[0137] The second cable passes through the second hole and is connected to the second connector from the axial side.

[0138] The second connector portion is located radially outside the second stator.

[0139] The second hole extends from the second connector portion, through the radially outer sides of the second stator and the first stator, to the axial side of the housing.

[0140] (A2) The motor according to (A1), wherein,

[0141] The motor includes a cable cover that surrounds at least one of the first cable or the second cable from the radially outer side relative to an axis extending axially.

[0142] The cable cover has the following features:

[0143] The base component is fixed to the housing;

[0144] The cap component is fixed to the base component; and

[0145] The first sealing component is in the shape of a ring;

[0146] The base member has a cylindrical threaded portion that surrounds the cable radially outward from the axis, and has an external threaded portion on its outer circumferential surface.

[0147] The cap component has:

[0148] Nut portion, into which the external thread portion is inserted;

[0149] The retaining cylindrical portion, being cylindrical and surrounding the axis, extends axially from the nut portion; and

[0150] An annular inner protrusion protrudes radially inward from one end of the retaining cylinder on the axial side; and

[0151] The first sealing member is clamped to the radially inner side of the retaining cylinder and between the cylindrical threaded portion and the inner protrusion.

[0152] (A3) The motor according to (A2), wherein,

[0153] The base member has a flange portion that protrudes radially outward from the end of the cylindrical threaded portion on the other side of the axial direction.

[0154] A second sealing member is sandwiched between the flange portion and the axially facing side of the housing.

[0155] (A4) The motor according to any one of (A1) to (A3), wherein,

[0156] The busbar of at least one of the first busbar or the second busbar has a plate-shaped connecting end with the axial direction as the thickness direction.

[0157] A through hole is provided at the connecting end.

[0158] The connector portion of at least one of the first connector portion or the second connector portion has:

[0159] The cylindrical portion is inserted into the through hole; and

[0160] The flange portion protrudes radially outward from the axial end of the cylindrical portion;

[0161] The cylindrical portion has:

[0162] Internal thread portion, provided on the inner circumferential surface; and

[0163] The crimped portion bulges outward radially and clamps the connecting end between itself and the flange portion; and

[0164] At the end of at least one of the first cable or the second cable, a threaded terminal is provided for screwing into the internal thread.

[0165] (A5) The motor according to (A4), wherein,

[0166] A conductive strip or conductive paste is sandwiched between the internal thread and the terminal.

[0167] (A6) The motor according to (A4) or (A5), wherein the motor comprises:

[0168] Multiple busbars are provided for the flow of currents with different phases;

[0169] Multiple connector sections are respectively fixed to different busbars;

[0170] Multiple cables are respectively connected to different connector portions; and

[0171] An insulator having walls located between the connecting ends of the different busbars.

[0172] (A7) The motor according to any one of (A1) to (A6), wherein the motor comprises:

[0173] A shaft, fixed to the rotor, extends axially with the central axis as its center;

[0174] A bearing, located on the opposite side of the rotor axially, supports the shaft for rotation; and

[0175] A bearing cover, fixed to the shaft, extends radially outward from the shaft and covers the bearing from the other side of the axial direction.

[0176] (A8) The motor according to (A7), wherein,

[0177] The housing has a cylindrical bearing cage portion for retaining the bearing.

[0178] On the axial side of the bearing cage portion, there is an annular groove extending circumferentially.

[0179] The bearing cover has:

[0180] The main body of the cover is plate-shaped, with the axial direction as the thickness direction;

[0181] A circular protrusion, protruding axially to one side relative to the main body of the cover, and inserted into the groove; and

[0182] The cylindrical portion protrudes radially outward from the outer side of the annular protrusion relative to the main body of the cover, and surrounds the outer peripheral surface of the bearing cage portion from the radially outer side.

[0183] Moreover, this technology can be configured as follows.

[0184] (B1) A motor, comprising:

[0185] The rotor can rotate around its central axis;

[0186] The stator is opposite the rotor;

[0187] Busbar, connected to the stator;

[0188] The connector part is fixed to the busbar;

[0189] Housing, accommodating the rotor, the stator, and the busbars; and

[0190] A cable is connected to the connector and led out to the outside of the housing;

[0191] The busbar has a plate-shaped connecting end.

[0192] A through hole is provided at the connecting end.

[0193] The connector portion has:

[0194] The cylindrical portion is inserted into the through hole; and

[0195] The flange portion protrudes radially outward from the axial end of the cylindrical portion;

[0196] The cylindrical portion has:

[0197] Internal thread portion, provided on the inner circumferential surface; and

[0198] The crimped portion bulges outward radially;

[0199] The cable end is provided with a threaded terminal for screwing into the internal thread.

[0200] The crimping portion has:

[0201] The annular first crimping portion protrudes radially outward from the outer periphery of the cylindrical portion;

[0202] The annular second crimping portion is axially positioned closer to the connecting end than the first crimping portion, and protrudes radially outward from the outer periphery of the cylindrical portion; and

[0203] The third crimping portion connects the radially outer ends of the first crimping portion and the second crimping portion to each other;

[0204] The connecting end is sandwiched between the second crimping portion and the flange portion.

[0205] (B2) The motor according to (B1), wherein,

[0206] A conductive strip or conductive paste is sandwiched between the internal thread and the terminal.

[0207] (B3) The motor according to (B1) or (B2), wherein the motor comprises:

[0208] Multiple busbars are provided for the flow of currents with different phases;

[0209] Multiple connector sections are respectively fixed to different busbars;

[0210] Multiple cables are respectively connected to different connector portions; and

[0211] An insulator having walls located between the connecting ends of the different busbars.

[0212] (B4) The motor according to any one of (B1) to (B3), wherein,

[0213] The motor includes a first stator located on one axial side of the rotor and a second stator located on the other axial side of the rotor as the stator.

[0214] The motor has a first busbar connected to the first stator and a second busbar connected to the second stator as the busbars.

[0215] The motor has a first connector portion fixed to the first busbar and a second connector portion fixed to the second busbar as the connector portion.

[0216] The motor has a first cable connected to the first connector portion and a second cable connected to the second connector portion as the cable.

[0217] Explanation of reference numerals in the attached figures

[0218] 8: Shaft; 9A, 9B: Bearings; 10: Rotor; 11: Cage; 20: Stator; 20A: First stator; 20B: Second stator; 30b: Protrusion; 31: Busbar; 31a: Connecting end; 31h: Through hole; 31A: First busbar; 31B: Second busbar; 40: Connector part; 40A: First connector part; 40B: Second connector part; 41: Cylindrical part; 41a, 72b: Internal thread part; 41b: Crimping part; 42, 71c: Flange part; 50: Cable; 50A: First cable; 50B: Second cable; 51a, 52a, 71b: External thread part; 51: First terminal (terminal); 52: Second... Terminal; 60: Housing; 60a: First hole; 60b: Second hole; 62g: Groove; 61a: First bearing cage; 62c: Outer circumferential surface; 70: Cable cover; 71: Base member; 71a: Cylindrical threaded part; 72: Cap member; 72a: Nut part; 72c: Retaining cylinder part; 72d: Inner protrusion; 76: First sealing member; 77: Second sealing member; 81, 82: Insulator; 85: Dividing wall; 90: Bearing cover; 91: Cover body; 92: Circular protrusion; 100: Motor; J: Central axis; J1: First axis; J2: Second axis.

Claims

1. A motor, comprising: The rotor can rotate around its central axis; The first stator is axially opposed to the rotor and located on one side of the rotor's axial direction; The second stator is axially opposite to the rotor and located on the other side of the rotor's axial direction; The first busbar is connected to the first stator; The second busbar is connected to the second stator; The first connector portion is fixed to the first busbar; The second connector is fixed to the second busbar; The housing accommodates the rotor, the first stator, the second stator, the first busbar, and the second busbar; A first cable is connected to the first connector and led out to the outside of the housing; as well as The second cable is connected to the second connector and led out to the outside of the housing; The housing is provided with: The first hole extends from the first connector portion toward one axial side; as well as The second hole extends from the second connector portion toward one axial side; The first cable passes through the first hole and is connected to the first connector from the axial side. The second cable passes through the second hole and is connected to the second connector from the axial side. The second connector portion is located radially outside the second stator. The second hole extends from the second connector portion, through the radially outer sides of the second stator and the first stator, to the axial side of the housing.

2. The motor according to claim 1, wherein, The motor includes a cable cover that surrounds at least one of the first cable or the second cable from the radially outer side relative to an axis extending axially. The cable cover has the following features: The base component is fixed to the housing; The cap component is fixed to the base component; as well as A circular first sealing component; The base member has a cylindrical threaded portion that surrounds the cable radially outward from the axis, and has an external threaded portion on its outer circumferential surface. The cap component has: Nut portion, into which the external thread portion is inserted; The retaining cylindrical portion, being cylindrical and surrounding the axis, extends axially from the nut portion; and An annular inner protrusion protrudes radially inward from one end of the retaining cylinder on one side toward the axis; and The first sealing member is clamped to the radially inner side of the retaining cylinder and between the cylindrical threaded portion and the inner protrusion.

3. The motor according to claim 2, wherein, The base member has a flange portion that protrudes radially outward from the end of the cylindrical threaded portion on the other side of the axial direction. A second sealing member is sandwiched between the flange portion and the axially facing side of the housing.

4. The motor according to claim 1, wherein, The busbar of at least one of the first busbar or the second busbar has a plate-shaped connecting end with the axial direction as the thickness direction. A through hole is provided at the connecting end. The connector portion of at least one of the first connector portion or the second connector portion has: The cylindrical portion is inserted into the through hole; and The flange portion protrudes radially outward from the axial end of the cylindrical portion; The cylindrical portion has: The internal thread portion is located on the inner circumferential surface; as well as The crimped portion bulges outward radially and clamps the connecting end between itself and the flange portion; and At the end of at least one of the first cable or the second cable, a threaded terminal is provided for screwing into the internal thread.

5. The motor according to claim 4, wherein, A conductive strip or conductive paste is sandwiched between the internal thread and the terminal.

6. The motor according to claim 4, wherein, The motor has the following features: Multiple busbars are provided for the flow of currents with different phases; Multiple connector sections are respectively fixed to different busbars; Multiple cables are respectively connected to different connector portions; as well as An insulator having walls located between the connecting ends of the different busbars.

7. The motor according to claim 1, wherein, The motor has the following features: A shaft, fixed to the rotor, extends axially with the central axis as its center; A bearing, located on the opposite side of the rotor axially, supports the shaft for rotation; and A bearing cover, fixed to the shaft, extends radially outward from the shaft and covers the bearing from the other side of the axial direction.

8. The motor according to claim 7, wherein, The housing has a cylindrical bearing cage portion for retaining the bearing. On the axial side of the bearing cage portion, there is an annular groove extending circumferentially. The bearing cover has: The main body of the cover is plate-shaped, with the axial direction as the thickness direction; A circular protrusion, protruding axially to one side relative to the main body of the cover, and inserted into the groove; and The cylindrical portion protrudes radially outward from the outer side of the annular protrusion relative to the main body of the cover, and surrounds the outer peripheral surface of the bearing cage portion from the radially outer side.

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