CN111033968A - Motor with a stator having a stator core - Google Patents
Motor with a stator having a stator core Download PDFInfo
- Publication number
- CN111033968A CN111033968A CN201880054198.8A CN201880054198A CN111033968A CN 111033968 A CN111033968 A CN 111033968A CN 201880054198 A CN201880054198 A CN 201880054198A CN 111033968 A CN111033968 A CN 111033968A
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- Prior art keywords
- motor
- capacitor
- housing
- circuit board
- explosion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The motor is provided with: a motor main body having a rotor rotatable about a central axis and a stator radially opposed to the rotor; a circuit board electrically connected to the motor main body; and a capacitor mounted on the circuit board and having an explosion-proof valve, the motor having: a capacitor cover member into which the capacitor is inserted, the capacitor cover member having a component housing portion having a surface facing the explosion-proof valve, the capacitor being housed between the component housing portion and the circuit board; a sealing member having a portion annularly surrounding the explosion-proof valve, the sealing member being in contact with an inner surface of the element housing portion and an outer surface of the capacitor to seal the explosion-proof valve; and a heat dissipation member disposed at least outside the space in which the explosion-proof valve is sealed, in the element housing portion.
Description
Technical Field
The present invention relates to a motor.
Background
In an electromechanical motor including a circuit board for controlling a motor main body, it is known to accommodate elements such as a capacitor, which generate a large amount of heat, in a heat sink to dissipate the heat. Patent document 1 discloses a motor drive device in which a field capacitor (capacitor) is housed in a housing portion of an Electronic Control Unit (ECU) housing.
Documents of the prior art
Patent document
Patent document 1 Japanese patent laid-open publication No. 2013-062959
Disclosure of Invention
Problems to be solved by the invention
The head of the capacitor is provided with an explosion-proof valve. When the overcurrent is assumed to flow through the capacitor, an air layer is preferably provided between the explosion-proof valve and the housing portion. On the other hand, in order to dissipate heat of the capacitor, it is preferable to fill a heat dissipating material such as grease between the capacitor and the housing. However, in the motor drive device described above, when the heat dissipation material is filled between the capacitor and the housing portion, the explosion-proof valve may be embedded in the heat dissipation material, thereby adversely affecting the capacitor.
In view of the above problems, an object of one embodiment of the present invention is to provide a motor in which an air layer is provided in an explosion-proof valve of a capacitor and a heat dissipation material can be filled therein.
Means for solving the problems
One embodiment of the motor of the present invention includes: a motor main body having a rotor rotatable about a central axis and a stator radially opposed to the rotor; a circuit board electrically connected to the motor main body; and a capacitor mounted on the circuit board, having an explosion-proof valve, the motor having: a capacitor cover member into which the capacitor is inserted, the capacitor cover member having a housing portion having a surface facing the explosion-proof valve, the housing portion housing the capacitor between the housing portion and the circuit board; a sealing member having a portion annularly surrounding the explosion-proof valve, the sealing member being in contact with an inner surface of the recess and an outer surface of the capacitor to seal the explosion-proof valve; and a heat dissipation member disposed at least outside the space in which the explosion-proof valve is sealed, in the housing portion.
Effects of the invention
According to one embodiment of the present invention, a motor is provided that promotes heat dissipation from a circuit board around a capacitor in addition to promoting heat dissipation from the capacitor itself.
Drawings
Fig. 1 is a perspective view of a motor according to an embodiment, and is a view showing a state in which a cover is removed upward from a housing.
Fig. 2 is a sectional view of the motor taken along line II-II of fig. 1.
Fig. 3 corresponds to a first modification of the structure of region VII shown in fig. 2.
Fig. 4 corresponds to a second modification of the configuration shown in fig. 3.
Fig. 5 corresponds to a third modification of the configuration shown in fig. 3.
Fig. 6 corresponds to a fourth modification of the configuration shown in fig. 3.
Fig. 7 corresponds to a fifth modification of the configuration shown in fig. 3.
Detailed Description
Hereinafter, a motor 1 according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings below, in order to facilitate understanding of each structure, the actual structure may be different from the scale, the number, or the like of each structure.
In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is a direction parallel to the axial direction of the central axis J described later. The X-axis direction is a direction perpendicular to the Z-axis direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction.
In the following description, the positive side (+ Z side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side) in the Z-axis direction is referred to as "lower side". The upper and lower sides are only names for explanation, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction (Z-axis direction) of the motor main body 2 parallel to the central axis J, which will be described later, is simply referred to as "axial direction", a radial direction around the central axis J is simply referred to as "radial direction", and a circumferential direction around the central axis J, that is, a direction around the central axis J is simply referred to as "circumferential direction". In the following description, the term "plan view" refers to a state viewed from above in the axial direction.
[ Motor ]
Fig. 1 is a perspective view of a motor 1 according to the present embodiment, and is a diagram showing a state in which a cover 40 described later is removed upward from a housing 50. Fig. 2 is a sectional view of the motor 1 taken along line II-II of fig. 1. Fig. 3 is a cross-sectional view of a first modification of the motor 1, and corresponds to an enlarged view of a region VII in fig. 2. In fig. 3, the illustration of the structure other than the lid 40, the circuit board 60, the capacitor 65, the case 50, and the sealing member 94 is omitted as appropriate. Fig. 4 corresponds to a second modification of the motor 1. Fig. 5 corresponds to a third modification of the motor 1. Fig. 6 corresponds to a fourth modification of the motor 1. Fig. 7 corresponds to a fifth modification of the motor 1.
As shown in fig. 2, the motor 1 includes a motor main body 2, an upper bearing (bearing) 7A, a lower bearing 7B, a bearing holder 30, a circuit board 60, a housing 50, an upper heat sink 80, and a lid 40.
[ Motor Main body ]
The motor main body 2 has a rotor 20 and a stator 25. The rotor 20 rotates about a central axis J extending in the vertical direction (axial direction). Rotor 20 includes shaft 21, rotor core 22, and rotor magnet 23.
The shaft 21 extends along the central axis J. The shaft 21 is supported by the upper bearing 7A and the lower bearing 7B so as to be rotatable about the center axis J. Rotor core 22 is fixed to shaft 21. Rotor core 22 circumferentially surrounds shaft 21. Rotor magnet 23 is fixed to rotor core 22. More specifically, the rotor magnet 23 is fixed to an outer surface of the rotor core 22 along the circumferential direction. The rotor core 22 and the rotor magnet 23 rotate together with the shaft 21.
The stator 25 is located radially outside the rotor 20. The stator 25 is opposed to the rotor 20 with a gap therebetween in the radial direction, and surrounds the rotor 20 on the radially outer side. The stator 25 has a stator core 27, an insulator 28, and a coil 29.
The insulating member 28 is made of an insulating material. The insulator 28 covers at least a part of the stator core 27. When the motor 1 is driven, the coil 29 excites the stator core 27. The coil 29 is formed by winding a coil wire (not shown). The coil wire is wound around the teeth of the stator core 27 via an insulator 28. The coil wire is drawn upward at its end and is connected to the circuit board 60 through a through hole provided in the bearing holder 30. When a bus bar is provided between the motor main body 2 and the bearing holder 30, the end of the coil wire is connected to the bus bar, and the bus bar is connected to the circuit board 60. That is, the motor main body 2 includes a rotor 20 rotatable about the center axis J and a stator 25 radially opposed to the rotor 20.
[ Upper and lower side bearings ]
The upper bearing 7A rotatably supports the upper end portion of the shaft 21. The upper bearing 7A is located on the upper side of the stator 25. The upper bearing 7A is supported by a bearing holder 30.
The lower bearing 7B rotatably supports the lower end portion of the shaft 21. The lower bearing 7B is located on the lower side of the stator 25. The lower bearing 7B is supported by the lower bearing holding portion 54c of the housing 50.
In the present embodiment, the upper bearing 7A and the lower bearing 7B are ball bearings. However, the types of the upper bearing 7A and the lower bearing 7B are not particularly limited, and may be other types of bearings.
[ outer case ]
The housing 50 is located on the underside of the circuit board 60. The housing 50 of the present embodiment directly contacts the circuit board 60 and functions as a heat sink for cooling the circuit board 60. The housing 50 may be in contact with the circuit board 60 indirectly, or may be in thermal contact with the circuit board 60 to cool the circuit board 60. More specifically, the housing 50 may be in contact with the circuit board 60 via a heat dissipating material such as heat dissipating grease.
The housing 50 has a heat sink 53, a motor body housing 54, and an element housing 55. The housing 50 absorbs heat mainly generated by the circuit board 60 in the heat sink portion 53. The housing 50 houses the motor main body 2 in the motor main body housing portion 54. In addition, the case 50 houses a capacitor 65 provided on the circuit board 60 in the element housing portion 55. That is, the capacitor 65 is inserted into a member (capacitor cover member) extending radially outward from the motor main body housing portion 54 and including the element housing portion 55 in the housing 50. In other words, the capacitor cover member is a part of the housing 50. The housing 50 has an element housing portion 55 facing an explosion-proof valve 90 described later, and the capacitor 65 is housed between the element housing portion 55 and the circuit board 60. The element housing portion 55 has a concave shape. That is, the housing 50 has an element housing portion 55.
The housing 50 is constructed as a single component. That is, the case 50 functions as a heat sink, a function of housing the motor main body 2, and a function of housing the capacitor 65 in a single component. The housing 50 may be a separate member to which at least one of the heat sink 53, the motor body housing 54, and the element housing 55 is fastened by fastening means such as screws. The heat sink 53 and the motor body housing 54 may be separate members, and the heat sink 53 may be a part of the bearing holder 30. However, since the housing 50 is a single component, heat of the circuit board 60 absorbed in the heat sink 53 can be efficiently dissipated not only in the heat sink 53 but also in the motor body housing 54 and the element housing 55. That is, according to the present embodiment, since the housing 50 is configured as a single member, the heat radiation effect of the housing 50 is improved. In addition, according to the present embodiment, since the housing 50 is formed of a single member, the assembly process of the motor 1 can be simplified.
The housing 50 is made of a metal material having high heat dissipation characteristics and sufficient rigidity. For example, the housing 50 is made of aluminum alloy. In this case, the housing 50 is manufactured by forming the housing into a substantial shape by die casting or the like, and then cutting a surface requiring precision.
The heat sink portion 53 extends in a direction perpendicular to the center axis J. The heat sink portion 53 is located on the lower side of the circuit board 60. The heat sink portion 53 extends along the circuit board 60 on the lower side of the circuit board 60. The heat sink 53 is located between the motor body housing 54 and the element housing 55 in a plan view, and connects the motor body housing 54 and the element housing 55. The heat sink 53 has an upper surface 53a facing upward and a lower surface 53b facing downward.
A heat radiation surface 53c is provided on the upper surface 53a of the heat sink 53, and the heat radiation surface 53c is in direct contact with the lower surface 61c of the substrate main body 61 of the circuit board 60 or indirectly via a member such as a heat sink. That is, the heat sink 53 has a heat radiation surface 53c that contacts the substrate main body 61. The heat sink 53 absorbs heat from the circuit board 60 on the heat radiation surface 53c, and cools the circuit board 60.
As will be described later, the circuit board 60 has a plurality of field effect transistors 66 mounted on the upper surface 61d of the substrate main body 61. The field effect transistor 66 is also referred to as fet (field effect transistor). The field effect transistor 66 is a heat generating element that easily generates heat on the circuit board 60. At least a part of the field effect transistor 66 overlaps with the heat dissipation surface 53c when viewed from the axial direction. This enables heat generated by the field effect transistor 66 to efficiently move to the heat sink 53 on the heat radiating surface 53 c. This can suppress an excessive temperature rise of the field effect transistor 66, and improve the reliability of the operation of the field effect transistor 66.
In the present embodiment, a case where the heat generating element overlapping the heat radiating surface 53c in the axial direction is the field effect transistor 66 is exemplified. However, the heat generating element overlapping the heat radiating surface 53c may be another mounting member (element). In the present specification, the heat generating element refers to an element that generates heat and becomes high temperature during operation among the mounted components. As the heat generating element, a driver integrated circuit for driving a field effect transistor and a power supply integrated circuit are exemplified in addition to a field effect transistor and a capacitor, but the type is not limited as long as the element becomes a high temperature.
The heat sink portion 53 is provided with ribs 56. The rib 56 is located immediately below the heat dissipation surface 53c that is in contact with the substrate main body 61. That is, at least a part of the rib 56 overlaps the heat radiation surface 53c when viewed from the axial direction.
The motor main body housing portion 54 has a cylindrical shape that is open to the upper side (+ Z side). The motor body housing portion 54 extends downward from the heat sink portion 53. The motor body housing portion 54 houses the rotor 20 and the stator 25. The motor main body housing portion 54 has a cylindrical portion 54a, a bottom portion 54b, and a lower bearing holding portion 54 c. The motor main body housing portion 54 may be a cylindrical member without the bottom portion 54 b. In this case, a bearing holder for holding a bearing is separately attached to the opening on the lower side of the motor body housing portion 54.
The cylindrical portion 54a surrounds the stator 25 from the radially outer side. In the present embodiment, the cylindrical portion 54a is cylindrical. The stator core 27 and the bearing holder 30 are fixed to the inner peripheral surface of the cylindrical portion 54 a. A radiator portion 53 is connected to an upper end portion of the cylindrical portion 54a and to an outer peripheral surface of the cylindrical portion 54 a.
The bottom portion 54b is located at the lower end of the cylindrical portion 54 a. The bottom portion 54b is located on the lower side of the stator 25. The lower bearing holding portion 54c is located at the center of the bottom portion 54b in plan view. The lower bearing holding portion 54c holds the lower bearing 7B. A hole 54d penetrating in the axial direction is provided at the center of the lower bearing holder 54c in a plan view. The lower end of the shaft 21 is inserted into the hole 54 d.
The element housing portion 55 is open to the upper side (+ Z side). The element housing portion 55 extends downward from the heat sink portion 53. As shown in fig. 1, the element housing portion 55 of the present embodiment houses three capacitors 65. The three capacitors 65 are aligned in one direction (Y-axis direction in the present embodiment) perpendicular to the central axis J. In a plan view, the element housing portion 55 has the direction in which the three capacitors 65 are arranged (i.e., the direction in which the 2 nd rib 56b extends) as the longitudinal direction. The dimension S1 in the longitudinal direction of the element housing portion 55 is smaller than the diameter D of the motor body housing portion 54. That is, even when the plurality of capacitors 65 are arranged in a row in one direction, the dimension S1 in the longitudinal direction of the element housing portion 55 does not exceed the motor main body housing portion 54. Therefore, the size of the motor 1 can be suppressed in the direction perpendicular to the central axis J.
As shown in fig. 2, the capacitor 65 has a top surface 65b facing downward and a side surface 65a facing in a direction perpendicular to the axial direction. The element housing portion 55 includes: a sidewall portion 55a surrounding a side surface 65a of the capacitor 65; and a housing bottom portion 55b located below the capacitor 65 and axially opposed to the top surface 65b of the capacitor 65.
According to the present embodiment, the housing 50 has the element housing portion 55 housing the capacitor 65. The capacitor 65 is a heat generating element that easily generates a large amount of heat in the circuit board 60 as compared with the field effect transistor 66 or other electronic components. Therefore, heat generated in capacitor 65 can be efficiently absorbed in element housing portion 55. As will be described later, a heat dissipating material such as heat dissipating grease is housed between the side wall portion 55a of the element housing portion 55 and the side surface 65a of the capacitor 65. This enables heat to be efficiently transferred from side surface 65a of capacitor 65 toward element housing portion 55, thereby improving the reliability of the operation of capacitor 65.
The capacitor 65 has an explosion-proof valve 90 at a front end portion 65t in a direction perpendicular to the planar direction (i.e., the axial direction of the motor main body 2). The diameter of the outer side of the explosion-proof valve 90 is smaller than the diameter of the front end portion 65t of the capacitor 65. Heat dissipation material 70 is disposed between housing bottom portion 55b of element housing portion 55 and top surface 65b of capacitor 65. The heat dissipating material 70 is disposed so as to avoid at least the explosion-proof valve 90.
In the present embodiment, a sealing member 94 is provided between the element housing portion 55 and the capacitor 65. The sealing member 94 has a portion annularly surrounding the explosion-proof valve 90, and seals the explosion-proof valve 90 by contacting the inner surface 59 of the element housing portion 55 and the outer surface 65u of the capacitor 65. The sealing member 94 is an insulating member, and can prevent the circuit board 60 and the electronic components mounted on the circuit board 60 from being adversely affected even if the electrolyte leaks from the explosion-proof valve 90. Further, since the sealing member 94 is positioned between the top surface 65b of the capacitor 65 and the bottom surface 59b of the inner surface 59 of the element housing portion 55, the filling amount of the heat dissipating material 70 is increased, thereby improving the heat dissipating efficiency.
The heat dissipation material 70 is filled in the element housing portion 55 at a position outside the sealing member 94 (i.e., on the side close to the circuit board 60) in the space between the element housing portion 55 and the capacitor 65. That is, the heat radiation member 70 is disposed at least outside the space in which the explosion-proof valve 90 is sealed in the element housing portion 55. By providing the sealing member 94 and the heat radiating member 70, the explosion-proof valve 90 is separated from the heat radiating member 70 via the sealing member 94. Therefore, the heat radiating material 70 is prevented from contacting the explosion-proof valve 90 and an air layer a is provided in the explosion-proof valve 90. Further, since the heat dissipation material 70 can be filled between the element housing portion 55 and the capacitor 65, heat can be efficiently dissipated by the heat dissipation material 70.
In the present embodiment, the motor body housing portion 54 and the element housing portion 55 each extend downward from the heat sink portion 53. That is, the motor body housing portion 54 and the element housing portion 55 are separated from each other when viewed from the axial direction. According to the present embodiment, since the motor body housing portion 54 and the element housing portion 55 extend from the heat sink portion 53, respectively, the surface area of the outer peripheral surface of the housing 50 is increased, and the heat radiation effect of the housing 50 can be improved. As described above, the motor main body housing portion 54 and the element housing portion 55 may be different members fixed to each other via the heat sink portion 53.
The housing 50 has an upper surface 50a facing the upper side. The upper surface 50a is provided across the motor body housing portion 54, the element housing portion 55, and the heat sink portion 53 of the housing 50. The upper surface 50a is opposed to the lid 40. The upper surface 50a is provided with a 2 nd groove portion 52 extending along an outer edge of the upper surface 50 a. The 2 nd groove portion 52 is recessed downward with respect to the upper surface 50 a. The 2 nd groove portion 52 extends with a uniform width and a uniform depth in a plane perpendicular to the center axis J. The 2 nd groove portion 52 accommodates the 2 nd projecting portion 42 of the cover portion 40 described later.
[ bearing retainer ]
The bearing holder 30 is located on the upper side (+ Z side) of the stator 25. The bearing holder 30 supports the upper bearing 7A. The bearing holder 30 has a circular shape in plan view, for example, concentric with the central axis J. The bearing holder 30 is positioned in the opening 54e on the upper side of the motor body housing 54, and is fixed to the inner peripheral surface of the motor body housing 54.
The bearing holder 30 includes: a circular plate-shaped holder body portion 31 in a plan view; an upper bearing holding portion 32 located radially inward of the holder body portion 31; and a holder fixing portion 33 located radially outward of the holder body portion 31.
The upper bearing holding portion 32 holds the upper bearing 7A. The upper bearing holding portion 32 is located at the center of the bearing holder 30 in a plan view. A hole 32a penetrating in the axial direction is provided at the center of the upper bearing holder 32 in a plan view. The upper end of the shaft 21 is inserted into the hole 32 a. The holder fixing portion 33 has a cylindrical shape protruding in the vertical direction from the radial outer edge of the holder body portion 31. The outer peripheral surface of the holder fixing portion 33 is radially opposed to the inner peripheral surface of the motor body housing portion 54. The holder fixing portion 33 is fitted and fixed to the inner peripheral surface of the motor body housing portion 54.
At least a part of the bearing holder 30 overlaps with the heat sink portion 53 of the housing 50 in the axial direction. Therefore, the space above the bearing holder 30 can be sufficiently enlarged. As a result, the degree of freedom in the arrangement of the circuit board 60 positioned above the bearing holder 30 and the arrangement of the mounting components of the circuit board 60 can be improved.
[ Circuit Board ]
The circuit board 60 is located on the upper side of the motor main body 2 and the bearing holder 30. The circuit board 60 extends in a direction perpendicular to the central axis J (i.e., a direction perpendicular to the up-down direction). Coil wires extending from the coils 29 of the stator 25 are connected to the circuit board 60. That is, the circuit board 60 is electrically connected to the motor main body 2. The circuit board 60 controls the rotation of the rotor 20 by causing a current to flow in the coil 29.
The circuit board 60 has a substrate body 61, a plurality of capacitors 65, and a plurality of field effect transistors 66. In the present embodiment, three capacitors 65 are provided. In addition, the substrate main body 61 includes electronic components (not shown) for controlling the rotation of the rotor 20.
The substrate main body 61 is disposed so as to be perpendicular to the axial direction (i.e., the vertical direction). The substrate main body 61 has an upper surface 61d facing upward and a lower surface 61c facing downward. Further, the substrate main body 61 includes: a motor body overlapping portion 61A that overlaps the motor body 2 when viewed in the vertical direction; and a protruding portion 61B located outside the motor main body 2 when viewed from the up-down direction.
The capacitor 65 is mounted on the lower surface 61c of the substrate body 61. The capacitor 65 has a cylindrical shape extending in the axial direction. The capacitor 65 has: a top surface 65b located on the opposite side from the substrate main body 61 and facing the lower side; and a side surface 65a facing in a direction perpendicular to the axial direction (vertical direction). Among the mounting components of the circuit board 60, the capacitor 65 has the largest dimension in the axial direction (vertical direction). The field effect transistor 66 is mounted on the upper surface 61d of the substrate main body 61. The field effect transistor 66 has a rectangular shape in plan view. Further, electronic components such as a rotation sensor and a choke coil are mounted on one or both of the upper surface 61d and the lower surface 61c of the substrate main body 61 in addition to the capacitor 65 and the field effect transistor 66.
The capacitor 65 and the field effect transistor 66 as the heat generating element are mounted on the extension portion 61B of the substrate main body 61. An upper heat sink 80 described later is located on the upper side of the protruding portion 61B. The upper heat sink 80 is in direct or indirect contact with the protruding portion 61B and the field effect transistor 66 mounted on the upper surface 61d of the protruding portion 61B, and cools them. In addition, the heat sink portion 53 and the element housing portion 55 of the housing 50 are located below the protruding portion 61B. The heat sink 53 and the element housing 55 are in direct or indirect contact with the extension 61B and the capacitor 65 attached to the lower surface 61c of the extension 61B, and cool them. That is, according to the present embodiment, the extension portion 61B on which the heating element (the capacitor 65 and the field effect transistor 66) is mounted is sandwiched between the upper heat sink 80 and the case 50 from the up-down direction. This enables the upper heat sink 80 and the case 50 to more effectively cool the heating elements 65 and 66 attached to the extension portion 61B. Further, according to the present embodiment, by disposing the heater elements 65 and 66 to be cooled in the extension portion 61B of the substrate main body 61, the structure required for cooling the heater elements 65 and 66 can be disposed offset from the motor main body 2 in a plan view. Therefore, the axial dimension (vertical dimension) of the motor 1 can be reduced.
[ Upper radiator ]
The upper heat sink 80 is located on the upper side of the circuit board 60. The upper heat sink 80 covers a part of the circuit board 60 from the upper side. The upper heat sink 80 of the present embodiment directly or indirectly contacts the circuit board 60, and functions as an upper heat sink for cooling the circuit board 60. The upper heat sink 80 may be in direct contact with the circuit board 60 or may be in indirect contact therewith, as long as it is in thermal contact with the circuit board 60 and cools the circuit board 60. More specifically, the upper heat sink 80 may be in contact with the circuit board 60 via a heat dissipating material such as heat dissipating grease.
The upper heat sink 80 has a heat absorbing portion 85 and fins 89a on an upper surface 85a of the heat absorbing portion 85. The upper heat sink 80 is made of a metal material (e.g., an aluminum alloy or a copper alloy) having high heat dissipation characteristics.
As shown in fig. 3, the heat absorbing portion 85 has an upper surface 85a facing upward and a lower surface 85b facing downward. In addition, the heat absorbing portion 85 is provided with a pair of screw insertion holes. The screw insertion hole penetrates the heat absorbing portion 85 in the axial direction. Fixing screws are inserted into the pair of screw insertion holes, respectively. The fixing screw is screwed to the heat sink portion 53 of the housing 50. Thereby, the lower surface 85b of the heat absorbing portion 85 abuts against the upper surface 53a of the heat sink portion 53, and the upper heat sink 80 is fixed to the housing 50.
According to the present embodiment, the upper heat sink 80 is directly in contact with the case 50 and fixed to each other. The upper heat sink 80 and the housing 50 respectively absorb heat from the circuit board 60. By bringing the upper heat sink 80 and the housing 50 into contact and fixing with each other, thermal movement is generated between the upper heat sink 80 and the housing 50. Therefore, when either one of the upper heat sink 80 and the housing 50 becomes a high temperature, the heat can be transferred to the other side and also be radiated from the other side. This improves the heat dissipation efficiency, and as a result, the cooling effect of the circuit board 60 can be improved.
As will be described later, the lid 40 is provided above the upper heat sink 80. The lid 40 is provided with an opening 49 penetrating in the vertical direction. The upper heat sink 80 has an exposed portion 89 exposed from the opening portion 49 of the cover 40. The exposed portion 89 is located on the upper surface 85a of the heat sink 85.
According to the present embodiment, the upper heat sink 80 has the exposed portion 89, and thus the upper heat sink 80 can efficiently dissipate heat absorbed from the circuit board 60 to the outside of the motor 1 from the exposed portion 89. This can improve the cooling efficiency of the circuit board 60 by the upper heat sink 80.
The exposed portion 89 of the upper heat sink 80 is located directly above the capacitor 65 and the field effect transistor 66 as the heat generating element. That is, when viewed from the axial direction (vertical direction), the exposed portion 89 of the upper heat sink 80 overlaps at least a part of the field effect transistor 66. This allows heat transferred from the circuit board 60 to the upper heat sink 80 to be efficiently dissipated in the exposed portion 89. The heating element overlapping the exposed portion 89 when viewed in the axial direction may be a heating element other than the capacitor 65 and the field effect transistor 66 (for example, a driver integrated circuit for driving a field effect transistor, an integrated circuit for a power supply).
As shown in fig. 1, the fins 89a are located at the exposed portion 89 of the upper heat sink 80. The fins 89a protrude upward from the upper surface 85a of the heat absorbing portion 85. As shown in fig. 2, the fin 89a penetrates the opening 49 in the exposed portion 89.
The upper heat sink 80 is provided with a plurality of fins 89a (see fig. 1). The plurality of fins 89a extend in one direction perpendicular to the up-down direction. In the present embodiment, the fins 89a extend in the X-axis direction. According to the present embodiment, by providing the fins 89a in the exposed portion 89, the surface area of the exposed portion 89 can be increased, and the heat radiation efficiency of the upper heat sink 80 in the exposed portion 89 can be improved. Further, according to the present embodiment, since the plurality of fins 89a extend in one direction, when the motor 1 is disposed in the gas flowing in one direction, the fins 89a are disposed so as to extend in the flowing direction of the gas, and thus the heat radiation efficiency by the fins 89a can be improved. In the present embodiment, the case where the upper heat sink 80 has the fins 89a is exemplified. However, if the upper heat sink 80 has the exposed portion 89, a certain effect of improving the heat radiation efficiency can be obtained even if the upper heat sink 80 does not have the fins 89 a.
The heat sink 85 has a top surface 85a provided with a 1 st groove portion 81, and the 1 st groove portion 81 surrounds the exposed portion 89 when viewed in the axial direction (vertical direction). The 1 st groove portion 81 extends with a uniform width and a uniform depth in a plane perpendicular to the center axis J. The 1 st groove portion 81 is recessed downward with respect to the upper surface 85 a. The 1 st projecting portion 41 of the cover portion 40 described later is housed in the 1 st groove portion 81.
[ Cap portion ]
As shown in fig. 2, the cover 40 is located on the upper side of the housing 50, the circuit board 60, and the upper heat sink 80. The cover 40 covers the upper surface 50a of the housing 50. The cover 40 covers the circuit board 60 from above to protect the circuit board 60. The cover 40 covers the opening of the motor main body housing 54 of the housing 50, and suppresses entry of contaminants into the rotating portion of the motor main body 2 and the like.
As shown in fig. 1, the cover 40 includes: a flat portion 45; an outer edge portion 46 located on the outer edge of the flat portion 45 and protruding downward with respect to the flat portion 45; and a connector portion 47 extending upward from the flat portion 45.
The connector portion 47 has a cylindrical shape extending upward from the flat portion 45. A connection terminal (not shown) extending upward from the circuit board 60 is provided inside the connector portion 47. The connection terminals are connected to an external device (not shown) that supplies power to the circuit board 60.
As shown in fig. 2, the flat portion 45 extends in a direction perpendicular to the axial direction (vertical direction). That is, the flat portion 45 extends along the circuit board 60. The flat portion 45 has an upper surface 45a facing upward and a lower surface 45b facing downward.
The flat portion 45 is provided with an opening 49. The opening 49 has a rectangular shape when viewed from the axial direction. The fins 89a of the upper heat sink 80 are inserted into the openings 49. The upper end of the fin 89a is located above the upper surface 45a of the flat portion 45.
The lower surface 45b of the flat portion 45 is axially separated from the heat absorbing portion 85. Therefore, the flat portion 45 does not contact the upper heat sink 80. The lower surface 45b of the flat portion 45 is provided with a 1 st projecting portion 41 projecting downward.
The 1 st projection 41 surrounds the opening 49 when viewed from the axial direction. The 1 st projection 41 extends with the same width and the same height in a plane perpendicular to the central axis J. The 1 st projection 41 is received in the 1 st groove 81, and the 1 st groove 81 is provided in the upper heat sink 80. The upper heat sink 80 is provided with an exposed portion 89 exposed from the opening portion 49. Therefore, when viewed from the axial direction (vertical direction), exposed portion 89 is surrounded by 1 st protruding portion 41 and 1 st groove portion 81. A gap is provided between the inner wall surface of the 1 st groove portion 81 and the 1 st convex portion 41. The 1 st groove portion 81 is filled with an adhesive B.
Next, a modified example of the present embodiment will be described in terms of providing an air layer in the explosion-proof valve of the capacitor and enabling filling with a heat radiating material. In order to easily understand the preferred arrangement of the sealing member 94 and the heat dissipation member 70, the shape of the element housing portion 55 or the lid portion 40 is partially simplified and illustrated in fig. 3 to 7.
First modification
As shown in fig. 3, the element housing portion 55 may have a groove portion 96 for holding the sealing member 94. In the present modification, the groove portion 96 is recessed downward from the bottom surface 59b of the inner surface 59 of the element housing portion 55. Since the seal member 94 is fitted into the groove portion 96, the seal member 94 can be positioned. Further, when the heat dissipation material 70 is filled, the positional displacement of the sealing member 94 can be suppressed.
Second modification example
As shown in fig. 4, the sealing member 94 may be located between the side surface 65a of the capacitor 65 and the inner peripheral surface 59a of the inner surface 59 of the element housing portion 55. The sealing member 94 in contact with the side surface 65a of the capacitor 65 may be a gasket or the like. Since the sealing member 94 is positioned between the side surface 65a and the inner peripheral surface 59a, the air layer a is increased, and the electrolyte can be prevented from leaking outward from the sealing member 94 even if the discharge amount of the electrolyte discharged from the explosion-proof valve 90 is large. Further, as in the first modification, the sealing member 94 may be fitted into a groove portion 96 recessed from the inner peripheral surface 59a in a direction away from the capacitor 96.
Third modification example
As shown in fig. 5, the capacitor 65 may be mounted on the upper surface 61d of the substrate main body 61 of the circuit board 60. The motor 1 may have a housing 50 and a lid 40 fixed to the housing 50 from above. At this time, the housing 50 accommodates the motor main body 2 not shown. The cover 40 covers at least a portion of the circuit board 60. The capacitor cover member 97 may be a part of the lid 40. Further, the cover 40 may have a cylindrical portion 48, and the cylindrical portion 48 may extend downward toward the circuit board 60 from a surface 40d facing the upper surface 61d of the substrate main body 61 of the circuit board 60. The cylindrical portion 48 houses the capacitor 65 in the same manner as the element housing portion 55 described above.
In the present modification, the sealing member 94 is provided between the upper surface 40d of the lid portion 40 and the top surface 65b of the capacitor 65. The heat dissipation material 70 may be filled in a space surrounded by the tube portion 48, the capacitor 65, the sealing member 94, and the circuit board 60. According to this modification, as in the embodiment described above, the filling amount of the heat dissipation material 70 can be increased, and the heat dissipation efficiency can be improved.
Fourth modification
As shown in fig. 6, in the configuration shown in fig. 5, the sealing member 94 may be positioned between the side surface 65a of the capacitor 65 and the inner circumferential surface 48a of the tube 48. The sealing member 94 may be fitted into a groove 96 recessed from the inner peripheral surface 48a in a direction away from the capacitor 96. According to this modification, as in the second modification, the air layer a is increased, and thus even if the discharge amount of the electrolyte discharged from the explosion-proof valve 90 is large, the electrolyte can be prevented from leaking to the outside from the sealing member 94.
Fifth modification example
In the embodiment and the first to fourth modifications described above, the rising direction of the capacitor 65 is perpendicular to the planar direction, but the rising direction of the capacitor 65 is not particularly limited. For example, as shown in fig. 7, the capacitor 65 may be disposed parallel to the lower surface 61c of the substrate main body 61 of the circuit board 60, and a part of the side surface 65a may abut against the lower surface 61 c. At this time, the capacitor 65 and the circuit board 60 are connected by a connection wire 99 such as a lead wire. The sealing member 94 seals the explosion-proof valve 90 by contacting the inner peripheral surface 59a of the inner surface 59 of the element housing portion 55 facing the top surface 65b of the capacitor 65 and the top surface 65b of the capacitor 65. The heat dissipation material 70 is filled between the side surface 65a of the capacitor 65 that is not in contact with the circuit board 60 and the inner surface 59 of the element housing portion 55. According to the present modification, the explosion-proof valve 90 can be provided with the air layer a while preventing the heat radiation member 70 from coming into contact with the explosion-proof valve 90. Further, the heat dissipation material 70 can be filled between the element housing portion 55 and the capacitor 65, and heat can be efficiently dissipated by the heat dissipation material 70. In fig. 7, the lid 40 is not shown.
Next, a process of assembling the lid 40 in the manufacturing process of the motor 1 will be described. In the present embodiment, the assembly of the lid 40 to the motor 1 is performed at the end of the assembly process. First, the interiors of the 1 st groove portion 81 of the upper heat sink 80 and the 2 nd groove portion 52 of the housing 50 are filled with uncured adhesive B. Next, the lid portion 40 is brought close to the upper heat sink 80 and the housing 50 fixed to the upper heat sink 80 from the upper side, the 1 st protruding portion 41 is inserted into the 1 st groove portion 81, and the 2 nd protruding portion 42 is inserted into the 2 nd groove portion 52. Subsequently, the adhesive B is cured. The lid 40 is assembled to the motor 1 through the above steps.
According to the present embodiment, the 1 st projecting portion 41 and the 2 nd projecting portion 42 project in the same direction, and the 1 st groove portion 81 and the 2 nd groove portion 52 open in the same direction. In addition, the 1 st groove portion 81 and the 2 nd groove portion 52 are filled with uncured adhesive B. Since the 1 st groove portion 81 and the 2 nd groove portion 52 are opened in the same direction, the 1 st groove portion 81 and the 2 nd groove portion 52 can be simultaneously filled with the uncured adhesive B. In addition, the following steps can be adopted: after the uncured adhesive B is filled in the 1 st groove part 81 and the 2 nd groove part 52, the lid part 40 is lowered, and the 1 st protruding part 41 and the 2 nd protruding part 42 are accommodated in the 1 st groove part 81 and the 2 nd groove part 52, respectively. This can simplify the assembly process of the lid 40.
As shown in fig. 1, the housing 50 and the cover 40 are fixed to each other by the snap-fit portion 6. The motor 1 is provided with a plurality of snap-fit portions 6 in the circumferential direction.
The snap-fit portion 6 is constituted by a hook portion 43 provided to the cover portion 40 and a claw portion 58 provided to the housing 50. The hook portion 43 of the lid portion 40 extends downward in a U shape from the outer edge portion 46. The claw portion 58 protrudes outward in the horizontal direction from the outer side surface of the housing 50. In the process of assembling the lid portion 40, the worker brings the lid portion 40 close to the housing 50 in the axial direction, and thereby the claw portions 58 are fitted to the hook portions 43, and the lid portion 40 is fixed to the housing 50. In the present embodiment, the snap-fit portion 6 is provided to hold the lid portion 40 during a period from when the lid portion 40 is assembled to the housing 50 until the adhesive B is cured. In addition, when the adhesive B is not used for fixing the lid portion 40, the lid portion 40 is fixed to the housing 50 constantly by the fixing function of the snap-fit portion 6.
While the embodiment and the modification of the present invention have been described above, the configurations and combinations thereof in the embodiment and the modification are merely examples, and addition, omission, replacement, and other modifications of the configurations can be made within the scope not departing from the gist of the present invention. The present invention is not limited to the embodiments.
For example, in the above embodiment, the rotor 20 is an inner rotor disposed radially inside the coil 29. However, the arrangement of the rotor 20 is not limited thereto. For example, the rotor 20 may be an outer rotor disposed radially outside the coil 29. The capacitor cover member may be a part of a bearing holder, for example.
Description of the reference symbols
1: a motor; 2: a motor main body; 6: a snap-fit portion; 7A: an upper side bearing (bearing); 20: a rotor; 21: a shaft; 25: a stator; 30: a bearing retainer; 40: a cover portion; 41: a first convex portion; 42: a second convex portion; 49: an opening part; 50: a housing; 52: a second groove portion; 53: a radiator part; 53 c: a heat dissipating surface; 54: a motor main body housing section; 54e, and (b) 54 e: an opening; 55: an element housing section; 56: a rib; 60: a circuit board; 61: a substrate main body; 61A: a motor main body overlapping portion; 61B: a protruding portion; 65: a capacitor; 80: an upper heat sink; 81: a first groove portion; 89: an exposed portion; 89 a: a fin; 90: an explosion-proof valve; 94: a sealing member; a: a space; b: an adhesive; d: a diameter; j: a central axis; s1: and (4) size.
Claims (9)
1. A motor is provided with:
a motor main body having a rotor rotatable about a central axis and a stator radially opposed to the rotor;
a circuit board electrically connected to the motor main body; and
a capacitor mounted to the circuit board and having an explosion-proof valve,
the motor has:
a capacitor cover member into which the capacitor is inserted, the capacitor cover member having an element housing portion having a surface facing the explosion-proof valve, the capacitor being housed between the element housing portion and the circuit board;
a sealing member having a portion annularly surrounding the explosion-proof valve, the sealing member being in contact with an inner surface of the element housing portion and an outer surface of the capacitor to seal the explosion-proof valve; and
and a heat dissipating material disposed at least outside the space in which the explosion-proof valve is sealed in the element housing portion.
2. The motor of claim 1,
the element receiving portion is of a concave shape,
the sealing member is an insulating member and is located between the capacitor and the bottom surface of the element housing portion.
3. The motor of claim 1,
the element receiving portion is of a concave shape,
the sealing member is an insulating member and is located between the capacitor and the inner peripheral surface of the element housing portion.
4. The motor according to any one of claims 1 to 3,
the motor has a housing for receiving the motor main body,
the capacitor case component is part of the housing.
5. The motor of claim 4,
the housing has a component receiving portion that receives a component,
the element receiving portion is concave in shape.
6. The motor according to any one of claims 1 to 3,
the motor has:
a housing that houses the motor main body; and
a cover portion fixed to the housing, covering at least a part of the circuit board,
the capacitor cover member is a part of the cover portion.
7. The motor of claim 6,
the cover portion has a cylindrical portion extending from a surface facing the circuit board toward the circuit board,
the cylindrical portion is a component housing portion.
8. The motor according to any one of claims 1 to 3,
the motor has a bearing holder holding a bearing that supports the rotor,
the capacitor case component is a part of the bearing holder.
9. The motor according to any one of claims 1 to 8,
the element housing portion has a groove portion that holds the sealing member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017192189 | 2017-09-29 | ||
| JP2017-192189 | 2017-09-29 | ||
| PCT/JP2018/028637 WO2019064897A1 (en) | 2017-09-29 | 2018-07-31 | Motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111033968A true CN111033968A (en) | 2020-04-17 |
Family
ID=65903371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880054198.8A Pending CN111033968A (en) | 2017-09-29 | 2018-07-31 | Motor with a stator having a stator core |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2019064897A1 (en) |
| CN (1) | CN111033968A (en) |
| WO (1) | WO2019064897A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7292956B2 (en) * | 2019-04-26 | 2023-06-19 | 株式会社シマノ | Drive unit for human powered vehicle |
| JP2021035165A (en) * | 2019-08-23 | 2021-03-01 | 日本電産トーソク株式会社 | Electric actuator |
| EP4138280A4 (en) * | 2020-04-16 | 2023-05-31 | Mitsubishi Electric Corporation | Rotary electric machine |
| CN114876827A (en) | 2021-02-05 | 2022-08-09 | 创科无线普通合伙 | Hair drier |
| JPWO2022230007A1 (en) * | 2021-04-26 | 2022-11-03 |
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|---|---|---|---|---|
| JPH0786103A (en) * | 1993-09-17 | 1995-03-31 | Oki Electric Ind Co Ltd | Cover structure for electrolytic capacitor |
| JPH10257718A (en) * | 1997-03-13 | 1998-09-25 | Toshiba Corp | Motor with inverter |
| JP2007234735A (en) * | 2006-02-28 | 2007-09-13 | Shindengen Electric Mfg Co Ltd | Electrolytic capacitor device |
| JP2011041359A (en) * | 2009-08-07 | 2011-02-24 | Denso Corp | Motor with built-in drive circuit |
| CN103534908A (en) * | 2011-05-20 | 2014-01-22 | 三菱电机株式会社 | Motor driving apparatus for electric-powered power steering apparatus |
| JP2014050229A (en) * | 2012-08-31 | 2014-03-17 | Denso Corp | Rotary electric machine for vehicle |
| CN103748644A (en) * | 2011-08-19 | 2014-04-23 | 罗伯特·博世有限公司 | Capacitor having a heat sink |
| CN104604115A (en) * | 2013-05-21 | 2015-05-06 | 日立汽车系统株式会社 | Power conversion apparatus |
| CN206148285U (en) * | 2016-11-09 | 2017-05-03 | 南通亚旺电子制品有限公司 | Anti -explosion capacitor convenient to dismouting is changed |
-
2018
- 2018-07-31 JP JP2019544353A patent/JPWO2019064897A1/en active Pending
- 2018-07-31 CN CN201880054198.8A patent/CN111033968A/en active Pending
- 2018-07-31 WO PCT/JP2018/028637 patent/WO2019064897A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0786103A (en) * | 1993-09-17 | 1995-03-31 | Oki Electric Ind Co Ltd | Cover structure for electrolytic capacitor |
| JPH10257718A (en) * | 1997-03-13 | 1998-09-25 | Toshiba Corp | Motor with inverter |
| JP2007234735A (en) * | 2006-02-28 | 2007-09-13 | Shindengen Electric Mfg Co Ltd | Electrolytic capacitor device |
| JP2011041359A (en) * | 2009-08-07 | 2011-02-24 | Denso Corp | Motor with built-in drive circuit |
| CN103534908A (en) * | 2011-05-20 | 2014-01-22 | 三菱电机株式会社 | Motor driving apparatus for electric-powered power steering apparatus |
| CN103748644A (en) * | 2011-08-19 | 2014-04-23 | 罗伯特·博世有限公司 | Capacitor having a heat sink |
| JP2014050229A (en) * | 2012-08-31 | 2014-03-17 | Denso Corp | Rotary electric machine for vehicle |
| CN104604115A (en) * | 2013-05-21 | 2015-05-06 | 日立汽车系统株式会社 | Power conversion apparatus |
| CN206148285U (en) * | 2016-11-09 | 2017-05-03 | 南通亚旺电子制品有限公司 | Anti -explosion capacitor convenient to dismouting is changed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2019064897A1 (en) | 2020-10-15 |
| WO2019064897A1 (en) | 2019-04-04 |
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| PB01 | Publication | ||
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Application publication date: 20200417 |