CN111771318A - Motor with a stator having a stator core - Google Patents
Motor with a stator having a stator core Download PDFInfo
- Publication number
- CN111771318A CN111771318A CN201980015290.8A CN201980015290A CN111771318A CN 111771318 A CN111771318 A CN 111771318A CN 201980015290 A CN201980015290 A CN 201980015290A CN 111771318 A CN111771318 A CN 111771318A
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- China
- Prior art keywords
- bus bar
- holder
- cylindrical portion
- sensor magnet
- axial direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The motor has: a rotor rotatable about a central axis extending in an up-down direction; a stator located radially outside the rotor and having a plurality of coils; and a bus bar unit disposed at an upper side of the stator. The rotor has: a shaft extending along a central axis; and a sensor magnet located at an upper end of the shaft. The bus bar unit has: a bus bar connected to the coil; a magnetic member made of a magnetic material; and a bus bar holder extending along a plane perpendicular to the central axis, and supporting the bus bar and the magnetic member. The bus bar holder is provided with a central hole into which the shaft is inserted. The magnetic member has a cylindrical portion extending in the axial direction along the inner peripheral surface of the central hole. At least a part of the cylindrical portion overlaps the sensor magnet in the axial direction.
Description
Technical Field
The present invention relates to a motor.
Background
An electromechanical motor is known which detects the position of a rotor using a sensor magnet and a sensor. The following structure is disclosed in japanese patent application laid-open No. 2006-158059: by mounting the back yoke on the bracket for holding the bearing, magnetic noise generated from the outside of the sensor magnet is blocked, and the position detection accuracy is improved.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2006 and 158059
Disclosure of Invention
Problems to be solved by the invention
In the structure described in jp 2006-158059 a, since the back yoke is provided, the number of components increases, and the manufacturing process becomes complicated, which causes a problem of increasing the manufacturing cost.
In view of the above problems, an object of one embodiment of the present invention is to provide a motor that reduces manufacturing cost while suppressing the influence of magnetic noise on a sensor.
Means for solving the problems
A motor according to one embodiment of the present invention includes: a rotor rotatable about a central axis extending in an up-down direction; a stator located radially outside the rotor and having a plurality of coils; and a bus bar unit disposed at an upper side of the stator. The rotor has: a shaft extending along a central axis; and a sensor magnet located at an upper end of the shaft. The bus bar unit has: a bus bar connected to the coil; a magnetic member made of a magnetic material; and a bus bar holder extending along a plane perpendicular to the central axis, and supporting the bus bar and the magnetic member. The bus bar holder is provided with a central hole into which the shaft is inserted. The magnetic member has a cylindrical portion extending in the axial direction along the inner peripheral surface of the central hole. At least a part of the cylindrical portion overlaps the sensor magnet in the axial direction.
Effects of the invention
According to one embodiment of the present invention, a motor is provided in which the influence of magnetic noise on a sensor is suppressed and the manufacturing cost is reduced.
Drawings
Fig. 1 is a schematic sectional view of a motor according to an embodiment.
Fig. 2 is a perspective view of a phase bus bar unit of an embodiment.
FIG. 3 is a top view of an embodiment of a phase bus bar unit.
Detailed Description
Hereinafter, a bus bar unit and a motor according to an embodiment of the present invention will be described with reference to the drawings. In the drawings below, scales, numbers, and the like of the respective structures may be different from those of actual structures in order to facilitate understanding of the respective structures.
In each figure, the Z-axis is shown as appropriate. The Z-axis direction in each drawing is a direction parallel to the central axis J shown in fig. 1. 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 side and the lower side are directions for explanation only, and do not limit actual positional relationship and directions. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as "axial direction" or "vertical direction", a radial direction about the central axis J is simply referred to as "radial direction", and a circumferential direction about 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 the axial direction.
< Motor >
Fig. 1 is a schematic sectional view of a motor 1.
A control device (external device) 9 is connected to the motor 1. The control device 9 supplies power to the motor 1 via a control terminal 9a, and controls the rotation of the motor 1.
The motor 1 includes a rotor 3, a stator 4, a housing 2, a bearing holder 5, an upper bearing (bearing) 6A, a lower bearing (bearing) 6B, a neutral point bus bar unit 10, and a phase bus bar unit (bus bar unit) 20.
The rotor 3 is rotatable about a central axis J extending in the vertical direction. The rotor 3 includes a shaft 3a, a rotor core 3b, a rotor magnet 3c, a sensor magnet 3d, and a sensor magnet mounting member 3 e.
The shaft 3a extends along the central axis J. The shaft 3a is rotatably supported about a center axis J by an upper bearing 6A and a lower bearing 6B. The rotor core 3b is fixed to the outer peripheral surface of the shaft 3 a. The rotor magnet 3c is fixed to the outer peripheral surface of the rotor core 3 b.
A sensor magnet 3d is fixed to the upper end of the shaft 3 a. That is, the sensor magnet 3d is located at the upper end of the shaft 3 a. Fixing holes 3aa extending in the axial direction are provided in the upper end surfaces of the shafts 3a, respectively. The sensor magnet 3d is provided with a fixing hole 3da penetrating in the axial direction. The sensor magnet mounting member 3e is a rod extending in the axial direction. The sensor magnet attachment member 3e is fitted into the fixing hole 3aa of the shaft 3a and the fixing hole 3da of the sensor magnet 3 d. Thereby, the sensor magnet mounting member 3e fixes the shaft 3a and the sensor magnet 3d to each other.
The sensor magnet 3d rotates around the central axis J together with the shaft 3 a. The sensor magnet 3d is axially opposed to a rotation sensor 9b provided in the control device 9. That is, the sensor magnet 3d is located directly below the rotation sensor 9 b. The rotation sensor 9b is mounted on a lower surface of a circuit board (not shown) of the control device 9. The rotation sensor 9b measures the rotation angle of the rotor 3 from the change in magnetic flux of the sensor magnet 3 d.
The stator 4 is arranged in a ring shape around the center axis J. The stator 4 is located radially outside the rotor 3. The stator 4 and the rotor 3 are radially opposed to each other with a gap therebetween. The stator 4 surrounds the radially outer side of the rotor 3. The stator 4 is fixed to the inner peripheral surface of the housing 2. The stator 4 includes an annular stator core 4a, a pair of insulators 4b attached to the stator core 4a in the vertical direction, and a coil 7 wound around the stator core 4a with the insulators 4b interposed therebetween.
The plurality of coils 7 of the present embodiment constitute a three-phase circuit of a plurality of systems (two systems in the present embodiment). In each system, the U-phase, V-phase, and W-phase coils 7 are Y-wired. The stator 4 of the present embodiment is provided with 12 coils 7. Coil wires 7a extend from the respective coils 7. Of the 12 coil lines 7a, 6 coil lines 7a are connected to the phase bus bar 21 of the phase bus bar unit 20. The other 6 coil lines 7a are connected to the neutral point bus bar 11 of the neutral point bus bar unit 10.
The housing 2 is a cylindrical shape that is open to the upper side (+ Z side). The housing 2 houses the rotor 3, the stator 4, and the bearing holder 5. The housing 2 has a cylindrical portion 2a and a bottom portion 2 b. The cylindrical portion 2a surrounds the stator 4 from the radially outer side. The bottom portion 2b is located at the lower end of the cylindrical portion 2 a. A lower bearing holding portion 2c for holding the lower bearing 6B is provided at the center of the bottom portion 2B in a plan view.
The bearing holder 5 is located on the upper side of the stator 4. In addition, the bearing holder 5 is located between the phase busbar unit 20 and the neutral point busbar unit 10 in the axial direction. That is, the bearing holder 5 is located between the phase bus bar unit 20 and the stator 4. The bearing cage 5 is made of metal. The bearing holder 5 is held on the inner peripheral surface of the housing 2.
The bearing holder 5 has an upper bearing holding portion 5 a. The upper bearing holding portion 5a holds the upper bearing 6A. The bearing holder 5 rotatably supports the shaft 3a via an upper bearing 6A. The upper bearing holding portion 5a is located at the center of the bearing holder 5 in plan view. The upper bearing holding portion 5a includes a cylindrical holding portion 5aa extending in the axial direction about the central axis J, and an upper end projecting portion 5ab extending radially inward from an upper end of the cylindrical holding portion 5 aa. The upper-end protrusion 5ab positions the upper bearing 6A in the up-down direction. A hole 5c penetrating in the axial direction is provided at the center of the upper end protrusion 5ab in a plan view. The hole 5c allows the shaft 3a to pass through inward.
The bearing holder 5 is provided with a coil wire passage hole 5d and a screw hole 5f penetrating in the vertical direction. The coil wire 7a led out from the coil 7 and connected to the phase bus bar unit 20 passes through the coil wire passage hole 5 d. A fixing screw 8 for fixing the bus bar unit 20 to the bearing holder 5 is inserted into the screw hole 5 f.
The neutral point bus bar unit 10 is located on the upper side of the stator 4. The neutral point bus bar unit 10 has a plurality of (two in the present embodiment) neutral point bus bars 11 and a neutral point bus bar holder 12. The neutral point bus bar holder 12 holds the neutral point bus bar 11. In the present embodiment, a pair of neutral point bus bars 11 is provided on the neutral point bus bar unit 10.
The neutral point bus bar holder 12 extends along a plane perpendicular to the central axis J. The neutral point bus bar holder 12 has a leg portion 12 a. The leg portion 12a extends downward in the axial direction. The lower ends of the leg portions 12a contact the upper surface of the stator core 4 a. The neutral point bus bar holder 12 has a support portion 12 b. The support portion 12b extends upward in the axial direction. The support portion 12b surrounds the coil wire 7a and suppresses the contact of the coil wire 7a with the coil wire passage hole 5d of the bearing holder 5.
The neutral point bus bars 11 have 3 coil wire connection portions 11a, respectively. The neutral point bus bar 11 is connected to the coil wire 7a at the coil wire connecting portion 11 a. The neutral point bus bar 11 connects the coil lines 7a extending from the different coils 7 to each other, and constitutes a neutral point of the three-phase circuit.
(confluence bar unit for photo)
The phase bus bar unit 20 is located on the upper side of the stator 4 and the bearing holder 5. The phase bus bar unit 20 is provided between the coil wire 7a drawn out to the upper side of the bearing holder 5 and the control device 9, and electrically connects them.
Fig. 2 is a perspective view of the phase bus bar unit 20. Fig. 3 is a top view of the same bus bar unit 20.
As shown in fig. 2, the phase busbar unit 20 includes a plurality of (6 in the present embodiment) phase busbars (busbars) 21, a busbar holder 30, a pair of terminal receiving members 40, and a reinforcing member (magnetic member) 50.
The phase bus bar 21 has a bus bar main body portion 22, a coil wire connecting portion 24, and an external connection terminal 27. In the present embodiment, the bus bar main body portion 22 and the coil wire connecting portion 24 are one component. The external connection terminal 27 is a member different from the bus bar main body 22, and is connected to the bus bar main body 22. The external connection terminal 27 and the bus bar main body 22 may be one member.
Each part of the phase bus bar 21 is plate-shaped and is formed by press working. The bus bar main body 22 is processed so that the axial direction is the plate thickness direction, of the phase bus bar 21. The phase bus bar 21 is processed so that the direction perpendicular to the axial direction is the plate thickness direction in the coil wire connection portion 24 and the external connection terminal 27.
As shown in fig. 3, the phase bus bar 21 is embedded in the holder body portion 31 of the bus bar holder 30. That is, the bus bar holder 30 is manufactured by insert molding in which the phase bus bar 21 is embedded.
The bus bar main body portion 22 linearly extends along a plane perpendicular to the axial direction. A terminal connecting portion 22a is provided at one end of the bus bar main body portion 22. Further, a coil wire connecting portion 24 is connected to the other end of the bus bar main body 22.
The coil wire connecting portion 24 is connected to the coil wire 7 a. The coil wire connecting portion 24 grips the coil wire 7 a. The coil wire connection portion 24 has a substantially U-shape in plan view, which is open radially outward.
The terminal connecting portion 22a holds the external connection terminal 27. The terminal connecting portion 22a is provided with an insertion hole 22aa penetrating in the axial direction. The external connection terminal 27 is press-fitted into the insertion hole 22aa from below. Thereby, the phase bus bar 21 and the external connection terminal 27 are mechanically and electrically connected. The terminal connecting portion 22a and the external connection terminal 27 may be connected to each other by a welding method such as laser welding.
As shown in fig. 2, the external connection terminals 27 extend in the axial direction. The external connection terminal 27 of the present embodiment is provided with a slit 27a extending downward from the upper end portion. A control terminal 9a of the control device 9 is inserted into the slit 27 a. Thereby, the control device 9 is connected to the motor 1 via the external connection terminal 27.
As shown in fig. 3, a plurality of (6 in the present embodiment) phase bus bars 21 are classified into a 1 st bus bar group 28 and a 2 nd bus bar group 29. Each of the 1 st bus bar group 28 and the 2 nd bus bar group 29 includes a plurality of (3 in the present embodiment) phase bus bars 21. That is, the phase bus bar unit 20 has a plurality of phase bus bars 21, and the plurality of phase bus bars 21 are classified into a plurality of bus bar groups (1 st bus bar group 28 and 2 nd bus bar group 29).
The phase bus bars 21 belonging to the 1 st bus bar group 28 and the 2 nd bus bar group 29 are connected to the coils 7 of different systems, respectively. The 3 coils connected to the 3 phase bus bars 21 of the 1 st bus bar group 28 constitute 1 system of three-phase circuits, and the 3 coils connected to the 3 phase bus bars 21 of the 2 nd bus bar group 29 constitute other systems of three-phase circuits. The 1 st bus bar group 28 and the 2 nd bus bar group 29 include a U-phase bus bar, a V-phase bus bar, and a W-phase bus bar, respectively. That is, the 3-phase bus bars 21 of the 1 st bus bar group 28 and the 2 nd bus bar group 29 are connected to the U-phase, V-phase, and W-phase coils 7, respectively.
The 1 st bus bar group 28 and the 2 nd bus bar group 29 are arranged in the circumferential direction. The bus bar 21 for phase of the 1 st bus bar group 28 and the bus bar 21 for phase of the 2 nd bus bar group 29 are arranged in point symmetry about the central axis J. In the 1 st bus bar group 28 and the 2 nd bus bar group 29, the same-phase bus bars 21 have the same shape. Therefore, the number of components can be reduced in the phase bus bar unit 20.
The bus bars 21 for phase respectively included in the 1 st bus bar group 28 and the 2 nd bus bar group 29 are arranged to overlap each other in the radial direction in the bus bar main body portion 22. That is, in the 1 st bus bar group 28 and the 2 nd bus bar group 29, the bus bar main body portions 22 of the three phase bus bars 21 are arranged in a radial direction. Therefore, the region in which the phase bus bars 21 are arranged can be suppressed from expanding in the circumferential direction as viewed from the axial direction. This can shorten the length of the bus bar main body 22, reduce the material cost required for the phase bus bar 21, reduce the cost, and reduce the weight of the phase bus bar unit 20.
As shown in fig. 1, the bus bar holder 30 is provided on the upper side (one axial side) of the stator. The bus bar holder 30 extends along a plane perpendicular to the central axis J. The bus bar holder 30 is made of a resin material.
The bus bar holder 30 includes a holder body portion 31, a cylindrical portion 33, and a plurality of (6 in the present embodiment) square cylindrical portions 37.
The holder body portion 31 extends along a plane perpendicular to the center axis J. The holder body portion 31 has an upper surface 31a facing the upper side (one axial side) and a lower surface 31b facing the lower side (the other axial side). The phase bus bar 21 and the reinforcing member 50 are embedded in the holder main body 31. Thereby, the bus bar holder 30 supports the phase bus bar 21 and the reinforcing member 50. The bus bar holder 30 is reinforced by the phase junction bar 21 and the reinforcing member 50.
The holder main body 31 is provided with a center hole 35 centered on the center axis J. That is, the bus bar holder 30 is provided with a center hole 35. The central hole 35 penetrates in the axial direction. The central hole 35 is circular when viewed axially. The central hole 35 allows the shaft 3a to pass through inward.
As shown in fig. 3, the holder main body portion 31 has a pair of bus bar embedding regions 31A and a pair of reinforcing member embedding regions 31B around the central hole 35. The bus bar embedded regions 31A and the reinforcing member embedded regions 31B are alternately arranged along the circumferential direction.
The bus bar main bodies 22 of the phase bus bars 21 are embedded in the pair of bus bar embedding regions 31A. The pair of bus bar embedded regions 31A are arranged on opposite sides in the radial direction with respect to each other through the center hole 35 when viewed in the axial direction. In one of the pair of bus bar embedding regions 31A, 3 phase bus bars 21 belonging to the 1 st bus bar group 28 are embedded, and in the other, 3 phase bus bars 21 belonging to the 2 nd bus bar group 29 are embedded. Therefore, the 1 st bus bar group 28 and the 2 nd bus bar group 29 are arranged on the opposite sides in the radial direction from each other with the center hole 35 therebetween when viewed from the axial direction.
A pair of radial extending portions 54B of the reinforcing member 50 described later are embedded in the pair of reinforcing member embedding regions 31B, respectively. The pair of reinforcing member embedding regions 31B are arranged on the opposite sides in the radial direction with respect to each other through the center hole 35 when viewed from the axial direction.
The holder main body portion 31 is reinforced by the phase bus bar 21 in the bus bar embedding region 31A. Further, the holder body 31 is reinforced by the reinforcing member 50 in the reinforcing member embedding region 31B.
As shown in fig. 1, the cylindrical portion 33 extends in the axial direction from the peripheral edge of the central hole 35 of the holder body portion 31. In the present embodiment, the cylindrical portion 33 extends upward and downward with respect to the holder body portion 31.
The outer peripheral surface of the cylindrical portion 33 is circular when viewed in the axial direction. The inner circumferential surface of the cylindrical portion 33 coincides with the inner circumferential surface of the center hole 35 when viewed in the axial direction. The outer peripheral surface of the cylindrical portion 33 is fitted into a hole portion 5c provided in the bearing holder 5 below the holder body portion 31. Thereby, the phase bus bar unit 20 is positioned in the radial direction.
As shown in fig. 2, the square tubular portion 37 extends upward from the upper surface 31a of the holder body portion 31. The square tube 37 is a rectangular square tube as viewed from the axial direction. The square tube portion 37 is provided in the bus bar holder 30 in the same number (i.e., 6) as the number of the external connection terminals 27 provided in the corresponding bus bar unit 20. A terminal passage hole 37a penetrating in the axial direction is provided inside the square tubular portion 37. The terminal passing hole 37a surrounds the external connection terminal 27. Thereby, the square tube 37 protects the external connection terminal 27.
The terminal receiving member 40 is plate-shaped and extends along a plane perpendicular to the axial direction. The terminal receiving member 40 is fixed to the lower surface 31b of the holder body 31. One of the pair of terminal receiving members 40 is positioned below the three terminal connecting portions 22a of the 1 st bus bar group 28. One of the pair of terminal receiving members 40 is positioned below the three terminal connecting portions 22a of the 2 nd bus bar group 29.
The terminal receiving member 40 is in contact with the lower end of the external connection terminal 27 on a support surface (not shown) facing upward. The external connection terminal 27 receives a stress directed downward from the control terminal 9a of the control device 9 when connected to the control device 9. The terminal receiving member 40 supports the external connection terminal 27 on the support surface, and prevents the external connection terminal 27 from coming out of the insertion hole 22aa of the phase bus bar 21.
As shown in fig. 1, at least a part of the reinforcing member 50 is embedded inside the bus bar holder 30. That is, the bus bar holder 30 is manufactured by insert molding in which the reinforcing member 50 is embedded. The reinforcing member 50 is made of a metal material and reinforces the bus bar holder 30. In addition, the reinforcing member 50 is made of a magnetic material.
The reinforcing member 50 includes a cylindrical portion 51, a flat plate portion 54, a pair of bent portions 53, and a pair of fixing portions 52. The reinforcing member 50 is embedded in the bus bar holder 30 in the cylindrical portion 51 and a part of the flat plate portion 54.
The cylindrical portion 51 extends cylindrically in the axial direction. The cylindrical portion 51 surrounds the center axis J. Therefore, the reinforcing member 50 extends in the axial direction along the inner peripheral surface of the central hole 35 provided in the bus bar holder 30. In the present embodiment, the cylindrical portion 51 has a cylindrical shape. However, the shape of the cylindrical portion 51 in plan view is not limited to a circle, and may be a square cylinder having a rectangular shape in plan view.
The upper end of the shaft 3a is disposed inside the cylindrical portion 51. Further, a sensor magnet 3d fixed to the upper end portion of the shaft 3a is disposed inside the cylindrical portion 51. That is, the cylindrical portion 51 surrounds the sensor magnet 3d from the outside in the radial direction.
In the phase busbar unit 20, an ac current flows through the phase busbar 21 disposed around the central hole 35. Therefore, a magnetic field is generated around the phase bus bar 21 in accordance with a change in the current flowing through the phase bus bar 21. As described above, the magnetic field generated from the sensor magnet 3d is detected by the rotation sensor 9b provided in the control device 9, and is used for measurement based on the rotation angle of the rotation sensor 9 b. Therefore, the magnetic flux of the sensor magnet 3d is influenced by the magnetic field generated from the phase bus bar 21, and may influence the measurement of the rotation angle by the rotation sensor 9 b. According to the present embodiment, the reinforcing member 50 is made of a magnetic material, and the sensor magnet 3d is surrounded by the cylindrical portion 51. Therefore, the cylindrical portion 51 functions as a magnetic shield. That is, the cylindrical portion 51 suppresses the magnetic noise from the outside of the cylindrical portion 51 from affecting the magnetic flux of the sensor magnet 3d located inside the cylindrical portion 51. As a result, the accuracy of the measurement of the rotation angle by the rotation sensor 9b can be improved, and the motor 1 with high reliability can be configured.
In the present embodiment, the phase bus bar 21 has the external connection terminal 27 extending upward with respect to the bus bar holder 30. Therefore, the magnetic field generated by the external connection terminal 27 easily affects the measurement accuracy of the rotation angle of the rotation sensor 9b located above the sensor magnet 3 d. According to the present embodiment, the cylindrical portion 51 blocks the gap between the external connection terminal 27 and the sensor magnet 3 d. Therefore, the influence of the magnetic field generated from the external connection terminal 27 on the inside of the cylindrical portion 51 can be suppressed, and the accuracy of the measurement of the rotation angle by the rotation sensor 9b can be improved.
In the present embodiment, the upper end of the cylindrical portion 51 is located above the upper end of the sensor magnet 3 d. Therefore, according to the present embodiment, it is possible to suppress the influence of the magnetic field generated from the phase bus bar 21 on the magnetic flux heading upward from the upper end of the sensor magnet 3 d. The lower end of the cylindrical portion 51 is located below the lower end of the sensor magnet 3 d. Therefore, according to the present embodiment, it is possible to suppress the influence of the magnetic field generated from the phase bus bar 21 on the magnetic flux that comes out of the upper end of the sensor magnet 3d and enters the sensor magnet 3d from the lower end. In the present embodiment, the case where the cylindrical portion 51 surrounds the entire axial length of the sensor magnet 3d is exemplified. However, if at least a part of the cylindrical portion 51 overlaps the sensor magnet 3d in the axial direction, it is possible to suppress the influence of magnetic noise from the outside of the cylindrical portion 51 on the magnetic flux of the sensor magnet 3d, and to achieve a certain effect of improving the measurement accuracy of the rotation sensor 9 b.
The cylindrical portion 51 is embedded in the cylindrical portion 33 of the bus bar holder 30. In order to ensure insulation of the phase bus bars 21 from each other, the bus bar holder 30 is made of a resin material. Therefore, the strength of the bus bar holder 30 is lower than that of the metal material. Further, since the bus bar holder 30 is provided with the center hole 35 through which the center axis J passes, the strength around the center hole 35 is low. According to the present embodiment, the cylindrical portion 51 surrounding the central hole 35 is embedded in the bus bar holder 30, and the periphery of the central hole 35 of the bus bar holder 30 is reinforced, whereby damage to the bus bar holder 30 can be suppressed even when stress is applied to the bus bar holder 30.
According to the present embodiment, the cylindrical portion 33 functioning as a magnetic shield is embedded in the bus bar holder 30. Therefore, the bus bar holder 30 and the cylindrical portion 33 can be handled as one component. According to the present embodiment, the cost of the assembly process and the like can be reduced and the motor 1 can be manufactured at low cost, as compared with the case where the bus bar holder and the magnetic shield are provided as separate members.
The flat plate portion 54 extends from the cylindrical portion 51 in the radial direction along a plane perpendicular to the center axis J. As shown in fig. 3, the flat plate portion 54 has an annular portion 54a surrounding the center hole 35 and a pair of radially extending portions 54b extending radially outward from the annular portion 54 a.
The flat plate portion 54 is embedded in the holder body portion 31 except for the radially outer end portion of the radially extending portion 54 b. That is, at least a part of the flat plate portion 54 is embedded in the holder main body portion 31 of the bus bar holder 30. Thereby, the flat plate portion 54 reinforces the holder main body portion 31. A fixing portion 52 is connected to a radially outer edge portion of the radially extending portion 54b via a bent portion 53.
A pair of radial extensions 54b extend in the radial direction, respectively. The radially extending portion 54b is located between the 1 st bus bar group 28 and the 2 nd bus bar group 29 in the circumferential direction. That is, the radially extending portions 54b extend radially between the circumferentially adjacent bus bar groups.
In the present embodiment, the plurality of phase bus bars 21 are classified into the 1 st bus bar group 28 and the 2 nd bus bar group 29, and are fixedly arranged for each bus bar group. The bus bars 21 for each phase are embedded in the bus bar embedding region 31A of the holder main body portion 31. The holder main body portion 31 is reinforced by the phase bus bar 21 in the bus bar embedding region 31A. On the other hand, the radially extending portion 54B is embedded in the reinforcing member embedding region 31B of the cage body portion 31. The reinforcing member embedded regions 31B are located between the bus bar embedded regions 31A in the circumferential direction. Therefore, the radially extending portion 54B reinforces a region between the pair of bus bar embedding regions 31A (i.e., the reinforcing member embedding region 31B). According to the present embodiment, the plurality of bus bar groups and the radially extending portions 54b are alternately embedded in the holder main body portion 31 in the circumferential direction. This strengthens the entire circumferential region of the holder body 31, and can effectively suppress damage to the bus bar holder 30. The phase bus bar 21 and the reinforcing member 50, which are made of metal, have higher heat conduction characteristics than the holder body 31, which is made of resin. When the region in which the metal material is embedded and the region in which the metal material is not embedded are provided in the holder main body portion 31, respectively, the cooling efficiency is different for each region, and therefore warping at the time of molding the bus bar holder 30 is likely to become significant. According to the present embodiment, since the metal material is embedded in the entire circumferential region of the holder main body portion 31, warping at the time of molding the holder main body portion 31 can be suppressed.
The annular portion 54a extends annularly along the outer peripheral surface of the cylindrical portion 51. The annular portion 54a is connected to the outer peripheral surface of the cylindrical portion 51. The annular portion 54a surrounds the central hole 35 of the bus bar holder 30. Since the annular portion 54a is embedded in the holder body portion 31, the periphery of the central hole 35 of the bus bar holder 30 is reinforced. Thus, even when stress is applied to the bus bar holder 30, damage to the bus bar holder 30 can be suppressed.
The annular portion 54a is located between the pair of radially extending portions 54b, connecting the pair of radially extending portions 54b to each other. That is, a plurality of (two in the present embodiment) radially extending portions 54b are connected to each other via the annular portion 54 a. This can increase the rigidity of the plurality of radially extending portions 54b by the annular portion 54 a. As a result, the reinforcing effect of the radially extending portion 54b on the cage main body portion 31 can be improved.
In the present embodiment, the flat plate portion 54 is disposed at a position different from the position of the phase bus bar 21 when viewed from the axial direction. That is, the flat plate portion 54 does not overlap the corresponding bus bar 21 in the axial direction. The holder main body portion 31 is reinforced by the flat plate portion 54 and the phase bus bar 21. By providing the flat plate portion 54 and the phase bus bar 21 at different positions from each other when viewed from the axial direction, the flat plate portion 54 is not excessively embedded in the holder main body portion 31. Therefore, the strength of the bus bar holder 30 as a whole can be increased in a balanced manner while suppressing the weight of the corresponding bus bar unit 20.
As shown in fig. 1, the bent portion 53 and the fixed portion 52 are not embedded in the bus bar holder 30. That is, the bent portion 53 and the fixing portion 52 are exposed from the bus bar holder 30. The bent portion 53 is located at a radially outer end of the radially extending portion 54b of the flat plate portion 54. The bent portion 53 connects the flat plate portion 54 and the fixed portion 52. The bent portion 53 is bent downward relative to the flat plate portion 54. On the other hand, the fixing portion 52 extends in a plate shape along a plane perpendicular to the central axis J. By providing the bent portion 53 between the flat plate portion 54 and the fixed portion 52, the fixed portion 52 is disposed below the flat plate portion 54.
The lower surface of the fixing portion 52 is in contact with the upper surface of the bearing holder 5. The fixing portion 52 is provided with a through hole 52a penetrating in the axial direction. A fixing screw 8 for fixing the bus bar unit 20 to the bearing holder 5 is inserted into the through hole 52 a. Thereby, the phase bus bar unit 20 is fixed to another member (the bearing holder 5 in the present embodiment) at the fixing portion 52.
Since the bus bar holder 30 is composed of a resin material, when the bus bar holder 30 is to be directly fixed to another member (for example, the bearing holder 5), the bus bar holder 30 may be damaged due to a fastening force at the time of fixing. According to the present embodiment, the phase busbar unit 20 is fixed to the bearing holder 5 at the fixing portion 52 of the reinforcing busbar holder 30. In order to reinforce the bearing holder 5, the reinforcing member 50 has a high strength as compared with the resin material constituting the bearing holder 5. In particular, in the present embodiment, the reinforcing member 50 is made of a metal material. Therefore, when the phase bus bar unit 20 is fixed to the bearing holder 5, damage to a part of the phase bus bar unit 20 can be suppressed.
According to the present embodiment, the reinforcing member 50 reinforcing the bus bar holder 30 has the fixing portion 52. That is, the reinforcing member 50 has a function of reinforcing the bus bar holder 30 and a function of fixing the bus bar unit 20 in use to other members. Therefore, an increase in the number of components can be suppressed as compared with the case where the bus bar unit has the bus bar holder and the fixing member, respectively. As a result, not only the manufacturing cost of the components but also the management cost of the components accompanying the increase in the number of components can be suppressed, and the motor 1 can be manufactured at low cost.
In the present embodiment, the case where the fixing portion 52 is fixed to the bearing holder 5 is exemplified, but the fixing portion 52 may be fixed to a member other than the phase bus bar unit 20 constituting the motor 1. For example, the fixing portion 52 may be fixed to the stator 4. In the present embodiment, the fixing portion 52 is fixed to another member by the fixing screw 8, but the fixing portion 52 may be fixed to another member by another means. For example, the fixing portion 52 may be fixed to another member by caulking.
In the present embodiment, the case where the reinforcing member 50 is made of a metal material is described. However, as long as the cylindrical portion 51 is made of a magnetic material and the fixing portion 52 is made of a material having higher strength than the bus bar holder 30, the reinforcing member 50 may be made of other materials.
In the present embodiment, a case where the present invention is applied to the phase bus bar unit 20 is described. However, the bus bar unit to which the structure of the present invention is applied may also be a bus bar unit having a neutral point bus bar. That is, the bus bar provided in the bus bar unit may be a neutral point bus bar or a phase bus bar as long as it is connected to the coil.
While the embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other modifications of the configurations can be made without departing from the spirit of the present invention. The present invention is not limited to the embodiments.
Description of the reference symbols
1: a motor; 3: a rotor; 3 a: a shaft; 3 d: a sensor magnet; 4: a stator; 5: a bearing retainer; 6A: an upper side bearing (bearing); 7: a coil; 20: a phase bus bar unit (bus bar unit); 21: a phase bus bar (busbar); 27: an external connection terminal; 30: a bus bar holder; 35: a central bore; 50: a reinforcing member (magnetic member); 51: a cylindrical portion; 52: a fixed part; 52 a: a through hole; 54: a flat plate portion; 54 a: an annular portion; 54 b: a radial extension; j: a central axis.
Claims (9)
1. A motor, comprising:
a rotor rotatable about a central axis extending in an up-down direction;
a stator located radially outside the rotor and having a plurality of coils; and
a bus bar unit disposed at an upper side of the stator,
the rotor has:
a shaft extending along the central axis; and
a sensor magnet located at an upper end of the shaft,
the bus bar unit has:
a bus bar connected to the coil;
a magnetic member made of a magnetic material; and
a bus bar holder extending along a plane perpendicular to the central axis, supporting the bus bar and the magnetic member,
a central hole into which the shaft is inserted is provided on the bus bar holder,
the magnetic member has a cylindrical portion extending in an axial direction along an inner peripheral surface of the central hole,
at least a part of the cylindrical portion overlaps the sensor magnet in the axial direction.
2. The motor of claim 1,
the magnetic member has a flat plate portion extending in a radial direction from the cylindrical portion along a plane perpendicular to the central axis,
at least a part of the flat plate portion is embedded in the bus bar holder.
3. The motor of claim 2,
the flat plate portion is disposed at a position different from the bus bar when viewed in the axial direction.
4. The motor according to claim 2 or 3,
the bus bar unit has a plurality of the bus bars,
the plurality of bus bars are classified into a plurality of bus bar groups,
a plurality of the bus bar groups are arranged in a circumferential direction,
the flat plate portion has a plurality of radially extending portions that radially extend between the bus bar groups adjacent in the circumferential direction to each other.
5. The motor of claim 4,
the flat plate portion has an annular portion extending annularly along an outer peripheral surface of the cylindrical portion,
a plurality of the radially extending portions are connected to each other via the annular portion.
6. The motor according to any one of claims 1 to 5,
at least a part of the bus bar is embedded in the bus bar holder.
7. The motor according to any one of claims 1 to 6,
the bus bar has an external connection terminal extending in an axial direction,
the cylindrical portion shields a gap between the external connection terminal and the sensor magnet.
8. The motor according to any one of claims 1 to 7,
the upper end of the cylindrical portion is located above the upper end of the sensor magnet.
9. The motor according to any one of claims 1 to 8,
the lower end of the cylindrical portion is located below the lower end of the sensor magnet.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-034515 | 2018-02-28 | ||
| JP2018034515 | 2018-02-28 | ||
| PCT/JP2019/006856 WO2019167843A1 (en) | 2018-02-28 | 2019-02-22 | Motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111771318A true CN111771318A (en) | 2020-10-13 |
Family
ID=67804932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980015290.8A Pending CN111771318A (en) | 2018-02-28 | 2019-02-22 | Motor with a stator having a stator core |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111771318A (en) |
| WO (1) | WO2019167843A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158059A (en) * | 2004-11-29 | 2006-06-15 | Yaskawa Electric Corp | Magnetic encoder and motor equipped with the same |
| CN106208537A (en) * | 2015-05-25 | 2016-12-07 | 株式会社捷太格特 | Rotary angle detecting device |
| JP2017051014A (en) * | 2015-09-03 | 2017-03-09 | 日立オートモティブシステムズ株式会社 | Motor control device |
| CN109478820A (en) * | 2016-07-18 | 2019-03-15 | Lg伊诺特有限公司 | Motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014054095A1 (en) * | 2012-10-01 | 2014-04-10 | トヨタ自動車株式会社 | Internal combustion engine |
| KR102146023B1 (en) * | 2016-01-07 | 2020-08-19 | 엘지이노텍 주식회사 | Motor and electronic power steering system having the same |
-
2019
- 2019-02-22 WO PCT/JP2019/006856 patent/WO2019167843A1/en active Application Filing
- 2019-02-22 CN CN201980015290.8A patent/CN111771318A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158059A (en) * | 2004-11-29 | 2006-06-15 | Yaskawa Electric Corp | Magnetic encoder and motor equipped with the same |
| CN106208537A (en) * | 2015-05-25 | 2016-12-07 | 株式会社捷太格特 | Rotary angle detecting device |
| JP2017051014A (en) * | 2015-09-03 | 2017-03-09 | 日立オートモティブシステムズ株式会社 | Motor control device |
| CN109478820A (en) * | 2016-07-18 | 2019-03-15 | Lg伊诺特有限公司 | Motor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019167843A1 (en) | 2019-09-06 |
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