CN111446786A - Rotating electrical machine - Google Patents
Rotating electrical machine Download PDFInfo
- Publication number
- CN111446786A CN111446786A CN202010046002.XA CN202010046002A CN111446786A CN 111446786 A CN111446786 A CN 111446786A CN 202010046002 A CN202010046002 A CN 202010046002A CN 111446786 A CN111446786 A CN 111446786A
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- China
- Prior art keywords
- electromagnetic steel
- housing
- stator core
- steel sheet
- fastening
- Prior art date
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a rotating electric machine capable of preventing an insulating member from being damaged and preventing a coil from being short-circuited. A rotating electrical machine (1) is provided with: a stator (5) having a stator core (6) and a coil (7) attached to the stator core (6); a housing (9); and a fastening member (8) that fixes the stator (5) to the housing (9). The housing (9) is formed of a material having a higher linear expansion coefficient than the stator core (6). An outer peripheral edge (42A) of a fastening portion (40A) of a first electromagnetic steel sheet (10A) that is in contact with a housing (9) among a plurality of electromagnetic steel sheets (10) that form a stator core (6) is formed radially inward of an outer peripheral edge (42B) of a fastening portion (40B) of a second electromagnetic steel sheet (10B) that is adjacent to the first electromagnetic steel sheet (10A).
Description
Technical Field
The present invention relates to a rotating electric machine mounted on an electric vehicle or the like.
Background
Conventionally, a rotating electrical machine has been used as a power source or a power generation source for a vehicle such as a hybrid vehicle. The rotating electric machine includes a stator.
For example, a rotating electric machine of patent document 1 includes a stator having a stator core and a coil. The stator core is formed in a ring shape by laminating a plurality of ring-shaped plates in the axial direction. An insulating portion such as a coating film or insulating paper is wound around the coil. The mounting portion of the stator core is fixed to the housing (stator support member) by, for example, bolts or the like.
The plurality of teeth are provided at intervals in the circumferential direction on the inner peripheral edge of the yoke portion. Slots for accommodating coils are formed between circumferentially adjacent teeth. The tooth has a tooth body and a flange portion.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2010-279232
Problems to be solved by the invention
However, in such a rotating electrical machine, the flange portion of the tooth may contact an insulating member such as an insulating film or insulating paper surrounding the coil from the radial direction, thereby damaging the insulating member, which may cause a short circuit. This is explained with reference to fig. 9.
As shown in fig. 9 (a) to (d), the stator core 106 is fixed to the contact portion 190 of the housing 109 by the axial force AR of the bolt. Stator core 106 is formed by laminating electromagnetic steel sheets 110 in the axial direction. The surface of electromagnetic steel sheet 110 is coated with resin, for example. The material of the housing is, for example, aluminum. The housing 109 has a linear expansion coefficient larger than that of the electromagnetic steel sheet 110.
First, as shown in fig. 9 (a), the outer peripheral edge 112 of the magnetic steel sheet 110 is positioned radially flush with the end 193 of the contact portion 190 of the housing 109. At this time, the temperature of the rotating electric machine is normal temperature (for example, 20 degrees celsius).
Next, as shown in fig. 9 (b), when the rotating electric machine is in a high load state, the temperature of the rotating electric machine rises and becomes a high temperature (e.g., 150 degrees celsius). Thus, the stator core 106 and the housing 109 are thermally expanded, but the housing 109 having a large linear expansion coefficient is expanded more than the stator core 106.
At this time, since the friction coefficient between the contact portion 190 of the housing 109 and the magnetic steel plates 110 is larger than the friction coefficient between the magnetic steel plates 110, the magnetic steel plate 110A in contact with the contact portion 190 of the housing 109 is pulled radially outward by the friction force between the contact portion 190 of the housing 109. As a result, magnetic steel sheet 110A abutting against abutting portion 190 of case 109 protrudes outward in the radial direction of magnetic steel sheet 110B adjacent to magnetic steel sheet 110A. Further, due to a load input from the contact portion 190 of the housing 109 to the magnetic steel sheet 110A by the axial force AR of the bolt, the outer peripheral edge 112A of the magnetic steel sheet 110A is deformed so as to warp toward the magnetic steel sheet 110B.
Next, as shown in fig. 9 (c), when the rotating electric machine changes from the high load state to the low load state or the no load state, the temperature of the rotating electric machine decreases. In this way, the stator core 106 and the housing 109 are both contracted, but the contact portion 190 of the housing 109 having a large linear expansion coefficient is contracted more than the stator core.
At this time, since the friction coefficient between the contact portion 190 of the housing 109 and the magnetic steel plates 110 is larger than the friction coefficient between the magnetic steel plates 110, the magnetic steel plate 110A in contact with the contact portion 190 of the housing 109 is pulled radially inward by the friction force with the contact portion 190 of the housing 109. However, since outer peripheral edge 112A of magnetic steel sheet 110A is warped toward magnetic steel sheet 110B, bent portion 113A of magnetic steel sheet 110A is caught on magnetic steel sheet 110B.
As a result, as shown in fig. 9 (d), even when the temperature returns to normal temperature, the magnetic steel sheet 110A abutting against the abutting portion 190 of the housing 109 does not return to the position where the outer peripheral edge 112A and the outer peripheral edge 112B of the magnetic steel sheet 110B are flush with each other in the radial direction. Therefore, the flange portion of the tooth of magnetic steel sheet 110A is positioned radially outward of the flange portion of the tooth of magnetic steel sheet 110B. Thus, the flange portion of the teeth of electromagnetic steel sheet 110A may contact an insulating member such as an insulating film or insulating paper surrounding the coil from the radial direction, thereby damaging the insulating member, which may cause a short circuit.
Disclosure of Invention
The invention provides a rotating electric machine capable of preventing an insulating member from being damaged and preventing a coil from being short-circuited.
Means for solving the problems
The present invention relates to:
a rotating electrical machine is provided with:
a stator having a substantially annular stator core having a plurality of slot portions and a coil attached to the stator core;
a housing formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member that fixes the stator to the housing,
the coil has a plurality of slot coil portions inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member,
the stator core is formed of a plurality of stacked electromagnetic steel plates, and has a fastening portion that protrudes radially outward and is formed with a through-hole through which the fastening member passes,
the housing has an abutting portion abutting against the stator core and formed with a fastening hole to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
an outer peripheral edge of the fastening portion of a first electromagnetic steel plate, which is in contact with the housing, of the plurality of electromagnetic steel plates is formed radially inward of an outer peripheral edge of the fastening portion of a second electromagnetic steel plate adjacent to the first electromagnetic steel plate.
Furthermore, the invention relates to:
a rotating electrical machine is provided with:
a stator having a substantially annular stator core having a plurality of slot portions and a coil attached to the stator core;
a housing formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member that fixes the stator to the housing,
the coil has a plurality of slot coil portions inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member,
the stator core is formed of a plurality of stacked electromagnetic steel plates, and has a fastening portion that protrudes radially outward and is formed with a through-hole through which the fastening member passes,
the housing has an abutting portion abutting against the stator core and formed with a fastening hole to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
the abutting portion of the housing is formed radially inward of an outer peripheral edge of the fastening portion of a first electromagnetic steel plate abutting against the housing and an outer peripheral edge of the fastening portion of a second electromagnetic steel plate adjacent to the first electromagnetic steel plate, among the plurality of electromagnetic steel plates.
Effects of the invention
According to the present invention, when the temperature of the rotating electric machine is raised and then returned to normal temperature, the first electromagnetic steel sheet can be returned to its original position without being caught by the second electromagnetic steel sheet, and therefore, damage to the insulating member and short-circuiting of the coil due to the first electromagnetic steel sheet can be prevented.
Drawings
Fig. 1 is a view of a rotating electric machine according to a first embodiment of the present invention, as viewed from the axial direction of a rotor shaft.
Fig. 2 is an enlarged view of a main portion of the rotor core when the shape of the rotor core is viewed obliquely from above.
Fig. 3 is a sectional view a-a of fig. 1.
Fig. 4 is an enlarged view of the region ER of fig. 3.
Fig. 5 is an explanatory view for explaining outer peripheral edges of fastening portions of the first magnetic steel sheet and the second magnetic steel sheet.
Fig. 6 is an explanatory diagram for explaining the operation of the stator core and the housing due to a temperature change of the rotating electric machine.
Fig. 7 is an explanatory diagram illustrating a structure of the rotating electric machine according to the second embodiment.
Fig. 8 is an explanatory diagram for explaining the operation of the stator core and the housing due to a temperature change of the rotating electric machine in the second embodiment.
Fig. 9 is an explanatory diagram for explaining the problem.
Description of reference numerals:
1. 1A rotating electric machine
5 stator
6 stator core
7 coil
7A slot coil part
7B insulating member
8 fastening part
9 casing
10 electromagnetic steel sheet
10A first electromagnetic steel sheet
10B second electromagnetic steel sheet
39 groove part
40. 40A, 40B fastening part
41 through hole
42. 42A, 42B outer circumference
90. 90A abutting part
91 fastening hole
Detailed Description
Hereinafter, embodiments of a rotating electric machine according to the present invention will be described with reference to the drawings. The rotating electric machine of the present invention includes at least a rotating electric machine for power generation and driving.
[ 1 st embodiment ]
First, a rotating electrical machine 1 according to a first embodiment of the present invention will be described with reference to fig. 1 to 6. In the drawings, for the sake of easy observation, only a part of the portions having the same attributes may be denoted by reference characters. In addition, when the members have the same shape, structure, and the like, the same reference numerals are sometimes given to the respective members for easy understanding of the drawings.
< construction of rotating Electrical machine >
As shown in fig. 1, the rotating electric machine 1 includes a rotor 3, a stator 5, and a casing 9.
The rotor 3 has a rotor shaft 2. The rotor shaft 2 has a central axis C at its center. The central axis C is parallel to the rotor shaft 2 and is a straight line defined in a three-dimensional space. Fig. 1 is a view of the center axis C as viewed from the axial direction, and shows a state where the center axis C appears as one point.
In the present embodiment, the radially outer side refers to a direction from a point to a circle by drawing a circle around the point in a state where the central axis C appears to be the point. The radially inner side is a direction from a circle to a point by drawing a circle around the point in a state where the central axis C appears to be a point. In addition, the circumferential direction means a direction along a circle.
The stator 5 includes a substantially annular stator core 6 and a coil 7 attached to the stator core 6. The stator 5 is fixed to the housing 9 by a fastening member 8. The fastening member 8 is, for example, a bolt.
As shown in fig. 2, stator core 6 is formed by laminating a plurality of electromagnetic steel sheets 10 in the axial direction. The surface of the electromagnetic steel sheet 10 is coated with a resin.
The stator core 6 includes: a substantially annular yoke portion 20; a plurality of tooth portions 30, the tooth portions 30 being formed to protrude radially inward from the inner peripheral edge 21 of the yoke portion 20 and arranged in a ring shape in the circumferential direction; and a plurality of fastening portions 40, wherein the fastening portions 40 protrude radially outward from the outer peripheral edge 22 of the yoke portion 20, and through holes 41 through which the fastening members 8 pass are formed. In the present embodiment, the number of the fastening portions 40 is 6.
Two flange portions 31 protruding to both sides in the circumferential direction are formed at the tip of the tooth portion 30. A slot portion 39 surrounded by the bottom wall surface 33, the first side wall surface 35, and the second side wall surface 37 is formed between the teeth portions 30. The slot portion 39 accommodates the coil 7.
As shown in fig. 3 and 4, the coil 7 has a plurality of slot coil portions 7A laminated in the radial direction into which slot portions 39 of the stator core 6 are inserted, and among the plurality of slot coil portions 7A, adjacent slot coil portions 7A are insulated by an insulating member 7B. The slot coil portions 7A are arranged substantially parallel to the central axis C in the longitudinal direction and at substantially equal intervals.
The insulating member 7B is, for example, insulating paper. This facilitates manufacture of the slot coil portion 7A.
The housing 9 has an abutting portion 90, and the abutting portion 90 abuts against the stator core 6 to form a fastening hole 91 to which the fastening member 8 is fastened. The stator core 6 is disposed such that the fastening portion 40 abuts against the abutting portion 90 of the housing 9 in the axial direction. The fastening member 8 is inserted through the through hole 41 formed in the fastening portion 40 of the electromagnetic steel plate 10 and fastened to the fastening hole 91 formed in the contact portion 90 of the housing 9, whereby the stator 5 is fixed to the housing 9.
The case 9 is formed of a material having a higher linear expansion coefficient than the electromagnetic steel plates 10 constituting the stator core 6. The material of the housing 9 is, for example, aluminum. The linear expansion coefficient is a ratio of a length and a volume expansion of the object due to a temperature increase per unit temperature.
The electromagnetic steel plates 10 constituting the stator core 6 include a first electromagnetic steel plate 10A axially abutting against the abutting portion 90 of the housing 9, and a second electromagnetic steel plate 10B adjacent to the first electromagnetic steel plate 10A. The magnetic steel sheets 10 including the first magnetic steel sheet 10A and the adjacent second magnetic steel sheet 10B are all formed of the same material and differ only in shape. In the present embodiment, the magnetic steel sheets 10 (including the second magnetic steel sheet 10B) other than the first magnetic steel sheet 10A are the same in shape.
As shown in fig. 4 and 5, the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A that is in contact with the contact portion 90 of the housing 9 is formed radially inward of the outer peripheral edge 42B of the fastening portion 40B of the second electrical steel sheet 10B adjacent to the first electrical steel sheet 10A.
The operation of the stator core 6 and the housing 9 due to a temperature change of the rotating electric machine 1 will be described in detail with reference to fig. 6.
As shown in fig. 6 (a) to (d), the stator core 6 is fixed to the contact portion 90 of the housing 9 by the axial force AR of the fastening member 8. The axial force AR of the fastening member 8 is a force in a direction parallel to the central axis C.
First, as shown in fig. 6 (a), the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A that is in contact with the contact portion 90 of the housing 9 is formed radially inward of the outer peripheral edge 42B of the fastening portion 40B of the second electrical steel sheet 10B adjacent to the first electrical steel sheet 10A. Further, the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A is formed radially inward of the end 93 of the contact portion 90 of the housing 9. In the present embodiment, the outer peripheral edge 42 of the fastening portion 40 of the magnetic steel sheets 10 (including the second magnetic steel sheet 10B) other than the first magnetic steel sheet 10A is located at the same position in the radial direction as the end 93 of the abutting portion 90 of the housing 9. At this time, the temperature of the rotating electric machine 1 is normal temperature (for example, 20 degrees celsius).
Next, as shown in fig. 6 (b), when the rotating electric machine 1 is in a high load state, the temperature of the rotating electric machine 1 rises to become a high temperature (for example, 150 degrees celsius). In this way, the case 9 and the electromagnetic steel plates 10 constituting the stator core 6 are thermally expanded, but the contact portion 90 of the case 9 having a large linear expansion coefficient is expanded more than the electromagnetic steel plates 10.
At this time, since the coefficient of friction between the contact portion 90 of the housing 9 and the first electromagnetic steel sheet 10A, that is, the coefficient of friction between aluminum and resin is larger than the coefficient of friction between the first electromagnetic steel sheet 10A and the second electromagnetic steel sheet 10B, that is, the coefficient of friction between resin and resin, the first electromagnetic steel sheet 10A is pulled radially outward by the frictional force between the contact portion 90 of the housing 9 and the contact portion 90. However, the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A is displaced radially outward, but is positioned radially inward of the outer peripheral edge 42B of the second electrical steel sheet 10B, and therefore does not protrude radially outward of the outer peripheral edge 42B of the second electrical steel sheet 10B. Thus, the first electrical steel sheet 10A is not deformed such that the outer peripheral edge 42A is warped toward the second electrical steel sheet 10B side by the axial force AR of the fastening member 8.
Here, the friction coefficient is a coefficient indicating the difficulty of sliding between the contact surfaces of two objects in contact with each other, and the larger the friction coefficient is, the more difficult it is to slide between the contact surfaces of two objects in contact with each other.
Next, as shown in fig. 6 (c), when the rotating electric machine 1 changes from the high load state to the low load state or the no-load state, the temperature of the rotating electric machine 1 decreases. In this way, although both the case 9 and the electromagnetic steel plates 10 constituting the stator core 6 contract, the contact portion 90 of the case 9 having a large linear expansion coefficient contracts more than the electromagnetic steel plates 10.
At this time, since the friction coefficient between the contact portion 90 of the housing 9 and the first electromagnetic steel plate 10A is larger than the friction coefficient between the first electromagnetic steel plate 10A and the second electromagnetic steel plate 10B, the first electromagnetic steel plate 10A is pulled radially inward by the friction force between the contact portion 90 of the housing 9 and the first electromagnetic steel plate. Since the first magnetic steel sheet 10A does not warp toward the second magnetic steel sheet 10B, the first magnetic steel sheet 10A is not caught by the second magnetic steel sheet 10B, and the first magnetic steel sheet 10A is pulled radially inward by a frictional force between the first magnetic steel sheet and the contact portion 90 of the housing 9.
As a result, as shown in fig. 6 (d), when the temperature of the rotating electric machine 1 decreases and returns to the normal temperature, both the case 9 and the magnetic steel sheets 10 constituting the stator core 6 contract, and the first magnetic steel sheet 10A returns to the same position as that of fig. 6 (a) without being caught on the second magnetic steel sheet 10B.
In the processes of fig. 6 (a) to (d), since the friction coefficient between the abutting portion 90 of the housing 9 and the first electromagnetic steel plate 10A, that is, the friction coefficient between aluminum and resin is larger than the friction coefficient between the first electromagnetic steel plate 10A and the second electromagnetic steel plate 10B, that is, the friction coefficient between resin and resin, sliding hardly occurs between the abutting portion 90 of the housing 9 and the first electromagnetic steel plate 10A.
In this way, since the outer peripheral edge 42A of the fastening portion 40A of the first electromagnetic steel sheet 10A that is in contact with the contact portion 90 of the housing 9 is formed radially inward of the outer peripheral edge 42B of the fastening portion 40B of the second electromagnetic steel sheet 10B adjacent to the first electromagnetic steel sheet 10A, even when the housing 9 expands more than the stator core 6 due to an increase in temperature of the rotating electrical machine 1 and the first electromagnetic steel sheet 10A is pulled radially outward by the frictional force of the first electromagnetic steel sheet 10A with the contact portion 90 of the housing 9, the fastening portion 40A of the first electromagnetic steel sheet 10A does not protrude radially outward of the outer peripheral edge 42B of the fastening portion 40B of the second electromagnetic steel sheet 10B.
Therefore, since the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A is not deformed to warp toward the second electrical steel sheet 10B by the axial force AR of the fastening member 8, the first electrical steel sheet 10A can be returned to the original position without being caught by the second electrical steel sheet 10B when the temperature of the rotating electrical machine 1 is increased and returned to the normal temperature. Accordingly, even when the temperature of the rotating electrical machine 1 is raised and then returned to normal temperature, the insulating member 7B can be prevented from being damaged by the flange portions 31 of the tooth portions 30 of the first electromagnetic steel sheet 10A and the coil 7 can be prevented from being short-circuited, because the first electromagnetic steel sheet 10A does not return to the original position.
The shape of the first magnetic steel sheet 10A radially inward of the fastening portion 40A, that is, the shapes of the yoke portion 20 and the tooth portion 30 of the first magnetic steel sheet 10A are the same as those of the other magnetic steel sheets 10 (including the second magnetic steel sheet 10B). Therefore, the magnetic flux generated in the first electromagnetic steel sheet 10A by the driving of the rotating electrical machine 1 does not change from the magnetic flux generated in the other electromagnetic steel sheets 10 (including the second electromagnetic steel sheet 10B), and therefore, the output torque of the rotating electrical machine 1 can be prevented from being reduced.
In the present embodiment, the insulating member 7B is insulating paper, but the insulating member 7B may be an insulating coating film covering the outer peripheral surface of the slot coil portion 7A. This can facilitate the work of inserting the plurality of slot coil portions 7A into the slot portions 39.
[ second embodiment ]
Next, a rotating electrical machine 1A according to a second embodiment of the present invention will be described with reference to fig. 7 and 8. In the following description, the same components as those of the rotating electric machine 1 according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified. In the electromagnetic steel plates 10 constituting the stator core 6 of the rotating electrical machine 1 in the first embodiment, only the first electromagnetic steel plate 10A that abuts against the abutting portion 90 of the housing 9 in the axial direction has a shape different from the other electromagnetic steel plates 10, but in the electromagnetic steel plates 10 constituting the stator core 6 of the rotating electrical machine 1A in the second embodiment, all the electromagnetic steel plates 10 including the first electromagnetic steel plate 10A and the second electromagnetic steel plate 10B have the same shape. Hereinafter, differences between the rotating electric machine 1 according to the first embodiment and the rotating electric machine 1A according to the second embodiment will be described in detail.
As shown in fig. 7, the outer peripheral edge 42 of the fastening portion 40 of the electromagnetic steel plates 10 constituting the stator core 6 of the rotating electrical machine 1A in the second embodiment forms a single plane in the radial direction.
The housing 9 of the rotating electric machine 1A has an abutting portion 90A, and the abutting portion 90A abuts against the stator core 6 and forms a fastening hole 91 to which the fastening member 8 is fastened.
In the present embodiment, the abutting portion 90A of the housing 9 is formed radially inward of the outer peripheral edge 42A of the fastening portion 40A of the first electromagnetic steel sheet 10A, which abuts against the abutting portion 90A of the housing 9, of the electromagnetic steel sheets 10 constituting the stator core 6.
The operation of the stator core 6 and the housing 9 due to a temperature change of the rotating electric machine 1A will be described with reference to fig. 8.
As shown in fig. 8 (a) to (d), the stator core 6 is fixed to the contact portion 90A of the housing 9 by the axial force AR of the fastening member 8. The axial force AR of the fastening member 8 is a force in a direction parallel to the central axis C.
First, as shown in fig. 8 (a), an end 93A of the abutting portion 90A of the housing 9 is formed radially inward of an outer peripheral edge 42A of the fastening portion 40A of the first magnetic steel sheet 10A abutting against the abutting portion 90A of the housing 9 and an outer peripheral edge 42B of the fastening portion 40B of the second magnetic steel sheet 10B adjacent to the first magnetic steel sheet 10A. At this time, the temperature of the rotating electric machine 1A is normal temperature (for example, 20 degrees celsius).
Next, as shown in fig. 8 (b), when the rotating electric machine 1A becomes a high load state, the temperature of the rotating electric machine 1A rises to become a high temperature (for example, 150 degrees celsius). In this way, the case 9 and the electromagnetic steel plates 10 constituting the stator core 6 are thermally expanded, but the contact portion 90A of the case 9 having a large linear expansion coefficient is expanded more than the electromagnetic steel plates 10.
At this time, since the friction coefficient between the contact portion 90A of the housing 9 and the first electromagnetic steel sheet 10A, that is, the friction coefficient between aluminum and resin is larger than the friction coefficient between the first electromagnetic steel sheet 10A and the second electromagnetic steel sheet 10B, that is, the friction coefficient between resin and resin, the first electromagnetic steel sheet 10A is pulled radially outward by the friction force between the contact portion 90A of the housing 9 and the first electromagnetic steel sheet. As a result, the outer peripheral edge 42A of the fastening portion 40A of the first electrical steel sheet 10A protrudes radially outward beyond the outer peripheral edge 42B of the fastening portion 40B of the second electrical steel sheet 10B adjacent to the first electrical steel sheet 10A. On the other hand, end 93A of case 9 abutting against portion 90A does not protrude radially outward beyond outer peripheral edge 42B of fastening portion 40B of second electrical steel sheet 10B.
Therefore, the protruding portion 45A of the fastening portion 40A of the first electrical steel sheet 10A that protrudes radially outward from the outer peripheral edge 42B of the fastening portion 40B of the second electrical steel sheet 10B does not abut on any of the abutting portion 90A of the housing 9 and the second electrical steel sheet 10B. Therefore, no load is input to the protruding portion 45A of the fastening portion 40A of the first electromagnetic steel sheet 10A due to the axial force AR from the fastening member 8 of the abutting portion 90A of the housing 9. Thus, the protruding portion 45A of the fastening portion 40A of the first magnetic steel sheet 10A is not deformed to warp toward the second magnetic steel sheet 10B.
Next, as shown in fig. 8 (c), when the rotating electric machine 1A changes from the high load state to the low load state or the no-load state, the temperature of the rotating electric machine 1A decreases. In this way, although both the case 9 and the electromagnetic steel plates 10 constituting the stator core 6 contract, the contact portion 90A of the case 9 having a large linear expansion coefficient contracts more than the electromagnetic steel plates 10.
At this time, since the friction coefficient between the contact portion 90A of the housing 9 and the first electromagnetic steel plate 10A is larger than the friction coefficient between the first electromagnetic steel plate 10A and the second electromagnetic steel plate 10B, the first electromagnetic steel plate 10A is pulled radially inward by the friction force between the contact portion 90A of the housing 9 and the first electromagnetic steel plate. Further, since the first magnetic steel sheet 10A does not warp toward the second magnetic steel sheet 10B, the first magnetic steel sheet 10A is not caught by the second magnetic steel sheet 10B, and the first magnetic steel sheet 10A is pulled radially inward by a frictional force between the first magnetic steel sheet and the contact portion 90A of the housing 9.
As a result, as shown in fig. 8 (d), when the temperature of the rotating electric machine 1A decreases and returns to the normal temperature, the electromagnetic steel sheets constituting the stator core 6 and the case 9 both contract, and the first electromagnetic steel sheet 10A returns to the same position as in fig. 8 (a) without being caught on the second electromagnetic steel sheet 10B.
In the processes of fig. 8 (a) to (d), since the friction coefficient between the abutment portion 90A of the housing 9 and the first electromagnetic steel plate 10A, that is, the friction coefficient between aluminum and resin is larger than the friction coefficient between the first electromagnetic steel plate 10A and the second electromagnetic steel plate 10B, that is, the friction coefficient between resin and resin, sliding hardly occurs between the abutment portion 90A of the housing 9 and the first electromagnetic steel plate 10A.
In this way, since the abutting portion 90A of the housing 9 is formed radially inward of the outer peripheral edge 42A of the fastening portion 40A of the first electromagnetic steel plate 10A abutting against the abutting portion 90A of the housing 9 and the outer peripheral edge 42B of the fastening portion 40B of the second electromagnetic steel plate 10B adjacent to the first electromagnetic steel plate 10A, even when the housing 9 expands more than the stator core 6 due to a temperature rise of the rotating electrical machine 1A and the first electromagnetic steel plate 10A is pulled radially outward by a frictional force between the first electromagnetic steel plate 10A and the abutting portion 90A of the housing 9, the protruding portion 45A of the fastening portion 40A of the first electromagnetic steel plate 10A does not abut against either one of the abutting portion 90A of the housing 9 and the second electromagnetic steel plate 10B.
Therefore, no load is input to the protruding portion 45A of the fastening portion 40A of the first electromagnetic steel sheet 10A due to the axial force AR from the fastening member 8 of the abutting portion 90A of the housing 9. Therefore, the protruding portion 45A of the fastening portion 40A of the first electromagnetic steel sheet 10A is not affected by the axial force AR of the fastening member 8, and deformation such as warping toward the second electromagnetic steel sheet 10B does not occur, and therefore, when the temperature of the rotating electrical machine 1A is increased and then returned to normal temperature, the first electromagnetic steel sheet 10A can be returned to the original position without being caught by the second electromagnetic steel sheet 10B. This prevents the flange portions 31 of the tooth portions 30 of the first electromagnetic steel sheet 10A from damaging the insulating member 7B and also prevents the coil 7 from being short-circuited, without the first electromagnetic steel sheet 10A returning to its original position due to a temperature change of the rotating electric machine 1A.
The shape of the first electromagnetic steel sheet 10A is the same as the shape of the other electromagnetic steel sheets 10. Therefore, the magnetic flux generated in the first electromagnetic steel sheet 10A and the magnetic flux generated in the other electromagnetic steel sheets 10 do not change, and therefore, the output torque of the rotating electrical machine 1A can be prevented from being reduced.
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be appropriately made.
In the present specification, at least the following matters are described. In addition, although the corresponding components and the like in the above-described embodiments are shown in parentheses, the present invention is not limited to these.
(1) A rotating electrical machine (rotating electrical machine 1) is provided with:
a stator (stator 5) having a substantially annular stator core (stator core 6) and a coil (coil 7) attached to the stator core, the stator core (stator core 6) having a plurality of slot portions (slot portions 39);
a housing (housing 9) formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member (fastening member 8) that fixes the stator to the housing,
the coil has a plurality of slot coil portions (slot coil portions 7A) inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member (insulating member 7B),
the stator core is formed of a plurality of stacked electromagnetic steel plates (electromagnetic steel plates 10), and has a fastening portion (fastening portion 40) that protrudes radially outward and is formed with a through hole (through hole 41) through which the fastening member passes,
the housing has an abutting portion (abutting portion 90) abutting against the stator core and formed with a fastening hole (fastening hole 91) to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
an outer peripheral edge (outer peripheral edge 42A) of the fastening portion (fastening portion 40A) of a first electromagnetic steel sheet (first electromagnetic steel sheet 10A) of the plurality of electromagnetic steel sheets that is in contact with the case is formed radially inward of an outer peripheral edge (outer peripheral edge 42B) of the fastening portion (fastening portion 40B) of a second electromagnetic steel sheet (second electromagnetic steel sheet 10B) adjacent to the first electromagnetic steel sheet.
According to (1), since the outer peripheral edge of the fastening portion of the first electromagnetic steel sheet abutting against the housing is formed radially inward of the outer peripheral edge of the fastening portion of the second electromagnetic steel sheet adjacent to the first electromagnetic steel sheet, even when the housing expands more than the stator core as the temperature of the rotating electrical machine increases and the first electromagnetic steel sheet deforms radially outward by the frictional force between the first electromagnetic steel sheet and the housing, the fastening portion of the first electromagnetic steel sheet does not protrude radially outward than the outer peripheral edge of the fastening portion of the second electromagnetic steel sheet. Therefore, the outer peripheral edge of the fastening portion of the first electromagnetic steel sheet can be prevented from warping toward the second electromagnetic steel sheet side due to the axial force of the fastening member. Accordingly, when the temperature of the rotating electrical machine is raised and then returned to normal temperature, the first electromagnetic steel sheet can be returned to the original position without being caught by the second electromagnetic steel sheet, and therefore, damage to the insulating member and short-circuiting of the coil due to the first electromagnetic steel sheet can be prevented.
Further, since the first electrical steel sheet can be formed in the same shape as the second electrical steel sheet radially inward of the fastening portion, a decrease in output torque of the rotating electrical machine can be prevented.
(2) A rotating electrical machine (rotating electrical machine 1A) is provided with:
a stator (stator 5) having a substantially annular stator core (stator core 6) and a coil (coil 7) attached to the stator core, the stator core (stator core 6) having a plurality of slot portions (slot portions 39);
a housing (housing 9) formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member (fastening member 8) that fixes the stator to the housing,
the coil has a plurality of slot coil portions (slot coil portions 7A) inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member (insulating member 7B),
the stator core is formed of a plurality of stacked electromagnetic steel plates (electromagnetic steel plates 10), and has a fastening portion (fastening portion 40) that protrudes radially outward and is formed with a through hole (through hole 41) through which the fastening member passes,
the housing has an abutting portion (abutting portion 90A) abutting against the stator core and formed with a fastening hole (fastening hole 91) to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
the abutting portion of the housing is formed radially inward of an outer peripheral edge (outer peripheral edge 42A) of the fastening portion (fastening portion 40A) of a first electromagnetic steel sheet (first electromagnetic steel sheet 10A) abutting against the housing among the plurality of electromagnetic steel sheets, and an outer peripheral edge (outer peripheral edge 42B) of the fastening portion (fastening portion 40B) of a second electromagnetic steel sheet (second electromagnetic steel sheet 10B) adjacent to the first electromagnetic steel sheet.
According to (2), the abutting portion of the housing is formed radially inward of the outer peripheral edge of the fastening portion of the first electromagnetic steel plate abutting against the housing and the outer peripheral edge of the fastening portion of the second electromagnetic steel plate adjacent to the first electromagnetic steel plate. Therefore, even when the housing expands more than the stator core due to a temperature rise of the rotating electric machine, and the first electromagnetic steel plate deforms radially outward by a frictional force between the first electromagnetic steel plate and the housing, and a portion of the fastening portion of the first electromagnetic steel plate protrudes radially outward beyond the outer peripheral edge of the fastening portion of the second electromagnetic steel plate, it is possible to avoid the contact between the protruding portion of the first electromagnetic steel plate and either the contact portion of the housing or the second electromagnetic steel plate. Thus, the protruding portion of the first electromagnetic steel sheet is not affected by the axial force of the fastening member, and deformation such as warping toward the second electromagnetic steel sheet side does not occur. Accordingly, when the temperature of the rotating electrical machine is raised and then returned to normal temperature, the first electromagnetic steel sheet can be returned to the original position without being caught by the second electromagnetic steel sheet, and therefore, damage to the insulating member and short-circuiting of the coil due to the first electromagnetic steel sheet can be prevented.
(3) The rotary electric machine according to (1) or (2), wherein the insulating member is an insulating paper inserted between the slot coil portions and the adjacent slot coil portions.
According to (3), since the insulating member is an insulating paper inserted between the slot coil portion and the adjacent slot coil portion, the slot coil portion can be easily manufactured.
(4) The rotating electrical machine according to (1) or (2), wherein the insulating member is an insulating coating film that covers an outer peripheral surface of the slot coil portion.
According to (4), since the insulating coating is coated on the outer peripheral surface of the slot coil portion, the work of inserting the plurality of slot coil portions into the slot portion can be facilitated.
Claims (4)
1. A rotating electrical machine is provided with:
a stator having a substantially annular stator core having a plurality of slot portions and a coil attached to the stator core;
a housing formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member that fixes the stator to the housing,
the coil has a plurality of slot coil portions inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member,
the stator core is formed of a plurality of stacked electromagnetic steel plates, and has a fastening portion that protrudes radially outward and is formed with a through-hole through which the fastening member passes,
the housing has an abutting portion abutting against the stator core and formed with a fastening hole to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
an outer peripheral edge of the fastening portion of a first electromagnetic steel plate, which is in contact with the housing, of the plurality of electromagnetic steel plates is formed radially inward of an outer peripheral edge of the fastening portion of a second electromagnetic steel plate adjacent to the first electromagnetic steel plate.
2. A rotating electrical machine is provided with:
a stator having a substantially annular stator core having a plurality of slot portions and a coil attached to the stator core;
a housing formed of a material having a higher linear expansion coefficient than the stator core; and
a fastening member that fixes the stator to the housing,
the coil has a plurality of slot coil portions inserted into the slot portions,
the plurality of slot coil portions are insulated from the adjacent slot coil portions by an insulating member,
the stator core is formed of a plurality of stacked electromagnetic steel plates, and has a fastening portion that protrudes radially outward and is formed with a through-hole through which the fastening member passes,
the housing has an abutting portion abutting against the stator core and formed with a fastening hole to which the fastening member is fastened,
the fastening member passes through the through-hole of the stator core and is fastened to the fastening hole of the case, thereby fixing the stator to the case,
the abutting portion of the housing is formed radially inward of an outer peripheral edge of the fastening portion of a first electromagnetic steel plate abutting against the housing and an outer peripheral edge of the fastening portion of a second electromagnetic steel plate adjacent to the first electromagnetic steel plate, among the plurality of electromagnetic steel plates.
3. The rotating electric machine according to claim 1 or 2,
the insulating member is an insulating paper inserted between the slot coil part and the adjacent slot coil part.
4. The rotating electric machine according to claim 1 or 2,
the insulating member is an insulating coating film covering an outer peripheral surface of the slot coil portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019006056A JP2020115710A (en) | 2019-01-17 | 2019-01-17 | Rotary electric machine |
| JP2019-006056 | 2019-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111446786A true CN111446786A (en) | 2020-07-24 |
| CN111446786B CN111446786B (en) | 2022-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010046002.XA Active CN111446786B (en) | 2019-01-17 | 2020-01-15 | Rotating electrical machine |
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| Country | Link |
|---|---|
| JP (1) | JP2020115710A (en) |
| CN (1) | CN111446786B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020115710A (en) | 2020-07-30 |
| CN111446786B (en) | 2022-10-04 |
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