Rotating electric machine and rotor
阅读说明:本技术 旋转电机以及转子 (Rotating electric machine and rotor ) 是由 栗田聪 坪井雄一 于 2019-07-09 设计创作,主要内容包括:一种旋转电机以及转子,在不使效率降低的情况下确保旋转电机的冷却性能。旋转电机具备:转子,具有转子轴、转子铁心(110)、多个转子导体(16);定子,具有定子铁心和定子绕组;以及两个轴承。在转子铁心形成有多个环状排列贯通孔(111),并且在轴向相互隔开间隔地形成有多个铁心径向通气孔(112),多个环状排列贯通孔具有供转子导体沿轴向贯通的贯通孔导体收纳部(111a)和其径向内侧的贯通孔轴向通气部(111b),多个铁心径向通气孔在上述转子铁心的外周在周向相互隔开间隔地配置,且从环状排列贯通孔通到径向外侧。在多个转子导体的各个,至少在形成有铁心径向通气孔的位置,形成有沿径向贯通转子导体的导体通气孔。(A rotating electrical machine and a rotor that ensure cooling performance of the rotating electrical machine without reducing efficiency. The rotating electric machine is provided with: a rotor having a rotor shaft, a rotor core (110), and a plurality of rotor conductors (16); a stator having a stator core and a stator winding; and two bearings. A plurality of annularly arranged through holes (111) are formed in the rotor core, and a plurality of core radial direction vent holes (112) are formed at intervals in the axial direction, the plurality of annularly arranged through holes have through hole conductor receiving portions (111a) through which the rotor conductors pass in the axial direction and through hole axial direction vent portions (111b) on the radial inner side thereof, and the plurality of core radial direction vent holes are arranged at intervals in the circumferential direction on the outer periphery of the rotor core and pass from the annularly arranged through holes to the radial outer side. At least at the position where the core radial direction vent hole is formed, a conductor vent hole penetrating the rotor conductor in the radial direction is formed in each of the plurality of rotor conductors.)
1. A rotating electrical machine is provided with:
a rotor having: a rotor shaft extending in an axial direction; a rotor core mounted on a radially outer side of the rotor shaft; a plurality of rotor conductors that penetrate the rotor core and are arranged at intervals in the circumferential direction;
a stator having: a cylindrical stator core provided radially outside the rotor core; and a stator winding axially penetrating the stator core; and
two bearings rotatably supporting the rotor shaft on both sides of the rotor core in an axial direction of the rotor shaft,
the above-described rotating electrical machine is characterized in that,
a plurality of annularly arranged through holes are formed in the rotor core, and a plurality of core radial direction ventilation holes are formed at intervals in the axial direction, the plurality of annularly arranged through holes have through hole conductor housing portions through which the plurality of rotor conductors pass in the axial direction, and through hole axial direction ventilation portions on the radially inner side of the through hole conductor housing portions, the plurality of core radial direction ventilation holes are arranged at intervals in the circumferential direction on the outer periphery of the rotor core, and are communicated to the radially outer side from the annularly arranged through holes,
at least one conductor ventilation hole penetrating the rotor conductor in the radial direction is formed in each of the plurality of rotor conductors at least at a position where the core radial direction ventilation hole is formed.
2. The rotating electric machine according to claim 1,
the rotor core includes:
a plurality of first electromagnetic steel sheets in a circular plate shape, which are stacked in an axial direction and are formed with: a plurality of first steel plate openings arranged in a ring shape, each of the first steel plate openings having a first steel plate opening conductor housing portion forming the through-hole conductor housing portion and a first steel plate opening axial ventilation portion forming the through-hole axial ventilation portion; and a radial ventilation slit for forming the radial ventilation hole of the iron core; and
a plurality of second electromagnetic steel plates each having a disk shape and being stacked in an axial direction, and having a plurality of second steel plate openings arranged in an annular shape, the plurality of second steel plate openings having a second steel plate opening conductor housing portion forming the through-hole conductor housing portion and a second steel plate opening axial ventilation portion forming the through-hole axial ventilation portion,
the first steel plate groups each having the plurality of first magnetic steel plates stacked in the axial direction and the second steel plate groups each having the plurality of second magnetic steel plates stacked in the axial direction are alternately arranged in the axial direction.
3. The rotating electric machine according to claim 1 or 2,
the conductor ventilation holes of each of the plurality of rotor conductors are formed at axial positions corresponding to ranges in which the core radial ventilation holes are formed.
4. The rotating electric machine according to claim 3,
each of the plurality of rotor conductors is provided with a stopper portion for positioning the conductor ventilation hole so as to be an axial position of the core radial direction ventilation hole.
5. The rotating electric machine according to claim 1 or 2,
the conductor ventilation holes of each of the plurality of rotor conductors are formed continuously in the longitudinal direction in a range including a plurality of ranges in which the core radial direction ventilation holes are formed.
6. A rotor of a rotating electrical machine, the rotating electrical machine comprising: a stator having a cylindrical stator core and a stator winding axially penetrating the stator core; and two bearings, said rotor being characterized in that,
comprising:
a rotor shaft extending in the direction of the rotation axis and rotatably supported by the two bearings;
a rotor core disposed radially inside the stator core and attached radially outside the rotor shaft; and
a plurality of rotor conductors arranged so as to penetrate through the rotor core and so as to be spaced apart from each other in the circumferential direction,
a plurality of annularly arranged through holes are formed in the rotor core, and a plurality of core radial direction ventilation holes are formed at intervals in the axial direction, the plurality of annularly arranged through holes have through hole conductor housing portions through which the plurality of rotor conductors pass in the axial direction, and through hole axial direction ventilation portions on the radially inner side of the through hole conductor housing portions, the plurality of core radial direction ventilation holes are arranged at intervals in the circumferential direction on the outer periphery of the rotor core, and are communicated to the radially outer side from the annularly arranged through holes,
at least at the position where the core radial direction vent hole is formed, a conductor vent hole penetrating the rotor conductor in the radial direction is formed in each of the plurality of rotor conductors.
Technical Field
The present invention relates to a rotating electric machine and a rotor thereof.
Background
In a rotor core and a stator core of a rotating electrical machine, iron loss due to eddy current or the like generated during operation is one cause of heat generation, and is a significant cause of a decrease in efficiency. Therefore, reducing the flow of eddy current in each of the rotor core and the stator core is effective in ensuring the efficiency of the rotating electric machine.
Therefore, in a rotor core and a stator core of a rotating electrical machine, a laminated structure in which disk-shaped electromagnetic steel plates made of ferromagnetic material and having an opening at the center are laminated in the axial direction is generally used. For example, silicon steel sheets having a relatively high magnetic permeability and low cost are used as the electrical steel sheets.
In the case of a cage type induction motor, a current flows through rotor conductor bars penetrating the rotor by an induced electromotive force generated by an alternating current flowing through a stator winding. In the case of a synchronous rotating electrical machine, a current flows through a rotor winding by electric power supplied from the outside. Further, a stator core is provided which is disposed outside the rotor core in the radial direction so as to surround the rotor core with a gap therebetween, and a current flows through a stator winding which penetrates the stator core in the axial direction due to power supplied from the outside.
Generally, the rotor core and the stator are housed in a frame. In the frame, a cooling gas is circulated to cool the rotor core, the rotor conductor bar, or the rotor winding, the stator core, the stator winding, and the like. In many rotating electrical machines, a cooler is generally provided, and a cooling gas is cooled in the cooler, and the cooled cooling gas cools the rotor and the stator.
Patent document 1: japanese patent laid-open publication No. 158398 (Japanese patent application laid-open publication No. 2017)
Patent document 2: japanese patent laid-open publication No. 2017-184529
The rotor windings are in mechanical contact or bonded with the plurality of components. However, insulation needs to be maintained electrically. Therefore, a plurality of insulating materials are used for the rotor coil, the rotor conductor bar, and the components around them.
The insulating material has a limitation in heat resistance depending on the material thereof and the like at the use temperature. On the other hand, with the recent increase in the unit capacity of the rotating electric machine, the current density in the rotor coil tends to increase. Therefore, it is important to cool each part of the rotor, including the rotor winding. Also, cooling of the stator is important in each part as well.
There are examples where the gap, i.e. the channel, between the rotor cores is arranged in the axial direction. A cooling gas for the rotor such as air flows through an axial flow passage formed between the rotor core and the rotor shaft, and is converted in direction to flow radially outward in the passage (see patent document 1). In this case, it is important to reduce the pressure loss due to the flow of the cooling gas. In the case where the rotor is cooled by the formation of the channels, the more the number of the channels formed in the axial direction increases, the more the gap in which the magnetic resistance in the axial direction is large increases, and therefore, this is not preferable in terms of electromagnetic performance. This also causes an increase in the axial length.
For example, in a rotor having an open groove shape, that is, grooves formed continuously in the axial direction, there is known an example in which an axial flow path is provided on the radially inner side of a rotor conductor bar and a radial flow path is provided on the rotor conductor bar, thereby improving the cooling effect by the cooling gas (see patent document 2). In the case of the open groove shape, a centrifugal force applied to the rotor coil or the rotor bar due to an increase in the rotation speed becomes a problem. Further, the occurrence of a portion where the outer peripheral surface of the rotor core is not a complete cylindrical surface increases wind loss, which becomes a factor of reducing efficiency.
Disclosure of Invention
Therefore, an object of the present invention is to ensure cooling performance of a rotating electric machine and improve efficiency.
In order to achieve the above object, the present invention provides a rotating electric machine including a rotor, a stator, and two bearings, wherein the rotor includes: a rotor shaft extending in an axial direction; a rotor core mounted on a radially outer side of the rotor shaft; and a plurality of rotor conductors that penetrate through the rotor core and are arranged at intervals in the circumferential direction, wherein the stator includes: a cylindrical stator core provided radially outside the rotor core; and a stator winding axially penetrating the stator core, wherein the two bearings rotatably support the rotor shaft on both sides of the rotor core in the axial direction of the rotor shaft with the rotor core interposed therebetween, wherein the rotor core is provided with a plurality of annularly arranged through holes having a through hole conductor housing portion through which each of the plurality of rotor conductors axially penetrates and a through hole axial ventilation portion on a radially inner side of the through hole conductor housing portion, and wherein the plurality of core radial ventilation holes are arranged on an outer periphery of the rotor core at intervals in a circumferential direction and pass through the annularly arranged through holes to a radially outer side, and wherein the plurality of rotor conductors are each provided at least at a position where the core radial ventilation hole is formed, conductor vent holes penetrating the rotor conductor in the radial direction are formed.
Further, the present invention provides a rotor for a rotating electrical machine, the rotating electrical machine including: a stator having a cylindrical stator core and a stator winding axially penetrating the stator core; and two bearings, the rotor comprising: a rotor shaft extending in the direction of the rotation axis and rotatably supported by the two bearings; a rotor core disposed radially inside the stator core and attached radially outside the rotor shaft; and a plurality of rotor conductors which penetrate through the rotor core and are arranged at intervals in the circumferential direction, wherein the rotor core is provided with a plurality of annularly arranged through holes, and a plurality of core radial direction ventilation holes are formed at intervals in the axial direction, the plurality of annularly arranged through holes have through hole conductor accommodating portions through which the plurality of rotor conductors penetrate in the axial direction, and through hole axial direction ventilation portions on the radial inner side of the through hole conductor accommodating portions, the plurality of core radial direction ventilation holes are arranged at intervals in the circumferential direction on the outer periphery of the rotor core, and pass through the annularly arranged through holes to the radial outer side, and conductor ventilation holes which penetrate the rotor conductors in the radial direction are formed at least at positions where the core radial direction ventilation holes are formed in each of the plurality of rotor conductors.
Effects of the invention
According to the present invention, the cooling performance of the rotating electric machine can be ensured and the efficiency can be improved.
Drawings
Fig. 1 is a vertical sectional view showing a structure of a rotating electric machine according to a first embodiment.
Fig. 2 is a perspective view illustrating a rotor conductor of the rotating electric machine according to the first embodiment.
Fig. 3 is a sectional view of the line III-III in fig. 4 showing the rotor conductor of the rotating electric machine according to the first embodiment.
Fig. 4 is a cross-sectional view taken along line IV-IV in fig. 3, showing a rotor conductor of the rotating electric machine according to the first embodiment.
Fig. 5 is a perspective view illustrating a rotor core of a rotating electric machine according to a first embodiment.
Fig. 6 is a cross-sectional view of the rotor core of the rotating electric machine according to the first embodiment, as viewed in the direction of the rotation axis in a portion of the first group of steel plates.
Fig. 7 is a cross-sectional view of the rotor core of the rotating electric machine according to the first embodiment, as viewed in the direction of the rotation axis in a portion of the second group of steel plates.
Fig. 8 is a perspective view illustrating a rotor conductor of a rotating electric machine according to a second embodiment.
Fig. 9 is a cross-sectional view of the rotor core of the rotating electric machine according to the second embodiment, as viewed in the direction of the rotation axis in a portion of the first set of steel plates.
Fig. 10 is a cross-sectional view of the rotor core of the rotating electric machine according to the second embodiment, as viewed in the direction of the rotation axis at the portion of the second group of steel plates.
Description of the reference numerals
10 rotor, 11 rotor shaft, 15 short-circuiting ring, 16 rotor conductor, 16a conductor vent hole, 16b stopper, 16c inlet taper, 16d outlet taper, 17 rotor conductor, 17a conductor vent hole, 18 inner fan, 19 gap, 20 stator, 21 stator core, 21a stator channel, 22 stator winding, 30 bearing, 40 frame, 40a closed space, 45 bearing holder, 60 cooler, 61 cooling pipe, 62 cooler cover, 63 cooler inlet opening, 64 cooler outlet opening, 110 rotor core, 111 annularly arranged through hole, 111a through hole conductor receiver, 111b through hole axial vent, 112 core radial vent hole, 120 first electromagnetic steel plate, 120g first steel plate group, 121 first steel plate annularly arranged opening, 121a first steel plate opening conductor receiver, 121b … first steel plate open axial ventilation portion, 122 … radial ventilation notch, 130 … second steel plate, 130g … second steel plate group, 131 … second steel plate annular array opening, 131a … second steel plate open conductor storage portion, 131b … second steel plate open axial ventilation portion, 200 … rotating electrical machine
Detailed Description
A rotating electric machine and a rotor thereof according to the present invention will be described below with reference to the drawings. Here, the same or similar portions are given the same reference numerals and the overlapping description is omitted.
[ first embodiment ]
Fig. 1 is a vertical sectional view showing a structure of a rotating electric machine according to a first embodiment.
The rotating electrical machine 200 includes a rotor 10, a stator 20, two bearings 30, a frame 40, two bearing holders 45, and a cooler 60.
The rotor 10 includes a rotor shaft 11 extending in a horizontal rotation axis direction, a
The
The plurality of
As shown in fig. 1, the inner fan 18 is provided between one of the bearings 30 and the
The stator 20 includes a stator core 21 and a stator winding 22. The stator core 21 is cylindrical and disposed radially outward of the
A frame 40 is provided radially outward of the stator 20, and the frame 40 houses the
A cooler 60 is provided on the upper side of the frame 40. The cooler 60 has at least 1 cooling tube 61 and a cooler cover 62 that houses the cooling tube 61. The cooler cover 62 forms a closed space 40a containing cooling gas in cooperation with the frame 40 and the bearing holder 45. The space inside the cooler cover 62 and the space inside the frame 40 communicate via a cooler inlet opening 63 and a cooler outlet opening 64.
Fig. 2 is a perspective view illustrating a rotor conductor of the rotating electric machine according to the first embodiment. The
The
A
Fig. 3 is a sectional view of the line III-III in fig. 4 showing the rotor conductor of the rotating electric machine according to the first embodiment. Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 3.
An inlet tapered
Fig. 5 is a perspective view illustrating a rotor core of a rotating electric machine according to a first embodiment.
The plurality of first
The annularly arranged through-
Fig. 6 is a cross-sectional view of the rotor core viewed in the direction of the rotation axis at a portion of the first set of steel plates.
A plurality of first steel plate ring-shaped aligned
Radially outward of the first steel plate annular array opening 121, a radial ventilation slit 122 communicating with the outer side of the outer periphery is formed continuously with the first steel plate
Fig. 7 is a cross-sectional view of the rotor core viewed in the direction of the rotation axis at a portion of the second group of steel plates. Fig. 7 shows the second
A plurality of second steel plate ring-shaped aligned
The second steel plate annularly arranged
The radial ventilation slits 122 formed in the first
As described with reference to fig. 5, the first
The through-hole
As shown in fig. 5, in an axial region where the first
Therefore, the axial length of the core radial
The rotating electric machine according to the present embodiment configured as described above has the following operations and effects.
First, the cooling effect of the
Second, the range in which the second
Thirdly, since the core radial direction ventilation holes 112 are formed only in a part of the outer periphery of the
As described above, according to the present embodiment, the cooling performance of the rotating electric machine can be ensured while maintaining the performance.
[ second embodiment ]
The second embodiment is a modification of the first embodiment. In the second embodiment, a
Fig. 8 is a perspective view illustrating a rotor conductor of a rotating electric machine according to a second embodiment.
In the present embodiment, a first
The
As a result, a portion for positioning in the axial direction, such as the
Fig. 9 is a cross-sectional view of the rotor core viewed in the direction of the rotation axis at a portion of the first set of steel plates. Fig. 10 is a cross-sectional view of the rotor core viewed in the direction of the rotation axis at a portion of the second group of steel plates.
As shown in fig. 9 and 10, the
As described above, in the present embodiment, when the
In addition, as a modification of the present embodiment, the number of the
[ other embodiments ]
The embodiments of the present invention have been described above, but the embodiments are presented only as examples and are not intended to limit the scope of the invention. For example, in the embodiment, the case where the rotor shaft extends horizontally is shown as an example, but the invention is not limited thereto. For example, the rotor shaft may extend in the vertical direction.
The embodiments may be implemented in other various forms, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention. The embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.
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