CN110994906B

CN110994906B - Brushless rotating electric machine

Info

Publication number: CN110994906B
Application number: CN201910937510.4A
Authority: CN
Inventors: 岩永康太
Original assignee: Toshiba Mitsubishi Electric Industrial Systems Corp
Current assignee: Toshiba Mitsubishi Electric Industrial Systems Corp
Priority date: 2018-10-03
Filing date: 2019-09-30
Publication date: 2022-10-25
Anticipated expiration: 2039-09-30
Also published as: CN110994906A; JP2020058165A

Abstract

In a brushless rotating electrical machine, the cooling performance of an excitation device is ensured while suppressing the influence of an increase in the arrangement space and the like on a rotating rectifier. A brushless rotating electric machine is provided with: a main rotor having a main rotor shaft and a main rotor core; a main stator having a main stator core and a main stator coil; an exciter having an exciter rotor shaft, a rotating rectifier, and an exciter having an exciter rotor and an exciter stator; a frame; a cooler; a cooler cover; an excitation device cover which is internally provided with an excitation device and is communicated with the cooler cover and the frame; and an inner fan. A plurality of inclined parts (118 a) for stirring the cooling gas in the exciter cover are formed continuously in the circumferential direction on the outer surface in the radial direction of the rotating commutator.

Description

Brushless rotating electric machine

Technical Field

The present invention relates to a brushless rotating electrical machine having a rotating rectifier.

Background

In a synchronous rotating electrical machine, normally, an armature winding is provided on a stator side, and a field winding is provided on a rotor side. The dc power to the field winding provided in the rotor is usually supplied from a rectifier provided on the stationary side via a brush. Since the brush needs maintenance and replacement, a brushless system is known in which a rotating commutator that rotates together with a rotor is provided in order to eliminate the need for the brush.

Documents of the prior art

Patent literature

Patent document 1: japanese Kokai publication Sho 63-156559

Patent document 2: japanese Kokai publication Sho 63-21472

In the case where the cooling effect from the outside is large with respect to the heat generation of the rectifier, the rectifier can be downsized, and therefore, for example, a method of providing a cooling fan attached to the rotor shaft in the vicinity of the rectifier is known (patent document 1). In this case, a space for installing the cooling fan in the axial direction of the rotor shaft is required.

Further, there is known a method of opposing the rectifier and the cooling fan with a retaining ring of the rectifier interposed therebetween in the axial direction (patent document 2). In this case, since a configuration in which 2 rectifiers face each other is not adopted, when a necessary number of rectifiers are provided, there is an influence on the arrangement such as an increase in the arrangement space.

Disclosure of Invention

Therefore, an object of the present invention is to ensure cooling performance of an excitation device while suppressing an influence of an increase in an arrangement space or the like on a rotating rectifier in a brushless rotating electrical machine having the rotating rectifier.

In order to achieve the above object, a brushless rotating electrical machine according to the present invention includes: a main rotor having: a main rotor shaft that is supported so as to be rotatable and extends in an axial direction, and a main rotor core that is fixed to a radially outer side of the main rotor shaft and extends in the axial direction; a main stator having: a main stator core disposed radially outward of the main rotor core and extending in an axial direction; and a main stator coil wound around the main stator core; an excitation device is provided with: an excitation device rotor shaft coupled to an axial end of the main rotor shaft and extending in an axial direction; a rotating commutator rotating together with the rotor shaft of the excitation device; and an exciter, wherein the exciter comprises: an exciter rotor that rotates together with the exciter rotor shaft; and an exciter stator disposed radially outward of the exciter rotor so as to face the exciter rotor, and fixedly supported radially outward of the exciter rotor; a frame that houses the main rotor core and the main stator; a cooler for cooling a cooling gas, which cools the main stator and the main rotor core in the frame, as a fluid on a cooling side outside the tube; a cooler cover which is attached to an upper portion of the frame, forms a closed space together with the frame, houses the cooler, and communicates with the frame through a cooler inlet opening for inflow from the frame and a cooler outlet opening for outflow into the frame; an excitation device cover in which the excitation device is built, the excitation device cover being in communication with the cooler cover and the frame; and an inner fan attached to the main rotor shaft and circulating the cooling gas in the closed space, wherein a plurality of inclined portions are continuously formed in a circumferential direction on an outer surface in a radial direction of the rotating commutator, and the plurality of inclined portions stir the cooling gas in the exciter cover.

Effects of the invention

According to the present invention, in a brushless rotating electrical machine having a rotating rectifier, it is possible to secure cooling performance of an excitation device while suppressing an influence of an increase in an arrangement space or the like on the rotating rectifier.

Drawings

Fig. 1 is a longitudinal sectional view of a brushless electric motor according to embodiment 1.

Fig. 2 is a quarter cross-sectional view looking along line II-II of fig. 1.

Fig. 3 is a perspective view of a ring-shaped member of a rotating rectifier in the brushless rotating electric machine according to embodiment 1.

Fig. 4 is a perspective view of a ring member of the rotating rectifier in the brushless rotating electric machine according to embodiment 2.

Description of the symbols

10 '\ 8230, a main rotor, 11' \ 8230, a main rotor shaft, 11a '\ 8230, a field device rotor shaft, 12' \ 8230, a main rotor core, 15 '\ 8230, an inner fan, 20' \ 8230, a main stator, 21 '\ 8230, a main stator core, 22' \ 8230, a main stator coil, 41 '\ 8230, a connecting side bearing, 42' \ 8230, a field device side bearing, 51 '\ 8230, a frame, 51 a' \ 8230, a cooler inlet opening, 51b '\\ 8230, a cooler outlet opening, 51c, 51 d' \\\ 8230, a partition board, 52 '\ 8230, a connecting side bearing bracket, 53' \\ 8230, a field device side bearing bracket, 61 '\ 8230, a cooler, a cooling cover, 63' \\ 8230, a field device cover, 64 '\ 8230, an inlet pipe, an inlet opening, an 823065', 65a \8230, an excitation device outlet opening 70 \8230, a closed space 71 \8230, a frame central part 72 \8230, a fan outlet part 73 \8230, a cooler cover part 74 \8230, a frame inlet part 75 \8230, an excitation device cover part 100 \8230, an excitation device 110 \8230, a rotary rectifier 111 \8230, a rectifying element 112 \8230, a heat dissipation part 113 \8230, a connecting part, 114 \8230, fastening part 115 \8230, support part 115a \8230, support part opening 116 \8230, ring part 117 \8230, central part 118 \8230, stirring part 118a \8230, inclined part 119 \8230, ring part 119a \8230, inclined part 120 \8230, exciter 121 \8230, exciter rotor 122 \8230, exciter stator 200 \8230, brushless rotary motor

Detailed Description

A brushless rotating electric machine according to an embodiment of 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 overlapping description is omitted.

[ embodiment 1 ]

Fig. 1 is a longitudinal sectional view of a brushless electric motor according to embodiment 1. Brushless rotating electrical machine 200 includes main rotor 10, main stator 20, coupling-side bearing 41, exciter-side bearing 42, exciter 100, and cooler 61.

The main rotor 10 includes a main rotor shaft 11 and a radial main rotor core 12 attached to the main rotor shaft 11. The main rotor shaft 11 extends horizontally in the axial direction and is rotatably supported by a coupling-side bearing 41 and an exciter-side bearing 42.

The main rotor core 12 has a laminated structure in which disk-shaped steel plates made of ferromagnetic material and having an opening at the center are laminated in the axial direction. An excitation coil, not shown, is provided on the main rotor core 12. An inner fan 15 is mounted on the main rotor shaft 11.

The main stator 20 is cylindrical and is provided radially outside the main rotor 10 and extends in the axial direction. The main stator 20 includes a main stator core 21 and a main stator coil 22. The main stator core 21 is a laminated structure in which disk-shaped steel plates having an opening at the center are laminated in the axial direction and are made of a ferromagnetic material. On the inner side of the main stator core 21 facing the radially outer side of the main rotor core 12, slots, not shown, extending in the axial direction are formed at intervals in the circumferential direction. Main stator coils 22 are provided in the respective slots and on both outer sides of the main stator core 21 in the axial direction.

A frame 51 is provided radially outside the main rotor core 12 and the main stator 20. A coupling-side bearing bracket 52 and an exciter-side bearing bracket 53 are attached to both ends of the frame 51 in the axial direction. The coupling-side bearing bracket 52 fixedly supports the coupling-side bearing 41, and the exciter-side bearing bracket 53 fixedly supports the exciter-side bearing 42.

A cooler cover 62 is provided above the frame 51. The cooler cover 62 houses the cooler 61. The cooler 61 has a cooling pipe, not shown, and cools the cooling gas flowing outside the cooling pipe by a cooling medium such as cooling water or air in the cooling pipe.

The frame 51 and the cooler cover 62 communicate with each other through the cooler inlet opening 51a and the cooler outlet opening 51 b. The cooler inlet opening 51a is formed above the inner fan 15. The cooler outlet opening 51b is formed on the opposite side of the cooler inlet opening 51a so as to sandwich the main stator 20 in the axial direction.

In the frame 51,

partition plates

51c and 51d having circular openings are provided. The spacer 51c is provided outside the main stator core 21 in the direction of the connection-side bearing 41. The spacer 51d is provided on the outside of the main stator core 21 in the direction of the exciter side bearing 42.

The exciter rotor shaft 11a is connected to an extension of the portion of the main rotor shaft 11 supported by the exciter side bearing 42. In addition, although the excitation device rotor shaft 11a and the main rotor shaft 11 are separate members in embodiment 1, the main rotor shaft 11 and the excitation device rotor shaft 11a may be integrated, and an extension portion of the main rotor shaft 11 may form the excitation device rotor shaft 11a.

The exciter 100 includes an exciter 120 and a rotating rectifier 110. The exciter 120 includes: an exciter rotor 121 having an exciter rotor coil (not shown), and an exciter stator 122. The exciter rotor 121 and the rotating rectifier 110 are attached to the exciter rotor shaft 11a and rotate together with the exciter rotor shaft 11a.

The exciter stator 122 is disposed to face the exciter rotor 121 on the radially outer side of the exciter rotor 121, is annular, and is supported from the outside in a stationary manner. Dc power is supplied from a power supply (not shown) to a coil (not shown) of the exciter stator 122. The exciter stator 122 is not limited to the case of using an electromagnet based on a coil. For example, when control of the field current of brushless rotating electric machine 200, that is, the current flowing through the coil of main rotor 10 is not necessary, the case may be a permanent magnet.

The exciter 100 is covered with an exciter cover 63. The exciter inlet opening 64a, which is an inlet of the cooling gas of the exciter cover 63, communicates with the inside of the cooler cover 62 via the exciter inlet pipe 64. The exciter outlet opening 65a, which is an outlet for the cooling gas of the exciter cover 63, communicates with the inside of the frame 51 via the exciter outlet pipe 65.

The frame 51, the coupling-side bearing bracket 52, the exciter-side bearing bracket 53, the cooler cover 62, and the exciter cover 63 are coupled to each other to form a closed space 70. The enclosed space 70 contains a cooling gas such as air.

The closed space 70 includes a frame center portion 71, a fan outlet portion 72, a cooler cover portion 73, a frame inlet portion 74, and an excitation device cover portion 75. The frame center portion 71 is a region sandwiched between the partition plate 51c and the partition plate 51d, and the main rotor core 12 and the main stator 20 are provided therein. The fan outlet 72 is a portion between the inner fan 15 and the partition plate 51c and the coupling-side bearing 41. The cooler cover portion 73 is a portion inside the cooler cover 62. The frame entrance 74 is a portion between the exciter side bearing 42 and the partition plate 51d. The exciter cover portion 75 is a portion inside the exciter cover 63.

Fig. 2 is a quarter cross-sectional view looking along line II-II of fig. 1. A support member 115, also referred to as a retaining ring, is attached to the exciter rotor shaft 11a. The support member 115 is a disk-shaped member having a through hole formed in the center thereof and extending in a direction perpendicular to the axis. The support member 115 has support member openings 115a formed therein at intervals in the circumferential direction.

The support member 115 is provided with a plurality of rotating rectifiers 110 spaced apart from each other in the circumferential direction. Each of the rotary rectifiers 110 has a rectifying element 111, a heat dissipating portion 112, a connecting portion 113, and a fastening portion 114. Each of the 2 rotating rectifiers 110 is disposed so as to sandwich the support member 115 in the axial direction. The heat dissipation portion 112 is disposed radially outward of the rotary rectifier 110, and axially penetrates the support member 115. The 2 rotating rectifiers 110 adjacent to each other with the support member 115 interposed therebetween share the same heat dissipation portion 112, and the rectifier elements 111 are connected to the heat dissipation portion 112 on both axial sides of the support member 115.

The rectifier element 111 is disposed at a position radially inward of the heat dissipation portion 112 and facing the support member opening 115a. The heat generated by the rectifying elements 111 is transferred to the heat radiating section 112, and is transferred and diffused from the surface of the heat radiating section 112 to the cooling gas. A fastening portion 114 is disposed on the rotary rectifier 110 on the radially innermost side, and a connecting portion 113 connects the fastening portion 114 and the rectifying element 111.

An annular member 116 formed in an annular shape is attached to an end portion of the disk in the radial direction of the support member 115 so as to surround the support member 115. A plurality of inclined portions 118a (fig. 3) are continuously formed on a radial surface of the rotating commutator 110, specifically, a radial outer surface of the annular member 116.

Fig. 3 is a perspective view of a ring-shaped member of a rotating rectifier in the brushless rotating electric machine. The annular member 116 is annular and extends in the axial direction. The annular member 116 has 3 portions of a central portion 117 and 2 stirring portions 118 sandwiching the central portion 117 in the axial direction. Each stirring portion 118 has a plurality of inclined portions 118a formed continuously in the circumferential direction. There is a step (japanese text: step) in the radial direction between the inclined portions 118a adjacent to each other in the circumferential direction. The rotation direction of the rotating rectifier 110 is a circumferential direction on which the diameter increases with respect to a change in the circumferential angle in the inclined portion 118a, as indicated by an arrow a in fig. 2 and 3.

In the present embodiment configured as described above, main rotor shaft 11 rotates during operation of brushless rotating electric machine 200. As a result, the inner fan 15 rotates to drive the cooling gas in the closed space 70. Cooling gas is circulated through various portions within enclosed space 70. That is, the air flows out to the fan outlet portion 72 driven by the inner fan 15 from the frame center portion 71, and flows into the cooler cover portion 73 through the cooler inlet opening 51 a. After being cooled in the cooler 61 in the cooler cover portion 73, the coolant flows into the frame inlet portion 74 through the cooler outlet opening 51b and flows into the frame center portion 71.

In parallel with the flow path from the cooler cover portion 73 to the frame inlet portion 74, there is a flow path through the exciter cover portion 75. That is, after being cooled in the cooler 61 in the cooler cover portion 73, the excitation device inlet pipe 64 passes through and flows into the excitation device cover portion 75, and further flows into the frame inlet portion 74 via the excitation device outlet pipe 65.

The cooling gas of the exciter cover portion 75 cools the exciter 100. Fig. 1 shows a position where the excitation device inlet opening 64a, which is the outlet of the excitation device inlet pipe 64 to the excitation device cover section 75, is provided, and a position where the excitation device outlet opening 65a, which is the inlet of the excitation device outlet pipe 65 from the excitation device cover section 75, is provided, in a relatively close state. However, it is desirable that the exciter inlet opening 64a and the exciter outlet opening 65a are located on opposite sides of the exciter 100, for example. That is, it is desirable that the total amount of the cooling gas flowing into the exciter cover portion 75 contributes to cooling of the exciter 100.

However, due to restrictions on the arrangement, etc., the position where the excitation device inlet opening 64a is provided and the position where the excitation device outlet opening 65a is provided are not necessarily located on opposite sides to each other. Even if the cooling gas is located on the opposite side, the total amount of the cooling gas passing through the exciter cover portion 75 does not always contribute to cooling of the exciter 100 in the exciter cover portion 75.

In the present embodiment, since the inclined portion 118a is formed in the annular member 116 of the rotating rectifier 110, the cooling gas in the exciter cover portion 75 is agitated. As a result, the temperature of the cooling gas in the exciter cover portion 75 is equalized, and the temperature of a portion that locally reaches a high temperature, such as the rotating rectifier 110, is reduced.

As described above, in the present embodiment, in the brushless rotating electrical machine 200 having the rotating rectifier 110, the cooling performance of the excitation device can be ensured while suppressing the influence on the arrangement of the rotating rectifier 110.

[ 2 nd embodiment ]

Fig. 4 is a perspective view of a ring-shaped member of a rotating rectifier in the brushless rotating electric machine according to embodiment 2.

This embodiment is a modification of embodiment 1. In embodiment 2, the annular member 119 is formed with a plurality of inclined portions 119a continuously in the circumferential direction over the entire radially outer surface.

Further, the shape of each inclined portion 119a in the circumferential direction changes in the axial direction. That is, the ridge of the inclined portion 119a is formed to have an angle with respect to the axial direction.

Therefore, as the rotating rectifier 110 rotates, a fan effect is generated that drives the cooling gas in the axial direction on the surface of the annular member. As described above, in the present embodiment, in addition to the effect of uniformizing the temperature of the cooling gas in the exciter cover portion 75 by the stirring effect, the effect of increasing the cooling gas flowing into the exciter cover portion 75 side is obtained.

[ other embodiments ]

The embodiments of the present invention have been described above, but the embodiments are presented as examples and are not intended to limit the scope of the invention.

These embodiments may be implemented in various other ways, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention.

These 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.

Claims

1. A brushless rotating electric machine is provided with:

a main rotor having: a main rotor shaft that is supported so as to be rotatable and extends in an axial direction, and a main rotor core that is fixed to a radially outer side of the main rotor shaft and extends in the axial direction;

a main stator having: a main stator core disposed radially outside the main rotor core and extending in an axial direction; and a main stator coil wound around the main stator core;

an excitation device is provided with: an excitation device rotor shaft coupled to an axial end of the main rotor shaft and extending in an axial direction; a rotating rectifier that rotates together with the exciter rotor shaft; and an exciter, the exciter comprising: an exciter rotor that rotates together with the exciter rotor shaft; and an exciter stator disposed radially outward of the exciter rotor so as to face the exciter rotor, and fixedly supported radially outward of the exciter rotor;

a frame that houses the main rotor core and the main stator;

a cooler for cooling a cooling gas, which cools the main stator and the main rotor core in the frame, as a fluid on a cooling side outside the tube;

a cooler cover which is attached to an upper portion of the frame, forms a closed space together with the frame, houses the cooler, and communicates with the frame through a cooler inlet opening for inflow from the frame and a cooler outlet opening for outflow into the frame;

an excitation device cover in which the excitation device is built, the excitation device cover being in communication with the cooler cover and the frame; and

an inner fan attached to the main rotor shaft for circulating the cooling gas in the closed space,

the brushless rotary electric machine is characterized in that,

a plurality of inclined portions that stir the cooling gas in the exciter cover are continuously formed in a circumferential direction on an outer surface of an annular member of the rotating rectifier in a radial direction, the plurality of inclined portions being inclined with respect to the radial direction of the annular member,

the inclined portion has a 1 st surface and a 2 nd surface, the 1 st surface is continuous with the 2 nd surface, the 2 nd surface is continuous with the 1 st surface of the adjacent inclined portion, and a connecting line between the 1 st surface and the 2 nd surface is formed to have an angle with respect to the axial direction.

2. Brushless rotating machine according to claim 1,

the rotary rectifier includes:

a disk-shaped support member attached to the exciter rotor shaft and extending in a radial direction to support the rectifying element; and

the annular member is provided radially outward of the support member, and the inclined portion is continuously formed on a radial surface thereof.

3. Brushless rotating electric machine according to claim 1 or 2,

there is a step in the radial direction between the above-described inclined portions adjacent to each other in the circumferential direction.