JP5746115B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine including an electrical connection portion that contacts a brush while rotating.

  In a rotating electrical machine, electric supply and demand is exchanged with the outside by bringing a brush electrically connected to an electrical device such as an external inverter or battery into contact with an electrical connection portion such as a rotating commutator or slip ring. Is done. In addition to generating heat when the current flows, the brush is pressed against the electrical connecting portion that rotates together with the rotor, and maintains the contact state while sliding with the electrical connecting portion, so that the brush also generates heat due to friction. However, when the temperature of the brush rises above a predetermined temperature, the wear resistance is drastically reduced and the amount of wear is dramatically increased, so that the durability is remarkably lowered. In addition, the brush is worn by sliding contact with the electrical connection portion and generates wear powder, but when this wear powder accumulates in the vicinity of the brush and gets stuck between the brush and the electrical connection portion, Abnormal wear of the brush occurs, and the durability is significantly reduced. For this reason, the technique which suppresses the temperature rise of a brush and the technique which suppresses accumulation of the abrasion powder of a brush are proposed.

  For example, Patent Document 1 describes an invention for cooling a slip ring of an AC generator. This slip ring has a cylindrical strength member fixed to the rotor shaft of the AC generator, and two metal rings attached to the outer peripheral surface of the strength member side by side in the axial direction. Yes. The two brushes then contact the two metal rings, respectively, thereby passing current through the rotor field coils. Moreover, the through-hole which penetrates a strength member from the outer peripheral surface to the outer peripheral surface on the opposite side is formed in the outer peripheral surface of the strength member between metal rings. That is, the through hole extends in a direction perpendicular to the axial direction of the strength member and penetrates the strength member. When the strength member of the slip ring rotates together with the rotor, a flow of air that flows around the through hole and the strength member is generated due to a difference in dynamic pressure generated at the openings at both ends of the through hole. This air flow cools the metal ring and brush of the slip ring.

  Patent Document 2 describes an invention for removing brush abrasion powder from a slip ring of a rotating electrical machine. This rotating electric machine has a rotating shaft to which a rotor having a three-phase rotor coil is connected. A cylindrical resin tube portion made of resin is fitted and fixed to the outer peripheral portion of the rotating shaft, and further, three slip rings spaced in the axial direction are provided on the outer periphery of the resin tube portion. It is attached. Each of the three brushes comes into contact with the three slip rings. Furthermore, a large number of protrusions extending obliquely in the circumferential direction and the axial direction of the resin cylinder part are formed on the surface of the resin cylinder part between the slip rings with a predetermined pitch in the circumferential direction. Therefore, when the rotating shaft rotates together with the rotor, the projections that rotate together with the resin cylinder portion generate a flow that flows in one axial direction while turning around the resin cylinder portion with respect to the surrounding air. This air flow blows away the abrasion powder of the brush.

JP-A-2-26250 JP 2001-69726 A

  However, in the invention described in Patent Document 1, an air flow is generated on a strength member that is smaller in the radial direction than the metal ring that contacts the brush, and in the invention described in Patent Document 2, the slip that contacts the brush is generated. An air flow is generated on the resin cylinder portion that is smaller in the radial direction than the ring. For this reason, in both Patent Documents 1 and 2, there is a problem that the air flow is weak around the brush, and the cooling efficiency of the brush and the removal efficiency of the abrasion powder of the brush are low.

  The present invention has been made in order to solve the above-described problems, and the rotation that makes it possible to improve the cooling efficiency of the brush contacting the rotating electrical connection and the removal efficiency of the abrasion powder generated from the brush. The purpose is to provide an electric machine.

In order to solve the above problems, a rotating electrical machine according to the invention comprises a rotary shaft rotatable and an electrical connection portion having an outer peripheral surface in contact with the rotating and rotating while brush with the rotating shaft, the outer peripheral surface Extends circumferentially around the central axis of rotation of the electrical connecting portion, the outer peripheral surface is in contact with the brush when the electrical connecting portion rotates, and the brush regardless of whether the electrical connecting portion is rotating or not rotating. and a non-contact area that is not in contact with, electrical connections, as well as the opening in the contact touch region, a first opening for collecting the abrasion powder generated by contact with the electrical connections and the brush, is provided in the non-contact region was possess a protrusion, the protrusion protrudes from the outer peripheral surface in a direction opposite to the rotation direction of the electrical connections.

A plurality of first openings may be provided along the circumferential direction of the outer peripheral surface, and the plurality of first openings may include first openings having different positions in the axial direction of the rotating shaft.
Furthermore, the 1st opening part adjacent in the circumferential direction of an outer peripheral surface may mutually differ in the position in the axial direction of a rotating shaft.
Moreover, an electrical connection part may have a 2nd opening part in the side surface which faces the axial direction of a rotating shaft, and a 2nd opening part may be connected to a 1st opening part.
Furthermore, the second opening may form a hole that penetrates the electrical connecting portion in the axial direction of the rotating shaft.
A plurality of first openings are provided along the circumferential direction of the outer peripheral surface, and a plurality of first openings are provided along the axial direction of the rotating shaft. The first opening is arranged in the contact area along the axial direction of the rotating shaft. At least one opening group may be formed in which a plurality of columns are arranged close to each other.
The first opening may be a hole that opens in an area smaller than the contact area of the brush with the outer peripheral surface and extends from the outer peripheral surface toward the rotating shaft.

Further, the first opening and the second opening may integrally form a groove extending in the axial direction of the rotating shaft and opening on the outer peripheral surface.
Further, the groove may be recessed toward the rotating shaft, and the opening width in the circumferential direction on the outer circumferential surface may be narrower than the circumferential width of the contact surface of the brush with respect to the outer circumferential surface.
A plurality of protrusions may be provided along the circumferential direction of the outer peripheral surface.

  According to the rotating electric machine according to the present invention, it is possible to improve the cooling efficiency of the brush that contacts the rotating electrical connection portion and the removal efficiency of the abrasion powder generated from the brush.

It is a schematic cross section side view which shows the structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG. 2, and is a figure which shows the top view of a slip ring. It is sectional drawing which shows the structure of the slip ring of the rotary electric machine which concerns on Embodiment 2 of this invention, and its periphery similarly to FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 and is a diagram showing a plan view of the slip ring. It is sectional drawing which shows the structure of the slip ring of the rotary electric machine which concerns on Embodiment 3 of this invention, and its periphery similarly to FIG. It is sectional drawing along the VII-VII line of FIG. 6, and is a figure which shows the top view of a slip ring.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
First, the structure of the rotary electric machine 1 according to Embodiment 1 of the present invention will be described with reference to FIGS.

Referring to FIG. 1, the rotating electrical machine 1 includes a metal rotary shaft 10, a cylindrical first rotor 11, a cylindrical second rotor 12, and a cylindrical stator 13 in the housing 2. It constitutes a double rotor type rotating electrical machine.
The rotating shaft 10 extends outside through the housing 2 at both ends thereof, and is rotatably supported by the housing 2 via bearings. One end of the rotating shaft 10 is mechanically coupled to power (not shown), and a slip ring mechanism 100 for supplying and supplying power to the outside of the rotating electrical machine 1 is attached to the other end. The slip ring mechanism 100 is configured to rotate integrally with the rotary shaft 10.

The first rotor 11 is provided so as to surround the outer peripheral surface 10 a of the rotary shaft 10 and rotates integrally with the rotary shaft 10. The first rotor 11 has a coil (not shown) arranged along the circumferential direction therein.
The second rotor 12 is provided so as to surround the outer periphery of the first rotor 11 in the radial direction, and is supported by a substantially cylindrical second rotor bracket 12a. The second rotor 12 and the second rotor bracket 12a are integrally supported by the outer peripheral surface 10a of the rotating shaft 10 so as to be relatively rotatable. The 2nd rotor 12 has the permanent magnet 12b arrange | positioned along the circumferential direction in the inside.
The stator 13 is provided so as to surround the outer periphery of the second rotor 12 in the radial direction, and is fixed to the housing 2. The stator 13 has a coil (not shown) arranged along the circumferential direction therein.

In the rotating shaft 10, three bus bars 21 having conductivity are inserted into a recess 10 c formed along an axial direction from an end 10 b protruding from the housing 2.
Each bus bar 21 is inserted into the three terminal holes 10 d on the outer peripheral surface 10 a of the rotary shaft 10 and is electrically connected to the rotary shaft 10. It is electrically connected to the coil of the first rotor 11 through the lead 23 connected to the. Further, each bus bar 21 is electrically insulated from the other bus bars 21 and the rotating shaft 10 by a resin 24 which is an insulating material filled in the recess 10 c of the rotating shaft 10.

  The slip ring mechanism 100 is attached around the outer peripheral surface 10 a of the rotary shaft 10. The slip ring mechanism 100 includes three annular plate-like insulating plates 101, 102, and 103 having electrical insulation, and three cylindrical slip rings 110, 120, and 130 made of metal and having conductivity. Further, it has a structure in which it is alternately stacked in the axial direction of the rotary shaft 10 so as to fit around the outer peripheral surface 10a. Further, the slip ring mechanism 100 has a ring-shaped end insulating plate 104 having electrical insulation at the end 10 b of the rotary shaft 10. The insulating plates 101, 102 and 103, the slip rings 110, 120 and 130, and the end insulating plate 104 are each formed with the same outer diameter so that they all rotate together with the rotating shaft 10. It is fixed to the rotating shaft 10. Here, the slip rings 110, 120, and 130 constitute an electrical connection portion.

  An insulating plate 101 is disposed in close proximity to the outer peripheral surface 10a of the rotary shaft 10 in the vicinity of the housing 2, and further, adjacent to the insulating plate 101, slip rings 110, 120 and 130, insulating plates 102 and 103, Are arranged alternately. The insulating plates 101, 102 and 103 electrically insulate between the slip ring 110 and the housing 2 and between the slip rings 110, 120 and 130.

An end insulating plate 104 is disposed adjacent to the slip ring 130 located at the end opposite to the housing 2. Then, a nut 25 is fastened to the male screw 21a formed at each end of the bus bar 21 protruding through the end insulating plate 104, whereby the stacked end insulating plate 104, slip rings 110, 120 are stacked. And 130 and the insulating plates 101, 102 and 103 are fixed to the rotary shaft 10.
At this time, the insulating plates 101, 102 and 103, the slip rings 110, 120 and 130, and the end insulating plate 104 have their respective central axes as the central axis C (see FIG. 2) which is the rotational central axis of the rotary shaft 10. It is the same.

  Each slip ring 110, 120, and 130 is connected to the rotating shaft 10 by a cylindrical insulating ring 140 (see FIG. 2) made of an electrically insulating material provided between the slip ring 110, 120, and 130 and the outer peripheral surface 10 a of the rotating shaft 10. And is electrically insulated. Further, each of the slip rings 110, 120, and 130 is electrically connected to one bus bar 21 that is different from each other by a connection bar 150 (see FIG. 2) that has conductivity but is electrically insulated from the periphery.

A bottomed cylindrical cover 3 is provided so as to surround the slip ring mechanism 100 and is fixed to the housing 2.
Brush devices 105, 106, and 107 are provided and fixed to the cylindrical inner peripheral surface 3 a of the cover 3 at positions facing the respective peripheral surfaces of the slip rings 110, 120, and 130 of the slip ring mechanism 100. Brush devices 105, 106 and 107 have their brushes in contact with slip rings 110, 120 and 130, respectively. Further, like the brush device 105 shown in FIG. 2, three brush devices 105, 106 and 107 are provided at equal intervals along the circumferential direction of the inner peripheral surface 3a, and all have the same structure.
The inside of the cover 3 communicates with the outside through a cover through hole 3b formed in the cover 3 so as to face the brush device 105, 106 or 107 in the direction of the central axis C (see FIG. 2). It communicates with the interior of the housing 2 through a housing through hole 2a formed in the housing 2 so as to face the brush device 105, 106 or 107 in the direction of the axis C.

1 and 2 together, the brush device 105 includes a first brush device 105a, a second brush device 105b, and a third brush device 105c.
The first, second and third brush devices 105a, 105b and 105c are respectively fixed to the cover 3 and have brush insertion parts 105ab, 105bb and 105cb having insertion holes 105ac, 105bc and 105cc, and insertion holes in the brush holding part. The brushes 105aa, 105ba and 105ca are slidably inserted. Each of the brushes 105aa, 105ba, and 105ca is slidable in the radial direction of the slip ring 110, and is pressed against the peripheral surface of the slip ring 110 by a biasing member (not shown). Furthermore, each of the brushes 105aa, 105ba, and 105ca is electrically connected to an electric device such as an external inverter and a battery through leads (not shown).
The first brush device 105a, the second brush device 105b, and the third brush device 105c are arranged at equal intervals in the circumferential direction of the rotary shaft 10, and have a rotationally symmetric relationship with a central angle of 120 ° about the central axis C. It has become.

  Each of the brush devices 106 and 107 is also constituted by three brush devices fixed to the cover 3 in a rotationally symmetric relationship with a central angle of 120 ° around the central axis C, and each brush device is constituted by a brush holding portion and a brush. It is configured. Furthermore, all the brush devices of the brush devices 105 to 107 are arranged so as to be shifted in the circumferential direction around the central axis C so as not to overlap each other when viewed in the direction along the central axis C. . Then, a three-phase alternating current is supplied from the brushes of the brush devices 105 to 107 to the coil of the first rotor 11 of the rotating electrical machine 1 through the slip rings 110 to 130 and the bus bar 21.

Further, a detailed configuration of the slip ring 110 will be described.
Referring to FIG. 2 showing a cross section of the slip ring 110 and FIG. 3 showing a plan view of the slip ring 110 viewed from the side of the cylinder in FIG. 2, the slip ring 110 is formed on the outer peripheral surface 10 a of the rotary shaft 10. It has a fixed metal and cylindrical main body 111. The main body 111 rotates together with the rotating shaft 10 in the direction P (counterclockwise direction on the paper surface of FIG. 2). The brushes 105aa to 105ca of the brush device 105 are in contact with the cylindrical outer peripheral surface 111a of the main body 111.
For this reason, the outer peripheral surface 111a that rotates together with the main body 111 is divided into a contact area 111aa that contacts the brushes 105aa to 105ca during rotation and a non-contact area 111ab that does not contact the brushes 105aa to 105ca regardless of rotation or non-rotation. Is done.

As shown in FIG. 3, in the outer peripheral surface 111 a, the contact region 111 aa is formed in the center in the direction along the central axis C and in a band shape along the circumferential direction, and the non-contact region 111 ab is in the direction along the central axis C. Each of the two areas on both sides of the contact region 111aa is formed in a strip shape along the circumferential direction.
A plurality of holes 113 are formed in the contact region 111aa of the outer peripheral surface 111a at regular intervals along the circumferential direction. The holes 113 are formed one by one in the direction along the central axis C. Further, the hole 113 has a circular cross section and extends toward the rotary shaft 10 and opens in the outer peripheral surface 111a with an area smaller than the contact surface of the brushes 105aa to 105ca with respect to the outer peripheral surface 111a. Here, the hole 113 constitutes a first opening.

  The plurality of holes 113 are arranged at different positions along the central axis C. That is, in the first embodiment, the plurality of holes 113 are configured by the first hole 113a, the second hole 113b, and the third hole 113c arranged at three different positions in the direction along the central axis C. A plurality of first holes 113a, second holes 113b, and third holes 113c are formed in the same quantity, and each hole is formed along the circumferential direction of the outer peripheral surface 111a, the first hole 113a, the second hole 113b, and the third hole 113c. And the first hole 113a in this order. Therefore, the holes 113 adjacent in the circumferential direction of the outer peripheral surface 111a are displaced from each other in the central axis C direction.

  Further, the width regions that the first hole 113a, the second hole 113b, and the third hole 113c occupy in the central axis C direction in the contact region 111aa are overlapped with each other. The entire width region occupied by the first hole 113a, the second hole 113b, and the third hole 113c in the central axis C direction covers the entire width of the contact region 111aa in the central axis C direction. Therefore, when the main body 111 is rotated in the direction P, in each of the brushes 105aa to 105ca, the contact surface with the outer peripheral surface 111a contacts the hole 113 substantially uniformly over the entire region.

  Further, in the main body 111, a through hole 114 that penetrates the main body 111 is formed on both the side surfaces 111 b and 111 c facing in the direction along the central axis C inside the holes 113 on the side of the rotary shaft 10. One through hole 114 is formed for each hole 113 and communicates with the corresponding hole 113. Here, the through hole 114 constitutes a second opening.

In addition, a plurality of protrusions 112 are integrally formed in each non-contact region 111ab of the outer peripheral surface 111a with a certain interval along the circumferential direction of the main body 111. Each protrusion 112 is disposed adjacent to the contact region 111aa, and the protruding tip 112a protrudes in a direction opposite to the rotation direction P of the main body 111 and away from the outer peripheral surface 111a. That is, each protrusion 112 protrudes in the same direction with respect to the outer peripheral surface 111a.
In the case of the metal main body 111 as in the first embodiment, the protrusion 112 cuts in the rotation direction P with respect to the outer peripheral surface 111a and causes the cut portion to move away from the outer peripheral surface 111a. Can be formed. The protrusion 112 may be formed together with the main body 111 at the time of molding.

Also, the slip rings 120 and 130 have the same configuration as the slip ring 110.
Referring to FIG. 1, the through hole 124 of the slip ring 120 and the through hole 134 of the slip ring 130 are each a through hole of the slip ring 110 when viewed in the direction along the central axis C (see FIG. 2) of the rotating shaft 10. It is formed to have the same position and cross-sectional shape as 114.
Further, the insulating plates 101, 102, and 103 and the end insulating plate 104 also have a plurality of through holes 101a, 102a, 103a, and 104a that pass through them in the direction along the central axis C (see FIG. 2) of the rotary shaft 10, respectively. Is formed. Each of the through holes 101a to 104a is also formed to have the same position and cross-sectional shape as the through hole 114 of the slip ring 110 when viewed in the direction along the central axis C of the rotary shaft 10. Therefore, the through holes 114 to 134 of the slip rings 110 to 130, the through holes 101a to 103a of the insulating plates 101 to 103, and the through holes 104a of the end insulating plate 104 are aligned in a direction along the central axis C. .

Next, the operation of the rotary electric machine 1 according to Embodiment 1 of the present invention will be described.
Referring to FIG. 1, when a three-phase alternating current is supplied to each brush of the brush devices 105 to 107, the supplied current is the slip rings 110, 120 and 130 of the slip ring mechanism 100, each bus bar 21, each connection The electric power is supplied to the coil of the first rotor 11 of the rotating electrical machine 1 through the terminal 22 and each lead 23. The current flowing through the coil of the first rotor 11 generates a rotating magnetic field, and the second rotor 12 is rotated by the electric torque generated by the rotating magnetic field in the permanent magnet 12 b of the second rotor 12.

  Further, when the rotary shaft 10 is driven to rotate by receiving external force from power not shown, the first rotor 11 rotates together with the rotary shaft 10, and accordingly, the coil of the first rotor 11 is permanently attached to the coil of the first rotor 11. An induced current is generated by the action of the magnetic field generated by the magnet 12b. The generated induced current is supplied to each brush of the brush devices 105 to 107 via each lead 23, each connection terminal 22, each bus bar 21, and slip rings 110, 120, and 130, and further electrically connected to the brush. Supplied to electrical equipment such as inverters and batteries.

And in order to cool the coil of the 1st rotor 11 which generate | occur | produces heat when an electric current flows, the gas for cooling, such as external air, is supplied into the inside of the housing 2 of the rotary electric machine 1 from the outside.
External air supplied into the housing 2 flows into the inside of the cover 3 through the housing through hole 2a, and further flows through the inside of the cover 3, and is then discharged to the outside through the cover through hole 3b. .

Inside the cover 3, a part of the air comes into contact with the brushes of the brush devices 105 to 107 in the middle of flowing from the housing through hole 2 a toward the cover through hole 3 b, and cools them.
A part of the air in the cover 3 flows into the through hole 101 a of the insulating plate 101. The inflowing air passes through the through hole 101a continuous in the direction of the central axis C (see FIG. 2), the through hole 114 of the slip ring 110, the through hole 102a of the insulating plate 102, the through hole 124 of the slip ring 120, and the through of the insulating plate 103. It sequentially passes through the hole 103a, the through hole 134 of the slip ring 130, and the through hole 104a of the end insulating plate 104, and then flows toward the cover through hole 3b.

2 and 3 together, in the slip ring 110 that rotates together with the rotating shaft 10, the protrusion 112 that rotates together rotates on the outer peripheral surface 111a of the main body 111 in the rotation direction P and flows downstream. A spiral air flow that flows away from the outer peripheral surface 111a toward the side is generated.
The air flow generated by the protrusions 112 on the outer peripheral surface 111a with which the brushes 105aa to 105ca come into contact improves the cooling efficiency of the brushes 111aa to 105ca and the main body 111 of the slip ring 110 by the air. Further, the main body 111 is more efficiently cooled by the air flow generated by the protrusion 112 because the protrusion 112 increases the contact area with the surrounding air and improves heat dissipation. By these actions, the temperature rise of each brush 105aa to 105ca is suppressed. Furthermore, each of the brushes 105aa to 105ca wears the contact surface by sliding on the outer peripheral surface 111a to generate wear powder, but the wear powder leaking out from the contact surface with the outer peripheral surface 111a is a protrusion. The air flow 112 is blown away.

In addition, most of the wear powder generated on the contact surface of the brushes 105aa to 105ca with the outer peripheral surface 111a of the main body 111 is collected so as to be scraped off by the hole 113 facing the contact surface in the entire region of the contact surface. The Further, air is circulated in the through hole 114 as described above. As a result, a negative pressure is generated in the hole 113, so that the wear powder of each of the brushes 105aa to 105ca is collected in the hole 113 even if it is sucked. And the abrasion powder collect | recovered in the hole 113 is discharged | emitted by the air flow which flows through the through-hole 114 to the exterior of the slip ring mechanism 100 (refer FIG. 1).
Further, the main body 111 of the slip ring 110 is formed with the hole 113 and the through hole 114, thereby increasing the contact area with the surrounding air and improving the heat dissipation. The main body 111 is cooled not only by ambient air but also by air flowing through the through hole 114. Therefore, the cooling efficiency of the main body 111 is improved, and the increase in temperature of the brushes 105aa to 105ca can be suppressed by improving the cooling efficiency.

  Also in the slip rings 120 and 130, as in the case of the slip ring 110, the air flow generated by the protrusions cools the slip ring and each brush, and around the contact surface with the slip rings 120 and 130. Wear powder is removed. Further, the wear powder on the contact surface of the brush is discharged to the outside of the slip ring mechanism 100 through the holes on the outer peripheral surface of the slip rings 120 and 130 and the through holes 124 and 134, and the air flowing through the through holes 124 and 134 As a result, the slip rings 120 and 130 are cooled. (See Figure 1)

  As described above, the rotary electric machine 1 according to Embodiment 1 of the present invention includes a rotatable rotating shaft 10 and a slip ring having the outer peripheral surface 111a that rotates with the rotating shaft 10 and contacts the brushes 105aa to 105ca while rotating. 110. The outer peripheral surface 111 a extends in the circumferential direction around the rotation center axis C of the slip ring 110. The slip ring 110 includes a hole 113 provided in a contact region 111aa in contact with the brushes 105aa to 105ca on the outer peripheral surface 111a and a protrusion 112 provided in a non-contact region 111ab in which the brushes 105aa to 105ca on the outer peripheral surface 111a are not in contact. And have.

  At this time, the slip ring 110 increases the heat dissipating area and improves the heat dissipating property by forming the hole 113 and the protrusion 112. Further, since the protrusion 112 generates an air flow when the slip ring 110 rotates, the air flow effectively cools the slip ring 110 with improved heat dissipation, and directly cools the brushes 105aa to 105ca. The Therefore, the cooling effect of the brushes 105aa to 105ca is improved. Further, the wear powder around the brushes 105aa to 105ca is blown off by the air flow generated by the protrusions 112, and the wear powder on the sliding portions of the brushes 105aa to 105ca is further scraped off by the opposed holes 113 and collected. Is done. Therefore, the rotating electrical machine 1 can improve the cooling efficiency of the brushes 105aa to 105ca and the removal efficiency of the abrasion powder generated from the brushes 105aa to 105ca.

  Further, in the slip ring 110 of the rotating electrical machine 1, a plurality of holes 113 are provided along the circumferential direction of the outer peripheral surface 111 a, and the plurality of holes 113 include holes 113 having different positions in the axial direction of the rotating shaft 10. Yes. Further, the holes 113 adjacent to each other in the circumferential direction of the outer peripheral surface 111a are different from each other in the axial direction of the rotary shaft 10. At this time, by making the positions of the plurality of holes 113 different in the axial direction of the rotary shaft 10, the holes 113 can be arranged over the entire axial direction of the rotary shaft 10 in the contact region 111aa. Furthermore, the holes 113 can be prevented from being biased to the same axial position by making the axial positions of the rotary shafts 10 different in the adjacent holes 113 in the circumferential direction of the outer peripheral surface 111a. Therefore, it is possible to prevent uneven wear of the brushes 105aa to 105ca sliding on the contact region 111aa with the hole 113.

  In the rotating electrical machine 1, the slip ring 110 has through holes 114 on the side surfaces 111 b and 111 c facing in the axial direction of the rotary shaft 10, and the through holes 114 communicate with the holes 113. Further, the through hole 114 passes through the slip ring 110 in the axial direction of the rotary shaft 10. Thereby, the abrasion powder of the brushes 105aa to 105ca collected in the hole 113 can be discharged from the through hole 114 to the outside of the slip ring 110. Further, by allowing air to flow through the through-hole 114 penetrating the slip ring 110, the negative pressure generated in the hole 113 improves the ability to collect wear powder.

  In the slip ring 110 of the rotating electrical machine 1, a plurality of protrusions 112 are provided along the circumferential direction of the outer peripheral surface 111 a, and each of the protrusions 112 faces the outer peripheral surface 111 a in a direction opposite to the rotation direction P of the slip ring 110. Protruding from. At this time, when the slip ring 110 rotates, the protrusion 112 generates a flow of spiral air that flows along the circumferential direction of the outer peripheral surface 111a and gradually moves away from the outer peripheral surface 111a toward the downstream side of the flow. A stable air flow in a certain direction is generated around the slip ring 110 and the brushes 105aa to 105ca. Therefore, the slip ring 110 and the brushes 105aa to 105ca are evenly cooled by the air flow, and the wear powder of the brushes 105aa to 105ca is also efficiently removed. On the other hand, when the protruding direction of the protrusion 112 is opposite to the above, turbulent flow is generated around the slip ring 110 and the brushes 105aa to 105ca, and the cooling effect and wear powder removing ability are biased.

  In the rotating electrical machine 1 of the first embodiment, one hole 113 is formed in the direction along the central axis C on the outer peripheral surface 111a of the main body 111 of the slip ring 110. However, the present invention is not limited to this. Alternatively, two or more may be formed. Also in this case, it is preferable to arrange the holes so that the contact surfaces of the brushes 105aa to 105ca with the outer peripheral surface 111a come into substantially uniform contact over the entire area when the main body 111 is rotated.

Embodiment 2. FIG.
A rotating electrical machine according to Embodiment 2 of the present invention is formed by forming holes in the outer peripheral surface of the main body in slip rings 110, 120, and 130 of slip ring mechanism 100 in rotating electrical machine 1 according to Embodiment 1. Are formed in the outer peripheral surface of the main body to form a plurality of grooves extending in the direction of the central axis C.
In the following embodiments, the same reference numerals as those in the previous drawings are the same or similar components, and thus detailed description thereof is omitted.

Referring to FIG. 4, a view of a cross section of a slip ring 210 that is one of the slip rings of the rotating electrical machine according to the second embodiment is viewed from the first rotor 11 (see FIG. 1) side. Furthermore, FIG. 5 which shows the top view which looked at the slip ring 210 in FIG. 4 from the side of a cylinder is also referred.
In the metallic cylindrical body 211 of the slip ring 210 fixed to the outer peripheral surface 10a of the rotating shaft 10, the outer peripheral surface 211a is in contact with the brushes 105aa to 105ca during the rotation as in the slip ring 110 of the first embodiment. It is divided into a contact area 211aa that comes into contact with and a non-contact area 211ab that does not come into contact with the brushes 105aa to 105ca both when rotating and when not rotating. In the outer peripheral surface 211a, the contact region 211aa is formed in a band shape along the circumferential direction in the center in the direction along the central axis C, and the non-contact region 211ab is formed in a band shape along the circumferential direction on both sides of the contact region 211aa. Formed.

  A plurality of grooves 213 are formed in the contact region 211aa of the outer peripheral surface 211a at regular intervals along the circumferential direction. Each groove 213 extends in a direction along the central axis C from the side surface 211b to the side surface 211c of the main body 211, and is recessed toward the rotating shaft 10 side. Furthermore, the opening width of each groove 213 in the circumferential direction on the outer circumferential surface 211a is narrower than the circumferential width of the contact surfaces of the brushes 105aa to 105ca with respect to the outer circumferential surface 211a. Thereby, brushes 105aa-105ca always maintain a contact state with the main body 211.

  In addition, in each non-contact area 211ab of the outer peripheral surface 211a, a plurality of protrusions 212 spaced apart from each other along the circumferential direction are formed in the contact area 211aa in the same manner as the protrusion 112 of the slip ring 110 of the first embodiment. Is formed adjacent to. The protruding tips 212a of the protrusions 212 also protrude in the same direction with respect to the outer peripheral surface 211a so as to face in the opposite direction to the rotation direction P and away from the outer peripheral surface 211a.

Also, in the other two slip rings, like the slip ring 210, a groove is formed on the outer peripheral surface of the main body, and a protrusion is formed in a non-contact region of the outer peripheral surface.
The grooves 213 of the slip ring 210 and the grooves of the other two slip rings are formed so as to have the same position and cross-sectional shape when viewed in the direction along the central axis C.
Furthermore, the insulating plates 101, 102 and 103 and the through holes 101a, 102a, 103a and 104a of the end insulating plate 104 are also identical to the grooves of the respective slip rings when viewed in the direction along the central axis C of the rotating shaft 10. It is arrange | positioned so that it may become a position. (See Figure 1)

Therefore, during the operation of the rotating electrical machine, a part of the air that flows into the cover 3 from the housing 2 of the rotating electrical machine is formed through the through holes 101a to 103a of the insulating plates 101 to 103, the grooves of each slip ring, and the end insulating plates. It flows so as to pass through the through-hole 104a of 104. (See Figure 1)
In the slip ring 210, most of the abrasion powder generated on the contact surface of the brushes 105aa to 105ca with the outer peripheral surface 211a of the main body 211 is recovered by being scraped by the groove 213 facing the contact surface. The air flow that flows through 213 is discharged to the outside of the slip ring mechanism 100 (see FIG. 1).
Further, the main body 211 having the heat radiation area increased by forming the groove 213 is cooled not only by the surrounding air but also by the air flowing through the groove 213. Furthermore, the air flowing through the groove 213 directly contacts and cools the brushes 105aa to 105ca. As a result, the temperature rise of each brush 105aa-105ca is suppressed.

  Further, in the slip ring 210 that rotates together with the rotating shaft 10, the protrusion 212 that rotates together moves away from the outer peripheral surface 211 a toward the downstream side of the flow while turning in the rotation direction P on the outer peripheral surface 211 a of the main body 211. Generates a spiral air flow that flows in a continuous manner. The air flow cools the brushes 105aa to 105ca and the main body 211 whose heat dissipation is improved by the protrusions 212, and wears out from the contact surface with the outer peripheral surface 211a of each brush 105aa to 105ca to the surroundings. Powder is blown away by the air flow generated by the protrusion 212.

Also, in the other slip rings, as in the case of the slip ring 210, the abrasion powder on the contact surface of each brush is discharged to the outside of the slip ring mechanism 100 through the groove on the outer peripheral surface of the slip ring. Furthermore, the air flow generated by the protrusions cools the slip rings and the brushes whose heat dissipation is improved by the grooves and the protrusions, and the wear powder around the contact surfaces of the brushes with the slip rings is removed. Furthermore, each slip ring and each brush are cooled by the air flowing through the groove. (See Figure 1)
Moreover, since the other structure and operation | movement of the rotary electric machine which concern on Embodiment 2 of this invention are the same as that of Embodiment 1, description is abbreviate | omitted.

And according to the rotary electric machine in Embodiment 2, the effect similar to the rotary electric machine 1 of the said Embodiment 1 is acquired.
In the rotating electrical machine of the second embodiment, a groove 213 extending in the axial direction of the rotating shaft 10 and opening at the outer peripheral surface 211a is formed on the outer peripheral surface 211a of the main body 211 of the slip ring 210. Thereby, since the opening width of the circumferential direction of the outer peripheral surface 211a by the groove 213 can be made uniform along the direction of the central axis C, the contact surfaces of the brushes 105aa to 105ca sliding on the groove 213 of the outer peripheral surface 211a. Wear can be evened out. Furthermore, by extending the groove 213 in the entire direction of the central axis C of the contact region 211aa, the wear can be made uniform over the entire contact surface of the brushes 105aa to 105ca. Further, when air flows in the groove 213, the circulating air can directly contact the brushes 105aa to 105ca to cool them.

  In the rotating electrical machine of the second embodiment, the groove 213 that penetrates the main body 211 of the slip ring 210 in the direction along the central axis C is formed. However, the present invention is not limited to this. It may terminate in the middle between the side surfaces 211b and 211c in 211, and only one end of the groove may be open to the outside. In this case, the plurality of grooves are shifted in the direction along the central axis C. The plurality of grooves are arranged so that the width regions that each groove occupies in the direction of the central axis C overlap each other, and the entire width region that each groove occupies in the direction of the central axis C is the central axis C in the contact region 211aa. It is arranged so as to cover the entire width of the direction. Thereby, when the main body 211 is rotated in the direction P, the contact surface with the outer peripheral surface 111a in each of the brushes 105aa to 105ca can contact the groove almost uniformly over the entire region.

Embodiment 3 FIG.
The rotating electrical machine according to Embodiment 3 of the present invention has a constant interval along the circumferential direction of the outer peripheral surface of the main body in slip rings 110, 120, and 130 of slip ring mechanism 100 in rotating electrical machine 1 according to Embodiment 1. A plurality of holes are formed in the direction along the central axis C, and a plurality of holes are formed in the direction along the central axis C. A region in which a plurality of rows of holes are gathered is formed along the circumferential direction of the outer peripheral surface.

Referring to FIG. 6, a view of a cross section of a slip ring 310 that is one of the slip rings of the rotating electrical machine according to the third embodiment as viewed from the first rotor 11 (see FIG. 1) side is shown. Further, FIG. 7 showing a plan view of the slip ring 310 as viewed from the side of the cylinder in FIG. 6 is also referred to.
In the metallic cylindrical body 311 of the slip ring 310 fixed to the outer peripheral surface 10a of the rotating shaft 10, the outer peripheral surface 311a is in contact with the brushes 105aa to 105ca, like the slip ring 110 of the first embodiment. It is partitioned into a region 311aa and a non-contact region 311ab. In the outer peripheral surface 311a, the contact region 311aa is formed in a band shape along the circumferential direction at the center in the direction along the central axis C, and the non-contact region 311ab is formed in a band shape along the circumferential direction on both sides of the contact region 311aa. Formed.

In the contact region 311aa of the outer peripheral surface 311a, a plurality of holes 313c extending toward the rotary shaft 10 and having a circular cross section are formed. The plurality of holes 313c are collected and formed at a plurality of locations along the circumferential direction in the contact region 311aa, and a hole group 313 including the plurality of holes 313c is formed at each location. Here, the hole group 313 constitutes an opening group.
In the third embodiment, each hole group 313 includes a first hole row 313a in which three holes 313c are arranged in the direction along the central axis C, and a second hole row in which two holes 313c are arranged in the direction along the central axis C. 313b are alternately arranged in close proximity at equal intervals.

The holes 313c of the first hole row 313a and the holes 313c of the second hole row 313b are arranged so that their positions in the direction along the central axis C are shifted from each other. That is, when the contact region 311aa is viewed along the circumferential direction, the holes 313c of the second hole row 313b are located between the holes 313c of the first hole row 313a. Therefore, the holes 313c are arranged substantially evenly in the hole group 313, and form a shape like a hole of a punching metal.
Further, the width regions occupied by the holes 313c of the first hole row 313a and the holes 313c of the second hole row 313b in the central axis C direction are overlapped with each other. The entire width region in the central axis C direction of each hole 313c of the first hole row 313a and each hole 313c of the second hole row 313b covers the entire width of the contact region 311aa in the central axis C direction.
Therefore, when the main body 311 is rotated in the direction P, in each of the brushes 105aa to 105ca, the contact surface with the outer peripheral surface 311a contacts the hole 313c substantially uniformly over the entire region.

  Further, in the main body 311, one through hole 314 that penetrates the main body 311 along the central axis C is formed on both side surfaces 311 b and 311 c on the rotary shaft 10 side of each hole group 313. Each of the through holes 314 communicates with all the holes 313c of each hole group 313.

  Further, in each non-contact region 311ab of the outer peripheral surface 311a, a plurality of protrusions 312 spaced apart from each other along the circumferential direction of the main body 311 in the same manner as the protrusion 112 of the slip ring 110 of the first embodiment, It is formed adjacent to the contact region 311aa. The protruding tips 312a of the protrusions 312 also protrude in the same direction with respect to the outer peripheral surface 311a so as to face in the direction opposite to the rotation direction P and away from the outer peripheral surface 311a.

Also, in the other two slip rings, similarly to the slip ring 310, a plurality of hole groups are formed on the outer peripheral surface of the main body, and all the holes of each hole group communicate with through holes that penetrate the main body in the central axis direction. doing. Furthermore, the protrusion is formed in the non-contact area | region of the outer peripheral surface of a main body.
The through hole 314 of the slip ring 310 and the through holes of the other two slip rings are formed to have the same position and cross-sectional shape when viewed in the direction along the central axis C.
Further, the through holes 101a, 102a, 103a, and 104a of the insulating plates 101, 102, and 103 and the end insulating plate 104 are respectively the through holes of the slip rings when viewed in the direction along the central axis C of the rotary shaft 10. They are formed to have the same position and shape. (See Figure 1)

  Therefore, during the operation of the rotating electrical machine, a part of the air that flows into the cover 3 from the housing 2 of the rotating electrical machine, the through holes 101a to 103a of the insulating plates 101 to 103, the through holes of each slip ring, and the end insulation. It flows so as to pass through the through hole 104a of the plate 104. (See Figure 1)

In the slip ring 310, most of the abrasion powder generated on the contact surfaces of the brushes 105aa to 105ca with the outer peripheral surface 311a of the main body 311 is scraped off by the holes 313c of the hole group 313 facing the contact surfaces and through holes. Due to the negative pressure generated by the air flow that flows through 314, the air is sucked into the hole 313c and discharged to the outside of the slip ring mechanism 100 (see FIG. 1) by the air flow in the through hole 314.
Furthermore, the main body 311 whose heat dissipation area is increased by forming the holes 313c and the through holes 314 is cooled by the air flowing through the through holes 314 in addition to the surrounding air, thereby suppressing the temperature rise of the brushes 105aa to 105ca. .

  Further, in the slip ring 310 that rotates together with the rotary shaft 10, the protrusion 312 that rotates together moves away from the outer peripheral surface 311 a toward the downstream side of the flow while turning in the rotation direction P on the outer peripheral surface 311 a of the main body 311. Generates a spiral air flow that flows in a continuous manner. The air flow cools the brushes 105aa to 105ca and the main body 311 whose heat dissipation is improved by the protrusions 312, and wears out from the contact surfaces of the brushes 105aa to 105ca with the outer peripheral surface 311a. Powder is blown away by the air flow generated by the protrusions 312.

Also, in the other slip rings, as in the case of the slip ring 310, the abrasion powder on the contact surface of each brush is discharged to the outside of the slip ring mechanism 100 through the holes and through holes of the hole group of the slip ring. . Furthermore, the air flow generated by the protrusions cools the slip rings and the brushes whose heat dissipation is improved by the holes and the protrusions, and the wear powder around the contact surfaces of the brushes with the slip rings is removed. (See Figure 1)
Moreover, since the other structure and operation | movement of the rotary electric machine which concern on Embodiment 3 of this invention are the same as that of Embodiment 1, description is abbreviate | omitted.

And according to the rotary electric machine in Embodiment 3, the effect similar to the rotary electric machine 1 of the said Embodiment 1 is acquired.
In the rotating electrical machine of the third embodiment, a plurality of holes 313c are provided along the circumferential direction of the outer peripheral surface 311a and a plurality are provided along the axial direction of the rotating shaft 10, and the rotating shaft 10 is provided in the contact region 311aa. At least one hole group 313 is formed in which a plurality of hole rows 313a and 313b are arranged close to each other by holes 313c arranged in the axial direction. At this time, by arranging a plurality of holes 313c including a plurality of hole rows 313a and 313b in the hole group 313, the diameter of each hole 313c can be reduced, and an opening by the hole 313c in the hole group 313 is formed. It can be evenly arranged. Accordingly, in the brushes 105aa to 105ca that are in contact with the outer peripheral surface 311a of the slip ring 310 while sliding, a large number of holes 313c having a small diameter are arranged in the hole group 313, whereby the brushes 105aa to 105ca to the holes 313c are arranged. Since the surface pressure is reduced, wear caused by cutting by the holes 313c is reduced, and furthermore, the openings of the holes 313c are evenly arranged, so that the wear of the contact surface due to sliding with the holes 313c is substantially uniform. Become.

  In the first and third embodiments, the holes 113 and 313c formed on the outer peripheral surfaces of the main bodies 111 and 311 of the slip rings 110 and 310 have a circular cross section, but are not limited thereto. It may have a cross section such as an ellipse, a long hole, or a polygon. Further, when the holes 113 and 313c have a cross section such as an ellipse or a long hole, when the cross section has a long side and a short side, the long side is the circumferential direction of the outer peripheral surface of the body of the slip ring. , And may extend in either the direction of the central axis C or the direction inclined from the central axis C.

  In the first and third embodiments, the through-holes 114 and 314 communicating with the holes 113 and 313c formed on the outer peripheral surface of the main bodies 111 and 311 of the slip rings 110 and 310 are formed. Without being limited thereto, the through holes 114 and 314 may terminate in the middle of the main bodies 111 and 311. In this case, since negative pressure is generated on both side surfaces of the main bodies 111 and 311 due to the air flow generated by the protrusions 112 and 311 when the main bodies 111 and 311 are rotated, negative pressure is also generated in the holes 113 and 313c. The wear powder of each brush 105aa to 105ca is sucked into the holes 113 and 313c and discharged to the outside of the main bodies 111 and 311.

In the first to third embodiments, the protrusions 112 to 312 are formed on both sides of the contact regions 111aa to 311aa in the main bodies 111 to 311 of the slip rings 110 to 310, but the present invention is not limited thereto. It may be only on one side of the contact areas 111aa to 311aa.
In the first to third embodiments, three slip rings are provided in the slip ring mechanism 100. However, the present invention is not limited to this, and there are four or more slip rings even if there are two or less. It may be. Further, the number of brushes that contact each slip ring is not limited to three, and may be two or less or four or more.

Moreover, in Embodiment 1-3, although the slip ring was used as an electrical machinery connection part, it is not limited to this. The electric machine connecting portion may be anything that contacts the brush while rotating, and may be a commutator or the like.
In the first to third embodiments, the rotary electric machine is a double rotor type rotary electric machine. However, the present invention is not limited to this, and it is sufficient if there is at least one rotor.

  DESCRIPTION OF SYMBOLS 1 Rotating electric machine, 10 Rotating shaft, 105, 106, 107 Brush device, 105aa-105ca Brush, 110, 120, 130, 210, 310 Slip ring (electrical connection part), 111a, 211a, 311a Outer peripheral surface (electrical connection part Contact surface), 111aa, 211aa, 311aa contact area, 111ab, 211ab, 311ab non-contact area, 111b, 111c, 211b, 211c, 311b, 311c side surface (side surface of electrical connection part), 112, 212, 312 protrusion, 113, 313c hole (first opening), 114, 314 through hole (second opening), 213 groove, 313 hole group (opening group), 313a, 313b hole row (first opening row), C central axis (Rotation center axis).

Claims (10)

A rotatable rotating shaft;
An electrical connection having an outer peripheral surface that rotates with the rotating shaft and contacts the brush while rotating;
The outer peripheral surface extends in the circumferential direction around the rotation center axis of the electrical connection portion,
The outer peripheral surface includes a contact area that contacts the brush when the electrical connection portion rotates, and a non-contact area that does not contact the brush regardless of whether the electrical connection portion rotates or not.
The electrical connection portion is
With opening at front Kise' touch region, a first opening for collecting the abrasion powder generated by contact with the brush and the electrical connection portion,
It possesses a projection provided in front Kihi contact area,
The protrusion is a rotating electrical machine that protrudes from the outer peripheral surface in a direction opposite to a rotation direction of the electrical connection portion . A plurality of the first openings are provided along the circumferential direction of the outer peripheral surface,
2. The rotating electrical machine according to claim 1, wherein the plurality of first openings include the first openings having different positions in the axial direction of the rotary shaft. The rotating electrical machine according to claim 2, wherein the first openings adjacent to each other in the circumferential direction of the outer peripheral surface are different from each other in the axial direction of the rotating shaft. The electrical connection portion has a second opening on a side surface facing the axial direction of the rotary shaft,
The rotating electrical machine according to claim 1, wherein the second opening communicates with the first opening.   5. The rotating electrical machine according to claim 4, wherein the second opening forms a hole penetrating the electrical connection portion in an axial direction of the rotating shaft. A plurality of the first openings are provided along the circumferential direction of the outer peripheral surface and a plurality are provided along the axial direction of the rotating shaft,
6. The contact area according to claim 1, wherein at least one opening group in which a plurality of rows of the first openings arranged along the axial direction of the rotating shaft are arranged close to each other is formed. The rotating electrical machine according to one item. The first opening is a hole that opens in an area smaller than a contact area of the brush with the outer peripheral surface and extends from the outer peripheral surface toward the rotating shaft. The rotating electrical machine according to one item. 6. The rotating electrical machine according to claim 4, wherein the first opening and the second opening integrally form a groove extending in an axial direction of the rotating shaft and opening at the outer peripheral surface. The groove is recessed toward the rotating shaft, and an opening width in the circumferential direction of the outer peripheral surface is narrower than a circumferential width of a contact surface of the brush with respect to the outer peripheral surface. 8. The rotating electrical machine according to 8. The projections, the rotary electric machine according to any one of the outer peripheral surface of the circumferential claim that provided in plural along the 1-9.

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