WO2025022660A1 - 回転電機 - Google Patents

回転電機 Download PDF

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Publication number
WO2025022660A1
WO2025022660A1 PCT/JP2023/027602 JP2023027602W WO2025022660A1 WO 2025022660 A1 WO2025022660 A1 WO 2025022660A1 JP 2023027602 W JP2023027602 W JP 2023027602W WO 2025022660 A1 WO2025022660 A1 WO 2025022660A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
hole
joint
inner circumferential
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/027602
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
遼 晦日
齋藤　勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Mitsubishi Electric Industrial Systems Corp
Original Assignee
Toshiba Mitsubishi Electric Industrial Systems Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Mitsubishi Electric Industrial Systems Corp filed Critical Toshiba Mitsubishi Electric Industrial Systems Corp
Priority to PCT/JP2023/027602 priority Critical patent/WO2025022660A1/ja
Priority to JP2023578138A priority patent/JP7748485B2/ja
Publication of WO2025022660A1 publication Critical patent/WO2025022660A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports

Definitions

  • the present invention relates to a rotating electric machine.
  • rotating electric machines that include a rotor, a stator, and a housing that houses the rotor and the stator.
  • Pressure-resistant explosion-proof motors which are one type of rotating electric machine, are designed to prevent sparks from reaching the outside of the housing in the event of an explosion inside the rotating electric machine, for example.
  • One example of the problem that this invention solves is to provide a rotating electric machine that can further improve pressure resistance and explosion proofing.
  • a rotating electric machine includes a stator, a rotor, a shaft, and a housing.
  • the rotor is rotatable inside the stator.
  • the shaft is rotatable together with the rotor.
  • the housing has a frame, a bracket, and a terminal member electrically connectable to the stator.
  • the frame has a first inner circumferential surface, a second inner circumferential surface, a first joint surface, and a support portion.
  • the first inner circumferential surface penetrates the frame in a first direction, which is a direction toward the outside of the housing in the axial direction of the shaft, and forms a first through hole in which the stator and the rotor are housed.
  • the second inner circumferential surface penetrates the frame in a direction intersecting the first direction and forms a second through hole in which the terminal member is housed.
  • the first joint surface is connected to an end of the first inner circumferential surface in the first direction and faces the first direction.
  • the support portion protrudes from the second inner circumferential surface and supports the terminal member.
  • the bracket has a second joint surface facing the first joint surface and a protrusion, and closes the end of the frame in the first direction.
  • the protrusion protrudes from the second joint surface in a second direction opposite to the first direction and is fitted into the first through hole.
  • the protrusion has an outer peripheral surface facing the first inner peripheral surface, and overlaps with the support portion in a direction intersecting the first direction.
  • the rotating electric machine of the present invention can provide a rotating electric machine with even greater pressure resistance and explosion-proofing.
  • FIG. 1 is a cross-sectional view that illustrates a rotating electric machine according to the present embodiment.
  • FIG. 2 is a cross-sectional view showing the frame, bracket, and terminal board of the present embodiment.
  • FIG. 1 is a cross-sectional view showing a rotating electric machine 1 according to this embodiment.
  • the rotating electric machine 1 according to this embodiment is, for example, a pressure-resistant explosion-proof motor.
  • the rotating electric machine 1 is not limited to this, and may be, for example, another rotating electric machine such as a generator.
  • the rotating electric machine 1 includes a stator 11, a shaft 12, a rotor 13, a housing 14, two bearings 15, a terminal box 16, and a number of cables 17.
  • the stator 11 has a stator core 111 and a stator winding 112.
  • the stator core 111 is fixed to the housing 14.
  • the stator core 111 is located radially outside the rotor 13 and is formed in a cylindrical shape surrounding the rotor 13.
  • the stator winding 112 passes through multiple slots (not shown) formed in the stator core 111 so as to extend in the axial direction, and is fixed to the stator core 111.
  • the shaft 12 is supported by the housing 14 via two bearings 15 so as to be rotatable around a rotation axis Ax surrounded by the stator 11.
  • the two bearings 15 support the shaft 12 so as to be rotatable relative to the housing 14.
  • the rotation axis Ax is, for example, the central axis (center line) of the shaft 12. Note that the rotation axis Ax may be different from the central axis of the shaft 12.
  • the axial direction is the direction along the rotation axis Ax.
  • the radial direction is the direction perpendicular to the rotation axis Ax.
  • the circumferential direction is the direction around the rotation axis Ax.
  • the axial direction, radial direction, and circumferential direction are the axial direction, radial direction, and circumferential direction of the rotation axis Ax.
  • the shaft 12 extends axially along the rotation axis Ax so as to penetrate the housing 14.
  • the portion of the shaft 12 between both axial ends 12a is housed in the housing 14.
  • both axial ends 12a of the shaft 12 protrude from the housing 14 to the outside.
  • Both ends 12a of the shaft 12 are connected to, for example, various external devices. As a result, the external devices are driven by the rotation of the shaft 12.
  • the rotor 13 is formed in a generally cylindrical shape extending in the axial direction, and is disposed generally concentrically with the stator 11.
  • the rotor 13 is disposed inside the stator 11 with a gap between them.
  • the rotor 13 has, for example, multiple permanent magnets.
  • the rotor 13 is attached to the portion of the shaft 12 between both axial ends 12a. Therefore, the rotor 13 rotates integrally with the shaft 12.
  • the stator 11 and rotor 13 are not limited to the above configuration as long as they can generate rotational force by electromagnetic force.
  • the rotor 13 may have a rotor core made of a magnetic material and a conductor attached to the rotor core.
  • the housing 14 is formed, for example, in a box shape from metal. However, the housing 14 may be formed from other materials.
  • the housing 14 houses the stator 11, a portion of the shaft 12, and the rotor 13.
  • the housing 14 has a frame 21, two brackets 22, two oil throwers 23, two terminal plates 24, a first bolt 25, a second bolt 26, and a third bolt 27.
  • the terminal plate 24 is an example of a terminal member.
  • a space 30 is provided inside the housing 14.
  • the space 30 is a generally cylindrical space extending in the axial direction.
  • the space 30 is surrounded by the frame 21 and the two brackets 22. Note that the space 30 is not limited to being cylindrical, and may be of other shapes.
  • the frame 21 is formed in a generally cylindrical shape extending in the axial direction, and surrounds the stator 11, the rotor 13, and the space 30. In other words, the frame 21 is disposed generally concentrically with the stator 11 and the rotor 13, and is fixed to the stator 11. Note that the frame 21 is not limited to being cylindrical, and may be of other shapes.
  • the frame 21 has protrusions 211.
  • the protrusions 211 protrude in the radial direction from the outer surface 21a, which is the surface of the frame 21 facing the outside.
  • the protrusions 211 are positioned axially spaced apart from each other.
  • the protruding portion 211 has two through holes 31.
  • the through holes 31 are holes that penetrate the protruding portion 211 in the radial direction. In other words, the through holes 31 penetrate the frame 21 in the radial direction to communicate the space 30 with the outside of the housing 14.
  • the two through holes 31 are arranged spaced apart from each other in the axial direction.
  • the through hole 31 has a first hole portion 31a and a second hole portion 31b.
  • the through hole 31 is an example of a second through hole.
  • the first hole portion 31a and the second hole portion 31b are parts of the through hole 31.
  • the inner diameter of the first hole portion 31a is slightly larger than the inner diameter of the second hole portion 31b. This forms a step in the through hole 31.
  • the brackets 22 are formed in the shape of plates that intersect with the axial direction.
  • the two brackets 22 are connected to both ends 21b of the frame 21 in the axial direction, for example, by first bolts 25. In this way, the brackets 22 close both ends 21b of the frame 21.
  • FIG. 2 is a cross-sectional view showing the frame 21, bracket 22, and terminal board 24 of this embodiment.
  • FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 1.
  • the bracket 22 has a protrusion 221.
  • the protrusion 221 protrudes from the inner surface of the bracket 22 that faces the space 30 along the axial direction toward the center of the rotating electric machine 1.
  • the protrusion 221 of one bracket 22 protrudes from the inner surface of that bracket 22 toward the other bracket 22.
  • the length of the protrusion 221 is such that it does not cover the second hole 31b of the frame 21.
  • the length of the protrusion 221 is not limited to this.
  • the length of the protrusion 221 may be such that it does not completely block at least the second hole 31b of the frame 21.
  • an opening 32 is provided in the bracket 22.
  • the opening 32 opens in the axial direction in the bracket 22.
  • the opening 32 connects the outside of the housing 14 to the space 30.
  • the opening 32 does not have to connect the outside of the housing 14 to the space 30 by itself.
  • the opening 32 may be provided in the middle of a passage that connects the outside of the housing 14 to the space 30 by itself.
  • the shaft 12 is arranged to pass through the opening 32. In other words, the shaft 12 passes through the bracket 22 in the axial direction.
  • the oil throwers 23 are formed in a plate shape that intersects with the axial direction.
  • the two oil throwers 23 are located inside the housing 14 relative to the brackets 22.
  • Each oil thrower 23 is connected to the corresponding bracket 22 by a second bolt 26.
  • Each oil thrower 23 is provided with an opening 33.
  • the opening 33 opens the oil thrower 23 in the axial direction.
  • the opening 33 is provided approximately concentrically with the opening 32 of the bracket 22.
  • the shaft 12 is positioned so as to pass through the opening 33. In other words, the shaft 12 passes through the oil thrower 23 in the axial direction.
  • a bearing chamber 34 is provided between the bracket 22 and the oil thrower 23 connected to the bracket 22.
  • the bearing chamber 34 communicates with the opening 32 of the bracket 22 and the opening 33 of the oil thrower 23.
  • the two bearings 15 are provided in the bearing chamber 34.
  • the two bearings 15 are attached to the bracket 22, for example, in the bearing chamber 34.
  • the bearings 15 support the shaft 12 so that it can rotate around the rotation axis Ax.
  • An oil passage 35 is provided in each of the two brackets 22.
  • the oil passage 35 connects the bearing chamber 34 to the outside of the housing 14.
  • the bearing chamber 34 can be supplied with lubricant through the oil passage 35.
  • the terminal board 24 is, for example, a member that can be electrically connected to the stator 11.
  • the terminal board 24 is housed in the through hole 31.
  • the terminal board 24 has a cover 241 and a plurality of terminals 242.
  • the cover 241 is formed in a plate shape and is connected to the frame 21 by a third bolt 27.
  • the terminals 242 are, for example, conductors that pass through the cover 241. In this embodiment, the multiple terminals 242 are electrically connected to the terminal box 16.
  • the terminal box 16 is formed in a box shape, for example, from metal.
  • the terminal box 16 may be formed from other materials.
  • the terminal box 16 is located outside the housing 14. Therefore, the terminal box 16 is electrically connected to the stator 11 via a plurality of terminals 242.
  • the cable 17 electrically connects, for example, the stator winding 112 and sensors arranged in the space 30 to the multiple terminals 242.
  • the terminal box 16 is electrically connected to the stator winding 112 and sensors arranged in the space 30 via the multiple terminals 242 and the cable 17.
  • the frame 21, bracket 22, oil thrower 23, and terminal plate 24 are joined together by a spigot joint.
  • a spigot joint is also called a spigot joint.
  • a protrusion or plug on one member is fitted into a recess or hole on the other member.
  • the frame 21, bracket 22, oil thrower 23, and terminal plate 24 may also be joined together by other methods.
  • the housing 14 further has an inner surface 40.
  • the inner surface 40 is the surface of the housing 14 that faces the space 30. In other words, the inner surface 40 faces the inside of the housing 14.
  • the inner surface 40 forms (or may be expressed as defining or partitioning) the space 30. In other words, the inner surface 40 is the surface of the housing 14 that is exposed to the space 30.
  • the inner surface 40 includes parts of the frame 21, bracket 22, oil cutter 23, and terminal board 24. Therefore, the inner surface 40 has a partial inner surface 41 included in the frame 21, a partial inner surface 42 included in the bracket 22, a partial inner surface 43 included in the oil cutter 23, and a partial inner surface 44 included in the terminal board 24. Each of the partial inner surfaces 41 to 44 is part of the inner surface 40, and forms (defines or partitions) a part of the space 30.
  • the frame 21 has a through hole 50.
  • the through hole 50 penetrates the frame 21 in the axial direction.
  • the through hole 50 has a space 30 and two fitting holes 51.
  • the two fitting holes 51 are provided at both axial ends 21b of the through hole 50.
  • the space 30 is located between the two fitting holes 51.
  • the two fitting holes 51 are holes that communicate between the space 30 and the outside of the housing 14.
  • the through hole 50 is an example of a first through hole.
  • the through hole 50 is part of the space inside the frame 21.
  • the through hole 50 can be expressed as penetrating the end 21b of the frame 21 in the axial direction.
  • the space inside the frame 21 includes the space 30 and the through hole 50. Therefore, the through hole 50 can be expressed as accommodating the stator 11, part of the shaft 12, and the rotor 13.
  • the axial direction is an example of the first direction. In other words, the first direction is the direction toward the outside of the housing 14.
  • the frame 21 further has an inner circumferential surface 52, a joint surface 53, and a stepped surface 54.
  • the inner circumferential surface 52 is an example of a first inner circumferential surface
  • the joint surface 53 is an example of a first joint surface
  • the stepped surface 54 is an example of a first surface.
  • the inner circumferential surface 52 is a generally cylindrical curved surface extending in the axial direction.
  • the inner circumferential surface 52 forms (defines or defines) at least a portion of the through hole 50.
  • the inner circumferential surface 52 faces inward in the radial direction. In other words, the inner circumferential surface 52 faces toward the inside of the through hole 50.
  • the radial direction is an example of a direction that intersects with the first direction.
  • the joint surface 53 is provided, for example, at the end 21b of the frame 21 in the axial direction.
  • the joint surface 53 may be provided at another position.
  • the joint surface 53 is connected to the end of the inner circumferential surface 52 at the outer side Dxo in the axial direction.
  • the outer side Dxo in the axial direction is a direction toward the outside of the housing 14 in the axial direction and is included in the axial direction.
  • the outer side Dxo in the axial direction is an example of the first direction.
  • the joining surface 53 is, for example, a substantially annular plane extending radially outward from the end of the inner circumferential surface 52.
  • the joining surface 53 faces the axially outward direction Dxo.
  • the axially outward direction Dxo is perpendicular to the direction in which the inner circumferential surface 52 faces.
  • the joining surface 53 may face in another direction that intersects with the direction in which the inner circumferential surface 52 faces.
  • a bolt hole 55 is provided in the joint surface 53.
  • a bolt hole 55 that opens at the joint surface 53 is provided in the frame 21.
  • the bolt hole 55 extends in the axial direction from the joint surface 53.
  • a female thread is formed on the inner surface of the bolt hole 55. The female thread of the bolt hole 55 can fit onto the male thread of the first bolt 25.
  • the stepped surface 54 is provided, for example, at a position spaced from the joint surface 53 toward the axially inward direction Dxi.
  • the axially inward direction Dxi is a direction toward the inside of the housing 14 in the axial direction and is included in the axial direction.
  • the axially inward direction Dxi is the opposite direction to the axially outward direction Dxo and is an example of the second direction.
  • One end 54a of the stepped surface 54 in the radial direction is connected to the axially inner end Dxi of the inner circumferential surface 52.
  • the stepped surface 54 is connected to the edge 41a of the partial inner surface 41 of the frame 21.
  • the other end 54b of the stepped surface 54 in the radial direction is located on the opposite side to the end 54a.
  • the stepped surface 54 is, for example, a substantially annular plane extending radially inward from the end of the inner circumferential surface 52.
  • the stepped surface 54 faces outward in the axial direction Dxo. Therefore, the stepped surface 54 intersects with the axial direction.
  • the stepped surface 54 may face in another direction that intersects with the direction in which the inner circumferential surface 52 faces.
  • the direction in which the stepped surface 54 faces may be different from the direction in which the joining surface 53 faces.
  • the length of the stepped surface 54 in the radial direction is shorter than the length of the inner circumferential surface 52 in the axial direction. In other words, the distance between the end 54a and the end 54b of the stepped surface 54 is shorter than the distance between the joint surface 53 and the stepped surface 54.
  • the protrusion 221 of the bracket 22 is formed in a roughly cylindrical shape and is fitted into the fitting opening 51, which is part of the through hole 50.
  • the fitting opening 51 is a part of the internal space of the frame 21 into which the protrusion 221 is fitted.
  • the protrusion 221 has an outer peripheral surface 61 and an end surface 62.
  • the end surface 62 is an example of the second surface.
  • the outer peripheral surface 61 is a generally cylindrical curved surface extending in the axial direction.
  • the diameter of the outer peripheral surface 61 is equal to or slightly shorter than the diameter of the inner peripheral surface 52.
  • the length of the outer peripheral surface 61 is generally equal to the length of the inner peripheral surface 52.
  • the outer peripheral surface 61 faces radially outward. In other words, the outer peripheral surface 61 faces the inner peripheral surface 52.
  • the outer peripheral surface 61 may be in contact with the inner peripheral surface 52, or may be slightly spaced apart from the inner peripheral surface 52.
  • the outer peripheral surface 61 and the inner peripheral surface 52 are disposed approximately concentrically and approximately parallel to each other.
  • the end face 62 is provided at the end of the protrusion 221 on the inner side Dxi in the axial direction.
  • the end face 62 is the end face of the protrusion 221 on the inner side Dxi in the axial direction.
  • the end face 62 may be provided at another position.
  • One end 62a of the end face 62 in the radial direction is connected to the axially inner end Dxi of the outer peripheral surface 61.
  • the end 62b is connected to the edge 42a of the partial inner surface 42 of the bracket 22.
  • the other end 62b of the end face 62 in the radial direction is located on the opposite side to the end 62a.
  • the end face 62 is, for example, a substantially annular plane extending radially inward from the end of the outer peripheral surface 61.
  • the end face 62 faces inward in the axial direction Dxi. Therefore, the end face 62 intersects with the axial direction. Note that the end face 62 may face in another direction that intersects with the direction in which the inner peripheral surface 52 faces.
  • the end face 62 faces the stepped surface 54.
  • the end face 62 may be in contact with the stepped surface 54 or may be slightly spaced apart from the stepped surface 54.
  • the end face 62 and the stepped surface 54 are arranged substantially concentrically and substantially parallel to each other.
  • the bracket 22 further has a flange 222.
  • the flange 222 protrudes radially outward from the protrusion 221 and covers the joint surface 53 of the frame 21.
  • the flange 222 has a joint surface 63.
  • the joint surface 63 is an example of a second joint surface.
  • the joint surface 63 is provided, for example, at the end of the flange 222 on the inner side Dxi in the axial direction.
  • the joint surface 63 may be provided at another position.
  • the joint surface 63 is connected to the end of the outer peripheral surface 61 on the outer side Dxo in the axial direction.
  • the joint surface 63 is, for example, a substantially annular plane extending radially outward from the end of the outer circumferential surface 61 of the protrusion 221.
  • the joint surface 63 faces inward in the axial direction Dxi.
  • the protrusion 221 protrudes from the joint surface 63 toward the inner axial direction Dxi.
  • the joint surface 63 may face in another direction that intersects with the direction in which the inner circumferential surface 52 faces.
  • the joint surface 63 faces the joint surface 53 of the frame 21.
  • the joint surface 63 may be in contact with the joint surface 53, or may be slightly spaced apart from the joint surface 53.
  • the joint surface 63 and the joint surface 53 are disposed approximately concentrically and approximately parallel to each other.
  • the length of the end face 62 in the radial direction is shorter than the length of the outer peripheral surface 61 in the axial direction. In other words, the distance between the end 62a and the end 62b of the end face 62 is shorter than the distance between the joint surface 63 and the end face 62.
  • a through hole 64 is provided in the joint surface 63.
  • the bracket 22 is provided with a through hole 64 that opens at the joint surface 63.
  • the through hole 64 passes through the flange 222 in the axial direction.
  • the through hole 64 has a diameter that allows the first bolt 25 to pass through the inside of the through hole 64.
  • the through hole 64 is connected to the bolt hole 55.
  • the first bolt 25 is inserted from outside the housing 14 through the through hole 64 of the bracket 22 and into the bolt hole 55 of the frame 21. In other words, the first bolt 25 fits into the through hole 64 and the bolt hole 55. In this way, the first bolt 25 connects the frame 21 and the bracket 22 to each other.
  • the stepped surface 54 of the frame 21 is connected to the edge 41a of the partial inner surface 41. Furthermore, the end surface 62 of the bracket 22 is connected to the edge 42a of the partial inner surface 42. In other words, the stepped surface 54 and the end surface 62 are connected to the inner surface 40.
  • the partial inner surface 41 faces radially inward at the edge 41a.
  • the partial inner surface 42 faces radially inward at the edge 42a.
  • the edge 41a of the partial inner surface 41 and the edge 42a of the partial inner surface 42 are in approximately the same position in the radial direction. Therefore, the partial inner surface 41 and the partial inner surface 42 form a substantially continuous surface.
  • the frame 21 further has an inner circumferential surface 71, a joint surface 72, a first stepped surface 73, and a second stepped surface 74.
  • the inner circumferential surface 71 is a generally cylindrical surface extending in the radial direction.
  • the inner circumferential surface 71 forms (defines or defines) a portion of the through hole 31.
  • the inner circumferential surface 71 faces inward of the through hole 31.
  • the inner circumferential surface 71 is an example of a second inner circumferential surface.
  • the joint surface 72 is connected to the end of the inner circumferential surface 71 at the radially outer side Dro.
  • the radially outer side Dro is a direction toward the outside of the housing 14 in one of the multiple radial directions in which the through hole 31 extends.
  • the radially outer side Dro is included in the radial directions. Note that the radially outer side Dro is an example of a direction that intersects with the first direction.
  • the joining surface 72 is, for example, a substantially annular plane extending from the end of the inner circumferential surface 71 in a direction perpendicular to the radial direction.
  • the joining surface 72 faces the radially outer side Dro.
  • the radially outer side Dro is perpendicular to the direction in which the inner circumferential surface 71 faces.
  • the joining surface 72 may face in another direction that intersects with the direction in which the inner circumferential surface 71 faces.
  • a bolt hole 75 is provided in the joint surface 72.
  • the frame 21 is provided with a bolt hole 75 that opens at the joint surface 72.
  • the bolt hole 75 extends radially from the joint surface 72.
  • a female thread is formed on the inner surface of the bolt hole 75. The female thread of the bolt hole 75 can fit onto the male thread of the third bolt 27.
  • the first stepped surface 73 is provided, for example, at a position spaced from the joint surface 72 to the radially inner side Dri.
  • the radially inner side Dri is a direction toward the inside of the housing 14 in the one radial direction in which the through hole 31 extends among the multiple radial directions.
  • the radially inner side Dri is included in the radial direction.
  • the radially inner side Dri is the opposite direction to the radially outer side Dro.
  • the radially inner side Dri is an example of a direction that intersects with the first direction.
  • One end 73a of the first stepped surface 73 in a direction perpendicular to the radial direction is connected to the radially inner end Dri of the inner circumferential surface 71.
  • the other end 73b of the first stepped surface 73 in a direction perpendicular to the radial direction is connected to the second stepped surface 74.
  • End 73b is located on the opposite side of end 73a.
  • the first stepped surface 73 is, for example, a substantially annular plane extending from the end of the inner circumferential surface 71 in a direction perpendicular to the radial direction.
  • the first stepped surface 73 faces the radially outward direction Dro. Therefore, the first stepped surface 73 intersects with the radial direction.
  • the first stepped surface 73 may face in another direction that intersects with the direction in which the inner circumferential surface 71 faces.
  • the direction in which the first stepped surface 73 faces may be different from the direction in which the joining surface 72 faces.
  • the length of the first stepped surface 73 in a direction perpendicular to the radial direction is shorter than the length of the inner peripheral surface 71 in the radial direction. In other words, the distance between the end 73a and the end 73b of the first stepped surface 73 is shorter than the distance between the joining surface 72 and the first stepped surface 73.
  • the second stepped surface 74 is a generally cylindrical surface that extends radially inward Dri from the first stepped surface 73.
  • the second stepped surface 74 forms (defines or defines) a portion of the through hole 31.
  • the second stepped surface 74 faces the inside of the through hole 31.
  • the end 74a of the radially outer Dro of the second stepped surface 74 is connected to the end 73b of the first stepped surface 73.
  • the second stepped surface 74 is connected to the edge 41b of the partial inner surface 41 of the frame 21.
  • the end 74b of the radially inner Dri of the second stepped surface 74 is located opposite the end 74a.
  • the length of the second stepped surface 74 in the radial direction is shorter than the length of the inner peripheral surface 71 in the radial direction. In other words, the distance between the end 74a and the end 74b of the second stepped surface 74 is shorter than the distance between the joining surface 72 and the first stepped surface 73.
  • the frame 21 further has a step 76.
  • the step 76 protrudes from the inner circumferential surface 71 and supports the terminal board 24.
  • the step 76 is spaced radially inwardly Dri from the joining surface 72.
  • the first stepped surface 73 and the second stepped surface 74 are provided on the step 76.
  • the step 76 is an example of a support portion.
  • the surface facing radially inward is the inner circumferential surface 52. Therefore, the stepped surface 54 can be described as, for example, a substantially annular plane extending from the surface facing the radially inward Dri of the step 76 to the radially inward Dri.
  • the end face 62 overlaps with the step 76 in the axial direction.
  • the protrusion 221 overlaps with the step 76 in the axial direction. This increases the length of the outer circumferential surface 61 in the axial direction.
  • the cover 241 of the terminal board 24 has a plug portion 243 and a flange 244.
  • the plug portion 243 is formed in a generally columnar shape and is fitted into the through hole 31. As a result, the plug portion 243 closes the through hole 31.
  • the plug portion 243 has an outer peripheral surface 81, a first stepped surface 82, and a second stepped surface 83.
  • the outer peripheral surface 81 is a generally cylindrical surface extending in the radial direction.
  • the size of the outer peripheral surface 81 is equal to or slightly smaller than the size of the inner peripheral surface 71.
  • the length of the outer peripheral surface 81 is generally equal to the length of the inner peripheral surface 71.
  • the outer peripheral surface 81 faces the inner peripheral surface 71.
  • the outer peripheral surface 81 may be in contact with the inner peripheral surface 71, or may be slightly spaced apart from the inner peripheral surface 71.
  • the outer peripheral surface 81 and the inner peripheral surface 71 are disposed approximately parallel to each other.
  • One end 82a of the first stepped surface 82 in a direction perpendicular to the radial direction is connected to the end of the outer peripheral surface 81 on the radially inner side Dri.
  • the other end 82b of the first stepped surface 82 in a direction perpendicular to the radial direction is connected to the second stepped surface 83.
  • the first stepped surface 82 is, for example, a substantially annular plane extending from the end of the outer peripheral surface 81.
  • the first stepped surface 82 faces inward in the radial direction Dri. Therefore, the first stepped surface 82 intersects with the radial direction. Note that the first stepped surface 82 may face in another direction that intersects with the direction in which the inner peripheral surface 71 faces.
  • the first stepped surface 82 faces the first stepped surface 73 of the frame 21.
  • the first stepped surface 82 may be in contact with the first stepped surface 73 or may be slightly spaced apart from the first stepped surface 73.
  • the first stepped surfaces 73, 82 of the frame 21 and the cover 241 are arranged approximately parallel to each other.
  • the second stepped surface 83 is a generally cylindrical surface extending radially inwardly from the first stepped surface 82.
  • the end 83a of the radially outer side Dro of the second stepped surface 83 is connected to the end 82b of the first stepped surface 82.
  • the second stepped surface 83 is connected to the edge 44a of the partial inner surface 44 of the terminal board 24.
  • the end 83b of the radially inner side Dri of the second stepped surface 83 is located opposite the end 83a.
  • the second stepped surface 83 faces the second stepped surface 74 of the frame 21.
  • the second stepped surface 83 may be in contact with the second stepped surface 74 or may be slightly spaced apart from the second stepped surface 83.
  • the second stepped surfaces 74, 83 of the frame 21 and the cover 241 are arranged approximately parallel to each other.
  • the flange 244 protrudes radially outward from the plug portion 243 and covers the joint surface 72 of the frame 21.
  • the flange 244 has a joint surface 84.
  • the joint surface 84 is provided, for example, at the end of the flange 244 on the radial inner side Dri.
  • the joint surface 84 may be provided at another position.
  • the joint surface 84 is connected to the end of the outer peripheral surface 81 on the radial outer side Dro.
  • the joining surface 84 is, for example, a substantially annular plane extending from the end of the outer peripheral surface 81.
  • the joining surface 84 faces inward in the radial direction Dri.
  • the joining surface 84 may also face in another direction that intersects with the direction in which the inner peripheral surface 71 faces.
  • the joint surface 84 faces the joint surface 72 of the frame 21.
  • the joint surface 84 may be in contact with the joint surface 72 or may be slightly spaced apart from the joint surface 72.
  • the joint surface 84 and the joint surface 72 are disposed approximately parallel to each other.
  • the length of the first stepped surface 82 in a direction perpendicular to the radial direction is shorter than the length of the outer peripheral surface 81 in the radial direction.
  • the distance between end 82a and end 82b of the first stepped surface 82 is shorter than the distance between the joining surface 84 and the first stepped surface 82.
  • the distance between end 83a and end 83b of the second stepped surface 83 is shorter than the distance between the joining surface 84 and the first stepped surface 82.
  • a through hole 85 is provided in the joint surface 84.
  • the cover 241 is provided with a through hole 85 that opens at the joint surface 84.
  • the through hole 85 penetrates the flange 244 in the radial direction.
  • the through hole 85 has a diameter that allows the third bolt 27 to pass through the inside of the through hole 85.
  • the through hole 85 is connected to the bolt hole 75.
  • the third bolt 27 is inserted from outside the housing 14 through the through hole 85 of the cover 241 and into the bolt hole 75 of the frame 21. In other words, the third bolt 27 fits into the through hole 85 and the bolt hole 75. In this way, the third bolt 27 connects the frame 21 and the cover 241 to each other.
  • the second stepped surface 74 of the frame 21 is connected to the edge 41a of the partial inner surface 41. Furthermore, the second stepped surface 83 of the terminal board 24 is connected to the edge 44a of the partial inner surface 44. Therefore, the second stepped surfaces 74, 83 are connected to the inner surface 40.
  • the partial inner surface 41 faces the radially inward Dri at the edge 41a.
  • the partial inner surface 44 faces the radially inward Dri at the edge 44a.
  • the edge 41a of the partial inner surface 41 and the edge 44a of the partial inner surface 44 are in approximately the same position in the radial direction. Therefore, the partial inner surface 41 and the partial inner surface 44 form a substantially continuous surface.
  • the rotating electric machine 1 which is an explosion-proof motor, can prevent sparks from reaching the outside of the housing 14 even if an explosion occurs in the space 30.
  • the following description will be given of the case where an explosion occurs in the space 30.
  • the rotating electric machine 1 has various configurations that can prevent an explosion from occurring in the space 30.
  • gaps G1, G2, and G3 may be provided between the frame 21 and the bracket 22.
  • Gap G1 is provided between the joint surface 53 and the joint surface 63.
  • Gap G2 is provided between the inner peripheral surface 52 and the outer peripheral surface 61.
  • Gap G3 is provided between the stepped surface 54 and the end surface 62.
  • Gap G1 extends in the radial direction and communicates with the outside of the housing 14. Furthermore, gap G1 communicates with the outside of the housing 14 through the through hole 64. Gap G3 extends in the radial direction and communicates with the space 30. Gap G2 extends in the axial direction and communicates with gaps G1 and G3. Therefore, there is a risk that space 30 will communicate with the outside of the housing 14 through gaps G1, G2, G3 and the through hole 64.
  • the outer peripheral surface 61 of the protrusion 221 overlaps with the step 76 in the radial direction. That is, the length of the outer peripheral surface 61 in the axial direction is increased. This increases the gap G2 between the inner peripheral surface 52 and the outer peripheral surface 61. Therefore, the rotating electric machine 1 makes it easier for sparks to disappear in the gap G2.
  • gaps G4, G5, G6, and G7 may be provided between the frame 21 and the terminal board 24.
  • Gap G4 is provided between the joint surface 72 and the joint surface 84.
  • Gap G5 is provided between the inner peripheral surface 71 and the outer peripheral surface 81.
  • Gap G6 is provided between the first stepped surface 73 and the first stepped surface 82.
  • Gap G7 is provided between the second stepped surface 74 and the second stepped surface 83.
  • Gap G4 extends in a direction perpendicular to the radial direction and communicates with the outside of the housing 14. Furthermore, gap G4 communicates with the outside of the housing 14 through the through hole 85.
  • Gap G7 extends in the radial direction and communicates with the space 30.
  • Gap G5 extends in the radial direction and communicates with gap G4 and gap G6.
  • Gap G6 extends in a direction perpendicular to the radial direction and communicates with gap G5 and gap G7. For this reason, there is a risk that space 30 will communicate with the outside of the housing 14 through gaps G4, G5, G6, G7 and through hole 85.
  • the rotating electric machine 1 can extinguish the sparks in gap G5. Therefore, the rotating electric machine 1 of this embodiment can improve pressure resistance and explosion proofing.
  • the rotating electric machine 1 of this embodiment includes the stator 11, the rotor 13, the shaft 12, and the housing 14.
  • the rotor 13 can rotate inside the stator 11.
  • the shaft 12 can rotate together with the rotor 13.
  • the housing 14 has a frame 21, a bracket 22, and a terminal plate 24 that can be electrically connected to the stator 11.
  • the frame 21 has an inner circumferential surface 52, an inner circumferential surface 71, a joint surface 53, and a step 76.
  • the inner circumferential surface 52 forms a through hole 50 that penetrates the frame 21 on the axial outside Dxo and accommodates the stator 11 and the rotor 13.
  • the inner circumferential surface 71 forms a through hole 31 that penetrates the frame 21 in the radial direction and accommodates the terminal plate 24.
  • the joint surface 53 is connected to an end of the inner circumferential surface 52 on the axial outside Dxo and faces the axial outside Dxo.
  • the step 76 protrudes from the inner circumferential surface 71 and supports the terminal board 24.
  • the bracket 22 has a joint surface 63 facing the joint surface 53 and a protrusion 221, and closes the end 21b of the frame 21 on the axially outer side Dxo.
  • the protrusion 221 protrudes from the joint surface 63 to the axially inner side Dxi and is fitted into the through hole 50. Furthermore, the protrusion 221 has an outer circumferential surface 61 facing the inner circumferential surface 52, and overlaps with the step 76 in the radial direction.
  • the bracket 22 fits into a through hole 50 that penetrates the frame 21 in the axial direction.
  • the terminal board 24 fits into a through hole 31 that penetrates the frame 21 in the radial direction.
  • a gap may occur between the inner circumferential surface 52 and the outer circumferential surface 61, and between the joint surfaces 53 and 63.
  • the gap G1 between the joint surfaces 53 and 63 may communicate with the space 30 through the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61.
  • the direction in which the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61 extends is different from the direction in which the gap G1 between the joint surfaces 53 and 63 extends.
  • the protrusion 221 of this embodiment overlaps with the step 76 of the frame 21 in the radial direction. That is, in this embodiment, the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61 extends to the step 76. This increases the distance of the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61.
  • the rotating electric machine 1 of this embodiment can prevent the sparks from passing through gap G1 between joint surfaces 53 and 63 and reaching the outside of housing 14 by causing a pressure loss due to the collision. Therefore, the rotating electric machine 1 of this embodiment can improve pressure resistance and explosion proof properties.
  • the frame 21 has a stepped surface 54 that extends radially inwardly Dri from the step 76 and faces axially outwardly Dxo.
  • the bracket 22 has an end surface 62 that faces the stepped surface 54.
  • a gap G3 occurs between the stepped surface 54 and the end face 62.
  • the direction in which the gap G3 between the stepped surface 54 and the end face 62 extends is different from the direction in which the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61 extends, and is the same as the direction in which the gap G1 between the joint surfaces 53 and 63 extends.
  • sparks generated by the explosion will enter the gap G3 between the stepped surface 54 and the end face 62, and then pass through the gap G2 between the inner circumferential surface 52 and the outer circumferential surface 61. That is, in the rotating electric machine 1, the provision of the gap G3 between the stepped surface 54 and the end face 62 increases the creepage distance of the gap between the frame 21 and the bracket 22. This allows the rotating electric machine 1 of this embodiment to have improved pressure resistance and explosion proof properties.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2023/027602 2023-07-27 2023-07-27 回転電機 Pending WO2025022660A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2023/027602 WO2025022660A1 (ja) 2023-07-27 2023-07-27 回転電機
JP2023578138A JP7748485B2 (ja) 2023-07-27 2023-07-27 回転電機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/027602 WO2025022660A1 (ja) 2023-07-27 2023-07-27 回転電機

Publications (1)

Publication Number Publication Date
WO2025022660A1 true WO2025022660A1 (ja) 2025-01-30

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Country Status (2)

Country Link
JP (1) JP7748485B2 (https=)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133269U (https=) * 1981-02-14 1982-08-19
JPH09308175A (ja) * 1996-05-13 1997-11-28 Matsushita Electric Ind Co Ltd 電動機のリード線引出装置
JPH114557A (ja) * 1997-06-11 1999-01-06 Yamatake Honeywell Co Ltd 端子箱
JP2013123312A (ja) * 2011-12-09 2013-06-20 Yaskawa Electric Corp 回転電機
JP2014230464A (ja) * 2013-05-27 2014-12-08 株式会社安川電機 回転電機

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008211945A (ja) 2007-02-28 2008-09-11 Hitachi Ltd 車両駆動装置
CN105594104B (zh) * 2013-10-15 2018-03-09 株式会社安川电机 旋转电机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133269U (https=) * 1981-02-14 1982-08-19
JPH09308175A (ja) * 1996-05-13 1997-11-28 Matsushita Electric Ind Co Ltd 電動機のリード線引出装置
JPH114557A (ja) * 1997-06-11 1999-01-06 Yamatake Honeywell Co Ltd 端子箱
JP2013123312A (ja) * 2011-12-09 2013-06-20 Yaskawa Electric Corp 回転電機
JP2014230464A (ja) * 2013-05-27 2014-12-08 株式会社安川電機 回転電機

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JP7748485B2 (ja) 2025-10-02

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