WO2022137416A1 - 電動機 - Google Patents
電動機 Download PDFInfo
- Publication number
- WO2022137416A1 WO2022137416A1 PCT/JP2020/048385 JP2020048385W WO2022137416A1 WO 2022137416 A1 WO2022137416 A1 WO 2022137416A1 JP 2020048385 W JP2020048385 W JP 2020048385W WO 2022137416 A1 WO2022137416 A1 WO 2022137416A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hole
- electric motor
- fan
- bracket
- motor according
- Prior art date
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- 238000009423 ventilation Methods 0.000 claims description 101
- 230000002093 peripheral effect Effects 0.000 claims description 27
- 230000035515 penetration Effects 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 47
- 238000001816 cooling Methods 0.000 description 14
- 230000007423 decrease Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
Definitions
- This disclosure relates to motors.
- the motor includes a shaft, a rotor fixed to the shaft and rotating integrally, and a stator facing the rotor at a radial distance.
- the temperatures of the stator core and stator conductor of the stator and the rotor core and rotor conductor of the rotor rise.
- the temperature of the shaft to which the rotor is attached rises.
- the temperature of the bearing that rotatably supports the shaft and the temperature of the lubricating oil filled in the bearing rise.
- the temperature of the bearing and the lubricating oil rises, the size of the space inside the bearing changes, the lubricant deteriorates, and the like.
- the motor is equipped with a fan that is fixed to the shaft and rotates integrally. Due to the rotation of the fan, the air outside the motor flows into the inside, and flows through the air holes formed in the stator core and the rotor core, the gap between the stator core and the rotor core, and the like. As a result, the stator core, stator conductor, rotor core, rotor conductor and the like are cooled.
- An example of this type of motor is disclosed in Patent Document 1.
- the air that has flowed into the inside due to the rotation of the fan passes through the air holes formed in the stator core and the rotor core, and then flows out to the outside. With this configuration, the stator core, stator conductor, rotor core, and rotor conductor are cooled.
- the air that has flowed into the inside of the motor contains foreign substances such as dust and moisture.
- the dust contains iron powder produced by the friction between the wheels and the rails. If the outside air containing foreign matter comes into contact with the components of the motor such as the stator conductor and the rotor conductor, the motor may fail. Therefore, the motor disclosed in Patent Document 1 passes the air flowing into the inside of the motor through the air holes formed in the stator core and the rotor core without contacting the stator conductor and the rotor conductor. Centrifugal force acts on the foreign matter contained in the air passing through the air hole of the rotor core that rotates integrally with the shaft, so that the foreign matter is pressed against the wall surface of the wind hole.
- the rotor core Since the rotor core is magnetized, the iron powder contained in the foreign matter adheres to the wall surface of the air hole when it is pressed against the wall surface of the air hole.
- the ventilation resistance of the air hole increases, the flow rate of air decreases, and the cooling efficiency of the motor decreases.
- the cooling efficiency of the electric motor is lowered, the stator core, the stator conductor, the rotor core, the rotor conductor, the bearing and the like cannot be sufficiently cooled.
- the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide an electric motor capable of improving the internal cooling efficiency.
- the motor of the present disclosure includes a shaft, a rotor, a stator, a first bracket, a fan, and a cylindrical first guide.
- the shaft is rotatably supported around the axis of rotation.
- the rotor is located radially outside the shaft and rotates integrally with the shaft.
- the stator has a first ventilation path that is a through hole, and is radially opposed to the rotor to form a second ventilation path with the rotor.
- the first bracket has an inflow hole for allowing outside air to flow inside.
- the fan has a first through hole at a position where the main surface faces the first bracket, rotates integrally with the shaft, and faces an inner position in the radial direction from the inflow hole of the first bracket.
- the first guide faces the first bracket.
- the motor according to the present disclosure has a first ventilation passage, a stator forming a second ventilation passage between the rotor and the rotor, and a first through hole radially inside the inflow hole of the first bracket. Since it is equipped with a fan, the cooling efficiency inside the motor is improved.
- FIG. 1 is a cross-sectional view taken along the line AA of the electric motor according to the first embodiment.
- Side view of the electric motor according to the first embodiment Side view of the electric motor according to the first embodiment Partial sectional view of the electric motor according to the first embodiment The figure which shows the air flow in the electric motor which concerns on Embodiment 1.
- FIG. 7 is a cross-sectional view taken along the line BB of the electric motor according to the second embodiment. Sectional drawing of the electric motor which concerns on Embodiment 3.
- FIG. 9 is a cross-sectional view taken along the line CC of the electric motor according to the third embodiment.
- FIG. 15 is a cross-sectional view taken along the line EE of the electric motor according to the sixth embodiment.
- FIG. 15 is a cross-sectional view taken along the line FF of the electric motor according to the sixth embodiment.
- Sectional drawing of the electric motor which concerns on Embodiment 7. Side view of the electric motor according to the seventh embodiment The figure which shows the air flow in the electric motor which concerns on Embodiment 7.
- FIG. 1 shows an electric motor according to the first embodiment.
- the Z axis is in the vertical direction
- the Y axis is parallel to the rotation axis AX of the shaft 11
- the X axis is orthogonal to the Y axis and the Z axis.
- the rotation axis AX is shown by a alternate long and short dash line.
- the motor 1 shown in FIG. 1 includes a shaft 11 rotatably supported around the rotation shaft AX, a rotor 12 located outside the shaft 11 in the radial direction and rotating integrally with the shaft 11, and a rotor 12.
- a stator 13 facing in the radial direction and a fan 14 that rotates integrally with the shaft 11 are provided.
- the motor 1 further includes a first bracket 19 having an inflow hole 19a for allowing external air to flow into the inside. It is preferable that the electric motor 1 includes a second bracket 20 having a first outflow hole 20a that causes the air flowing in from the inflow hole 19a to flow out to the outside.
- the first bracket 19 and the second bracket 20 face each other in the direction of the rotation axis AX.
- the first bracket 19 and the second bracket 20 are located so as to sandwich the rotor 12, the stator 13, and the fan 14.
- the motor 1 further includes a cylindrical first guide 21 facing the first bracket 19.
- the outer peripheral surface of the first guide 21 faces the inner peripheral surface of the first bracket 19.
- the first guide 21 guides the air flowing through the inflow hole 19a and flowing in the radial direction by the rotation of the fan 14 to one end of the first ventilation passage 17a facing the first bracket 19.
- the motor 1 further includes bearings 22 and 23 that rotatably support the shaft 11. Further, it is preferable that the electric motor 1 is provided with a shielding plate 24 that covers the first outflow hole 20a at a position adjacent to the first outflow hole 20a at a distance in the direction of the rotation axis AX.
- One end of the shaft 11 near the first bracket 19 is connected to the axle of the railway vehicle via a joint and a gear (not shown), and the rotation of the shaft 11 causes the railway vehicle to obtain power.
- the rotor 12 has a rotor core 15 fixed to the shaft 11 and a rotor conductor 16 inserted into a groove formed on the outer peripheral surface of the rotor core 15.
- the stator 13 has a stator core 17 and a stator conductor 18 inserted into a groove formed in the stator core 17.
- the stator core 17 has a first ventilation passage 17a that penetrates the stator core 17.
- the first ventilation passage 17a is located radially outside the groove into which the stator conductor 18 is inserted, and extends in the direction of the rotation axis AX.
- the stator core 17 faces the rotor core 15 in the radial direction at a distance from each other to form a second ventilation passage 17b between the stator core 17 and the rotor core 15.
- the main surface of the fan 14 faces the first bracket 19, and the fan 14 rotates integrally with the shaft 11.
- the fan 14 has a first through hole 31c at a position facing an inner position in the radial direction from the inflow hole 19a of the first bracket 19.
- the fan 14 preferably has an annular wing portion 31 fixed to the shaft 11 and having a first through hole 31c, and a first blade portion 32 extending in a direction away from the first main surface 31a. ..
- the first main surface 31a of the wing portion 31 faces the first bracket 19.
- the second main surface 31b on the opposite side of the first main surface 31a faces each of the rotor 12 and the stator 13.
- the first through hole 31c is formed at a position facing the inner position in the radial direction from the inflow hole 19a of the first bracket 19.
- the first blade portion 32 is located radially outside the first through hole 31c and is fixed to the first main surface 31a. Being fixed to the first main surface 31a is formed separately from the wing portion 31, and is fixed to the first main surface 31a of the wing portion 31 by welding, adhesion, etc., and is integrated with the wing portion 31. It shall include being formed in.
- the fan 14 has a plurality of first blade portions 32 located at intervals in the circumferential direction, that is, around the Y axis. ..
- the wing portion 31 has a plurality of first through holes 31c formed at intervals in the circumferential direction.
- the first bracket 19 holds the bearing 22.
- the first bracket 19 has a plurality of inflow holes 19a located at intervals in the circumferential direction.
- the first bracket 19 preferably has an inflow hole 19a at a position facing the first blade portion 32. In other words, it is preferable that the distance from the rotary shaft AX to the first blade portion 32 and the distance from the rotary shaft AX to the inflow hole 19a match.
- the second bracket 20 holds the bearing 23.
- the second bracket 20 has a plurality of first outflow holes 20a located at intervals in the circumferential direction.
- the outer peripheral surface of the second bracket 20 is located inside the first ventilation passage 17a of the stator 13 in the radial direction.
- the description of the shielding plate 24 is omitted in FIG.
- it is preferable that one end of the second bracket 20 facing the outside of the first outflow hole 20a is located below the other end of the first outflow hole 20a in the Z-axis direction.
- the first guide 21 has a cylindrical shape.
- the first guide 21 is fixed to the first bracket 19 by the fixing member 21a.
- the fixing member 21a is fixed to the outer peripheral surface of the first guide 21 and the inner peripheral surface of the first bracket 19.
- the first guide 21 forms a flow path between the inner peripheral surface of the first bracket 19 and guides the air flowing in the radial direction by the rotation of the fan 14 to the first ventilation passage 17a of the stator core 17.
- the first guide 21 preferably forms a labyrinth flow path with the fan 14. As a result, the air flowing in the radial direction due to the rotation of the fan 14 is suppressed from coming into contact with the rotor conductor 16 and the stator conductor 18 through the gap between the first guide 21 and the fan 14.
- the first guide 21 forms a labyrinth flow path with the fan 14, as shown in FIG. Specifically, the end portion 211 of the first guide 21 in the direction of the rotation axis AX and the radial end portion 311 of the blade portion 31 of the fan 14 face each other in the direction of the rotation axis AX.
- the end portion 211 of the first guide 21 is recessed in the direction of the rotation axis AX, has an annular recess centered on the rotation axis AX, and protrudes in the direction of the rotation axis AX, and is an annular protrusion centered on the rotation axis AX.
- the portions have first uneven portions 212 arranged alternately in the radial direction.
- the radial end 311 of the wing portion 31 is recessed in the direction of the rotation axis AX, has an annular recess centered on the rotation axis AX, and projects in the direction of the rotation axis AX, and is an annular shape centered on the rotation axis AX.
- the convex portions of the above have second uneven portions 312 arranged alternately in the radial direction. Since the first guide 21 and the fan 14 have the above configuration, the fan 14 can rotate together with the shaft 11, and a labyrinth flow path is formed between the first guide 21 and the fan 14.
- the concave portion of the first uneven portion 212 and the convex portion of the second uneven portion 312 face each other with a gap of less than 10 mm in the direction of the rotation axis AX, and the convex portion of the first uneven portion 212 and the second uneven portion
- the recesses of 312 face each other in the direction of the axis of rotation AX with a gap of less than 10 mm.
- the shielding plate 24 is a plate-shaped member having a circular cross-sectional shape orthogonal to the Y-axis.
- the shielding plate 24 covers the first outflow hole 20a at a position adjacent to the first outflow hole 20a at a distance in the direction of the rotation axis AX.
- the shielding plate 24 does not obstruct the flow of air flowing out from the first outflow hole 20a, and can suppress foreign matter from entering the inside of the motor 1 through the first outflow hole 20a. At the position, it is adjacent to the first outflow hole 20a.
- the temperatures of the stator core 17, the stator conductor 18, the rotor core 15, and the rotor conductor 16 rise. As these temperatures rise, the temperatures of the shaft 11 and the bearings 22 and 23 also rise.
- the electric motor 1 is energized and the rotor core 15 and the shaft 11 rotate integrally, the fan 14 rotates together with the shaft 11, and the air outside the electric motor 1 flows into the inside of the electric motor 1 through the inflow hole 19a.
- the air flow in the motor 1 is indicated by arrows AR1 and AR2.
- the rotation of the fan 14 causes air outside the motor 1 to be formed from the inflow hole 19a between the inner peripheral surface of the first bracket 19 and the first main surface 31a of the wing portion 31. It flows into the space to be.
- the air contains foreign substances such as dust and water. Centrifugal force acts on the foreign matter due to the rotation of the fan 14, and the air containing the foreign matter flows in the radial direction as shown by the arrow AR1 and is guided to the first ventilation passage 17a by the first guide 21.
- the air guided to one end of the first ventilation passage 17a flows out from the other end of the first ventilation passage 17a through the first ventilation passage 17a.
- the air from which the foreign matter has been removed passes through the first through hole 31c located radially inside the first blade portion 32 as shown by the arrow AR2, and then the rotor conductor. It flows along one end of 16 and one end of the stator conductor 18 and reaches the second ventilation passage 17b. The air that has reached the second ventilation passage 17b passes through the second ventilation passage 17b, then near the other end of the rotor conductor 16 and near the other end of the stator conductor 18, and from the first outflow hole 20a. It leaks to the outside. As shown by the arrows AR1 and AR2, the motor 1 is cooled by the air flowing inside the motor 1.
- the air flowing in the vicinity of the rotor conductor 16 and the stator conductor 18 is the air from which the foreign matter has been removed by the rotation of the fan 14, so that the foreign matter enters the rotor conductor 16 and the stator conductor 18. Contact is suppressed, and failure of the motor 1 due to foreign matter is less likely to occur.
- the first bracket 19 When the first bracket 19 has an inflow hole 19a at a position facing the first blade portion 32, the foreign matter contained in the inflow hole 19a quickly moves to the outside in the radial direction along the first blade portion 32. Therefore, it is possible to prevent air containing foreign matter from reaching the first through hole 31c.
- the shape of the fan 14 is not limited to the above-mentioned example, and air is flowed in from the inflow hole 19a, and a part of the air flowing in from the inflow hole 19a is made to flow in the radial direction to reach the first ventilation passage 17a, and the inflow hole 19a is formed. It is arbitrary as long as it has a shape that allows the other part of the air flowing in from the air to reach the second ventilation passage 17b.
- a configuration in which the fan 14 further includes a blade portion extending from the second main surface 31b of the blade portion 31 will be described in the second embodiment.
- the fan 14 included in the electric motor 2 shown in FIG. 7 is fixed to the second main surface 31b of the wing portion 31 and separated from the second main surface 31b in addition to the configuration of the fan 14 included in the electric motor 1 according to the first embodiment.
- a second blade portion 33 extending in the direction is further provided.
- the second blade portion 33 is located radially outside the first through hole 31c and is fixed to the second main surface 31b. Being fixed to the second main surface 31b is formed separately from the wing portion 31, and is fixed to the second main surface 31b of the wing portion 31 by welding, adhesion, etc., and is integrated with the wing portion 31. It shall include being formed in.
- the radial length of the first blade portion 32 is preferably longer than the radial length of the second blade portion 33.
- the second blade portion 33 preferably extends toward the second ventilation passage 17b.
- the fan 14 has a plurality of second blade portions 33 located at intervals in the circumferential direction.
- the description of the rotor conductor 16 and the stator conductor 18 is omitted in FIG.
- the air flow in the motor 2 when the motor 2 having the above configuration is energized is the same as that in the motor 1. Similar to the electric motor 1, the electric motor 2 is cooled by the air flowing inside the electric motor 2.
- the motor 2 according to the second embodiment includes the second blade portion 33 in addition to the configuration of the motor 1, the air flow through the first through hole 31c is promoted. As a result, the air flows smoothly into the second ventilation passage 17b as compared with the electric motor 1, so that the cooling efficiency of the electric motor 2 is higher than that of the electric motor 1.
- the flow rate has a positive correlation with the length of the blade
- the radial length of the first blade portion 32 is longer than the radial length of the second blade portion 33
- the radial length is caused by the rotation of the fan 14.
- the amount of air flowing through the first through hole 31c is larger than the amount of air reaching the second ventilation passage 17b.
- the fan 14 included in the electric motor 3 shown in FIG. 9 is radially outside the second blade portion 33 of the second main surface 31b of the wing portion 31 in addition to the configuration of the fan 14 included in the electric motor 2 according to the second embodiment.
- a first tubular member 34 fixed at the position of is further provided. As shown in FIG. 10, which is a cross-sectional view taken along the line CC of FIG. 9, the first tubular member 34 is preferably a cylinder. The inner peripheral surface of the first tubular member 34 preferably abuts on the second blade portion 33. In order to avoid complication of the figure, the description of the rotor conductor 16 and the stator conductor 18 is omitted in FIG.
- the air flow in the motor 3 when the motor 3 having the above configuration is energized is the same as that in the motors 1 and 2. Similar to the electric motors 1 and 2, the electric motor 3 is cooled by the air flowing inside the electric motor 3. Since the fan 14 includes the first tubular member 34, the air that has passed through the first through hole 31c flows along the inner peripheral surface of the first tubular member 34 and reaches the first ventilation passage 17a.
- the electric motor 3 according to the third embodiment includes the first tubular member 34 in addition to the configuration of the electric motor 2, the air passing through the first through hole 31c is the first tubular member 34. It flows along the inner peripheral surface and reaches the second ventilation path 17b. As a result, since the air blowing direction can be guided to the second ventilation passage 17b, the air volume of the second ventilation passage 17b increases, and the cooling efficiency of the motor 3 is higher than that of the motors 1 and 2.
- a ventilation path may be formed in the rotor core 15.
- a configuration having a rotor core 15 in which a ventilation path is formed and a fan 14 having a shape different from that of the motors 1-3 will be described in the fourth embodiment.
- the electric motor 4 shown in FIG. 11 includes a rotor core 15 having a third ventilation passage 15a.
- the third ventilation passage 15a extends in the direction of the rotation shaft AX and penetrates the rotor core 15.
- the fan 14 included in the electric motor 4 penetrates the wing portion 31 at a position radially inside the first through hole 31c of the wing portion 31 in addition to the configuration of the fan 14 included in the electric motor 2 according to the second embodiment. It further has a second through hole 31d.
- the fan 14 is further fixed at a position radially outside the second through hole 31d of the second main surface 31b and radially inside the position of the first through hole 31c, and is separated from the second main surface 31b. It has a third blade portion 35 extending in the direction. Being fixed to the second main surface 31b is formed separately from the wing portion 31, and is fixed to the second main surface 31b of the wing portion 31 by welding, adhesion, etc., and is integrated with the wing portion 31. It shall include being formed in.
- the third blade portion 35 preferably extends toward the third ventilation passage 15a.
- the fan 14 includes a plurality of third blade portions 35 located at intervals in the circumferential direction.
- the description of the rotor conductor 16 and the stator conductor 18 is omitted in FIG.
- the fan 14 further includes a second tubular member 36 fixed at a position radially outside the third blade portion 35 of the second main surface 31b of the wing portion 31.
- the second tubular member 36 is located on the outer side in the radial direction from the third blade portion 35 and on the inner side in the radial direction from the first through hole 31c.
- the second tubular member 36 preferably has a cylindrical shape. It is preferable that the inner peripheral surface of the second tubular member 36 abuts on the third blade portion 35.
- the air flow in the motor 4 is indicated by arrows AR1, AR2, and AR3.
- the air flow indicated by the arrows AR1 and AR2 is the same as that of the first and third embodiments. Since centrifugal force acts on the foreign matter contained in the air, the air from which the foreign matter has been removed passes through the second through hole 31d located inside the first blade portion 32 in the radial direction as shown by the arrow AR3. , Reach the third ventilation passage 15a formed in the rotor core 15. The air that has reached the third ventilation passage 15a flows out from the first outflow hole 20a through the third ventilation passage 15a, as shown by the arrow AR3. As shown by the arrows AR1, AR2, and AR3, the motor 4 is cooled by the air flowing inside the motor 4. Since the fan 14 includes the second tubular member 36, the air that has passed through the second through hole 31d flows along the inner peripheral surface of the second tubular member 36 and reaches the third ventilation passage 15a.
- the motor 4 is cooled by the air flowing inside the motor 4.
- the air flowing in the vicinity of the rotor conductor 16 and the stator conductor 18 is the air from which the foreign matter has been removed by the rotation of the fan 14, so that the foreign matter enters the rotor conductor 16 and the stator conductor 18. Contact is suppressed, and failure of the motor 4 due to foreign matter is less likely to occur.
- the third ventilation path formed in the rotor core 15 is formed. Air flows through 15a, and the cooling efficiency of the electric motor 4 is higher than that of the electric motors 1-3. Since the air flowing through the third ventilation passage 15a is air from which foreign matter has been removed by the rotation of the fan 14, it is suppressed that the third ventilation passage 15a formed in the rotating rotor core 15 is blocked by the foreign matter. To. Therefore, it is suppressed that the ventilation resistance increases and the cooling efficiency of the electric motor 4 decreases.
- the electric motors 1-4 may be provided with a tubular member for smoothly flowing air in the second ventilation passage 17b.
- a configuration in which, in addition to the configuration of the electric motor 1, a tubular member for smoothly flowing air is provided in the second ventilation passage 17b will be described in the fifth embodiment.
- the electric motor 5 according to the fifth embodiment shown in FIG. 14 further includes a third tubular member 25 fixed to a surface of the stator core 17 facing the first bracket 19 in addition to the configuration of the electric motor 1.
- the third tubular member 25 is fixed to the surface of the stator core 17 facing the first bracket 19 by welding, adhesion, or the like.
- the outer peripheral surface of the third tubular member 25 is located inside the stator conductor 18 in the radial direction. Then, the third tubular member 25 guides the air that has passed through the first through hole 31c to the second ventilation passage 17b.
- the third tubular member 25 is preferably a cylinder.
- the air flow in the motor 5 when the motor 5 having the above configuration is energized is the same as that in the motor 1. Similar to the electric motor 1, the electric motor 5 is cooled by the air flowing inside the electric motor 5.
- the motor 5 according to the fifth embodiment includes the third tubular member 25 in addition to the configuration of the motor 1, the air passing through the first through hole 31c smoothly enters the second ventilation passage 17b. It flows. As a result, the air flows smoothly into the second ventilation passage 17b and the ventilation resistance becomes smaller than that of the electric motor 1-4, so that the cooling efficiency of the electric motor 5 can be further improved.
- a ventilation path may be further formed in the stator core 17.
- a configuration having a stator core 17 in which a ventilation passage is formed in addition to the first ventilation passage 17a and a fan 14 having a shape different from that of the motor 1-5 will be described in the sixth embodiment.
- the electric motor 6 shown in FIG. 15 includes a stator core 17 having a first ventilation passage 17a and a fourth ventilation passage 17c which is a through hole.
- the fourth ventilation passage 17c is located inside the first ventilation passage 17a in the radial direction, extends in the direction of the rotation axis AX, and penetrates the stator core 17.
- One end of the fourth ventilation passage 17c facing the first bracket 19 is located radially inside the inner peripheral surface of the first guide 21.
- the other end of the fourth ventilation passage 17c is located radially inside the inner peripheral surface of the second bracket 20.
- the fan 14 included in the electric motor 6 is fixed adjacent to the outer edge of the second main surface 31b of the wing portion 31 in addition to the configuration of the fan 14 included in the electric motor 1 according to the first embodiment, and is fixed from the second main surface 31b.
- a fourth blade portion 37 extending in the direction of separation is provided.
- the fan 14 further has a third through hole 31e penetrating the wing portion 31 at a position adjacent to the outer edge of the wing portion 31.
- FIG. 16 which is a cross-sectional view taken along the line EE of FIG. 15, the fan 14 has a plurality of fourth blade portions 37 located at intervals in the circumferential direction.
- the description of the rotor conductor 16 and the stator conductor 18 is omitted in FIG.
- FIGS. 16 and 17 which is a cross-sectional view taken along the line FF of FIG. 15, the wing portions 31 of the fan 14 have third through holes formed at intervals in the circumferential direction. Has 31e.
- the third through hole 31e is formed at a position located on the outer side in the radial direction from the first through hole 31c of the wing portion 31 and on the inner side in the radial direction from the outer edge of the wing portion 31. Specifically, the third through hole 31e is radially inside the first blade portion 32, and is radially inside the fourth blade portion 37 from a position adjacent to the first blade portion 32. 4 Penetrates the blade portion 31 toward a position adjacent to the blade portion 37. In order to avoid complication of the figure, the description of the surface of the first bracket 19 intersecting with the rotation axis AX and the bearing 22 is omitted in FIG.
- the air flow is indicated by arrows AR1, AR2, AR4.
- the air flow indicated by the arrows AR1 and AR2 is the same as that of the first embodiment. Centrifugal force acts on the foreign matter due to the rotation of the fan 14, so that the foreign matter does not easily enter the fourth ventilation passage 17c, and the air from which the foreign matter has been removed reaches the fourth ventilation passage 17c as shown by the arrow AR4. ..
- the air that has reached the fourth ventilation passage 17c flows out from the first outflow hole 20a through the fourth ventilation passage 17c, as shown by the arrow AR4.
- the motor 6 is cooled by the air flowing inside the motor 6.
- the motor 1-6 according to the first to sixth embodiments is a frameless type motor, but the motor 1-6 may be a motor having a frame. As an example, a configuration having a frame will be described in the seventh embodiment.
- a tubular frame 26 including a shaft 11, a rotor 12, and a stator 13 and an inner peripheral surface of the frame 26 are included.
- a second guide 27, which forms a flow path between the two guides 27, is further provided.
- the second bracket 20 is spaced apart in the circumferential direction in addition to the plurality of first outflow holes 20a located at intervals in the circumferential direction. It has a plurality of second outflow holes 20b located radially outside the first outflow hole 20a.
- the view of the motor 7 in the negative direction of the Y-axis is the same as that of FIG.
- the frame 26 is sandwiched between the first bracket 19 and the second bracket 20.
- the stator core 17 is fixed to the inner peripheral surface of the frame 26.
- the second guide 27 has a cylindrical shape and comes into contact with the stator core 17 and the second bracket 20.
- the outer peripheral surface of the second guide 27 is located inside the second outflow hole 20b in the radial direction.
- the second guide 27 forms an outflow path 27a from the other end of the first ventilation path 17a to the second outflow hole 20b with the frame 26.
- the second guide 27 is preferably a cylinder.
- the air flow in the motor 7 is indicated by arrows AR2 and AR5.
- the air flow indicated by the arrow AR2 is the same as that of the first to sixth embodiments. Since centrifugal force acts on the foreign matter contained in the air, the air containing the foreign matter flows in the radial direction as shown by the arrow AR5, and is guided to the first ventilation passage 17a by the first guide 21. The air guided to one end of the first ventilation passage 17a flows through the first ventilation passage 17a from the other end of the first ventilation passage 17a to the outflow passage 27a. The air that has passed through the outflow path 27a flows out from the second outflow hole 20b.
- the motor 7 is cooled by the air flowing inside the frame type motor 7.
- the air flowing in the vicinity of the rotor conductor 16 and the stator conductor 18 is the air from which the foreign matter has been removed by the rotation of the fan 14, so that the foreign matter enters the rotor conductor 16 and the stator conductor 18. Contact is suppressed, and failure of the electric motor 7 due to foreign matter is less likely to occur.
- the present disclosure is not limited to the above-described embodiment.
- a plurality of embodiments can be arbitrarily combined.
- the fourth ventilation passage 17c may be formed in the stator core 17 of the motors 1-5 and 7.
- the shape of the fan 14 of the electric motor 7 may be the same as the shape of the fan 14 of the electric motor 2-6.
- each part of the motor 1-7 is not limited to the above example.
- the shape of the fan 14 is arbitrary as long as it allows air containing foreign matter to flow in the radial direction and air from which foreign matter has been removed to flow through the second ventilation passage 17b.
- the fan 14 may have a wing portion 31, a first blade portion 32, and a third blade portion 35.
- the second blade portion 33 and the third blade portion 35 may form one blade.
- the first through hole 31c may be formed between the circumferential direction of the blade having the second blade portion 33 and the third blade portion 35.
- the fan 14 has a blade portion 31, a first blade portion 32, a second blade portion 33, a third blade portion 35, a first tubular member 34, and a second tubular member 36. May be good.
- the fan 14 may have a wing portion 31 having a first through hole 31c and a second through hole 31d, and a first blade portion 32.
- the fan 14 may have a wing portion 31 having a first through hole 31c and a third through hole 31e, and a first blade portion 32.
- the fan 14 may have a wing portion 31 having a first through hole 31c and a second through hole 31d, a first blade portion 32, and a third blade portion 35.
- the number of the first blade portion 32, the second blade portion 33, and the third blade portion 35 is arbitrary.
- the shape of the first through hole 31c is arbitrary as long as one end of the first through hole 31c is on the first main surface 31a and the other end of the first through hole 31c is on the second main surface 31b.
- the shape of the second through hole 31d is arbitrary as long as one end of the second through hole 31d is on the first main surface 31a and the other end of the second through hole 31d is on the second main surface 31b.
- the shape of the third through hole 31e is arbitrary as long as one end of the third through hole 31e is on the first main surface 31a and the other end of the third through hole 31e is on the second main surface 31b.
- the number of the first through hole 31c, the second through hole 31d, and the third through hole 31e is arbitrary.
- the same number of first blade portions 32 and first through holes 31c are provided at equal intervals in the circumferential direction, but the fan 14
- the shape is not limited to the above example.
- the number of the first blade portions 32 and the number of the first through holes 31c may be different.
- the first blade portions 32 may be provided at irregular intervals in the circumferential direction.
- the first through holes 31c may be provided at irregular intervals in the circumferential direction.
- the first blade portion 32 and the first through hole 31c are provided on the same straight line extending radially outward from the rotation axis AX, but the first blade portion 32 and the first through hole 31c are provided. Does not have to be on the same straight line extending radially outward from the rotation axis AX.
- the same number of fourth blade portions 37 and third through holes 31e are provided at equal intervals in the circumferential direction.
- the shape of the fan 14 is not limited to the above example.
- the number of the fourth blade portions 37 and the number of the third through holes 31e may be different.
- the fourth blade portions 37 may be provided at irregular intervals in the circumferential direction.
- the third through holes 31e may be provided at irregular intervals in the circumferential direction.
- the fourth blade portion 37 and the third through hole 31e are provided on the same straight line extending radially outward from the rotation axis AX, but the fourth blade portion 37 and the third through hole 31e are provided. Does not have to be on the same straight line extending radially outward from the rotation axis AX.
- the third through hole 31e is located radially inside the fourth blade portion 37, but the position of the third through hole 31e is not limited to the above example.
- the third through hole 31e may be formed between the fourth blade portions 37 adjacent to each other in the circumferential direction.
- the direction in which the first ventilation passage 17a extends is not limited to the direction of the rotation axis AX.
- the shape of the first ventilation passage 17a is arbitrary as long as one end of the first ventilation passage 17a is on the surface facing the first bracket 19 and the other end of the first ventilation passage 17a is facing the outside. be.
- the first ventilation passage 17a may extend in a direction intersecting the rotation axis AX.
- the direction in which the third ventilation passage 15a extends is not limited to the direction of the rotation axis AX.
- the shape of the third ventilation passage 15a may be such that one end of the third ventilation passage 15a is on the surface facing the first bracket 19 and the other end of the third ventilation passage 15a is on the surface facing the second bracket 20. If so, it is optional.
- the third ventilation passage 15a may extend in a direction intersecting the rotation axis AX.
- the direction in which the fourth ventilation passage 17c extends is not limited to the direction of the rotation axis AX.
- the shape of the fourth ventilation passage 17c may be such that one end of the fourth ventilation passage 17c is on the surface facing the first bracket 19 and the other end of the fourth ventilation passage 17c is on the surface facing the second bracket 20. If so, it is optional.
- the fourth ventilation passage 17c may extend in a direction intersecting the rotation axis AX.
- the shape of the first guide 21 and the shape of the first guide 21 can guide the air containing foreign matter to the first ventilation passage 17a.
- the position where the fixing member 21a is provided and the number of the fixing members 21a are arbitrary.
- the method of fixing the first guide 21 to the first bracket 19 is arbitrary.
- 1,2,3,4,5,6,7 motor 11 shaft, 12 rotor, 13 stator, 14 fan, 15 rotor core, 15a third ventilation path, 16 rotor conductor, 17 stator core, 17a 1st air passage, 17b 2nd air passage, 17c 4th air passage, 18 stator conductor, 19 1st bracket, 19a inflow hole, 20 2nd bracket, 20a 1st outflow hole, 20b 2nd outflow hole, 21 1st guide, 21a fixing member, 22,23 bearing, 24 shielding plate, 25 3rd cylindrical member, 26 frame, 27 2nd guide, 27a outflow path, 31 wing part, 31a 1st main surface, 31b 2nd main Surface, 31c 1st through hole, 31d 2nd through hole, 31e 3rd through hole, 32 1st blade, 33 2nd blade, 34 1st tubular member, 35 3rd blade, 36 2nd tubular Member, 37 4th blade part, 211, 311 end part, 212 1st uneven part, 312 2nd uneven part,
Abstract
Description
実施の形態1に係る電動機を、鉄道車両の駆動用に用いられる電動機を例に説明する。実施の形態1に係る電動機を図1に示す。図1において、Z軸が鉛直方向であり、Y軸は、シャフト11の回転軸AXに平行であり、X軸はY軸およびZ軸に直交する。図1において、回転軸AXを一点鎖線で示す。図1に示す電動機1は、回転軸AXまわりに回転可能に支持されるシャフト11と、シャフト11の径方向の外側に位置し、シャフト11と一体に回転する回転子12と、回転子12に径方向に対向する固定子13と、シャフト11と一体に回転するファン14と、を備える。
図1に示すように、第2ブラケット20の第1流出孔20aの外部に面する一端は、第1流出孔20aの他端よりZ軸方向で下方に位置することが好ましい。
遮蔽板24は、Y軸に直交する断面の形状が円である板状部材である。遮蔽板24は、第1流出孔20aに回転軸AXの方向に間隔を空けて隣接した位置で、第1流出孔20aを覆う。具体的には、遮蔽板24は、第1流出孔20aから流出する空気の流れを妨げず、かつ、第1流出孔20aから異物が電動機1の内部に侵入することを抑制することが可能な位置で、第1流出孔20aに隣接する。
ファン14の形状は、上述の例に限られず、流入孔19aから空気を流入させ、流入孔19aから流入した空気の一部を径方向に流して第1通風路17aに到達させ、流入孔19aから流入した空気の他の一部を第2通風路17bに到達させる形状であれば、任意である。ファン14が翼部31の第2主面31bから延びる羽根部をさらに備える構成について実施の形態2で説明する。
第1羽根部32の径方向の長さは、第2羽根部33の径方向の長さより長いことが好ましい。第2羽根部33は、第2通風路17bに向かって延びることが好ましい。
ファン14の形状の他の一例として、ファン14が翼部31の第2主面31bから延びる第2羽根部33より径方向の外側に位置する筒状部材をさらに備える構成について実施の形態3で説明する。
電動機1-3の冷却効率を高めるため、回転子鉄心15に通風路を形成してもよい。通風路が形成された回転子鉄心15を有し、電動機1-3とは異なる形状のファン14を備える構成について、実施の形態4で説明する。
第3羽根部35は、第3通風路15aに向かって延びることが好ましい。
電動機1-4は、第2通風路17bに、スムーズに空気を流すための筒状部材を備えてもよい。一例として、電動機1の構成に加えて、第2通風路17bに、スムーズに空気を流すための筒状部材を備える構成について実施の形態5で説明する。
電動機1-5の冷却効率を高めるため、固定子鉄心17にさらに通風路を形成してもよい。第1通風路17aに加えてさらに通風路が形成された固定子鉄心17を有し、電動機1-5とは異なる形状のファン14を備える構成について、実施の形態6で説明する。
実施の形態1-6に係る電動機1-6は、フレームレスタイプの電動機であったが、電動機1-6は、フレームを有する電動機でもよい。一例として、フレームを有する構成について実施の形態7で説明する。
第2ガイド27は筒状の形状を有し、固定子鉄心17と第2ブラケット20とに当接する。第2ガイド27の外周面は、第2流出孔20bより径方向の内側に位置する。第2ガイド27は、フレーム26との間で、第1通風路17aの他端から第2流出孔20bに到る流出路27aを形成する。第2ガイド27は、円筒であることが好ましい。
第2羽根部33と第3羽根部35は、一枚の羽根を形成してもよい。この場合、第2羽根部33と第3羽根部35とを有する羽根の周方向の間に、第1貫通孔31cが形成されればよい。
ファン14は、第1貫通孔31cおよび第2貫通孔31dを有する翼部31と、第1羽根部32と、を有してもよい。
ファン14は、第1貫通孔31cおよび第3貫通孔31eを有する翼部31と、第1羽根部32と、を有してもよい。
ファン14は、第1貫通孔31cおよび第2貫通孔31dを有する翼部31と、第1羽根部32と、第3羽根部35と、を有してもよい。
第1羽根部32、第2羽根部33、および第3羽根部35の数は任意である。
第2貫通孔31dの形状は、第2貫通孔31dの一端が第1主面31aにあり、第2貫通孔31dの他端が第2主面31bにある形状であれば、任意である。
第3貫通孔31eの形状は、第3貫通孔31eの一端が第1主面31aにあり、第3貫通孔31eの他端が第2主面31bにある形状であれば、任意である。
第1貫通孔31c、第2貫通孔31d、および第3貫通孔31eの数は任意である。
図16の例では、第3貫通孔31eは、第4羽根部37より径方向の内側に位置しているが、第3貫通孔31eの位置は上述の例に限られない。一例として、第3貫通孔31eは、周方向に隣接する第4羽根部37の間に形成されてもよい。
第3通風路15aが延びる方向は、回転軸AXの方向に限られない。第3通風路15aの形状は、第3通風路15aの一端が第1ブラケット19に対向する面にあり、第3通風路15aの他端が第2ブラケット20に対向する面にある形状であれば、任意である。一例として、第3通風路15aは、回転軸AXに交差する方向に延びてもよい。
第4通風路17cが延びる方向は、回転軸AXの方向に限られない。第4通風路17cの形状は、第4通風路17cの一端が第1ブラケット19に対向する面にあり、第4通風路17cの他端が第2ブラケット20に対向する面にある形状であれば、任意である。一例として、第4通風路17cは、回転軸AXに交差する方向に延びてもよい。
Claims (19)
- 回転軸まわりに回転可能に支持されるシャフトと、
前記シャフトの径方向の外側に位置し、前記シャフトと一体に回転する回転子と、
貫通孔である第1通風路を有し、前記回転子に前記径方向に対向して、前記回転子との間に第2通風路を形成する固定子と、
外部の空気を内部に流入させる流入孔を有する第1ブラケットと、
主面が前記第1ブラケットに面し、前記シャフトと一体に回転し、前記第1ブラケットの前記流入孔より前記径方向の内側の位置に対向する位置に第1貫通孔を有するファンと、
前記第1ブラケットに対向する筒状の第1ガイドと、
を備える電動機。 - 前記流入孔から流入した前記空気を外部に流出させる第1流出孔を有し、前記回転子、前記固定子、および前記ファンを挟んで前記第1ブラケットに前記回転軸の方向に対向する第2ブラケットをさらに備える、
請求項1に記載の電動機。 - 前記第2ブラケットの外周面は、前記第1通風路より前記径方向の内側に位置する、
請求項2に記載の電動機。 - 前記流入孔から流入した前記空気は、前記ファンの回転によって前記径方向に流れ、前記第1ガイドによって前記第1通風路の一端に導かれ、前記第1通風路を通って、前記第1通風路の他端から前記外部に流出する、
請求項3に記載の電動機。 - 前記固定子、前記回転子、および前記シャフトを内包する筒状のフレームと、
前記第2ブラケットと前記固定子に当接し、前記フレームの内周面との間に流出路を形成する筒状の第2ガイドと、をさらに備え、
前記第1ブラケットは、前記フレームの一端を塞ぎ、
前記第2ブラケットは、前記フレームの他端を塞ぎ、
前記第2ブラケットは、前記第2ガイドが当接する位置より前記径方向の外側に、前記流入孔から流入した前記空気を前記外部に流出させる第2流出孔を有する、
請求項2に記載の電動機。 - 前記流入孔から流入した前記空気は、前記ファンの回転によって前記径方向に流れ、前記第1ガイドによって前記第1通風路の一端に導かれ、前記第1通風路および前記流出路を通って、前記第2流出孔から前記外部に流出する、
請求項5に記載の電動機。 - 前記ファンは、
前記シャフトに固定され、前記第1貫通孔を有する環状の翼部と、
前記翼部の前記第1主面の前記貫通孔より前記径方向の外側の位置に固定され、前記第1主面から離れる方向に延びる第1羽根部を有する、
請求項1から6のいずれか1項に記載の電動機。 - 前記第1ブラケットは、前記第1羽根部に対向する位置に前記流入孔を有する、
請求項7に記載の電動機。 - 前記翼部の前記第1主面の反対側の第2主面の前記第1貫通孔より前記径方向の外側の位置に固定され、前記第2主面から離れる方向に延びる第2羽根部をさらに備える、
請求項7または8に記載の電動機。 - 前記第1羽根部の前記径方向の長さは、前記第2羽根部の前記径方向の長さより長い、
請求項9に記載の電動機。 - 前記ファンは、前記翼部の前記第2主面の前記第2羽根部より前記径方向の外側の位置に固定される第1筒状部材をさらに備える、
請求項9または10に記載の電動機。 - 前記ファンは、前記第1貫通孔より前記径方向の内側の位置に第2貫通孔をさらに有する、
請求項7から11のいずれか1項に記載の電動機。 - 前記ファンは、前記第2貫通孔より前記径方向の外側の位置であって、前記第1貫通孔より前記径方向の内側の位置で前記翼部の前記第1主面の反対側の第2主面に固定され、前記第2主面から離れる方向に延びる第3羽根部をさらに有する、
請求項12に記載の電動機。 - 前記ファンは、前記翼部の前記第2主面の前記第3羽根部より前記径方向の外側の位置に固定される第2筒状部材をさらに備える、
請求項13に記載の電動機。 - 前記ファンは、前記翼部の前記第1主面の反対側の第2主面の外縁に隣接して固定され、前記第2主面から離れる方向に延びる第4羽根部をさらに有する、
請求項7から14のいずれか1項に記載の電動機。 - 前記回転子は、前記回転子を貫通した第3通風路を有する、
請求項1から15のいずれか1項に記載の電動機。 - 前記固定子は、前記第1通風路より前記径方向の内側に位置し、前記固定子を貫通した第4通風路をさらに有し、
前記第4通風路の前記第1ブラケットに面する一端は前記第1ガイドの内周面より前記径方向の内側に位置する、
請求項1から16のいずれか1項に記載の電動機。 - 前記ファンは、外縁に隣接する位置に第3貫通孔をさらに有する、
請求項1から17のいずれか1項に記載の電動機。 - 前記固定子の前記第1ブラケットに対向する面に固定され、外周面が前記第1ガイドの内周面に対向する第3筒状部材をさらに備える、
請求項1から18のいずれか1項に記載の電動機。
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US18/247,677 US20230412049A1 (en) | 2020-12-24 | 2020-12-24 | Electric motor |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60190164U (ja) * | 1984-05-24 | 1985-12-17 | 三菱電機株式会社 | 回転電機の内部フアン |
JP2006271081A (ja) * | 2005-03-23 | 2006-10-05 | Toshiba Corp | 全閉外扇形電動機 |
JP2012231656A (ja) * | 2011-04-27 | 2012-11-22 | Toshiba Corp | 鉄道車両用電動機 |
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2020
- 2020-12-24 US US18/247,677 patent/US20230412049A1/en active Pending
- 2020-12-24 WO PCT/JP2020/048385 patent/WO2022137416A1/ja active Application Filing
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60190164U (ja) * | 1984-05-24 | 1985-12-17 | 三菱電機株式会社 | 回転電機の内部フアン |
JP2006271081A (ja) * | 2005-03-23 | 2006-10-05 | Toshiba Corp | 全閉外扇形電動機 |
JP2012231656A (ja) * | 2011-04-27 | 2012-11-22 | Toshiba Corp | 鉄道車両用電動機 |
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