JP2017109823A - Hoisting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hoisting machine improving cooling performance of an inner part of a motor.SOLUTION: A hoisting machine includes: a sheave around which a rope can be wound; a motor rotationally driving the sheave; and a base supporting the sheave and the motor. The motor includes: a rotor core connected to the sheave and rotating around a central axis; a cylindrical stator core disposed on the radially outside of the rotor core; and a frame forming a ventilation space with the outer peripheral surface of the rotor core and provided with a suction port and an exhaust port making the inside and the outside of the ventilation space communicate with each other. The exhaust port is provided with a blower exhausting air from the inside of the frame to the outside of the frame.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to a hoisting machine.

  As a cooling system for the motor of the hoisting machine, a forced air cooling system in which air is passed through the motor and cooled by a blower or a fan using rotation during operation is employed. However, in recent years, the capacity of the electric motor of the hoisting machine has been increased, and the cooling capacity inside the electric motor may be insufficient.

JP 2001-322780 A

  The problem to be solved by the present invention is to provide a hoisting machine capable of improving the cooling performance inside the electric motor.

  The hoisting machine of the embodiment includes a sheave provided so that a rope can be wound thereon, an electric motor that rotationally drives the sheave, and a base that supports the sheave and the electric motor. An electric motor is connected to a sheave and rotates between a rotor core that rotates about a central axis, a cylindrical stator core that is disposed radially outside the rotor core, and an outer peripheral surface of the rotor core. And a frame provided with an intake port and an exhaust port communicating with the inside and outside of the ventilation space. A blower for exhausting air from the inside of the frame to the outside of the frame is disposed at the exhaust port.

The front fragmentary sectional view of the winding machine which concerns on 1st Embodiment. Sectional drawing in the II-II line of FIG. Sectional drawing in the III-III line of FIG. The fragmentary sectional view of the electric motor which concerns on 2nd Embodiment. The fragmentary sectional view of the electric motor which concerns on the modification of 2nd Embodiment. The fragmentary sectional view of the electric motor which concerns on 3rd Embodiment. The fragmentary sectional view of the electric motor which concerns on 4th Embodiment. Sectional drawing in the VIII-VIII line of FIG. The fragmentary sectional view of the electric motor which concerns on 5th Embodiment. It is explanatory drawing of the electric motor which concerns on 5th Embodiment, Comprising: The perspective view which looked at the part located inside the inner peripheral surface of the cylinder part of a flame | frame from the lower side. It is explanatory drawing of the electric motor which concerns on 5th Embodiment, Comprising: The perspective view which looked at the part located inside the inner peripheral surface of the cylinder part of a flame | frame from the upper side. The fragmentary sectional view of the electric motor which concerns on 6th Embodiment. The fragmentary sectional view of the electric motor which concerns on the modification of 6th Embodiment.

  Hereinafter, a hoisting machine according to an embodiment will be described with reference to the drawings.

(First embodiment)
First, the hoist 1 of the first embodiment will be described.
FIG. 1 is a partial front sectional view of the hoist according to the first embodiment.
As shown in FIG. 1, a hoisting machine 1 includes a sheave 2 provided so as to be able to wind a rope for suspending an elevator car or the like, an electric motor 3 that rotationally drives the sheave 2, and a pair that supports the sheave 2 and the electric motor 3. And the base 6 that supports the electric motor 3 and the bearings 4 and 5. Bearings 4a and 5a are disposed on the bearing portions 4 and 5, respectively.

2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG.
As shown in FIG. 3, the electric motor 3 mainly includes a rotor 10, a stator 20, a frame 30, an intake port 41, an exhaust port 42, a blower 45, and a cover 50.
As shown in FIG. 1, the rotor 10 rotates around the central axis O. The rotor 10 includes a shaft 11 connected to the sheave 2 and a rotor iron core 13 fixed to the shaft 11. In the following description, a direction along the central axis O is referred to as an axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.

The shaft 11 is disposed coaxially with the central axis O. The shaft 11 is rotatably supported by bearings 4a and 5a of the bearing portions 4 and 5.
The rotor core 13 is formed in a cylindrical shape by laminating a plurality of annular magnetic steel plates along the axial direction. A shaft 11 is press-fitted inside the rotor core 13.

  A fan 15 is provided between the rotor core 13 and the cover 50. The fan 15 is composed of a plurality of plate-like blades provided on both axial end surfaces of the rotor core 13. The blades are provided in a state of standing along the axial direction, and are arranged so that the front and back surfaces face the circumferential direction. In addition, a blade | wing may be directly attached with respect to the rotor iron core 13, and may be attached via the member which consists of nonmagnetic materials, such as aluminum. The fan 15 rotates as the rotor core 13 rotates.

The stator 20 mainly includes a stator core 21 and a stator coil 23.
The stator core 21 is formed in a cylindrical shape extending along the axial direction by laminating a plurality of annular magnetic steel plates along the axial direction. The stator core 21 is arranged on the outer side in the radial direction than the rotor core 13 of the rotor 10. A plurality of stator slots (not shown) extending along the axial direction are formed in the stator core 21 at equal intervals in the circumferential direction. A stator coil 23 is disposed in the stator slot.

  As shown in FIG. 2, the frame 30 is formed of a metal material such as a steel material in an annular shape when viewed from the axial direction. As shown in FIG. 3, the frame 30 surrounds the outer peripheral surface of the stator core 21 from the radially outer side over the entire circumference. The frame 30 forms a ventilation space R with the outer peripheral surface of the stator core 21. The frame 30 includes a cylindrical cylindrical portion 31 extending along the axial direction, a pair of annular outer flange portions 33 projecting radially outward from both axial end portions of the cylindrical portion 31, and a shaft of the cylindrical portion 31. A pair of annular walls 35 that project radially inward from both ends in the direction and hold the stator core 21. The outer flange portion 33 is fixed to the cylindrical portion 31 by welding or the like. The outer flange portion 33 may be formed integrally with the cylindrical portion 31.

The pair of annular walls 35 are provided apart in the axial direction. The pair of annular walls 35 are fixed to both ends of the cylindrical portion 31 in the axial direction by welding or the like. The pair of annular walls 35 are in contact with both axial ends of the outer peripheral surface of the stator core 21 at the inner peripheral edge thereof. Note that the annular wall 35 may be formed integrally with the cylindrical portion 31.
The ventilation space R is formed by being surrounded by the cylindrical portion 31, the pair of annular walls 35, and the stator core 21, and allows air to flow therethrough. The ventilation space R is continuous in the circumferential direction.

As shown in FIG. 2, the cylindrical portion 31 has a pair of intake ports 41 (first intake port 41 </ b> A and second intake port 41 </ b> B) and a pair of exhaust ports that penetrate in the radial direction and communicate with the inside and outside of the ventilation space R. 42 (first exhaust port 42A and second exhaust port 42B) are formed. Each intake port 41 is formed at a position shifted by 45 ° from the lower end in the vertical direction of the cylindrical portion 31 to both sides in the circumferential direction.
Each exhaust port 42 is formed at a position shifted by 45 ° from the upper end in the vertical direction of the cylindrical portion 31 to both sides in the circumferential direction. The first exhaust port 42A is provided on the opposite side of the first intake port 41A across the central axis O. The second exhaust port 42B is provided on the opposite side of the second intake port 41B with the central axis O in between.

  A blower 45 is provided outside each exhaust port 42. In the present embodiment, the blower 45 is a multiblade fan (sirocco fan). The blower 45 exhausts air from the inside of the ventilation space R (inside the frame 30) to the outside of the ventilation space R (outside of the frame 30) through each exhaust port 42.

  In the ventilation space R, a plurality of support ribs 39 (10 in this embodiment) for supporting the stator 20 are arranged. As shown in FIG. 1, the support rib 39 is fixed to the inner peripheral surface of the cylindrical portion 31, extends along the axial direction, and contacts the outer peripheral surface of the stator core 21. The support rib 39 is formed in a rectangular shape corresponding to the shape of the ventilation space R when viewed from the circumferential direction. A notch 39 a that is recessed from the radially inner side to the outer side as viewed from the circumferential direction is formed at the radially inner end of the support rib 39. The support rib 39 is fixed to the cylinder portion 31 by welding or the like, and holds the stator core 21 by shrink fitting.

  The cover 50 is connected to the frame 30 and surrounds the stator core 21, the rotor core 13 and the frame 30 from the outside in the axial direction. The cover 50 is disposed on the side opposite to the bearing portions 4 and 5 in the axial direction with the rotor core 13 interposed between the first cover 51 disposed on the bearing portions 4 and 5 side in the axial direction from the rotor core 13. Second cover 52 formed. The first cover 51 is formed in a bottomed cylindrical shape and is arranged coaxially with the central axis O. The opening edge of the first cover 51 is connected to the cylindrical portion 31 of the frame 30. A shaft insertion hole 51 a that penetrates in the axial direction and is coaxial with the central axis O is formed in the bottom wall portion of the first cover 51. The inner diameter of the shaft insertion hole 51 a is equal to the outer diameter of the shaft 11. The shaft 11 is inserted through the shaft insertion hole 51a. The second cover 52 is formed in a bottomed cylindrical shape and is disposed coaxially with the central axis O. An opening edge of the second cover 52 is connected to the cylindrical portion 31 of the frame 30.

Hereinafter, an operation of the hoist 1 according to the first embodiment will be described.
When the blower 45 is driven, the air in the ventilation space R is exhausted through the exhaust port 42. Thereby, the inside of ventilation space R becomes a negative pressure. When the pressure in the ventilation space R becomes negative, air is introduced from the outside of the ventilation space R into the ventilation space R through the intake port 41. In this way, as shown by arrows A1 and A2 in FIG. 2, the air introduced through the intake port 41 is allowed to flow along the outer peripheral surface of the stator core 21 without flowing out of the ventilation space R, and the exhaust port 42 can be discharged.

  According to the hoisting machine 1 according to the first embodiment described above, the electric motor 3 includes the frame 30 that forms the ventilation space R with the outer peripheral surface of the stator core 21. Since the intake port 41 and the exhaust port 42 that communicate between the inside and the outside of the space R are formed, the air can be introduced into the ventilation space R through the intake port 41 by making the inside of the ventilation space R negative by the blower 45. . Thereby, the air introduced from the outside of the ventilation space R into the ventilation space R through the intake port 41 can be made to flow along the outer peripheral surface of the stator core 21 toward the exhaust port 42. Can be cooled. Therefore, the cooling performance inside the electric motor 3 can be improved.

Further, the frame 30 includes the support rib 39 that is fixed to the inner peripheral surface of the cylindrical portion 31 facing the outer peripheral surface of the stator core 21 and abuts on the outer peripheral surface of the stator core 21. The iron core 21 can be held more firmly.
And since the notch part 39a is formed in the support rib 39, it can suppress that the flow of the air in the ventilation space R is inhibited.

  In addition, since the intake port 41 is opened downward, it is possible to prevent foreign matter from entering the ventilation space R through the intake port 41.

  In the first embodiment, each intake port 41 is formed at a position shifted by 45 ° from the lower end in the vertical direction of the cylindrical portion 31 to both sides in the circumferential direction. However, the present invention is not limited to this. Each intake port 41 can be formed at an arbitrary position. The same applies to the formation position of each exhaust port 42.

  Moreover, in the said 1st Embodiment, although the notch part 39a of the support rib 39 is formed in the edge part inside the radial direction of the support rib 39, it is not limited to this. The cutout portion of the support rib only needs to be able to prevent the air flow in the ventilation space R from being inhibited. For example, the cutout portion of the support rib may be formed at the radially outer end of the support rib.

(Second Embodiment)
Next, the electric motor 103 provided in the hoist according to the second embodiment will be described.
FIG. 4 is an explanatory diagram of the electric motor according to the second embodiment, and is a partial cross-sectional view taken along a line II-II in FIG.
In the first embodiment shown in FIG. 2, the electric motor 3 includes a support rib 39. On the other hand, in the second embodiment shown in FIG. 4, the electric motor 103 is different from the first embodiment in that it does not include a support rib (the same applies to the following embodiments). In the first embodiment shown in FIG. 2, the cylinder portion 31 of the electric motor 3 is formed with a pair of intake ports 41 and a pair of exhaust ports 42. On the other hand, in the second embodiment shown in FIG. 4, the cylinder portion 131 of the electric motor 103 is formed with one intake port 41 and one exhaust port 42, respectively, in the first embodiment. Is different. In addition, about the structure similar to 1st Embodiment shown in FIGS. 1-3, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the cylinder portion 131 is formed with one intake port 41 and one exhaust port 42 that penetrate in the radial direction and communicate with the inside and outside of the ventilation space R. The air inlet 41 is formed at a position shifted by 45 ° from the lower end in the vertical direction of the cylindrical portion 131 toward one side in the circumferential direction. The exhaust port 42 is provided on the opposite side across the central axis O. The exhaust port 42 is formed at a position shifted by 45 ° from the upper end portion in the vertical direction of the cylindrical portion 131 toward one side in the circumferential direction.

  In the electric motor 103 according to the second embodiment described above, the exhaust port 42 is provided on the opposite side of the intake port 41 with the central axis O interposed therebetween. For this reason, as shown by arrows A1 and A2 in FIG. 4, the air introduced into the ventilation space R through the air inlet 41 is diverted to both sides in the circumferential direction, and the entire circumference of the outer peripheral surface of the stator core 21 is distributed. Can flow along. Thereby, the stator core 21 can be cooled uniformly.

FIG. 5 is an explanatory view of an electric motor according to a modified example of the second embodiment, and is a partial cross-sectional view of a portion corresponding to the line II-II in FIG. 1.
As shown in FIG. 5, the ventilation space R may be provided with a first partition plate 47A and a second partition plate 47B that divide the ventilation space R in the circumferential direction. Specifically, the first partition plate 47A is arranged so that the front and back surfaces face the circumferential direction. The first partition plate 47A extends from the ventilation space R into the intake port 41. The second partition plate 47B is arranged so that the front and back surfaces face the circumferential direction. The second partition plate 47 </ b> B extends from the ventilation space R into the exhaust port 42. The ventilation space R is in a state including a first space R1 and a second space R2 sandwiched between the first partition plate 47A and the second partition plate 47B.

  Thus, the ventilation space R is provided with the first partition plate 47A and the second partition plate 47B that divide the ventilation space R in the circumferential direction, and the second partition plate 47B extends from the inside of the ventilation space R to the exhaust port 42. It extends in. For this reason, when the blower 45 is driven, the divided ventilation spaces R (first space R1 and second space R2) can be similarly brought into a negative pressure state. Further, since the first partition plate 47A extends from the inside of the ventilation space R into the intake port 41, air can be similarly introduced into the divided ventilation space R through the intake port 41, respectively. Thereby, as shown by arrows A1 and A2 in FIG. 5, the air introduced into the ventilation space R through the intake port 41 is more reliably diverted to both sides in the circumferential direction, so that the outer peripheral surface of the stator core 21 It can be made to flow along the entire circumference. Therefore, the stator core 21 can be cooled more evenly.

(Third embodiment)
Next, the electric motor 203 provided in the hoist according to the third embodiment will be described.
FIG. 6 is an explanatory diagram of the electric motor according to the third embodiment, and is a partial cross-sectional view taken along the line II-II in FIG.
In the third embodiment shown in FIG. 6, the first partition plate 48 </ b> A and the second partition plate 48 </ b> B that divide the ventilation space R in the circumferential direction between the intake ports 41 and between the exhaust ports 42. Are different from the first embodiment in that they are respectively disposed. In addition, about the structure similar to 1st Embodiment shown in FIGS. 1-3, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 6, the first partition plate 48 </ b> A and the second partition plate 48 </ b> B are disposed in the ventilation space R. 48 A of 1st partition plates are arrange | positioned in the position which shifted | deviated 45 degrees from the vertical direction lower end part of the cylinder part 231 to the circumferential direction one side. The second partition plate 48B is disposed at a position shifted by 45 ° from the upper end in the vertical direction of the cylindrical portion 231 to one side in the circumferential direction. Each of the partition plates 48A and 48B is arranged so that the front and back surfaces thereof face the circumferential direction, and the ventilation space R is divided in the circumferential direction to form a first space R1 and a second space R2.

  A first air inlet 41A is formed at one end in the circumferential direction of the first space R1. A first exhaust port 42A is formed at the other end in the circumferential direction of the first space R1. A second exhaust port 42B is formed at one end in the circumferential direction of the second space R2. A second air inlet 41B is formed at the other end in the circumferential direction of the second space R2. The first exhaust port 42A is provided on the opposite side of the second intake port 41B with the central axis O in between. The second exhaust port 42B is provided on the opposite side of the first intake port 41A across the central axis O.

  In the electric motor 203 according to the third embodiment described above, the first air inlet 41A and the first air inlet 41A are provided at the end in the circumferential direction of the first space R1 sandwiched between the first partition plate 48A and the second partition plate 48B. An exhaust port 42A is formed. Moreover, the 2nd inlet 41B and the 2nd exhaust 42B are formed in the edge part in the circumferential direction of 2nd space R2. Thus, as shown by arrows A1 and A2 in FIG. 6, air is introduced into the first space R1 and the second space R2 through the air inlets 41A and 41B, respectively, so that the entire outer peripheral surface of the stator core 21 can be obtained. It can be made to flow along the circumference. Therefore, the stator core 21 can be cooled more evenly.

(Fourth embodiment)
Next, the electric motor 303 provided in the hoist according to the fourth embodiment will be described.
FIG. 7 is an explanatory diagram of the electric motor according to the fourth embodiment, and is a partial cross-sectional view of a portion corresponding to the line II-II in FIG. 1. 8 is a cross-sectional view taken along line VIII-VIII in FIG.
The fourth embodiment shown in FIGS. 7 and 8 differs from the first embodiment in that a through-hole 336 that penetrates in the axial direction is formed in the annular wall 335 of the frame 30. Further, the fourth embodiment shown in FIG. 8 is different from the first embodiment in that ventilation holes 351a and 352a communicating with the inside and the outside of the cover 350 are formed. In addition, about the structure similar to 1st Embodiment shown in FIGS. 1-3, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 7 and 8, a pair of through holes 336 are formed in the pair of ring walls 335, respectively. The through holes 336 are formed at the upper end portion and the lower end portion of each annular wall 335. The through hole 336 is a long hole along the circumferential direction. The through hole 336 communicates the ventilation space R with the inside of the cover 350.

As shown in FIG. 8, the cover 350 has a first cover 351 disposed on the bearing portions 4 and 5 side (see FIG. 1) in the axial direction with respect to the rotor core 13, and the rotor core 13 in the axial direction. And a second cover 352 disposed on the opposite side to the bearing portions 4 and 5.
The first cover 351 is formed in a bottomed cylindrical shape. A vent hole 351 a that penetrates in the axial direction and is coaxial with the central axis O is formed in the bottom wall portion of the first cover 351. The inner diameter of the vent hole 351 a is larger than the outer diameter of the shaft 11. The shaft 11 is inserted through the ventilation port 351a. The second cover 352 is formed in a bottomed cylindrical shape. A vent hole 352 a that penetrates in the axial direction and is coaxial with the central axis O is formed in the bottom wall portion of the second cover 352. The inner diameter of the vent hole 352a is equal to the inner diameter of the vent hole 351a of the first cover 351, for example.

  In the electric motor 303 according to the fourth embodiment described above, a through hole 336 is formed in the annular wall 335 to communicate the inside and outside of the ventilation space R. For this reason, the ventilation space R and the inside of the cover 350 can be set to a negative pressure through the through hole 336 by the blower 45. Since the vent holes 351a and 352a are formed in the cover 350, air can be introduced around the stator core 21 and the rotor core 13 through the vent holes 351a and 352a. Therefore, as indicated by arrows B1 to B4 in FIG. 8, the air inside the cover 350 can be made to flow, and not only the stator core 21 but also the rotor core 13 can be cooled.

(Fifth embodiment)
Next, an electric motor 403 included in the hoist according to the fifth embodiment will be described.
FIG. 9 is an explanatory diagram of the electric motor according to the fifth embodiment, and is a partial cross-sectional view taken along the line II-II in FIG. FIG. 10 is an explanatory diagram of the electric motor according to the fifth embodiment, and is a perspective view of a portion located on the inner side of the inner peripheral surface of the cylindrical portion of the frame as viewed from below. FIG. 11 is an explanatory view of the electric motor according to the fifth embodiment, and is a perspective view of a portion located on the inner side of the inner peripheral surface of the cylindrical portion of the frame as viewed from above.

  In the fifth embodiment shown in FIG. 9 to FIG. 11, the third embodiment shown in FIG. 6 is such that the first space R1 and the second space R2 overlap in a part of the region when viewed from the axial direction. Is different. In addition, about the structure similar to 3rd Embodiment shown in FIG. 6, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 9 to 11, the first partition plate 49 </ b> A and the second partition plate 49 </ b> B are disposed in the ventilation space R. The first partition plate 49A and the second partition plate 49B divide the ventilation space R in the circumferential direction to form a first space R1 and a second space R2.

  As shown in FIG. 10, the first partition plate 49A extends so as to connect the pair of annular walls 35 (the annular walls 35A and 35B). The first divider plate 49A includes a first bypass portion 49Aa that bypasses the first intake port 41A, a second bypass portion 49Ab that bypasses the second intake port 41B, a first bypass portion 49Aa, and a second bypass portion 49Ab. A connecting portion 49Ac to be connected. The first bypass portion 49Aa extends from one annular wall 35A so as to bypass the first intake port 41A on the side opposite to the second intake port 41B across the first intake port 41A. The second bypass portion 49Ab extends from the other annular wall 35B so as to bypass the second intake port 41B on the side opposite to the first intake port 41A across the second intake port 41B. Connection part 49Ac is extended along the circumferential direction between each inlet 41A, 41B. As shown in FIG. 9, the first partition plate 49 </ b> A is fixed to the inner peripheral surface of the cylindrical portion 31 by welding or the like, and is in contact with the outer peripheral surface of the stator core 21.

  As shown in FIG. 11, the second partition plate 49B extends so as to connect the pair of annular walls 35 to each other. The second partition plate 49B includes a first bypass portion 49Ba that bypasses the first exhaust port 42A, a second bypass portion 49Bb that bypasses the second exhaust port 42B, a first bypass portion 49Ba, and a second bypass portion 49Bb. Connecting portion 49Bc to be connected. The first bypass portion 49Ba extends from the other annular wall 35B so as to bypass the first exhaust port 42A on the side opposite to the second exhaust port 42B across the first exhaust port 42A. The second bypass portion 49Bb extends from one annular wall 35A so as to bypass the second exhaust port 42B on the side opposite to the first exhaust port 42A across the second exhaust port 42B. The connecting portion 49Bc extends along the circumferential direction between the exhaust ports 42A and 42B. As shown in FIG. 9, the second partition plate 49 </ b> B is fixed to the inner peripheral surface of the cylindrical portion 31 by welding or the like, and is in contact with the outer peripheral surface of the stator core 21.

  As shown in FIG. 9, a first air inlet 41A is formed at one end R1a in the circumferential direction of the first space R1. A first exhaust port 42A is formed at the other end R2b in the circumferential direction of the first space R1. A second exhaust port 42B is formed at one end R2a in the circumferential direction of the second space R2. A second air inlet 41B is formed at the other end R2b in the circumferential direction of the second space R2. Both end portions R1a and R1b of the first space R1 overlap with the second space R2 when viewed from the axial direction.

  According to the electric motor 403 according to the fifth embodiment described above, both end portions R1a and R1b of the first space R1 overlap with the second space R2 when viewed from the axial direction. Thereby, the air introduced through the intake ports 41 </ b> A and 41 </ b> B can be made to flow along the entire circumference of the outer peripheral surface of the stator core 21. Therefore, the stator core 21 can be cooled more evenly.

(Sixth embodiment)
Next, the electric motor 503 provided in the hoist according to the sixth embodiment will be described.
FIG. 12 is an explanatory diagram of the electric motor according to the sixth embodiment, and is a partial cross-sectional view taken along the line III-III in FIG.
In the sixth embodiment shown in FIG. 12, the cover 550 is provided with first ventilation ports 551a and 552a and second ventilation ports 551b and 552b that communicate the inside and the outside of the electric motor 503. It is different from the embodiment. In addition, about the structure similar to 1st Embodiment shown in FIGS. 1-3, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

As shown in FIG. 12, the cover 550 has a first cover 551 disposed on the bearing portions 4 and 5 side (see FIG. 1) in the axial direction with respect to the rotor core 13, and an axial direction sandwiching the rotor core 13. And a second cover 552 arranged on the opposite side of the bearing portions 4 and 5.
The first cover 551 is formed in a bottomed cylindrical shape. The first cover 551 is formed with a first ventilation port 551a and a second ventilation port 551b provided on the outer side in the radial direction than the first ventilation port 551a. The first ventilation port 551 a is formed in the bottom wall portion of the first cover 551. The first ventilation port 551a penetrates in the axial direction and is coaxial with the central axis O. The first ventilation port 551 a is formed on the inner side in the radial direction than the fan 15. The inner diameter of the first ventilation port 551 a is larger than the outer diameter of the shaft 11. The shaft 11 is inserted through the first ventilation port 551a. The second ventilation port 551b is formed in the peripheral wall portion of the first cover 551. The second ventilation port 551b penetrates in the radial direction. A plurality of second ventilation openings 551b are formed side by side along the circumferential direction.

  The second cover 552 is formed in a bottomed cylindrical shape. The second cover 552 is formed with a first ventilation port 552a and a second ventilation port 552b provided on the outer side in the radial direction than the first ventilation port 552a. The first ventilation port 552 a is formed in the bottom wall portion of the second cover 552. The first ventilation port 552a penetrates in the axial direction and is coaxial with the central axis O. The first ventilation port 552 a is formed on the inner side in the radial direction than the fan 15. The inner diameter of the first ventilation port 552a is equal to the inner diameter of the first ventilation port 551a of the first cover 551, for example. The second ventilation port 552 b is formed in the peripheral wall portion of the second cover 552. The second ventilation port 552b penetrates in the radial direction. A plurality of second ventilation ports 552b are formed side by side along the circumferential direction.

  Here, when the fan 15 rotates with the rotation of the rotor 10, an air flow from the radially inner side to the outer side is generated inside the cover 550. In the present embodiment, the covers 551 and 552 have first ventilation holes 551a and 552a and second ventilation holes 551b and 552b provided on the outer side in the radial direction from the first ventilation holes 551a and 552a, respectively. Is formed. Therefore, due to the air flow inside the cover 550 described above, the air outside the cover 550 is introduced into the cover 550 through the first ventilation ports 551a and 552a as indicated by arrows B1 to B4 in FIG. . Furthermore, after flowing from the inner side of the cover 550 toward the outer side in the radial direction, the air is discharged from the second ventilation ports 551b and 552b to the outer side of the cover 550. As described above, air can flow through the space between the cover 550 and the rotor core 13 and the stator core 21, so that not only the stator core 21 but also the rotor core 13 can be cooled. it can.

FIG. 13 is an explanatory diagram of an electric motor according to a modification of the sixth embodiment, and is a partial cross-sectional view of a portion corresponding to the line III-III in FIG. 2.
In addition, as shown in FIG. 13, each ventilation port 551a, 551b, 552a, 552b formed in each cover 551,552 may be formed in the bottom wall part of each cover 551,552, respectively. Specifically, a plurality of first ventilation openings 551a of the first cover 551 are formed side by side along the circumferential direction around the center of the bottom wall portion. A plurality of second ventilation openings 551b of the first cover 551 are formed side by side along the circumferential direction on the radially outer side of the first ventilation openings 551a. The second ventilation port 551b is provided at the same position in the circumferential direction as the first ventilation port 551a, for example. A plurality of first ventilation openings 552a of the second cover 552 are formed side by side along the circumferential direction around the center of the bottom wall portion. A plurality of second ventilation ports 552b of the second cover 552 are formed side by side along the circumferential direction on the radially outer side of the first ventilation port 552a. For example, the second ventilation port 552b is provided at the same position in the circumferential direction as the first ventilation port 552a.

  Even in this configuration, as indicated by arrows B1 to B4 in FIG. 13, the air outside the cover 550 is introduced into the cover 550 through the first ventilation ports 551a and 552a, and the inside of the cover 550 is radially directed. After flowing from the inside to the outside, the air can be discharged to the outside of the cover 550 from the second ventilation ports 551b and 552b. Therefore, since air can be passed through the space between the cover 550 and the rotor core 13 and the stator core 21, not only the stator core 21 but also the rotor core 13 can be cooled. .

  In the second to sixth embodiments, the electric motor does not include the support ribs 39 in the first embodiment, but includes the support ribs 39 as in the electric motor 3 of the first embodiment. Also good.

  According to at least one embodiment described above, the electric motor includes a frame that forms a ventilation space with the outer peripheral surface of the stator core, and the frame includes an intake port and an exhaust port that communicate with the inside and outside of the ventilation space. Therefore, air can be introduced into the ventilation space through the intake port by making the pressure in the ventilation space negative by the blower. Thereby, the air introduced from the outside of the ventilation space into the ventilation space through the intake port can be made to flow along the outer peripheral surface of the stator core toward the exhaust port, and the stator core can be cooled. Therefore, the cooling performance inside the electric motor can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Hoisting machine, 2 ... Sheave, 3, 103, 203, 303, 403, 503 ... Electric motor, 6 ... Base, 13 ... Rotor core, 15 ... Stator core, 21 ... Stator core, 30 ... Frame, 39 ... support ribs, 41 ... intake port, 41A ... first intake port, 41B ... second intake port, 42 ... exhaust port, 42A ... first exhaust port, 42B ... second exhaust port, 45 ... blower, 47A ... first 1 partition plate, 47B ... 2nd partition plate, 48A, 49A ... 1st partition plate, 48B, 49B ... 2nd partition plate, 336 ... through-hole, 350, 550 ... cover, 351a, 352a ... vent hole, 551a, 552a ... 1st vent, 551b, 552b ... 2nd vent, R ... Ventilation space, R1 ... 1st space, R2 ... 2nd space

Claims (8)

A sheave that can be wrapped around a rope,
An electric motor for rotating the sheave;
A base supporting the sheave and the electric motor;
With
The motor is
A rotor core connected to the sheave and rotating about a central axis;
A cylindrical stator core disposed radially outside the rotor core;
A frame provided with an air inlet and an air outlet that forms a ventilation space with the outer peripheral surface of the rotor core and communicates the inside and outside of the ventilation space;
With
A hoisting machine in which a blower for exhausting air from the inside of the frame to the outside of the frame is disposed at the exhaust port.   The hoist according to claim 1, further comprising a support rib fixed to an inner peripheral surface of the frame facing the outer peripheral surface and abutting against the outer peripheral surface of the stator core. The ventilation space is provided continuously in the circumferential direction of the rotor core,
The hoist according to claim 1 or 2, wherein the exhaust port is provided on a side opposite to the intake port across the central axis. The ventilation space is provided with a first partition plate and a second partition plate that divide the ventilation space in the circumferential direction of the stator core,
The first partition plate extends from the ventilation space into the intake port,
The hoisting machine according to any one of claims 1 to 3, wherein the second partition plate extends from the ventilation space into the exhaust port. The intake port includes a first intake port and a second intake port,
The exhaust port includes a first exhaust port and a second exhaust port,
The ventilation space is provided with a first partition plate and a second partition plate that divide the ventilation space in the circumferential direction of the stator core and form a first space and a second space,
The first air inlet is formed at one end in the circumferential direction of the first space,
The first exhaust port is formed at the other end in the circumferential direction of the first space,
The second exhaust port is formed at one end in the circumferential direction of the second space,
The hoist according to any one of claims 1 to 3, wherein the second intake port is formed at the other end portion of the second space in the circumferential direction.   6. The hoist according to claim 5, wherein both end portions of the first space overlap the second space when viewed from the axial direction of the central axis. A cover that surrounds the stator core, the rotor core, and the frame from both sides in the axial direction of the central axis;
The cover is formed with a vent opening communicating between the inside and outside of the cover,
The hoist according to any one of claims 1 to 6, wherein a through-hole that communicates the ventilation space and the inside of the cover is formed in the frame. A cover connected to the frame and surrounding the rotor core and the stator core from outside in the axial direction of the central axis;
Between the rotor core and the cover, a fan that rotates with the rotation of the rotor core is disposed,
The cover includes
A first ventilation hole penetrating the cover;
A second ventilation port provided outside the first ventilation port in the radial direction and penetrating the cover;
The hoist according to any one of claims 1 to 6, wherein: is formed.

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