JP2019071724A - Rotary electric machine and elevator hoist system - Google Patents

Abstract

To provide a rotary electric machine with cooling efficiency improved by enhancement in efficiency of axial flow of a refrigerant therethrough, and an elevator hoist system including the rotary electric machine.SOLUTION: The rotary electric machine includes a rotor 2 including a rotary shaft 8, a stator 3 including a coil end 14, a fan 7 including a rotary shaft 13 and a blade 26, and end brackets 5 disposed at both ends in the axial direction. The rotary shaft 13 of the fan 7 is substantially parallel with the axial direction. The end brackets 5 include openings 27, 17. The fan 7 is provided in the opening 27 of one of the end brackets 5. L1>L2>L3 is satisfied where: L1 is a distance obtained by adding the radial length r of the blade 26 of the fan 7 to a radial distance from the rotary shaft 8 of the rotor 2 to the rotary shaft 13 of the fan 7; L2 is a radial distance from the rotary shaft 8 of the rotor 2 to the radial outer end of the coil end 14; and L3 is a distance obtained by subtracting the radial length r of the blade 26 of the fan 7 from the radial distance from the rotary shaft 8 of the rotor 2 to the rotary shaft 13 of the fan 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine provided with a rotor and a stator, and an elevator hoist system provided with the rotating electrical machine.

  In the past, induction motors have been used for rotating electrical machines for elevators, but in recent years permanent magnets have been used that can be reduced in size, weight, and efficiency by reducing the price of permanent magnets and popularizing high-performance inverters. A rotating electrical machine has been adopted. Since the rotary electric machine for elevators is installed in a limited space such as the top floor of a construction, the miniaturization is particularly required. In addition, reliability is also important because rotating electric machines with an output of several hundred kW class are difficult to easily replace due to problems such as breakdowns because the diameter of the rotating electric machine itself increases and the mass reaches several tons. It is. When the size of the rotating electrical machine is reduced, the power density increases, but at the same time the heat generation density also increases. Since the rotary electric machine has a lower reliability due to the increase in heat generation density, it is necessary to increase the efficiency of the cooling system. Under such circumstances, various structures, such as a cooling device described in Patent Document 1, have been studied with respect to cooling of a rotating electrical machine having a large diameter.

  In the cooling device described in Patent Document 1, for the rotating electric machine (motor) having a closed structure, a refrigerant (internal stirring agent) is circulated by a fan (agitator) installed in the inside sealed by a casing to flow the refrigerant to the heat receiving fin. The heat of the refrigerant is conducted from the heat receiving fin to the heat dissipating fin. A fan (blower) installed outside the casing blows air to the heat dissipating fins to exchange heat of the internal refrigerant, thereby cooling the heat generating portion such as a coil.

JP, 2011-24387, A

  The cooling device described in Patent Document 1 cools a fully closed rotary electric machine, and a fan installed inside the casing stirs the refrigerant inside. With such a cooling device, a sufficient cooling effect can be obtained with a rotating electrical machine with a relatively low heat generation density, but cooling is insufficient for a rotating electrical machine that has been miniaturized by increasing the heat resistance class such as coil insulation. Is expected to be In addition, in order to arrange two fans in the axial direction, the axial length of the rotating electric machine is increased.

  In a rotating electrical machine, a coil of a stator, which is a heat generating portion, has a temperature distribution that peaks in the axial direction of an iron core of the stator. In order to effectively cool the rotating electrical machine, it is necessary to reduce this peak temperature. For this purpose, it is effective to flow the refrigerant efficiently in the axial direction of the rotating electrical machine.

  An object of the present invention is to provide a rotating electrical machine capable of efficiently flowing a refrigerant in the axial direction and having improved cooling efficiency, and an elevator hoist system provided with the rotating electrical machine.

  A rotating electrical machine according to the present invention comprises a rotor having a rotating shaft, a stator having a coil end, a rotating shaft and a blade provided on the rotating shaft, a fan for flowing a refrigerant, and the rotation of the rotor. And an end bracket provided at both ends in the axial direction which is the extending direction of the shaft. The rotation axis of the fan is substantially parallel to the axial direction. The end brackets each include an opening that opens to the outside. The fan is provided at the opening of one of the end brackets. A distance obtained by adding a radial length of the blade of the fan to a radial distance from the rotary shaft of the rotor to the rotary shaft of the fan is L1. A radial distance from the rotation axis of the rotor to a radial outer end of the coil end is L2. A distance obtained by subtracting the radial length of the blades of the fan from the radial distance from the rotary shaft of the rotor to the rotary shaft of the fan is L3. The distance L1 is longer than the distance L2, and the distance L2 is longer than the distance L3.

  According to the present invention, it is possible to provide a rotating electrical machine capable of efficiently flowing the refrigerant in the axial direction and improving the cooling efficiency, and an elevator hoisting machine system equipped with the rotating electrical machine.

It is a figure which shows the temperature distribution of the axial direction of the coil of a stator measured about the conventional typical rotary electric machine. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which follows the axial direction of the rotary electric machine by Example 1 of this invention. It is sectional drawing which follows the axial direction of the rotary electric machine by Example 1 of this invention, and is a figure which shows the rotary electric machine of a different structure from the rotary electric machine shown in FIG. FIG. 2 is a radial cross-sectional view of the rotating electrical machine according to the first embodiment of the present invention, showing a circumferential position of a fan. It is sectional drawing which follows the axial direction of the rotary electric machine by Example 2 of this invention. It is a fragmentary sectional view of the radial direction of the rotary electric machine by Example 2 of this invention, and is a figure which shows the AA cross section of FIG. It is a fragmentary sectional view of the radial direction of the rotary electric machine by Example 3 of this invention, and is a figure which shows the cross section of the position equivalent to the position of the AA cross section of FIG. It is a fragmentary sectional view of the radial direction of another rotary electric machine by Example 3 of this invention, and is a figure which shows the cross section of the position equivalent to the position of the AA cross section of FIG. It is sectional drawing which follows the axial direction of the rotary electric machine by Example 4 of this invention. It is a fragmentary sectional view of the radial direction of the rotary electric machine by Example 4 of this invention, and is a figure which shows the AA cross section of FIG. It is sectional drawing which follows the axial direction of another rotary electric machine by Example 4 of this invention. It is a fragmentary sectional view of the radial direction of the rotary electric machine shown in FIG. 11, and is a figure which shows the AA cross section of FIG. It is sectional drawing in alignment with an axial direction of the rotary electric machine by Example 5 of this invention. FIG. 7 is a view showing a hoist for elevator system according to a sixth embodiment of the present invention. FIG. 7 shows another elevator hoist system according to Embodiment 6 of the present invention.

  The rotary electric machine includes a rotor and a stator, and the heat generated by the operation is cooled by flowing a refrigerant (for example, air). The stator comprises a coil and a core, and the stator coil is the main heat source of the rotating electrical machine. Hereinafter, the axial direction of the rotating electrical machine (the extending direction of the rotary shaft of the rotor) is simply referred to as "axial direction", and the direction perpendicular to the axial direction is referred to as "radial direction". Is called "circumferential direction".

  FIG. 1 is a diagram showing an axial temperature distribution of coils of a stator measured on a conventional typical rotating electrical machine. The horizontal axis indicates the axial position of the stator, and the vertical axis indicates the temperature of the coils of the stator. In the stator, the refrigerant flowed from the position on the left side of FIG. 1 to the position on the right side.

  As shown in FIG. 1, the temperature of the coils of the stator changes in the axial direction and has a distribution in which peaks occur inside the iron core. In order to make the temperature distribution in the rotating electrical machine uniform, it is necessary to reduce the temperature of this peak. For this purpose, it is considered effective to flow the refrigerant efficiently in the axial direction of the rotating electrical machine.

  In the rotating electrical machine according to the present invention, the arrangement of the cooling fan is optimized so that the refrigerant can easily flow in the axial direction, and the refrigerant can efficiently flow in the axial ventilation path. For this reason, in the rotating electrical machine according to the present invention, the cooling efficiency is improved, and the peak temperature generated inside the iron core of the stator can be reduced.

  For example, a rotating electrical machine used for a high-speed, heavy-duty elevator hoisting machine system is installed in a space having a relatively small area, so that the axial length is short and the radial length is long. There is. In the rotary electric machine having such a large diameter, unless the radial direction position of the cooling fan is specified, the main heat generation sources can not be cooled effectively, and the cooling efficiency is lowered. In the rotating electrical machine according to the present invention, by specifying the radial position of the cooling fan, the refrigerant is efficiently flowed in the axial direction, and the cooling efficiency of the rotating electrical machine is improved.

  In the rotating electrical machine according to the present invention, in order to improve the cooling efficiency, the rotation shaft of the cooling fan is substantially parallel to the axial direction, and the cooling fan introduces the refrigerant from one side in the axial direction to flow along the axial direction. Discharge from the other in the axial direction. The refrigerant does not have to be circulated inside the rotating electrical machine, and flows along the axial direction, and flows out from the rotating electrical machine on the side opposite to the side flowing in the rotating electrical machine, thus efficiently cooling the rotating electrical machine Can.

  Hereinafter, a rotating electrical machine and an elevator hoist system according to an embodiment of the present invention will be described with reference to the drawings. Note that in the drawings used in the present specification, the same elements will be denoted by the same reference symbols, and repeated descriptions of these elements may be omitted.

FIG. 2 is a cross-sectional view along an axial direction of a rotary electric machine according to a first embodiment of the present invention. FIG. 2 shows the upper part of the rotating shaft of the rotating electrical machine (the shaft 8 which is the rotating shaft of the rotor). The rotary electric machine shown in FIG. 2 is mainly used for elevator hoist systems, and is, for example, a rotary electric machine with an output of several hundred kW and a rotational speed several hundred times min ^-1 class, for high speed and heavy load Applies to elevators.

  The rotary electric machine 1 includes, as main parts, a rotor 2, a stator 3, a frame 4, an end bracket 5, a bearing 6, and a fan 7 which is a cooling fan.

  The rotor 2 includes a shaft 8, an iron core 9 and a permanent magnet 10. The shaft 8 is a rotating shaft of the rotor 2, is supported by the bearing 6, and is fastened to the iron core 9 to transmit a rotational torque. The iron core 9 is formed of a magnetic material and can be formed of laminated electromagnetic steel sheets or castings. The permanent magnet 10 is disposed on the outer periphery of the iron core 9. Although not shown in FIG. 2, a protective member such as a metal pipe or fiber reinforced plastic such as carbon fiber is disposed on the outer peripheral portion of the permanent magnet 10. The permanent magnet 10 is protected by this protective member so as not to fall off or scatter. In addition, the permanent magnet 10 may be fixed by an adhesive, an epoxy resin, or the like.

  The stator 3 includes a laminated electromagnetic steel sheet 11 (iron core formed of laminated electromagnetic steel sheets) and a coil 12 and is fastened to the frame 4. The coil 12 is accommodated in a plurality of slots provided in the magnetic steel plate 11 and includes a portion called a coil end 14. At the axial end of the coil 12, a portion projecting in the axial direction from the electromagnetic steel plate 11 is a coil end 14. The stator 3 is disposed radially outside the rotor 2 with a gap 16 provided between the stator 3 and the rotor 2.

  The frame 4 houses the stator 3 and the rotor 2 and connects to the end bracket 5.

  The end bracket 5 is a cover provided at both axial ends of the rotary electric machine 1, and a bearing 6 is provided. One end bracket 5 has an opening 27 opened to the outside of the rotary electric machine 1, and a fan 7 is provided at the opening 27. The other end bracket 5 includes a ventilation path 17 that connects the inside and the outside of the rotary electric machine 1. The ventilation path 17 is an opening that opens to the outside of the rotary electric machine 1.

  The fan 7 is provided at one end in the axial direction of the rotary electric machine 1, that is, at one end bracket 5 in the axial direction, and includes the rotary shaft 13 and the blades 26 provided on the rotary shaft 13. The blades 26 rotate. The rotation axis 13 is substantially parallel to the axial direction. The radial length r of the blade 26 can be arbitrarily determined according to the configuration of the rotary electric machine 1. The fan 7 is an open-type cooler (axial flow fan) which introduces the refrigerant 15 from one of the axial directions and flows along the axial direction when the blades 26 rotate and discharges the refrigerant 15 from the other of the axial directions. . In FIG. 2, the flow of the refrigerant 15 is indicated by an arrow. In the rotating electrical machine 1 shown in FIG. 2, the fan 7 introduces the coolant 15 from the opening 27 of one end bracket 5 into the inside of the rotating electrical machine 1, flows the coolant 15 through the gap 16, and Are discharged from the inside of the rotary electric machine 1. The fan 7 is preferably driven by a power supply different from the power supply that drives the rotating electrical machine 1. However, the same power supply as the power supply for driving the rotary electric machine 1 can also be used to drive the fan 7.

  The radial position of the fan 7 will be described. As shown in FIG. 2, a distance obtained by adding the radial length r of the blades 26 of the fan 7 to the radial distance from the shaft 8 to the rotational shaft 13 of the fan 7 is L1, and the radial direction of the shaft 8 to the coil end 14 The distance in the radial direction to the outer end portion is L2, and the distance in which the radial length r of the blades 26 of the fan 7 is subtracted from the distance in the radial direction from the shaft 8 to the rotation shaft 13 of the fan 7 is L3. The fan 7 is provided on the end bracket 5 such that the radial position of the rotating shaft 13 satisfies the relationship of L1> L2> L3. In other words, the fan 7 is provided at a position axially opposed to the coil end 14. Since the distance L1 is longer than the distance L2 and the distance L2 is longer than the distance L3, the radially outer end of the coil end 14 is within the range where the blades 26 of the fan 7 exist in the radial direction (the diameter from the shaft 8 A radial range between a position separated by a distance L1 in the direction and a position separated by a distance L3 in the radial direction from the shaft 8).

  By arranging the fan 7 at such a radial position, the refrigerant 15 can be allowed to flow directly to a portion (coil 12) where copper loss and iron loss which are heat sources are generated. In the rotating electrical machine having a large diameter, the radial distance from the rotation center (shaft 8) to the heat generating portion (coil 12) is long. In the case of such a rotating electrical machine, in particular, if the fan 7 is disposed at the above-described radial position, the heat generation portion can be efficiently cooled.

  Since the fan 7 is provided at the opening 27 of the end bracket 5 on one side in the axial direction, the outside air can be positively introduced into the rotary electric machine 1 as the refrigerant 15, and the rotary electric machine 1 can be cooled more efficiently. can do.

  The other end bracket 5 in the axial direction includes a ventilation path 17 for discharging the refrigerant 15 from the inside of the rotary electric machine 1. The radial position of the air passage 17 is preferably a position facing the coil end 14 in the axial direction, considering that the coolant 15 flows efficiently in the axial direction. Alternatively, the radial position of the air passage 17 may be a position axially opposed to the fan 7. If the air passage 17 is provided at such a radial position, the refrigerant 15 introduced by the fan 7 flows in the axial passage (in the present embodiment, the gap 16) and is easily discharged from the air passage 17. , Improve the cooling efficiency.

  The rotating electrical machine 1 according to the present embodiment includes a permanent magnet 10 on the surface of the rotor 2 (the outer peripheral side of the iron core 9). Therefore, the permanent magnet 10 is close to the gap 16 between the rotor 2 and the stator 3 and also close to the stator 3 which is a main heat generation source. Therefore, in the rotary electric machine 1 according to the present embodiment, the permanent magnet 10 can also be effectively cooled by the fan 7. The effect of cooling the stator 3 which is a heat source does not depend on the position of the permanent magnet 10 of the rotor 2. For example, even when the rotor 2 includes the permanent magnet 10 embedded in the core 9, the effect of cooling the stator 3, which is a heat source, is the same as that of the rotary electric machine 1 according to the present embodiment.

  FIG. 3 is a cross-sectional view along the axial direction of the rotary electric machine 1 according to the first embodiment of the present invention, showing the rotary electric machine 1 having a configuration different from that of the rotary electric machine 1 shown in FIG. In the rotary electric machine 1 shown in FIG. 3, the end bracket 5 including the fan 7 includes the air passage 37. The ventilation path 37 is an opening that opens to the outside of the rotary electric machine 1, is not provided with the fan 7, and is provided at an arbitrary position radially inward of the opening 27 in which the fan 7 is provided. The rotary electric machine 1 shown in FIG. 3 has a circulation portion (introduction portion or discharge portion) of more outside air (refrigerant 15) than the rotary electric machine 1 shown in FIG. 2, and the cooling efficiency is further improved.

  FIG. 4 is a radial cross-sectional view of the rotary electric machine 1 according to the first embodiment of the present invention, showing the circumferential position of the fan 7. The rotary electric machine 1 can include a plurality of fans 7 in the circumferential direction. FIG. 4 shows an example in which the rotating electrical machine 1 includes four fans 7. The radial position of the fan 7 is as described above. When the number of fans 7 is increased, the amount of the refrigerant 15 flowing inside the rotary electric machine 1 can be increased, and the cooling efficiency can be further improved.

  The number of fans 7 provided in the rotary electric machine 1 can be determined according to the size of the fans 7 and the amount of the required refrigerant 15. The number of air passages 37 provided in the end bracket 5 can also be determined in accordance with the area of the air passages 37 and the amount of the refrigerant 15 required. The circumferential positions of the fan 7 and the air passage 37 can be arbitrarily determined, and may be identical to each other as shown in FIG. 4 or may be different from each other.

  Although the end bracket 5 includes the four ventilation paths 37 in FIG. 4, the end bracket 5 may not include the ventilation path 37 as in the rotation electrical machine 1 illustrated in FIG. 2.

  In the rotary electric machine 1 according to the present embodiment, as shown by the arrows in FIG. 2, the push-in fan 7 is used. Even if the retractable fan 7 is used, the same effect as the case where the push-in fan 7 is used can be obtained. Further, in the rotary electric machine 1 according to the present embodiment, the fan 7 is installed only in one end bracket 5 in the axial direction, but the fan 7 is installed in both end brackets 5 in the axial direction, and one fan 7 is installed. Even if the push-in type is adopted and the other fan 7 is drawn-in type, the effect exerted by the rotary electric machine 1 according to the present embodiment can be sufficiently obtained.

  FIG. 5 is a cross-sectional view along an axial direction of a rotary electric machine 1 according to a second embodiment of the present invention. The rotating electrical machine 1 according to the present embodiment includes a back duct 18 between the stator 3 and the frame 4 in the configuration of the rotating electrical machine 1 (for example, FIG. 2) according to the first embodiment. The rear duct 18 extends in the axial direction from one end of the stator 3 to the other end, and is a ventilation path through which the refrigerant 15 flows. In FIG. 5, the flow of the refrigerant 15 is indicated by an arrow. The rotary electric machine 1 can include one or more back ducts 18 in the circumferential direction.

  The radial position of the fan 7 is the same as that described in the first embodiment. In the rotary electric machine 1 according to the present embodiment, the refrigerant 15 flows in the axial direction through the back duct 18 and the gap 16. For this reason, in the present embodiment, the refrigerant 15 can be flowed in a well-balanced manner inside the rotary electric machine 1, and the cooling efficiency of the rotary electric machine 1 can be further improved.

  For example, when it is desired to increase the flow rate of the refrigerant 15 flowing through the rear duct 18, the fan 7 may be located at a position closer to the rear duct 18 in the radial direction (a position where the fan 7 axially faces the rear duct 18 or Should be installed near the When it is desired to increase the flow rate of the refrigerant 15 flowing through the gap 16, the fan 7 is positioned at a position closer to the gap 16 in the radial direction (a position where the fan 7 axially faces the gap 16 or a position near this position). It should be installed. That is, as long as the relationship of L1> L2> L3 described in the first embodiment is established, the radial position of the fan 7 can be adjusted in accordance with the position where the flow rate of the refrigerant 15 is to be increased. This is equivalent to determining the appropriate radial position of the fan 7 in consideration of the dynamic pressure of the fan 7.

  FIG. 6 is a partial cross-sectional view in the radial direction of the rotary electric machine 1 according to a second embodiment of the present invention, and shows an AA cross section of FIG. The rotary electric machine 1 shown in FIG. 6 is provided with the rear duct 18 between the stator 3 and the frame 4 by providing the convex portion 19 and the concave portion 20 in the radial direction on the inner peripheral portion of the frame 4. The convex portion 19 contacts the stator 3 to fix the stator 3. The recess 20 does not contact the stator 3 and forms a back duct 18 with the stator 3. The convex portion 19 and the concave portion 20 can be provided, for example, by making the shape of the inner peripheral portion of the frame 4 uneven.

  The rear duct 18 is provided with a convex portion 19 on the inner peripheral portion of the frame 4 with a component such as a key or the like, and the outer peripheral portion of the stator 3 is formed into an uneven shape. It may be provided between them.

  The rotary electric machine 1 according to the present embodiment reduces the peak temperature (see FIG. 1) of the coil 12 located inside the electromagnetic steel sheet 11 (iron core) of the stator 3 and improves the cooling efficiency of the rotary electric machine 1. It is effective. Since the refrigerant 15 flows to the back duct 18 and the gap 16 and the outer peripheral portion and the inner peripheral portion of the coil end 14 contact the refrigerant 15, the temperature of the coil 12 can be efficiently reduced. Although the rotating electrical machine 1 shown in FIG. 6 has 56 poles and 72 slots, the effect of this embodiment can be obtained even if the number of poles and the number of slots are other values. Moreover, in the rotary electric machine 1 shown in FIG. 6, although the winding system of the coil 12 is concentrated winding, winding systems other than this may be used.

  7 is a partial cross-sectional view in the radial direction of a rotary electric machine 1 according to a third embodiment of the present invention, and shows a cross section at a position corresponding to the position of the A-A cross section in FIG. In the configuration of the rotary electric machine 1 (for example, FIG. 2, FIG. 5) according to the first embodiment and the second embodiment, the iron core 9 of the rotor 2 includes the axial duct 21. FIG. 7 shows a configuration in which the rotary electric machine 1 according to the second embodiment includes the axial duct 21 as an example. The axial duct 21 is a hollow that extends in the axial direction from one end of the rotor 2 to the other end, and is a ventilation path through which the refrigerant 15 flows.

  In the rotating electrical machine 1 according to the first embodiment to the second embodiment, the heat radiation path of the permanent magnet 10 is only the gap 16. In the rotary electric machine 1 according to the present embodiment, the iron core 9 of the rotor 2 is provided with the axial duct 21 and the heat radiation path is also provided inside the permanent magnet 10 in the radial direction, so the temperature of the permanent magnet 10 is further reduced. The cooling efficiency of the rotary electric machine 1 can be further improved. In addition, since the mass of the iron core 9 is reduced because the axial duct 21 is a hollow, the mass of the rotor 2 can be reduced.

  8 is a partial cross-sectional view in the radial direction of another rotary electric machine 1 according to a third embodiment of the present invention, and shows a cross section at a position corresponding to the position of the A-A cross section in FIG. The rotary electric machine 1 shown in FIG. 8 includes a spoke-shaped rotor 2. That is, the rotor 2 includes a plurality of spokes 22 arranged in the circumferential direction, and the spokes 22 which are rod-like members connect the shaft 8 and the iron core 9. In the rotary electric machine 1 shown in FIG. 8, the gap between the spokes 22 and the spokes 22 is an axial duct 21.

  The rotary electric machine 1 shown in FIG. 8 has a large cross-sectional area perpendicular to the axial direction of the axial duct 21 as compared with the rotary electric machine 1 shown in FIG. 7, so the amount of the refrigerant 15 flowing through the axial duct 21 is large. The temperature of 10 can be further reduced, and the cooling efficiency of the rotating electrical machine 1 can be further improved. Further, since the rotating electric machine 1 shown in FIG. 8 can adjust the distance between the shaft 8 and the iron core 9 by the length of the spokes 22, the diameter of the shaft 8 can be minimized. The rotary electric machine 1 shown in FIG. 8 can reduce the amount of the material constituting the rotor 2 by providing the plurality of spokes 22, so that the mass of the rotor 2 can be reduced.

  FIG. 9 is a sectional view along the axial direction of a rotary electric machine 1 according to a fourth embodiment of the present invention. The rotating electrical machine 1 according to the present embodiment includes cooling fins 23 on the outer peripheral portion of the frame 4 in the configuration of the rotating electrical machine 1 (for example, FIG. 2, FIG. 5, FIG. 7, FIG. 8) according to the first to third embodiments. . FIG. 9 shows, as an example, a configuration in which the rotary electric machine 1 according to the third embodiment includes the cooling fins 23. The cooling fin 23 is a protrusion that protrudes radially outward, and extends in the axial direction. It is preferable that a plurality of cooling fins 23 be provided in the circumferential direction.

  FIG. 10 is a partial cross-sectional view in the radial direction of the rotary electric machine 1 according to the present embodiment, and shows an AA cross section in FIG. The circumferential position of the cooling fin 23 is radially outside the position where the stator 3 and the frame 4 (in the example shown in FIG. 10, the stator 3 and the convex portion 19) are in contact. By providing the cooling fins 23 at this position, the heat of the stator 3 can be efficiently conducted to the cooling fins 23 through the frame 4 by heat conduction. Moreover, the surface area of the outer periphery of the frame 4 can be increased by the cooling fins 23, and the heat radiation effect from the frame 4 by forced convection and natural convection can be enhanced.

  FIG. 11 is an axial sectional view of another rotating electrical machine 1 according to a fourth embodiment of the present invention. The rotary electric machine 1 shown in FIG. 11 is provided with a groove 28 recessed inward in the radial direction on the outer peripheral portion of the frame 4. The groove 28 preferably extends annularly in the circumferential direction, and a plurality of grooves 28 are preferably provided in the axial direction.

  12 is a partial cross-sectional view in the radial direction of the rotary electric machine 1 shown in FIG. 11, and shows an AA cross section in FIG. The circumferential position of the groove portion 28 is radially outside the position where the stator 3 and the frame 4 (in the example shown in FIG. 12, the stator 3 and the convex portion 19) are in contact. If the groove 28 is provided at this position, the effect of being able to enhance the heat radiation effect from the frame 4 can be obtained as in the case of the cooling fin 23 described above.

  The cooling fins 23 may extend annularly in the circumferential direction, and the grooves 28 may extend in the axial direction. Alternatively, the cooling fins 23 may be formed by providing a recessed portion which is recessed inward in the radial direction on the outer peripheral portion of the frame 4, and the groove portion 28 extends radially outward on the outer peripheral portion of the frame 4. It may be formed by providing a protruding portion. In this embodiment, the surface area of the outer periphery of the frame 4 is increased by providing the uneven portion in the radial direction on the outer peripheral portion of the frame 4 to enhance the heat dissipation effect from the frame 4 and improve the cooling efficiency of the rotating electrical machine 1 .

  The extending direction of the cooling fin 23 and the groove portion 28 can be determined according to the direction of the refrigerant flowing to the outside of the rotary electric machine 1. For example, the cooling fins 23 and the groove portions 28 are provided so as to extend in the axial direction when the refrigerant flows in the axial direction outside the rotary electric machine 1, and the refrigerant flows in the direction perpendicular to the axial direction outside the rotary electric machine 1 In this case, if the coolant is provided so as to extend in the circumferential direction, the refrigerant can easily flow along the cooling fins 23 and the groove portion 28, and thus it is effective to improve the cooling efficiency of the rotary electric machine 1.

  FIG. 13 is a sectional view along the axial direction of a rotary electric machine 1 according to a fifth embodiment of the present invention. The rotating electrical machine 1 according to this embodiment is the same as the rotating electrical machine 1 according to the first to fourth embodiments (for example, FIG. 2, FIG. 5, FIG. 7, FIG. 7, FIG. 8, FIG. A cooling fin 29 is provided on the surface. FIG. 13 shows a configuration in which the rotating electrical machine 1 according to the first embodiment (FIG. 2) includes the cooling fins 23 as an example. The cooling fins 29 are protrusions projecting outward in the axial direction. It is preferable that a plurality of cooling fins 29 be provided. By providing the cooling fins 29, the rotary electric machine 1 improves the heat exchange efficiency between the refrigerant 15 warmed inside and the outside of the rotary electric machine 1, and can effectively lower the temperature of the refrigerant 15 inside.

  The position and the extending direction of the cooling fins 29 in the outer surface of the end bracket 5 can be arbitrarily determined, for example, according to the direction of the refrigerant flowing to the outside of the rotary electric machine 1 as described in the fourth embodiment. It can be determined. Further, the cooling fins 29 may be provided on both end brackets 5 in the axial direction, or may be provided on only one of the end brackets 5.

  The sixth embodiment of the present invention shows an example in which the rotating electrical machine 1 according to the embodiment of the present invention is applied to a hoist for elevator system. In the elevator hoisting machine system according to the present embodiment, since the rotary electric machine 1 can efficiently flow the refrigerant in the axial direction, the cooling efficiency of the rotary electric machine 1 is improved.

  FIG. 14 is a view showing a hoist for elevator system according to a sixth embodiment of the present invention. The elevator hoisting system according to the present embodiment includes a rotating electric machine 1, a hoisting machine 24, and a coupling 25. The rotating electrical machine 1 is the rotating electrical machine 1 according to any one of the first to fifth embodiments. The winding machine 24 comprises a sheave. The rotary electric machine 1 is connected to the sheave of the winding machine 24 via a coupling 25 to drive the winding machine 24. In the rotary electric machine 1 shown in FIG. 14, the bearings 6 for supporting the shaft 8 are provided at both axial end portions of the rotary electric machine 1.

  FIG. 15 is a view showing another elevator hoist system according to Embodiment 6 of the present invention. The rotary electric machine 1 is connected to the sheave of the winding machine 24 via a coupling 25 to drive the winding machine 24, but the bearing 6 is provided only at one end in the axial direction. That is, the rotary electric machine 1 shown in FIG. 15 does not include the bearing 6 on the side close to the winding machine 24 in the axial direction, but includes only the bearing 6 on the side far from the winding machine 24. The elevator hoisting system shown in FIG. 15 has a structure in which the hoisting machine 24 supports one axial end of the rotary electric machine 1. Such a structure can reduce the size of the elevator hoist system. Further, since the bearing 6 is not provided at one end side in the axial direction, the effect of reducing the number of parts of the rotary electric machine 1 can also be obtained.

  The present invention is not limited to the above embodiments, and various modifications are possible. For example, the above embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to the aspect having all the described configurations. Also, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. In addition, it is possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to delete part of the configuration of each embodiment or to add or replace another configuration.

  DESCRIPTION OF SYMBOLS 1 ... rotation electric machine, 2 ... rotor, 3 ... stator, 4 ... frame, 5 ... end bracket, 6 ... bearing, 7 ... fan, 8 ... shaft, 9 ... iron core, 10 ... permanent magnet, 11 ... electromagnetic steel plate, 12: coil, 13: rotating shaft, 14: coil end, 15: refrigerant, 16: gap, 17: ventilating path, 18: back duct, 19: convex portion on the inner diameter side of the frame, 20: concave portion on the inner diameter side of the frame , 21 ... axial duct, 22 ... spoke, 23 ... cooling fin, 24 ... winding machine, 25 ... coupling, 26 ... vane, 27 ... opening, 28 ... groove, 29 ... cooling fin, 37 ... air passage.

Claims (7)

A rotor comprising a rotating shaft,
A stator comprising a coil end,
A fan including a rotating shaft and a blade provided on the rotating shaft, for flowing the refrigerant;
End brackets provided at both axial end portions of the rotor in the extending direction of the rotation shaft;
Equipped with
The rotation axis of the fan is substantially parallel to the axial direction,
The end brackets each include an opening that opens to the outside,
The fan is provided at the opening of the one end bracket,
A distance obtained by adding a radial length of the blade of the fan to a radial distance from the rotary shaft of the rotor to the rotary shaft of the fan is L1.
A radial distance from the rotation axis of the rotor to a radial outer end of the coil end is L2.
Let L3 be a distance obtained by subtracting the radial length of the blades of the fan from the radial distance from the rotary shaft of the rotor to the rotary shaft of the fan,
The distance L1 is longer than the distance L2,
The distance L2 is longer than the distance L3,
A rotating electrical machine characterized by The end bracket provided with the fan includes an opening that opens to the outside and is not provided with the fan.
The rotary electric machine according to claim 1. A frame for housing the stator and the rotor;
Between the stator and the frame, there is provided an air passage which extends in the axial direction from one end of the stator to the other end and through which the refrigerant flows.
The rotary electric machine according to claim 1. The rotor includes an air passage which extends in the axial direction from one end of the rotor to the other end and through which the refrigerant flows.
The rotary electric machine according to claim 1. A frame for housing the stator and the rotor;
The frame is provided with an uneven portion in the radial direction on the outer peripheral portion.
The rotary electric machine according to claim 1. The end bracket includes fins projecting outward in the axial direction on an outer surface thereof.
The rotary electric machine according to claim 1. A hoist equipped with a sieve,
A rotating electrical machine connected to the sheave;
Equipped with
The rotating electrical machine is the rotating electrical machine according to any one of claims 1 to 6,
A hoisting machine system for an elevator characterized by

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