JP6480832B2 - Rotating electric machine and elevator hoisting machine and elevator using the same - Google Patents

Description

  The present invention relates to a rotary electric machine, and an elevator hoisting machine and an elevator using the same.

  In recent years, elevator hoisting machines are required to be thinner and smaller in order to limit installation space, reduce constituent materials, reduce power energy, and the like. However, if the motor is made thinner or smaller, the heat dissipation area also decreases, so the temperature of the exciting coil and the temperature of the magnet excessively rise, causing problems such as dielectric breakdown of the exciting coil and demagnetization of the magnet. There is a possibility that the performance of On the other hand, as a technique for obtaining a cooling effect in an elevator hoist, a conventional technique described in Patent Document 1 is known.

  In this prior art, a sheave that is rotatably attached to a fixed shaft via a bearing, a rotor that rotates integrally with the sheave, and a stator that is provided on the inner diameter side of the rotor so as to face the rotor. In the outer rotor type elevator hoisting machine provided with the above, a plurality of radiating fins are provided on the inner diameter side of the stator core back for conducting and radiating heat generated in the stator. Since the heat generated in the stator is dissipated by the radiating fins, a cooling effect can be obtained without taking wind into the windings and the iron core, and thus without flowing dust.

  Furthermore, in this prior art, a ventilation fan is provided between the heat radiating fin and the rib of the sheave, and a flow of wind passing through the ventilation port provided in the rib is caused. Thereby, it can cool more effectively.

JP 2005-104620 A

  In the heat radiation by the heat radiating fins in the above prior art, the cooling performance may be insufficient when the electric motor is thinned or miniaturized to increase the heat generation density. In addition, when a blower fan is provided, it is difficult to reduce the size and thickness of the hoist.

  Therefore, the present invention provides a rotating electrical machine that can improve cooling performance while suppressing inflow of dust and the like even if it is reduced in size or thickness, and an elevator hoisting machine and an elevator using the rotating electrical machine.

In order to solve the above problems, a rotating electrical machine according to the present invention includes a stator having a stator core, an excitation coil provided on the stator core, and a first support that supports the stator core and the excitation coil, a magnetic pole portion, and a magnetic pole. A rotor having a second support body that supports the portion, and the stator and the rotor are arranged such that the stator core and the magnetic pole portion face each other with a gap therebetween. In the space defined by the support and the second support, the stator core and the excitation coil are located inside the partial space closed by the first support and the second support, and in the remaining partial space. while positions, located on the inner peripheral side of the stator core and the excitation coil, and having a plurality of blades, it includes a blower blades rotating with the rotation of the rotor, by the rotation of the blower blades , Air flow toward the opposite direction is generated in the direction from the air blowing blades to the load connection portion of the rotor, the first support is in the interior of the remainder of the space has an inclined portion extending the inner diameter toward the opposite direction .

  In order to solve the above-described problem, an elevator hoisting machine according to the present invention includes a sheave around which an elevator main rope is wound, and a rotating electrical machine unit that rotates the sheave, and the rotating electrical machine unit Comprises the rotating electrical machine according to the present invention.

  Furthermore, in order to solve the above problems, an elevator according to the present invention includes a car and a counterweight, a main rope that suspends the car and the counterweight in the hoistway, and a hoisting machine that drives the main rope. The hoisting machine includes a sheave around which a main rope is wound, and a rotating electrical machine unit that rotates the sheave, and the rotating electrical machine unit includes the rotating electrical machine according to the present invention.

  According to the present invention, in the space defined by the first support body and the second support body, the stator core, the windings and the blower blades are located, and the partial space where the stator core and the exciting coil are located is closed. Therefore, while providing the blower blades, the rotating electrical machine can be reduced in size or thickness, and dust can be prevented from adhering to the stator core and the exciting coil. Therefore, it is possible to improve the cooling performance without reducing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS The outline of the whole structure of the elevator which is Example 1 of this invention is shown. It is the side external view seen along the axial direction which shows schematic structure of a winding machine. It is an external appearance perspective view of a hoisting machine. It is an exploded view of an electric motor part. It is a perspective view which shows the flow of the air of the ventilation blade vicinity produced when a rotor rotates. The cross section of the electric motor cut | disconnected by AA in FIG. 5 is shown. It is a perspective view which shows the flow of the air which peeled from the ventilation blade. The cross section of the electric motor cut | disconnected by AA in FIG. 7 is shown. It is a perspective view which shows the flow of the air between a radiation fin. The cross section of the electric motor cut | disconnected by AA in FIG. 9 is shown. It is an external appearance perspective view of the winding machine which is Example 2. FIG. The cross section cut | disconnected by AA in FIG. 11 is shown. It is a perspective view which shows the external appearance of the winding machine which is Example 3, and an axial direction cross section. Only the axial cross section in FIG. 13 is shown. It is a perspective view which shows the external appearance of the winding machine which is Example 4, and an axial direction cross section. Only the axial cross section in FIG. 15 is shown. It is an external appearance perspective view of the winding machine which is Example 5. FIG. The cross section cut | disconnected by AA in FIG. 17 is shown. It is an external appearance perspective view of the winding machine which is Example 6. FIG. The cross section cut | disconnected by AA in FIG. 19 is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same reference numerals indicate the same constituent elements or constituent elements having similar functions.

  FIG. 1 schematically shows the overall configuration of an elevator that is Embodiment 1 of the present invention.

  As shown in FIG. 1, a hoisting machine 120 is placed in a machine room 110 provided at the top of a hoistway 100 provided in a building, and is fixed to the machine room floor by a fixing means. The hoisting machine 120 has a sheave for suspending a plurality of main ropes 130. One end of the main rope 130 extending from the sheave is connected to the upper end of the counterweight 150 via a warp pulley 140, and the other end is connected to the upper end of the car 160. The car 160 and the counterweight 150 are suspended in the hoistway 100 by the main rope 130 wound around the sheave.

  When the hoisting machine 120 is operated and the sheave rotates, the main rope 130 is driven along the rotation direction of the sheave by the friction between the main rope 130 and the sheave at that time. The counterweight 150 and the car 160 are moved up and down by the movement of the main rope 130. Although omitted in FIG. 1, a guide rail for guiding the car 160 and the counterweight 150 is provided in the hoistway 100 in order to make the car 160 and the counterweight 150 rise and fall smoothly. It is done.

  In such an elevator, an operation command is given to an electric motor, a braking mechanism, and the like that constitute the hoisting machine 120 by a control device (not shown), and the car 160 moves up and down toward a predetermined floor of the building by the operation command. Operate.

  In the first embodiment, the hoisting machine 120 is placed in the machine room 110, but the hoisting machine 120 may be partly or entirely placed in the hoistway 100.

  Next, the configuration of the hoisting machine 120 will be described.

  FIG. 2 is an external view of the side portion seen along the axial direction showing a schematic configuration of the hoisting machine 120.

  As shown in FIG. 2, the hoisting machine 120 includes an electric motor 12, a sheave 13 that is mechanically coaxially connected to the rotor of the electric motor 12, and a shaft 20 that rotatably supports the rotor and the sheave 13. A braking device 15 that restrains the rotation of the sheave and a pair of bearing bases 14A and 14B that fixedly support both ends of the shaft 20 are provided. In the first embodiment, the sheave 13 is configured integrally with the rotor of the electric motor 12, but the sheave 13 configured separately from the rotor may be fixed to the rotor. The hoisting machine 120 is placed on the base 11 and is placed and fixed on a machine beam (not shown) that functions as a placing member on the base 11.

  The electric motor 12 is installed on the base 11. The electric motor 12 is configured integrally with the sheave 13 as described above, and the sheave 13 is attached to the shaft 20 supported by the bearing bases 14A and 14B via a rotary bearing having a bearing. When the electric motor 12 is driven to rotate, the sheave 13 rotates accordingly, and the main rope 130 (FIG. 1) suspended from the sheave 13 is driven.

  The bearing bases 14 </ b> A and 14 </ b> B are an electric motor side bearing base and a brake disk side bearing base, respectively, and are both supported by the base 11. The bearing stand 14 </ b> A supports the end portion on the electric motor 12 side in the axial direction of the shaft 20. Further, the bearing stand 14 </ b> B supports an end portion of the shaft 20 opposite to the electric motor 12 in the axial direction and a brake disk 16 that is braked by the brake mechanism 15. In the first embodiment, the shaft 20 is supported by the two bearing bases 14A and 14B. However, the shaft 20 may be supported by one bearing base.

  The sheave 13 has a cylindrical shape, and a through hole (not shown) is formed at the center of the shaft. The diameter of the through hole is substantially equal to the outer diameter of the shaft 20. The shaft 20 passes through the through hole of the sheave 13 and is fixed to the bearing bases 14A and 14B. A winding portion 21 around which the main rope 130 is wound is formed on the outer peripheral surface portion of the sheave 13. The winding portion 21 has a plurality of rope storage grooves 21a around which the main rope 130 is wound. As the sheave 13 rotates, the rope storage groove 21 a of the winding portion 21 winds up the main rope 130. Moreover, the outer peripheral side protrusion part 22 is provided in the edge part by the side of the electric motor 12 in the axial direction of the sheave 13, and the flange part 23 is provided in the other side.

  The outer peripheral side protruding portion 22 is formed at an end portion in the axial direction of the sheave 13, protrudes outward in the radial direction of the sheave 13, and has a diameter larger than the outer diameter of the winding portion 21 of the sheave 13. Thereby, it can prevent that the main rope 130 wound on the winding part 21 comes off.

  The flange portion 23 is disposed at the other end portion of the sheave 13 opposite to the electric motor 12 side, and the flange portion 23 projects outward in the radial direction of the sheave 13. The outer diameter of the flange portion 23 is set larger than the outer diameter of the outer peripheral side protruding portion 22. A fitting portion 24 is provided between the flange portion 23 and the winding portion 21 of the sheave 13.

  The brake disc 16 is fixed to the fitting portion 24 by press-fitting, and the outer diameter of the fitting portion 24 is set larger than the diameter of the outer peripheral protruding portion 22. The length of the fitting portion 24 in the axial direction is the same as or slightly longer than the length of the brake disc 16 in the axial direction. The brake disc 16 rotates integrally with the sheave 13 rotated by the electric motor 12.

  When a control drive current flows through a brake coil (not shown) built in the braking device 15, the brake coil is excited and the brake shoe 17 is separated from the brake disk 16 to be opened, and the drive sheave 13 is rotated by the electric motor 12. When driven, the main rope 130 can be wound or unwound. On the other hand, when the control drive current is interrupted, the brake coil is demagnetized, and the brake shoe 17 sandwiches the brake disc 16 by a brake spring (not shown), thereby generating a braking force and stopping the rotation of the drive sheave 13.

  Next, the electric motor in the hoisting machine 120 according to the first embodiment will be described with reference to FIGS.

  FIG. 3 is an external perspective view of the hoisting machine 120. FIG. 4 is an exploded view of the motor portion. 3 and 4 show the configuration of each part other than the motor part in a simplified manner as compared with FIG. 2 (the same applies to the figures after FIG. 5).

  As shown in FIGS. 3 and 4, the outer peripheral portion of the rotor 30 is located outside the outer peripheral portion of the stator 31 in the radial direction of the electric motor 12. That is, the electric motor 12 in the first embodiment is an outer rotor type electric motor. Moreover, the electric motor 12 is a flat cylindrical shape, and is a thin electric motor whose height dimension of a cylinder is smaller than a radial dimension. As described above, the sheave 13 is configured integrally with the rotor 30 and protrudes from the rotor 30 in the motor shaft direction. The sheave 13 is rotatably supported by a shaft 20 via a bearing (not shown), and the shaft 20 is fixed to a bearing base 14A on the motor side and a bearing base 14B on the brake disk side.

  As shown in FIG. 4, the stator 31 includes a frame 32 and an end bracket 33, a stator core 34 supported by the frame 32 and the end bracket 33, and heat radiating fins 36 provided on the inner peripheral side of the stator core. . Here, the frame 32 and the end bracket 33 have a cylindrical shape in which the frame 32 is a side surface portion, the end bracket 33 is a bottom portion, and the opposite side of the end bracket 33 is open. The stator core 34 and the heat radiating fins 36 each have an annular shape, and are attached to the frame 32 coaxially with the frame 32. The end bracket 33 includes a plurality of openings 35A arranged in an annular space near the shaft 20 on the inner peripheral side of the radiating fin 36, and an inner peripheral side of the radiating fin 36 and the opening 35A. A plurality of openings 35 </ b> B are provided on the outer peripheral side and arranged in an annular shape at intervals. In the opening portion 35B, the end portion of the heat radiating fin 36 may be exposed. The opening 35A serves as an inlet for cooling air, and the opening 35B serves as an outlet for cooling air, that is, an outlet for airflow (AF4 in FIG. 9) generated by a blower blade 41 as described later. In addition, as long as these openings 35A and 35B are independently formed at least one place, the shape, number, area, and the like can be set as appropriate.

  The stator core 34 includes a tooth not shown in FIG. 4 and an annular stator core back 38. An exciting coil 37 is wound around the teeth. The stator core back 38 is located on the inner peripheral side of the stator core 34, and is fixed to an annular stator core support portion 32a in the frame 32, and the exciting coil 37 is fixed by being wound around a plurality of teeth. The stator core 34 is made of a magnetic material, for example, a laminated body of magnetic steel plates such as silicon steel plates. A plurality of heat radiation fins 36 are fixedly installed on the inner peripheral surface of the stator core support portion 32a located on the inner peripheral side of the stator core back 38 by fixing means such as welding, adhesion, or bolting. Here, the radiation fin 36 has a flat plate shape. In the first embodiment, the plane of the radiating fin 36 faces the circumferential direction, but it may face the rotation axis direction. The shape of the radiating fin is not limited to a flat plate shape, but may be a spiral shape or a pin shape.

  The rotor 30 includes a cylindrical frame 39, a permanent magnet 40 that forms a magnetic pole portion that is supported by the frame 39 and generates a magnetic flux, a boss portion through which a rotation shaft (not shown) passes, and a boss portion and the frame 39 that are illustrated. It is comprised from the support member which is not carried out, and the ventilation blade 41 which is mentioned later. The rotor 30 is rotatably supported via the bearings on the shaft 20 whose both ends are fixed by the bearings 14A and 14B.

  The air blowing blade 41 is located in a space between the frame 39 and the shaft 20 in the rotor 30 and in a space adjacent to the sheave 13. Further, in the state where the rotor 30 and the stator 31 are assembled, the blower blade 41 is in a space defined by the frame 32 and the end bracket 33 of the stator 31 and the frame 39 of the rotor 30, and the stator core support portion 32 a and the radiating fins 36. And is located in the partial space between the shaft 20. Therefore, when the blower blade 41 rotates with the rotation of the rotor 30, the air in the space between the stator core support portion 32 a and the radiation fin 36 and the shaft 20 is agitated by the blower blade 41. In addition, since special space is not required in order to provide the ventilation blade 41, the increase in the size of an electric motor is suppressed.

  In the first embodiment, the blower blade 41 has a plurality of blades made of a flat plate member. The flat member, that is, the plane of the blade extends in the direction of the rotation axis or the central axis of the shaft 20. That is, the normal direction of the plane of the blade and the direction of the rotation axis or the direction of the central axis of the shaft 20 form a right angle. Further, the flat surface of the flat plate member extends in the radial direction from the center of rotation. Accordingly, the blower blade 41 rotates in a direction perpendicular to the flat plate member, that is, the plane of the blade. For this reason, the stable ventilation volume which does not depend on a rotation direction can be obtained. Here, the planar shape of the blades of the blower blades is a rectangle in the first embodiment, but is not limited thereto, and may be a trapezoidal shape, a triangular shape, or the like. Moreover, if the air in the space between the stator core support part 32a and the radiation fin 36 and the shaft 20 is agitated, the blower blades may be located in the sheave 13 adjacent to and continuous with this space.

  In a state in which the rotor 30 and the stator 31 are assembled, the stator core 34 including the permanent magnet 40 and the exciting coil 37 is formed in the space defined by the frame 32 of the stator 31 and the end bracket 33 and the frame 39 of the rotor 30. 32, the end bracket 33, the stator core support portion 32a, and a frame 39 surrounded and closed by a partial space, and is substantially sealed in the partial space. That is, the permanent magnet 40 and the stator core 34 are located in the remaining partial space excluding the partial space where the blower blades 41 described above are located.

  To make the rotor 30 rotatable between the magnetic pole part of the frame 39 of the rotor 30 and the frame 32 of the stator 31 and between the frame 39 of the rotor 30 and the stator core support part 32a of the stator 31. The minimum necessary gap including tolerance is provided. These gaps are substantially narrow spaces, and the flow path resistance of the air stirred by the blower blades 41 is higher than the flow path resistance in the space where the blower blades 41 are located. For this reason, the air stirred by the blower blades 41 hardly flows into the space where the permanent magnet 40 and the stator core 34 are located. Thereby, dust such as dust is prevented from entering the space where the permanent magnet 40 and the stator core 34 are located, so that it is possible to prevent performance deterioration and failure of the rotating electrical machine due to the dust.

  In a state where the rotor 30 and the stator 31 are assembled, the magnetic pole surface of the permanent magnet 40 and the stator core 34 of the stator 31 face each other with a predetermined gap in the radial direction of the rotating electrical machine. That is, the rotating electrical machine of the first embodiment is a so-called radial gap type permanent magnet synchronous motor. Further, since the permanent magnet 40 is provided on the inner peripheral surface of the rotor 30, the rotating electrical machine of the first embodiment is also a so-called surface magnet type permanent magnet synchronous motor. The electric motor according to the first embodiment rotates by the interaction between an alternating magnetic field generated by passing an alternating current through the exciting coil 37 of the stator 31 and the permanent magnet magnetic flux.

  Next, the flow of cooling air when the electric motor of the first embodiment is operated will be described with reference to FIGS. 5 and 6.

  FIG. 5 is a perspective view showing the air flow in the vicinity of the blower blade 41 generated when the rotor 30 rotates. FIG. 6 shows a cross section of the electric motor cut along AA in FIG. Here, FIG. 5 shows a state in which the stator 31 and the rotor 30 are arranged at an interval in the axial direction for the sake of convenience in order to facilitate understanding of the air flow.

  As shown in FIGS. 5 and 6, when the rotor 30 rotates and the blower blade 41 rotates, the air existing on the surface of the blower blade 41 is blown by the blower blade 41 to the outer peripheral side of the partial space where the blower blade 41 is located. Extruded. Thereby, an air flow AF <b> 1 is generated along the blower blade 41 from the inner peripheral side to the outer peripheral side of the blower blade 41. The air flow AF1 is continuous from the air flow AF0 taken from the opening 35A on the inner peripheral side of the end bracket 33.

  When the air pushed out in the radial direction reaches the outer peripheral side end of the blower blade 41, the air is peeled off from the blower blade 41 and becomes the air flow AF <b> 2 toward the inner peripheral side of the stator core back 38, that is, toward the radiation fins 36.

  Next, the flow of the air separated from the blower blade 41 will be described with reference to FIGS.

  FIG. 7 is a perspective view similar to FIG. 5, showing the flow of air peeled from the blower blade 41. Moreover, FIG. 8 shows the cross section of the electric motor cut | disconnected by AA in FIG. 7, similarly to FIG.

  As shown in FIGS. 7 and 8, the air flow AF <b> 2 separated from the blower blade 41 is generated by inertia force (centrifugal force about the rotation shaft 43), the stator core support portion 32 a and the shaft in the frame 32 of the stator 31. A spiral air flow AF3 that draws an arc from the inner peripheral side toward the outer peripheral side is formed in the space between the two.

  Next, the flow of air between the radiation fins 36 will be described with reference to FIGS. 9 and 10.

  FIG. 9 is a perspective view similar to FIGS. 5 and 7, showing the flow of air between the radiation fins 36. 10 shows a cross section of the electric motor cut along A-A in FIG. 9 as in FIGS.

  As shown in FIGS. 9 and 10, the spiral air flow AF3 shown in FIGS. 7 and 8 increases the pressure on the outer peripheral side of the space between the stator core support portion 32a and the shaft 20, as shown in FIGS. The air flow AF4 flows between the heat radiation fins 36 toward the end bracket 33. That is, the air flow AF4 is an air flow that is directed in the direction opposite to the direction from the blower blade 41 toward the connection portion between the frame 39 of the rotor 30 and the sheave 13 that is a mechanical load of the electric motor. This air flow AF4 absorbs the heat generated from the exciting coil 37 and the teeth 42 through the radiation fins 36 and then releases it into the atmosphere from the opening 35B that opens to the outer peripheral side of the end bracket 33 in the opposite direction. Is done. At this time, as described above, the air flow generated by the rotation of the blower blades 41 hardly flows into the space where the permanent magnet 40 and the stator core (34 in FIG. 4) are located. As a result, the stator core including the exciting coil 37 can be cooled without bringing the air flow into direct contact with the exciting coil 37 or the like.

  Therefore, according to the first embodiment, it is possible to improve the cooling performance of the rotating electrical machine without increasing the size of the rotating electrical machine and further preventing the performance deterioration or failure of the rotating electrical machine due to dust. In addition, this effect by the present Example 1 is acquired irrespective of the rotation direction of the rotor 30, ie, the raising / lowering direction of the elevator car 160 (FIG. 1), on the structure of the blower blade 41.

  The air flow AF4 may be brought into direct contact with the inner peripheral side of the stator core back 38, that is, the stator core support portion 32a, without providing the heat radiating fins 36. In this case, the air flow AF4 absorbs the heat generated from the exciting coil 37 and the teeth 42 through the stator core support portion 32a and then is released into the atmosphere. Similarly, the cooling performance of the rotating electrical machine is improved. can do.

  As described above, according to the first embodiment, the cooling performance can be improved without impairing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 11 and 12. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 11 is an external perspective view of the hoist according to the second embodiment. As in FIG. 5, a state is shown in which the stator 31 and the rotor 30 are arranged at an interval in the axial direction. Moreover, FIG. 12 shows the cross section cut | disconnected by AA in FIG.

  In the second embodiment, unlike the first embodiment, the end bracket 33 is not provided with openings (35A and 35B in FIG. 5). That is, the partial space in which the blower blades 41 are located is in a fully closed state on the side opposite to the side of the connection portion with the sheave 13 in the rotor 30. Therefore, in addition to the partial space where the stator core including the exciting coil 37 and the permanent magnet 40 are located in a substantially sealed state, the partial space where the blower blades 41 are located is also substantially sealed. This prevents dust contained in the air around the hoisting machine from entering the electric motor.

  As shown in FIGS. 11 and 12, in the second embodiment, when the blower blade 41 rotates with the rotation of the rotor 30, the space defined by the stator core support portion 32 a and the end bracket 33 and where the blower blade 41 is located. Inside, an air flow AF5 in the same direction as the rotation direction of the rotor 30 is generated. This air flow AF5 is in direct contact with the inner peripheral side of the stator core back 38, that is, the stator core support portion 32a and the radiation fin 36, and after absorbing heat generated from the excitation coil 37 and the teeth 42 via the radiation fin 36, The absorbed heat is transmitted to the end bracket 33. The heat transmitted to the end bracket 33 is released into the atmosphere outside the electric motor. Accordingly, the space in which the blower blades 41 are located is substantially sealed, and the cooling performance is improved while preventing dust from entering the motor.

  Furthermore, in the second embodiment, as shown in FIG. 12, the end bracket 33 has a direction from the blower blade 41 toward the connection portion between the frame 39 of the rotor 30 and the sheave 13 that is a mechanical load of the electric motor. In the opposite direction, that is, on the surface exposed in the partial space where the blower blades 41 are located, the radiation fins 46 are provided, and the radiation fins 46a are provided on the outer surface of the motor in contact with the atmosphere. As a result, the efficiency of heat exchange between the air flow AF5 and the surrounding atmosphere through the end bracket 33 is improved, so that the cooling performance of the motor is improved. Even if only one of the heat radiation fins 46 and 46a is provided, the cooling performance is improved.

  The configuration of the elevator to which the hoisting machine of the second embodiment is applied and the detailed appearance of the hoisting machine of the second embodiment are the same as those of the first embodiment (see FIGS. 1 and 2).

  As described above, according to the second embodiment, the cooling performance can be improved without impairing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Next, Embodiment 3 of the present invention will be described with reference to FIGS. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 13 is a perspective view illustrating an appearance and an axial cross-section of the hoist according to the third embodiment. As in FIG. 5, a state is shown in which the stator 31 and the rotor 30 are arranged at an interval in the axial direction. In FIG. 13, the air flows AF3 and AF4 shown in FIGS. 7 and 9 are shown together. FIG. 14 shows only an axial cross section in FIG.

  In the third embodiment, unlike the first embodiment, the connecting portion 47 of the rotor 30 with the sheave 13 in the frame 39 projects toward the stator core support portion 32a, and on the inner peripheral side of the stator core support portion 32a, the stator core support portion It overlaps with the free end on the opposite side to the connection end with the end bracket 33 in 32a. In a region where the connection portion 47 with the sheave 13 and the stator core support portion 32a overlap, a narrow gap is provided between the connection portion 47 with the sheave 13 and the stator core support portion 32a as long as the rotation of the rotor 30 is not hindered. . That is, a so-called labyrinth structure is formed between the partial space in which the blower blade 41 is located and the partial space in which the stator core and the permanent magnet 40 are located by the connection portion 47 between the rotor 30 and the sheave 13 and the end portion of the stator core support portion 32a. Is configured.

  In the third embodiment, as shown in FIG. 13 and in the same manner as in the first embodiment, when the blower blade 41 rotates, an arc is formed from the inner peripheral side toward the outer peripheral side in the partial space where the blower blade 41 is located. A spiral air flow AF3 is generated. The air flow AF3 has a velocity component that extends outward in the radial direction of the electric motor. However, since the pressure loss increases due to the labyrinth structure as described above, the air flows into the partial space where the stator core including the teeth 42 and the exciting coil 37 is located. Inflow is prevented. This prevents dust from adhering to the stator core and the permanent magnet.

  Furthermore, after the air flow AF3 reaches the connection portion 47 with the sheave 13 in the rotor 30, the pressure on the outer peripheral side of the space between the stator core support portion 32a and the shaft 20 increases, so that the air flow AF3 is connected from the blower blade 41. The air flow is directed in the direction opposite to the direction toward the portion 47, that is, the air flow AF4 flowing between the radiating fins 36 toward the end bracket 33. Therefore, according to the third embodiment, the cooling performance of the electric motor can be improved while preventing dust from adhering to the stator core and the permanent magnet 40 including the teeth 42 and the exciting coil 37.

  The configuration of the elevator to which the hoisting machine of the third embodiment is applied and the detailed appearance of the hoisting machine of the third embodiment are the same as those of the first embodiment (see FIGS. 1 and 2).

  As described above, according to the third embodiment, the cooling performance can be improved without impairing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. 15 and 16. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 15 is a perspective view illustrating an appearance and an axial cross section of the hoist according to the fourth embodiment. As in FIG. 5, a state is shown in which the stator 31 and the rotor 30 are arranged at an interval in the axial direction. 15 also shows the air flows AF3 and AF4 collectively as in FIG. FIG. 16 shows only an axial section in FIG.

  In the fourth embodiment, unlike the first embodiment, the inner diameter of the stator core support portion 32a is directed from the free end of the stator core support portion 32a toward the connection end with the end bracket 33, that is, from the blower blade 41 to the rotor 30 and the sheave. 13 increases in the direction opposite to the direction toward the connecting portion 47. That is, the inner peripheral surface of the stator core support portion 32 a has an inclination 51 that forms an acute angle on the end bracket 33 side with respect to the direction of the rotation shaft 43.

  In the fourth embodiment, as shown in FIG. 15 and in the same manner as in the first embodiment, when the blower blade 41 rotates, an arc is formed from the inner peripheral side to the outer peripheral side in the partial space where the blower blade 41 is located. A spiral air flow AF3 is generated. The air flow AF3 has a velocity component that goes outward in the radial direction of the electric motor. When the air flow AF3 reaches the inner circumferential surface of the stator core support portion 32a, this velocity component is provided on the inner circumferential surface of the stator core support portion 32a. It is converted into a velocity component along the inclination 51, and becomes an air flow AF4 flowing between the radiation fins 36 toward the end bracket 33. Thereby, the air flow AF3 can be guided toward the end bracket 33 without increasing the pressure on the outer peripheral side of the partial space where the blower blades 41 are located. Therefore, air is prevented from flowing into the partial space where the stator core including the teeth 42 and the exciting coil 37 and the permanent magnet 40 are located through the gap 44 between the rotor 30 and the stator 31.

  Therefore, according to the fourth embodiment, the cooling performance of the electric motor can be improved while preventing dust from adhering to the teeth 42 and the exciting coil 37.

In addition, as shown in FIG. 16, the contact part 48 of the ventilation blade 41 and the rotor 30 is closer to the end bracket 33 in the axial direction than the free end of the stator core support part 32a, that is, the start position 49 of the inclination 51 in the axial direction. It is preferable to be provided. In other words, the entire blades of the blower blades 41 are located within the projection of the inclination 51 from the inclination 51 toward the rotation axis along the radial direction. For this reason, the blades of the blower blades 41 are located between the partial space where the blower blades 41 are located and the partial space where the stator core 34 is located, and are adjacent to the inclination 51, the frame of the rotor 30 and the stator core support part of the stator 31. It does not overlap with the gap between 32a. Thus, the air flow AF3 is efficiently guided toward the end bracket 33.

  The configuration of the elevator to which the hoisting machine of the fourth embodiment is applied and the detailed appearance of the hoisting machine of the fourth embodiment are the same as those of the first embodiment (see FIGS. 1 and 2).

  As described above, according to the fourth embodiment, the cooling performance can be improved without reducing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Next, a fifth embodiment of the present invention will be described with reference to FIGS. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 17 is an external perspective view of the hoist according to the fifth embodiment. FIG. 17 shows a state where the stator 31 and the rotor 30 are assembled. FIG. 18 shows a cross section taken along line AA in FIG.

  In the fifth embodiment, unlike the first embodiment, a portion of the end bracket 33 facing the blower blade 41 and the heat radiating fin 36 is a circular opening. Accordingly, substantially the entire blower blade 41 and the radiating fin 36 are exposed to the outside of the motor. An annular end bracket portion 33a is connected to an end portion of the stator core support portion 32a opposite to the connection end with the end bracket 33. That is, the end bracket portion 33a serves as a partition plate that partitions between a partial space where the stator core including the teeth 42 and the exciting coil 37 and the permanent magnet 40 are located, and a partial space where the blower blades 41 are located. And the connection part of the ventilation blade 41 and the rotor 30 is rotatably supported by the end bracket part 33a via the bearing 50. FIG.

According to the above configuration, the blower blade 41 is located in the recessed space that is defined by the end bracket 33, the stator core support portion 32a, and the end bracket portion 33a and that opens toward the outside of the electric motor. Rotate. When the blower blade 41 rotates, as shown in FIG. 17, in the space where the blower blade 41 is located, a spiral air flow AF3 is generated that draws an arc from the inner peripheral side toward the outer peripheral side. When the pressure on the outer peripheral side of the recessed space in which the blower blade 41 is located is increased by the air flow AF3, the pressure is directed outward in the axial direction of the motor, that is, in the direction opposite to the direction from the blower blade 41 toward the end bracket portion 33a. Thus, an air flow AF6 flowing between the radiation fins 36 is generated. This air flow AF6 is in direct contact with the inner peripheral side of the stator core support portion 32a, absorbs heat generated by the exciting coil 37 and the teeth 42 via the heat radiation fin 36, and releases it to the atmosphere outside the motor. Thereby, the exciting coil 37 and the teeth 42 are cooled.

  In the fifth embodiment, as in the first embodiment, the stator core including the permanent magnet 40 and the exciting coil 37 is surrounded by the frame 32 in the stator 31, the end bracket 33 and the stator core support portion 32 a, and the frame 39 in the rotor 30. It is almost sealed in the partial space to be closed. Furthermore, in the fifth embodiment, the partial space where the permanent magnet 40 and the stator core are located and the recessed space where the blower blade 41 is located are partitioned by the end bracket portion 33a. Thereby, intrusion of dust into the space where the stator core and the permanent magnet 40 are located is prevented.

  As described above, according to the fifth embodiment, the cooling performance of the electric motor can be improved while preventing dust from adhering to the stator core including the teeth 42 and the exciting coil 37 and the permanent magnet 40.

  The configuration of the elevator to which the hoisting machine of the fifth embodiment is applied and the detailed appearance of the hoisting machine of the second embodiment are the same as those of the first embodiment (see FIGS. 1 and 2).

  As described above, according to the fifth embodiment, the cooling performance can be improved without impairing the reliability while reducing the size or thickness of the rotating electrical machine. This improves the reliability of the elevator hoist and the elevator.

  Next, Example 6 of the present invention will be described with reference to FIGS. 19 and 20. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 19 is an external perspective view of the hoist according to the sixth embodiment. FIG. 19 shows a state where the stator 31 and the rotor 30 are assembled. FIG. 20 shows a cross section taken along line AA in FIG.

  The sixth embodiment includes two motor units in the first embodiment, and the rotors 30 of the two motor units are directly connected via the sheave 13. That is, a tandem type motor is configured by two motor units in the first embodiment. The sheave 13 and the two rotors 30 are rotatably supported via the bearing 50 on the shaft 20 that is fixedly supported by the bearings 14A and 14B. Thereby, the hoisting torque can be increased.

  In the sixth embodiment, the rotation directions of the two blower blades 41 when viewed from the end bracket 33 side are opposite to each other. As described above with respect to the first embodiment, the operation / effect of the air blowing blade 41 does not depend on the rotation direction. Accordingly, as shown in FIG. 19, an air flow AF <b> 4 is generated in each electric motor portion as in the first embodiment, and the stator core of each electric motor portion is cooled.

  Therefore, according to the sixth embodiment, in the hoisting machine in which the sheave is driven by the tandem type motor unit, the cooling performance of the entire motor is prevented while preventing dust from adhering to the stator core and the permanent magnet of each motor unit. Can be improved. This improves the reliability of the elevator hoist and the elevator.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  For example, the elevator may be a machine room-less elevator in which a hoisting machine and a control device are installed in a hoistway. In addition, the blower blade is not limited to having a blade made of a flat plate member, but may have a radiator fan shape. Furthermore, the magnetic pole part of the rotor may be constituted by an electromagnet. The rotating electrical machine may be an inner rotor type, an embedded magnet type, or an axial gap type rotating electrical machine.

11: Base 12: Electric motor 13: Sheave 14A: Bearing base 14B: Bearing base 15: Braking device 16: Brake disc 17: Brake shoe 20: Shaft 21: Winding part 21a: Rope storage groove 22: Outer protrusion part 23 : Flange part 24: Fitting part 30: Rotor 31: Stator 32: Frame 32 a: Stator core support part 33: End bracket 33 a: End bracket part 34: Stator cores 35 A, 35 B: Opening part 36: Radiation fin 37: Excitation coil 38: Stator core back 39: magnetic pole part 40: permanent magnet 41: blower blade 42: teeth 43: rotating shafts 46, 46a: radiating fins 50: bearings 51: inclination 100: hoistway 110: machine room 120: hoisting machine 130: main rope 140: Warpage pulley 150: Counterweight 160: Cars AF1, AF2, AF , AF4, AF5, AF6: flow of air

Claims (10)

A stator core;
An exciting coil provided in the stator core;
A first support for supporting the stator core and the exciting coil;
A stator having
A magnetic pole,
A second support for supporting the magnetic pole part;
A rotor having
In the rotating electrical machine in which the stator and the rotor are arranged so that the stator core and the magnetic pole portion are opposed to each other through a gap,
In the space defined by the first support body and the second support body, the stator core and the exciting coil are arranged inside a partial space closed by the first support body and the second support body. Is located,
Located in the remaining partial space in the space, and located on the inner peripheral side of the stator core and the exciting coil, and having a plurality of blades, and provided with a blower blade that rotates as the rotor rotates ,
By the rotation of the blower blade, an air flow is generated in a direction opposite to the direction from the blower blade toward the load connecting portion of the rotor,
The rotating electrical machine according to claim 1, wherein the first support body has an inclined portion whose inner diameter increases in the opposite direction inside the remaining partial space . In the rotating electrical machine according to claim 1,
The rotary electric machine characterized in that the blades of the blower blades are flat. In the rotating electrical machine according to claim 1,
A rotating electrical machine, wherein the stator is provided with heat radiating fins located on an inner peripheral side of the stator core and located inside the remaining partial space. The rotating electrical machine according to any one of claims 1 to 3,
In the opposite direction, the first support body has an opening . The rotating electrical machine according to any one of claims 1 to 3 ,
The rotary electric machine characterized in that the first support and the second support constitute a labyrinth structure between the partial space and the remaining partial space . The rotating electrical machine according to any one of claims 1 to 3 ,
The blade of the blower blade does not overlap with a gap between the first support and the second support between the partial space and the remaining partial space. Rotating electric machine. The rotating electrical machine according to any one of claims 1 to 3 ,
In the opposite direction, the first support opens,
The rotary electric machine according to claim 1, wherein the first support body includes a partition plate that partitions the partial space and the remaining partial space on the load connection portion side . In a rotating electrical machine in which the rotors of two rotating electrical machines are directly connected to each other,
A rotating electrical machine, wherein the rotating electrical machine unit is the rotating electrical machine according to any one of claims 1 to 3 . A sheave around which the main rope for the elevator is wound,
A rotating electrical machine for rotating the sheave;
In an elevator hoisting machine comprising:
The hoisting machine for elevators, wherein the rotating electric machine part is composed of the rotating electric machine according to any one of claims 1 to 3. With a car and counterweight,
A main rope for suspending the car and the counterweight in the hoistway;
A hoist that drives the main rope;
In an elevator comprising
The hoisting machine
A sheave around which the main rope is wound;
A rotating electrical machine for rotating the sheave;
With
The said rotary electric machine part consists of a rotary electric machine as described in any one of Claims 1 thru | or 3. The elevator characterized by the above-mentioned.

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