JP6694804B2 - Abduction type rotating electric machine - Google Patents

Description

  The present invention relates to an outer rotation type electric rotating machine, and more particularly to a rotating electric machine suitable for constituting an elevator hoisting machine that needs to be compact and lightweight.

  In recent years, a structure in which a mechanism (sheave, housing), a brake, and a rotating electric machine are integrated has become mainstream due to a need for downsizing of an elevator hoisting machine.

  Therefore, miniaturization (higher torque density) is also required for rotating electric machines. An outer rotating electric machine is known as one of means for increasing the torque density of the rotating electric machine. In the outer rotation type rotating electric machine, the rotor is arranged on the outer peripheral side of the stator, the radius of the rotor-stator gap (gap) can be increased, and since the rotor is on the outer side, one pole Has a feature that the circumference is increased and a large magnet can be arranged, and it is possible to increase the torque density of the adder type rotary electric machine.

  However, since the coil, which is the main heat source of the rotating electrical machine, is located on the inner diameter side, the space for disposing the coil is reduced, so that the heat radiation area is also reduced and the temperature inside the rotating electrical machine is increased. Therefore, for a small and lightweight rotating electric machine, it is necessary to improve the cooling performance of the outer rotation type rotating electric machine.

  As a measure for improving the cooling performance of the outer rotation type rotary electric machine, for example, there is a technique described in Patent Document 1. In Patent Document 1, a sheave rotatably attached to a fixed shaft via a bearing, a rotor that rotates integrally with the sheave, and a rotor provided inside the rotor so as to face the rotor. In an outer rotor type hoisting machine having a stator winding and a stator composed of a stator core, a plurality of heat radiation fins for conducting and dissipating heat generated by the stator are provided on the inner peripheral side of the stator. I am configuring. With this configuration, since the heat radiation area on the inner diameter side of the rotor can be increased, the cooling performance can be improved.

JP, 2005-104620, A

  In Patent Document 1, the radiator fin is provided on the inner diameter of the stator, but the space on the inner diameter side of the stator is surrounded by the structure except in one direction, which makes it difficult to circulate air. Therefore, the temperature of the air around the radiation fins becomes high, and the fin performance as expected may not be obtained. Further, Patent Document 1 also describes a structure in which a ventilation hole is formed in the frame and a separately excited fan is used to apply air to the fins. However, if a hole is made in the frame, the strength may decrease and dust such as dust may enter the motor. Further, in order to use the separately excited fan, it is necessary to prepare a power source, which complicates the configuration.

  The present invention has been made in view of the above points, and an object thereof is an outer rotation type that has a simple structure and can improve the cooling performance of an outer rotation type rotary electric machine, which enables weight reduction and space saving. An object is to provide a hoisting machine for a rotating electric machine or an elevator.

  One aspect of the present invention is a rotating shaft that rotates about a rotation center axis, a rotor frame that is connected to the rotation shaft, a rotor that is connected to the rotor frame and rotates about the rotation center axis, A stator arranged on the inner diameter side of the rotor with a predetermined gap between the rotor, a stator frame connected to the stator, and a stator frame, which is provided on the inner diameter side of the stator frame. In addition, the outer rotating electric machine includes a heat radiation fin and a cooling fan connected to the rotating shaft and provided on the inner diameter side of the heat radiation fin.

  In order to solve the above-mentioned problems, another aspect of the present invention is to provide a rotating shaft, a rotating shaft and a rotor frame, and a rotor core and a permanent magnet arranged on an inner diameter side of the rotor core. Connected to the stator, a rotor formed by the above, a stator provided with coils in a plurality of slots provided in a stator core arranged on the inner diameter side of the rotor with a predetermined gap, and And a stator frame, wherein the rotary shaft and the stator frame are connected via a bearing, the outer rotation type rotary electric machine, wherein a fin is provided on the inner diameter of the stator frame, and the inner diameter side of the fin and the stator frame A fan directly connected to the rotary shaft is provided on the inner side in the axial direction.

  By improving the cooling performance, it becomes possible to provide a small and light outer rotation type electric rotating machine or an elevator hoisting machine.

1 is an axial sectional view showing an outline of an outer rotation type rotary electric machine according to a first embodiment of the outer rotation type rotary electric machine of the present invention. FIG. It is a perspective sectional view showing an example of a cooling fan and a radiation fin. It is an axial sectional view of an outer rotation type rotary electric machine according to the second embodiment of the present invention. It is a radial schematic diagram of a stator frame and a fin regarding Example 3 of this invention. It is a radial direction schematic diagram of a stator frame and a fin regarding Example 4 of this invention. It is a radial direction schematic diagram of a stator frame and a fin regarding Example 4 of this invention. It is a radial direction schematic diagram of a stator frame and a fin regarding Example 4 of this invention. 1 is an axial cross-sectional view of an elevator hoisting machine that employs an outer rotating electric machine that is an embodiment of the present invention.

  Hereinafter, the outer rotation type electric rotating machine and the elevator hoisting machine of the present invention will be described based on the illustrated embodiments. Hereinafter, in each of the embodiments, the contents related to the structure for improving the cooling performance of the outer rotation type rotary electric machine will be described. In each embodiment, the same components will be described using the same reference numerals, and redundant description may be omitted. In addition, although the basic configuration is the same, some modified components may be described only by adding the same reference numerals to the subscripts. Further, when the description is focused on the basic configuration, the suffix may be omitted in the description. The following is merely an example and does not intend to limit the embodiments of the present invention to the following specific embodiments.

  The position, size, shape, range, etc. of each component shown in the drawings and the like may not represent the actual position, size, shape, range, etc. in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings and the like.

  First Embodiment FIG. 1 shows an axial sectional view of a first embodiment of an outer rotation type rotary electric machine of the present invention. Although FIG. 1 is a cross-sectional view, in order to facilitate understanding of the configuration, rotating components are shown with black dots, and non-rotating (fixed) components are shown in outline.

  The outer-rotating electric machine 1 of the present embodiment is arranged with a rotor 4 composed of a rotor core 2 and a permanent magnet 3, a predetermined gap on the inner diameter side of the rotor 4, and a stator core 6. The stator 8 configured by the coil 7, the rotating shaft 24 that rotates about the rotation center shaft 100, the rotor frame 9 that connects the rotor 4 and the rotating shaft 24, the stator 8 and the rotating shaft 24 A stator frame 11 that is connected via a bearing 10 and is configured to cover the rotor 4 and the stator 8 is provided.

  As is clear from FIG. 1, in this embodiment, the rotor 4 rotates about the rotation center axis 100. In this specification, for convenience, the direction of the rotation center axis 100 is referred to as an “axial direction”, and the direction perpendicular to the axial direction is referred to as a “radial direction” or a “radial direction”. Further, in the radial direction, the direction approaching the rotation center axis 100 is referred to as “inner diameter side” or “inner side”, and the direction away from it is referred to as “outer diameter side” or “outer side”.

  Here, the coil 7 is preferably attached to the stator core 6 by concentrated winding. As a result, the length of the axial short portion of the coil 7 is shortened, the axial length of the outer rotation type rotary electric machine 1 is shortened, and the size can be reduced. Further, the bearing 10 is arranged at a position displaced with respect to the axial center of the stator 8 and is configured to provide a space on the inner diameter side of the stator frame 11. Further, in FIG. 1, an auxiliary bearing 12 that supports the rotating shaft 24 is used in addition to the bearing 10, but the auxiliary bearing 12 may be omitted. Alternatively, the auxiliary bearing 12 may be arranged closer to the axial center side of the stator 8 than the bearing 10. The sizes and materials of these components may be the same as those of the conventional technique described in Patent Document 1, for example. For example, the rotor frame 9 and the stator frame 11 are made of cast iron.

  In this embodiment, the heat radiating fins 13 are provided on the inner diameter of the stator frame 11, and the cooling fan 14 directly connected to the rotating shaft 24 by the fan central shaft 25 is provided on the inner diameter side. The radiating fin 13 has, for example, a plate-like structure, the plate surface is arranged perpendicularly to the inner wall of the stator frame 11, and the plate has a long side in the long axis direction (that is, the axial direction) of the rotating shaft 24. Since the surface area of the inner diameter of the stator frame 11 is increased by the heat radiation fins 13, the amount of heat generated in the coil 7, the stator core 6 and the like can be efficiently released to the outside of the abduction type rotary electric machine 1 and the cooling performance can be improved. ..

  Further, by disposing the cooling fan 14 on the inner diameter side of the radiating fins 13, the cooling fan 14 agitates the air with the rotation of the rotating shaft 24 and allows the air to flow like the cooling air 15, thereby circulating the air. Can be made For this reason, the air temperature around the radiation fin 13 can be reduced, and the radiation efficiency of the radiation fin 13 can be improved. The cooling fan 14 has, for example, a plate-like structure, the plate surface is arranged radially with respect to the rotation center axis 100, and has the long side of the plate in the long axis direction (that is, the axial direction) of the rotation shaft 24. As shown in FIG. 1, the cooling fan 14 is fixed to the rotating shaft 24 together with the rotor 4, and does not require a dedicated power for the cooling fan 14 in order to rotate around the rotation center axis 100.

  Here, the cooling fan 14 is preferably a radial fan capable of radiating air in the radial direction. If an axial fan that discharges air in the axial direction is used, it is necessary to provide ventilation holes in the stator frame 11 and / or the rotor frame 9 or both in order to form the flow path, which leads to a decrease in strength and dust. There is a possibility that problems such as dust and the like entering the inside of the abduction type rotary electric machine may occur. By ejecting air in the direction perpendicular to the rotating shaft 24, the ejected air collides with the inner wall of the stator frame 11 and the heat radiation fins 13, and moves in the direction along the inner wall of the stator frame 11, thereby improving efficiency. Ventilation becomes possible. Further, it is desirable that the cooling fan 14 and the fan central shaft 25 have a structure that can be removed from the rotary shaft 24. For example, the rotary shaft 24 and the fan central shaft 25 can be connected by a screw structure or the like. As a result, the cooling fan 14 can be attached after the outer rotation type rotary electric machine 1 is assembled, which facilitates manufacturing and leads to cost reduction.

  FIG. 2 is a perspective view of the radiation fin 13 and the cooling fan 14 of FIG. 1 as viewed obliquely from the direction of arrow 200 in FIG. In order to show the internal structure, a state in which the fan center axis 25 is divided into two parts is shown. The cooling fan 14 is configured as a radial fan, and blows air from the fan central shaft 25 toward the radiating fins 13.

  FIG. 3 is a sectional view showing the second embodiment. In the first embodiment, the radiating fin 13 is attached to be substantially parallel to the rotation center axis 100. However, as shown in FIG. 3, the radiation fins 13A arranged obliquely may be used so that the radius becomes larger as the distance from the rotation shaft 24 increases in the axial direction. That is, the closer to the opening 300 side, the larger the distance between the radiation fin 13A and the rotation center axis 100. As a result, the radiating fins 13A serve as a flow path guide for the air discharged from the cooling fan 14, so that the air easily flows and the heat radiation efficiency of the radiating fins 13A can be improved.

  In the configuration of FIG. 3, the stator frame 11A to which the heat radiation fins 13A are attached has a large taper shape on the side of the opening 300. Therefore, the flow of air blown to the inner wall of the stator frame 11A by the cooling fan 14, which is a radial fan, is guided to the opening 500 side of the stator frame 11A, and the structure enables efficient ventilation. There is.

  FIG. 4 shows a frame structure according to the third embodiment. It is a figure corresponding to the situation which looked at the rotation center axis | shaft 100 of FIG. 1 from the arrow 200 side, and has shown a part of stator frame 11 and the radiation fin 13. As shown in FIG.

  As shown in FIG. 4, the radiating fins 13B may be integrally formed with the stator frame 11B. For example, the heat radiation fin 13B is integrally cast as a part of the stator frame 11B, and the stator frame 11B and the heat radiation fin 13B are both made of cast iron. As a result, the thermal resistance between the stator frame 11B and the radiation fins 13B is reduced, so that the cooling performance can be improved.

  In FIG. 4, the radiation fins 13B are oriented vertically upward and arranged in parallel, but they may be formed radially toward the center of rotation so that the fin spacing becomes narrower toward the inner diameter, and vice versa. You may form so that the fin space | interval may widen as it goes. Further, although nine fins are provided at equal intervals, the number of fins is not specified, and they may be provided at unequal intervals. Although nine fins are provided at one location in FIG. 4, any number of fins may be provided on the entire inner circumference of the stator frame 11.

  FIG. 5 shows a frame structure according to the fourth embodiment. Although the stator frame 11B in which the fins are integrally formed is used in the third embodiment, the heat sink 13C having a plurality of fins may be attached to the stator frame 11C as shown in FIG. As a result, the stator frame 11C can be easily manufactured, and the cost can be reduced. That is, when the stator frame 11C is cast, the structure of the mold is simple and manufacturing is easy.

  FIG. 6 shows a frame structure which is another example. As shown in FIG. 6, a stator frame 11D having a flat inner surface may be used. As a result, the heat sink 13D that is generally commercially available can be attached, and the cost can be further reduced.

  FIG. 7 shows another method of providing a flat surface on the inner diameter of the frame. As shown in FIG. 7, a rotor frame 13E having a groove with a flat bottom on the inner diameter may be used.

  Although the number of heat sinks (fins) is one in FIGS. 4 to 7, it may be two or more as in FIG. 2, and the intervals between the heat sinks may be equal or unequal. Also, a plurality of heat sinks may be arranged in the axial direction.

  As shown in FIGS. 5 to 7, in the embodiment in which the heat sink and the heat radiation fin 13 are formed separately from the stator frame 11, and joined, the heat sink and the heat radiation fin 13 are formed from a different material from the stator frame 11. You can For example, the radiation fin 13 can be made of aluminum or copper. Further, the radiation fin 13 can be formed into a shape that is difficult to mold by integral casting. It is desirable that the heat sink and the radiating fins 13 are closely attached to the stator frame 11 in order to improve heat conduction. Therefore, it is desirable to form the joint surface to be smooth. As a joining method, for example, screwing or the like can be performed.

  FIG. 8 shows a fifth embodiment in which the outer rotation type rotating electric machine of the present invention is applied to an elevator hoisting machine.

  As shown in FIG. 8, a sheave 802 around which a rope 801 for an elevator hoisting machine (the drawing shows a rope cross section) is wound around the outer rotation type rotary electric machine 1 shown in FIG. 1 and rotation is mechanically performed. A brake 803 for braking is attached. The brake shoe included in the brake 803 can perform braking by frictional force by sandwiching a part of the rotor frame 9.

  According to this example, since the outer rotation type rotary electric machine 1 that is downsized by improving the cooling performance described above is used, it is possible to reduce the weight of the elevator hoisting machine and reduce the installation cost. Can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Rotating electric machine, 2 ... Rotor core, 3 ... Permanent magnet, 4 ... Rotor, 6 ... Stator core, 7 ... Coil, 8 ... Stator, 9 ... Rotor frame, 10 ... Bearing, 11 ... Stator Frame, 12 ... Auxiliary bearing, 24 ... Rotating shaft, 25 ... Fan central shaft, 13 ... Radiating fins, 14 ... Cooling fan, 15 ... Cooling air, 100 ... Rotating central shaft, 801 ... Rope, 802 ... Sheave, 803 ... Brake ..

Claims (8)

A rotation axis that rotates around the rotation center axis,
A rotor frame connected to the rotating shaft;
A rotor that is connected to the rotor frame and rotates about the rotation center axis;
On the inner diameter side of the rotor, a stator arranged with the rotor and a predetermined gap,
A stator frame connected to the stator;
A radiation fin connected to the stator frame and provided on the inner diameter side of the stator frame,
A cooling fan that is connected to the rotating shaft and is provided on the inner diameter side of the heat radiation fins and that is a radial fan that radially discharges air;
Equipped with
The stator frame has a substantially cylindrical cylindrical member that surrounds the rotation center axis, and is connected to the rotation shaft via a bearing,
The cylindrical member is a cylindrical portion of the stator frame on which the heat radiation fins are provided,
And, the cylindrical member is arranged so as to be axially displaced from the rotating shaft,
Inside the cylindrical member, the heat radiation fins are provided,
A fan center axis, which is the center of rotation of the cooling fan, is attached to the rotating shaft, and the fan center axis is arranged on the inner diameter side of the cylindrical member,
The cylindrical member has a taper structure in which one end farther from the bearing is opened to form an opening, and the diameter of the opening side is increased in at least a part of the cylindrical member,
The outer-rotating electric machine according to claim 1, wherein the heat radiation fins are installed in the tapered structure portion and are arranged so as to be distant from the cooling fan on a side close to the opening. The outer rotation type rotating electric machine according to claim 1,
An abduction-type rotating electric machine, wherein the stator frame and the heat radiation fins are integrally formed. The outer rotation type rotating electric machine according to claim 1,
An outer-rotating electric machine according to claim 1, wherein a heat sink composed of a plurality of the radiation fins is attached to the stator frame. The outer rotation type electric rotating machine according to claim 3,
An abduction-type rotating electric machine, wherein a flat surface for mounting the heat sink is provided on an inner diameter of the stator frame. The outer rotation type electric rotating machine according to claim 4,
An outer rotation type rotating electric machine, wherein a groove having the flat surface as a bottom surface is provided in an inner diameter of the stator frame. The outer rotation type rotating electric machine according to claim 1,
An outer rotation type rotary electric machine comprising: a sheave connected to the rotor frame and rotating around the rotation center axis to wind a rope. The outer rotation type electric rotating machine according to claim 6,
An outer rotation type electric rotating machine comprising a brake for braking the rotor frame. The outer rotation type rotating electric machine according to claim 1,
The rotor is formed by a rotor core and a permanent magnet arranged on the inner diameter side of the rotor core,
The stator is formed by a stator core arranged on the inner diameter side of the rotor via a predetermined gap, and a coil arranged in the stator core,
An outer rotation type rotating electric machine, wherein the rotating shaft and the stator frame are connected via a bearing.

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