JP6995564B2 - Abduction type rotary electric machine and elevator hoisting machine - Google Patents

Description

The present invention relates to an abduction type rotary electric machine and a hoist for an elevator.

In recent years, due to the need for miniaturization of elevator hoisting machines, a structure in which a mechanism (sheave, housing), a brake, and a rotary electric machine are integrated has become the mainstream. Therefore, the rotary electric machine is also required to be miniaturized (high torque density).

There is an abduction type rotary electric machine as one of the means for increasing the torque density of the rotary electric machine. In the abduction type rotary electric machine, the rotor is arranged on the outer peripheral side of the stator, and the radius of the gap between the rotor and the stator can be increased. Further, since the rotor is on the outside, the circumference of one pole becomes long and a large magnet can be arranged. Therefore, the abduction type rotary electric machine can have a higher torque density than the adduction type rotary electric machine.

However, since the coil, which is the main heat generating source of the rotary electric machine, is located on the inner diameter side, the space for arranging the coils is small, so that the heat dissipation area is also small and the temperature inside the rotary electric machine is high. Therefore, it is necessary to improve the cooling performance of the abduction type rotary electric machine in order to make it compact and lightweight.

As a measure for improving the cooling performance of the abduction type rotary electric machine, for example, there is a technique described in Patent Document 1. The abduction type rotary electric machine of Patent Document 1 is located on the inner peripheral side of the stator core, has a plurality of blades, and includes a blower blade that rotates with the rotation of the rotor. With this structure, the cooling performance is improved while maintaining the fully closed structure.

JP-A-2017-050908

In Patent Document 1, fins are provided on the inner peripheral side of the stator, but the method of attaching the fins is not mentioned.

For example, when fixing the fins with bolts or the like, it is necessary to machine a screw hole on the inner diameter side of the stator, but positioning is difficult because the inner diameter side of the stator has a cylindrical shape. In addition, large tools cannot be used due to space restrictions. Therefore, it is difficult to process the frame, the work man-hours increase, and the cost increases.

However, if the pressurization of the fins to the frame is insufficient, an air layer is formed between the fins and the frame, the thermal resistance increases, and sufficient cooling performance cannot be obtained.

An object of the present invention is to improve the cooling performance of an abduction type rotary electric machine without processing a frame.

The abduction type rotary electric machine according to one aspect of the present invention has a rotor connected to a rotating shaft via a rotor frame and formed by a rotor core and a permanent magnet arranged on the inner diameter side of the rotor core. , A stator having a coil in a plurality of slots provided in a stator core arranged on the inner diameter side of the rotor via a predetermined gap, and a stator frame connected to the stator. It is characterized by having fins provided on the inner diameter side of the stator frame and a pressing force applying mechanism for applying a force for pressing the fins in the direction of the stator frame.

The elevator hoist of one aspect of the present invention is characterized by having an abduction type rotary electric machine as a power for winding a rope connected to a car.

According to one aspect of the present invention, the cooling performance of the abduction type rotary electric machine can be improved without processing the frame.

It is external perspective view of the abduction type rotary electric machine of Example 1. FIG. It is a perspective view of the external axial sectional view of the abduction type rotary electric machine of Example 1. FIG. It is a perspective view of the appearance of the rotary electric machine part of the abduction type rotary electric machine of Example 1. FIG. It is an axial sectional view projected in 2D of the abduction type rotary electric machine of Example 1. FIG. It is a radial sectional view of a fin. It is a figure which shows the structure of the abduction type rotary electric machine of Example 2. It is a figure which shows the structure of the abduction type rotary electric machine of Example 3. It is a figure which shows the structure of the abduction type rotary electric machine of Example 4. It is a figure which shows the structure of the abduction type rotary electric machine of Example 5. It is a figure which shows the structure of the abduction type rotary electric machine of Example 6. It is a figure which shows the structure of the abduction type rotary electric machine of Example 7. It is sectional drawing in the axial direction of the elevator hoist of Example 8. FIG.

The abduction type rotary electric machine of the embodiment has a rotor formed by a rotor core and a permanent magnet arranged on the inner diameter side of the rotor core connected via a rotation shaft and a rotor frame, and an inner diameter of the rotor. A stator having a coil in a plurality of slots provided in a stator core arranged via a predetermined gap on the side, a stator frame connected to the stator, and an inner diameter side of the stator frame. It has a fin provided in the above and a pressing force applying mechanism for applying a force for pressing the fin in the direction of the stator frame.

Here, the pressing force applying mechanism is, for example, a mechanism having a spring fixed to the end face of the stator frame, and the fins are pressed in the direction of the stator frame by the repulsive force or the compressive force of the spring (the following implementation). See Example 1).

Alternatively, the pressing force applying mechanism has, for example, a support member that supports the fins, a fixing member that is provided on the end face of the stator frame and fixes the support member, and a connecting screw that connects the support member and the fixing member. It is a mechanism (see Example 3 below).

However, as the pressing force applying mechanism, a mechanism other than the above mechanism may be adopted as long as it is a mechanism capable of applying a force for pressing the fins in the direction of the stator frame.

Hereinafter, examples will be described with reference to the drawings.

The configuration of the abduction type rotary electric machine of the first embodiment will be described with reference to FIGS. 1A to 1D.
Here, FIG. 1A is a perspective view of the appearance. FIG. 1B is a perspective view of an axial sectional view of the appearance. FIG. 1C is a perspective view of the appearance of the rotary electric machine unit. FIG. 1D is an axial sectional view projected in two dimensions. In FIG. 1D, rotating components are shown by diagonal lines.

As shown in FIGS. 1A to 1D, the abduction type rotary electric machine 1 of the first embodiment has a predetermined gap between the rotor 4 composed of the rotor core 2 and the permanent magnet 3 and the inner diameter side of the rotor 4. A stator 8 provided and arranged and composed of a stator core 6 and a coil 7, a rotary shaft 24 provided at the center of rotation, a rotor frame 9 for connecting the rotor 4 and the rotary shaft 24, and a stator. The stator frame 11 is configured to connect the rotor 8 and the rotary shaft 24 via the bearing 10 and cover the rotor 4 and the stator 8.

Here, it is desirable that the coil 7 is attached to the stator core by centralized winding. As a result, the length of the short portion in the axial direction of the coil 7 is shortened, and the axial length of the abduction type rotary electric machine 1 is shortened, so that the size can be reduced. Further, the bearing 10 is arranged on one side 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, it is desirable that the abduction type rotary electric machine 1 has a fully closed structure in which external air is not taken into the abduction type rotary electric machine 1. This prevents dust, dust, iron powder, etc. from entering the inside of the abduction type rotary electric machine 1 and improves maintainability. Even if there is a slight amount of air coming in and out through the gaps in the frame, there is little effect and there is no problem.

Although the auxiliary bearing 12 that supports the rotating shaft 23 is used in addition to the bearing 10, the auxiliary bearing 12 may not be used and may be arranged on the axial center side of the stator 8 from the bearing 10.

Fins 13 are provided on the inner diameter side of the stator frame 11. The contact surface of the fin 13 with the stator frame 11 has substantially the same shape as the inner diameter of the fixing frame 11.
The fin 13 is fixed to the stator frame 11 while being pressed by the pressing force 16 due to the repulsive force of the spring 14. With such a structure, the degree of adhesion between the fin 13 and the stator frame 11 is increased. Therefore, the heat transfer coefficient of the fin 13 and the stator frame 11 becomes high, the heat generated by the abduction type rotary electric machine 1 can be effectively dissipated to the outside, and the temperature rise can be reduced.

It is desirable that the spring 14 is fixed to the end face (side surface) of the stator frame 11. Since the end surface of the stator frame 11 is easier to process than the inner diameter surface of the stator frame 11, the spring can be fixed by a screw or the like.

When the bolt hole of the through bolt for fixing the stator core 6 and the stator frame 11 is provided on the end face of the stator frame 11, this bolt hole may be diverted to the fixing of the spring 14. As a result, it is not necessary to provide a bolt hole dedicated to fixing the spring, and the man-hours can be reduced and the cost can be reduced.

Further, the spring fixing jig 15 may be provided on the stator frame 11, and the spring 14 may be provided on the spring fixing jig 15. As a result, the spring 13 can be fixed more firmly and safety can be improved.

FIG. 2 shows a radial cross-sectional view of the fin 13.
As shown in FIG. 2, a pressing force 16 is applied to both ends of the fin 13 by the spring 14. As a result, the fins 13 can be fixed at two points, so that stable installation is possible. However, the number of springs 13 may be one as long as it can be installed sufficiently stably, and it can be installed more stably by setting the number of springs 13 to three or more.

Since the fin 13 can be fixed on the surface, it is preferable to form the spring 14 with a leaf spring. However, if the fin 13 can be sufficiently pressurized and fixed, the same effect can be obtained by using another type of spring. Further, although the fin 13 is fixed by using the repulsive force of the spring, the same effect can be obtained by the shape of fixing by using the elastic force of the spring. Further, the number of fins 13 is not limited as long as the required cooling performance can be obtained.

The configuration of the abduction type rotary electric machine 1 of the second embodiment will be described with reference to FIG.
In the first embodiment, the fin 13 was directly fixed by the spring 14, but as shown in FIG. 3, the fin fixing jig 17 is provided on the fin 13 and the fin fixing jig 17 is fixed by the spring 14. May be. With this structure, the fins 13 can be fixed in a wide area, so that more stable fixing is possible. The spring 14 may be installed on the stator frame 11 via the spring fixing jig 18.

The configuration of the abduction type rotary electric machine 1 of the third embodiment will be described with reference to FIG.
In Examples 1 and 2, a structure for fixing the fin 13 using a spring is shown, but in Example 3, a structure for fixing the fin 13 with a screw is shown.

As shown in FIG. 4, the mounting jig 19 is arranged on the stator frame 11, and the mounting jig 20 is arranged on the fin 13. Here, the mounting jig 20 has a longer shape on the mounting jig 19 side in the axial direction than the fin 13. The mounting jig 19 is arranged radially outside the mounting jig 20. Here, by fixing the mounting jig 19 and the mounting jig 20 with the screws 21, the fins 13 can be fixed while being pressed against the stator frame 11.

The fin 13 and the mounting jig 19 may be fixed by the screw 21, but it is desirable that the fin 13 is pressed against the stator frame 11 by a plurality of set screws 22. By adjusting the tightening torque of each set screw 22, the dimensional tolerance of the stator frame 11 can be corrected. Further, the air layer between the fin 13 and the stator frame 11 can be reduced, and the heat transfer coefficient can be improved.

The configuration of the abduction type rotary electric machine 1 of the fourth embodiment will be described with reference to FIG.
As shown in FIG. 5, the fin 13 may be divided into a fin portion 23 having a flat bottom surface and a pedestal portion 25 having a portion having substantially the same shape as the inner diameter of the stator frame 11. With this structure, commercially available fins can be used for the fin portion 23, so that the cost can be reduced. The fin portion 23 and the pedestal 25 may be detachably fixed with screws or the like.

The configuration of the abduction type rotary electric machine 1 of the fifth embodiment will be described with reference to FIG.
As shown in FIG. 6, a flexible substance 26 having good thermal conductivity, such as heat transfer grease or a heat radiating sheet, may be arranged between the fin 13 and the stator frame 11.

As a result, it is possible to prevent the formation of an air layer between the fin 13 and the stator frame 11, so that the heat transfer coefficient can be improved and the cooling performance can be improved.

Similarly, the heat transfer coefficient can be improved by arranging the heat transfer grease or the heat dissipation sheet between the fin portion 23 and the pedestal 25 shown in the fourth embodiment (see FIG. 5).

The configuration of the abduction type rotary electric machine 1 of the sixth embodiment will be described with reference to FIG. 7.
As shown in FIG. 7, the fin 27 may be inclined so that the side opposite to the end surface (side surface) of the stator frame 11 is thicker.

Since the fin 13 is fixed from the end face side of the stator frame 11, it is difficult for a force to be transmitted to the opposite side, and an air layer may be formed between the fin 13 and the stator frame 11. Therefore, by adopting the structure shown in FIG. 7, a force is easily applied to the side opposite to the end surface of the stator frame 11, so that the generation of an air layer can be prevented.

The configuration of the abduction type rotary electric machine 1 of the seventh embodiment will be described with reference to FIG.
As shown in FIG. 8, a partition portion 32 for dividing the space on the inner diameter side of the stator frame 11 is provided on the inner diameter side of the fin 13, and a fan 28 is provided on the inner diameter side thereof. By creating an air flow in the space on the inner diameter side of the stator frame 11, the fan 28 makes it possible to apply cooling air to the fins 13. As a result, the cooling performance can be improved.

The fan 28 may be a self-excited fan directly connected to the rotating shaft 24 or an separately-excited fan driven by another power source. Further, the shape of the fan 28 may be a propeller-shaped axial fan or a radial fan that discharges wind in the radial direction. Furthermore, it may be a spitting fan or a sucking fan.

FIG. 9 shows Example 8 in which the abduction type rotary electric machine 1 of Example 1 is applied to an elevator hoist.
The elevator hoist of the eighth embodiment has the abduction type rotary electric machine 1 of the first embodiment as a power for winding the rope connected to the car.

As shown in FIG. 7, a sheave 30 for winding an elevator hoisting rope 29 and a brake 31 for mechanically stopping the rotation are attached to the abduction type rotary electric machine 1.

According to the eighth embodiment, since the abduction type rotary electric machine which has been miniaturized by improving the cooling performance is used, the weight of the elevator hoist can be reduced and the installation cost can be reduced.

1 Abduction type rotary electric machine 2 Rotor core 3 Magnet 4 Rotor,
6 Stator core 7 Coil 8 Stator 9 Rotor frame 10 Bearing 11 Stator frame 12 Auxiliary bearing 24 Rotating shaft 13 Fin 14 Spring 15 Spring fixing jig 18 Spring fixing jig 16 Pushing force,
17 Fin fixing jig,
19 Mounting jig 20 Mounting jig 21 Screw 22 Set screw 23 Fin part 25 Pedestal part 26 Heat dissipation sheet,
27 Fin 32 Partition 28 Fan 29 Rope 30 Sheave 31 Brake

Claims (10)

A rotor connected to the rotating shaft via a rotor frame and formed by a rotor core and a permanent magnet arranged on the inner diameter side of the rotor core.
A stator having a coil in a plurality of slots provided in a stator core arranged on the inner diameter side of the rotor via a predetermined gap, and a stator.
The stator frame connected to the stator and
The fins provided on the inner diameter side of the stator frame and
A pressing force applying mechanism for applying a force for pressing the fins in the direction of the stator frame, and a pressing force applying mechanism.
Have,
The pressing force applying mechanism has a spring fixed to the end face of the stator frame.
The pressing force applying mechanism further includes a support member for fixing the fins.
The fin is fixed in contact with the support member, and is fixed.
The support member is fixed by the spring and is fixed.
An abduction type rotary electric machine characterized in that the fins are pressed in the direction of the stator frame together with the support member by the repulsive force or the compressive force of the spring . The abduction type rotary electric machine according to claim 1, wherein the fin has a contact surface with the stator frame having substantially the same shape as the inner diameter of the stator frame. The abduction type rotary electric machine according to claim 1, wherein the spring is formed of a leaf spring. The abduction type rotary electric machine according to claim 1, further comprising a substance having a heat transfer coefficient higher than that of air provided between the stator frame and the fins. The abduction type rotary electric machine according to claim 1, wherein the fin has an inclined portion such that the opposite side of the end face of the stator frame becomes thick. The fins
The pedestal portion that comes into contact with the stator frame and
Detachable fins on the pedestal and
The abduction type rotary electric machine according to claim 1. The abduction type rotary electric machine according to claim 6 , wherein a substance having a heat transfer coefficient higher than that of air is provided between the pedestal portion and the fin portion. A partition portion provided on the inner diameter side of the fin, the space on the inner diameter side of the stator is divided into two layers in the radial direction, and the space divided into the two layers is connected on the axial bearing side.
A fan is further provided on the inner diameter side of the partition portion.
The abduction type rotary electric machine according to claim 1, wherein the air inside the stator is discharged to the outside by the fan. An elevator hoist having the abduction type rotary electric machine according to claim 1 as a power for winding a rope connected to a car. The elevator hoist according to claim 9 , wherein the abduction type rotary electric machine is provided with a sheave for winding a rope and a brake for mechanically stopping the rotation.

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