JP2020129891A - Rotary electric machine and hoist system using the same for elevator - Google Patents

Abstract

To provide a rotary electric machine in which deterioration in the cooling performance thereof can be suppressed and furthermore contact between a stator and a rotor is prevented.SOLUTION: A rotary electric machine 100 is constituted of a rotor 1, and a stator 2 arranged oppositely to the rotor in a radial direction at a prescribed space. The rotor has a rotor iron core 3, and a plurality of permanent magnets 5 are arranged on an outer peripheral side of the rotor iron core while changing polarity. The stator has a stator iron core 4 and a stator coil 6, a teeth 10 and a slot 11 in which a stator coil is arranged are alternately formed in the peripheral direction of the stator iron core. A wedge 12 for preventing the stator coil from dropping to inner diameter side is provided at each of the inner diameter side of the slot. A part of the wedge arranged in each inner diameter side of the slot is projected to the inside from each inner diameter surface of the teeth to be thereby formed as a wedge projection 8a, and the wedge projections are arranged at a plurality of positions in an axial direction and a peripheral direction of the stator iron core.SELECTED DRAWING: Figure 1

Description

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

Induction motors have been used as rotating electrical machines for elevators, but in recent years, permanent magnet type motors have become possible that are smaller, lighter, and more efficient due to the cost reduction of permanent magnets and the spread of high-performance inverters. Motivation to adopt a rotating electric machine is increasing.

Elevators, like cars and trains, are required to have good riding comfort because people board them. Torque ripple generated from the rotating electric machine is a factor that deteriorates the riding comfort. Further, also in the case of an elevator system, particularly in the case of a high-speed, large-mass type system, since the rotating electric machine and the gear are connected, torque ripple reduces the reliability of the gear.

In order to reduce torque ripple, a rotor structure of a rotating electric machine employs a surface magnet type rotor structure in which permanent magnets are arranged on the surface of a rotor core.

Since the rotating speed of the rotating electric machine itself is on the order of several hundreds of min ⁻¹ because it is connected to a gear, the rotating electric machine has a relatively low rotating speed.

Since the output of the rotating electric machine is the product of the angular velocity and the torque, in the case of the rotating electric machine of low rotation speed, a large torque is required to obtain the same output with respect to the rotating electric machine of high rotation speed. In this case, the rotor has a large diameter to generate torque. It is more difficult to assemble a surface magnet type rotor having a larger diameter than a small rotating electric machine. In particular, when the surface magnet type rotor has a large diameter, the amount of magnets increases and the magnetic attraction force increases, so when inserting the rotor into the stator, the magnetic attraction force of the rotor makes contact with the stator. And the assembling of the surface magnet type rotor becomes difficult.

The magnetic attraction force of the rotor increases the possibility of contact with the stator, which causes damage or deformation of the rotor, and thus requires protection of the rotor.

A common rotor protection method is a structure in which the outer surface of the rotor is covered with a metal tube, resin, carbon fiber or the like. Although this protection method has an effective structure for protecting the rotor, it poses a problem of increase in manufacturing man-hours and cost.

On the other hand, a structure for protecting the rotor on the side of the stator has also been studied, for example, Patent Document 1.

In Patent Document 1, an electrically insulating member having thermal conductivity is projected in both axial directions from the stator core of the stator winding in a state where the stator winding is mounted in the slot of the stator core. When filling the coil end portion and molding the coil end portion with the electric insulating member, the electric insulating member is filled on the inner peripheral surface side of the stator core, and the electric insulating member is used to fill the inside of the stator core. It is described that the peripheral surface side is molded.

JP, 2005-328689, A

Patent Document 1 discloses a structure for facilitating filling of an electrically insulating member in order to fix a coil arranged on a stator. In the case of the structure of Patent Document 1, the electric insulating member is filled, and therefore, it is molded with resin or the like. However, the electric insulating member is filled along the inner peripheral surface of the stator, and from the viewpoint of protecting the rotor, the inner peripheral surface of the stator is reduced. It is advantageous to cover the entire circumference.

However, in the case of the structure of Patent Document 1, since the resin is molded, the gap area between the rotor and the stator is narrowed. Further, since the use of the electric insulating member is considered to have a small electromagnetic effect, it is disadvantageous for the rotating electric machine in which the cooling method is ventilation cooling.

Further, when cooling the rotating electric machine by ventilation cooling, an effective cooling means is to flow a large amount of refrigerant in the gap portion between the rotor and the stator. The structure in which the circumference is covered with the electrically insulating member reduces the ventilation area. That is, it means that the ventilation resistance is increased and the refrigerant is hard to flow.

As described above, when the permanent magnet is applied to reduce the size of the rotating electric machine, the heat generation density is increased at the same time. It can be said that the reduction in cooling performance is fatal in order to be established as a rotary electric machine. Also, when filling and covering the inner circumference of the stator with resin such as a mold, it is necessary to fill in a dedicated jig and in a vacuum to prevent holes, so large equipment is required for filling in a vacuum. Manufacturing man-hours and costs will be excessive.

For this reason, it is necessary to reduce the manufacturing man-hours and costs, and to prevent the rotor and the stator from coming into contact with each other while suppressing the deterioration of the cooling performance of the rotating electric machine.

The present invention has been made in view of the above points, and an object thereof is to prevent contact between the rotor and the stator while suppressing reduction in cooling performance as well as reduction in manufacturing man-hours and cost. (EN) Provided is a rotating electric machine capable of performing the above and an elevator hoisting system using the same.

In order to achieve the above object, the rotating electrical machine of the present invention comprises a rotor and a stator that is arranged to face the rotor with a predetermined gap in the radial direction, and the rotor has a rotor core. , A plurality of permanent magnets are arranged on the outer peripheral side of the rotor core while changing the polarity in the circumferential direction, the stator has a stator core and a stator coil, and teeth are provided in the circumferential direction of the stator core. And a slot in which the stator coil is arranged are alternately formed, and a wedge is provided on each inner diameter side of the slot to prevent the stator coil from falling off to the inner diameter side. And a part of the wedge arranged on the inner diameter side of each of the slots is formed so as to protrude inward from the inner diameter surface of the tooth, and the protrusion of the wedge is formed in the axial direction of the stator core. And a plurality of locations are arranged in the circumferential direction.

Further, in order to achieve the above object, the elevator hoisting system of the present invention is an elevator hoisting system including a hoisting machine having a sheave and a rotating electric machine connected to the sheave, The electric machine is a rotating electric machine having the above configuration.

According to the present invention, it is possible to prevent contact between the rotor and the stator while suppressing a decrease in cooling performance as well as reducing manufacturing man-hours and costs.

It is a 1/8 sectional view which shows the rotor and stator in Example 1 of the rotary electric machine of this invention. FIG. 2 is a sectional view taken along the line AA′ of FIG. 1. It is an axial sectional view showing the schematic structure of Example 1 of the rotary electric machine of the present invention. FIG. 5 is a characteristic diagram showing a relationship between the number of protrusion wedges arranged in the circumferential direction and the refrigerant flow rate in the first embodiment of the rotating electric machine of the present invention. It is an axial direction partial sectional view showing a schematic structure of Example 2 of a rotary electric machine of the present invention. It is explanatory drawing which shows the relationship of the shape of a protrusion wedge and refrigerant|coolant flow rate in Example 2 of the rotary electric machine of invention. It is a fragmentary sectional view showing the stator in Example 3 of the rotary electric machine of the present invention. It is explanatory drawing which shows the relationship between the material of the protrusion wedge and impact strength in Example 4 of the rotary electric machine of this invention. It is a partial cross section figure which shows the stator in Example 5 of the rotary electric machine of this invention. It is a partial cross section figure which shows the stator in Example 6 of the rotary electric machine of this invention. It is sectional drawing which shows schematic structure of an example of the elevator hoisting machine system as Example 7 of this invention. It is sectional drawing which shows schematic structure of the other example of the elevator winding machine system as Example 7 of this invention.

Hereinafter, a rotating electric machine of the present invention and an elevator hoisting system using the same will be described based on the illustrated embodiments. In each embodiment, the same reference numerals are used for the same components.

Example 1 of the rotary electric machine of this invention is shown in FIG.1 and FIG.2. 1 is a 1/8 sectional view showing a rotor and a stator in a rotating electric machine according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view taken along the line AA′ in FIG. The rotary electric machine 100 of the present embodiment shown in FIG. 2 is a rotary electric machine mainly used for elevator hoisting machines, and has an output of several hundred kW and a rotational speed of several hundred min ⁻¹ class. Applied for high speed and heavy loads.

As shown in FIGS. 1 and 2, a rotary electric machine 100 of the present embodiment includes a rotor 1 and a stator 2 that is arranged to face the rotor 1 with a predetermined gap (gap 7) in the radial direction. The rotor 1 has a rotor core 3, and a plurality of permanent magnets 5 are arranged on the outer peripheral side of the rotor core 3 while changing the polarities in the circumferential direction, while the stator 2 has a stator core 4 and A stator coil 6 is provided, and teeth 10 and slots 11 in which the stator coils 6 are arranged are alternately formed in the circumferential direction of the stator core 4, and the stator is provided on the inner diameter side of each slot 11. A wedge 12 is provided to prevent the coil 6 from falling off toward the inner diameter side.

Specifically, the permanent magnet 5 is arranged outside the rotor core 3 and constitutes a surface magnet type rotor. 1 and 2 show the state in which the rotor 1 is arranged on the stator 2, but when actually assembling, the rotor 1 is inserted into the stator 2 from the axial direction. At this time, since the rotor 1 has the magnetized permanent magnet 5 incorporated therein, magnetic attraction force is generated by the magnetic flux generated from the permanent magnet 5.

That is, unless the rotor 1 is inserted into the stator 2 and fixed by the bearing 9 (see FIG. 3) or the like, there is a high possibility that the rotor 1 will come into contact with the magnetic material due to the influence of the magnetic attraction force. It can be said that the rotor 1 and the stator 2 are most likely to come into contact with each other during the insertion work of the rotor 1.

In particular, as described in the above-mentioned [Background Art], the rotor 1 of this embodiment is also large in size, so that the deformation and damage of the rotor 1 when the rotor 1 and the stator 2 come into contact with each other are large. Become.

Therefore, in this embodiment, a part of the wedge 12 arranged on the inner diameter side of the slot 11 is used as a protruding wedge 8a that is protruded inward from the inner diameter surface of the tooth 10 as shown in FIG. A plurality of wedges 8a are arranged in the axial direction and the circumferential direction of the stator core 4 (in this embodiment, two locations in the axial direction and three locations in the circumferential direction), and a non-magnetic material is applied to the projecting wedge 8a. doing.

With this configuration, it is possible to prevent contact between the rotor 1 and the stator 2 (strictly speaking, the inner diameter side tips of the teeth 10).

In the first place, the purpose of disposing the wedge 12 is to prevent the stator coil 6 housed in the slot 11 from falling off toward the inner diameter side. That is, it is a component necessary for establishing the stator 2 regardless of whether or not the rotor 1 is in contact.

From this, even if the protruding wedge 8a is formed by protruding a part of the wedge 12 toward the inner diameter side, there is almost no influence on the manufacturing process, man-hours and cost. Therefore, the rotor 1 can be easily protected.

By the way, in FIG. 1, only one protruding wedge 8a is shown, and the wedges 12 arranged in the other slots 11 are normal wedges 12. Although FIG. 1 has a 1/8 cross section in consideration of the symmetry of the rotor 1 and the stator 2, the protruding wedge 8a in the present embodiment is not limited to the symmetry.

That is, since the projection wedge 8a is intended to prevent the rotor 1 and the stator 2 from coming into contact with each other, the minimum necessary number of circumferentially arranged protrusions 8a may be three. The ideal positions of the protruding wedges 8a arranged in the circumferential direction are 120° pitch. Of course, the number of the protruding wedges 8a to be provided may be three or more depending on the shape of the rotor 1 and the like.

Next, the position where the axial protruding wedge 8a is provided will be described with reference to FIG.

As described above, since the projecting wedge 8a is intended to prevent the rotor 1 and the stator 2 from coming into contact with each other, the minimum necessary number of axially arranged elements may be two. The ideal positions for arranging the protruding wedges 8a are both axial ends of the stator 2. Of course, the number of the protruding wedges 8a provided in the axial direction may be two or more in consideration of the bending and the shape of the rotor 1.

Next, the relationship with the cooling performance in the configuration of this embodiment will be described with reference to FIG. FIG. 3 shows an axial sectional view of the rotary electric machine 100 of the first embodiment.

As shown in FIG. 3, the stator 2 is fixed to the frame 13, and a fan 14 is arranged at the axial end of the frame 13. In the fan 14, the refrigerant 15 flows in the axial direction of the gap 7 between the rotor 1 and the stator 2, passes through the refrigerant outlet 16 and is released to the atmosphere.

Here, the relationship between the number of circumferentially arranged protruding wedges 8a and the refrigerant flow rate in this embodiment will be described with reference to FIG.

FIG. 4 is a characteristic diagram showing the relationship between the number of circumferentially arranged protruding portions of the protruding wedges 8a and the refrigerant flow rate in the rotary electric machine 100 of the present embodiment.

In FIG. 4, the refrigerant flow rate when only the wedge 12 without the protruding wedge 8a is standardized to 1.0. Further, the protruding length of the protruding wedge 8a on the radially inner side is unified with 1/2 of the width of the gap 7.

As shown in FIG. 4, it can be seen that the coolant flow rate decreases as the number of the protruding wedges 8a arranged increases. Further, when the number of protrusion wedges 8a arranged in the circumferential direction is three (120° pitch), it can be said that there is almost no decrease in cooling performance because the decrease in air flow is slight.

On the other hand, when the protruding wedges 8a are arranged in half the number of slots (every other slot), the refrigerant flow rate is reduced by about 15%, and when the entire circumference is covered as in Patent Document 1, it is about half.

For this reason, the cooling performance decreases as the number of the protruding wedges 8a arranged increases. Therefore, in order to prevent the contact between the rotor 1 and the stator 2 and maintain the cooling performance, it is ideal that the minimum number of the protruding wedges 8a is three, as described above.

Although the cooling structure of the rotating electric machine 100 of the present embodiment is an open type structure in which the fan 14 discharges the refrigerant 15 to the outside of the rotating electric machine 100, the fan 14 is provided inside the rotating electric machine 100 and the refrigerant 15 also rotates. The same cooling performance can be obtained even in the rotating electric machine having a fully closed structure that circulates in the electric machine 100.

Therefore, according to this embodiment, it is possible to prevent contact between the rotor 1 and the stator 2 and maintain the cooling performance regardless of the cooling structure. Further, in FIG. 3 showing the refrigerant flow rate and the number of circumferentially arranged protruding wedges 8a, as described above, the protruding length of the protruding wedge 8a on the radially inner diameter side is 1/2 of the width of the gap 7. It is easier to avoid contact between the rotor 1 and the stator 2 if the protrusion length is substantially equal to the width of the gap 7.

However, prevention of contact between the rotor 1 and the stator 2 is easier to avoid, but there is a possibility of contact during rotation due to bending when the rotor 1 rotates, so an appropriate protrusion amount should be used. Is preferred. For example, if the amount of flexure of the rotor 1 is 10% or less of the width of the gap 7, as shown in FIG. 3, the protruding length of the protruding wedge 8a on the radially inner side is Lr, and the width of the gap 7 is g. Then, the protrusion length Lr of the protruding portion of the protruding wedge 8a on the radially inner side is smaller than the width g of the gap 7 between the stator 2 and the rotor 1, specifically, the protruding direction of the protruding wedge 8a in the radial direction. The protrusion length Lr on the inner diameter side should be Lr<g×0.9. That is, it is necessary to set the protrusion length Lr of the protrusion wedge 8a on the radially inner side in consideration of the bending amount of the rotor 1.

Although the rotating electrical machine 100 shown in this embodiment has 56 poles and 72 slots, the effects of the present invention can be obtained with other poles and slots. Further, the winding method of the stator coil 6 is concentrated winding, but there is no problem with other winding methods.

According to the present embodiment described above, it is possible to prevent the rotor 1 and the stator 2 from coming into contact with each other while suppressing the reduction of cooling performance as well as the reduction of manufacturing man-hours and costs.

Example 2 of Example 2 of the rotary electric machine 100 of this invention is shown in FIG.

As shown in FIG. 5, in the rotary electric machine 100 of the present embodiment, the shape of the protruding wedge 8b on the end surface of the stator 2 into which the refrigerant 15 flows is determined from the axial end of the protruding wedge 8b to the axial center (see FIG. 5). The protruding wedge 8b is formed so as to gradually increase in the right direction), that is, the end portion in the axial direction is thinnest, and the protruding wedge 8b gradually increases toward the center in the axial direction. This means that, from a different point of view, the protruding wedge 8b is formed in a triangular shape that gradually becomes thinner from the outer diameter side toward the inner diameter side (from top to bottom in FIG. 5). Other configurations are similar to those of the first embodiment.

As shown by the arrow in FIG. 5, the projecting wedge 8b serves as an inflow port for the refrigerant 15 to flow into the gap 7, so that the flow rate of the refrigerant 15 flowing into the gap 7 is greatly affected.

FIG. 6 shows the relationship between the refrigerant flow rates depending on the shape of the protruding wedge 8b shown in FIG.

“None” shown in FIG. 6 indicates a shape in which the protruding wedge 8b has no gradually increasing portion that gradually increases from the axial end portion toward the axial center, and the flow rate at that time is standardized to 1.0. Further, as shown in FIG. 6, it is understood that the air volume is increased by about 1.3 times by providing the projecting wedge 8b with the gradually increasing portion that gradually increases from the axial end portion toward the axial center.

This is because the loss of the inflow surface of the fluid largely changes depending on the shape, and the projecting wedge 8b is formed with a gradually increasing portion that gradually increases from the axial end portion toward the axial center, thereby reducing the loss.

It can be said that by adopting the shape of the projecting wedge 8b of the present embodiment, the difference from the refrigerant flow rate when the projecting wedge 8a shown in FIG. 4 is not applied is further reduced.

Therefore, by applying the shape of the protruding wedge 8b of the present embodiment, it is possible to prevent contact between the rotor 1 and the stator 2 and further maintain cooling performance.

FIG. 7 shows a rotating electric machine 100 according to a third embodiment of the present invention.

As shown in FIG. 7, in this embodiment, the projecting wedge 8a is divided into two in the radial direction, the inner diameter side is the non-magnetic material projecting wedge 8a, and the outer diameter side is the magnetic wedge 17. Other configurations are similar to those of the first embodiment.

As in the present embodiment, the projecting wedge 8a is divided into two in the radial direction and the outer diameter side is made the magnetic wedge 17, so that the influence of the slot ripple can be reduced. Since the influence of the slot ripple is mainly related to the torque ripple and the loss, if the influence of the slot ripple is reduced, the performance of the rotary electric machine 100 will be improved.

With this embodiment, the same effects as those of the first embodiment can be obtained, and the torque ripple and the loss can be reduced, so that the performance of the rotary electric machine 100 can be improved.

FIG. 8 shows the impact strength of the material of the protruding wedge 8a in the fourth embodiment of the rotary electric machine 100 of the present invention in comparison.

In the above-described first embodiment, it has been described that the protruding wedge 8a is premised on the non-magnetic material in order to prevent the contact between the rotor 1 and the stator 2.

However, examples of the non-magnetic material include metals (aluminum, copper), resin, plastic, etc. The purpose of the protruding wedge 8a is, as described above, the contact between the rotor 1 and the stator 2 and the stator coil 6. It is a fallout prevention. That is, the output, efficiency, etc., which are the main performances of the rotary electric machine 100, have nothing to do with it.

Further, if it is limited to the protruding portion of the protruding wedge 8a, it is not always necessary to maintain the shape shown in the embodiment 1-3. That is, the protrusions of the protruding wedge 8a may come into contact with the rotor 1 to be deformed or damaged (from the viewpoint of output and efficiency, which are main performances of the rotating electric machine 100, the rotor 1 may be deformed or damaged). Rather than damage, the protrusions of the protruding wedges 8a may come into contact with the rotor 1 to be deformed or damaged).

Here, the surface of the rotor 1 is generally mostly metal. In this case, it can be said that it is better to apply a non-magnetic material, which is softer than metal and brittle, to the projection of the projection wedge 8a for the reason described above. That is, it can be said that the hardness of the protruding portion of the protruding wedge 8a is preferably softer than the hardness of the surface of the rotor 1.

From this, as shown in FIG. 8, when the surface of the rotor 1 is made of iron, if the protruding portion of the protruding wedge 8a is made of resin, the impact strength becomes about 5% of that of iron. It is possible to prevent the deformation and damage of No. 1.

Therefore, it is preferable that the material of the protruding portion of the protruding wedge 8a is a non-magnetic and soft material than the material of the surface of the rotor 1.

Example 5 of the rotary electric machine 100 of this invention is shown in FIG.

As shown in FIG. 9, in this embodiment, the circumferential width of the projecting portion of the projecting wedge 8c is larger than the circumferential width of the slot 11. Other configurations are similar to those of the first embodiment.

With such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained, and even if the number of the protruding wedges 8 is small, the contact between the rotor 1 and the stator 2 is prevented. It will be easier.

Further, if the rotor 1 and the protruding wedge 8c contact each other, since the circumferential width of the protruding portion is wide as in the present embodiment, the contact surface with the rotor 1 is also wide, and thus the rotor 1 and the protruding portion 8c are protruded. Even if the wedges 8c come into contact with each other, concentrated stress is less likely to occur, so that the possibility of deformation or damage of the rotor 1 can be reduced.

FIG. 10 shows Embodiment 6 of the rotating electric machine 100 of the present invention.

As shown in FIG. 10, in the present embodiment, the circumferential width w of the protruding portion of the protruding wedge 8d is shorter than the radial length g of the gap 7.

According to the configuration of this embodiment, even if the protruding wedge 8d is damaged and falls off, if the circumferential width w of the protruding portion of the protruding wedge 8d is shorter than the radial length g of the gap 7, It is possible to prevent the fragments of the protrusion 8d from being caught between the rotor 1 and the stator 2.

In particular, even if the protruding wedge 8d is damaged while the rotor 1 is rotating and the fragment remains on the inner diameter side of the stator 2, the rotor 1 can rotate without interference.

Therefore, by applying the present embodiment, it is possible to obtain the same effect as that of the first embodiment and, of course, increase the reliability of the rotary electric machine 100.

[Embodiment 7] Fig. 11 shows a hoisting system for a levitator as Embodiment 7 of the present invention.

As shown in FIG. 11, in the hoisting system for a elevator of the present embodiment, any one of the rotary electric machines 100 described in the first to sixth embodiments is directly connected to the sheave 22 via a coupling 23. It is designed to be driven.

FIG. 12 shows an example in which any one of the rotary electric machines 100 described in the first to sixth embodiments is directly connected to the sheave 22 via the coupling 23.

As shown in FIG. 12, the bearing 9 on the direct coupling side of the rotary electric machine 100 is eliminated and the rotary electric machine 100 is directly coupled to the sheave 22. That is, the structure is such that one side of the rotating electric machine 100 is supported by the sheave 22.

By doing so, the axial length of the elevator system for elevators can be reduced. Further, since the bearing 9 can be eliminated, the effect of reducing the number of parts of the rotary electric machine 100 can be obtained.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, 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/replace other configurations with respect to a part of the configurations of the respective embodiments.

1... Rotor, 2... Stator, 3... Rotor core, 4... Stator core, 5... Permanent magnet, 6... Stator coil, 7... Gap, 8a, 8b, 8c, 8d... Projection wedge, 9... Bearing, 10... Teeth, 11... Slot, 12... Wedge, 13... Frame, 14... Fan, 16... Refrigerant, 16... Refrigerant outlet, 17... Magnetic wedge, 22... Sieve, 23... Coupling, 100... Rotating electric machine.

Claims (15)

A rotor and a stator arranged to face the rotor with a predetermined gap in the radial direction,
The rotor has a rotor core, the outer peripheral side of the rotor core, a plurality of permanent magnets are arranged while changing the polarity in the circumferential direction,
The stator has a stator core and a stator coil, and teeth and slots in which the stator coil is arranged are alternately formed in the circumferential direction of the stator core, and the inner diameter side of each of the slots is formed. Is a rotary electric machine provided with a wedge for preventing the stator coil from falling off toward the inner diameter side,
A part of the wedge arranged on the inner diameter side of each of the slots is formed so as to protrude inward from the inner diameter surface of the tooth, and the protruding portion of the wedge has an axial direction and a circumferential direction of the stator core. A rotating electric machine, characterized in that a plurality of locations are provided in each. The rotating electric machine according to claim 1,
The rotary electric machine is characterized in that the protrusions of the wedge are formed in two or more locations in the axial direction and three or more locations in the circumferential direction. The rotating electric machine according to claim 2,
The rotary electric machine according to claim 1, wherein the protrusions of the wedges formed at three locations in the circumferential direction are arranged at a pitch of 120° in the circumferential direction. The rotating electric machine according to claim 2 or 3, wherein
A rotary electric machine, wherein the protrusions of the wedge formed at two locations in the axial direction are arranged at both ends in the axial direction. The rotary electric machine according to any one of claims 1 to 4,
The rotary electric machine according to claim 1, wherein the protrusion of the wedge has a circumferential width larger than a circumferential width of a slot of the stator. The rotary electric machine according to any one of claims 1 to 4,
The rotating electrical machine according to claim 1, wherein the protrusion of the wedge has a circumferential width smaller than a radial width of the gap. The rotary electric machine according to any one of claims 1 to 4,
The rotary electric machine is characterized in that the protruding portion of the wedge is divided into two in the radial direction, the wedge on the inner diameter side divided into two is made of a nonmagnetic material, and the wedge on the outer diameter side is made of a magnetic material. The rotary electric machine according to any one of claims 1 to 6,
The rotating electric machine, wherein the wedge is made of a non-magnetic material. The rotating electric machine according to claim 8,
The rotating electric machine, wherein the non-magnetic material is metal, resin, or plastic. The rotating electric machine according to claim 9,
The hardness of the protrusion of the wedge is softer than the hardness of the surface of the rotor. The rotating electric machine according to claim 4,
The rotating electrical machine according to claim 1, wherein the protruding portion of the wedge is formed so as to gradually increase from an axial end portion of the protruding portion of the wedge toward an axial center. The rotary electric machine according to claim 11,
The rotating electrical machine according to claim 1, wherein the protruding portion of the wedge is formed in a triangular shape that becomes thinner gradually from the outer diameter side toward the inner diameter side. The rotary electric machine according to any one of claims 1 to 12,
A rotary electric machine, wherein a protrusion length of the protrusion of the wedge on the inner diameter side in the radial direction is smaller than a gap width between the stator and the rotor. The rotary electric machine according to claim 13,
When the protrusion length of the protruding portion of the wedge on the radially inner side is Lr and the gap width between the stator and the rotor is g, the protrusion length Lr is Lr<g×0.9. A rotating electric machine characterized by. A hoisting system for elevators, comprising a hoisting machine having a sheave and a rotating electric machine connected to the sheave,
An elevator hoisting machine system, wherein the rotating electric machine is the rotating electric machine according to any one of claims 1 to 14.

Images