WO2021234994A1

WO2021234994A1 - Outer rotor-type rotating electric machine

Info

Publication number: WO2021234994A1
Application number: PCT/JP2020/048317
Authority: WO
Inventors: 勇介浅海; 暁史高橋; 博洋床井; 努三好; 亮平税所; 海洋于
Original assignee: 株式会社日立産機システム
Priority date: 2020-05-22
Filing date: 2020-12-23
Publication date: 2021-11-25
Also published as: JP2021184674A

Abstract

This outer rotor-type rotating electric machine has a stator having a plurality of slots and coils wound around the slots, a rotor rotatably held in the radial direction of the stator with a predetermined gap interposed between the rotor and the stator, a stator frame for holding the stator, a rotor frame for holding the rotor, and an end plate fixed to an end of the rotor in the axial length direction, wherein: an opening portion is formed between the rotor frame and the stator frame; and a gap connected to the opening portion is formed between the stator frame and the end plate.

Description

Abduction type rotary electric machine

The present invention relates to a rotary electric machine, and particularly to an abduction type rotary electric machine.

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. In addition, the abduction type rotary electric machine has a feature that the circumference of one pole is long because the rotor is on the outside and a large magnet can be placed, which makes it possible to increase the torque density compared to the adduction type rotary electric machine. Become.

Patent Document 1 is known as an abduction type rotary electric machine. In the small-diameter motor for a multicopter described in Patent Document 1, the rotor is composed of a cup-shaped rotor core and a magnet attached to the inside thereof. Further, Patent Document 1 describes that a gap structure is formed between a cover member and a plate or a fixed support, and the cover member is excellent in waterproof and dustproof performance.

JP-A-2018-129893

As an example of a large diameter motor, there is a large diameter motor for elevators. Large-diameter motors for elevators have a structure in which core shapes are punched out from electrical steel sheets and laminated in the axial length direction. As a result, iron loss is reduced, and the motor is designed to have high output and high efficiency. In this configuration, unevenness may occur on the outer peripheral surface of the rotor core due to an error when punching the electromagnetic steel sheet or a deviation in the outer peripheral direction when the electromagnetic steel sheets are laminated, and the size of the outer diameter of the rotor core is large. The accuracy of is low.

When the gap structure of Patent Document 1 is applied to a large-diameter motor for an elevator or the like, the accuracy of the outer diameter of the rotor core is low, so it is necessary to make the gap a large width in consideration of tolerances, which is sufficient. It is not possible to prevent the ingress of dust and water droplets. Further, in Patent Document 1, the cover member is fixed in the radial direction with respect to the rotor. In such a configuration, strain occurs in the rotors stacked in the axial length direction, and it is difficult to accurately adjust the width of the gap between the cover member and the plate or the fixed support.

For large-diameter motors for elevators, it is desirable to eliminate the dedicated machine room and install it in the hoistway from the viewpoint of improving the degree of freedom in building layout. Due to its structure, the hoistway is not airtight and dust and dirt have entered. Dust or dust entering the sliding surface of the motor or the like causes a failure. Therefore, from the viewpoint of improving reliability and reducing the maintenance burden, the elevator motor installed in the hoistway is required to have a configuration in which dust and water droplets do not enter.

Therefore, it is necessary to cover the outer peripheral side of the rotor with a stator frame to prevent dust and water droplets from entering. However, if the rotor is covered with the stator frame in the axial length direction, the heat generated by the magnet, the coil, and the core is difficult to dissipate, and the temperature inside the rotating electric machine becomes high. As a result, the magnet temperature and the coil temperature rise, leading to a decrease in the efficiency of the rotary electric machine. Therefore, high cooling performance is also required in order to lower the temperature inside the rotary electric machine.

An object of the present invention is to provide an abduction type rotary electric machine which prevents dust and water droplets from entering and has improved cooling performance.

As a preferred example of the present invention, a stator having a plurality of slots and a coil wound around the slots, and a stator that can rotate in the radial direction of the stator through a predetermined gap with respect to the stator. It has a rotor held in, a stator frame holding the stator, a rotor frame holding the rotor, and an end plate fixed to the end of the rotor in the axial length direction. This is an abduction type rotary electric machine in which an opening is formed between the rotor frame and the stator frame, and a gap connected to the opening is formed between the stator frame and the end plate.

According to the present invention, it is possible to realize an abduction type rotary electric machine that prevents dust and water droplets from entering and has improved cooling performance.

It is a figure which shows the radial direction of the central part of the abduction type rotary electric machine. It is a perspective view which shows the assembly process in the comparative example. It is a perspective view which shows after assembling in the comparative example. It is a figure which shows the perspective view of the stator frame in the comparative example. It is a figure which shows the perspective view seen from the direction opposite to FIG. 1D. It is a figure which shows the axial length direction in the comparative example. It is a figure which shows the enlarged view of the part A of FIG. 1F. It is a figure which shows the axial length direction of the abduction type rotary electric machine of Example 1. FIG. It is an enlarged view of the B part of FIG. 2A. It is a figure which shows the axial length direction of the abduction type rotary electric machine in Example 2. FIG. It is an enlarged view of the part C of FIG. 3A. It is a figure which shows the axial length direction of the abduction type rotary electric machine in Example 4. FIG. It is an enlarged view of the D part of FIG. 4A. It is a figure which shows the axial length direction of the abduction type rotary electric machine in Example 5. It is an enlarged view of the E part of FIG. 5A. It is a perspective view of the abduction type rotary electric machine in the middle of assembling of Example 6. It is a perspective view of the abduction type rotary electric machine after the assembly of Example 6. FIG. 5 is a perspective view of an abduction type rotary electric machine during assembly of the seventh embodiment. It is a perspective view of the abduction type rotary electric machine after the assembly of Example 7. FIG. It is a perspective view of the abduction type rotary electric machine in the middle of assembling of Example 8. It is a perspective view of the abduction type rotary electric machine after the assembly of Example 8. FIG. It is a figure which shows the radial direction in the central part of the abduction type rotary electric machine of Example 8.

In the process of examining the performance improvement of the abduction type rotary machine for elevators, the inventor found and solved various problems by starting the examination from the following comparative example. Prior to explaining the embodiments of the present invention, first, a comparative example will be described.

FIG. 1A is a diagram showing the radial direction of the central portion of the abduction type rotary electric machine 100. In FIG. 1A, the rotor frame 8 and the stator frame 9 are omitted. The radial direction is the direction indicated by R.

The abduction type rotary electric machine 100 is composed of a rotor 3 composed of a rotor core 1 and a permanent magnet 2, a stator core 4 and a coil 5 arranged with a predetermined gap on the inner diameter side of the rotor 3. The stator 6 is provided.

The rotor 3 is rotatably arranged with the rotation axis 90 as the central axis. It is desirable that the coil 5 is attached to the stator core 4 by centralized winding. As a result, the length of the coil 5 to the end in the axial length direction is shortened, and the length of the abduction type rotary electric machine 100 in the axial length direction is shortened, so that the size can be reduced.

Further, it is desirable that the portion (slot) in which the coil 5 of the stator core 4 is arranged is an open slot. This facilitates the insertion of the coil 5 and improves the assembleability. Further, it is desirable that the vicinity of the gap (tip of the tooth) of the stator core 4 has a curvature smaller than the radius. As a result, the rate of change in the magnetoresistance in the circumferential direction can be reduced, and torque ripple can be reduced.

FIG. 1B is a perspective view showing the middle of assembly in the comparative example. FIG. 1C is a perspective view showing after assembly in the comparative example.

FIG. 1D is a diagram showing a perspective view of a stator frame 9, which is a component constituting the abduction type rotary electric machine 100 in the comparative example.

FIG. 1E is a diagram showing a perspective view seen from a direction opposite to that of FIG. 1D.

The stator frame 9 has an inner cylindrical portion 9a and an outer cylindrical portion 9b having different sizes, an inner disc portion 9c that closes one side end portion of the inner cylindrical portion 9a, and an end portion in a direction opposite to the inner disc portion 9c. It is composed of an outer disk portion 9d connecting the inner cylindrical portion 9a and the outer cylindrical portion 9b.

Further, a step 9e is provided between the inner cylindrical portion 9a and the outer disc portion 9d so that the stator 6 can be positioned in the axial length direction. The length of the outer cylindrical portion 9b in the axial length direction is longer than the length in the axial length direction of the rotor core 1, and the stator frame 9 covers the rotor core 1. As shown in FIG. 1C, the rotor 3 and the stator 6 have a fully closed structure housed inside the rotor frame 8 and the stator frame 9. As a result, the rotor 3 and the stator 6 cannot be directly blown by air for air cooling.

FIG. 1F is a diagram showing the axial length direction of the abduction type rotary electric machine 100 as a comparative example. Further, FIG. 1G shows an enlarged view of part A of FIG. 1F.

As shown in FIG. 1G, the stator frame 9 has a structure that covers the rotor core 1 except for the gap 11a formed between the rotor frame 8 and the outer cylindrical portion 9b of the stator frame. With such a configuration, the rotor core 1 and the stator frame 9 have a thin air layer 10 shown by diagonal lines. In this air layer 10, it is difficult for air to circulate and the thermoelectric conductivity of air is small, which hinders heat dissipation by the heat dissipation path 12 shown by the arrow in FIG. 1F, and is a factor of deterioration of heat dissipation in the structure of the comparative example. It has become.

In the structure in which the stator frame 9 covers the rotor core 1, a narrow gap 11a is provided between the rotor frame 8 and the stator frame 9, and this width is controlled to prevent dust and water droplets from entering. Required to construct a closed structure.

FIG. 2A is a diagram showing the axial length direction of the abduction type rotary electric machine 100 of the first embodiment. The diagram showing the radial direction of the central portion of the abduction type rotary electric machine 100 is as shown in FIG. 1A for any of Examples 1 to 7.

In the abduction type rotary electric machine 100 of the first embodiment, as shown in FIGS. 1A and 1B, the stator 6 has a plurality of slots and a coil 5 wound around the slots. The rotor 3 is held by the rotor frame 8 so as to be rotatable in the radial direction of the stator 6 through a predetermined gap with respect to the stator 6. The stator frame 9 holds the stator 6 and covers the outer periphery of the end portion (end plate 14 side) of the rotor 3.

Further, as shown in FIG. 1D, the stator frame 9 has a step 9e. The step makes it possible to position the stator core 4 in the axial length direction. As a result of the positioning, as shown in FIG. 2A, a gap is formed between the stator frame 9 and the end portion of the stator core 4 in the axial length direction, and the coil end 13 which is the end portion of the coil is formed in the gap. Is placed.

The rotor core 1 is formed from a divided core divided so as to divide the central angle of the rotation axis 90 in FIG. 1A into a plurality of parts. The split cores are fitted together and fixed.

Unlike the structure of the comparative example shown in FIG. 1F, in the first embodiment, an opening extending from the rotor frame 8 in the axial length direction and not covering the outer periphery of the rotor core 1 is formed. .. Such an opening is formed by making the length of the outer cylindrical portion 9b of the stator frame 9 that covers the outer periphery of the rotor core 1 in the axial length direction shorter than the length in the axial length direction of the rotor core 1. NS. Here, the axial length direction is the direction indicated by the arrow X.

This opening opens the rotor core 1 to the outside air, widens the surface that comes into contact with the outside air, and improves the cooling performance of the abduction type rotary electric machine 100.

However, when this structure is adopted, as in the comparative example, a narrow gap 11a is provided between the rotor frame 8 and the stator frame 9 to control this width, thereby preventing dust and water droplets from entering. It is not possible to construct a fully closed structure. The fully closed structure is a structure in which dust and water droplets that cause a failure do not enter inside the abduction type rotary electric machine 100 in which the permanent magnet 2 and the coil are present.

The configuration of the fully closed structure will be described with reference to the enlarged view of the part B of FIG. 2A shown in FIG. 2B. The differences from the comparative example are as follows. That is, a gap 11b (first gap) having a width d1 is formed in the radial direction between the rotor core 1 constituting the rotor and the stator frame 9. A gap 11c (second gap) having a width d2 is formed in the axial length direction between the end plate 14 and the stator frame 9. The rotor core 1, the stator frame 9, and the end plate 14 are arranged so that d1> d2. Here, the end plate 14 is a cylindrical member fixed to the end portion (stator frame 9 side) of the rotor core 1 in the axial length direction. The first gap and the second gap are connected to the opening.

Since the rotor core 1 tends to have irregularities on the outer peripheral surface and has a large diameter, the radial gap 11b between the rotor core 1 and the stator frame 9 cannot be a narrow gap with high accuracy. .. Further, in order to effectively utilize the loss of the electrical steel sheet at the time of punching, since the rotor core 1 is formed of the split core, it is also not possible to make a narrow gap with high accuracy.
Considering the risk of contact between the rotor core 1 and the stator frame 9 when the motor rotates, the gap 11b must have a width with a margin in consideration of dimensional error.

On the other hand, the end plate 14 and the stator frame 9 can be processed with high dimensional accuracy by using cast iron as the material. Therefore, the width of the gap 11c in the axial length direction between the end plate 14 and the stator frame 9 can be a narrow gap with high accuracy. Here, the fully closed structure of the elevator motor is assumed to satisfy the protection class IP42 defined in JISC 4034-5, and the first digit symbol 4 is a protection structure against solid foreign matter exceeding 1 mm. It is desirable that the width of d2 is less than 1 mm.

In the above-mentioned embodiment, the rotary electric machine of the elevator hoisting machine has been described, but the present embodiment is not limited to this, and can be applied to a large-diameter motor.

However, in an environment where dust is unlikely to be generated, the width may be 1 mm or more. It is possible that dimensional errors in the axial length direction may occur by laminating electromagnetic steel sheets with tolerances in the axial length direction, but accuracy is achieved by sandwiching a shim between the end plate 14 and the rotor core 1. It is easy to adjust the width high.

The end plate 14 penetrates the rotor core 1 by bolts and is fixed and supported in the axial length direction with respect to the rotor frame 8 and the rotor core 1. Further, the end plate 14 may be fixed to the rotor core 1 in the axial length direction by fitting, adhesive or the like. Even in that case, it is possible to prevent the permanent magnet 2 from popping out and the split core of the rotor from partially popping out.

In this embodiment, as shown in FIGS. 1D and 1E, for the stator frame 9, two cylindrical portions (inner cylindrical portion 9a and outer cylindrical portion 9b) having different outer diameters are circular on both sides in the axial length direction. It is configured to be connected to the plate portion (inner disc portion 9c and outer disc portion 9d). With such a configuration, the weight of the stator frame 9 can be reduced even in a rotary electric machine having a large diameter.

Further, in Patent Document 1, a gap structure is formed by a screwed cover member of another part that covers the rotor core from the outside and a stator frame. In such a configuration, it is necessary to provide screw holes in the radial direction of the rotor core. Further, stress is applied during machining, which deteriorates the electrical steel sheet, which leads to deterioration of motor characteristics. In this embodiment, such processing is unnecessary, mass production is easy, and there is no problem of deterioration of motor characteristics.

The rotor of the electric motor for elevators has a large diameter, and the split core is used to effectively utilize the loss of the electrical steel sheet during punching, so the accuracy of the outer diameter of the rotor core is low. It becomes a factor. Therefore, when the gap structure between the rotor core and the stator frame as in Patent Document 1 is applied to a large-diameter motor, it is not sufficient to prevent dust and water droplets from entering.

Further, in a large-diameter motor for an elevator, the electromagnetic steel sheets used for the rotor are laminated in the axial length direction. The cover member of Patent Document 1 is configured to be fixed to the rotor by a screw in the radial direction of the abduction type rotary electric machine. Therefore, a hole for fixing the cover member in the radial direction is formed in the rotor. In such a configuration, strain occurs in the rotor, and it is difficult to accurately adjust the width of the gap between the cover member fixed to the rotor and the plate or the fixed support.

The end plate 14 of this embodiment is fixed to the rotor core 1 in the axial length direction. In such a configuration, a bolt hole through which a fixing member such as a bolt is penetrated can be formed in advance when punching an electromagnetic steel sheet. Therefore, strain is unlikely to occur in the rotor core 1, and the width of the gap formed between the end plate 14 and the stator frame 9 can be adjusted accurately. Therefore, in this embodiment, the structure can be configured to prevent the ingress of dust and water droplets.

FIG. 3A is a diagram showing the axial length direction of the abduction type rotary electric machine 100 in the second embodiment. FIG. 3B is an enlarged view of part C of FIG. 3A. The same contents as those of the first embodiment will be omitted.

The difference from the first embodiment is that the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the radial gap 11d between the end plate 14 and the stator frame 9 is d3. At that time, d1> d3.

Since the end plate 14 and the stator frame 9 can be machined with high dimensional accuracy by using cast iron as the material, the width of the radial gap 11d between the end plate 14 and the stator frame 9 is set. It is possible to make a narrow gap with high accuracy. The radial upper end of the end plate 14 is fixed at a protruding position so as to be closer to the stator frame 9 than the upper end of the rotor core 1. Although misalignment may occur when the end plate 14 is attached to the rotor core 1, it is easy to adjust the width with high accuracy by attaching the end plate 14 while adjusting the positional relationship with the stator frame 9.

Example 3 will be described with reference to FIG. 3B as in Example 2. A gap 11b having a width d1 is formed in the radial direction between the rotor core 1 and the stator frame 9. A gap 11c having a width d2 is formed between the end plate 14 and the stator frame 9 in the axial length direction. A gap 11d having a width d3 is formed in the radial direction between the end plate 14 and the stator frame 9. In this case, the structure is d1> d2 and d1> d3. In the description of the third embodiment, the same contents as those of the second embodiment will be omitted.

In this embodiment, by setting d1> d2 and d1> d3, it is possible to form fine gaps with high accuracy at two places, and it is possible to make the structure more difficult for dust and water droplets to enter.

FIG. 4A is a diagram showing the axial length direction of the abduction type rotary electric machine 100 in the fourth embodiment. FIG. 4B is an enlarged view of a portion D of FIG. 4A. The same contents as those of the first embodiment will be omitted. The difference from Examples 1 to 3 is that the recess 15 is provided on the radial outer side of the end plate 14.

By having the recess, when dust or water droplets infiltrate, it falls into the recess, so that it is possible to prevent the abduction type rotary electric machine 100 from entering the inside (the space where the coil 5 and the permanent magnet 2 are present). The recesses 15 are provided all around the circumferential direction of the end plate, and dust and water droplets that have entered from the upper side of FIG. 4B fall into the recesses and then are discharged from the lower side of FIG. 4B, so that they are collected in the recesses 15. There is no.

At this time, as in the first embodiment, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the axial gap 11c between the end plate 14 and the stator frame 9 is d2. Then, d1> d2 may be set. Alternatively, as in the second embodiment, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the radial gap 11d between the end plate 14 and the stator frame 9 is d3. Occasionally, d1> d3 may be set. Alternatively, d1> d2 and d1> d3 may be used as in Example 3. The more places there are narrow gaps with high accuracy, the more difficult it is for dust and water droplets to enter.

FIG. 5A is a diagram showing the axial length direction of the abduction type rotary electric machine 100 in the fifth embodiment. FIG. 5B is an enlarged view of part E of FIG. 5A. The same contents as those of the first embodiment will be omitted.

The difference from Examples 1 to 4 is that the outer diameter of the end plate 14 is smaller than the outer diameter of the rotor core 1, and the end plate 14 and the rotor core 1 form a staircase-shaped portion and are fixed. The child frame 9 has a convex portion 16 at a position facing the staircase-shaped portion. Further, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the axial gap 11e between the rotor core 1 and the convex portion 16 of the stator frame 9 is d4. At that time, d1> d4.

Regarding the length of the rotor core 1 in the axial length direction, although there is a dimensional error due to laminating electromagnetic steel sheets with tolerance, it is possible to adjust with higher accuracy than the radial dimension where an error due to punching occurs. .. Further, the surface of the end portion in the axial length direction is a flat surface without unevenness. From this, the width of the gap 11e in the axial length direction between the rotor core 1 and the convex portion 16 can be a narrow gap with higher accuracy than the gap 11b.

At this time, as in the first embodiment, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the axial gap 11c between the end plate 14 and the stator frame 9 is d2. Then, d1> d2 may be set.

Further, as in the second embodiment, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the width of the radial gap 11d between the end plate 14 and the stator frame 9 is d3. Occasionally, d1> d3 may be set. Alternatively, d1> d2 and d1> d3 may be used as in Example 3. Further, as in the fourth embodiment, the recess 15 may be provided on the radial outer side of the end plate 14. By combining these elements, it is possible to create a structure that makes it more difficult for dust and water droplets to enter.

FIG. 6A is a perspective view of the abduction type rotary electric machine 100 in the middle of assembling the sixth embodiment. FIG. 6B is a perspective view of the abduction type rotary electric machine 100 after the assembly of the sixth embodiment. The same contents as the comparative example will be omitted.

The difference from the comparative example is that a plurality of holes 17 are provided in the radial direction of the outer cylindrical portion 9b of the stator frame 9 extending in the axial length direction and covering the rotor core 1. The hole 17 allows the rotor core 1 to come into contact with the outside air. The hole 17 constitutes an opening that dissipates heat from the rotor core 1. Due to this opening, the cooling performance of the abduction type rotary electric machine 100 can be improved.

Further, as a structure for preventing the intrusion of dust and water droplets, any of the structures described in Examples 1 to 5 may be used.

FIG. 7A is a perspective view of the abduction type rotary electric machine 100 during the assembly of the seventh embodiment. FIG. 7B is a perspective view of the abduction type rotary electric machine 100 after the assembly of the seventh embodiment. The same contents as those of the first embodiment will be omitted.

The difference from the first to sixth embodiments is that the rotor frame 8 has a plurality of ribs 18 extending in the axial length direction, and the ribs 18 are arranged on the outer peripheral surface of the rotor core 1. Further, the end plate 14 and the rotor frame 8 are connected to each other via the rib 18.

As with the rotor frame 8, the rib 18 can be machined with high dimensional accuracy by using cast iron as the material. As a result, as compared with Examples 1 to 5, it is not affected by the dimensional error in the axial length direction that occurs when the electromagnetic steel sheets having tolerances are laminated. Therefore, the width of the gap 11c in the axial length direction between the end plate 14 and the stator frame 9 can be more easily made into a narrow gap with high accuracy.

Since the rotor core 1 comes into contact with the outside air at a location that does not face the rib 18, there is no problem with heat dissipation. As a structure for preventing the intrusion of dust and water droplets, the width of the radial gap 11b between the rotor core 1 and the stator frame 9 is d1, and the shaft between the end plate 14 and the stator frame 9 is the same as in the first embodiment. When the width of the gap 11c in the long direction is d2, d1> d2. Alternatively, d1> d2 and d1> d3 may be used as in Example 3. Further, the recess 15 may be provided on the radial outer side of the end plate 14 as in the fourth embodiment, or the outer peripheral surface of the stator frame 9 may have a plurality of holes 17 as in the sixth embodiment. ..

FIG. 8A is a perspective view of the abduction type rotary electric machine 100 during the assembly of the eighth embodiment. FIG. 8B is a perspective view of the abduction type rotary electric machine 100 after the assembly of the eighth embodiment.

Further, FIG. 8C is a diagram showing a radial direction R in the central portion of the abduction type rotary electric machine 100 of the eighth embodiment. In FIG. 8C, the rotor frame 8 and the stator frame 9 are omitted.

The same content as in Example 1 will be omitted.

The difference from Examples 1 to 7 is that the rotor core 1 has a recess 19 on the outer peripheral surface. By providing the recess 19, the surface area of the rotor core 1 that comes into contact with the outside air increases. Therefore, the recess 19 can improve the cooling performance.

As a structure for preventing the intrusion of dust and water droplets, any of the structures described in Examples 1 to 5 may be used.

Further, as in the sixth embodiment, a plurality of holes 17 may be provided on the outer peripheral surface of the stator frame 9, and as in the seventh embodiment, a plurality of rotor frames 8 extending in the axial length direction. Ribs 18 may be provided.

As the material of the rotor core 1 and the stator core 4, as described above, an electromagnetic steel sheet containing iron as a main component can be considered, and the rotor core 1 and the stator core 1 and the stator core 1 are fixed by laminating the core shape punched out from the electromagnetic steel sheet. The child core 4 can be configured. As described above, the rotor core 1 and the stator core 4 are considered to be split cores that can be punched without waste when punching from the electrical steel sheet from the viewpoint of cost reduction, but an integrated core may also be used. .. There is a concern that the efficiency of the split core may decrease due to magnetic flux leakage due to the gap in the split portion.

If it is an integrated core, there is no magnetic flux leakage due to the gap between the split parts, so efficiency can be expected to improve. As the material of the coil 5, it is conceivable to use copper or aluminum. As the material of the end plate 14 and the stator frame 9, as described above, cast iron having high processing accuracy may be used, but other materials may be used as long as the processing accuracy is high. The end plate 14 may be made of one part or may be divided into a plurality of parts. However, when dividing into multiple parts, it is necessary to prevent the accuracy of the gap from becoming low due to misalignment during assembly.

In the above-described embodiment, the case of a three-phase drive rotary electric machine having 40 poles and 48 coils of the permanent magnet 2 has been described, but other combinations of the number of poles and the number of slots may be used.

The coil winding method can be applied to the above-mentioned embodiment regardless of whether it is a centralized winding or a distributed winding. Further, the rotor can be applied to the above-described embodiment even if it is a surface magnet type formed by attaching a permanent magnet to the surface of the rotor core. Further, even if the rotor core has a plurality of magnet insertion holes and is an embedded magnet type rotor formed by inserting a magnet into the magnet insertion holes, it can be applied to the above-described embodiment. Further, an induction motor that does not use a permanent magnet, a synchronous reluctance motor, and a switched reluctance motor can also be applied to the above-described embodiment.

1 ... Rotor core,
2 ... Permanent magnet,
3 ... Rotor,
4 ... Stator core,
5 ... coil,
6 ... Stator,
7 ... slot,
8 ... Rotor frame,
9 ... Stator frame,
9a ... Inner cylinder,
9b ... Outer cylindrical part,
9c ... Inner disk part,
9d ... Outer disk part,
9e ... Step,
10 ... Air layer,
11a, 11b, 11c, 11d ... Gap,
12 ... Heat dissipation path,
13 ... Coil end,
14 ... end plate,
15 ... recess,
16 ... Convex part,
17 ... hole,
18 ... Rib,
19 ... Recessed surface on the outer peripheral surface of the rotor core,
90 ... rotation axis,
100 ... Abduction type rotary electric machine

Claims

A stator having a plurality of slots and a coil wound around the slot,
A rotor that is rotatably held in the radial direction of the stator through a predetermined gap with respect to the stator.
A stator frame that holds the stator and
A rotor frame that holds the rotor and
It has an end plate fixed in the axial length direction at the end of the rotor.
An opening is formed between the rotor frame and the stator frame.
An abduction type rotary electric machine in which a gap connecting to the opening is formed between the stator frame and the end plate.
In the abduction type rotary electric machine according to claim 1,
The opening is
An abduction type rotary electric machine formed by making the length of the outer cylindrical portion of the stator frame in the axial length direction shorter than the length in the axial length direction of the rotor.
In the abduction type rotary electric machine according to claim 1,
The opening is
An abduction type rotary electric machine which is a hole provided in the radial direction of the stator frame.
In the abduction type rotary electric machine according to claim 1,
A first gap having a width d1 is formed in the radial direction between the rotor and the stator frame.
An abduction type rotary electric machine in which a second gap having a width d2 is formed in the axial length direction between the end plate and the stator frame, and d1> d2.
In the abduction type rotary electric machine according to claim 1,
A first gap having a width d1 is formed in the radial direction between the rotor and the stator frame.
A second gap having a width of d3 is formed in the radial direction between the end plate and the stator frame.
Abduction type rotary electric machine with d1> d3.
In the abduction type rotary electric machine according to claim 1,
A first gap having a width d1 is formed in the radial direction between the rotor and the stator frame.
A second gap having a width d2 is formed in the axial length direction between the end plate and the stator frame.
A third gap having a width of d3 is formed in the radial direction between the end plate and the stator frame.
An abduction type rotary electric machine having d1> d2 and d1> d3.
In the abduction type rotary electric machine according to claim 1,
An abduction type rotary electric machine in which a recess is provided on the outer peripheral surface of the end plate.
In the abduction type rotary electric machine according to claim 1,
The outer diameter of the end plate is smaller than the outer diameter of the rotor.
The stator frame has a convex portion at a position facing the end plate, and the stator frame has a convex portion.
A first gap having a width d1 is formed in the radial direction between the rotor and the stator frame.
An abduction type rotary electric machine in which a second gap having a width d4 is formed in the axial length direction between the rotor and the stator frame, and d1> d4.
In the abduction type rotary electric machine according to claim 8,
An abduction type rotary electric machine in which a third gap having a width d2 is formed in the axial length direction between the end plate and the stator frame, and d1> d2.
In the abduction type rotary electric machine according to claim 1,
The rotor frame has a plurality of ribs extending in the axial length direction.
An abduction type rotary electric machine to which the rib and the end plate are connected.
In the abduction type rotary electric machine according to claim 1,
An abduction type rotary electric machine in which a plurality of recesses are arranged on the outer peripheral surface of the rotor.
In the abduction type rotary electric machine according to claim 1,
The stator frame is
An abduction type rotary electric machine in which the inner cylindrical portion and the outer cylindrical portion having different outer diameters are connected to the inner disk portion and the outer disk portion on both sides in the axial length direction.