JP2011211862A - Sealed rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed rotary electric machine wherein the cooling capacity can be enhanced by circulating a refrigerant well at low cost with a simple configuration.SOLUTION: In the sealed rotary electric machine including a stator 8 having a stator core 7 around which a coil 6 is wound, and a rotor 9 having a rotor core 10 in which permanent magnets 13 are arranged rotatably in the circumferential direction while facing the stator core of the stator, a plurality of circulation holes 14 are formed in the circumferential direction on the inner circumferential side of the rotor core 10 so that the refrigerant can move in the axial direction between the load side and the anti-load side, and internal fans 15a and 15b having blades B1-B12 formed at predetermined intervals in the circumferential direction to project in the radial direction and through holes 18 whose quantity is less than that of circulation holes and which extend to the axial outside of the blades and communicate with the circulation holes are arranged at least at one axial end of the rotor core 10.

Description

  The present invention relates to a hermetic rotary electric machine having a rotor in which a permanent magnet is disposed as a magnetic pole.

In a rotating machine applied to a manufacturing process of a factory or a railway vehicle, it is desired to be sealed in order to prevent dust and liquid from entering from the outside.
However, the outer surface-cooled hermetic rotary machine using permanent magnets increases the temperature of the rotor core and magnet when the coil temperature rises. There is a risk of poor performance due to a decrease in holding force.
Further, the internal refrigerant of the hermetic type rotary machine has less convection than the open type rotary machine, and there is a possibility that the temperature of the coil or magnet locally increases. Therefore, reduction of heat transmitted from the coil whose temperature has risen to the rotor core and the magnet, and averaging of convection of the internal refrigerant are problems.

  A typical structural example of a conventional hermetic rotary machine having an internal refrigerant circulation structure is shown in FIGS. In this conventional example, a press ring 102 and an internal fan 103 shown in FIG. 12 are provided on the end surface of the rotor core 101 of the rotor 100 opposite to the driving side. In addition, a permanent magnet 104 is embedded in the rotor core 101 and a ventilation hole 105 penetrating in the axial direction is formed. By providing a through hole 107 in the stator 106 that spatially couples the opposite drive side end face from the end face on the counter drive side of the rotating machine, the refrigerant sent by the internal fan 103 installed on the counter drive side is bracketed. 108 passes between the coil end 109, flows to the driving side through the circulation hole 107 formed on the outer peripheral side of the stator 106, and returns again from the driving side through the ventilation hole 105 of the rotor 100. At this time, the internal refrigerant removes heat from the coil end 109 and the permanent magnet 104 and dissipates heat in the inner surface of the flow hole 107 of the bracket 108 and the stator 106. Can be

However, in the case of having the above-described configuration, it is necessary to form the flow hole 107 on the outer peripheral side of the stator 106, and there is a problem that the configuration of the entire rotating electrical machine is enlarged.
In recent years, various technologies have been proposed in which the inside of a rotating machine is cooled to suppress the temperature rise of the rotor 100 in which the permanent magnet 104 is arranged.
For example, by providing cooling fins on the outer peripheral surface of the rotor core on which the permanent magnet is mounted, the heat dissipation cooling area of the rotor core to the cooling air inside the machine is increased, and the temperature of the rotor core rises due to eddy current loss There is known a rotor with a permanent magnet of a magnet synchronous rotator that prevents the above-described problem (for example, see Patent Document 1).

In addition, a magnet is disposed on the inner periphery of the stator fixed to the frame via a gap, and a ring is attached to the end surface of the magnet and the rotor center for fixing the rotor center fixed to the shaft inside the magnet. And a rotor with a magnet of a rotating electrical machine having a configuration in which a spiral groove having the same spiral direction moving the air in the gap in the axial direction is formed on the outer periphery of a ring having substantially the same outer diameter as (for example, Patent Document 2).
In addition, a hub portion that connects the permanent magnet of the rotor and the rotor shaft is provided with a space that penetrates the plurality of blades in the axial direction, and is opposed to the blades provided on the rotor of the front cover and the cup-shaped case. There is known a small electric motor having a structure provided with a hole for ventilation (for example, see Patent Document 3).

  Furthermore, a stator having a coil wound around the stator core, a rotor having a rotor core in which permanent magnets are embedded in the stator field space, and an axial end of the rotor core are arranged. A cooling groove extending from the end plate side to the other end plate side on the outer periphery of the rotor core, and rotating on the end plate. A rotating electrical machine is provided with a cooling fin that takes cooling air along with the rotation of the rotor and guides it in the outer circumferential direction, and has a communication portion that projects the cooling air from the cooling fin toward the cooling groove of the rotor core. It is known (see, for example, Patent Document 4).

JP-A-8-298736 JP-A-9-252555 JP-A-9-65614 JP 2009-159663 A

However, in the conventional example described in Patent Document 1, cooling fins protruding on the inner surface of the rotor are provided to increase the heat radiation area to cool the rotor. There is an unsolved problem that the capacity is small and the refrigerant temperature in the rotating machine cannot be averaged.
Further, in the conventional example described in the above cited document 2, a ring having a spiral groove formed at the end of the rotor core is arranged so that air is moved in the axial direction by the spiral groove. In the groove, there is an unsolved problem that the amount of air movement cannot be increased, the cooling capacity is small, and the refrigerant temperature in the rotating machine cannot be averaged.
Furthermore, in the conventional example described in the above-mentioned cited document 3, the hub portion connecting the rotor magnet and the rotation shaft is provided with a plurality of blades and a space penetrating in the axial direction, and the blade provided in the rotor. However, there is an unsolved problem that the manufacturing cost increases because of a complicated hub structure.

Furthermore, in the prior art described in the above cited document 4, a cooling groove is formed on the outer periphery of the rotor, and cooling fins that take in cooling air and guide it in the outer peripheral direction as the rotor rotates are provided with the rotor. Although it has the structure arrange | positioned at both ends, while there exists a cooling groove in the outer periphery of a rotor, while the performance of an electric motor falls, it becomes a complicated cooling fin structure, but there exists an unsolved subject that manufacturing cost increases.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and has a simple structure and low cost, and can perform good circulation of the refrigerant to improve the cooling capacity. The purpose is to provide a rotary electric machine.

  In order to achieve the above object, a hermetic rotating electrical machine according to the present invention is provided with a stator having a stator core around which a coil is wound, and a stator core of the stator so as to be rotatable. A hermetic rotary electric machine including a rotor having a rotor core in which permanent magnets are arranged in a circumferential direction. On the inner peripheral side of the rotor core, a plurality of flow holes through which the refrigerant can move in the axial direction are formed in the circumferential direction. In addition, at least one of the axial ends of the rotor core has a blade formed at a predetermined interval in the circumferential direction, and communicates with the flow holes in a number smaller than the number of the flow holes. An internal fan having an extended through-hole is disposed outward.

  According to this configuration, the refrigerant is pushed out to the outer peripheral side by the centrifugal force of the blade as the internal fan rotates, so that a negative pressure is generated on the inner peripheral side of the internal fan, and the internal pressure passes through the flow hole formed in the rotor core. The refrigerant on the side opposite to the fan is sucked. On the other hand, the refrigerant pushed out to the outer peripheral side by the internal fan is returned to the side opposite to the internal fan through the through hole formed in the internal fan and the flow hole formed in the rotor core, so that the rotor core and the internal fan A refrigerant circulation path with a large circulation flow rate can be formed.

At this time, by disposing the internal fans at both ends in the axial direction of the rotor core, the through holes of the other internal fan and the through holes of the rotor core are generated by the negative pressure on the inner peripheral side generated by one of the internal fans. By sucking the refrigerant through, the refrigerant circulation flow rate can be increased and the cooling capacity can be improved.
The hermetic rotary electric machine according to the present invention includes an inner cylinder in which the internal fan inserts a rotation shaft to support the blade, and a shielding member that covers an outer side in the axial direction of the blade. It is characterized by opening to the outside of the shielding member.

  According to this configuration, the refrigerant on the inner peripheral side is pushed out to the outer peripheral side by the blade of the internal fan, and negative pressure is generated on the inner peripheral side. At this time, since the outer side in the axial direction of the blade is covered with the shielding member, the suction of the refrigerant from the outer side in the axial direction can be surely prevented, and the refrigerant is pushed out only in the outer peripheral direction. For this reason, it is possible to prevent the refrigerant from being sucked directly from the through hole that opens to the outside of the shielding member, and to improve the suction force of the refrigerant through the flow hole formed in the rotor core.

Further, the hermetic rotary electric machine according to the present invention is characterized in that the through hole is formed in a base portion of the blade on the inner cylinder side.
According to this configuration, by forming the through hole in the base portion on the inner cylinder side of the blade, a member for forming the through hole is not required, and the internal fan can be configured easily.
In the hermetic rotary electric machine according to the present invention, the through hole has a diameter on the medium inflow side opposite to the rotor core side set to be larger than the diameter on the rotor core side. It is said.
According to this configuration, the movement of the refrigerant through the through hole can be efficiently performed with a small pipe resistance.

In the hermetic rotary electric machine according to the present invention, the internal fan is fitted to a rotating shaft that passes through the rotor core so as to restrict axial movement of the rotor core and the permanent magnet. It is characterized by.
According to this configuration, since the axial movement of the rotor core is restricted by the internal fan, there is no need to separately prepare a member for regulating the axial movement of the rotor core, and the configuration of the rotating electrical machine is simplified. be able to.
The hermetic rotary electric machine according to the present invention is characterized in that the internal fan is mounted on an end face of the rotor core via a press ring.
With this configuration, since the axial movement of the rotor core is suppressed by the press ring, the rigidity of the internal fan can be reduced, and the internal fan can be reduced in weight and size.

The hermetic rotary electric machine according to the present invention is characterized in that an internal refrigerant circulation path that extends in the axial direction and allows the refrigerant to pass therethrough is formed in the stator core.
According to this configuration, by forming the internal refrigerant circulation path also in the fixed iron core, the refrigerant circulation flow rate can be increased and the cooling capacity can be further improved.
Further, in the hermetic rotating electrical machine according to the present invention, the internal fan is disposed on both ends in the axial direction of the rotor core, and the through hole of the rotor core communicates with the through hole of one internal fan. And the flow hole of the said rotor iron core which the said through-hole of the other internal fan communicates is characterized by differing.
According to this configuration, since the internal fans are arranged at both ends of the rotor core in the axial direction, the refrigerant circulation flow rate can be doubled as compared with the case where the internal fan is provided on one side, and the cooling capacity is further improved. be able to.

According to the present invention, the internal fan is formed in the rotor core by forming a number of through-holes smaller than the number of flow holes of the rotor core that extends in the axial direction and communicates with the flow holes of the rotor core. It is possible to improve the cooling capacity by forming a flow path through which the refrigerant passes through the flow hole to one side in the axial direction and a flow path through which the refrigerant is passed to form a refrigerant circulation path. An effect is obtained.
Moreover, since it is only necessary to provide a through hole in the internal fan, an effect of simplifying the configuration of the internal fan and reducing the manufacturing cost can be obtained.

1 is a longitudinal sectional view showing a first embodiment of a hermetic rotary electric machine according to the present invention. It is sectional drawing which abbreviate | omitted the press ring on the AA line in the rotor of FIG. FIG. 2 is a perspective view showing a part of the internal fan of FIG. It is a schematic diagram which shows the experimental installation for verifying the principle of this invention. It is a perspective view which shows the internal fan structure used for experiment, (a) is an internal fan equivalent to this invention, (b) is an internal fan of a prior art example. It is explanatory drawing which shows the pressure change in the experimental installation of FIG. 4, (a) is a pressure state figure of the internal fan equivalent to this invention, (b) is a pressure state figure of the internal fan of a prior art example. It is sectional drawing which shows 2nd Embodiment of the sealed rotary electric machine which concerns on this invention. FIG. 8 is a perspective view showing a part of the internal fan of FIG. It is sectional drawing which shows 3rd Embodiment of the enclosed rotary electric machine which concerns on this invention. It is sectional drawing which shows 4th Embodiment of the enclosed rotary electric machine which concerns on this invention. It is sectional drawing which shows a prior art example. It is a perspective view which shows the internal fan of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hermetic rotary electric machine. In the hermetic rotary electric machine 1, for example, both end surfaces of a cylindrical frame 2 are sealed by brackets 3a and 3b. A rotating shaft 5 is rotatably supported by the brackets 3a and 3b via a seal 4 at the center thereof.
A stator 8 having a stator core 7 formed by laminating magnetic steel plates wound with coils 6 is fixed to the inner peripheral surface of the frame 2, and a predetermined gap is provided on the inner peripheral surface of the stator 8. The outer peripheral surface of the rotor 9 fixed in the frame 2 of the rotating shaft 5 is opposed.

The rotor 9 has a rotor core 10 formed by laminating magnetic steel plates and is inserted into a through hole 10a formed at the center of the rotor shaft 5. The rotor 9 is pressed by non-magnetic press rings 11a and 11b. It is fixed.
As shown in an enlarged view in FIG. 2, the rotor core 10 has six slots 12 along each side of a hexagon that circumscribes a circle smaller than the outer peripheral surface centering on the central axis of the rotor core 10. It is formed to penetrate in the axial direction.
Each slot 12 has a rectangular permanent magnet 13 having a flat cross section that forms a magnetic pole and is fixed by bonding or the like to form an embedded magnet structure. Here, the permanent magnets 13 are magnetized in the radial direction so as to be in opposite directions with the adjacent permanent magnets 13.

In addition, twelve flow holes 14 through which the refrigerant flows are formed at a predetermined interval on the inner circumference side of the rotor core 10, that is, on a concentric circle near the insertion hole 10 a. Similarly, the press rings 11a and 11b are also formed with through holes 11c penetrating in the axial direction at positions facing the flow holes 14 as shown in FIG.
Internal fans 15a and 15b are fixedly mounted on the rotary shaft 5 outside the press rings 11a and 11b.
As shown in FIG. 3, each of the internal fans 15a and 15b has a cylindrical inner cylinder 16 into which the rotary shaft 5 is inserted, and a radius at a predetermined interval from the outer peripheral surface of the inner cylinder 16 in the circumferential direction. 12 blades B1 to B12 extending in the direction, and an annular plate 17 serving as a shielding member that covers the outside in the axial direction of each blade B1 to B12. Here, as shown in FIG. 2, the bases of the blades B <b> 1 to B <b> 12 are opposed to the flow holes 14 formed in the rotor core 10.

  For example, the odd-numbered blades B1, B3,... B11 are formed in the rotor core 10 described above by penetrating in the axial direction at the base on the inner cylinder 16 side and opening outside the annular plate 17. A through hole 18 communicating with the circulation hole 14 is formed. The number of through holes 18 is six, which is smaller than the number of through holes 14 formed in the rotor core 10. Further, in the remaining even-numbered blades B2, B4,... B12, a notch 19 is formed in the base portion facing the flow hole 14 of the rotor core 10.

  2, even-numbered blades B2, B4,... B12 facing each other between the permanent magnets 13 disposed on the rotor core 10 have a protruding length in the radial direction of the outer periphery of the rotor core 10. The length is set to reach the vicinity of the surface. Further, the odd-numbered blades B1, B3... B11 facing the central portion of the permanent magnet 13 disposed on the rotor core 10 have their tips covered to a thickness t / 2 that is half the thickness t of the permanent magnet 13. Thus, the protruding length is set to be short, and the generation of leakage magnetic flux in the permanent magnet 13 is suppressed.

And the internal fan 15a and 15b which has the said structure is made into the axial direction outer side of the press ring 11a and 11b arrange | positioned at the axial direction both ends of the rotor core 10, the annular board 17 is made into an axial direction outer side, and a through-hole 18 is attached in communication with the through holes 11c of the press rings 11a and 11b.
At this time, the internal fans 15a and 15b are configured such that the through hole 18 of the rotor core 10 communicates with the through hole 18 of the internal fan 15a through the through hole 11c of the press ring 11a, and the through hole 18 of the internal fan 15b is a press ring. The flow holes 14 of the rotor core 10 that communicate with each other through the through holes 11c of the 11b are mounted so as to be different.
And the refrigerant | coolant which consists of air, for example is enclosed in the airtight container comprised with the flame | frame 2 and the brackets 3a and 3b.

Next, the operation of the first embodiment will be described.
By supplying a drive current from the inverter to the coil 6 wound around the stator core 7, the rotor 9 is driven to rotate and operates as a synchronous rotating electrical machine.
At this time, when the rotor 9 rotates, the internal fans 15a and 15b connected via the rotating shaft 5 also rotate integrally. When these internal fans 15a and 15b rotate, the refrigerant existing on the inner peripheral side of the internal fans 15a and 15b is guided by the blades B1 to B12 and the annular plate 17 and pushed out to the outer peripheral side by centrifugal force. For this reason, a negative pressure is generated on the inner cylinder 16 side of the internal fans 15a and 15b.

The through holes 18 are not opened on the inner cylinder side of the internal fans 15a and 15b, and the flow holes 14 formed in the rotor core 10 are opened through the through holes 11c of the press rings 11a and 11b. Yes. The internal fans 15a and 15b are set so that the flow holes 14 through which the through holes 18 communicate are different as shown in FIG.
Therefore, in the internal fan 15a, as shown in the upper half part of FIG. 1, the through hole 18 of the internal fan 15b is a through hole 11c of the press ring 11b, a flow hole 14 of the rotor core 10, and a through hole 11c of the press ring 11a. A refrigerant passage is formed through communication. For this reason, the internal fan 15a sucks the refrigerant on the internal fan 15b side through the refrigerant passage.
Similarly, in the internal fan 15b, as shown in the lower half of FIG. 1, the through holes 18 of the internal fan 15a are formed as through holes 11c in the press ring 11a, through holes 14 in the rotor core 10, and through holes in the press ring 11b. A refrigerant passage is formed by communication through 11c. For this reason, the internal fan 15b sucks the refrigerant on the internal fan 15a side through the refrigerant passage.

  Therefore, for example, the refrigerant sucked from the internal fan 15b side by the internal fan 15a is pushed out to the outer peripheral side by the centrifugal force and is directed to the coil end 6e of the coil 6 of the stator 8 to cool the coil end 6e. In this state, the through hole 18 of the internal fan 15a communicates with the internal fan 15b through the through hole 11c of the press ring 11a, the flow hole 14 of the rotor core 10, and the through hole 11c of the press ring 11b. For this reason, the refrigerant | coolant around this through-hole 18 is attracted | sucked by the internal fan 15b. Therefore, the refrigerant pushed toward the coil end 6 e by the internal fan 15 a is guided by the frame 2, the bracket 3 a and the annular plate 17 and reaches the inner peripheral side of the annular plate 17. Thereafter, the coil end 6e is sucked by the internal fan 15b and pushed outward by the centrifugal force of the blades B1 to B12 of the internal fan 15b to cool the coil end 6e. Thereafter, a refrigerant circulation path that is sucked from the through hole 18 of the internal fan 15b and returns to the internal fan 15a through the through hole 11c of the press ring 11b, the flow hole 14 of the rotor core 10, and the through hole 11c of the press ring 11a. It is formed. At this time, since the refrigerant is sucked by both the internal fans 15a and 15b, the flow rate of the refrigerant flowing through the refrigerant circulation path can be increased, and a large cooling capacity can be exhibited.

In this way, the refrigerant circulates between the internal fan 15a side and the internal fan 15b side in the refrigerant circulation path, and without forming a circulation path on the outer peripheral side of the stator core 7 as described above, A refrigerant circulation path can be formed on the rotor 9 side, and the hermetic rotary electric machine can be reduced in size while ensuring the cooling capacity.
In addition, the internal fans 15a and 15b can ensure refrigerant circulation only by forming a smaller number of through holes 18 than the through holes 14 formed in the rotor core 10, and the internal fans 15a and 15b. Can be simplified, and the manufacturing cost can be reduced.

In order to verify the effect of the first embodiment, as shown in FIG. 4, the rotor 9 is configured by mounting the rotor core 10 and the internal fans 15 a and 15 b on the rotating shaft 5.
At this time, as shown in FIG. 5 (a), the internal fans 15a and 15b are configured such that every other six blades 21 are closed with a fan-shaped portion 22 and the fan-shaped portion 22 reaches an annular plate 23. A simple model configuration in which the through-hole 24 in the direction is formed. Further, the through hole 24 of the internal fan 15a and the through hole 24 of the internal fan 15b were communicated with different flow holes 26 formed in the rotor core 25 shown in FIG.

Then, as shown in FIG. 4, the refrigerant chambers 31a and 31b are formed so as to cover the internal fans 15a and 15b of the rotor 9, and the wall surface temperature of the driving-side refrigerant chamber 31a is fixed at 100 ° C. The wall surface temperature of the refrigerant chamber 31b is fixed at 50 ° C. In this state, when the rotor 9 was rotated at a rotation speed of 1800 min ⁻¹ , pressure distributions in the refrigerant chambers 31a and 31b, the rotor 9 and the internal fans 15a and 15b were measured.

  In this measurement result, as shown in FIG. 6A, the pressure on the outer peripheral side of the refrigerant chambers 31a and 31b is the highest, and the pressure gradually decreases toward the center side. Further, a region where the through holes 24 of the internal fans 15a and 15b are not formed, that is, a portion where the fan-shaped portion 22 is not formed between the blades 21 has a negative pressure at the inner peripheral surface side to become a minimum pressure, and a rotation communicating with this. Although the pressure on the inlet side of the flow hole 26 of the core iron core 25 is slightly higher, it is a negative pressure. Further, the internal pressure of the flow hole 26a is further increased, but the negative pressure is continued, and the positive pressure is obtained at the inlet side of the through hole 24 of the internal fan 15b.

  From this measurement result, negative pressure is generated at the center of the portion of the internal fan 15a (or 15b) where the through hole 24 is not formed, and at the position of the through hole 24 of the internal fan 15b (or 15a) facing this, It was proved that the pressure was positive and there was a clear pressure difference between the two. Although not shown, the temperature difference ΔT at the absolute temperature of the refrigerant chambers 31a and 31b is 31K, which is 38% lower than the initially set temperature difference ΔT = 50K, and between the refrigerant chambers 31a and 31b. It was proved that there was refrigerant circulation.

On the other hand, as shown in FIG. 5 (b), the internal fans 15a and 15b are composed of a rotor having the same configuration as that of the conventional example from which the fan-shaped portion 22 is removed. When the pressure distribution is measured, the result is as shown in FIG. 6B. Although negative pressure is generated on the inner peripheral side of the internal fans 15a and 15b, the internal fan 15a side and the internal side of the circulation hole 26 of the rotor 9 are obtained. It was confirmed that there was almost no pressure difference between the fan 15b side. Further, the temperature difference ΔT between the refrigerant chambers 31a and 31b was 50K, and it was confirmed that there was no change from the initial setting.
For this reason, it was proved that the refrigerant on the opposite side could not be sucked by the internal fans 15a and 15b, respectively, and no refrigerant circulation path was formed between the internal fans 15a and 15b.

From the above results, as in the present embodiment, by forming the through holes 18 in the internal fans 15a and 15b, a refrigerant circulation path that passes through the flow holes 14 of the rotor core 10 is formed, thereby improving the cooling performance. It has been demonstrated that
In the first embodiment, the number of through holes 18 formed in the internal fans 15a and 15b is set to half the number of the through holes 14 formed in the rotor core 10, but the required cooling capacity is achieved. Accordingly, the total number of through holes of the internal fans 15a and 15b can be set to be less than the number of flow holes 14.
Further, the number of through holes of the internal fans 15a and 15b is set to the same number in order to balance the flow rate of the flow holes 14 formed in the rotor core 10 from the internal fan 15a to the internal fan 15b and the flow rate in the opposite direction. It is desirable to do. However, the number of through holes of the internal fans 15a and 15b may be changed by changing the diameter of the flow hole 14 formed in the rotor core 10.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the movement of the rotor core 10 is directly regulated by the internal fans 15a and 15b, and the flow path resistance of the refrigerant is reduced.
That is, in the second embodiment, as shown in FIG. 7, in the configuration of the first embodiment described above, the press rings 11a and 11b are omitted, and the internal fans 15a and 15b are replaced with the rotary shaft 5 instead. The movement of the rotor core 10 in the axial direction is restricted by fitting the rotor core 10 to each other. Further, as shown in FIGS. 7 and 8, the through holes 18 of the internal fans 15a and 15b are formed in a tapered shape having a larger diameter on the annular plate 17 side than the diameter on the rotor core 10 side. The other configurations have the same configurations as those of the first embodiment described above, and the same reference numerals are given to the corresponding portions to those in FIGS. 1 and 3, and the detailed description thereof will be omitted.

  According to the second embodiment, similar to the first embodiment described above, the refrigerant circulation path can be formed by using different circulation holes 14 between the internal fans 15a and 15b, thereby improving the cooling capacity. be able to. In this case, the cooling performance depends on the moving speed of the refrigerant, and the flow path resistance of the refrigerant circulation path has a great influence. In this flow path resistance, what is dominant is the through-hole 18 on the refrigerant inflow side of the internal fans 15a and 15b. For this reason, channel resistance can be reduced by making the through-hole 18 into the taper shape which makes the diameter of the refrigerant | coolant inflow side larger than the diameter by the side of the circulation hole 14 of the rotor core 10. FIG. Thereby, the moving speed of a refrigerant | coolant can be made quick and the cooling capability of the enclosed rotary electric machine 1 can be improved.

Further, according to the second embodiment, since the non-magnetic press rings 11a and 11b can be omitted, the number of parts can be reduced by this amount, and the manufacturing cost can be reduced. Can also be reduced. Further, by omitting the press rings 11a and 11b, the thermal resistance in the press rings 11a and 11b becomes zero, leading to an improvement in cooling capacity.
In this case, as described in the first embodiment, the protruding length of the blades B1, B3,... By doing so, even if the blades B1, B3... B11 are in direct contact with the end face of the permanent magnet 13, the leakage flux in the axial direction of the permanent magnet 13 can be sufficiently suppressed. The rotating electrical machine performance similar to that of the first embodiment can be maintained.

Next, a third embodiment of the present invention will be described with reference to FIG.
The third embodiment is applied to the hermetic rotary electric machine 1 that generates little heat and does not require a high cooling capacity.
That is, in the third embodiment, as shown in FIG. 9, in the configuration of FIG. 1 in the first embodiment described above, the press ring 11a is omitted, and instead of the second embodiment described above. Furthermore, the axial movement of the rotor core 10 is restricted by the internal fan 15a. Further, the internal fan 15b is omitted.

According to the third embodiment, it corresponds to the case where the heat generated in the stator 8 is small, and the internal fan 15b is omitted and only one of the internal fans 15a is provided. Therefore, the internal fan 15b is omitted. Although the refrigerant suction capacity is reduced and the cooling capacity is reduced, there is no problem when the heat generation in the stator 8 is small and the cooling capacity is sufficient, and the internal fan 15b is omitted. The manufacturing cost can be reduced and the windage loss can be reduced.
In the above-described embodiment, the case where the internal fan 15b is omitted has been described. However, even if the internal fan 15a is omitted and only the internal fan 15b is provided, the same effect as described above can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
In the fourth embodiment, the cooling capacity is further improved in the second embodiment described above.
That is, in the fourth embodiment, as shown in FIG. 10, in the configuration of FIG. 7 in the second embodiment described above, for example, the through-hole 18 of the internal fan 15b in the frame 2 outside the stator 8, that is, the odd number 7 except that the refrigerant circulation path 40 is formed at one or more positions facing the blades B1, B3,... B11. For this reason, parts corresponding to those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the fourth embodiment, the refrigerant can be circulated through the refrigerant circulation path passing through the through hole 18 of the internal fan 15a and the refrigerant circulation path 40 formed in the frame 2, and the refrigerant between the internal fans 15a and 15b. The flow rate can be increased, and the cooling capacity can be further improved. At this time, by increasing the cross-sectional area of the refrigerant circulation path 40 formed in the frame 2, the flow resistance can be reduced and the cooling capacity can be further improved.

In the fourth embodiment, in order to ensure the refrigerant flow rate in the refrigerant circulation path 40 formed on the stator side, the number of through holes in one of the internal fans 15a and 15b is made larger than the number of through holes in the other. It is preferable to increase the flow rate of the refrigerant to be sucked.
In addition, in 4th Embodiment, although the case where the refrigerant circuit 40 was added to 2nd Embodiment was demonstrated, it is not limited to this, The refrigerant circuit 40 is added to 1st or 3rd embodiment. May be added.

  Moreover, in the said 1st-4th embodiment, the case where the number of the through-holes 14 formed in the rotor core 10 was set to 12 and the number of the through-holes 18 formed in the internal fans 15a and 15b was set to 6 was demonstrated. However, it is not limited to this, The number of the circulation holes 14 and the number of the through-holes 18 can be set arbitrarily. Further, the through holes 18 of the internal fans 15a and 15b are formed in the inner cylinder 16 by forming the inner cylinder 16 thicker, instead of forming the through holes 18 at the bases of the blades B1, B3... B11. May be.

Moreover, in the said 1st-4th embodiment, although the case where air was applied as a refrigerant | coolant was demonstrated, it is not limited to this, Arbitrary fluids, such as another gas or a liquid, are applied as a refrigerant | coolant. can do.
Moreover, in the said 1st-4th embodiment, although the case where it comprised to the embedded magnet (IPM: Interior Permanent Magnet) structure which embedded the permanent magnet 13 in the rotor 9 was demonstrated, it is limited to this Instead, a rotor having a surface permanent magnet (SPM) structure in which permanent magnets are arranged on the outer peripheral surface of the rotor core 10 may be used.

  DESCRIPTION OF SYMBOLS 1 ... Sealing type rotary electric machine, 2 ... Frame, 3a, 3b ... Bracket, 5 ... Rotating shaft, 6 ... Coil, 7 ... Stator iron core, 8 ... Stator, 9 ... Rotor, 10 ... Rotor iron core, 11a, DESCRIPTION OF SYMBOLS 11b ... Press ring, 13 ... Permanent magnet, 14 ... Flow hole, 15a, 15b ... Internal fan, 16 ... Inner cylinder, B1-B12 ... Blade, 17 ... Circular plate, 18 ... Through-hole, 40 ... Refrigerant circulation path

Claims (8)

A stator having a stator core around which a coil is wound;
A hermetic rotary electric machine comprising a rotor having a rotor core in which permanent magnets arranged rotatably in a circumferential direction facing the stator core of the stator,
A plurality of flow holes in which the refrigerant can move in the axial direction are formed in the circumferential direction on the inner peripheral side of the rotor core,
A blade formed at a predetermined interval in the circumferential direction on at least one of axial end portions of the rotor core, and communicates with the flow holes in a number smaller than the number of the flow holes. An internal fan having an extended through-hole is disposed toward the housing.   The internal fan includes an inner cylinder that inserts a rotation shaft to support the blade, and a shielding member that covers an outer side in the axial direction of the blade, and the through hole opens to the outside of the shielding member. The hermetic rotary electric machine according to claim 1.   The hermetic rotary electric machine according to claim 2, wherein the through hole is formed in a base portion of the blade on the inner cylinder side.   4. The medium according to claim 1, wherein the through-hole has a diameter on the medium inflow side opposite to the rotor core with respect to the diameter on the rotor core side. The hermetic rotary electric machine according to 1.   5. The internal fan is fitted to a rotary shaft through which the rotor core is inserted so as to restrict axial movement of the rotor core and the permanent magnet. 6. The hermetic rotary electric machine according to item 1.   5. The hermetic rotary electric machine according to claim 1, wherein the internal fan is attached to an end face of the rotor core via a press ring.   The hermetic rotary electric machine according to any one of claims 1 to 6, wherein an internal refrigerant circulation path that extends in the axial direction and passes the refrigerant is formed in the stator core.   The internal fans are arranged on both ends of the rotor core in the axial direction, respectively, and the through hole of the rotor core that communicates with the through hole of one internal fan and the through hole of the other internal fan communicate with each other. The hermetic rotary electric machine according to any one of claims 1 to 7, wherein the rotor iron core has a different flow hole.