JP4567212B2 - Cooling structure of rotating electric machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for a rotating electrical machine that rotates a rotor in a gas turbine engine or the like.
[0002]
[Prior art]
Conventionally, as a rotating electric machine that rotates a rotor with a gas turbine engine, for example, there is a generator 101 shown in a cross-sectional view of FIG. Therefore, here, the generator 101 of FIG. 7 will be described. As shown in FIG. 7, the generator 101 is attached in a state where a cylindrical stator 107 is housed in a casing 102, and a rotor 108 is inserted into a hollow portion of the stator 107.
[0003]
In this respect, as shown in FIG. 8, the stator 107 is fixed by winding a conductive wire of a coil 105 between teeth 104 of a laminated silicon steel plate 103 (corresponding to “laminated plate”). It is. Such fixing is performed in a vacuum state with an epoxy-mixed resin 106 having a thermal conductivity of about 1.43 (W / m · K), so that the thermal conductivity inside the stator 107 is good.
[0004]
On the other hand, the rotor 108 is fixed by covering a permanent magnet installed on the peripheral surface of the shaft with a metal ring, and is supported by a front bearing 123F and a rear bearing 123R. That is, as shown in FIG. 7, the front retainer 122F holding the front bearing 123F is fixed to the front flange 121F, and the front flange 121F is bolted to the front end surface of the casing 102, whereby the front end of the rotor 108 is obtained. Is rotatably supported.
[0005]
Further, the rear retainer 122R holding the rear bearing 123R is fixed to the rear flange 121R, and the rear flange 121R is bolted to the rear end surface of the casing 102, whereby the rear end of the rotor 108 is rotated. It is supported movably. For the rear bearing 123R, a coil spring 129 is interposed between the preload member 128 that is in contact with the rear bearing 123R and the lid 130 that is bolted to the rear flange 121R. An external force is applied in the thrust direction of the rotor 108 in advance.
[0006]
Then, by connecting the front end of the rotor 108 to the output shaft of the gas turbine engine, the rotor 108 can be rotated at a high speed by the gas turbine engine.
However, at this time, since there is a possibility that the lubricating oil cannot be effectively fed by the wind pressure due to the high speed rotation of the rotor 108, the front jet nozzle 124F injects the lubricating oil onto the bearing portion of the front bearing 123F, and the rear jet Forced lubrication is performed by injecting lubricating oil onto the bearing portion of the rear bearing 123R with the nozzle 124R.
[0007]
Therefore, the mist of the lubricant injected from the front jet nozzle 124F and the rear jet nozzle 124R fills the casing 102. However, the lubricating oil condensed and liquefied above the inner wall of the front flange 121F is collected in a groove 126F provided on the inner wall of the front flange 121F, and then flows down to the bottom surface of the casing 102 to reach the bottom surface of the casing 102. It is discharged from the provided lubricating oil outlet 131. Similarly, the lubricating oil condensed and liquefied above the inner wall of the rear flange 121R is collected in the groove 126R provided on the inner wall of the rear flange 121R, and then flows down to the bottom surface of the casing 102. The oil is discharged from a lubricating oil discharge port 131 provided on the bottom surface of the casing 102. Therefore, the lubricating oil liquefied from the mist does not adhere to the rotor 108 that rotates at high speed.
[0008]
Further, the liquid lubricating oil injected from the front jet nozzle 124F and passing through the bearing portion of the front bearing 123F collides with the front oil thrower 125F attached to the rotor 108, and the front lubrication provided on the front flange 121F. After ejecting from the oil ejection port 127F, it flows down to the bottom surface portion of the casing 102 and is discharged from the lubricating oil discharge port 131 provided in the bottom surface portion of the casing 102. Similarly, the liquid lubricant injected from the rear jet nozzle 124R and passed through the bearing portion of the rear bearing 123R collides with the rear oil thrower 125R attached to the rotor 108, and the rear side After ejecting from the rear side lubricating oil outlet 127 </ b> R provided in the flange 121 </ b> R, it flows down to the bottom surface portion of the casing 102 and is discharged from the lubricating oil discharge port 131 provided in the bottom surface portion of the casing 102. Therefore, the liquid lubricant does not adhere to the rotor 108 that rotates at high speed.
[0009]
Therefore, in the generator 101 of FIG. 7, since liquid lubricating oil does not adhere to the rotor 108 that rotates at high speed, it is possible to prevent the occurrence of stirring loss. However, in the generator 101 of FIG. 7, not only the above-described stirring loss but also heat loss such as iron loss and copper loss can be considered, so it is necessary to suppress the temperature rise of the stator 107 and the rotor 108.
[0010]
Therefore, in the generator 101 of FIG. 7, the both ends 110 of the housing 109 of the stator 107 are brought into close contact with the inner wall of the casing 102 via the O-ring 132, so that the housing 109 of the stator 107 and the inner wall of the casing 102 A jacket space 111 is formed between the plurality of heat dissipating fins 112 provided on the outer peripheral surface of the cylinder of the housing 109 of the stator 107, and further provided in the casing 102. The cooling structure in which a coolant such as oil is sent from the coolant supply port 113 suppresses an increase in temperature of the stator 107, the rotor 108, and the like.
[0011]
[Problems to be solved by the invention]
However, in the generator 101 of FIG. 7, for example, when operating at 50 kW with the rotational speed of the rotor 108 being 60000 rpm or more, in addition to heat loss of the stator 107 and the rotor 108, the permanent magnets of the rotor 108 are covered. Although there is a demand for keeping the surface temperature of the rotor 108 below 180 ° C. due to the 0.2% high temperature creep proof strength characteristic of the metal ring, in this case, the temperature of the stator 107 and the rotor 108 is measured by the temperature measurement of FIG. When measured at points A, B, C, and D, the results shown in the table of FIG. 9 are obtained, and the surface temperature of the rotor 108 rises to about 208 ° C. Therefore, in the cooling structure of the generator 101 in FIG. 7, the surface temperature of the rotor 108 cannot be suppressed to 180 ° C. or less, and thus the temperature rise of the stator 107, the rotor 108, etc. is a factor that limits the improvement of the power generation output. It was one.
[0012]
Therefore, the present invention has been made to solve the above-described problems, and the internal temperature of the stator in which the coil is fixed with resin, and the surface temperature of the rotor inserted in the hollow portion of the stator, It aims at providing the cooling structure of the rotary electric machine which can suppress the temperature rise at the time of a driving | operation more.
[0016]
[Means for Solving the Problems]
Moreover, the claim made | formed in order to solve the subject mentioned above 1 The invention according to the present invention includes a casing, a stator that is accommodated in the casing and interposed between the teeth of the laminated plate and fixed with resin, a rotor that is inserted in a hollow portion of the stator, A jacket space formed between the housing of the stator and the inner wall of the casing, and an outer periphery of the stator housing are provided by bringing both end portions of the housing into close contact with the inner wall of the casing. In the cooling structure of the rotating electrical machine having a plurality of heat radiation fins and a coolant supply port provided in the casing and communicating with the jacket space, the stator is formed by solidifying the bent portion of the coil with the resin. A resin flange formed to protrude from both edge ends of the housing; Shaped portion A groove formed on the peripheral surface of the resin flange portion by the projecting edge portion provided on the peripheral edge of the housing, the both end portions of the housing and the projecting edge portion of the resin flange portion, The casing includes a coolant passage port that is provided at both edge ends of the housing to allow the jacket space and the peripheral surface of the resin flange portion to communicate with each other. On the other hand, the casing has a periphery of the resin flange portion of the stator. It is characterized by having a refrigerant discharge port for discharging the refrigerant flowing down from the surface to the outside.
[0017]
Claims 2 The invention according to claim 1 The stator is provided with a refrigerant passage in which gaps between the radiating fins of the housing are arranged in a row, and the refrigerant passage is arranged on a straight line connecting the refrigerant passage ports. It is characterized by that.
Claims 3 The invention according to claim 2 A cooling structure for a rotating electric machine according to claim 1, wherein the refrigerant passage of the stator is provided at the top of the housing of the stator, and the refrigerant supply port of the casing is provided at the bottom of the casing. .
[0018]
Claims 4 The invention according to claim 1 To claims 3 The rotating electrical machine cooling structure according to any one of the above, characterized by comprising an orifice attached to a refrigerant supply port of the casing.
[0019]
In the cooling structure for a rotating electrical machine of the present invention having such a feature, when the refrigerant is fed into the jacket space from the refrigerant supply port of the casing, a large number of radiating fins interposed in the jacket space and the radiating fins are provided around the jacket space. Heat is dissipated from the stator housing thus formed to the refrigerant in the jacket space. Therefore, inside the stator, heat is transferred from the coil, resin, and laminated board to the housing due to heat conduction, and at the same time, heat is transferred from the rotor surface to the stator due to heat transfer between the stator and the rotor. To do.
[0020]
In the cooling structure for a rotating electric machine according to the present invention, the refrigerant in the jacket space is sent to the peripheral surface of the resin flange portion of the stator through the refrigerant passage ports at both ends of the stator housing. Therefore, heat is radiated to the refrigerant from the peripheral surface of the resin flange portion of the stator, and heat moves from the coil to the peripheral surface by heat conduction or the like inside the resin flange portion of the stator. In this respect, the bent portion of the coil exists inside the resin flange portion of the stator, the coil conductors are densely packed, and the thermal conductivity of the coil conductor (for example, copper wire) is general. Therefore, a large amount of heat inside the stator moves to the peripheral surface via the coil. Accordingly, along with this, a large amount of heat is transferred from the rotor surface to the stator between the stator and the rotor by heat transfer or the like.
[0021]
The refrigerant on the peripheral surface of the resin flange portion of the stator flows down the peripheral surface along the protruding edge portion of the peripheral surface while taking heat away from the peripheral surface, and then flows down to the bottom surface portion of the casing. It is discharged to the outside through the discharge port.
[0022]
That is, in the cooling structure for a rotating electric machine according to the present invention, a large number of radiating fins interposed in the jacket space, and such radiating fins are provided around the refrigerant sent into the jacket space via the refrigerant supply port of the casing. In addition to that, heat is released from the stator housing, and in addition to the refrigerant sent from the jacket space to the peripheral surface of the resin flange portion of the stator through the refrigerant passage ports at both ends of the stator housing, Heat is dissipated from the peripheral surface of the resin flange portion of the stator.In this respect, inside the resin flange portion of the stator, a large amount of heat inside the stator moves to the peripheral surface via the coil. Even between the stator and the rotor, a large amount of heat moves from the rotor surface to the stator. The surface temperature of the rotor interposed in the hollow portion of such stators, can be suppressed more the temperature rise during operation.
[0023]
Further, in the rotating electrical machine cooling structure of the present invention, comprising a refrigerant passage in which the gaps of the respective radiating fins of the stator housing are arranged in a row, on a straight line connecting the refrigerant passage ports at both ends of the stator housing, By arranging the refrigerant passages in a row, a flow toward the refrigerant passage port along the refrigerant passage can be formed for the refrigerant sent into the jacket space, so that the peripheral surface of the resin flange portion of the stator from the jacket space It is possible to smoothly feed the refrigerant into the tank.
[0024]
Further, at this time, if the refrigerant passage of the stator is provided at the topmost portion of the housing of the stator, and the refrigerant supply port of the casing is provided at the bottom surface portion of the casing, it is fed into the jacket space via the refrigerant supply port of the casing. The refrigerant first flows from the lowest part of the jacket space to the highest part, and then flows along a refrigerant passage provided at the highest part of the stator housing. Next, the refrigerant passes through the refrigerant passage ports at both end edges of the stator housing. Through the outer space of the resin flange portion of the stator from the jacket space, and then flows down the peripheral surface of the resin flange portion of the stator. The flowing refrigerant can be distributed effectively.
[0025]
Further, in the rotating electrical machine cooling structure according to the present invention, if an orifice attached to the refrigerant supply port of the casing is provided, the flow rate of the refrigerant fed into the jacket space and consequently the peripheral surface of the resin flange portion of the stator can be adjusted. Therefore, it is possible to reliably prevent the refrigerant from overflowing from the projecting edge portion of the peripheral surface of the resin flange portion of the stator via the orifice.
[0026]
Claims 5 The invention according to claim 1 to claim 1 4 The rotating electrical machine cooling structure according to any one of the above, wherein the rotor is rotated by a gas turbine engine.
[0027]
That is, in the cooling structure for a rotating electrical machine according to the present invention, if the rotor is rotated by a gas turbine engine, the internal temperature of the stator and the surface temperature of the rotor tend to be remarkably increased due to high-speed rotation of the rotor. The effect mentioned above can be exhibited greatly.
[0028]
The rotating electrical machine having the rotating electrical machine cooling structure of the present invention includes a generator, an electric motor, and the like.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The cooling structure of the rotating electrical machine according to the present embodiment is mainly a modification of the stator 107 in the cooling structure of the generator 101 of FIG. 7 described in the section of the prior art. Accordingly, the outline of the generator having the rotating electrical machine cooling structure of the present embodiment is the same as the generator 101 of FIG. 7 described in the section of the prior art, and thus detailed description thereof is omitted. Further, the reference numerals in FIGS. 7 to 8 used in the column of the prior art are also used in the description of this column.
[0030]
As shown in FIG. 1, in the generator 1 having the rotating electrical machine cooling structure of the present embodiment, the bent portion 11 of the coil 105 that protrudes from both end portions 110 of the housing 109 is made of resin 106 in the stator 107. The resin flange portion 12 is formed by hardening in a vacuum state, and a protruding edge portion 13 is provided around the peripheral end of the resin flange portion 12. Accordingly, the peripheral surface 17 of the resin flange portion 12 is formed into a groove shape by both edge portions 110 of the housing 109 and the protruding edge portion 13 of the resin flange portion 12.
[0031]
Further, each of the plurality of radiating fins 112 is formed in a so-called “C” shape on the cylindrical outer peripheral surface of the housing 109 of the stator 107. Here, as shown in the plan view of FIG. At the top of the cylindrical outer peripheral surface of the housing 109, there is provided a refrigerant passage 15 in which gaps between the heat dissipating fins 112 are arranged. Further, both edge portions 110 of the housing 109 of the stator 107 are provided with a refrigerant passage port 14 on the extended line of the refrigerant passage 15, and therefore, the O-ring 132 is disposed above the refrigerant passage port 14. In addition, the jacket space 111 and the peripheral surface 17 of the resin flange portion 12 are in communication with each other (see FIG. 1).
The reason why the width of the heat dissipating fin 112 formed at the center of the cylindrical outer peripheral surface of the housing 109 of the stator 107 is large is to increase the rigidity of the housing 109 of the stator 107.
[0032]
On the other hand, as shown in FIG. 1, the bottom surface of the casing 102 is provided with a refrigerant supply port 113. Here, the flow rate of the refrigerant fed into the jacket space 111 is adjusted by fitting the orifice 16. ing.
[0033]
Therefore, in the cooling structure of the rotating electrical machine of the present embodiment provided in the generator 1 (hereinafter referred to as “the cooling structure of the generator 1 of the present embodiment”), as shown in FIG. When the refrigerant is fed into the jacket space 111 from the supply port 113, the heat radiation fins 112 interposed in the jacket space 111 and the housing 109 of the stator 107 around which the heat radiation fins 112 are provided to the refrigerant in the jacket space 111. Heat is released. Therefore, in the stator 107, heat is transferred from the coil 105, the resin 106 (see FIG. 3), and the laminated silicon steel plate 103 to the housing 109 by heat conduction, and at the same time, heat is also transferred between the stator 107 and the rotor 108. Heat is transferred from the surface of the rotor 108 to the stator 107 by transmission or the like.
[0034]
In the “cooling structure of the generator 1 of the present embodiment”, as shown in FIG. 1, the refrigerant in the jacket space 111 passes through the refrigerant passage ports 14 at both end edges 110 of the housing 109 of the stator 107 ( 2), it is fed into the peripheral surface 17 of the resin flange portion 12 of the stator 107. Therefore, since heat is radiated to the refrigerant from the peripheral surface 17 of the resin flange portion 12 of the stator 107, heat moves from the coil 105 to the peripheral surface 17 due to heat conduction or the like inside the resin flange portion 12 of the stator 107. In this respect, the bent portion 11 of the coil 105 exists inside the resin flange portion 12 of the stator 107, the conductors of the coil 105 are densely packed, and further, the conductor of the coil 105 (for example, a copper wire) Since the thermal conductivity is generally high, a large amount of heat inside the stator 107 moves to the peripheral surface 17 via the coil 105. Accordingly, along with this, a large amount of heat is transferred from the surface of the rotor 108 to the stator 107 also between the stator 107 and the rotor 108 by heat transfer or the like.
[0035]
Therefore, when the generator 1 is operated at 50 kW with the rotation speed of the rotor 108 being 60000 rpm or more, the temperature of the stator 107 or the rotor 108 is measured at the temperature measurement points A, B, C, and D in FIG. Then, the result shown in the table of FIG. 4 is obtained (same as FIG. 8 described in the section of the prior art), and the resin 106 inside the stator 107 is compared with the cooling structure of the generator 101 of FIG. 7 described in the section of the prior art. And the surface temperature of the rotor 108 become low. In particular, in the “cooling structure of the generator 1 of the present embodiment” (see FIG. 1), the increase in the surface temperature of the rotor 108 stops at about 180 ° C., and the rotational speed of the rotor 108 is increased to 60000 rpm or more and 50 kW. Can be satisfied (as an example of an index, the surface temperature of the rotor 108 should be about 180 ° C. or lower).
[0036]
The refrigerant on the peripheral surface 17 of the resin flange portion 12 of the stator 107 flows down the peripheral surface 17 along the protruding edge portion 13 of the peripheral surface 17 while taking heat from the peripheral surface 17, and It flows down to the bottom surface portion and is discharged to the outside from a lubricating oil discharge port 131 (in this embodiment, corresponding to a “refrigerant discharge port”).
[0037]
That is, in the “cooling structure of the generator 1 of the present embodiment”, as shown in FIG. 1, the jacket space 111 against the refrigerant sent into the jacket space 111 via the refrigerant supply port 113 of the casing 102. Heat is dissipated from a large number of heat dissipating fins 112 interposed between them and the housing 109 of the stator 107 around which the heat dissipating fins 112 are provided. 14 (see FIG. 2), heat is radiated from the peripheral surface 17 of the resin flange portion 12 of the stator 107 to the refrigerant sent from the jacket space 111 to the peripheral surface 17 of the resin flange portion 12 of the stator 107. In this respect, inside the resin flange portion 12 of the stator 107, the stator 107 is interposed via the coil 105. A large amount of internal heat moves to the peripheral surface 17, and accordingly, a large amount of heat also moves between the stator 107 and the rotor 108 from the surface of the rotor 108 to the stator 107. Compared to the cooling structure of the generator 101 in FIG. 7, the internal temperature of the stator 107 in which the coil 105 is fixed by the resin 106 (see FIG. 3) and the surface temperature of the rotor 108 inserted in the hollow portion of the stator 107. The temperature rise during operation can be further suppressed (see FIG. 4).
[0038]
Further, in the cooling structure of “the generator 1 of the present embodiment”, as shown in FIG. 2, the cooling passage 15 in which the gaps between the radiation fins 112 of the housing 109 of the stator 107 are arranged is provided, and the stator 107 The refrigerant passages 15 are arranged in a line on the straight line connecting the refrigerant passage ports 14 at both end edges 110 of the housing 109, and the refrigerant passage 15 is provided for the refrigerant sent into the jacket space 111 (see FIG. 1). Therefore, it is possible to form a flow toward the refrigerant passage port 14 along the outer circumferential surface of the resin flange portion 12 of the stator 107 from the jacket space 111 (see FIG. 1). .
[0039]
Further, here, as shown in the plan view of FIG. 2, the refrigerant passage 15 of the stator 107 is provided at the top of the housing 109 of the stator 107, while the refrigerant supply port 113 of the casing 102 is provided with the casing as shown in FIG. The refrigerant sent to the jacket space 111 via the refrigerant supply port 113 of the casing 102 first flows from the lowest part of the jacket space 111 to the topmost part, and then the housing of the stator 107. 109 flows along a refrigerant passage 15 (see FIG. 2) provided at the top of 109, and then passes through a refrigerant passage 14 (see FIG. 2) at both end edges 110 of the housing 109 of the stator 107 to cover the jacket space. After being fed from 111 to the top of the peripheral surface 17 of the resin flange portion 12 of the stator 107, Since will flow down the peripheral surface 17 of the Nji portion 12, the circumferential surface 17 of the housing 109 and the resin flange 12 of the stator 107, it can be spread to enable refrigerant flow.
[0040]
Further, in the “cooling structure of the generator 1 of the present embodiment”, as shown in FIG. 1, an orifice 16 fitted to the refrigerant supply port 113 of the casing 102 is provided, and the jacket space 111, and thus the stator, is provided. Since the flow rate of the refrigerant sent to the peripheral surface 17 of the resin flange portion 12 of 107 can be adjusted, the refrigerant flows from the projecting edge portion 13 of the peripheral surface 17 of the resin flange portion 12 of the stator 107 via the orifice 16. Can be surely prevented from overflowing.
[0041]
In the “cooling structure of the generator 1 of the present embodiment”, the rotor 108 is rotated by a gas turbine engine, and the internal temperature of the stator 107 and the surface of the rotor 108 are increased by high-speed rotation of the rotor 108. Since the temperature tends to be extremely high, the above-described effects can be exerted greatly.
[0042]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the “cooling structure of the generator 1 of the present embodiment”, as shown in FIG. 5, there is a groove shape between different radiating fins 112 of the housing 109 of the stator 107. As shown in the figure, if a large space between the different heat dissipating fins 112 of the housing 109 of the stator 107 is provided, the effect of further suppressing an increase in the internal temperature of the stator 107 and the surface temperature of the rotor 108 during operation may be further exhibited. .
[0043]
Further, in the “cooling structure of the generator 1 of the present embodiment”, the rotor 108 is rotated by the gas turbine engine, but the internal temperature of the stator 107 with the coil 105 fixed by the resin 106, If the surface temperature of the rotor 108 inserted in the hollow portion of the stator 107 is to further suppress the temperature rise during operation, it is not necessary to limit the drive source of the rotor 108 to the gas turbine engine.
[0044]
In addition, the cooling structure of the rotating electrical machine of the present embodiment provided in the generator 1 can be provided not only in the generator but also in an electric motor or the like, and even in this case, the same effect can be obtained. .
[0045]
Further, in the “cooling structure of the generator 1 of the present embodiment”, as shown in FIG. 1, the jacket is formed via the refrigerant passage ports 14 at both end edges 110 of the housing 109 of the stator 107 (see FIG. 2). Although heat was radiated from the circumferential surface 17 of the resin flange portion 12 of the stator 107 to the refrigerant sent from the space 111 to the circumferential surface 17 of the resin flange portion 12 of the stator 107, for example, the jacket space 111 and Regardless of this, the refrigerant may be directly radiated to the peripheral surface 17 of the resin flange portion 12 of the stator 107, so that heat is radiated from the peripheral surface 17 of the resin flange portion 12 of the stator 107.
[0046]
Even in such a cooling structure of the generator 1, heat is radiated from the peripheral surface 17 of the resin flange portion 12 of the stator 107 by cooling the peripheral surface 17 of the resin flange portion 12 of the stator 107. Inside 12, the heat is transferred from the coil 105 to the peripheral surface 17 by heat conduction or the like. In this regard, as described above, the bent portion 11 of the coil 105 exists inside the resin flange portion 12 of the stator 107, the conductors of the coil 105 are densely packed, and further, the conductor of the coil 105 (for example, Since the thermal conductivity of a copper wire or the like is generally high, a large amount of heat inside the stator 107 moves to the peripheral surface via the coil 105. Accordingly, along with this, a large amount of heat is transferred from the surface of the rotor 108 to the stator by heat transfer or the like between the stator 107 and the rotor 108.
[0047]
Therefore, even in such a cooling structure of the generator 1, heat is radiated from the peripheral surface 17 of the resin flange portion 12 of the stator 107 by cooling the peripheral surface 17 of the resin flange portion 12 of the stator 107. As described above, inside the resin flange portion 13 of the stator 107, a large amount of heat inside the stator 107 moves to the peripheral surface 17 via the coil 105, and accordingly, between the stator 107 and the rotor 108. However, since a large amount of heat is transferred from the surface of the rotor 108 to the stator 107, the internal temperature of the stator 107 in which the coil 105 is fixed with the resin 106, and the surface temperature of the rotor 108 inserted in the hollow portion of the stator 107. As for, the temperature rise during operation can be further suppressed.
[0048]
【The invention's effect】
In the cooling structure of the rotating electric machine of the present invention, heat is dissipated from the peripheral surface of the resin flange portion of the stator by cooling the peripheral surface of the resin flange portion of the stator. A large amount of heat inside the stator moves to the peripheral surface via the coil. Along with this, a large amount of heat also moves between the stator and the rotor from the rotor surface to the stator, so the coil is fixed with resin. With respect to the internal temperature of the stator and the surface temperature of the rotor inserted in the hollow portion of the stator, a temperature increase during operation can be further suppressed.
[0049]
In the rotating electrical machine cooling structure of the present invention, a large number of radiating fins interposed in the jacket space and the radiating fins are provided around the refrigerant sent to the jacket space via the refrigerant supply port of the casing. In addition to that, heat is released from the stator housing, and in addition to the refrigerant sent from the jacket space to the peripheral surface of the resin flange portion of the stator through the refrigerant passage ports at both ends of the stator housing, Heat is dissipated from the peripheral surface of the resin flange portion of the stator.In this respect, inside the resin flange portion of the stator, a large amount of heat inside the stator moves to the peripheral surface via the coil. Even between the stator and the rotor, a large amount of heat is transferred from the rotor surface to the stator. That the surface temperature of the rotor interposed in the hollow portion of the stator can be suppressed more the rise in temperature during operation.
[0050]
Further, in the rotating electrical machine cooling structure of the present invention, comprising a refrigerant passage in which the gaps of the respective radiating fins of the stator housing are arranged in a row, on a straight line connecting the refrigerant passage ports at both ends of the stator housing, By arranging the refrigerant passages in a row, a flow toward the refrigerant passage port along the refrigerant passage can be formed for the refrigerant sent into the jacket space, so that the peripheral surface of the resin flange portion of the stator from the jacket space It is possible to smoothly feed the refrigerant into the tank.
[0051]
Further, at this time, if the refrigerant passage of the stator is provided at the topmost portion of the housing of the stator, and the refrigerant supply port of the casing is provided at the bottom surface portion of the casing, it is fed into the jacket space via the refrigerant supply port of the casing. The refrigerant first flows from the lowest part of the jacket space to the highest part, and then flows along a refrigerant passage provided at the highest part of the stator housing. Next, the refrigerant passes through the refrigerant passage ports at both end edges of the stator housing. Through the outer space of the resin flange portion of the stator from the jacket space, and then flows down the peripheral surface of the resin flange portion of the stator. The flowing refrigerant can be distributed effectively.
[0052]
Further, in the rotating electrical machine cooling structure according to the present invention, if an orifice attached to the refrigerant supply port of the casing is provided, the flow rate of the refrigerant fed into the jacket space and consequently the peripheral surface of the resin flange portion of the stator can be adjusted. Therefore, it is possible to reliably prevent the refrigerant from overflowing from the projecting edge portion of the peripheral surface of the resin flange portion of the stator via the orifice.
[0053]
Further, in the rotating electrical machine cooling structure of the present invention, if the rotor is rotated by a gas turbine engine, the internal temperature of the stator and the surface temperature of the rotor tend to be remarkably increased due to high-speed rotation of the rotor. The effect mentioned above can be exhibited greatly.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a generator having a cooling structure for a rotating electric machine according to the present invention.
FIG. 2 is a plan view of a stator of a generator having a rotating electrical machine cooling structure according to the present invention.
FIG. 3 is a cross-sectional view of a stator of a generator having a cooling structure for a rotating electric machine according to the present invention, showing temperature measurement points.
FIG. 4 is a table showing the results of temperature measurement during operation of a generator having a cooling structure for a rotating electrical machine according to the present invention.
FIG. 5 is a cross-sectional view showing heat dissipating fins of a stator housing in a generator having a cooling structure for a rotating electrical machine according to the present invention.
FIG. 6 is a cross-sectional view showing another example of the radiating fins of the stator housing in the generator having the cooling structure for the rotating electric machine according to the present invention.
FIG. 7 is a cross-sectional view of a generator having a cooling structure for a rotating electrical machine according to the prior art.
FIG. 8 is a cross-sectional view of a stator of a generator equipped with a cooling structure for a rotating electric machine according to the prior art and showing temperature measurement points.
FIG. 9 is a table showing a result of temperature measurement during operation in a generator having a cooling structure for a rotating electric machine according to the prior art.
[Explanation of symbols]
1 generator
11 Bent part of stator coil
12 Stator resin flange
13 Stud edge of resin flange of stator
14 Refrigerant passage port at both end portions of stator housing
15 Refrigerant passage of stator housing
16 Orifice
17 Peripheral surface of resin flange of stator
102 casing
103 Laminated silicon steel sheet for stator
104 Stator of laminated silicon steel sheet for stator
105 Stator coil
106 Stator resin
107 Stator
108 rotor
109 Stator housing
110 Ends of both edges of stator housing
111 Jacket space
112 Radiation fin of stator housing
113 Refrigerant supply port of casing
131 Casing refrigerant outlet

Claims (5)

A casing, a stator that is housed in the casing and that is interposed between the teeth of the laminated plate and fixed with resin, a rotor that is inserted in a hollow portion of the stator, and both edges of the stator housing A jacket space formed between the housing of the stator and the inner wall of the casing by close contact with the inner wall of the casing, and a plurality of radiating fins interposed in the jacket space and provided around the stator housing And a cooling structure for a rotating electric machine having a refrigerant supply port provided in the casing and communicated with the jacket space ,
The stator is
A resin flange portion formed by projecting from both edge ends of the housing by hardening the bent portion of the coil with the resin ;
A protruding edge portion provided around the resin flange portion ;
A groove formed on a peripheral surface of the resin flange portion by both edge ends of the housing and a protruding edge portion of the resin flange portion;
While being provided at both edge ends of the housing, the refrigerant passage port that communicates the jacket space and the peripheral surface of the resin flange portion,
The casing is
Comprising a refrigerant discharge port for discharging the refrigerant flowing down from the peripheral surface of the resin flange portion of the stator to the outside;
A cooling structure for a rotating electrical machine. A cooling structure for a rotating electrical machine according to claim 1 ,
The stator is
A refrigerant passage in which gaps between the heat radiating fins of the housing are arranged in a row,
The refrigerant passages are arranged on a straight line connecting the refrigerant passage ports ;
A cooling structure for a rotating electrical machine. A cooling structure for a rotating electrical machine according to claim 2,
A cooling structure for a rotating electric machine, wherein a cooling medium passage of the stator is provided at an uppermost part of a housing of the stator, and a cooling medium supply port of the casing is provided at a bottom part of the casing . A cooling structure of a rotating electric machine according to any one of claims 1 to 3,
A cooling structure for a rotating electric machine, comprising an orifice attached to a refrigerant supply port of the casing . A cooling structure of a rotating electric machine according to any one of claims 1 to 4,
A cooling structure for a rotating electrical machine, wherein the rotor is rotated by a gas turbine engine .

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