JP2021072714A - Rotary electric machine and rotary electric machine system - Google Patents

Abstract

To provide a rotary electric machine and a rotary electric machine system with a novel configuration in which cold air on the inflow side is actively flowed near the coil end of a stator on the outflow side to effectively cool the coil end.SOLUTION: A first axial ventilation duct 13 is provided that is continuous with a stator core 4 in the axial direction, and a second axial ventilation duct 11 is provided that is continuous with a rotor core 3 in the axial direction, the flow of air flowing through the second ventilation duct 11 is changed in the radial direction, a flow path changing duct 17a that allows all or part of the air flowing through the second ventilation duct 11 to flow toward a downstream coil end 16d is arranged on the downstream side of the rotor core 3. Therefore, the air on the inflow side having low temperature is positively flowed to the vicinity of a coil end 16d on the downstream side of a stator 4 through the second axial ventilation duct 11 to effectively cool the vicinity of the downstream coil end 16d including an end portion 4d on the downstream side of the stator core 4.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotary electric machine and a rotary electric machine system for a vehicle using the rotary electric machine.

For example, as a rotary electric machine driven by an internal combustion engine, a field winding type synchronous rotary electric machine in which a field coil is applied to a rotor is generally applied. This is because the power factor can be easily controlled by controlling the exciting current (direct current) that energizes the field coil. For this reason, it is also applied to vehicle systems such as railway vehicles and large dump trucks, but miniaturization and weight reduction are important as required specifications for mounting on vehicle systems.

In general, there is a trade-off between miniaturization and weight reduction and the efficiency of the rotary electric machine. Therefore, if the miniaturization and weight reduction are prioritized, the efficiency of the rotary electric machine will decrease. That is, it means that the loss increases, and the heat generation increases at the same time as the output increases. Therefore, it is necessary to improve the cooling performance in order to prioritize miniaturization and weight reduction to establish a rotary electric machine.

There are various cooling methods for rotary electric machines. For example, the axial flow open type cooling method is used as a rotary electric machine driven by an internal combustion engine. In this axial flow open type cooling system, a refrigerant, here, air is supplied from the front side of the rotary electric machine to cool the inside of the rotary electric machine, and high-heat air exchanged for heat is discharged from the rear side.

This method is characterized by its simple structure and high cooling performance among the cooling methods. As a blowing means for flowing air as a refrigerant, an electric blowing blower installed separately from the rotating electric machine and a self-cooling fan provided in the rotor are used.

Generally, the air flow in the open axial flow type flows in the axial direction of the rotary electric machine. Therefore, the temperature of the air is low on the inflow side in the axial direction of the rotary electric machine, and the temperature of the air is high on the outflow side in the axial direction because the heat of the rotary electric machine is taken away from the flow. Therefore, in the temperature distribution of the rotary electric machine adopting the axial flow open type cooling method, the temperature tends to increase along the direction in which the air flows out. As described above, since the temperature of the rotary electric machine is maximized on the outflow side of the air, it is necessary to positively cool the vicinity of the end of the rotary electric machine on the outflow side in the axial direction.

Various methods have been studied as methods for suppressing the temperature rise at the end in the axial direction in a rotary electric machine to which an axial flow open type cooling method is applied. As an example, for example, International Publication No. 99/38244 Those described in (Patent Document 1) are known.

In Patent Document 1, a radial ventilation duct that communicates an axial ventilation duct formed on the outer peripheral side of the stator core and inside the rotor in the axial direction and an air gap between the stator core and the rotor core. Is provided in the stator core portion and the rotor core portion, which correspond to the range of 40% downstream of the cooling air flowing through the air gap, to improve the cooling efficiency of the rotor while suppressing the deterioration of the characteristics of the rotor. It is stated that it can be done.

International Publication No. 99/38244

Patent Document 1 discloses a rotary electric machine capable of improving the cooling efficiency of the rotary electric machine while suppressing deterioration of the characteristics of the rotary electric machine. Further, in Patent Document 1, a radial ventilation duct is provided in the fixed iron core and the rotor core on the downstream side through which the cooling air flows, and the arrangement range of the radial ventilation duct is 40% of the axial gap length. It is a range. In this case, radial ventilation ducts are provided alternately with electromagnetic steel sheets in the axial direction near the ends of the fixed iron core and the rotor core of the rotary electric machine.

In Patent Document 1, the rotor is provided with an axial ventilation duct, and the ventilation passage penetrates the rotor. Therefore, a part of the inflowing air is discharged as it is in the axial direction, and the air having a low temperature is positively flowed to the axial end portion, which is insufficient in the sense of using the air for cooling. In addition, the condition that the temperature is reduced by cooling the vicinity of the end on the side where the air flowing through the rotary electric machine flows out by the radial ventilation duct is satisfied, but the part where the maximum temperature is generated (for example, the coil end on the rear side). It is insufficient from the viewpoint of positively cooling and leveling the temperature distribution.

Regarding this point, the relationship between the number of poles of the rotary electric machine and the coil end of the stator will be briefly described. For example, if the stator coil is a distributed winding and the outer diameter of the stator and the number of slots for each pole and phase (stator slot / number of poles / number of phases) are the same, the slots of the stator coil increase as the number of poles increases. The straddle between them becomes smaller. That is, as the straddle of the stator coil becomes smaller, the axial length of the coil end of the stator also becomes shorter.

As shown in FIGS. 15A and 15B, focusing on the cooling of the coil end 41 of the stator 40 on the side where air flows out, the outer peripheral surface of the stator core 44 forming the stator 40 and the frame 42 which is a case. A backside duct 43 through which air passes is provided between the inner peripheral surfaces of the above, and the stator 40 and the coil end 41 are cooled by the air passing through the backside duct 43.

That is, as shown in FIG. 15A, if the coil end 41 of the stator 40 is long in the axial direction, the coil end 41 is easily exposed to the air (Air) from the backside duct 43, so that the temperature in the vicinity of the coil end 41 is increased. Can be lowered. However, when the number of poles increases and the axial length of the coil end 41 becomes shorter, as shown in FIG. 15B, the coil end 41 of the stator 40 becomes shorter in the axial direction, and becomes the "wind back" of the stator core 44. Therefore, the cooling of the coil end 41 becomes insufficient.

As described above, the region where the maximum temperature of the rotary electric machine is reached on the outflow side of the air (Air) is likely to be in the vicinity of the coil end 41 including the downstream end portion of the stator 40. Therefore, a method of positively cooling the vicinity of the coil end 41 of the stator 40 is required.

In addition to this, in Patent Document 1, since the radial ventilation duct has a magnetic resistance in the axial direction of the rotary electric machine, the characteristics of the rotary electric machine are deteriorated as compared with the rotary electric machine without the radial ventilation duct. Become. In addition, since the magnetic resistance of the radial ventilation duct is asymmetric with respect to the axial direction of the rotating electric machine, an electromagnetic imbalance may occur, which also causes a secondary problem of vibration and noise. There is.

A main object of the present invention is a rotation provided with a novel configuration in which air having a low temperature on the inflow side is positively flowed near the coil end including the end of the stator on the outflow side to effectively cool the vicinity of the coil end. The purpose is to provide electric machines and rotary electric machines.

INDUSTRIAL APPLICABILITY The present invention is a rotary electric machine having a stator core and a rotor core provided inside the stator core via a gap and having a fixed rotation shaft, which is axially continuous on the outer peripheral side of the stator core. A first axial ventilation duct is provided, a second axial ventilation duct continuous in the axial direction is provided on the inner peripheral side of the rotor core, and the flow of air flowing out of the second ventilation duct is calibrated. A rotor that changes direction and allows all or part of the air flowing out of the second ventilation duct to flow toward the vicinity of the downstream coil end including the downstream end of the stator core when viewed from the air flow. A side flow path changing duct is provided at the downstream end of the rotor core.

According to the present invention, the air on the inflow side having a low temperature is positively flowed to the vicinity of the coil end on the downstream side of the stator through the second axial ventilation duct to push the end on the downstream side of the stator core. The vicinity of the downstream coil end including the coil end can be effectively cooled.

It is sectional drawing which shows the cross section in the axial direction of the rotary electric machine which becomes 1st Embodiment of this invention. FIG. 1 is an enlarged cross-sectional view of a main part of the rotary electric machine shown in FIG. 1 in a cross section in the radial direction AA orthogonal to the axial direction of the rotary electric machine. FIG. 5 is an enlarged cross-sectional view of a main part of the rotary electric machine shown in FIG. 1 in a cross section on a radial BB plane orthogonal to the axial direction of the rotary electric machine. It is explanatory drawing explaining the structure of the rotor side end duct shown in FIG. It is explanatory drawing explaining the structure of the stator side end duct shown in FIG. It is a comparative explanatory view which compared the temperature rise value of a coil end with the conventional. It is sectional drawing which shows the cross section in the axial direction of the rotary electric machine which becomes 2nd Embodiment of this invention. It is explanatory drawing explaining the flow of the air by 1st Embodiment. It is explanatory drawing explaining the flow of the air by 2nd Embodiment. It is sectional drawing which shows the cross section in the axial direction of the rotary electric machine which becomes the 3rd Embodiment of this invention. It is explanatory drawing which showed the relationship between the axial length of the flow path change duct of a rotor, and the temperature rise value of a coil end. FIG. 5 is an enlarged cross-sectional view of a main part showing a radial cross section of the stator-side end duct according to the fourth embodiment of the present invention. It is explanatory drawing which shows the shape of the baffle plate used for the stator side end duct. It is sectional drawing which shows the cross section in the axial direction of the rotary electric machine which becomes 5th Embodiment of this invention. It is sectional drawing which shows the cross section in the radial direction of the rotary electric machine which becomes 6th Embodiment of this invention. It is explanatory drawing explaining the shape of the core clamp of the rotor which becomes the 7th Embodiment of this invention. It is explanatory drawing explaining the shape of the core clamp of the stator which becomes the 7th Embodiment of this invention. It is a block diagram of the rotary electric machine system which becomes 8th Embodiment of this invention. It is explanatory drawing explaining the structure and the air flow near the coil end which has a long axial length in the conventional direction. It is explanatory drawing explaining the structure around the coil end which the conventional axial length is short, and the air flow.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments, and various modifications and applications are included in the technical concept of the present invention. Is also included in that range.

FIG. 1 is an axial sectional view of the rotary electric machine according to the first embodiment. Further, FIG. 2 is a cross section taken along the line AA of FIG. 1, and a part thereof is enlarged and shown. This rotary electric machine is a rotary electric machine mainly used by being connected to an internal combustion engine such as a diesel engine. For example, it is a rotary electric machine having an output of several KVA and a rotation speed of several thousand min-1, and is used as a vehicle power source for a large dump truck or a railroad vehicle.

In FIGS. 1 and 2, the rotary electric machine 100 has a rotor 1 and a stator 2 as main components, and specifically, a shaft to which the rotor core 3 and the rotor core 3 are fixed (referred to as a claim). Rotor shaft) 19, stator core 4 fixed to the frame 12 constituting the case, field coil 5 wound around the rotor core 3, stator coil 6 wound around the stator core 4, rotor A gap 7 formed between the iron core 3 and the stator core 4, a damper bar 8 provided between the field coils 5 of the rotor core 3 (see FIG. 2), and rotation provided in the field coil 5. It is composed of a child wedge 9 (see FIG. 2), a stator wedge 10 provided on the stator coil 6 (see FIG. 2), and the like. Since these configurations are well-known configurations, a special description thereof will be omitted.

In the stator core 4, an upstream coil end 16u is formed on the side where air flows in, and a downstream coil end 16d is formed on the side where air flows out. The "upstream side" and "downstream side" are based on the flow of air as a refrigerant as a relative reference, and the same applies to the following description.

A frame 12 that serves as a case for being fixed to the stator 2 is arranged on the outer peripheral side of the stator 2, and the fixing portions of the stator 2 and the frame 12 are fixed at predetermined intervals in the circumferential direction. Then, a backside duct (first axial ventilation according to claim) for flowing air as a refrigerant in the axial direction formed on the outer peripheral surface of the stator core 4 between the inner peripheral surface of the frame 12 is formed. A duct) 13 is provided. The backside duct 13 is arranged on the outer peripheral side of the stator coil 6.

Further, an axial duct (second axial ventilation duct according to claim) 11 for flowing air as a refrigerant in the axial direction is provided on the inner peripheral side of the rotor core 3. The axial duct 11 is arranged on the inner peripheral side of the field coil 5.

It should be noted that the radial ventilation duct extending in the radial direction as described in Patent Document 1 is not formed inside the fixed iron core or the rotor core. As a result, it is possible to prevent the radial ventilation duct from becoming a magnetic resistance and suppress the deterioration of the characteristics of the rotating electric machine, and the magnetic resistance of the radial ventilation duct is not asymmetric with respect to the axial direction of the rotating electric machine. Vibration and noise can be suppressed.

On both sides of the rotor core 3, an upstream core clamp (rotor) 15au and a downstream core clamp (rotor) 15ad are provided to sandwich and fix the rotor core 3 from both sides. These core clamps (rotor) 15au and 15ad are fixed to the shaft 19 to position and fix the shaft 19 and the rotor core 3.

The radial lengths of the core clamps 15 (rotor) au and 15ad are set to be longer than the axial duct 11 in the radial direction and before reaching the field coil 5. The upstream core clamp (rotor) 15au is formed with an opening connected to the axial duct 11.

On the other hand, the downstream core clamp (rotor) 15ad is not formed with an opening connected to the axial duct 11, or is formed with an opening capable of flowing a predetermined flow rate. In the rotor side end duct (rotor side flow path changing duct referred to in the claim) 17a, which will be described later, all or part of the air flowing in the axial direction from the axial duct 11 is directed toward the downstream side coil end 16d. It has a function of converting and flowing in the radial direction, and the rotor side end duct 17a is fixed by a downstream side core clamp (rotor) 15ad. Then, when the rotor side end duct 17a has an opening for allowing a part of the air to escape axially downstream, a part of the air is axially downstream from the opening formed in the downstream side core clamp (rotor) 15ad. It is also possible to escape.

As described above, the rotor side end duct 17a is sandwiched between the downstream end portion 3d and the downstream side core clamp (rotor) 15ad in the axial direction of the rotor core 3. This rotor side end duct 17a is a feature of this embodiment, which will be described later.

Further, on both sides of the stator core 4, an upstream core clamp (stator) 15 bu and a downstream core clamp (stator) 15 dd are provided to sandwich and fix the stator core 4 from both sides. These core clamps (stator) 15bu and 15bd are fixed to the inner circumference of the frame 12 to position and fix the frame 12 and the stator core 4. The core clamps (stator) 15bu and 15bd are formed with openings connected to the backside duct 13.

Similarly, between the downstream end 4d and the downstream core clamp (stator) 15bd in the axial direction of the stator core 4, the stator side end duct (stator side flow path changing duct) 17b Is sandwiched. Although the stator side end duct 17b is adopted in this embodiment, the stator side end duct 17b can be omitted if it is not necessary.

Next, the cooling of the rotary electric machine 100 will be described. The arrow shown in FIG. 1 indicates the flow of air (Air), and the flow path through which the air (Air) flows is a flow path branched from the inflow side to the backside duct 13, the gap 7, and the axial duct 11. is there.

The air (Air) flowing through the backside duct 13 does not branch in the radial direction as in Patent Document 1, but flows in the axial direction as it is, and iron loss mainly generated in the stator core 4 and generated in the stator coil 6 are generated. The heat based on the copper loss is taken away, and the temperature rise of the stator core 4 and the stator coil 6 is suppressed.

Further, the air (Air) flowing in the gap 7 flows in the axial direction as it is without branching in the radial direction, and the iron loss mainly generated in the stator core 4, the copper loss generated in the stator coil 6, and the boundary. The heat based on the copper loss generated in the magnetic coil 5 is taken away, and the temperature rise of the stator core 4, the stator coil 6 and the field coil 5 is suppressed.

In this way, the air (Air) flowing through the backside duct 13 and the gap 7 flows axially from the inflow side to the outflow side while taking heat and increasing the temperature. Therefore, since most of the heat generating source is the stator 2, the maximum temperature region is generated in the vicinity of the downstream end coil 16d including the downstream end 4d of the stator 2 on the outflow side of the air (Air). Therefore, cooling of this part is important.

On the other hand, since the air (Air) flowing through the axial duct 11 flows on the inner peripheral side of the field coil 5, the degree of temperature rise is smaller than that of the air (Air) flowing through the backside duct 13 and the gap 7. .. In other words, the temperature difference between the inflow side and the outflow side of the air (Air) flowing through the axial duct 11 tends to be smaller than the temperature difference of the air (Air) flowing through the backside duct 13 and the gap 7. That is, it can be seen that the cooling effect can be increased by using the air (Air) flowing through the axial duct 11.

The present embodiment positively utilizes the air (Air) flowing through the axial duct 11. That is, the air (Air) flowing through the axial duct 11 in the axial direction and having a small temperature rise is received by the downstream end duct 17a located at the downstream end 3d of the rotor core 3 in the axial direction, and is received by the rotor end duct 17a. By changing the flow direction in the radial direction using 17a and flowing the flow, the vicinity of the downstream coil end 16d including the downstream end 4d of the stator 2 is cooled.

Next, a configuration will be described in which the flow direction of the air (Air) flowing in the axial direction of the axial duct 11 is changed in the radial direction. FIG. 3 shows a cross section taken along the line BB of FIG. 1, and is an end duct 17a for changing the flow direction of the air (Air) flowing through the axial duct 11 in the radial direction toward the vicinity of the downstream coil end 16d. , 17b is shown. FIG. 4A shows the configuration of the rotor side end duct 17a, and FIG. 4B shows the configuration of the stator side end duct 17b.

As shown in FIG. 1, a rotor side end duct 17a is arranged between the downstream end 3d of the rotor core 3 and the downstream core clamp (rotor) 15ad, and the downstream side of the stator core 4 is located. The stator side end duct 17b is arranged between the end portion 4d of the above and the downstream side core clamp (rotor) 15bd. Here, the rotor side end duct 17a has a function of changing the direction of the flow of air (Air) flowing through the axial duct 11 in the radial direction.

As shown in FIGS. 3 and 4A, the rotor side end duct 17a is formed in substantially the same shape as the rotor core 3 when viewed from a plane orthogonal to the axial direction of the rotor core 3, and the rotor In cooperation with the surface of the end portion 3d on the downstream side of the iron core 3, a ventilation passage 17ap is formed in which the air flowing out of the axial duct 11 is changed in direction and flows in the radial direction.

As shown in FIG. 4A, the rotor side end duct 17a is provided with a flat air passage forming surface 17af, and a baffle plate 17ag extending radially in the radial direction is formed on the air passage forming surface 17af. The baffle plate 17ag is planted with a predetermined length in the axial direction. As a result, the above-mentioned ventilation passage 17ap can be formed. The baffle plate 17ag is in contact with the surface of the end 3d of the rotor core 3, and the surface opposite to the air passage forming surface 17af on which the baffle plate 17ag is formed is the downstream core clamp (rotor) 15ad. Is in contact with.

That is, the surface opposite to the surface on which the baffle plate 17ag is formed is strongly pressed in the axial direction by the downstream core clamp (rotor) 15ad and fixed to the shaft 19, so that the rotor core 3 A ventilation passage 17ap can be formed between the surface of the end portion 3d on the downstream side of the above and the air passage forming surface 17af of the rotor side end duct 17a.

In this way, the baffle plate 17ag has a function of forming the ventilation passage 17ap and transmitting the pressing force from the downstream core clamp (rotor) 15ad to the rotor core 3 to fix the rotor core 3. There is. The ventilation passage 17ap is formed by the baffle plate 17ag from the inner peripheral side of the axial duct 11 to the vicinity of the outer periphery of the rotor core 3.

Further, the baffle plate 17ag is arranged between the field coils 5, in other words, is arranged so as to sandwich the field coil 5, whereby air is surely brought into contact with the field coil 5 to be efficiently and efficiently. Can be cooled evenly. In the rotor side end duct 17a, a storage space 17ac in which the field coil 5 is housed is formed between adjacent baffle plates 17ag.

Further, the side of the fixed iron core 4 has substantially the same configuration. The stator-side end duct 17b is formed in substantially the same shape as the stator core 4 when viewed from a plane orthogonal to the axial direction of the stator core 4, and is formed at the downstream end portion 4d of the stator core 4. In cooperation with the surface, a ventilation passage 17bp is formed in which the air flowing through the ventilation passage 17ap of the rotor side end duct 17a flows in the radial direction.

As shown in FIG. 4B, the stator-side end duct 17b is provided with a flat air passage forming surface 17bf, and a baffle plate 17ag extending radially in the radial direction is formed on the air passage forming surface 17bf. The baffle plate 17 bg is planted with a predetermined length in the axial direction. As a result, the above-mentioned ventilation passage 17bp can be formed. The baffle plate 17bg is in contact with the surface of the end 4d of the stator core 4, and the surface opposite to the air passage forming surface 17bf on which the baffle plate 17bg is formed is the downstream core clamp (stator) 15bd. Is in contact with.

That is, the surface opposite to the surface on which the baffle plate 17bg is formed is strongly pressed in the axial direction by the downstream core clamp (stator) 15bd and fixed to the frame 12, whereby the stator core 4 A ventilation passage 17bp can be formed between the surface of the end portion 4d on the downstream side of the above and the air passage forming surface 17bf of the stator side end duct 17b.

In this way, the baffle plate 17bb has a function of forming the ventilation passage 17bp and transmitting the pressing force from the downstream core clamp (stator) 15bd to the stator core 3 to fix the stator core 4. There is. The ventilation passage 17bp is formed by a baffle plate 17bb extending radially in the radial direction from the inner peripheral side of the stator core 4 to the vicinity of the outer circumference of the stator core 4.

Further, the baffle plate 17bg is arranged between the stator coils 6, in other words, in a form of sandwiching the stator coil 6, whereby air is surely brought into contact with the stator coil 6 to be efficiently and efficiently. Can be cooled evenly. In the stator side end duct 17b, a storage space 17bc in which the stator coil 6 is housed is formed between adjacent baffle plates 17bg.

Here, as shown in FIG. 1, the air flowing through the ventilation passage 17bp cools the downstream end 4d of the stator core 4, partly flows to the downstream end coil 16d, and partly flows to the backside duct. It merges with the air flowing through 13. As a result, the vicinity of the downstream end coil 16d including the downstream end 4d of the stator core 4 can be cooled by the low temperature air flowing through the axial duct 11.

Returning to FIG. 1, the low-temperature air flowing in from the front side of the rotary electric machine 100 flows into the back side duct 13, the gap 7, and the axial duct 11 as shown by the black arrows, and the stator core 4 is fixed. The child coil 6, the rotor core 3, and the field coil 5 flow out to the outflow side while being cooled.

Then, in particular, when the air flowing out of the axial duct 11 reaches the rotor side end duct 17a, it collides with the rotor side end duct 17a and collides with the air passage forming surface 17af to change the flow direction outward in the radial direction. As shown in FIG. 3, the air from the axial duct 11 whose flow direction has been changed flows outward along the ventilation passage 17ap formed in the rotor side end duct 17a. The air flowing through the ventilation passage 17ap moves to the outer peripheral side of the rotor core 3 due to the pressure difference between the inflow side and the outflow side and the action of the centrifugal force of the rotor core 3.

A part of the air flowing out from the outer peripheral side of the rotor core 3 in the radial direction is taken away by the air passing through the gap 7, but the other air and a part of the air flowing through the gap 7 are of the fixed core 4. It flows into the ventilation passage 17bp of the stator-side end duct 17b provided at the end. The air flowing through the ventilation passage 17bp cools the downstream end 4d of the stator core 4, partly flows to the downstream coil end 16d, and partly joins the air flowing through the backside duct 13.

In this way, the air flowing through the axial duct 11 at a lower temperature than the air flowing through the backside duct 13 and the gap 7 is introduced into the ventilation passage 17bp of the stator side end duct 17b provided at the end portion 4d of the fixing iron core 4. By allowing the stator core 4 to flow in, the vicinity of the downstream coil end 16d including the downstream end portion 4d of the stator core 4 can be cooled.

The core clamps 15au, 15ad, 15bu, and 15bd described above also have a function of holding laminated electromagnetic steel sheets (rotor core, stator core). Therefore, it is desirable that the core clamps 15au, 15ad, 15bu, and 15bd are made of a material harder than iron or have a sufficient thickness in order to obtain high rigidity.

Further, since the core clamps 15au, 15ad, 15bu, 15bd, the rotor side end duct 17a, and the stator side end duct 17b are generally magnetic members, a loss due to eddy current occurs. In order to suppress the loss due to the eddy current, it is desirable to use a material having low conductivity such as stainless steel.

The rotary electric machine 100 described in the present embodiment has 10 poles and 90 slots for the stator 2, but the same effect can be obtained with other poles and slots. The type of the rotary electric machine 100 is a field winding type synchronous rotary electric machine, but the same effect can be obtained even if it is applied to an induction rotary electric machine or a permanent magnet type rotary electric machine to which a permanent magnet is applied. Further, although the winding method of the stator coil 6 is distributed winding, it goes without saying that other winding methods may be used.

Next, the comparison result of the temperature rise between the rotary electric machine of the present embodiment and the conventional rotary electric machine having no end duct will be described. The comparison result is shown in FIG. 5, and the vertical axis is the temperature rise value of the downstream coil end 16d, and the standardized value (p.u.) is set to 1.0, which is the temperature rise value of the conventional rotary electric machine. .. As can be seen from FIG. 5, it is possible to reduce the amount by about 0.1 point by providing the end duct. If the end 4d on the downstream side of the stator core 4, which is the maximum temperature of the stator 2, can be reduced by even 0.1 point, the effect is sufficient.

As described above, in the present embodiment, the stator core 4 is provided with the first axial ventilation duct (backside duct) 13 continuous in the axial direction, and the rotor core 4 is provided with the second shaft continuous in the axial direction. Along with providing a directional ventilation duct (axial duct) 11, the flow of air flowing through the second ventilation duct is changed in the radial direction, and all or part of the air flowing through the second ventilation duct can be seen by the air flow. A duct for changing the flow path on the rotor side, which flows toward the vicinity of the downstream coil end including the downstream end of the stator core, is provided on the downstream side of the rotor core.

According to this, the air on the inflow side having a low temperature is positively flowed to the vicinity of the coil end 16 on the downstream side of the stator 2 through the second axial ventilation duct 11, and the end on the downstream side of the stator core 4 is positively flowed. The vicinity of the downstream coil end 16 including the portion 4d can be effectively cooled.

Next, a second embodiment of the present invention will be described. What is different from the first embodiment is the shape of the downstream core clamp (stator) 15b arranged on the downstream side of the stator core 4. The configuration other than this is the same as the configuration shown in FIG.

As shown in FIG. 6, the axial thickness of the downstream core clamp (stator) 15bd2 gradually increases from the inner peripheral side to the outer peripheral side of the stator core 4. In this embodiment, in consideration of symmetry, the thickness of the upstream core clamp (stator) 15bu2 in the axial direction is gradually increased from the inner peripheral side to the outer peripheral side of the stator core 4.

FIG. 7A shows the radial air flow in the downstream core clamp (stator) 15bd of the first embodiment, and FIG. 7B shows the radial air flow in the downstream core clamp (stator) 15bd2 of the second embodiment. It shows the flow of air.

The air (Air) flowing in the radial direction from the rotor side end duct 17a has a flow path (Fr) flowing through the stator side end duct 17b and a flow path (Fr) flowing toward the downstream core clamp (stator) 15bd. It is branched to Fa). In the case of the first embodiment shown in FIG. 7A, the air (Air) is blocked by the surface perpendicular to the radial direction of the downstream core clamp (stator) 15db, and the air is blocked in the radial direction of the stator core 4. (Air) becomes difficult to flow.

On the other hand, in the case of the second embodiment shown in FIG. 7B, the downstream core clamp (stator) 15bd2 has a shape in which the thickness gradually increases from the inner peripheral side to the outer peripheral side. Compared to the embodiment shown, air (Air) tends to flow in the radial direction. As a result, the downstream coil end 16d is easily exposed to air (Air), so that the temperature rise of the downstream coil end 16d can be suppressed.

Next, a third embodiment of the present invention will be described. The difference from the second embodiment is the stator side end duct 17b arranged at the downstream end 4d of the stator core 4 and the rotor side end arranged at the downstream end 3d of the rotor core 3. The point is that the lengths of the ducts 17a in the axial direction are different. Other than this, the configuration is the same as that shown in FIG.

In FIG. 8, the axial length (Lr) of the baffle plate 17ag of the rotor side end duct 17a arranged at the downstream end 3d of the rotor core 3 is the downstream end of the stator core 4. It is set longer than the axial length (Ls) of the baffle plate 17bg of the stator side end duct 17b arranged in 4d.

As described in the second embodiment, the air (Air) flowing in the radial direction from the rotor side end duct 17a has a flow path flowing through the stator side end duct 17b and a downstream core clamp (stator). It is branched into a flow path that flows to the side of 15bd. Therefore, by making the axial length (Lr) of the rotor side end duct 17a longer than the axial length (Ls) of the stator side end duct 17b, the rotor side end duct 17a flows out. The opening area is increased, and the flow rate of air (Air) flowing through the downstream coil end 16d can be increased.

Here, the temperature reduction effect by the length ratio (Lr / Ls) of the axial length (Lr) of the rotor side end duct 17a and the axial length (Ls) of the stator side end duct 17b is shown. It is shown in 9.

The horizontal axis is the length ratio (Lr / Ls) of the axial length (Lr) of the rotor side end duct 17a to the axial length (Ls) of the stator side end duct 17b. The state where the length ratio (Lr / Ls) is "0" indicates that there is no downstream end duct 17a. The vertical axis shows the temperature rise value of the downstream coil end 16d, and is a normalized value (pu) in which the temperature rise value when the length ratio (Lr / Ls) is "0" is set to 1.0. It is said.

As shown in FIG. 9, as the length ratio (Lr / Ls) increases, the temperature rise value of the downstream coil end 16d decreases. It is considered that this is because the flow rate of the air (Air) flowing through the rotor side end duct 17a has increased and the flow rate flowing through the downstream coil end 16d has increased. Also in this embodiment, it is possible to effectively suppress the temperature rise of the downstream coil end 16d. The third embodiment is based on the second embodiment, but can be combined based on the first embodiment.

Next, a fourth embodiment of the present invention will be described. The difference from the first embodiment is that the tip shape on the inner peripheral side of the baffle plate 17bg of the stator side end duct 17b arranged at the downstream end portion 4d of the stator core 4 is different. Other than this, the configuration is the same as that shown in FIG.

As shown in FIGS. 10A and 10B, a tapered tip portion 17bdt is formed on the inner peripheral side of the baffle plate 17bg. By forming such a tip portion 17bdt, it is possible to reduce the pressure loss on the inflow surface of the air (Air) flowing from the rotor side end duct 17a side. As a result, the flow rate of air (Air) passing through the ventilation passage 17bp of the stator side end duct 17b can be increased, and the temperature rise of the downstream coil end 16d including the downstream end portion 4d of the stator core 4 is effective. Can be suppressed.

Next, a fifth embodiment of the present invention will be described. The difference from the first embodiment is that the axial length of the rotor core 3 is longer than the axial length of the stator core 4, and that the rotor core 3 is provided with two end ducts. Other than this, the configuration is the same as that shown in FIG.

As shown in FIG. 11, at the downstream end 3d of the rotor core 3, along the air flow, the rotor side first end duct 17a-1, the intermediate rotor core 3c, and the rotor side The second end duct 17a-2 and the downstream core clamp (rotor) 15ad are arranged in this order. The rotor side first end duct 17a-1 and the rotor side second end duct 17a-2 have the same shape, and the intermediate rotor core 3c also has the same shape as the rotor core 3. .. In the present embodiment, the axial length (RtL) of the rotor core 3 is set longer than the axial length (StL) of the stator core 4, and is determined by the relationship of "StL <RtL".

Then, the air (Air) flowing from the axial duct 11 is sent from the rotor side first end duct 17a-1 and the rotor side second end duct 17a-2 to the stator side end duct on the stator core 4 side. It will flow out to 17b.

As a result, a large amount of air can be supplied to the stator side end duct 17b on the stator core 4 side, and the temperature rise of the downstream coil end 16d including the downstream end 4d of the stator core 4 is effectively suppressed. can do. In particular, the downstream coil end 16d can be intensively cooled from the rotor side second end duct 17a-2.

Next, a sixth embodiment of the present invention will be described. The difference from the first embodiment is that the axial duct 11 formed in the rotor core 3 is formed around the shaft 19. Other than this, the configuration is the same as that shown in FIG.

As shown in FIG. 12, an axial duct 11 provided on the rotor core 3 is formed in an annular shape around the shaft 19, and a connecting bar 20 is provided in the circumferential direction between the shaft 19 and the inner peripheral surface of the rotor core 3. The shaft 19 and the rotor core 3 are connected and fixed in a radial pattern. With this configuration, the position of the axial duct 11 in the radial direction can be formed closer to the center of rotation of the shaft 19 as compared with the configuration in which the axial duct 11 is directly provided on the rotor core 3.

The air (Air) flowing in the radial direction from the axial duct 11 to the end duct 17a also takes into account the effect of fan action due to the rotation of the rotor core 3. This fan action is expressed as pressure, and the pressure due to this fan action is given by the following equation (1).
P = (V ₁ ^2- V ₂ ² ) / 2 …… (1)
Here, P is the pressure, V ₁ is the peripheral speed on the outer peripheral side of the _{rotor core, and V 2} is the peripheral speed on the inner peripheral side of the rotor core.

As shown in Eq. (1), it means that the pressure increases as the difference between the peripheral speeds of the inner circumference and the outer circumference of the rotor core 3 increases. That is, the peripheral speed of the rotor core 3 on the inner peripheral side is determined by the position of the axial duct 11 in the radial direction.

As described above, according to the present embodiment, since the axial position of the axial duct 11 can be arranged close to the rotation center of the shaft 19, the pressure P for facilitating the flow of air (Air) can be increased. ..

As a result, the flow rate of air (Air) flowing in the radial direction of the rotor side end duct 17a can be increased, so that a large amount of air can be supplied to the stator side end duct 17b on the stator core 4 side and fixed. The temperature rise of the downstream coil end 16d including the downstream end 4d of the core 4 can be effectively suppressed.

Next, a seventh embodiment of the present invention will be described. The difference from the first embodiment is that the shape of the core clamp for fixing the rotor core 3 and the stator core 4 is similar to that of the rotor core 3 and the stator core 4. Other than this, the configuration is the same as that shown in FIG.

FIG. 13A is an enlarged view of the main part of the downstream core clamp (rotor) 15ad viewed from the axial direction of the rotor core 3. The downstream core clamp (rotor) 15ad is made to have the same shape as or substantially similar to the shape seen in the axial direction of the rotor core 3, and does not interfere with the field coil 5, so that the coil storage space It is formed in a comb-teeth shape in which 15adc is formed.

FIG. 13B is an enlarged view of the main part of the downstream core clamp (stator) 15db viewed in the axial direction of the stator core 4. The downstream core clamp (stator) 15b is also made to have the same shape as or substantially similar to the shape seen in the axial direction of the stator core 4, and it does not interfere with the stator coil 6, so that the coil storage space It is formed in the shape of a comb with 15 bdc formed.

As described above, one of the functions of the downstream core clamps 15ad and 15bd is the lamination that forms the rotor core 3 and the stator core 4 via the rotor side end duct 17a and the stator side end duct 17b. This is to hold and fix the electromagnetic steel plate.

Therefore, when the downstream core clamps 15ad and 15bd are formed in the same shape as or substantially similar to the rotor core 3 and the stator core 4, the ends 3d and 4d of the rotor core 3 and the stator core 4 are formed. It becomes easy to apply the surface pressure uniformly, and the rigidity of the rotor core 3 and the stator core 4 can be further improved.

Next, an eighth embodiment of the present invention will be described. The eighth embodiment is a development of the above-mentioned rotary electric machine in an actual system.

As shown in FIG. 14, the rotary electric machines of the first to seventh embodiments are used as the main rotary electric machine 100a. An auxiliary rotary electric machine 100b is connected to the shaft 19 of the main rotary electric machine 100a. Further, the shaft 19 is directly connected to the internal combustion engine 200 via the coupling 21.

By driving the internal combustion engine 200, electric power is supplied from the main rotary electric machine 100a and the auxiliary rotary electric machine 100b to the power converters 201a and 201b. The power converter 201a supplies electric power to the electric motor 300 for driving the dump truck. The drive motor can rotate the drive wheels to drive the dump truck. On the other hand, the power converter 201b can rotate the blower blower 301 to supply air (Air) for cooling the main rotary electric machine 100a and the auxiliary rotary electric machine 100b.

Here, the above description has described an example of a generator as a rotary electric machine, but it can also be used as a rotary electric machine for an electric motor, and further, a rotary electric machine having a power generation function and an electric function such as an electric vehicle. Can be used.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... rotor, 2 ... stator, 3 ... rotor core, 4 ... stator core, 5 ... field coil, 6 ... stator coil, 7 ... gap, 8 ... damper bar, 9 ... rotor wedge, 10 ... Stator wedge, 11 ... Axial duct, 12 ... Frame, 13 ... Backside duct, 14 ... Coolant (air), 15au ... Upstream core clamp (rotor), 15ad ... Downstream core clamp (rotor), 15bu ... upstream core clamp (stator), 15bd ... downstream core clamp (stator), 16d ... downstream coil end, 17a ... rotor side end duct, 17b ... stator side end duct, 19 ... shaft, 20 ... Connecting bar, 21 ... Coupling.

Claims (13)

In a rotary electric machine having a stator core and a rotor core provided inside the stator core via a gap and having a fixed rotation shaft.
A first axial ventilation duct continuous in the axial direction is provided on the outer peripheral side of the stator core, and a second axial ventilation duct continuous in the axial direction is provided on the inner peripheral side of the rotor core. With
The flow of air flowing out of the second axial ventilation duct is changed in the radial direction, and all or part of the air flowing out of the second axial ventilation duct is viewed from the air flow of the stator core. A rotary electric machine characterized in that a rotor side flow path changing duct for flowing toward the vicinity of a downstream coil end including a downstream end is provided at a downstream end of the rotor core. In the rotary electric machine according to claim 1,
A stator-side flow path changing duct for flowing air from the rotor-side flow path changing duct in the radial direction is arranged at the downstream end of the stator core when viewed from the air flow.
A core clamp (stator) for pressing the stator-side flow path changing duct against the downstream end of the stator core is provided on the downstream side of the stator-side flow path changing duct, and the core clamp (fixing) is provided. A rotary electric machine characterized in that the axial thickness of the stator core is thinner on the inner diameter side than on the outer diameter side of the stator core. In the rotary electric machine according to claim 2,
A rotary electric machine characterized in that the axial length of the rotor-side flow path changing duct is formed longer than the axial length of the stator-side flow path changing duct. In the rotary electric machine according to claim 2,
The stator-side flow path changing duct is formed with a plurality of baffle plates extending from the inner peripheral side to the outer peripheral side in the radial direction.
A rotary electric machine characterized in that the tip end side of the inner peripheral side of the baffle plate is formed in a tapered shape. In the rotary electric machine according to any one of claims 2 to 4.
A rotary electric machine characterized in that an intermediate fixed iron core is provided downstream of the rotor side flow path changing duct, and a second rotor side flow path changing duct is further provided downstream thereof. In the rotary electric machine according to any one of claims 1 to 5.
An annular duct for changing the flow path on the rotor side is formed between the inner circumference of the rotor core and the rotating shaft.
A rotary electric machine characterized in that the inner circumference of the rotary shaft and the rotary shaft are fixed by connecting bars arranged radially. In the rotary electric machine according to claim 2,
The radial shape of the core clamp (rotor) is formed to be the same as or substantially similar to the radial shape of the rotor core, and the radial shape of the core clamp (stator) is the same. A rotary electric machine characterized in that the shape is the same as or substantially similar to the radial shape of the stator core. In the rotary electric machine according to claim 7,
A plurality of baffle plates (rotors) extending in the radial direction of the rotor core are formed in the rotor side flow path changing duct, and a ventilation path is formed between the adjacent baffle plates (rotors). A rotating electric machine characterized in that (rotor) is formed. In the rotary electric machine according to claim 8,
A rotary electric machine characterized in that a field coil is arranged in the ventilation path (rotor) formed between the adjacent baffle plates (rotor). In the rotary electric machine according to claim 8,
At the downstream end of the stator core, air flowing from the rotor side flow path changing duct flows toward the vicinity of the downstream coil end including the downstream end of the stator core. A rotary electric machine characterized in that the stator side flow path changing duct is provided. In the rotary electric machine according to claim 10,
A plurality of baffle plates (stator) extending in the radial direction of the stator core are formed in the stator side flow path changing duct, and a ventilation path is formed between the baffle plates (stator) adjacent to each other. A rotary electric machine characterized in that a (stator) is formed. In the rotary electric machine according to claim 9,
A rotary electric machine characterized in that a stator coil is arranged in the ventilation path (stator) formed between the adjacent baffle plates (stator). A main rotary electric machine driven by an internal combustion engine and an auxiliary rotary electric machine are provided, and an electric motor for driving a drive wheel of a vehicle is operated by the electric power of the main rotary electric machine, and the main rotary electric machine and the auxiliary rotary electric machine are operated by the electric power of the auxiliary rotary electric machine. In a rotary electric machine system that operates a blower blower that cools the auxiliary rotary electric machine
A rotary electric machine system, wherein at least the main rotary electric machine is composed of the rotary electric machine according to any one of claims 1 to 12.

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