JPH07184351A - Rotating electric machine - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a cooling structure and a machine comfort structure for a rotating electric machine, and an object thereof is to improve cooling capacity and mechanical strength. [Structure] In a drip-proof type rotary electric machine, an exhaust port 8 provided in a housing 4 is provided in a horizontal direction. Housing 4
Reinforcing ribs were provided around the exhaust port 8 provided in the. An exhaust port 8 is provided in the housing 4 of the axial flow type rotary electric machine. The projection 9c is provided on the end bracket 9 that also serves as a fan guide.
The thick portion 4 is formed on the housing 4 facing the stator flat portion 1c.
c is provided. A protrusion 4d capable of forming a plane is provided on the upper part of the rotating electric machine. [Effect] By improving the cooling effect, it is possible to reduce the size and weight of the rotating electric machine. Vibration noise can be reduced by preventing deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical structure and a cooling structure of a rotary electric machine such as an electric motor and a generator, and particularly to a frame structure suitable for loading other devices and preventing frame deformation, and a heat dissipation capability. An improved cooling structure is provided.

[0002]

2. Description of the Related Art The structure of a rotary electric machine, for example, a three-phase induction motor will be described with reference to FIG. The structure is roughly divided into the following. A stator 1 incorporating a winding for generating a driving force by a rotating magnetic field, and a rotor 2 arranged inside the stator 1 and rotationally driven by the rotating magnetic field
And the rotary shaft 5 fixed to the rotor 2, the rotary shaft 5
Bearings 3a, 3b for rotatably supporting the rotor 1, a stator 1, a housing 4 surrounding the rotor 2 and supporting the stator 1, and end brackets 9a, 9b for supporting the rotor bearings 3a, 3b on the housing 4. Then, it is fixed to the housing 4 and is provided with a foot portion FT which supports the whole and constitutes a mounting portion of the electric motor.

When the rotary electric machine is driven and operated, heat is generated from the stator 1, the rotor 2, and the rotor bearing portions 3a and 3b, which raises the temperature of the entire machine.
Therefore, the usable temperature of the machine is limited in order to maintain the performance of the material that constitutes the rotary electric machine and maintain the performance of the machine.

Therefore, various rotary electric machines have been devised in various ways so that the heat generated inside the machine can be radiated more efficiently. First, in the illustrated drip-proof protection type motor, the intake ports 7 are attached to the end brackets 9a and 9b.
a and 7b are provided, and the exhaust port 8 is provided on the lower side of the housing 4.
a and 8b are provided. A plurality of blades 2a and 2b extending in the axial direction are provided at both ends of the rotor 2.

As a result, when the electric motor is driven and the rotor 2 rotates, the cooling air is tangentially pressurized by the action of the blades 2a and 2b, as shown by arrows K to R in FIG. 13 (b). As shown by arrows A, B, ..., J, a cooling method is adopted in which external air is introduced into the machine from the intake ports 7a, 7b and directly cools each part that generates heat and discharges the air from the exhaust ports 8a, 8b. Has been. Here, 6a and 6b are fan guides for guiding air through the routes A, J, and J, and
Symbols a and 1b are coil ends of coils incorporated in the stator 1.

FIG. 14 shows another method in which one end bracket 9a is provided with an intake port 7a and the other end bracket 9b is provided with an exhaust port 8c. Then, a gap 4a is provided between the stator 2 and the housing 4. At this time, the fan guide 6a is provided on only one side. Then, when the electric motor is driven to rotate, the external air guides the air from the intake port 7a as shown by arrows A to K, and causes the air to flow through the gap 4a between the stator 1 and the housing 4 and discharges the air from the exhaust port 8c. Some have adopted a cooling method.

Here, the structure of drip-proof protection of the rotary electric machine will be described with reference to FIG. (A) is a cut side view, (b) is an enlarged view of a1 part, (c) is an enlarged view of a2 part. In the enlarged views of (a) and (b), the drip-proof protection structure means that when the angle c1 and the angle c2 are 15 degrees with respect to the vertical line b, the water droplets drop at this angle as indicated by arrows d1 and d2. Assuming that they come, the water droplets do not directly enter the inside of the housing 4 through the exhaust port 8 and have a diameter of 12 through the exhaust port 8.
It is a protective structure in which the test finger of [mm] does not enter inside. In FIG. 15, since the arrow d1 directly enters the inside of the housing 4 at the portion a1, in the case of the drip-proof type rotary electric machine, the exhaust port 8 having the shape shown in this figure is not provided at the portion a1. On the other hand, since the arrow d2 does not directly enter the inside of the housing 4 at the portion a2, the exhaust port 8 at this portion has no problem for the drip-proof type rotary electric machine.

[0008]

In a conventional drip-proof protection type rotary electric machine (hereinafter referred to as "rotary electric machine"), as shown in FIG.
The exhaust ports 8a and 8b were provided in the housing 4 as shown in FIG. To improve the cooling capacity, exhaust ports 8a, 8b
However, if the exhaust ports 8a and 8b are made larger, the strength of the housing 4 is reduced, and the drip-proof protection structure cannot be maintained.

In the axial flow type drip-proof protection type rotary electric machine shown in FIG. 14, the flow of the cooling air is the anti-load side intake port 7
The exhaust port 8c, which is sucked from a, passes through the ventilation path 4a between the stator 1 and the housing 4, and is provided on the load side bracket 9b.
Two flows, a main cooling air that is exhausted more and a sub-cooling air that is sucked from the inner peripheral portion of the load side bracket 9b and cools the stator coil 1b, and then is exhausted together with the main cooling air from the load side bracket exhaust port 8c. is there. In this cooling structure, the exhaust port 8c of the load side bracket 9b also serves as an intake port and an exhaust port for the sub-cooling air in addition to the exhaust port for the main cooling air, so that the air flow interferes and the cooling capacity decreases. There was a problem.

FIG. 41 shows a conventional stator 1 for a rotary electric machine.
3 shows a cross section of the fitting part of the housing 4. The stator 1 is formed by stacking electric iron plates, but in order to reduce the cost of iron core material, a cut surface 1c as shown in the figure is provided in the surrounding 2 to 4 directions. This cut surface 1c is
There is a problem that the stator 1 and the housing 4 are deformed into a non-circular shape, and the gap between the stator 1 and the rotor 2 is eccentric, which causes vibration and noise of the rotating electric machine.

Further, since a general rotating electric machine adopts a structure as shown in FIG. 13, when it is transported or when another device is placed on the upper part, the packing material is configured to withstand the stacking strength. Or, another device was loaded on the upper part of the rotating electric machine by using the intermediate seat.

Further, when the open type rotary electric machine as shown in FIG. 13 and FIG. 14 is miniaturized, it is general that the heat radiation area is insufficient.

An object of the present invention is to provide a rotary electric machine capable of improving the cooling capacity while preventing the deterioration of the strength of the housing due to the exhaust port and ensuring the drip-proof structure.

Another object of the present invention is to reduce the interference between the main cooling air and the auxiliary cooling air and to obtain a rotary electric machine having a good cooling structure.

Still another object of the present invention is to obtain a rotary electric machine using a bracket that also serves as a fan guide and having a structure that satisfies the drip-proof structure and drip-proof protection.

Still another object of the present invention is to provide a rotating electric machine which has less vibration and noise by mitigating non-circular deformation when the stator and the housing are fitted even if the stator cut surface is present.

Still another object of the present invention is to obtain a rotary electric machine capable of loading equipment on the upper part without reinforcing the packing material and without an intermediate seat.

Still another object of the present invention is to provide a rotary electric machine having an enlarged heat dissipation area and a good drip-proof structure by providing external fins around the intake port and the exhaust port.

[0019]

To achieve the above object, a feature of the present invention resides in that the direction of the exhaust port provided in the housing is horizontal.

Another feature of the present invention is that the exhaust ports provided in the housing are arranged so as to be distributed in the axial direction.

Another feature of the present invention is that
In a rotary electric machine that passes cooling air between the stator and the housing in the axial direction, an exhaust port is provided in the outer peripheral portion of the frame on the exhaust side. Further, the fan guide is provided on the end face of the stator on the exhaust port side, and the exhaust port is provided on the outer peripheral portion of the frame on the exhaust side.

Furthermore, another feature of the present invention is that
There is a drip-proof projection and rib on the bracket that also serves as a fan guide.

Still another feature of the present invention is that the thickness of the housing in the portion facing the flat portion of the stator is increased. Another reason is that the corners of the flat portion of the stator are rounded.

Still another feature of the present invention is that the upper portion of the rotating electric machine is provided with a protrusion so that the upper surface is flat.

Another feature of the present invention is that external fins are provided at the intake port and the exhaust port.

[0026]

[Operation] In order to improve the cooling performance of the rotating electric machine,
Increasing the cooling air and increasing the cooling area are major factors.

According to the above structure, since the shape of the exhaust port of the housing is arranged in the horizontal direction, the heat radiation surface can be increased and the cooling area can be increased as compared with the conventional radial exhaust port. Therefore, the cooling performance can be improved.

Further, when the exhaust port is provided in the horizontal direction, it is difficult for water droplets to enter the inside of the rotating electric machine, and it is possible to widen the opening width of the exhaust port or install the exhaust port on the upper side surface of the frame to exhaust the cooling air. The area can be increased and the cooling performance can be further improved. An increase in the exhaust area means a reduction in ventilation resistance, and even a cooling system using the same cooling fan can increase the amount of cooling air. That is, it is possible to obtain a rotary electric device having an improved cooling capacity by increasing the cooling air volume and the cooling area.

If the exhaust ports provided in the housing are formed so as to be distributed in the axial direction, the strength-reduced portions due to the exhaust ports do not overlap on the same plane, so that the strength of the entire housing can be improved. In the exhaust port provided in the housing, the thick wall portion (reinforcing rib) provided around the exhaust port shares the stress, and the strength reduction of the housing due to the provision of the exhaust port is compensated.

Further, by providing the exhaust port in the housing of the axial cooling type rotary electric machine, the cooling air sucked from the anti-load side bracket and cooling the rotor and the stator is changed to the cooling air sucked from the load side bracket. It is exhausted from the exhaust port without interference. As a result, the ventilation resistance of the cooling air sucked from the anti-load side bracket can be reduced, the flow rate is increased, and the cooling capacity is improved. Also, by providing a fan guide near the stator load side coil end as well, the intake / exhaust pressure difference between the blades on the rotor load side increases, and fan efficiency increases, so cooling air from the load side increases. The cooling capacity can be further improved.

Furthermore, due to the projection provided on the bracket that also serves as the fan guide, the water drop which is about to enter at an angle of 15 degrees from the vertical is prevented from entering at the projection.

Further, by providing the housing 4 with the thick portion, the cross-sectional area is increased, the tensile force at that portion is reduced, and the deformation of the housing is reduced.

Furthermore, by rounding the flat portion of the stator, the tensile stress on the housing is reduced and the deformation of the housing 4 is reduced.

Furthermore, the projection provided on the upper portion of the rotating electric machine can form a flat surface on the upper surface of the rotating electric machine, and by utilizing this surface, the rotating electric machines can be stacked. Also,
By using the same surface, it becomes easy to fix the accessory device to the upper part of the rotating electric machine.

Furthermore, by providing the outer fins around the exhaust port, the cooling air can be reused and the drip-proof structure can be strengthened.

[0036]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a diagram showing a first embodiment of the present invention, in which the present invention is applied to the protection type induction motor shown in FIG. Reference numeral 1 denotes a stator incorporating a winding for generating a driving force by a rotating magnetic field, 2 a rotor arranged inside the stator 1 and rotationally driven by the rotating magnetic field, 5 a rotary shaft fixed by shrink fitting to the rotor 2, Reference numerals 3a and 3b denote rotor bearing portions that rotatably support the rotating shaft. Reference numeral 4 denotes a housing that surrounds the stator 1 and the rotor 2 and supports the stator 1. The stator 1 is press-fitted into the housing 4. 9
Reference numerals a and 9b denote end brackets that support the rotor bearing portions 3a and 3b on the housing 4, and FT is a foot portion that fixes the rotor bearing portions 3a and 3b to the housing 4 and supports the whole. Reference numerals 7a and 7b are intake ports provided on the end brackets 9a and 9b, 8a and 8b are exhaust ports provided on the lower side of the housing 4, and 2a and 2b are blades provided at both ends of the rotor 2 extending in the axial direction. is there.

Here, the difference from the conventional structure is that the exhaust holes 8a, 8b provided on the lower side of the housing 4 are pierced in the radial direction with respect to the center of the rotary shaft 5 in the related art. On the other hand, according to this embodiment, the holes are drilled in the horizontal direction, that is, in the direction parallel to the mounting surface. The housing 4 can be formed by casting or die casting, but in the case of the embodiment, the housing 4 is formed by aluminum die casting.

By thus providing the exhaust ports 8a and 8b in the housing 4 in the horizontal direction, the cooling performance of the drip-proof type rotary electric machine is improved. That is, it is possible to increase the heat radiation area of the exhaust ports 8a and 8b that are most effective for cooling. In the enlarged view of part a of FIG. 2B, in the case of the exhaust port 8 provided in the horizontal direction rather than the exhaust port (broken line) c provided in the radial direction, the heat dissipation area is increased by the amount of the heat dissipation surface f (comparison). Due to the circle d, the heat radiation area of the exhaust port portion of the radial exhaust port (broken line) c is equal to the area of the heat radiation surface e in the horizontal direction).

Further, in rotating electricity, the amount of heat once transferred to the housing 4 is radiated into the air.
Since the streamlines sent from the blades 2a and 2b provided on the rotor 2 are provided so that the streamlines are bent at the exhaust ports 8a and 8b of part b in FIG. 2, turbulence occurs here, which causes The transfer of heat to the housing 4 is promoted. On the other hand, the blades 2a, 2b provided on the rotor 2 like the part a
At the exhaust ports 8a and 8b having a shape that is substantially parallel to the flow from, the amount of airflow is increased, so that the amount of air blown is increased and the cooling capacity is improved. When the rotation of the electric motor is opposite to the arrow in FIG. 2, the flow is reversed, and therefore the relationship is the same for the parts a and b, but the effect is the same.

In FIG. 2, exhaust ports 8a and 8b are not provided in the upper part of the housing 4. Therefore, the pressure in the upper part of the housing 4 becomes high. Exhaust ports 8a, 8b
From part b of, due to the pressure difference with the outside due to this pressure,
The rate at which the cooling air is discharged is high, and effective ventilation is obtained. On the other hand, the pressure of the lower portion of the housing 4 decreases due to the discharge of the cooling air from the b portions of the exhaust ports 8a and 8b.
Since the exhaust ports 8a, 8b of the portion are shaped along the streamlines generated by the action of the blades 2a, 2b, the ventilation resistance is small and the air flow rate is increased. Therefore, when viewed as a whole, the cooling air sucked from the intake ports 7a and 7b by the blades 2a and 2b is effectively discharged from the exhaust ports 8a and 8b, and the cooling efficiency is improved as compared with the conventional case.

Further, since the heated air discharged from the exhaust ports 8a and 8b of the housing 4 is discharged in parallel with the surface on which the motor is installed, the heated air is discharged in the radial direction more than in the conventional case. The amount of contact with the foot FT and the housing 4 is significantly reduced, and the amount of reheating the foot FT and the housing 4 with the heated air that has been once cooled is small.
When exhausted in the conventional radial direction, high-temperature air often stays near the foot portion FT, and even if the heat generated by the electric motor is cooled by air, the foot portion FT and the housing 4 are heated by the cooled heated air. The heat is transmitted. In this respect, exhausting in the horizontal direction can prevent this, and also from this point, the cooling efficiency can be improved.

If the heated air is not blown as far as possible away from the intake ports 7a, 7b of the electric motor, the heated air will be sucked again from the intake ports 7a, 7b, and the cooling efficiency will be improved. Will lead to a decrease in In this respect, if horizontal exhaust is performed as shown in FIG. 1, the heated air is discharged to a further distance, so that this re-inhalation can be prevented, and from this point also the cooling efficiency can be improved. .

Further, when the rotation direction is as shown in FIG. 2,
Since the velocity of the air exhausted horizontally in the portion a is higher, the air from the upper part of the electric motor is sucked in the direction of the portion a. Generally, when air flows in a stationary fluid, the surrounding air is entrained at the boundary by the energy of the flowing air. Convection occurs when trying to replenish this trapped air. As a result, the natural body flow cooling due to the change in the density of the upper part of the electric motor is replaced with the forced convection cooling, so that the heat radiation amount is greatly increased. That is, when the air flows horizontally and in the same direction, the flow from the upper part of the electric motor is more easily sucked, the speed of the air flow is increased, and thereby the cooling effect is increased.

Further, by making the exhaust ports 8a and 8b horizontal, in the conventional case where the exhaust ports 8a and 8b are opened radially, exhaust is performed almost straight in the vicinity of the exhaust ports 8a and 8b. That is, while the air flow arrow A increases, turbulences such as the wind flow arrows B to D easily occur.
As a result, the total area of the inner peripheral surface of the housing 4 on which the air hits increases. That is, since the heat radiation area increases, the cooling performance can be improved also by this. Further, by horizontally opening the exhaust port 8, the range in which the exhaust port 8 can be provided is expanded. That is, in the radial exhaust ports 8a and 8b of FIG. 13, an exhaust port cannot be provided at the position of the upper exhaust port g due to the restriction of the drip-proof structure, but this can be achieved in the horizontal direction. Therefore, since more exhaust ports 8a and 8b can be provided, the cooling performance can be improved also in this respect.

Furthermore, referring to FIG.
As shown in (a), a plurality of exhaust ports 8a and 8b are provided radially below the center of the housing 4 at equal pitches. Therefore, a that is sandwiched between the adjacent exhaust ports 8a and 8b
The cross-sectional shape of the part is almost the same as a quadrangle,
A plurality of beams having the same rigidity will be formed. When the electric motor is driven by an inverter or the like, the beam may resonate due to the electromagnetic excitation force. In addition, since the plurality of beams have the same rigidity, that is, the same natural frequency, all the beams are synchronized with each other to cause a large vibration phenomenon, which causes a large noise source of a single frequency. Also,
Since the air flow paths have the same shape, the frequency of the generated sound is the same, which has a drawback of becoming a large noise source of a single frequency.

In this regard, as shown in FIG. 52 (b), if the exhaust ports 8a, 8b are horizontal and a plurality of exhaust ports 8a, 8b are provided at equal pitches as in the above, they are adjacent to each other. The cross-sectional shape of the b portion sandwiched between the exhaust ports 8a and 8b is
As the position becomes lower, the shape changes from a substantially quadrangular shape to a substantially parallelogram shape, and beams having different rigidity are formed. As a result, even when the resonance as described above occurs, since the natural frequencies of the beams are different, a large single-frequency vibration phenomenon does not occur, and vibration noise can be significantly reduced. Further, since the air flow paths are different from each other, the generated sound does not have a single frequency, and the noise can be reduced.

Further, as shown in FIG. 3, when the exhaust ports 8a and 8b are provided in the portion a of the housing 4, the exhaust ports 8a and 8b are provided.
When b is radially opened as in the conventional case, as shown in the enlarged view of FIG. 3A, the opening surface is only the exhaust port opening e due to the restriction of the drip-proof structure. On the other hand, when the horizontal exhaust port 8 is similarly provided at the portion a, as shown in the enlarged view of FIG. 3B, in addition to the exhaust port opening e, an opening surface is formed by the exhaust port opening f. Therefore, the cooling capacity can be further improved together with the increase of the heat radiation area.

Next, the embodiment shown in FIG. 4 will be described. In the above-described embodiment, the exhaust port 8 is provided in the horizontal direction to improve the cooling capacity while preventing raindrops of 15 degrees with respect to the vertical direction, which is a condition of the drip-proof type, from directly entering the housing 4. However, from the perspective of maintaining performance,
There is a concern that raindrops once hit the housing 4 may indirectly enter the housing 4. On the other hand, in this embodiment, as shown in the enlarged view of FIG.
A slope 4b is provided on the lower surface of 8b. As a result, the raindrop b does not enter the housing 4 after hitting the housing 4 once, but goes out of the housing 4 along the slope 4b like the raindrop c. Therefore, according to this,
In addition to improving the cooling capacity of the above-mentioned embodiment, it is possible to prevent damage due to raindrops and further maintain the performance.

Next, the embodiment shown in FIG. 5 will be described. In this embodiment, in addition to the embodiment shown in FIG. 3, slopes 4b are also provided on the upper surfaces of the exhaust ports 8a and 8b. In the embodiment of FIG. 3, it is effective to provide the exhaust ports 8a and 8b at the upper half position of the housing 4, but the exhaust port 8 is provided at the lower half position of the housing 4. In some cases, measures against raindrop intrusion become less important. Rather, improvement of exhaust efficiency is desired. Therefore, in this embodiment, the exhaust port 8a,
The exhaust port side slope 4b is also provided on the upper surface of 8b so that the exhaust from the housing 4 can be made smooth to improve the cooling capacity. Here, as shown in FIG. 6, the exhaust port side surface slope 4b is further improved to be a curved surface 4i. According to this, FIG. 6 (b)
As shown in an enlarged view in FIG. 4, of the air flows A, B, and C from the inside of the housing 4, it is prevented that the air flows B and C collide with the side surfaces of the exhaust ports 8a and 8b of the housing 4 and are lost. In addition to being able to prevent the other flow, smoother exhaust can be realized and the cooling capacity can be further improved.

Next, the embodiment shown in FIG. 7 will be described. As shown in the above embodiment, the cooling capacity can be improved by providing the exhaust ports 8a and 8b in the housing 4 in the horizontal direction. However, as shown in FIG. 7, the exhaust port outer protrusions 8d are provided above the exhaust ports 8a and 8b. By extending to the side,
The measures against splash proof are further improved. According to this, the range in which the exhaust ports 8a and 8b are provided expands further upward as compared with the above-described embodiment, and the area that the cooling air hits, that is, the heat radiation area can be increased, so that the cooling capacity of the housing 4 is further improved. Can be achieved.

Next, the embodiment shown in FIG. 8 will be described. In the embodiment shown in FIG. 7, the protrusion 8d is provided on the upper outside of the exhaust ports 8a and 8b to strengthen the countermeasure against the drip-proof structure and improve the cooling capacity.
Instead of the housing 4 provided with d, a housing 4 having outer cooling fins 4a used in a totally enclosed outer fan type rotary electric machine as shown in FIG.
Only by providing a and 8b, the effect of the outer cooling fins 4a and the horizontal exhaust ports 8a and 8b not only further strengthens the measures against drip-proof, but also greatly increases the heat dissipation area, so the cooling capacity is increased. Will be further improved. Further, in the above-described embodiment and the prior art, the dedicated housing 4 is required as an open type, whereas in this embodiment, the housing 4 of the totally enclosed external fan type rotary electric machine can be partially processed to be shared. Therefore, it is advantageous in terms of cost. Further, if the outer cooling fins 4a are provided in a horizontal direction as shown in FIG. 9 instead of radially, the cooling air is more likely to hit the cooling fins 4a than in the case of FIG.
As shown in the enlarged view of (b), a turbulent flow, that is, a flow of cooling air B to G is likely to occur including the portion of the outer cooling fin 4a, and the cooling capacity can be further improved. Also, FIG.
As shown in FIG. 0, the outer cooling fins 4a of the housing 4 have curved roots, and the bell-mouth cooling fins 4j
In addition to the effect of the outer cooling fin 4a,
As shown in FIG. 10B, smooth exhaust can be performed as seen in the flows C and D of the cooling air, the cooling efficiency can be improved by improving the exhaust efficiency, and the noise due to the cooling air can be reduced.

Next, the embodiment shown in FIG. 11 will be described. In the embodiment of FIG. 10, the exhaust ports 8a and 8b are opened horizontally, whereas in this embodiment, the exhaust port side slope 4b is provided on the lower surface of the exhaust ports 8a and 8b as shown in FIG. It is a thing. As a result, the exhaust ports 8a, 8
Although the cooling effect due to the turbulent flow in b is somewhat lowered, it is combined with the drip-proof effect of the outer cooling fins 4a, and the exhaust ports 8a and 8b.
Since the opening area can be increased and the exhaust efficiency is improved, even when the number of outer cooling fins 4a is small and a large number of exhaust ports 8a and 8b cannot be provided, further improved exhaust is possible and the cooling capacity is improved. Can be achieved.

Next, with reference to FIG. 12, a method of manufacturing the exhaust port 8 in the housing 4 in the horizontal direction will be described. That is, in this embodiment, as shown in the drawing, the cutting die A, the cutting die B, the cutting die C, and the cutting die D are respectively indicated by arrows a,
By pulling out in four directions b, c, d, the horizontal exhaust ports 8a, 8b as well as the housing 4 can be produced by casting or die casting. Also, by adopting this manufacturing method, the degree of freedom in the shapes of the exhaust ports 8a, 8b and the outer cooling fins 4a is increased, and the various embodiments described above,
Alternatively, it becomes possible to manufacture rotary electricity as shown in various embodiments described later.

In this case, it is advantageous in that the exhaust ports 8a and 8b are slightly enlarged outwardly in terms of shape reduction. Also, when considering this manufacturing method, the exhaust port 8
It is extremely important to form a and 8b in the horizontal direction.

Next, the embodiment shown in FIG. 16 will be described. This is a configuration in which each of the exhaust ports 8a and 8b provided in the housing 4 is divided into two in the axial direction, and the two are arranged alternately. As a result, the mechanical strength of the housing 4 can be increased as compared with the case where the exhaust port is continuously opened. It should be noted that in this example, although it is divided into two,
There is no limitation on the number of divisions, and a predetermined effect can be obtained as long as it is plural.

Next, the embodiment shown in FIG. 17 will be described. 17A is a cut side view showing the right half of the housing 4, and FIG. 17B is a front view showing the left half of the housing 4. In this example, the rigidity of the periphery of the exhaust ports 8a and 8b is increased by partially increasing the wall thickness of the housing 4 provided with the exhaust ports 8a and 8b. With this configuration, it is possible to prevent the mechanical strength of the housing 4 from being lowered by providing the exhaust ports 8a and 8b in the housing 4.

Next, the embodiment shown in FIG. 18 will be described. 18A is a cut-away side view showing the right half of the housing 4, and FIG. 18B is a front view showing the left half of the housing 4. Most of the conventional drip-proof type rotary electric machines do not have the cooling fins 4a on the surface of the housing 4. However, in this embodiment, the outer cooling fins 4a are erected on the surface of the housing 4 to reduce the decrease in strength due to the exhaust ports 8a and 8b. Moreover, since the heat radiation area is increased by erecting these outer cooling fins 4a, the cooling effect can be improved. Furthermore, it is possible to prevent foreign matter from entering the inside of the rotating electric machine from the outer cooling fins 4a.

Next, the embodiment shown in FIG. 19 will be described. FIG. 19A is a cut side view showing the right half of the housing 4, and FIG. 19B is a front view showing the left half of the housing 4. In this example, in addition to the above-described embodiment, the exhaust port reinforcing ribs 4g are vertically provided between the outer cooling fins 4a so that the rigidity of the housing 4 in the radial direction can be improved. . .

Next, the embodiment shown in FIG. 20 will be described. 20A is a cut-away side view showing a main part of the housing 4, and FIG. 20B is a front view showing a main part of the housing 4. In this example, in addition to the above-described embodiment, exhaust port reinforcing ribs 4g are added to the openings of the exhaust ports 8a and 8b to increase the mechanical strength of the exhaust ports 8a and 8b. With such a configuration, the radial deformation of the housing 4 can be further reduced.

Next, the embodiment shown in FIG. 21 will be described. 21A is a cutaway side view showing the right half of the housing 4, and FIG. 21B is a front view showing the left half of the housing 4. In this example, in the structure shown in the above-described embodiment, the number of reinforcing ribs 4g between the adjacent outer cooling fins 4a is reduced, and the reinforcing ribs 4g are arranged in a staggered manner, so that the number of ribs can be improved more efficiently. This is intended to increase strength.

Next, the embodiment shown in FIG. 22 will be described. 22A is a cut-away side view showing a main part of the housing 4, and FIG. 22B is a front view showing a main part of the housing 4. In this example, the exhaust ports 8a and 8b are not formed in the shape of through holes, but the exhaust port reinforcing ribs 4g having a mesh structure are provided on the surface of the holes to improve the strength around the exhaust ports 8a and 8b. It is a thing.

Next, the embodiment shown in FIG. 23 will be described. This figure is a front view showing a main part of the housing 4. In the above-described embodiment, the outer cooling fin 4a is used as it is for the housing reinforcing rib, but in this embodiment,
By using the reinforcing rib 4h having a honeycomb structure, the mechanical strength is further increased. Further, in this way, the cooling effect can be improved by increasing the heat radiation area.

In the rotary electric machine employing the conventional axial flow cooling system as shown in FIG. 14, the anti-load side end bracket 9a
After the cooling air is sucked in to cool the stator 1 and the rotor 2 which are heat generating parts, they are exhausted from the load side end bracket 9b. At this time, since the rotor load side blade 2b does not have a fan guide, a pressure difference does not occur and the cooling air cannot be sufficiently sent as compared with the rotor counter load side blade 2a. Therefore, FIG.
If the exhaust port 8 is provided so that a pressure difference is generated on the anti-load side of the housing 4 as in the rotating electric machine shown in FIG. 4, the cooling air volume can be increased and the cooling capacity can be improved. Also,
As shown in FIG. 25, by providing the outer cooling fins 4a around the exhaust port 8, the cooling area can be further increased and the cooling capacity can be improved. Since the area of the exhaust port 8 on the coil end 1b flowing on the circumference of the stator 1 is wider, the effect of improving the cooling performance is greater.

Further, in the rotary electric machine adopting the conventional radiant flow cooling system as shown in FIG. 13, the cooling air is sucked from the end brackets 9b, 9a on both the load side and the non-load side, and the stator 1, which is a heat generating portion, and the rotor. After cooling 2, the gas is exhausted from the exhaust ports 8b and 8a10 of the housing 4. With this cooling method,
The circumference of the stator 1 cannot be cooled. Therefore, by using the rotating electric machine of FIG. 26 in which the fan guide 6 is provided on the load side of the rotating electric machine of FIG. 24, the cooling flow rate by the rotor load side blades 2b is increased, and the cooling of the stator 1 on the circumference is also possible. Therefore, compared to the conventional axial flow type, the cooling area is increased and the cooling capacity can be improved. Further, as shown in FIG. 27, by providing the outer cooling fins 4a around the exhaust port 8, the cooling area can be further increased and the cooling capacity can be improved. Further, the outer cooling fins 4a as shown in FIG. 28 are provided around the exhaust port 8 of the rotating electricity adopting the radiative cooling system as shown in FIG. 13 to increase the cooling area to improve the cooling capacity. You can Further, by dividing the exhaust port 8 as shown in FIG. 29, solid foreign matter enters,
It is possible to have a structure that is not adversely affected and to expand the cooling area. Further, by providing the outer cooling fins 4a directly on the exhaust port 8, it is possible to reduce the ventilation resistance and allow the cooling air to flow directly along the outer cooling fins 4a, thereby improving the cooling effect.

Next, the structure of the end bracket and the fan guide portion of the rotary electric machine will be described with reference to FIG.
FIG. 36 is a partially cut surface view of the rotary electric machine. This example
The end bracket 10 also serves as a fan guide. According to this, the number of parts can be reduced, which is effective, but it is necessary to consider so that water droplets or the like may not enter the rotating electric machine from the intake port 7 and adversely affect the stator 1. As in the rotating electric machine shown in FIG. 36, FIG. 30 is a drip-proof to prevent water droplets or the like from entering from the outside by providing the end bracket 10 with a role of a fan guide and providing the end bracket 10 with an outer protrusion 10a. It has a function. According to this, it is possible to prevent intrusion of water droplets or the like from the outside with a simple configuration.

FIG. 31 shows the structure shown in FIG. 30, in which an intake port enlarged portion 10c is provided in order to improve the flow of cooling air.

32 and 33, similarly to the rotating electric machine shown in FIG. 36, the end bracket 10 also serves as a fan guide, and the intake port 7 of the end bracket 10 has an inner projection 10b serving as a tray for receiving water drops and the like. By providing
It has a drip-proof function to prevent the influence of water droplets etc. inside the rotating electrical machine.

34 and 35, in the rotary electric machine shown in FIG. 30, by providing a rib 10d on the intake port 7,
It has a protective function to prevent foreign matter from entering from the outside.

As described above, FIG. 30, FIG. 31, FIG. 32, FIG.
34 and 35, the end bracket 10 also serves as a fan guide, and is provided with projections 10a and 10b having a drip-proof structure, an inlet expansion portion 10c, and an inlet rib 10d having a protective structure. All of these can be easily realized at the same time by manufacturing the end bracket 10 by casting, die casting, or the like.

FIG. 37 shows a structure in which the thickness of the housing 4 at a position corresponding to the flat portion 1c of the stator 1 press-fitted into the housing 4 is increased outward so as to cover the stator flat portion 1c. By doing this, the stator 1
Due to the fitting, the cross-sectional area is increased with respect to the tensile force generated in the housing thick portion 4c, so that the stress is reduced. Further, the amount of deformation is also reduced with respect to the bending deformation of the housing 4 that occurs near the corner portion 1d of the stator flat portion.

FIG. 38 shows a structure in which a contact plate 4 is joined to the outside of the housing 4 at the position of the stator flat portion 1c by welding or the like so as to cover the stator flat portion 1c. By doing so, the stator flat portion 1c generated by the fitting
The stress of the housing 4 in the vicinity is reduced by the contact plate 4d, and the bending deformation of the housing 4 in the vicinity of the corner portion 1d of the stator flat portion is also reduced.

FIG. 39 shows a structure in which the thickness of the housing 4 at the position of the stator flat portion 1c is increased inward. According to this, the tensile stress of the housing thick portion 4c caused by the fitting is reduced by the increase of the cross-sectional area. In addition, the space generated between the flat stator portion 1c and the thick wall portion 4c of the housing can be filled, and the extreme deformation of the housing 4 can be reduced.

FIG. 40 shows a shape in which the corner portion 1d of the stator flat portion is rounded. With this shape, stress concentration generated in the housing 4 can be reduced and bending deformation can be reduced.

FIG. 42 shows another embodiment of the present invention. Figure 4
2 (a) is a side view and FIG. 42 (b) is a front view. In this example, a terminal box 11 accommodating terminals for power supply mounted on the housing 4 and a rib 4e integrally formed on the housing 4 mount a structure on the upper part of the electric motor or stack the electric motors to form a mounting portion. By doing so, it becomes possible to simplify the packing material and increase the number of stacked electric motors when transporting the electric motors.
Storage costs can be reduced. Further, by utilizing this, a control device and the like can be loaded on the upper part of the electric motor, so that a compact system can be constructed.

FIG. 43 shows an embodiment in which the mounting portion shown in FIG. 42 is constituted by only the rib 4e. Even in this case, the structure has the same effect as that of FIG. 34 and can easily cope with the request for changing the position of the terminal box 11.

In FIG. 44, in order to make the loading easier than in FIG. 43, the tips of the ribs 4e are bent laterally outwardly and integrally molded with the housing to increase the mass and material of the ribs 4e. Instead, the mounting portion is configured. Further, by bending the rib 4e, the cooling area is increased, which is also effective in cooling performance. In this case, the rib 4e can also be used as a hanging hand.

FIG. 45 shows an embodiment in which the integrally molded rib 4e is divided in the axial direction. According to this, it is possible to provide a structure of an outdoor type, a waterproof type, etc., in which rain, water droplets, etc. are hard to collect and the electric motor can be used even in an environment where water is continuously applied.

FIG. 46 shows an embodiment in which the rib 4e is formed in a cylindrical shape and is integrally molded on the housing 4. According to this, it is possible to obtain a structure in which rainwater is hard to collect and has a strong strength.

FIG. 47 shows the foot FT on the upper part of the housing 4.
This is a structure in which the legs 4f having the same shape as the above are integrally molded. With this structure, the electric motors can be easily stacked.

In FIG. 48, the mounting position of the terminal box 11 is changed from that of FIG. 47, and the position of the terminal box 11 can be easily reversed right and left by turning the electric motor upside down in the assembled state. This is an example.

FIG. 49 shows an embodiment in which a device (indicated by a chain double-dashed line) incidental to the rotating electric machine is laterally mounted using the terminal box 11 and the rib 4e.

FIG. 50 shows an embodiment in which a device attached to a rotary electric machine is laterally mounted using only the rib 4e.

FIG. 51 differs from FIG. 50 in the upper rib 4e.
This is an example in which the is bent, and is designed so that the device can be attached more easily.

FIG. 53 is a rotary electric machine constructed by adopting the essential parts of each of the above-mentioned embodiments, FIG. 53 (a) is a partially cut side view, and FIG. 53 (b) is a partially cut surface view. That is, in this embodiment, the housing 4 is provided with the exhaust port 8 provided in the horizontal direction. Further, cooling fins are arranged between the adjacent exhaust ports 8, and the wall thickness of the housing 4 in the portion corresponding to the flat portion of the stator 1 is made thicker than the wall thickness of other portions. The cooling fins arranged around the outside of the housing 4 are arranged parallel to each other in the vertical and horizontal directions.
Control device with cooling fins placed on top of housing 4,
For example, it constitutes a mounting portion of the inverter device. In addition, the terminal box will be installed laterally. On the other hand, the end bracket is the bracket 10 that also serves as a fan guide. By doing so, an electric motor having excellent cooling and drip-proof properties can be constructed.

The above-mentioned configuration of the embodiment has the following effects. That is, if configured as shown in FIG.
By performing the horizontal exhaust, the heat radiation area of the exhaust port is increased and the cooling capacity is improved. In addition, as the opening range of the exhaust ports expands, the number of exhaust ports can be increased, or the options for arranging the exhaust ports at more appropriate positions will expand, and in the vicinity of the horizontally opened exhaust ports. Turbulence is likely to occur, and the total area exposed to the wind increases. As a result, the heat dissipation area increases, which improves the cooling capacity, especially the cooling capacity of the housing. Also, FIG.
With this configuration, raindrops can be prevented from directly or indirectly entering the housing, and the dripproof performance can be improved. Further, if configured as shown in FIGS. 5 and 6, the opening area of the exhaust port at the position where drip-proof measures are not the most important can be expanded, the exhaust efficiency is improved, and the cooling capacity can be improved. Also, by rounding the corners on the side of the exhaust port,
Smooth exhaust is possible, and further cooling and noise reduction can be realized. With the configuration shown in FIG. 7, the effect of FIG. 2 can be obtained more easily by providing the protrusion on the upper portion of the exhaust port. According to the structure shown in FIG. 8, by using a housing with cooling fins instead of the housing with protrusions shown in FIG. 7, the heat radiation area is further increased, so that the cooling capacity is improved and the cooling fins provide a drip-proof effect. Since it also improves, it is possible to increase the number of exhaust ports. in addition,
Since the housing of the fully-enclosed outer fan type rotary electric machine can be used as the housing with fins, a dedicated housing is not required as the open type, which is advantageous in terms of cost. 9 and 10, by using fins that are horizontal with respect to FIG. 8, countermeasures against drip are improved, more exhaust ports are provided, and a structure in which the fins are easily exposed to wind Therefore, it is advantageous in that the cooling capacity is improved. Also, by devising the shape of the fins, smooth exhaust can be achieved, and further improvement in cooling performance and noise reduction can be realized. With the configuration shown in FIG. 11, when the cooling effect due to turbulent flow is improved, such as when the number of fins is not large and the number of exhaust ports is small,
Since improvement of the exhaust capacity is desired, it is advantageous in that the shape of the exhaust port is provided with a slope so that the countermeasure can be taken.

Further, by distributing the arrangement of the housing exhaust ports in the axial direction and increasing the thickness of the frame around the exhaust ports, the rigidity of the housing can be improved and vibration and noise can be reduced.

Further, by providing an exhaust port in the housing and further providing external fins around the exhaust port, the cooling capacity can be improved, and the drip-proof protection structure can be strengthened, so that the efficiency of the open type rotating electric machine is improved, and the size and weight are small. Has the effect of

Furthermore, since the fan guide / bracket can satisfy the drip-proof protection structure, the safety of the rotating electric machine can be improved.
It has the effect of improving reliability.

Furthermore, since the deformation of the frame due to the fitting of the stator can be reduced, the vibration and noise due to the eccentricity of the rotor can be reduced.

Furthermore, since the rotary electric machines can be stacked, there is an effect that the packing material, which conventionally had to maintain the strength at the time of stacking, can be simplified and the cost can be reduced.

Furthermore, since it becomes easy to fix the equipment attached to the rotary electric machine, there are economical effects such as space saving and reduction of the mounting jig cost.

[0092]

As is apparent from the above description, according to the present invention, since the shape of the exhaust port of the housing is arranged in the horizontal direction, the heat radiation surface can be increased as compared with the conventional radial exhaust port. Since the cooling area can be increased, the cooling performance can be improved.

Further, when the exhaust port is provided in the horizontal direction, it becomes difficult for water droplets to enter the inside of the rotary electric machine, so that it is possible to widen the opening width of the exhaust port or install it on the upper part of the side surface of the frame. The air exhaust area can be increased, and the cooling performance can be further improved. The increase in exhaust area is
This means a reduction in ventilation resistance, and the cooling air volume can be increased even in a cooling system using the same cooling fan. That is, it is possible to obtain a rotary electric device having an improved cooling capacity by increasing the cooling air volume and the cooling area.

If the exhaust ports provided in the housing are formed so as to be distributed in the axial direction, the strength-reduced portions due to the exhaust ports do not overlap on the same plane, so that the strength of the entire housing can be improved. In the exhaust port provided in the housing, the thick wall portion (reinforcing rib) provided around the exhaust port shares the stress, and the strength reduction of the housing due to the provision of the exhaust port is compensated.

Further, by providing the exhaust port in the housing of the axial cooling type rotary electric machine, the cooling air sucked from the anti-load side bracket and cooling the rotor and the stator is replaced with the cooling air sucked from the load side bracket. It is exhausted from the exhaust port without interference. As a result, the ventilation resistance of the cooling air sucked from the anti-load side bracket can be reduced, the flow rate is increased, and the cooling capacity is improved. Also, by providing a fan guide near the stator load side coil end as well, the intake / exhaust pressure difference between the blades on the rotor load side increases, and fan efficiency increases, so cooling air from the load side increases. The cooling capacity can be further improved.

Furthermore, due to the projection provided on the bracket that also serves as the fan guide, the penetration of water droplets attempting to enter at an angle of 15 degrees from the vertical is prevented at the projection.

Further, by providing the housing 4 with the thick portion, the cross-sectional area is increased, the tensile force at that portion is reduced, and the deformation of the housing is reduced.

Furthermore, by rounding the flat portion of the stator, the tensile stress on the housing is reduced and the deformation of the housing 4 is reduced.

Furthermore, the projection provided on the upper portion of the rotating electric machine can form a flat surface on the upper surface of the rotating electric machine, and by utilizing this surface, the rotating electric machines can be stacked. Also,
By using the same surface, it becomes easy to fix the accessory device to the upper part of the rotating electric machine.

Furthermore, by providing the outer fins around the exhaust port, the cooling air can be reused and the drip-proof structure can be strengthened.

[Brief description of drawings]

FIG. 1 is a partially cut surface view showing a first embodiment of the present invention,
FIG.

FIG. 2 is a cut side view for explaining the principle of the present invention and a partially enlarged sectional view of an exhaust port portion.

FIG. 3 is a cut-away side view showing another embodiment of the present invention and a partially enlarged sectional view of an exhaust port portion.

FIG. 4 is a sectional side view showing still another embodiment of the present invention and a partially enlarged sectional view of an exhaust port portion.

FIG. 5 is a cut-away side view showing still another embodiment of the present invention and a partially enlarged sectional view of an exhaust port.

FIG. 6 is a cut side view showing still another embodiment of the present invention and a partially enlarged sectional view of an exhaust port.

FIG. 7 is a cut-away side view showing still another embodiment of the present invention and a partially enlarged sectional view of an exhaust port portion.

FIG. 8 is a cut-away side view showing still another embodiment of the present invention and a partially enlarged sectional view of an exhaust port.

FIG. 9 is a cut side view showing still another embodiment of the present invention, and a partially enlarged sectional view of an exhaust port portion.

FIG. 10 is a sectional side view showing still another embodiment of the present invention,
FIG. 5 is a partially enlarged cross-sectional view of an exhaust port.

FIG. 11 is a sectional side view showing still another embodiment of the present invention,
FIG. 5 is a partially enlarged cross-sectional view of an exhaust port.

FIG. 12 is a side view showing an embodiment of the manufacturing method of the present invention.

FIG. 13 is a partially cut surface view and a cut side view showing an example of a conventional rotating electric machine.

FIG. 14 is a partially cut surface view and a cut side view showing another example of a conventional rotating electric machine.

FIG. 15 is a cut side view for explaining a drip-proof protection structure,
FIG. 5 is a partially enlarged cross-sectional view of an exhaust port.

FIG. 16 is a surface view showing still another embodiment of the present invention.

FIG. 17 is a cutaway side view and partial surface view of a housing showing still another embodiment of the present invention.

FIG. 18 is a cutaway side view and partial surface view of a housing showing still another embodiment of the present invention.

FIG. 19 is a cutaway side view and partial surface view of a housing showing a further embodiment of the present invention.

FIG. 20 is a cutaway side view and partial surface view of a housing showing a further embodiment of the present invention.

FIG. 21 is a cutaway side view and partial surface view of a housing showing a further embodiment of the present invention.

FIG. 22 is a cutaway side view and partial surface view of a housing showing still another embodiment of the present invention.

FIG. 23 is a partial surface view of a housing showing still another embodiment of the present invention.

FIG. 24 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 25 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 26 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 27 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 28 is a surface view showing still another embodiment of the present invention.

FIG. 29 is a front view showing still another embodiment of the present invention.

FIG. 30 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 31 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 32 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 33 is a side view of the rotary electric machine shown in FIG. 32.

FIG. 34 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 35 is a side view of the rotary electric machine shown in FIG. 34.

FIG. 36 is a partially cut surface view showing still another embodiment of the present invention.

FIG. 37 is a perspective view showing still another embodiment of the present invention and a side view thereof.

FIG. 38 is a perspective view showing still another embodiment of the present invention and a side view thereof.

FIG. 39 is a perspective view showing still another embodiment of the present invention and a side view thereof.

FIG. 40 is a perspective view, a side view, and a partially enlarged side view showing still another embodiment of the present invention.

41 is a perspective view, a side view, and a partially enlarged side view showing still another embodiment of the present invention. FIG.

42A and 42B are a side view and a front view showing still another embodiment of the present invention.

FIG. 43 is a side view and a front view showing still another embodiment of the present invention.

FIG. 44 is a side view and a front view showing still another embodiment of the present invention.

FIG. 45 is a side view and a front view showing still another embodiment of the present invention.

FIG. 46 is a side view and a front view showing still another embodiment of the present invention.

47A and 47B are a side view and a front view showing still another embodiment of the present invention.

FIG. 48 is a side view and a front view showing still another embodiment of the present invention.

FIG. 49 is a side view and a front view showing still another embodiment of the present invention.

FIG. 50 is a side view and a front view showing still another embodiment of the present invention.

51 is a side view and a front view showing still another embodiment of the present invention. FIG.

FIG. 52 is a partially enlarged side view of the housing for explaining the principle of the present invention.

FIG. 53 is a partially cut side view and a partially cut surface view showing still another embodiment of the present invention.

[Explanation of symbols]

1 ... Stator, 2 ... Rotor, 3 ... Bearing, 4 ... Housing, 5 ... Shaft, 6 ... Fan guide, 7 ... Intake port, 8
...... Exhaust port, 9 ... End bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Sekine 7-1-1 Higashi Narashino, Narashino, Chiba Prefecture Hitachi Narashino Factory (72) Inventor Keiichiro Kaichiro 7-1-1 Higashi Narashino, Narashino, Chiba Prefecture Hitachi, Ltd. Narashino Factory (72) Inventor Naofumi Otani 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture In Hitachi Narashino Factory (72) Inventor Takahiro Takeda 7-1, 1-1 Higashi Narashino, Narashino, Chiba Prefecture Hitachi, Ltd. Narashino Factory (72) Inventor Tsurumasa Matsushita 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Ltd. Narashino Factory, (72) Inventor Shoji Senoo 7-1, Higashi Narashino, Narashino City, Chiba Prefecture Issue Hitachi, Ltd. Narashino Factory (72) Inventor Toshimitsu Oku Chiba 7-1, Higashi Narashino, Narashino, Nara Prefecture, Japan Narashino Factory, Hitachi, Ltd.

Claims (1)

[Claims] 1. A housing 4 having a stator 1 and a rotor 2 for converting electric energy into a rotational force, the housing 4 holding the stator 1 at its inner peripheral portion, and a rotor 2 holding the rotor 2.
In a rotary electric machine including a shaft 5 that transmits a rotational force generated in the shaft 5, a bearing 3 mounted on the shaft 5, and an end bracket 9 that connects the bearing 3 and the housing 4, a protrusion that can be attached to a structure on an upper portion of the housing 4. 4e is provided,
A rotary electric machine characterized by forming a flat surface by this.