JP7005372B2 - Rotating electric machine, electric vacuum cleaner, balance test method of rotating electric machine, manufacturing method of rotating electric machine, and manufacturing method of electric vacuum cleaner - Google Patents

Description

The present invention relates to a rotary electric machine , an electric vacuum cleaner , a balance test method for a rotary electric machine, a method for manufacturing a rotary electric machine, and a method for manufacturing an electric vacuum cleaner .

In the balance test method for a rotating body that does not have a support journal, the rotating body is floated and tested by using a fluid as a means for supporting the rotating body and a means for moving the rotating body, and the wear of the rotating body is reduced with high accuracy. A technique capable of this is presented (see Patent Document 1).

Japanese Unexamined Patent Publication No. 59-083028

When testing a fan that constitutes a rotary machine with a prior art configuration, a secondary hole is required to supply the fluid that floats the fan as a rotating body. The present invention is to obtain a rotary electric machine, an electric vacuum cleaner, and a balance test method for a rotary electric machine, which does not require a secondary hole configuration for fluid supply and can perform a balance test by a simple configuration means.

The rotary electric machine according to the present invention includes a fan in which a through-hole portion inserted by a drive shaft is fitted to the drive shaft and mounted on the drive shaft, and the fan is at least one in the through-hole portion. A chamfered portion is provided at the corner of the end face, and the chamfered portion is attached by fitting a support journal into the through-hole portion of the fan that is not mounted on the drive shaft when testing the balance of the fan. It is characterized in that it is supplied from the support journal between the support journal and a portion of the insertion hole portion other than the chamfered portion, and is pressurized by a fluid that floats the fan .
Further, the balance test method for a rotary electric machine according to the present invention includes a fan in which a penetration hole portion inserted by a drive shaft is fitted to the drive shaft and mounted on the drive shaft, and the fan is inserted into the drive shaft. In testing the balance of the fan for a rotary electric machine having a chamfered portion at at least one end face corner portion in the hole portion, the insertion hole portion of the fan not mounted on the drive shaft is erected upright. The fan is fitted and attached to a support journal, and the chamfered portion is pressed by a fluid supplied from the support journal between the support journal and a portion of the fan in the insertion hole portion other than the chamfered portion to press the fan. It is characterized by being made to float.

According to the present invention, there is obtained a rotary electric machine , an electric vacuum cleaner , a balance test method for a rotary electric machine, a method for manufacturing a rotary electric machine, and a method for manufacturing an electric vacuum cleaner, which can perform a balance test on a fan constituting a rotary electric machine by a simple configuration means. be able to.

It is a vertical sectional view which shows the rotary electric machine in Embodiment 1 which concerns on this invention. It is a vertical sectional view which shows the balance test apparatus of the fan which constitutes the rotary electric machine in Embodiment 1 which concerns on this invention. It is a vertical sectional view of the fan which constitutes the rotary electric machine in Embodiment 1 shown in FIG. It is explanatory drawing which showed that the fan constituting the rotary electric machine in Embodiment 1 shown in FIG. 1 floats by fluid pressure. FIG. 3 is a top view of a balance test device for testing a fan constituting a rotary electric machine according to the first embodiment shown in FIG. 1. It is a vertical sectional view which shows the balance test apparatus in prior document 1. FIG. It is a side view which shows the electric vacuum cleaner equipped with the rotary electric machine in Embodiment 1 shown in FIG. FIG. 3 is a vertical cross-sectional view showing a single shape of a fan constituting a rotary electric machine according to the first embodiment shown in FIG. 1. It is a vertical sectional view of the fan which constitutes the rotary electric machine in Embodiment 2 which concerns on this invention. It is a vertical sectional view of the fan which constitutes the rotary electric machine in Embodiment 3 which concerns on this invention. It is a vertical sectional view of the fan which constitutes the rotary electric machine in Embodiment 4 which concerns on this invention. It is a vertical sectional view of the fan which comprises the rotary electric machine in Embodiment 5 which concerns on this invention. It is a vertical sectional view of the fan which comprises the rotary electric machine in Embodiment 6 which concerns on this invention.

Embodiment 1.
Embodiment 1 according to the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is a vertical sectional view showing the configuration of the rotary electric machine 1 according to the embodiment.
The rotary electric machine 1 has a frame 2, and a stator 3 and a rotor 4 are attached to the frame 2. The stator 3 has a structure in which a coil is wound around a magnet or a laminated iron core laminated in the output shaft direction. The rotor 4 has a drive shaft 5, and a rotor core 6, a fan 7, and a pair of bearings 8 that support the drive shaft 5 are attached to the drive shaft 5. The rotor core 6 is composed of a magnet or a laminated iron core laminated in the output axis direction. The bearing 8 is attached between the rotor core 6 and the fan 7, and a spring 9 for applying a preload to each of the bearings 8 is arranged between the pair of bearings.

The bearing 8 is fixed to the housing portion 10 of the frame 2 by press fitting or adhesion. The pair of bearings 8 are spaced apart from each other by a predetermined distance, and the spring 9 has a predetermined spring constant, so that a preload of the same force is applied to both bearings 8. As a result, a non-excessive preload is applied while preventing slippage and backlash inside the bearing 8, so that the life of the bearing can be extended. Further, by accurately positioning both bearings, it is possible to prevent misalignment between the rotor core 6 and the stator 3 and reduce vibration.

The frame 2 having a housing for holding both bearings can be finished with high precision by molding by pressing or die casting and then cutting, and when the rotor 4 is attached, the bearing 8 follows the housing. It can be inserted so that it is aligned accurately. The rotor core 6 has a cutting mark 11. This is because the weight of the rotor core 6 is eccentric due to machining errors and assembly errors on the shaft 5, and when the rotor core 6 is operated in this state, the eccentric weight (hereinafter referred to as unbalanced) becomes centrifugal force and becomes a rotor. In order to act and generate excessive vibration, the axial end portion of the rotor core is cut in order to adjust the imbalance of the rotor core 6. The fan 7 also has a cutting mark 12 on the outer peripheral surface for the same reason.

In the fan 7 according to the first embodiment of the present invention, the corner of the axial end portion of the through-hole portion TH composed of the hole 13 into which the drive shaft 5 is inserted is chamfered to form the chamfered portion 14. This is because when measuring the balance of the fan 7, the fan 7 does not have a support journal, that is, a bearing support, so that the fan 7 is floated and rotated by fluid pressure in order to rotate, or a hole possessed by the fan 7. 13 must be gripped and rotated by the collet chuck of the rotary spindle. In particular, when rotating using a rotary spindle, high-precision measurement is difficult because the imbalance of the collet chuck and the gap generated between the collet chuck and the inner surface of the hole 13 of the fan 7 affect the measurement accuracy.

On the other hand, when the fan 7 is floated and rotated by the fluid pressure, the error caused by the fitting tolerance of the fan 7 and the low surface accuracy of the hole of the fan 7 can be compensated by the fluid flowing inside the hole, and the fan 7 is stable. Since the axis of rotation can be obtained, highly accurate measurement is possible. Further, since there is no mechanical sliding portion, there is no risk of damaging the fan 7. The problem is to make the fan 7 float stably with the fluid pressure. If there is a chamfered portion 14 like the fan 7 of the first embodiment according to the present invention, fluid pressure acts on the chamfered portion 14 and the fan 7 can be stably floated.

FIG. 2 is a schematic view of a device for measuring the balance of the fan 7 in a state where the fan 7 constituting the rotary electric machine shown in FIG. 1 is not mounted on the drive shaft 5 (see FIG. 1). In the balance measuring device 15, the vibration bridge 16 is supported by the support spring 17. The vibration bridge 16 includes a support journal 18. The support journal 18 is provided vertically and has an axial hole 19 in the center. The vibration bridge 16 includes a port 20 for supplying a fluid, and a horizontal hole 21 extends from the port 20 and is connected to an axial hole 19. If the fan 7 is inserted along the support journal 18, it rests on the shoulder 22 of the vibrating bridge 16. After that, a fluid is supplied from the port 20 to float the fan 7. The outer circumference of the shoulder-shaped portion 22 needs to be larger than the chamfered portion 14 of the fan 7, and the higher the surface accuracy of the surface of the shoulder-shaped portion 22, the better the sitting of the fan 7.

FIG. 3 is an enlarged vertical sectional view of 18 portions of the support journal of FIG. A plurality of holes 23 are provided in the radial direction from the holes 19 in the axial direction. As the fluid to be supplied, a gaseous fluid such as air or a liquid fluid such as water or oil can be used, but if a liquid fluid is used, it is necessary to clean the liquid adhering to the fan after measurement. Therefore, it is desirable to select air. The supplied fluid escapes to the outside through the radial hole 23 of the support journal 18 and through the gap between the fan 7 and the support journal 18. Since the high-pressure fluid is supplied, the fluid pressure acts on the inner surface 24 formed by the chamfered portion 14 provided in the through-hole portion TH composed of the holes 13 in the fan 7.

FIG. 4 is a diagram illustrating the principle that the fan 7 floats due to the fluid pressure. A high-pressure fluid is supplied from the center of the support journal 18 through the hole 23 and escapes through the gap 25 between the fan 7 and the support journal 18. The arrow symbol FD indicates the direction in which the fluid flows. Looking at the gap 25 as a flow path, the upstream vicinity 26 has a high pressure, while the outlet vicinity 27 has the same value as the atmospheric pressure, and the supply pressure is reduced to the atmospheric pressure by the pipe friction resistance of the gap 25. The pressure at the chamfered portion 14 of the fan is as high as the pressure at 26 near the upstream. The force that floats the fan is given by the product of the area of the surface 28 projected from the chamfered portion 14 in the axial direction and the pressure in the chamfered portion 14. The arrow vector FP indicates the surface pressure due to the fluid.

In order to float the fan 7, the floating force needs to be larger than the gravity due to the weight of the fan 7, and the floating force can be determined by the pressure in the vicinity of the chamfered portion 14 and the area of the chamfered portion. Since the axial hole 19 is much larger than the gap 25 between the fan 7 and the support journal 18, the pipe friction resistance is small, and it is possible to suppress the pressure drop until the fluid reaches the gap from the supply port. Therefore, the pressure in the vicinity of the chamfered portion 14 of the fan 7 is almost the same as the supply pressure of the fluid. That is, the fluid supply pressure can be controlled by the regulator that drives the balance test device 15, and it is preferable to determine the area of the chamfered portion 14 so that the fan 7 floats within the range that can be set by the regulator. As a result, the fan 7 can be stably floated when the device is started.

FIG. 5 is a top view of the balance measuring device 15 shown in FIG. As a driving means for rotating the fan 7, the airflow 30 jetted from the air nozzle 29 in the substantially tangential direction of the fan rotates the fan 7.
When performing a balance test on the fan 7, the fan 7 is removed from the drive shaft 5 of the rotary electric machine 1 to be in a non-mounted state, and is fitted to the support journal 18 of the balance test device 15 as described above to be fitted to the chamfered portion 14. A balance test is performed to detect the balance state by being rotated by the air flow 30 from the air nozzle 29 and being in a floating state due to the fluid pressure applied to the air nozzle 29. The balance adjustment of the fan 7 is executed based on the balance state detection result for the fan 7.

FIG. 6 is a schematic diagram for balancing and measuring a fan similar to the fan 7 of the rotary electric machine shown in FIG. 1 by the apparatus described in the prior art. The difference from the balance test apparatus shown in FIG. 2 is that the plate 31 provided perpendicular to the axis of the support journal 18 is provided with an auxiliary hole 32. The sub-hole 32 is open to the upper surface 33 of the plate 31. The auxiliary hole 32 receives the fluid supply from the supply port 35 via the annular flow path 34. The fan 7 can be floated by blowing the fluid from the sub-hole 32 toward the fan 7. In this case, chamfering is not required at the corners of the end faces of the holes of the fan 7, but the sub-hole for floating the fan 7 and the supply pressure of the sub-hole are controlled as compared with the balance measuring device 15 shown in FIG. A regulator is required for this, which complicates the structure of the device.

FIG. 7 shows a configuration in which the rotary electric machine 1 shown in FIG. 1 is mounted on the vacuum cleaner 36. As shown in the first embodiment of the present invention, the balance of the fan 7 can be corrected with high accuracy by stably floating the fan 7, and the rotary electric machine 1 equipped with the fan 7 has low vibration and low vibration. Noise can be reduced. Therefore, it is possible to reduce noise and vibration even in the vacuum cleaner 36 equipped with the rotary electric machine 1.

FIG. 8 is an enlarged vertical sectional view of the fan 7 of the rotary electric machine shown in FIG. One of the end face corners of the hole 13 of the fan 7 is chamfered by the chamfered portion 14. In the first embodiment, the chamfered shape of the chamfered portion 14 is a C chamfer that forms a flat surface at the corner of the end face. In the case of C chamfering, it is easy to calculate the projected area 28 in the axial direction, which is an important parameter when the fan 7 is floated and is the pressure receiving area. For C chamfering, if the fan 7 is a molded product, the chamfered portion 14 can be attached to the fan 7 by attaching a chamfered shape to the mold, but it is necessary to change the mold when there is a design change in the chamfered shape. Therefore, the cost will increase. On the other hand, chamfering can be done by post-cutting, and even if the chamfer shape is changed, it can be flexibly handled by simply changing the cutting tool, but if the fan 7 is made of a material such as resin, it will be cut. The workability is poor and it is difficult to obtain high accuracy. The chamfering method for the chamfered portion 14 may be selected according to the specifications of the fan 7.

Both ends of the end face corners on both end faces of the hole 13 may be chamfered by the chamfered portion 14, and when the fan 7 is set in the balance measuring device 15, either the upper or lower surface is set to the lower side. Therefore, workability is improved. However, there is a demerit that it takes a long time to process. Further, when the fan 7 is molded, burrs are likely to appear at the corners of the end faces of the holes 13. If burrs are exposed on the end face 40 of the fan, the device may be damaged when the fan 7 is set on the balance measuring device 15, or the burr and the device may come into contact with each other when the fan 7 is rotated, so that the fan 7 is moved. There is a risk of hindering stable rotation. If the fan 7 is deburred after the balance is corrected, the balance deteriorates, which may cause vibration or noise. Therefore, by chamfering the end face corner portion of the hole 13 by C chamfering, burrs appearing on the end face 40 of the fan 7 can be removed.

As shown in FIGS. 1 to 8, the following configuration is applied to the rotary electric machine according to the first embodiment of the present invention.
A stator 3 in which a coil is wound around a laminated iron core, a rotor 4 having a drive shaft 5 and composed of a rotor core, a frame 2 to which the stator 3 and the rotor 4 are assembled, and a drive shaft 5 penetrate. Between the fan 7 as a rotating body in which the through-hole portion TH composed of the hole 13 to be inserted is fitted to the drive shaft 5 and mounted on the drive shaft 5, and the rotor core of the rotor 4 and the fan 7. It is provided with a pair of bearings including bearings 8 that support the drive shaft, and has cutting marks on the axial end portion of the rotor core of the rotor 4 and the outer peripheral surface of the fan 7. The through-hole portion TH inserted through the drive shaft 5 is inserted into the drive shaft 5 and mounted on the drive shaft 5, and the fan 7 is at least one of the through-hole portions TH made of the holes 13. It is characterized in that a chamfered portion composed of a chamfered portion 14 having a pressure receiving plane formed as an inclined angle surface by C chamfering having a predetermined pressure receiving area is provided at the end face corner portion of the above.
With this configuration, it is possible to obtain a rotary electric machine capable of performing a balance test on the fan 7 constituting the rotary electric machine by a simple configuration means, and the rotary electric machine 1 equipped with this fan 7 can achieve low vibration and low noise. Therefore, even in the electric vacuum cleaner 36 equipped with the rotary electric machine 1, it is possible to realize low noise and low vibration.

Further, in the balance test method of the rotary electric machine according to the first embodiment of the present invention, the following method is applied.
A through-hole portion TH composed of a hole 13 to be inserted through the drive shaft 5 includes a fan 7 as a rotating body fitted to the drive shaft 5 and mounted on the drive shaft 5, and the fan 7 is inserted into the drive shaft 5. A rotary electric machine provided with a chamfered portion consisting of a chamfered portion 14 having a predetermined pressure receiving area at at least one end face corner portion in the hole portion TH is mounted on the drive shaft 5 when testing the balance of the fan 7. A support journal 18 that erects the insertion hole portion of the fan 7 that is in the previous state or is removed from the drive shaft 5 and is not mounted on the drive shaft 5 and is not mounted on the drive shaft 5. The fan is floated by pressurizing the fluid pressure supplied from the support journal 18 to the chamfered portion.

It is supplied from the center of the support journal 18 through the hole 23 between the support journal 18 and the insertion hole portion formed by the hole 13 of the fan 7, and pressurizes the chamfered portion composed of the chamfered portion 14. The support journal 18 is projected onto the upper surface of a base composed of shoulder-shaped portions 22 provided on the vibration bridge 16 of the balance test device 15, and the fan fitted to the support journal 18 is fitted. The chamfered portion is pressed by the step of disposing the 7 on the upper surface of the base composed of the shoulder-shaped portion 22 and the fluid pressure supplied between the support journal and the through-hole portion of the fan to press the chamfered portion. Since the product of the pressure receiving area and the fluid pressure in the chamfered portion consisting of 14, the product is larger than the own weight of the fan 7, the fan 7 is levitated against the gravity due to the self-weight of the fan 7. The balance characteristic of the fan 7 is detected by the step of blowing the airflow 30 from the air nozzle 29 to the fan 7 to rotate the fan 7 and the vibration state applied to the support journal by the fan 7 in a floating and rotating state. It is characterized by including a step and a step of adjusting the balance of the fan 7 based on the detection result of the balance characteristic.

By this method, it is possible to obtain a balance test method for a rotary electric machine capable of performing a balance test on a fan 7 constituting the rotary electric machine by a simple configuration means.
The fan 7, which is the target of the test method in the first embodiment of the present invention, is provided with a through-hole portion TH having a hole 13 on the central axis, and a corner portion on one side surface of the hole 13 is a flat surface formed by C chamfering. It is a chamfered portion 14 to be formed. The product of the area of the chamfered portion 14 by C chamfering and the fluid pressure is larger than the weight of the fan itself. The fluid supplied from the axial center hole provided in the support journal 18 on the balance test device 15 side allows the fluid pressure to act on the chamfered portion 14 by the C chamfer of the fan 7 in the direction of floating the fan 7 so that the fan 7 can be floated.
That is, in the equilibrium test method of a rotating body that does not have a support journal like the fan 7 that is mounted on the drive shaft 5, when the fan 7 is driven by using a fluid, the fan 7 is stably floated and balanced. Since the measurement can be performed with high accuracy, the fan 7 having a small imbalance can be manufactured. In a rotary electric machine using this, vibration can be reduced.
Further, since the auxiliary hole is not required on the device side, the device itself can be made compact and the cost can be reduced. Further, since the burr in the hole 13 of the fan 7 can be removed by chamfering, there is no possibility that the burr will damage the support journal 18 on the device side.

Embodiment 2.
Embodiment 2 according to the present invention will be described with reference to FIG. FIG. 9 is a vertical sectional view showing a fan 37 of a rotary electric machine according to a second embodiment. One of the end face corners of the through hole TH formed by the hole 38 of the fan 37 is chamfered to provide a chamfered portion 39. The shape of the chamfer in the chamfered portion 39 is an R chamfer that forms an arc-shaped curved surface in the second embodiment. In the case of the chamfered portion 39 by R chamfering, the projected area SB in the axial direction, which is an important parameter when floating the fan 37, can be obtained from the R dimension indicating the radius forming the arcuate curved surface. It is easier to calculate than the case of C chamfering. Both ends of the end face corner portion in the through hole portion TH may be chamfered, and when the fan 37 is set in the balance measuring device 15 (see FIG. 2), either the upper or lower surface is set to the lower side. Therefore, workability is improved. However, there is a demerit that it takes a long time to process. The chamfered portion 39 by R chamfering can remove burrs from the corners of the end faces of the fan 37, and when the fan 37 is floated by the balance measuring device 15, the fan 37 can be stably floated. In addition, it is possible to prevent deterioration of balance due to burrs.

In the rotary electric machine according to the second embodiment of the present invention, as shown in FIG. 9, the following configuration is applied to the configuration according to the first embodiment described above.
The chamfered portion consisting of the chamfered portion 39 by R chamfer forming an arc-shaped curved surface having a predetermined pressure receiving area at at least one end face corner portion of the through hole portion TH of the fan 37 corresponding to the fan 7 in the first embodiment. It is characterized by being provided.
With this configuration, it is possible to perform a balance test on the fan 37 constituting the rotary electric machine by a simple configuration means, and it is possible to obtain a rotary electric machine capable of improving workability in the balance test.

Embodiment 3.
Embodiment 3 according to the present invention will be described with reference to FIG. FIG. 10 is a vertical sectional view showing a fan 41 of a rotary electric machine according to a third embodiment. The structure is such that one of the ends of the through-hole portion TH formed of the hole 42 of the fan 41 has a stepped portion. The force for floating the fan 41 is given by the product of the area of the step portion 43 and the pressure supplied to the step portion 43, and the area and pressure of the step portion 43 may be adjusted so as to be larger than the gravity due to the weight of the fan 41. .. Compared with the chamfered shape of the first embodiment and the second embodiment, the stepped structure has better workability, so that a very accurate area can be obtained. However, since burrs appear on the corners 44 on the fan end face side of the stepped portion, it is necessary to remove the burrs in order to stably float the fan 41. By chamfering the corner portion 44, this problem can be solved, but man-hours are required, which increases the cost. It should be noted that stepped portions may be provided at both ends, and when the fan 41 is set in the balance measuring device 15 (see FIG. 2), either the upper or lower surface may be set on the lower side, so that workability is improved. do. However, there is a demerit that it takes a long time to process.

In the rotary electric machine according to the third embodiment of the present invention, as shown in FIG. 10, the following configuration is applied to the configuration according to the first embodiment described above.
A stepped portion made of a stepped portion 43 having a predetermined pressure receiving area is provided at at least one end face corner portion of the through-hole portion TH made of the hole 42 of the fan 41 corresponding to the fan 7 in the first embodiment. It is characterized by.
With this configuration, it is possible to obtain a rotary electric machine capable of performing a balance test on the fan 41 constituting the rotary electric machine by a simple configuration means and improving workability.

Embodiment 4.
Embodiment 4 according to the present invention will be described with reference to FIG. FIG. 11 is a vertical cross-sectional view showing the fan 45 of the rotary electric machine according to the fourth embodiment. A bush 46 is assembled as a separate part in the through-hole portion TH formed by the holes of the fan 45. When the fan 45 is a molded product, the bush 46 is combined by integrally molding with the fan. If the fan 45 is not a molded product, it is combined by press fitting. Even if it is a molded product, the bush 46 may be press-fitted into the fan 45. The bush 46 has a through-hole portion made of a hole 47, and its central axis is the same as the through-hole portion TH made of a hole of the fan 45. One of the end face corners of the through-hole portion formed by the hole 47 of the bush 46 is chamfered to form the chamfered portion 51. The chamfered shape of the chamfered portion 51 is C chamfered in the fourth embodiment. The bush 46 is made of a material that has better workability than the fan 45. As a result, the chamfered portion 51 can be machined with high accuracy by post-cutting.

Further, when the fan 45 is fixed to the drive shaft 5 of the rotary electric machine by tightening the nut, if the fan is made of a flexible material such as resin, the fan is deformed by the nut and a sufficient tightening force cannot be obtained. Therefore, if the bush is inserted into the fan and the bush is tightened with a nut, the fan will not be deformed and a sufficient tightening force can be obtained. The bush is made of a hard material such as iron, but its volume is much smaller than that of a fan, so the effect of the increase in mass due to the bush is small. The chamfered portions 51 may be provided at both ends of the bush, and when the fan 45 is set in the balance measuring device 15 (see FIG. 2), either the upper or lower surface may be set on the lower side. Gender improves.

In the rotary electric machine according to the fourth embodiment of the present invention, as shown in FIG. 11, the following configuration is applied to the configuration according to the first embodiment described above.
A mounting part as a separate part made of a bush 46 is installed in a through-hole portion TH made of a hole provided in a fan 45 corresponding to the fan 7 in the first embodiment, and the mounting part is a through-hole made of a hole 47. Chamfered portion 51 having a portion and forming a pressure receiving plane having a predetermined pressure receiving area at at least one end face corner portion of the insertion hole portion formed of the hole 47 of the mounting component made of the bush 46. It is characterized in that a chamfered portion made of is provided.
With this configuration, it is possible to obtain a rotary electric machine capable of performing a balance test on the fan 45 constituting the rotary electric machine by a simple configuration means and improving workability.

Embodiment 5.
Embodiment 5 according to the present invention will be described with reference to FIG. FIG. 12 is a vertical sectional view showing a fan 48 constituting the rotary electric machine according to the fifth embodiment. A bush 49 is assembled as a separate part in the through-hole portion TH formed by the holes of the fan 48. When the fan 48 is a molded product, the bush 49 is combined by integrally molding with the fan 48. If the fan 48 is not a molded product, it is combined by press fitting. Even if it is a molded product, the bush 49 may be press-fitted into the fan 48. The bush 49 has a through-hole portion made of a hole 47, and its central axis is the same as the through-hole portion TH made of a hole of the fan 48. One of the end face corners of the hole 47 of the bush 49 is chamfered to form a chamfered portion 50. The chamfered shape of the chamfered portion 50 is R chamfered in the fifth embodiment. It should be noted that chamfered portions may be provided at both ends of the bush, and when the fan 48 is set in the balance measuring device 15 (see FIG. 2), either the upper or lower surface may be set on the lower side, so that workability is possible. Improves.

In the rotary electric machine according to the fifth embodiment of the present invention, as shown in FIG. 12, the following configuration is applied to the configuration according to the first embodiment described above.
A mounting component made of a bush 49 as a separate part is housed in the through-hole portion TH of the fan 48 corresponding to the fan 7 in the first embodiment, and the mounting part has a through-hole portion made of a hole 47. A chamfered portion made of a chamfered portion 50 formed by R chamfering is provided at at least one end face corner portion of the insertion hole portion made of the hole 47 of the mounting component to form an arc-shaped curved surface having a predetermined pressure receiving area. It is characterized by being.
With this configuration, it is possible to obtain a rotary electric machine capable of performing a balance test on the fan 48 constituting the rotary electric machine by a simple configuration means and improving workability.

Embodiment 6.
Embodiment 6 according to the present invention will be described with reference to FIG. FIG. 13 is a vertical sectional view showing a fan 52 constituting the rotary electric machine according to the fifth embodiment. A bush 53 is assembled as a separate component in the through-hole portion TH formed by the holes of the fan 52. When the fan 52 is a molded product, the bush 53 is combined by integrally molding with the fan 52. If the fan 52 is not a molded product, it is combined by press fitting. Even if it is a molded product, the bush 53 may be press-fitted into the fan 52. The bush 53 has a through-hole portion made of a hole 47, and its central axis is the same as the through-hole portion TH made of a hole of the fan 52.

One of the holes 47 of the bush 53 has a stepped structure. The force for floating the fan is given by the product of the area of the step portion 43 and the pressure supplied to the step portion 43, and the area and pressure of the step portion 43 may be adjusted so as to be larger than the gravity due to the weight of the fan. Compared with the chamfered shapes of the fourth and fifth embodiments, the stepped structure has better workability, so that a very accurate area can be obtained. However, since burrs appear on the corners 44 on the fan end face side of the stepped portion, it is necessary to remove the burrs in order to stably float the fan. By chamfering the corner portion 44, this problem can be solved, but man-hours are required, which increases the cost. It should be noted that stepped portions 43 may be provided at both ends, and when the fan is set in the balance measuring device, either the upper or lower surface may be set on the lower side, so that workability is improved. However, there is a demerit that it takes a long time to process.

In the rotary electric machine according to the sixth embodiment of the present invention, as shown in FIG. 13, the following configuration is applied to the configuration according to the first embodiment described above.
A mounting component as a separate component is installed in the penetration hole TH of the fan 52 corresponding to the fan 7 in the first embodiment, and the mounting component has a penetration hole portion, and the mounting component has the penetration hole portion. It is characterized in that at least one end face corner portion 44 of the insertion portion is provided with a stepped portion composed of a stepped portion 43 having a predetermined pressure receiving area.
With this configuration, it is possible to obtain a rotary electric machine capable of performing a balance test on the fan 52 constituting the rotary electric machine by a simple configuration means and improving workability.

In the present invention, the embodiments can be freely combined, and the embodiments can be appropriately modified or omitted within the scope of the invention.

1 rotary electric machine, 2 frames, 3 stators, 4 rotors, 5 drive shafts, 6 rotor cores, 7 fans, 8 bearings, 9 springs, 10 housings, 11 cutting marks (rotor core), 12 cutting marks (fans), 13 holes , 14 chamfer, 15 balance measuring device, 16 vibrating bridge, 17 support spring, 18 support journal, 19 axial hole, 20 supply port, 21 horizontal hole, 22 shoulder, 23 hole (support journal), 24 Inner surface of fan hole, 25 gap, 26 upstream, 27 outlet, axially projected surface of SA chamfer, 29 air nozzle, 30 air flow, 31 plate, 32 auxiliary hole, 33 plate upper surface, 34 annular flow path, 35 supply port (secondary hole), 36 electric vacuum cleaner, 37 fan (embodiment 2), 38 hole (embodiment 2), 39 chamfered portion (R chamfer), 40 end face, 41 fan (embodiment 3) , 42 holes (Embodiment 2), 43 steps, 44 corners, 45 fans (Embodiment 4), 46 bushes, 47 holes (bush), 48 fans (Embodiment 5), 49 bushes (Embodiment 5). 5), 50 chamfered portion (5th embodiment), 51 chamfered portion (4th embodiment) 52 fan (6th embodiment), 53 bush (6th embodiment).

Claims (14)

A through-hole portion inserted by the drive shaft is provided with a fan fitted to the drive shaft and mounted on the drive shaft, and the fan has a chamfered portion at at least one end face corner portion of the through-hole portion. Provided ,
In testing the balance of the fan, the chamfered portion is attached by fitting a support journal into the insertion hole portion of the fan that is not mounted on the drive shaft, and the support journal is attached to the support journal and the support journal. A rotary electric machine characterized in that it is supplied between a portion of a through-hole portion other than the chamfered portion and is pressurized by a fluid that floats the fan . A stator in which a coil is wound around a laminated iron core, a rotor having a drive shaft and composed of a rotor core, a frame to which the stator and the rotor are assembled, a fan mounted on the drive shaft, and the rotor. A pair of bearings that support the drive shaft between the core and the fan are provided, and there are cutting marks on the axial end of the rotor core and the outer peripheral surface of the fan, and the fan is the drive. The through-hole portion inserted by the shaft is inserted into the drive shaft and mounted on the drive shaft, and the fan has a chamfered portion at at least one end face corner portion in the through-hole portion.
In testing the balance of the fan, the chamfered portion is attached by fitting a support journal into the insertion hole portion of the fan that is not mounted on the drive shaft, and the support journal is attached to the support journal and the support journal. A rotary electric machine characterized in that it is supplied between a portion of a through-hole portion other than the chamfered portion and is pressurized by a fluid that floats the fan . The rotary electric machine according to claim 1 or 2, wherein the chamfered portion is C-chamfered so that the cross section is a straight line in the vertical cross-sectional view of the fan . The rotary electric machine according to claim 1 or 2, wherein the chamfered portion is formed so that the cross section is an arc-shaped curved surface in the vertical cross-sectional view of the fan . The rotary electric machine according to claim 1 or 2, wherein the chamfered portion is formed so that the cross section is stepped in the vertical cross-sectional view of the fan . A mounting component having a penetration hole portion is installed in the penetration hole portion of the fan, and at least one end face angle of the penetration hole portion of the mounting component is replaced with the chamfered portion in the penetration hole portion of the fan. The rotary electric machine according to claim 1 or 2, wherein the portion is provided with a chamfered portion. The rotary electric machine according to claim 6, wherein the chamfered portion is C-chamfered so that the cross section is a straight line in the vertical cross-sectional view of the fan . The rotary electric machine according to claim 6, wherein the chamfered portion is formed so that the cross section is an arc-shaped curved surface in the vertical cross-sectional view of the fan . The rotary electric machine according to claim 6, wherein the chamfered portion is formed so that the cross section is stepped in the vertical cross-sectional view of the fan . An electric vacuum cleaner equipped with the rotary electric machine according to any one of claims 1 to 9. A through-hole portion inserted by the drive shaft is provided with a fan fitted to the drive shaft and mounted on the drive shaft, and the fan has a chamfered portion at at least one end face corner portion of the through-hole portion. In testing the balance of the fan of the provided rotary electric machine, the insertion hole portion of the fan not mounted on the drive shaft is fitted and attached to an upright support journal, and the support journal is used as described . A balance test of a rotary electric machine, characterized in that the chamfered portion is pressurized by a fluid supplied between the support journal and the portion of the through hole portion of the fan other than the chamfered portion so that the fan floats. Method. The support journal is projected onto the upper surface of a base provided in the balance test apparatus, and a step of disposing the fan fitted to the support journal on the upper surface of the base and the support. A step of pressurizing the chamfered portion with a fluid supplied between the journal and the insertion hole portion of the fan to levitate the fan against the gravity of the fan, and the fan in a floating state. 11. The balance of a rotating electric machine according to claim 11 , further comprising a step of rotating and a step of detecting the balance characteristic of the fan according to a vibration state applied to the support journal by the fan in a floating and rotating state. Test method. A step of adjusting the balance of the fan based on the detection result of the balance characteristic of the fan detected by using the balance test method of the rotary electric machine according to claim 12, and driving the fan whose balance has been adjusted. A method of manufacturing a rotary electric machine having a process of attaching to a shaft. A method for manufacturing an electric vacuum cleaner, which comprises mounting a rotary electric machine manufactured by the method for manufacturing a rotary electric machine according to claim 13 on an electric vacuum cleaner.

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