JP2017180262A - Rotating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating device that can enhance cooling performance by a fan attached to a rotating shaft.SOLUTION: A rotating device comprises: a motor shaft 20; and a cooling fan 16 that rotates integrally with the motor shaft 20. The cooling fan 16 includes: a fan frame 30 fixed to the motor shaft 20; and blades 32 provided so as to protrude from the fan frame 30. The rotating device is configured so that a maximum amount of deflection of the blades 32 is equal to or larger than twice a minimum thickness of the blades 32 when a motor rotates at a rated speed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotating device.

  A rotating device in which a cooling fan is attached to a rotating shaft is known. In this rotating device, the rotating device body is cooled by blowing air to the rotating device body by a cooling fan. Conventionally, for example, a rotating device as described in Patent Document 1 has been proposed.

JP-A-11-289716

  According to the rotating device described in Patent Document 1, the rotating device main body can be cooled to some extent by the cooling fan attached to the rotating shaft. However, the demand for higher cooling performance does not cease.

  This invention is made | formed in view of such a condition, The objective is to provide the rotating apparatus which can improve the cooling performance by the cooling fan attached to the rotating shaft.

  In order to solve the above problems, a rotating device according to an aspect of the present invention is a rotating device including a rotating shaft and a cooling fan that rotates integrally with the rotating shaft. A fixed frame and a blade provided protruding from the frame. When the rotating device rotates at the rated rotation speed, the maximum deflection amount of the blade is configured to be twice or more the minimum thickness of the blade.

  Another embodiment of the present invention is also a rotating device. This device is a rotating device that includes a rotating shaft and a cooling fan that rotates integrally with the rotating shaft, and the cooling fan includes a frame that is fixed to the rotating shaft, and blades that protrude from the frame. ,including. The blade is made of a material having a Young's modulus lower than that of the frame.

  Note that any combination of the above-described constituent elements, and those obtained by replacing the constituent elements and expressions of the present invention with each other among methods, apparatuses, systems, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the rotating apparatus which can improve the cooling performance by the cooling fan attached to the rotating shaft can be provided.

It is a partially broken side view which shows the rotating apparatus which concerns on embodiment. It is a perspective view which shows the cooling fan of FIG. It is a figure which shows a mode that a blade | wing was bent when the motor of FIG. 1 rotated with a rated rotation speed. It is the figure which looked at the blade | wing of the cooling fan of FIG. 1, and its periphery from the circumferential direction. FIGS. 5A to 5C are views showing a cooling fan of a rotating device according to a modification. FIGS. 6A to 6C are views showing blades of a cooling fan of a rotating device according to a modification. It is a figure which shows the blade | wing of the cooling fan of the rotation apparatus which concerns on a modification, and its periphery.

  Hereinafter, the same or equivalent components and members shown in the respective drawings are denoted by the same reference numerals, and repeated descriptions thereof are omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in the drawings, some of the members that are not important for describing the embodiment are omitted.

  FIG. 1 is a partially broken side view showing a rotating device 10 according to an embodiment. FIG. 2 is a perspective view showing the cooling fan 16. The rotating device 10 includes a motor 12, a speed reducer 14 that decelerates the rotation of the motor 12, a cooling fan 16 that cools the motor 12, and a fan cover 18 that covers the cooling fan 16. The motor 12 is an electric motor. The speed reducer 14 is an orthogonal speed reducer in the present embodiment, and the input shaft is substantially orthogonal to the output shaft.

  The motor 12 includes a motor shaft 20, a motor frame 22, and a plurality of motor fins 24. The motor frame 22 includes a housing 26 and a bracket 28. The housing 26 is formed in a cylindrical shape. In the housing 26, a stator and a rotor (not shown) are accommodated, and the motor shaft 20 is attached to the rotor. The bracket 28 is coupled to the end of the housing 26 on the side opposite to the load (that is, the side opposite to the speed reducer 14).

  The motor fins 24 are provided on the outer periphery of the housing 26. In particular, the motor fins 24 are provided on the outer periphery of the housing 26 so as to extend along the extending direction (that is, the axial direction) of the motor shaft 20. The motor fins 24 may be formed integrally with the housing 26 or may be formed separately and then coupled to the housing 26. The motor fins 24 enhance the heat dissipation performance of the motor frame 22.

  The non-load side of the motor shaft 20 protrudes from the bracket 28. The cooling fan 16 is fixed to the opposite end portion of the motor shaft 20 protruding from the bracket 28. The cooling fan 16 rotates integrally with the motor shaft 20. The fan cover 18 is formed in a substantially cup-shaped predetermined shape, and is fixed to the motor frame 22 with the opening facing the motor 12 side. The fan cover 18 covers the cooling fan 16. The fan cover 18 has a plurality of air inlets 18a that are through holes.

  The cooling fan 16 includes a fan frame 30 and five blades 32. The fan frame 30 is made of resin, metal, or other material. The fan frame 30 includes a cylindrical portion 34 fixed to the motor shaft 20 and five support portions 36 extending radially outward from the cylindrical portion 34 in the radial direction.

  Each support part 36 is formed in a long shape. In this Embodiment, it forms so that the width | variety of the circumferential direction may become so narrow that the outer diameter side.

  Each blade 32 is provided so as to protrude from each support portion 36 toward the motor 12 side (that is, the main body side of the rotating device 10). The blade | wing 32 is formed in flat form, and is provided so that a main surface may face the circumferential direction. A main surface means a surface with the largest area among each surface of the blade | wing 32 formed in flat form. When the motor 12 rotates at the rated rotation speed, the blade 32 is configured to bend so that the front main surface in the rotation direction of the cooling fan 16 of the two main surfaces faces the motor 12 side due to air resistance. . Thereby, when the cooling fan 16 rotates, air is sent out in the axial direction in addition to the radially outer side. In the present embodiment, the blade 32 is mainly configured to be bent by forming the blade 32 with a material having low bending rigidity as described later.

  FIG. 3 shows a state in which the blade 32 is bent as the motor 12 rotates at the rated rotation speed. In FIG. 3, the figure which looked at one of the blade | wings 32 and its periphery from the radial direction outer side is shown. In FIG. 3, the display of the other four blades 32 is omitted. When the motor 12 rotates at the rated rotation speed of the blade 32, the amount of bending δ of the most bent portion is at least twice the thickness of the thinnest portion of the blade 32 (thickness in the circumferential direction (rotating direction)). It is configured as follows. Here, the amount of deflection δ is the position when the motor 12 is stopped at a point on the neutral line (surface) C passing through the center of the plate thickness of the blade 32 formed in a flat plate shape, and the motor 12 The distance in the radial direction of the cooling fan 16 with respect to the position when rotating. In the cooling fan 16 of the present embodiment, the point P at the tip of the blade 32 in the axial direction is most bent, so that the amount of deflection δ at the point P when the motor 12 rotates at the rated rotational speed is the highest of the blade 32. It is comprised so that it may become 2 times or more of the thickness of a thin part. The blade 32 is preferably configured such that when the motor 12 rotates at the rated rotation speed, the amount of bending δ of the most bent portion is 10 times or more the thickness of the thinnest portion of the blade 32. In other words, the blades 32 are preferably configured such that when the motor 12 rotates at the rated speed, the deflection angle θ of the most bent portion is 30 to 45 degrees. Here, the deflection angle θ is formed by a tangent line at a point on the neutral line C when the motor 12 is rotating and a neutral line C (that is, the axial direction) of the blade 32 when the motor 12 is not rotating. Say the corner. In the cooling fan 16 of the present embodiment, the point P at the tip of the blade 32 in the axial direction is most bent, so that the bending angle θ of the point P when the motor 12 rotates at the rated rotational speed is 30 to 45 degrees. Configured to be The rated rotational speed is generally set to about 1300 to 2000 rpm with a 4-pole motor.

  The blades 32 are formed from resin, metal, or other materials. In the present embodiment, the blades 32 are particularly formed of a material having a lower bending rigidity than the fan frame 30, that is, a material having a Young's modulus lower than that of the fan frame 30. What is necessary is just to determine the raw material employ | adopted for the blade | wing 32, the thickness of the blade | wing 32, etc. by experiment.

  FIG. 4 is a view of the blade 32 of the cooling fan 16 and its periphery as seen from the circumferential direction. The blade 32 has a weight portion in a region (region A surrounded by a dotted line) outside the center in the radial direction and outside the center in the axial direction (on the side of the anti-fan frame 30 and the side of the anti-supporting portion 36). It may be. The weight part means a part where the center of gravity of the blade 32 moves to the weight part side as compared with the case where there is no weight part due to the presence of the weight part. Specifically, for example, the weight portion refers to a portion where the thickness of the blade 32 is made thicker than other portions, or a weight attached to the blade 32. In the present embodiment, the blade 32 has a weight 40 as a weight part in the region A.

The operation of the rotating device 10 configured as described above will be described.
A drive current is supplied to the motor 12 and the motor shaft 20 rotates. When the motor shaft 20 rotates, the cooling fan 16 also rotates together with the motor shaft 20. At this time, the blade 32 of the cooling fan 16 is bent by air resistance so that the front main surface in the rotation direction of the cooling fan 16 faces the motor 12 side.

  When the cooling fan 16 rotates, air flows into the fan cover 18 from the air inlet 18 a of the fan cover 18. The air flowing in from the intake port 18a is sent out radially outward or axially by the cooling fan 16. The air sent to the outside in the radial direction strikes the fan cover 18, is deflected to an axial flow toward the load side, and is supplied to the motor fins 24 through a gap between the fan cover 18 and the bracket 28. Further, the air sent in the axial direction flows along the bracket 28 and is similarly supplied to the motor fins 24 through the gap between the fan cover 18 and the bracket 28.

  According to the rotating device 10 according to the embodiment described above, when the motor 12 is rotating at the rated rotation speed, the blade 32 of the cooling fan 16 bends so that the main surface slightly faces the axial direction. As a result, the air flowing into the fan cover 18 from the intake port 18a is sent out not only in the radial direction but also in the axial direction by the cooling fan 16. That is, a flow that is sent directly in the axial direction by the cooling fan 16 without the fan cover 18 is formed. As a result, the flow rate of the air supplied to the motor fins 24 through the gap between the fan cover 18 and the bracket 28 increases, and the performance of cooling the motor fins 24 and thus the rotating device is enhanced.

  Further, according to the rotating device 10 according to the embodiment, the blade 32 is provided so as to protrude from the support portion 36 toward the motor 12 side. Therefore, when the cooling fan 16 rotates with the rotation of the motor shaft 20, the blade 32 bends so that the main surface on the front side in the rotation direction of the cooling fan 16 of both main surfaces faces the motor 12. Accordingly, the blade 32 bends so that wind can be sent out to the motor 12 side in the axial direction regardless of which direction the motor shaft 20 rotates.

  Moreover, according to the rotating apparatus 10 which concerns on embodiment, the blade | wing 32 of the cooling fan 16 has a weight part in the area | region A. FIG. Thereby, when the motor 12 rotates, the outer diameter side of the blade 32 is bent more than the inner diameter side. That is, since the blade 32 bends in a twisted manner, the amount of air sent out in the axial direction is increased, and the cooling effect is improved.

  The inventor conducted an experiment using the rotating device 10 according to the embodiment and the rotating device according to the comparative example in order to confirm the effect of improving the cooling performance of the rotating device 10 according to the embodiment. The difference between the rotating device 10 according to the embodiment and the rotating device according to the comparative example is the configuration of the cooling fan. The cooling fan of the rotating device according to the comparative example is such that the blades are not substantially bent even when the motor rotates at the rated rotation speed, that is, the maximum deflection amount of the blades when the motor is rotating at the rated rotation speed. Is configured to be less than twice the minimum thickness. Further, the cooling fan of the rotating device according to the comparative example is provided such that each blade protrudes from each support portion toward the side opposite to the motor 12.

  Specifically, for each of the rotating device 10 according to the embodiment and the rotating device according to the comparative example, the motor is rotated at the rated rotation speed for 1 hour with the cooling fan removed, the motor is stopped, and the cooling fan is The motor was rotated at the rated rotational speed for another hour, and the temperature change at nine measurement points of the motor of the rotating device during that time was measured. According to this experiment, the temperature at each measurement point when the cooling fan was attached and the motor was rotated for 1 hour was 3.9 ° C. on average in the rotating device according to the embodiment as compared with the rotating device according to the comparative example. It was confirmed to be low. That is, it was confirmed that the rotating device according to the embodiment has higher cooling performance by the cooling fan than the rotating device according to the comparative example.

  The configuration and operation of the rotating device according to the embodiment have been described above. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective components, and such modifications are also within the scope of the present invention.

(Modification 1)
FIGS. 5A to 5C are views showing the cooling fan 16 of the rotating device according to the modification. 5A to 5C show views of the cooling fan 16 viewed from the axial direction. In FIG. 5, a case where there are four support portions 36 and four blades 32 will be described as an example.

  In this modification, the fan frame 30 includes an annular outer ring portion 38 that connects the tips of the support portions 36.

  5A shows a case where both side surfaces 36a of the support portion 36 are formed in an arc shape, and FIG. 5B shows a case where both side surfaces 36a of the support portion 36 are linearly parallel to each other on the inner diameter side. The radial side shows the case where it is formed in an arc shape, and FIG. 5C shows the case where both side surfaces 36a of the support portion 36 are formed in straight lines parallel to each other.

  In other words, in this modification, the fan frame 30 is formed in a disk shape, and is provided with the same number of intake ports 36b as the number of blades 32 arranged in the circumferential direction. That is, FIG. 5A shows a case where the circular fan inlet 30b is provided in the disk-shaped fan frame 30, and FIG. 5B shows a rectangular shape on the inner diameter side of the disk-shaped fan frame 30. The outer diameter side shows a case where a circular intake port 36b is provided, and FIG. 5C shows a case where a disk-shaped intake port 36b is provided in a disk-shaped fan frame 30.

  According to these modified examples, since the fan frame 30 includes the outer ring portion 38, the strength of the fan frame 30 can be sufficient even if the support portion 36 is thinned. In other words, according to these modified examples, the support portion 36 can be thinned. This makes it easier for the wind to directly hit the blades 32, and the blades 32 are easily bent. As a result, the wind is sent out more in the axial direction by the blade 32.

(Modification 2)
Although not specifically mentioned in the embodiment, various modifications can be considered for the shape of the blade 32.

  6A to 6C are views of the blades 32 of the cooling fan 16 of the rotating device according to the modification as seen from the circumferential direction. 6A and 6B, the inner diameter side has a relatively short axial length. In this case, when the cooling fan 16 rotates with the rotation of the motor 12, the outer diameter side receives air resistance, so that the outer diameter side bends better. That is, the blade 32 is bent so as to be twisted. In FIG. 6C, the axial position of the distal end portion on the inner diameter side of the blade 32 is substantially the same as the axial position of the distal end portion on the outer diameter side. That is, the axial length is relatively long on the inner diameter side. In this case, when the cooling fan 16 rotates with the rotation of the motor 12, more air can be sent out.

  FIG. 7 is a view of one of the blades 32 of the cooling fan 16 and the periphery thereof in the rotating device according to another modification as viewed from the outside in the radial direction. In FIG. 7, the display of the other blade | wing 32 is abbreviate | omitted. FIG. 7 shows a state where the rotating device is not rotating, that is, a state where the blades 32 of the cooling fan 16 are not bent. In this modification, the blades 32 are formed so that the thickness on the tip end side (the anti-fan frame 30 side, that is, the main body side of the rotating device 10) is thinner than the support portion 36 side (the fan frame 30 side, that is, the root side). Has been. In other words, the blades 32 are formed in a wedge shape. According to this modification, since the blade 32 is less likely to bend at the base side, the blade 32 is prevented from falling from the base so that the entire blade 32 sticks to the support portion 36 when the rotating device rotates at the rated rotation speed. it can.

(Modification 3)
In the embodiment, the case where the fan frame 30 and the blades 32 of the cooling fan 16 are made of different materials has been described. However, they may be made of the same material. In this case, by adjusting the thicknesses of the fan frame 30 and the blades 32, the fan frame 30 has sufficient rigidity, and the maximum deflection amount of the blades 32 is minimized when the rotating device 10 rotates at the rated rotational speed. What is necessary is just to be comprised so that it may be bent so that it may become 2 times or more (preferably 10 times or more) of thickness.

(Modification 4)
In the embodiment, the case where the rotating device 10 includes the motor 12 and the speed reducer 14 has been described, but the present invention is not limited thereto. The rotating device 10 may not include the speed reducer 14. A case where the rotating device 10 does not include the motor 12 is also conceivable. In this case, the cooling fan 16 may be fixed to the end of the input shaft of the speed reducer 14. The rotating device 10 is not limited to a motor or a speed reducer, and can be widely applied to various rotating devices having a rotating shaft and a cooling fan.

  Any combination of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiment generated by the combination has the effects of the combined embodiment and the modified examples.

  10 rotating device, 12 motor, 14 speed reducer, 16 cooling fan, 18 fan cover, 30 fan frame, 32 blades.

Claims (7)

A rotating device comprising: a rotating shaft; and a cooling fan that rotates integrally with the rotating shaft,
The cooling fan includes a frame fixed to the rotating shaft, and a blade provided protruding from the frame,
The rotating device is configured such that, when the rotating device is rotating at a rated rotational speed, the maximum deflection amount of the blade is at least twice the minimum thickness of the blade. A rotating device comprising: a rotating shaft; and a cooling fan that rotates integrally with the rotating shaft,
The cooling fan includes a frame fixed to the rotating shaft, and a blade provided protruding from the frame,
The rotating device is characterized in that the blade is made of a material having a Young's modulus lower than that of the frame.   The rotating device according to claim 1, wherein the blade is provided so as to protrude toward the rotating device main body side.   4. The rotating device according to claim 1, wherein the blade has a weight portion in a region outside the radial center and on the opposite side of the frame from the axial center. 5.   5. The rotating device according to claim 1, wherein the frame includes a support portion from which the blades protrude, and an outer ring portion that connects a tip of the support portion.   The rotating device according to any one of claims 1 to 5, wherein the blade has a tip side thinner than the frame side.   7. The blade according to claim 1, wherein the blade is bent so that a main surface on the front side in the rotation direction faces the rotating device main body when the rotating device rotates at a rated rotation speed. The rotating device according to 1.

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