JP3606841B2 - Self-cooling motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-cooling motor, and more particularly to a self-cooling motor in which an air flow is generated by rotation of a rotor rotating in a stator and a motor case is cooled by the air flow.
[0002]
[Prior art]
As is well known, for example, a motor includes a stator for generating a rotating magnetic field and a rotor that rotates in the stator and follows the rotation of the rotating magnetic field, and extracts the rotation of the rotor to the outside. Although used as a power source, a coil for generating a rotating magnetic field is wound around the stator in order to generate the rotating magnetic field. Thus, when the load applied to the motor is large, a large current flows through the coil and the motor casing is overheated. For this reason, conventionally, a separate compressor is provided, and the motor is cooled by compressed air from the compressor.
[0003]
[Problems to be solved by the invention]
However, if the motor is to be used by being moved, the compressor must be carried along with it, and installation work at the site has been difficult.
[0004]
The present invention has been made in view of the above-described circumstances. In particular, the air flow is generated by the rotation of the rotor and is cooled by the air flow, so that it is not necessary to provide a separate compressor or the like. The object is to provide a motor that can be cooled.
[0006]
[Means for Solving the Problems]
The invention of claim 1 comprises a stator and a rotor that rotates within the stator, the rotor having a tubular sleeve integrally attached to the rotor, the tubular sleeve being axially disposed on an outer surface thereof. The groove is open at one end side of the tubular sleeve, and communicates in a loop with the adjacent groove at the other end side.
[0007]
The invention of claim 2 comprises a stator and a rotor rotating in the stator, the rotor having a tubular sleeve integrally attached to the rotor, the tubular sleeve being axially disposed on an outer surface thereof. A plurality of protrusions extending to the end of the tubular sleeve, the protrusions terminating at one end of the tubular sleeve, and being continuously folded back in a loop with the adjacent protrusions on the other end side. .
[0008]
The invention according to claim 3, consists of a rotor that rotates within the stator and the stator, the rotor has an outer surface that is integrally attached to the said rotor have a tapered tubular sleeve, said tubular sleeve, a groove having Article extending on its outer surface in the axial direction, the groove is open at the large diameter end of said tubular sleeve, Rukoto in communication with the adjacent grooves and the loop shape at the smaller diameter end It is characterized by.
[0010]
A fourth aspect of the present invention consists of a rotor that rotates within the stator and the stator, the rotor has an outer surface that is integrally attached to the said rotor has a tapered tubular sleeve, said tubular sleeve, has a projection number Article extending axially on its external surface,該Tokki terminates at the larger diameter end of the previous SL tube-like sleeve, in succession protrusion and loop adjacent the smaller diameter end It is characterized by being folded.
[0011]
The invention of claim 5 is to in any one of the claims 1 to 4, characterized by having a spiral groove or protrusion on the inner surface of the tubular sleeve.
[0012]
A sixth aspect of the present invention is the motor according to any one of the first to fifth aspects, wherein the motor is disposed in a sealed container, and an air flow generated between the stator and the rotor of the motor is the motor. It circulates through the gap between the outer casing of the motor and the sealed container.
[0013]
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, an introduction pipe for introducing external air is connected between the stator and the rotor of the motor and communicates with the outside between the outer casing and the sealed container of the motor. It is characterized in that a discharge pipe is connected.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram of an essential part for explaining an embodiment of a motor according to the present invention. FIG. 1 is a diagram in which a part of the motor 10 is cut away so that an internal rotor can be seen. A field winding 11a is wound around the stator 11, and a rotor 12 made of a permanent magnet is rotatably provided in a rotating magnetic field formed by the field winding 11a. As is well known, when the rotor-side field winding 11a is energized to generate a rotating magnetic field, the rotor 12 rotates following the rotating magnetic field. A spiral groove or protrusion is provided on the outer surface of the rotor 12. When the rotor 12 is rotated, an air flow in the direction of arrow B is generated, and the field current of the stator 11 is generated by this air flow. The heat generated by the field current flowing through 11a is removed.
[0015]
In FIG. 1, reference numeral 13 denotes a sleeve made of a tubular nonmagnetic material (for example, made of synthetic resin) attached to the rotor 12, and a spiral groove 13 a is provided on the surface of the tubular sleeve 13. Therefore, when a rotating magnetic field is generated by energizing the field winding 11 a of the stator 11, the rotor 12 rotates in the same manner as a conventionally known motor. When an air flow is generated in the groove 13a of the sleeve 13 and the rotor 12 rotates in the direction of arrow A, an air flow in the direction of arrow B is generated in the groove 13a, and the air between the stator 11 and the rotor 12 flows in the direction of arrow B. To be released. That is, the heat generated on the stator 11 side by energizing the field winding 11a of the stator 11 is released together with the air flow generated by the rotation of the rotor 12, and the motor 10 is not heated.
[0016]
Figure 2 is obtained by changing the tubular projection the formed groove (concave portion) 13a on the surface of the sleeve 13 (convex portion) 13b shown in FIG. 1, as shown in FIG. 2, the spiral in the tubular sleeve 13 ₁ Even if the protrusion 13b is formed, if the rotor 12 is rotated in the direction of arrow A, an air flow in the direction of arrow B is generated, and the heat rise of the motor can be suppressed.
[0017]
The embodiment shown in FIG. 2 shows an example in which a spiral groove is provided also on the inner wall surface on the stator 11 side. In the illustrated example, the spiral surface is formed on the inner surface of the non-magnetic tubular sleeve 14. Although an example in which the groove 14a is provided is shown, it can be easily understood that a protrusion may be provided instead of the groove. Note that the spiral groove or protrusion on the stator side is not necessarily required. If provided, the groove or protrusion is easy to flow in the same direction (B direction) as the air flow.
[0018]
According to the spiral groove or the spiral projection shown in FIGS. 1 and 2, if the rotation direction of the rotor 12 is reversed, the air flow direction is also reversed, and the motor is rotated in both forward and reverse directions. Inconvenient for.
[0019]
The embodiment shown in FIG. 3 is a principal configuration diagram for explaining an example in which an air flow in the same direction is always generated regardless of forward and reverse rotations of the rotor. In the case of this embodiment, the tubular sleeve 13 ₂ of the surface to be applied to the rotor 12, a groove 13a having Article extending in the axial direction of the sleeve 13 ₂ is provided, one end of the groove 13a, the sleeve 13 ₂ of the one end 13a _Opened on _one side and communicated in a loop with an adjacent groove on the other end 13a ₂ side. Therefore, in this case, an air flow is generated in the direction of arrow B regardless of whether the rotor 12 is rotated in the forward or reverse direction. Also in this case, as in the embodiment shown in FIG. 2, it may be a projection 13b in place of the groove 13a, in which case, the tubular sleeve _{13. 2,} the number shall be extended in the axial direction on the outer surface The projection has a projection (convex portion) 13b, and the projection terminates at one end of the tubular sleeve and is continuously folded in a loop with the adjacent projection on the other end.
[0020]
4, even when the motor is rotated normally and reversely, a view showing another embodiment that can be the direction of the air flow constant, in the embodiment shown in FIG. 4, the tubular sleeve 13 _3, outer surface is formed in a tapered shape, when rotated the tapered tubular sleeve 13 ₃ deposited on the rotor 12, the said tapered sleeve 13 _third surface, the small diameter side 13 3 _b larger diameter 13 ₃ Although an air flow B flowing to a is generated, the air flow direction B is the same even if the rotation direction of the rotor 12 is rotated forward and backward. In addition, it is possible to provide the groove 13a or the protrusion 13b extending in the axial direction as described with reference to FIG. _{3 on} the surface of the tapered tubular sleeve 133. In this way, the motor can be more effectively provided. Can be cooled.
[0021]
FIG. 5 is a schematic configuration diagram of an essential part showing an example of a case where a motor according to the present invention is sealed, in which 10 is a motor having a self-cooling function as described above, 20 is a casing for sealing the motor 10, 22 is a hermetic seal portion, and 23 and 24 are bearings for rotatably supporting the rotor 12. A gap G is provided between the outer casing of the motor 10 and the hermetic casing 20, as shown in the figure. As described above, the air flow generated between the stator 11 and the rotor 12 circulates through the gap G as indicated by the arrow, and the heat generated in the stator 11 is rotated by the rotation of the rotor 12. It can guide to the outside (gap G side) and can dissipate heat from the sealed casing 20. Such a sealed structure is suitable for the case where the motor is operated for a long time in a place where there is a lot of dust because dust from the outside is not sucked.
[0022]
FIG. 6 is a schematic diagram of a main part showing an example of the case where the sealed motor as described above is further effectively cooled. In FIG. 6, 20 is a casing in which the motor 10 is sealed as shown in FIG. Is a double tube (double tube), 40 is a filter, one of the double tubes 30 (for example, the outer tube 30) communicates with the inside of the motor 10, and the other (inner tube 31) is an outer casing of the motor 10 and a sealed casing. 20 communicates with the space between the two. If it does in this way, motor 10 can be cooled more effectively, without putting dust etc. in a motor.
[0023]
【The invention's effect】
As is apparent from the above description, according to the present invention, the motor overheat is effectively generated by utilizing the rotation of the motor, and the air flow is self-cooled. Cooling using compressed air from an external compressor, this external compressor is unnecessary and can be used alone, making it very easy to carry and install on site. .
[0024]
Moreover, since it can be easily attached to a conventional motor and does not add any processing to the motor itself, the cost is low.
Furthermore, for example, when a motor is used at high speed rotation, a strong air flow can be generated with a small number of grooves (grooves) and protrusions (protrusions). This is effective when applied to a small motor.
[Brief description of the drawings]
FIG. 1 is a partial cutaway configuration diagram for explaining an embodiment of a self-cooling motor according to the present invention.
FIG. 2 is a cross-sectional view of an essential part for explaining another embodiment of the self-cooling motor according to the present invention.
FIG. 3 is a diagram for explaining still another embodiment of the self-cooling motor according to the present invention, and is a configuration diagram of a rotor portion.
FIG. 4 is a diagram for explaining still another embodiment of the self-cooling motor according to the present invention, and is a diagram showing another configuration example of the rotor portion.
FIG. 5 is a main part configuration diagram for explaining a cooling function when the motor according to the present invention is disposed in a sealed container.
FIG. 6 is a configuration diagram for explaining an example of use of the self-cooling motor according to the present invention.
[Explanation of symbols]
10 ... motor, 11 ... stator, 11a ... field winding 12 ... _rotor, 13 1, ₁₃ 2, 13 3 _... rotor side tubular sleeve, 13a ... grooves (recesses) 13b ... projection (convex portion), DESCRIPTION OF SYMBOLS 14 ... Stator side tubular sleeve, 14a ... Spiral groove, 20 ... Sealed container (casing), 21, 22 ... Sealed seal part, 23, 24 ... Bearing, 30 ... Double pipe (double tube), 40 ... Filter .

Claims (7)

The rotor comprises a stator and a rotor that rotates within the stator, the rotor having a tubular sleeve integrally attached to the rotor, the tubular sleeve having several grooves extending axially on the outer surface thereof. The self-cooling motor is characterized in that the groove opens at one end side of the tubular sleeve and communicates with the adjacent groove in a loop shape on the other end side. The rotor comprises a stator and a rotor rotating in the stator, the rotor having a tubular sleeve integrally attached to the rotor, and the tubular sleeve extending in the axial direction on its outer surface. The self-cooling motor is characterized in that the protrusion terminates at one end of the tubular sleeve and is continuously folded back in a loop with the adjacent protrusion at the other end. It consists of a rotor that rotates within the stator and the stator, the rotor has an outer surface that is integrally attached to the said rotor have a tapered tubular sleeve, said tubular sleeve in the axial direction on the outer surface Self-cooling type characterized by having several extending grooves, the grooves being open at the large-diameter side end of the tubular sleeve and communicating with adjacent grooves at the small-diameter side end in a loop shape motor. Consists of a rotor that rotates within the stator and the stator, the rotor has an outer surface that is integrally attached to the said rotor has a tapered tubular sleeve, said tubular sleeve in the axial direction on the outer surface has a number of Article protrusions extending, characterized in that該Tokki terminates at the larger diameter end of the previous SL tube-like sleeve, is folded continuously in projection and loop adjacent the smaller diameter end self-cooled motor shall be the. The self-cooling motor according to any one of claims 1 to 4 , further comprising a spiral groove or protrusion on an inner surface of the tubular sleeve. A motor according to any one of claims 1 to 5, the motor is disposed in a sealed container, the closed air flow generated between the stator and the rotor of the motor is the envelope of the motor A self-cooling motor that circulates through a gap with a container. An introduction pipe for introducing external air is connected between a stator and a rotor of the motor, and a discharge pipe communicating with the outside is connected between the outer casing of the motor and a sealed container. 6. The self-cooling motor according to 6 .

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