JP5050538B2 - Motor cooling structure - Google Patents

Description

  The present invention relates to a cooling structure for a motor.

  In motors such as induction motors and permanent magnet motors, heat generated inside the motor during operation is cooled by ventilation (for example, see Patent Document 1).

  FIG. 5 is a schematic view showing an example of a conventional motor cooling structure. As shown in FIG. 5, a cooling fan 3 is provided on the encoder 2 side (hereinafter referred to as a load side) of the electric motor unit 1.

  The electric motor unit 1 penetrates the frame 4 formed in a substantially cylindrical shape as a storage body, a load-side bracket 5 and an anti-load-side bracket 6 that are respectively attached to openings at both ends of the frame 4, and the frame 4. A shaft 9 rotatably supported in the frame 4 via bearings 7, 8 provided on the side bracket 5 and the anti-load side bracket 6; a rotor 10 fitted on the shaft 9 and rotating together with the shaft 9; The frame 4 is composed of a rotor 10 and a stator 11 disposed via a gap.

  The load side bracket 5 is intermittently provided with a plurality of cooling air inlets 13 drilled so as to allow communication between the inside and outside of the frame 4 in the circumferential direction. The cooling air inlet 13 is disposed at a position facing the coil end 12 located on the load side of the stator 11. The anti-load side bracket 6 is intermittently provided with a plurality of cooling air discharge ports 15 formed in a portion facing the coil end 14 located on the anti-load side of the stator 11 so as to allow communication between the inside and outside of the frame 4 in the circumferential direction. Provided.

  Further, the rotor 10 has a rotor air hole 16 penetrating along the axial direction at a predetermined distance from the outer peripheral surface. The rotor air holes 16 are provided intermittently in the circumferential direction. Further, the inner circumferential wall of the frame 4 is provided with a ventilation groove 17 which is recessed along the axial direction and formed so as to allow communication between the load side and the anti-load side space in the circumferential direction. The encoder 2 is fixed to the left end (load side) of the shaft 9 in the drawing.

  The cooling fan 3 is disposed on the opposite side of the electric motor unit 1 with the encoder 2 interposed therebetween. The rotation axis of the cooling fan 3 is coaxial with the shaft 9, and the cooling fan 3 blows air toward the motor unit 8 side.

  In the motor cooling structure shown in FIG. 5, the cooling air blown by the cooling fan 3 enters the inside of the frame 4 from the cooling air inlet 13, and is discharged from the cooling air outlet 15 through the rotor air hole 16 or the ventilation groove 17. As a result, the inside of the motor, specifically, the coil ends 12 and 14 serving as heat sources are cooled.

  FIG. 6 is a schematic view showing another example of a conventional motor cooling structure. As shown in FIG. 6, the cooling fan 3 is fixed to the outer peripheral wall of the frame 4 so that the cooling air is blown toward the inside of the frame 4.

  A cooling air intake port 13 is formed in a portion of the frame 4 facing the cooling fan 3, and a cooling air discharge port 15 is formed in a portion of the counter load side bracket 6 facing the coil end 14. Other configurations are substantially the same as those shown in FIG. 5 and described above, and the same members are denoted by the same reference numerals, and redundant description is omitted.

  In the motor cooling structure shown in FIG. 6, the cooling air blown by the cooling fan 3 enters the inside of the frame 4 from the cooling air inlet 13 and is discharged from the cooling air outlet 15 through the rotor air hole 16. As a result, the inside of the motor, in particular, the coil ends 12 and 14 serving as heat sources are cooled. Such a configuration is also described in Patent Document 2.

  Further, in Patent Document 3, in an elevator hoisting machine including a steel wheel driven by a motor, a plurality of cooling fans are formed in a space formed by a dimensional difference between the outer diameter of the motor frame and the outer diameter of the steel wheel. The structure which provides is described.

JP-A-9-322479 Japanese Patent Laid-Open No. 48-99606 JP 2001-322780 A

  However, in the motor cooling structure such as Patent Documents 1 and 2 shown in FIGS. 5 and 7, the cooling fan 3 is fixed to the outside of the end face of the frame 4 or the cooling fan 3 is fixed to the outer peripheral wall of the frame 4. Therefore, there is a problem that the axial or radial width of the motor is increased, leading to an increase in the size of the motor.

  In addition, the configuration described in Patent Document 3 is useful when a space sufficient to accommodate the cooling fan can be maintained between the load connected to the motor and the outer diameter of the frame. When the space formed between the outer diameter and the outer diameter of the motor is smaller than that of the cooling fan, the width in the axial direction and the radial direction of the motor is increased, which may increase the size of the motor.

  In view of the above, an object of the present invention is to provide a motor cooling structure capable of reducing the size of the motor and improving the cooling performance.

A motor cooling structure according to a first aspect of the present invention for solving the above-described problem is a housing body comprising a cylindrical frame and a bracket attached to an end portion of the frame, and the housing body is rotatable via a bearing. In a cooling structure of a motor that cools an electric motor unit including a rotor fitted to a supported rotating shaft and a stator provided outside the rotor by blowing a cooling fan, the cooling fan includes the cooling fan Between the coil end protruding from the end of the stator core with respect to the radial direction of the rotating shaft and the rotating shaft, and between the end of the frame and the rotor with respect to the axial direction of the rotating shaft. A plurality of separately-excited fans that are arranged in between and are fixed to the bracket and discharge cooling air into the storage body .

  The motor cooling structure according to a second aspect of the present invention is the motor cooling structure according to the first aspect of the present invention, wherein the cooling fan is formed in the bracket, and the diameter of the cooling fan decreases toward the inside of the electric motor unit along the rotation axis direction. Cooling air is discharged from the axial center side of the rotating shaft to the radial direction of the rotating shaft, a direction inclined from the rotating shaft, and away from the rotating shaft, and into the housing It is characterized by doing.

  The motor cooling structure according to a third aspect of the present invention is the motor cooling structure according to the first or second aspect of the present invention, wherein the bracket is provided with a cooling air discharge port that is drilled to allow communication between the inside and outside of the motor. Features.

  A motor cooling structure according to a fourth aspect of the present invention is the motor cooling structure according to any one of the first to third aspects of the present invention, wherein the electric motor unit has the rotating body connected to the rotating shaft via the bearing. The cooling fan is arranged in a space formed between the coil end located on the opposite side of the one bearing to the rotor and the rotating shaft. It is characterized by.

  According to the motor cooling structure of the present invention described above, the cooling fan can be disposed between the coil end and the rotating shaft, so that the axial or radial dimension of the motor is not increased. A cooling fan is provided and the motor can be efficiently cooled. Further, the cooling fan is arranged on the inclined portion of the bracket, and the direction from the axial center side of the rotating shaft to the radial direction of the rotating shaft is inclined, away from the rotating shaft, and toward the inside of the housing. If the cooling air is discharged, the apparatus can be further downsized and the cooling performance can be improved.

  Furthermore, it is preferable that the cooling air can be efficiently flowed by providing a cooling air discharge port formed in the bracket constituting the housing so as to allow communication between the inside and outside of the motor. In addition, if a cooling fan is arranged in the space between the coil end located on the opposite side of the bearing and the rotating shaft of the motor that supports the rotating shaft with one bearing, the coil end and the rotating shaft are arranged. Since the space between the two can be used more effectively, the motor can be further downsized.

  The motor cooling structure according to the embodiment of the present invention will be described in detail in the following examples.

  Based on FIG.1 and FIG.2, the detail of the cooling structure of the motor which concerns on the 1st Example of this invention is demonstrated. FIG. 1 is a schematic view showing a cooling structure of a motor according to this embodiment, and FIG. 2 is a front view showing the inside of the frame of FIG. The motor cooling structure according to the present embodiment is applied to motors such as induction motors and permanent magnet type rotating machines.

  As shown in FIG. 1, the present embodiment is obtained by changing the shape of the load side bracket 5 and the arrangement of the cooling fan 3 with respect to the conventional configuration shown in FIG. 5 or FIG. In the present embodiment, the cooling fan 3 is such that an axial flow fan or the like passes through the impeller in the axial direction.

  The cooling fan 3 is fixed to an inclined portion 5 a formed on the load side bracket 5. The inclined portion 5 a is configured such that a portion of the load side bracket 5 that is located on the axial center side from the coil end 12 is reduced in diameter toward the anti-load side along the axial direction of the shaft 9. As a result, the inclined portion 5a protrudes into the space on the axial center side of the coil end 12. A plurality of cooling fans 3 are fixed to the inclined portion 5a.

  The cooling fan 3 is disposed so that the axial direction of the rotating shaft is different from the axial direction of the shaft 9 by being fixed to the inclined portion 5 a. As a result, the cooling fan 3 is disposed in a state of being separated from the shaft 9 and the coil end 12 by a predetermined distance, and is in a direction orthogonal to the inclined portion 5 a and inside the frame 4, that is, the axis of the coil end 12. The cooling air is discharged from the side toward the anti-load side and radially outward.

  The inclined portion 5a is formed with a plurality of cooling air inlets 13 provided so as to allow communication between the inside and outside of the frame 4. The cooling air inlet 13 is provided intermittently in the circumferential direction. Further, a plurality of cooling air discharge ports 15a and 15b are intermittently formed in the circumferential direction at portions of the load side bracket 5 and the counter load side bracket 6 facing the coil ends 12 and 14, respectively.

  Further, as shown in FIG. 2, the rotor 10 is provided with a rotor air hole 16 penetrating along the axial direction at a predetermined distance from the outer peripheral surface. The rotor air holes 16 are provided intermittently in the circumferential direction. Further, the inner circumferential wall of the frame 4 is provided with a ventilation groove 17 which is recessed along the axial direction and formed so as to allow communication between the load side and the anti-load side space in the circumferential direction.

  Other configurations are generally the same as those shown in FIG. 5 or FIG. 6, and the same members are denoted by the same reference numerals, and redundant description is omitted.

  As indicated by arrows in FIG. 1, the cooling air discharged from the cooling fan 3 flows from the cooling air inlet 13 into the frame 4, cools the coil end 12, and then cools the coil end 12 to the frame. 4 after being discharged to the outside, or after cooling the coil end 12 through the ventilation groove 17 and discharged from the cooling air discharge port 15b to the outside of the frame 4, or after cooling the coil end 14 through the rotor air hole 16, The coil ends 12 and 14 are cooled while branching into a plurality of flow paths, such as being discharged from the cooling air discharge port 15b to the outside of the frame 4.

  According to the motor cooling structure of the present embodiment, the cooling fan 3 is arranged in the axial center side of the coil end 12, that is, in the space inside the coil end 12, and the rotation axis of the cooling fan 3 is the shaft 9. By adopting a configuration that inclines in different directions, the axial or radial dimension of the motor can be reduced as compared with the prior art, and the cooling air discharged from the cooling fan 3 is indicated by the arrow in FIG. Since the air is directly blown to the coil end 12 side which is a heat source as shown by, cooling efficiency can be further improved.

  In this embodiment, the cooling fan 3 is fixed to the inclined portion 5a formed on the load side bracket 5. However, the cooling fan 3 is provided in the space between the coil end 12 and the shaft 9 in the coil end 12 or the like. Needless to say, various modifications are possible without departing from the spirit of the present invention.

  The motor cooling structure according to the second embodiment of the present invention will be described in detail with reference to FIGS. FIG. 3 is a schematic view showing the motor cooling structure according to the present embodiment with a part broken away, and FIG. 4 is a front view of FIG.

  The motor shown in FIGS. 3 and 4 is an example of a motor having a permanent magnet as a magnetic pole inside the rotor, for example, a built-in motor, and does not have a receiver on the cooling fan 3 side, and supports the rotating shaft by one bearing. It is a so-called cantilever support motor.

  As shown in FIGS. 3 and 4, in this embodiment, the cooling fan 3 is provided on the non-load side (left side in FIG. 3) of the electric motor unit 101. In addition, the cooling fan 3 shall be provided with the structure substantially the same as what was demonstrated in Example 1 mentioned above, and detailed description is abbreviate | omitted.

  The electric motor unit 101 includes a frame 104 that is formed in a substantially cylindrical shape as a storage body, a load-side bracket 105 and an anti-load-side bracket 106 that are attached to openings at both ends of the frame 104, and a load side in the frame 104. A shaft 109 rotatably supported in the frame 104 via a bearing (not shown) fixed to the bracket 105; a rotor 110 fitted to the shaft 109 and rotated together with the shaft 109 and provided with a permanent magnet 118; The rotor 110 is fixed to the outside of the rotor 110 via a gap, and includes a stator 111 having a coil.

  In the present embodiment, there is no bearing on the side opposite to the load of the electric motor unit 1 where the cooling fan 3 is arranged, and the portion on the shaft 109 side of the rotor 110 is axial in comparison with the outer peripheral side including the permanent magnet 118. The width is narrow. For this reason, a wider space is formed between the coil end 112 and the shaft 109 than in the first embodiment. The rotor 110 has a rotor air hole 116 penetrating along the axial direction at a predetermined distance from the outer peripheral surface. The rotor air holes 116 are provided intermittently in the circumferential direction.

  Further, the load side bracket 105 is intermittently provided with a plurality of cooling air discharge ports (not shown) that are formed so as to be able to communicate with the inside and outside of the frame 104 in the same manner as the cooling air discharge port 15a shown in FIG. It has been. In addition, a plurality of cooling air discharge ports 115b drilled so as to allow communication between the inside and the outside of the frame 104 are provided intermittently in the circumferential direction at a portion facing the coil end 112 of the anti-load side bracket 106.

  Furthermore, an inclined portion 106 a is formed on the anti-load side bracket 106. The inclined portion 106a is configured such that the diameter of the portion positioned on the axial center side of the coil end 112 of the anti-load side bracket 106 is reduced toward the anti-load side along the axial direction of the shaft 109. As a result, the inclined portion 106a protrudes into the space on the axial center side of the coil end 112. A plurality of cooling fans 3 are fixed to the inclined portion 106a, and a plurality of cooling air inlets 113 are provided so as to be able to communicate between the inside and the outside of the frame 104.

  Although not shown, a ventilation groove formed in the inner peripheral wall of the frame 104 so as to be recessed along the axial direction in the same manner as in the first embodiment so that the space on the load side and the anti-load side can communicate with each other in the circumferential direction. You may provide intermittently.

  In the present embodiment, the motor does not have a bearing on the side opposite to the load where the cooling fan 3 is provided, and the space on the shaft 109 side of the rotor 110 is widened. The space for accommodating the cooling fan 3 can be set wider than that of the first embodiment.

  Thereby, the cooling fan 3 discharges cooling air to the inclined portion 106a of the anti-load side bracket 106 on the axial center side of the coil end 112 in the direction perpendicular to the inclined portion 106a inside the frame 104. And a part of the space is accommodated in the space inside the rotor 110.

  The cooling air discharged from the cooling fan 3 flows from the cooling air inlet 113 into the frame 104 and is discharged from the cooling air outlet 115b to the outside of the frame 104, or from the cooling air inlet 113 to the inside of the frame 104. It flows through a ventilation groove (not shown) and is discharged from the cooling air discharge port formed in the load side bracket 105 to the outside of the frame 104 or flows from the cooling air suction port 113 to the inside of the frame 104 and passes through the rotor air hole 116. The coil end 112 and the like are cooled while being branched into a plurality of flow paths, such as being discharged from the cooling air discharge port b of the load side bracket to the outside of the frame 104.

  According to the motor cooling structure according to the present embodiment, since the motor unit 101 does not have a bearing on the cooling fan 3 side, the shaft of the coil end 112 is compared to the first embodiment in which the bearing 7 is provided on the cooling fan 3 side. The space on the 109 side can be used more effectively, and the motor can be further miniaturized. Further, by expanding the space in which the cooling fan 3 is accommodated, for example, compared to the first embodiment, it is possible to install a larger cooling fan 3 while maintaining the outer diameter of the motor. The cooling performance can be further improved.

  The present invention can be applied to a motor cooling structure that cools the inside of the motor with a cooling fan.

It is a schematic sectional drawing which shows the cooling structure of the motor which concerns on Example 1 of this invention. It is a schematic sectional drawing which shows the cooling structure of the motor which concerns on Example 2 of this invention. It is a schematic sectional drawing which shows the cooling structure of the motor which concerns on the other Example of this invention. FIG. 4 is a front view of FIG. 3. It is a schematic sectional drawing which shows the cooling structure of the conventional motor. It is a schematic sectional drawing which shows the cooling structure of the other conventional motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Electric motor part 2 Encoder 3 Cooling fan 4,104 Frame 5,105 Load side bracket 5a, 105a Inclined part 6,106 Anti-load side bracket 7,8 Bearing 9,109 Shaft 10,110 Rotor 11,111 Stator 12, 14, 112 Coil end 13, 113 Cooling air inlet 15, 15a, 15b, 115b Cooling air outlet 16, 116 Rotor air hole 17 Ventilation groove 118 Permanent magnet

Claims (4)

A storage body comprising a cylindrical frame and a bracket attached to an end of the frame; a rotor fitted to a rotary shaft supported rotatably on the storage body via a bearing; and In the cooling structure of the motor that cools the electric motor part provided with the stator provided on the outside by the ventilation of the cooling fan,
The cooling fan is between the coil end protruding from the end of the stator core with respect to the radial direction of the rotating shaft and the rotating shaft , and the end of the frame with respect to the axial direction of the rotating shaft. A cooling structure for a motor, wherein the cooling structure is a plurality of separately-excited fans that are disposed between the rotor and the rotor, are fixed to the bracket, and discharge cooling air into the housing . The cooling fan is formed on the bracket, and is fixed to an inclined portion whose diameter is reduced toward the inside of the electric motor portion along the rotation axis direction,
The cooling air is discharged from the axial center side of the rotating shaft to a direction in which the radial direction of the rotating shaft is inclined and away from the rotating shaft, and to the inside of the storage body. Item 2. A motor cooling structure according to Item 1.   3. The motor cooling structure according to claim 1, wherein the bracket is provided with a cooling air discharge port formed so as to allow communication between the inside and outside of the motor. The electric motor unit has a structure in which the storage body supports the rotating shaft via one bearing.
The cooling fan is arranged in a space formed between the coil end located on the opposite side of the rotor from the one bearing and the rotating shaft. The motor cooling structure according to claim 3.

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