JP2006042543A - Induction motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: in an induction motor in which an end ring portion of a rotor core consisting of a laminated electromagnetic steel plate is constructed out of a plurality of protrusion portions, a temperature rise in windings of a rotor and a stator becomes high because the air in the induction motor cannot be circulated by only the protrusion portions of the end ring portion. <P>SOLUTION: This induction motor includes a plurality of through-holes 5 in the rotor 2 consisting of the laminated electromagnetic steel plate, and a plurality of blade pieces 6 and 8 near the through-holes 5. As a result, the air in the induction motor can be circulated, thus constructing the induction motor with a simple structure, at a low-cost, and with improved cooling performance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat dissipation structure for a rotor of an induction motor used in an air conditioner or the like.

Conventionally, in this type of induction motor rotor, as shown in FIG. 8, the end ring portion 102 of the rotor 101 made of laminated electromagnetic steel sheets is composed of a plurality of protrusions 103 (see, for example, Patent Document 1).
JP 2000-60045 A

  However, in the conventional configuration, the air in the induction motor cannot be circulated only by the protrusion 103 of the end ring portion 102, and thus there is a problem that the temperature rise of the rotor and stator windings is increased. .

  The present invention solves the above-mentioned conventional problems, and a rotor made of laminated electromagnetic steel sheets has a plurality of through holes on one side or both sides, and has a plurality of blade pieces in the vicinity of the through holes. An object of the present invention is to provide an induction motor that can circulate air in an electric motor, is inexpensive with a simple configuration, and has improved cooling performance.

  In order to solve the conventional problems, an induction motor according to the present invention is sandwiched between a rotor made of laminated electromagnetic steel plates that are freely rotatably supported via a bearing, a bracket that holds the bearing, and the bracket. An induction motor having a stator, wherein the rotor has a plurality of through holes on one side or both sides, and a plurality of blade pieces in the vicinity of the through holes. Moreover, the heat dissipation effect is further improved by changing the attachment position and the attachment angle of the blade pieces.

  The rotor of the induction motor according to the present invention has a plurality of through holes on one side or both sides, and a plurality of blade pieces in the vicinity of the through holes, so that the inside of the induction motor is formed by the plurality of through holes and blade pieces. Air can be circulated through the through hole by the blade piece. As the air circulates, the temperature of the rotor and stator windings can be lowered. Further, by changing the attachment position and the attachment angle of the blade pieces, the circulation efficiency is further increased and the heat dissipation effect is improved.

  1st invention is the induction motor which has the rotor which consists of a laminated electromagnetic steel plate hold | maintained freely via a bearing, the bracket holding the said bearing, and the stator pinched | interposed by the said bracket, The rotor has a plurality of through holes on one side or both sides, and a plurality of blade pieces in the vicinity of the through holes. The air in the induction motor can be circulated through the through hole by the blade piece by the plurality of through holes and the blade piece. As the air circulates, the temperature of the rotor and stator windings can be lowered.

  According to the second aspect of the present invention, the air circulation efficiency is increased by adopting a structure in which the blade pieces are attached to the front and rear of the through hole with respect to the rotation direction of the rotor, thereby further reducing the temperature of the rotor and stator windings. it can.

  According to the third aspect of the present invention, the air circulation efficiency is further increased by adopting a structure in which the angle of the blade piece is changed with respect to the rotation direction of the rotor, and the temperature of the rotor and stator windings can be further decreased. .

  According to the fourth aspect of the present invention, the shape of the blade piece can be freely changed by configuring the blade piece with heat-resistant resin, etc., and the air circulation efficiency can be further improved, and the temperature of the rotor and stator windings can be reduced. it can.

  According to the fifth aspect of the present invention, the blade piece can be formed with an inexpensive configuration by forming the blade piece from both side surfaces of the laminated electromagnetic steel sheets.

  6th invention is the air conditioner which used the induction motor of said invention of 1-5 for the outdoor unit. The outdoor unit of the air conditioner becomes high temperature by the heat exchanger during cooling operation, and high temperature wind hits the induction motor by the blower fan, and the internal temperature of the induction motor increases. The induction motor rotor has a plurality of through holes on one side or both sides, and a plurality of blade pieces in the vicinity of the through holes, whereby air in the induction motor circulates through the through holes by the blade pieces. be able to. As the air circulates, the temperature of the rotor and stator windings can be lowered.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a partial cross-sectional view of an induction motor according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of a rotor, and FIG. 3 is an end view of the rotor. In these drawings, a rotor 2 made of a laminated electromagnetic steel plate that is rotatably held by a bearing 1, a bracket A3, B4 that holds the bearing 1, and a winding of a stator that is sandwiched between the brackets A3, B4. 7, the rotor 2 has four through holes 5 having a diameter of 10 mm, and a blade piece 6 having a height of 8 mm and a width of 10 mm in the vicinity of the through hole 5. By rotating the rotor 2 times, the air in the induction motor hits the blade piece 6 and circulates through the through hole 5, and the air circulates, thereby lowering the temperature of the rotor 2 and the winding 7 of the stator. it can.

(Embodiment 2)
FIG. 4 shows a cross-sectional view of the second embodiment of the present invention. In FIG. 4, the attachment positions of the blade pieces A6a and B8b are changed by the flow of air. For example, if air flows from the output shaft side to the non-output shaft side and the rotation direction is clockwise when viewed from the output shaft, the blade piece A6a on the output shaft side is located below the through hole 5a. Further, the blade piece B8b on the side opposite to the output shaft is on the upper side when viewed from the output shaft. As the rotor 2a rotates, air easily strikes the blade piece 6a, passes through the through hole, and easily flows from the output shaft side to the counter-output shaft side. The air circulation efficiency can be increased by attaching the blade pieces A6a and B8b separately according to the flow of air. By increasing the circulation efficiency, the temperature of the rotor 2a and the stator winding 7 can be lowered.

(Embodiment 3)
FIG. 5 shows a sectional view of the third embodiment of the present invention. In FIG. 5, the actual form 1 is different from the blade piece in angle, and the other points are the same as those in the first embodiment. The blade pieces A6b and B8b of Embodiment 3 are structured to be inclined by 45 ° with respect to the rotation direction. By inclining the blade pieces A6b and B8b, the air circulation efficiency can be further increased. By increasing the circulation efficiency, the temperature of the rotor 2b and the stator winding 7 can be lowered.

(Embodiment 4)
FIG. 6 shows a cross-sectional view of Embodiment 4 of the present invention. In FIG. 6, by forming the blade pieces A6c and B8c with heat-resistant resin, a semicircular shape can be obtained. The shape of the blade piece can be freely changed by the heat resistant resin, and the air circulation efficiency can be further improved. By increasing the circulation efficiency, the temperature of the rotor 2c and the stator winding 7 can be lowered.

(Embodiment 5)
FIG. 7 shows a sectional view of the fifth embodiment of the present invention. In FIG. 7, blade pieces A6d and B8d are formed by using a mold or the like on one side surface of the laminated electromagnetic steel sheets 9d. The blade pieces A6d and B8d can be formed with an inexpensive structure by using the electromagnetic steel sheet 9d.

(Embodiment 6)
The induction motors of Embodiments 1 to 5 are preferably used for outdoor units of air conditioners. The outdoor unit of the air conditioner becomes high temperature by the heat exchanger during cooling operation, and the wind blows on the induction motor by the blower fan, and the internal temperature of the induction motor rises. The induction motor rotor has a plurality of through holes on one side or both sides, and a plurality of blade pieces in the vicinity of the through holes, whereby air in the induction motor circulates through the through holes by the blade pieces. be able to. As the air circulates, the temperature of the rotor and stator windings can be lowered. When the induction motor of the present invention is used for an outdoor unit for an air conditioner, the effects of the present invention are more remarkably exhibited.

  As described above, the induction motor according to the present invention has a structure having a plurality of through holes and a plurality of blade pieces in the vicinity of the through holes, whereby the induction motor is constituted by the plurality of through holes and the blade pieces. The air inside can be circulated through the through hole by the blade piece. As the air circulates, the temperature of the rotor and stator windings can be lowered. Further, by changing the attachment position and the attachment angle of the blade pieces, the circulation efficiency is further improved and the heat dissipation effect is improved. Therefore, it is useful for applications such as outdoor motors for air conditioners.

Partial sectional view of the induction motor according to Embodiment 1 of the present invention. Sectional drawing of the rotor in Embodiment 1 of this invention End view of the rotor according to the first embodiment of the present invention Sectional drawing of the rotor in Embodiment 2 of this invention Sectional drawing of the rotor in Embodiment 3 of this invention End view of rotor in embodiment 4 of the present invention Sectional drawing of the rotor in Embodiment 5 of this invention Partial sectional view of a conventional induction motor

Explanation of symbols

1 Bearing 2 Rotor 3 Bracket A
4 Bracket B
5 Through hole 6 Blade A
7 Winding (stator)
8 Feather B
9d electrical steel sheet

Claims (6)

An induction motor having a rotor made of laminated electromagnetic steel plates that are rotatably held via a bearing, a bracket that holds the bearing, and a stator that is sandwiched by the bracket, and a plurality of penetrating through the rotor An induction motor comprising a hole and a structure having a plurality of blade pieces on one side or both sides in the vicinity of the through hole. The induction motor according to claim 1, wherein a blade piece is attached to the front and rear of the through hole with respect to the rotation direction of the rotor. The induction motor according to claim 1, wherein the angle of the blade piece is changed with respect to the rotation direction of the rotor. The induction motor according to claim 1, wherein the blade piece is made of a heat-resistant resin. The induction motor according to claim 1, wherein the blade pieces are made of laminated electromagnetic steel sheets. An air conditioner using the induction motor according to any one of claims 1 to 5.

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