JP2005057884A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor in which cooling effects of a stator core and a stator winding being wound around the stator core can be enhanced and a lifetime of the stator winding can be prolonged. <P>SOLUTION: The motor comprises a rotor 13 provided with fins 14, and a stator disposed oppositely to the rotor 13. An insulation bobbin 6 interposed between a stator core 1 and a stator winding 5 wound around the stator core 1 and insulating them is provided with a plurality of cooling grooves 15 communicating to the inner circumferential side and the outer circumferential side in the radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor having an insulating bobbin interposed between a stator core and a stator winding.

  Conventionally, a motor having a cooling mechanism has been proposed in order to dissipate heat generated when the motor is energized. For example, a technique has been proposed in which a fan is mounted on a rotor of a motor, and the fan is rotated integrally with the rotor so that air in the motor is stirred by the fan to cool the stator and rotor of the motor. (See Patent Document 1).

In addition, a technique for a motor provided with a guide plate for providing fins at the end of the rotor and guiding air to the cooling passage has been proposed (see Patent Document 2).
Further, as another technique, there is a technique for cooling the stator by forming a hole through which cooling air flows. In addition, the motor is formed in a hermetically sealed structure, and an appropriate amount of cooling liquid is filled therein, and the cooling liquid is agitated by a rotor, thereby cooling the stator winding wound around the stator by scattering the cooling liquid. Techniques to do this have also been proposed.
JP-A-10-336961 Japanese Patent Laid-Open No. 10-341556

  By the way, when cooling the motor, it is particularly important to cool the stator winding that generates heat when energized and the stator core to which the stator winding is mounted. However, in the conventional technique, as shown in FIG. 8, the stator core 31 is cooled from the stator winding 33 through the insulating member 32 by the cooling medium 34 such as cooling air or cooling liquid. For this reason, unless the thermal conductivity of the insulating member 32 is sufficiently high, there is a problem that the heat 35 of the stator core 31 cannot be sufficiently released to the outside and the cooling effect is low.

In the prior art, the outside of the stator winding 33 is cooled by the cooling medium 34, but the cooling medium 34 does not contact the inside of the stator winding 33, so There is a problem that the heat 36 cannot be sufficiently released to the outside, and the life of the stator winding 33 is shortened accordingly.
Accordingly, an object of the present invention is to provide a motor capable of enhancing the cooling effect of the stator core and the stator winding wound around the stator core and extending the life of the stator winding.

  The invention according to claim 1 is a motor including a rotor (for example, the rotor 13 in the embodiment) provided with fins (for example, the fin 14 in the embodiment) and a stator disposed to face the rotor. Insulating bobbins (for example, the stator core 1 in the embodiment) and the stator windings wound around the stator core (for example, the stator winding 5 in the embodiments) to insulate them (for example, A plurality of cooling passages (for example, the cooling groove 15 in the embodiment) communicating from the radially inner periphery side to the outer periphery side are formed in the insulating bobbin 6) in the embodiment.

According to this invention, when the rotor is driven to rotate, the fins can generate cooling air from the rotor to the stator, and the cooling air can be generated in the radial direction through the cooling passage of the insulating bobbin. It can be passed from the inner circumference side to the outer circumference side. Accordingly, the cooling air can cool the stator core and the inner peripheral side of the stator winding, which are difficult to dissipate heat, so that the cooling effect of the stator winding and the stator core can be enhanced, and the life of the stator winding can be increased. Can be prolonged.
Further, since it is not always necessary to use a material with high heat dissipation as the material of the insulating bobbin, the cost burden can be reduced correspondingly, and the degree of freedom in selecting the material can be increased.
Further, since the cooling air can be generated along with the rotation of the rotor, it is not necessary to provide a cooling device in particular, and the cost can be reduced in this respect.

  The invention according to claim 2 is the invention according to claim 1, wherein the insulating bobbin has an inner extension portion (for example, an embodiment) extending in the axial direction and the circumferential direction of the stator on the stator inner peripheral side. And the outer peripheral side extending portion extending in the axial direction and the circumferential direction of the stator on the outer peripheral side of the stator (for example, the yoke side extending portion 10 in the embodiment). In addition, a suction port of the cooling passage (for example, the suction port 17 in the embodiment) is formed in the inner peripheral side extension portion, and a discharge port of the cooling passage (for example, in the outer peripheral side extension portion, for example, A discharge port 18) in the embodiment is formed.

  According to the present invention, the suction port and the discharge port of the cooling passage are formed in the outer peripheral side extension portion and the inner peripheral side extension portion that extend in the axially inner peripheral side and the outer peripheral side, respectively. The mouth and the discharge port can be formed so as to expand with respect to the cooling passage. Thereby, since the cooling air can be introduced into the cooling passage in a larger amount, the cooling effect on the stator core and the stator winding can be enhanced. In addition, the cooling air that communicates with the suction port that is formed to be widened has a higher flow rate when passing through the cooling passage, so that the above-described cooling effect can be further enhanced.

The invention according to claim 3 is described in claim 2, wherein the insulating bobbin has an opening formed in the cooling passage on an axial side surface thereof (for example, the opening 16 in the embodiment). It is characterized by that.
According to the present invention, since the cooling air passing through the cooling passage can directly cool the stator winding and the stator core through the portion where the opening of the insulating bobbin is formed, the cooling effect of the stator core and the stator winding can be reduced. It can be further increased.

According to the first aspect of the present invention, since the cooling effect of the stator winding and the stator core can be enhanced, the life of the stator winding can be prolonged and the performance of the motor can be improved.
According to the second aspect of the present invention, a larger amount of the cooling air can be introduced into the cooling passage, so that the cooling effect on the stator core and the stator winding can be enhanced.
According to the invention described in claim 3, since the stator winding and the stator core can be directly cooled, the cooling effect of the stator core and the stator winding can be further enhanced.

  Hereinafter, a stator according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a stator core of a motor according to an embodiment of the present invention. As shown in the figure, the stator core 1 is formed in an annular shape by arranging a plurality of stator pieces 2 in the circumferential direction. Each stator piece 2 is formed with a plurality of magnetic pole teeth 3A projecting inward in the radial direction of the stator core 1 and a yoke portion 3B extending in the circumferential direction of the stator core 1, and fixed to the magnetic pole teeth 3A. A child winding (coil) 5 is wound.

In addition, a locking portion 4 that protrudes outward in the circumferential direction is provided at an end portion on the inner peripheral side of the magnetic teeth 3A to prevent a stator winding 5 described later from falling out inward in the radial direction. The stator piece 2 is formed by laminating electromagnetic steel plates having directionality such as silicon steel plates. For example, the magnetic teeth 3A are set so that the easy magnetization direction is the radial direction of the stator core 1, and the yoke portion 3B has the easy magnetization direction in the stator core 1. Is set in the circumferential direction.
A cylindrical insulating bobbin 6 is attached to the side surface of the magnetic pole teeth 3A arranged in an annular shape. In the present embodiment, the insulating bobbin 6 is configured by combining two insulating piece pieces 7 and 7 into a cylindrical shape.

  The insulating piece piece 7 includes a main body portion 8 having a substantially U-shaped cross-section covering the side surface of the magnetic teeth 3A, and teeth-side extending portions projecting from both ends of the main body portion 8 in the axial direction on the inner peripheral side and outer peripheral side of the stator. 9 and a yoke-side extension 10. The teeth side extension portion 9 is a portion extending along the locking portion 4 of the magnetic pole teeth 3A, and the yoke side extension portion 10 is a portion extending along the inner peripheral surface of the yoke portion 3B.

  The pair of insulating piece pieces 7 formed in this way is attached to the magnetic pole teeth 3A arranged in an annular shape. Specifically, the side surface of the magnetic teeth 3A is on the main body 8 of the insulating piece piece 7, the inner peripheral surface of the yoke portion 3B is on the yoke-side extension 10 of the insulating piece piece 7, and the engaging portion 4 of the magnetic teeth 3A. Are covered with the teeth side extending portions 9 of the insulating piece pieces 7, respectively.

  As shown in FIG. 2, the insulating piece piece 7 is formed with a plurality of cooling grooves 15 communicating from the inner peripheral side in the radial direction R to the outer peripheral side. The air in the rotor 13 can be sent out of the stator core 1 through the cooling groove 15. In addition, as shown in the figure, the cooling groove 15 is formed with an opening 16 that is opened on the side surface in the axial direction.

  The insulating bobbin 6 has a suction port 17 of the cooling groove 15 formed in the teeth side extension portion 9 and a discharge port 18 of the cooling groove 15 formed in the yoke side extension portion 10. Yes. As described above, since the teeth side extension portion 9 and the yoke side extension portion 10 extend in the circumferential direction as compared with the main body portion 8, the suction port 17 and the yoke side formed in the teeth side extension portion 9. The discharge port 18 formed in the extension part 10 can be formed so as to expand with respect to the cooling groove 15 formed in the main body part 8.

  In this state, the stator winding 5 made of a conductive wire such as copper is wound around the side surface of each magnetic pole tooth 3A in a concentrated manner. The body portion 8, the tooth side extension portion 9, and the yoke side extension portion 10 of the insulating bobbin 6 insulate the stator winding 5 from the side surfaces of the magnetic teeth 3 </ b> A, the locking portion 4, and the yoke portion 3 </ b> B inner peripheral surface. .

  On the other hand, on the inner peripheral side of the stator core 1, as shown in FIG. 3, a rotor 13 is provided at a position facing the radial direction. As shown in the figure, a substantially annular fin 14 is integrally attached to the rotor 13 on the end surface of the rotor 13. As a result, when the rotor 13 is driven to rotate, the fins 14 also rotate integrally with the rotor 13 to stir the air in the rotor 13 and generate the cooling air 19.

  The cooling process of the motor configured as described above will be described with reference to FIGS. 4 and 5 are explanatory views showing the flow of the cooling air 19 as seen from the radially inner side of the stator piece 2. 6 and 7 are explanatory views showing the flow of the cooling air 19 as viewed from the radially outer side of the stator piece 2. In these drawings, one of the stator pieces 2 constituting the stator is shown as an example, but the flow of the cooling air 19 is the same in other stator pieces.

  First, the cooling air 19 generated by the rotation of the fins 14 of the rotor 13 is supplied to the cooling groove 15 from the suction port 17 as shown in FIG. Here, by forming the opening area of the suction port 17 larger than the cross-sectional area of the cooling groove 15, the cooling air 19 can be introduced into the cooling groove 15 in a larger amount. Further, the flow velocity when the cooling air 19 passes through the cooling groove 15 can be increased.

  Then, as shown in FIG. 5, the stator winding 5 and the stator piece 2 are cooled from the inner peripheral side by the cooling air 19 passing through the cooling groove 15. As described above, since the cooling groove 15 has the opening 16 formed in the side surface in the axial direction of the insulating bobbin 6, the cooling air 19 passing through the cooling groove 15 is passed through the opening 16 through the stator. The winding 5 and the stator core 1 can be directly cooled, and the cooling effect of the stator core 1 and the stator winding 5 can be further enhanced.

As shown in FIGS. 6 and 7, the cooling air 19 that has passed through the cooling groove 15 is discharged to the outside of the stator core 1 from the discharge port 18 formed in the yoke side extension 10.
In FIG. 6, the stator piece 2 is not shown in order to clarify the flow of the cooling air 19.

  Thus, since the inner peripheral side of the stator core 1 and the stator winding 5 that are difficult to dissipate can be cooled, the cooling effect of the stator winding 5 and the stator core 1 can be enhanced, and the stator winding 5 Can prolong the lifespan. Further, since it is not always necessary to use a material with high heat dissipation as the material of the insulating bobbin 6, the cost burden can be reduced correspondingly, and the degree of freedom in selecting the material can be increased.

It is a top view of the stator of the motor in the 1st embodiment of the present invention. It is a perspective view of the insulation piece piece with which the magnetic pole teeth of a stator are attached. It is principal part explanatory drawing which shows the cooling structure of a motor. It is explanatory drawing which shows the flow of the cooling air seen from the radial inside of the stator piece. It is explanatory drawing which shows the flow of the cooling air seen from the radial inside of the stator piece. It is explanatory drawing which shows the flow of the cooling air seen from the radial direction outer side of the stator piece. It is explanatory drawing which shows the flow of the cooling air seen from the radial direction outer side of the stator piece. It is explanatory drawing which shows the mode of the heat conduction of the winding in the past, and the flow of the cooling air seen from the radial inside of the stator piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Stator piece 3A Magnetic pole teeth 3B Yoke part 5 Stator winding 6 Insulating bobbin 9 Teeth side extension part 10 Yoke side extension part 13 Rotor 14 Fin 15 Cooling groove 16 Opening part 17 Suction port 18 Exhaust port

Claims (3)

In a motor provided with a rotor provided with fins and a stator arranged opposite to the rotor,
A plurality of cooling passages communicating from the radially inner periphery side to the outer periphery side are formed in an insulating bobbin that is interposed between the stator core and the stator winding wound around the stator core to insulate them. Motor. The insulating bobbin includes an inner extending portion that extends in the axial direction and the circumferential direction of the stator on the inner peripheral side of the stator, and an outer peripheral side extending portion that extends in the axial and circumferential directions of the stator on the outer peripheral side of the stator. ,
2. The suction port of the cooling passage is formed in the inner peripheral side extension portion, and the discharge port of the cooling passage is formed in the outer peripheral side extension portion. Motor. The motor according to claim 2, wherein the insulating bobbin has an opening formed in the cooling passage on an axial side surface thereof.

Images