JP2011087426A - Rotary electric machine and rotor used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor efficiently cooling heating at front end parts of magnetic pole teeth of a laminated core. <P>SOLUTION: The rotor 1 is equipped with: a laminated core 4 in which a plurality of core members 6 are stacked containing magnetic pole teeth 7 arranged radially with a rotational axis as a center; and a coil 5 wound on the magnetic pole teeth of the laminated core. In order to form a through hole 9 at the front end part 8 protruding from the coil, of magnetic pole teeth of the laminated core, a recess 12, a cut 13, or a hole 54 is formed in advance at the core member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electric machine such as a motor and a generator, and a rotor used therefor.

  Generally, in a rotating electrical machine, a laminated core formed by laminating thin plate-like core members made of a magnetic material is used to reduce iron loss. Here, the laminated iron core for the rotor has magnetic pole teeth portions arranged radially from the rotation axis, and the laminated iron core for the stator has a tip of the magnetic pole teeth portion of the rotor through an air gap. It arrange | positions so that it may oppose and surround this part.

  In addition, since the laminated core for the stator and the laminated core for the rotor have an uneven shape at the facing portions, the harmonic magnetic field other than the fundamental wave corresponding to the number of magnetic poles of the rotor with respect to the varying magnetic field between the rotor and the stator. Has a wave component. This harmonic component fluctuates at a high frequency of about several hundreds to several thousand Hz and induces eddy current loss, particularly in the vicinity of the air gap between the stator and the rotor, that is, at the tip of the magnetic pole teeth.

  In a rotor used in a conventional rotating electrical machine, only these grooves are provided by providing a spiral groove for applying a thrust that causes the air in the gap to flow in one axial direction as the rotor rotates. Alternatively, by using a cooling fan (fan) in combination, the flow rate of the air flowing through the air gap is increased, and the cooling efficiency at the tip of the magnetic pole tooth portion is improved. (For example, patent document 1).

JP-A-8-275421 (page 3, FIG. 1)

  In the rotor as described above, it is necessary to cut the outer peripheral surface of the laminated core in order to provide a spiral groove after the core members are laminated to form the laminated core. Since continuity occurs on the cut surface of the core member laminated by this cutting process, the eddy current loss further increases, resulting in a decrease in motor efficiency, and at the same time, the rotor core cannot be cooled sufficiently. was there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a rotor that can efficiently cool the heat generated at the tip of the magnetic pole tooth portion of the laminated iron core.

A rotor according to the present invention includes a laminated iron core formed by laminating a plurality of core members each having a magnetic tooth portion radially arranged around a rotation axis, and a coil wound around the magnetic pole tooth portion of the laminated iron core And.
Further, the core member is preliminarily formed with a recess, a notch or a hole so that a through hole is formed at the tip of the magnetic pole tooth portion of the laminated iron core protruding from the coil.

According to the stator according to the present invention, since the through hole is formed in the tip portion of the magnetic pole tooth portion, the area in contact with the surrounding air is increased particularly at the tip portion of the magnetic pole tooth portion that generates a large amount of heat due to eddy current loss. The cooling of this part can be strengthened.
Further, since the core member is previously formed with a recess, a cut portion or a hole so that the through hole is formed, there is no need to perform post-lamination cutting as in the prior art, and the core member by cutting Since no conduction occurs between them, the eddy current loss does not increase.

It is a figure which shows the external shape and cross section of the rotor by Embodiment 1 of this invention. It is AA sectional drawing of FIG. 1 about the rotor by Embodiment 1 of this invention. It is the elements on larger scale of a magnetic pole teeth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 1 of this invention. It is a figure which shows the shape of a wedge about the rotor by Embodiment 1 of this invention. It is a figure which shows the internal structure of the rotary electric machine by Embodiment 2 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 2 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 2 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 2 of this invention. It is a figure which shows the cross section of the through-hole provided in the front-end | tip part of the magnetic pole tooth part about the rotor by Embodiment 2 of this invention.

Embodiment 1 FIG.
1 to 4 are drawings showing a structure related to a rotor 1 of a rotating electrical machine according to Embodiment 1 of the present invention. In FIG. 1, the left half of the rotation shaft shows an outline view, and the right half shows a cross section along the rotation shaft. The rotor is rotatably held at both ends of the rotating shaft 2 by bearings 3a and 3b, and a laminated core 4 and a coil 5 are disposed at substantially the center of both bearings 3a and 3b.

  2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a partially enlarged view of the magnetic pole teeth portion. The laminated core 4 is formed by laminating a plurality of core members 6 in the direction of the rotating shaft 2. The coil 5 is formed by winding around the magnetic pole tooth portion 7 of the laminated core 4, and the coil 5 is not wound around the tip portion 8 of the magnetic pole tooth portion 7 and protrudes from the coil 5.

  As shown in FIG. 3, a through hole 9 is formed at the tip 8 of the magnetic tooth portion 7, and FIG. 4 shows an example of a BB cross section from one end 10 to the other end 11 of the through hole 9. The through-hole 9 is formed over the four core members 6a to 6d. Of these, in the figure, the second 6b from the top has a recess 12b with a reduced thickness and the core member is completely missing. A cut portion 13b is formed. Similarly, a concave portion 12c and a cut portion 13c are also formed in the third core member 6c from the top. The through holes 9 that communicate with each other are formed by appropriately arranging the recesses 12b and 12c and the notches 13b and 13c.

  The recesses 12b and 12c can be formed in advance by cutting or etching (half etching) or the like in a single product state before the core member 6 is laminated. Further, the cut portions 13b and 13c can be formed by punching by punching in addition to cutting and etching. Here, when formed by cutting or punching, it may cause deterioration of magnetic properties due to processing strain, but according to etching, iron loss does not increase with such deterioration of magnetic properties, In particular, a highly efficient motor device can be obtained.

  Alternatively, FIG. 5 shows a cross-sectional view of another form of the through-hole 9a, taken along the line B-B. Thus, by providing only one recess 12c in one core member 6c, the communicating through-hole 9a is formed. be able to. The recess 12c can also be formed in advance by cutting or etching (half etching) in a single product state before the core member 6 is laminated.

  Further, in the present embodiment, as shown in FIG. 3, one end 10 of the through hole is provided on the front side 14 in the rotational direction at the tip 8 of the magnetic teeth portion 7, and the other end 11 is opposite to the one end 10. It is provided in the rotational direction. Here, the front side 14 in the rotation direction is a portion indicated by a broken line in FIG. 3 and refers to a surface on which air existing around the magnetic pole teeth portion 7 is blown as the rotor 1 rotates.

  Examples of those satisfying the condition of the through hole 9 are shown in FIGS. As shown in FIG. 6, one end 10 b of the through hole may be arranged inside the coil 5. Since there is a gap between the wires constituting the coil 5, it is possible to cool the inside of the coil 5 by passing a part of the air flow led to the through hole 9 b through the coil 5. Further, the through hole 9c is appropriately curved as shown in FIG. 7 so that the air in the through hole 9 easily flows, or the cross section of the through hole 9d is increased from one end 10d to the other end 11d as shown in FIG. You may enlarge it. Further, as shown in FIG. 9, the through hole 9e may be formed so as to be in the substantially same direction as the rotation direction. On the other hand, when the rotation direction is not fixed in one direction but rotates in both directions, the through holes 9f may be arranged so as to face in the radial direction as shown in FIG.

  When the rotor 1 is rotated at a high speed, a wedge 15 may be provided as shown in FIG. 10 to resist the centrifugal force acting on the coil 5. Even in such a case, a hole or a notch is formed in the wedge 15. By providing 16, it is possible to guide the air flow to the through hole 9.

As described above, according to the rotor according to the present embodiment, since the through hole 9 is formed at the tip 8 of the magnetic teeth 7, particularly at the tip 8 of the magnetic teeth 7 that generate a large amount of heat due to eddy current loss. The area in contact with the surrounding air can be increased and the cooling of this part can be enhanced.
Further, since the recess 12 or the cut portion 13 is formed in advance in the core member 6 so that the through hole 9 is formed, it is not necessary to perform post-lamination cutting as in the prior art, and the core by cutting Since conduction between the members 6 does not occur, eddy current loss does not increase.

  Further, in the present embodiment, one end 10 of the through hole is provided on the front side 14 in the rotational direction at the tip 8 of the magnetic teeth portion 7, and the other end 11 is provided in the counter-rotating direction with respect to the one end 10. Therefore, the air flow can be smoothly introduced into the through hole 9 from the one end 10 to the other end 11. This makes it possible to further improve the cooling efficiency.

Embodiment 2. FIG.
FIG. 12 is a diagram showing a structure related to the rotating electrical machine 50 according to the present embodiment. The rotating electrical machine 50 includes a rotor 51, a stator 52, and a self-excited or separately-excited fan 53. The configuration of the rotor 51 is basically the same as that of the rotor 1 shown in FIG. Further, an air flow is generated in the direction of the rotation axis of the rotor 51 by the fan 53, and the rough direction of the air flow is indicated by an arrow in the figure.

  Also in the present embodiment, there is a feature in the shape of the through hole 9 formed in the distal end portion 8 of the magnetic pole tooth portion 7 of the rotor 51. That is, taking the through hole 9 shown in FIG. 4 as an example, when the fan 53 is arranged in the upper side in FIG. 4 and an air flow is generated from the upper side to the lower side, one end 10 of the through hole 9 is It is provided on the upstream side of the air flow generated by the fan 53, and the other end 11 is provided on the downstream side of the air flow from the one end.

  As the through hole 9 having such a shape, in addition to FIG. 4, for example, two core members 6b, 6c formed with recesses 12b, 12c as shown in FIG. 13, two core members as shown in FIG. This can also be realized by forming the cut portions 13b and 13c in 6b and 6c, or by forming the cut portions 13b and 13d and the hole portion 54c in the three core members 6b, 6c and 6d as shown in FIG.

  Here, comparing what is shown in each of FIGS. 13, 14, and 15, the angle formed between the direction in which the airflow flows in the through hole 9 and the rotation axis decreases from FIG. 13 to FIG. 15. The direction of the airflow passing through the direction of FIG. 15 approaches the direction of the airflow outside the through hole. For this reason, it is possible to reduce the turbulence of the airflow at the merging portion when merging with the airflow flowing outside the through hole 9 and to further reduce the windage loss. Also, comparing FIG. 4 and FIG. 14, since the corners are dropped by the recesses 12 b and 12 c in FIG. 4, the opening cross-sectional area of this portion is large, and the airflow can be made smoother than in FIG. 14.

  As described above, according to the rotating electrical machine 50 according to the present embodiment, the fan 53 that generates the airflow in the rotation axis direction is provided, and the laminated core 4 of the rotor 51 is formed in the through hole 9 of the tip portion 8 of the magnetic pole tooth portion 7. Since the one end 10 is provided on the upstream side of the air flow and the other end 11 is provided on the downstream side of the air flow from the one end 10, the air flow that has passed through the through hole 9 has a velocity component in the rotation axis direction. Therefore, when the airflow flowing through the outside of the through hole 9 is merged, the windage loss is small, so that the overall efficiency of the rotating electrical machine 50 including the power required for the rotational drive of the fan 53 can be increased.

  Further, as shown in FIG. 16, by arranging one end 10 of the through hole 9 in the vicinity of the coil end 55 disposed on the upstream side of the airflow among the coil ends of the coil 5, the coil end 55 functions as a guide for the airflow. Then, since the airflow colliding with this can be easily introduced into the through hole 9 along the coil end 55, the airflow passing through the through hole 9 can be increased to cool the tip portion 8 of the magnetic teeth portion 7 more efficiently. it can.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotating shaft 4 Laminated iron core 5 Coil 6, 6a-6e Core member 7 Magnetic pole teeth part 8 Tip part 9, 9a-9i Through hole 10, 10a-10i One end 11, 11a-11i The other end 12b, 12c Recessed part 13b , 13c Cut section 14 Front side in the rotation direction 50 Rotating electrical machine 51 Rotor 52 Stator 53 Fan 54c Hole 55 Coil end

Claims (6)

A laminated core formed by laminating a plurality of core members having magnetic pole teeth arranged radially around the rotation axis;
In a rotor including a coil wound around the magnetic pole teeth portion of the laminated core,
A rotation characterized in that a recess, a cutout or a hole is formed in the core member in advance so that a through hole is formed in the tip of the magnetic pole tooth portion of the laminated core protruding from the coil. Child. The rotor according to claim 1, wherein the core member has a recess, a cut portion, or a hole formed by etching. 2. The rotor according to claim 1, wherein one end of the through hole is provided on the front side in the rotation direction at the tip of the magnetic pole tooth portion, and the other end is provided in the counter-rotation direction with respect to the one end. A rotor according to claims 1 to 3,
A rotating electrical machine comprising: a stator having a laminated core disposed so as to oppose a tip portion of a magnetic pole tooth portion of the laminated core of the rotor via an air gap and surround the rotor. It has a fan that generates airflow in the direction of the rotation axis,
In the laminated iron core of the rotor, one end of the through hole at the tip of the magnetic pole tooth portion is provided on the upstream side of the air flow, and the other end is provided on the downstream side of the air flow from the one end. The rotating electrical machine according to claim 4. 6. The rotating electrical machine according to claim 5, wherein the laminated iron core of the rotor is formed with one end of a through hole at the tip of the magnetic pole tooth portion in the vicinity of the coil end disposed upstream of the air flow generated by the fan. .

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