JP2005094959A - Permanent magnet rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a permanent magnet rotary electric machine that eliminates troubles that caulking connection provided on dense magnetic flux portions causes the interruption of flux flow and the increase of iron loss, and that is good in productivity. <P>SOLUTION: Fixing means of magnetic steel sheets that constitutes an iron core of the permanent magnet rotary electric machine of this invention are configured to be at the inside circumference side in the radial direction in between a plurality of magnets constituting the magnetic poles of a rotor core in the rotor core, and to incline to the tangential line on the rotor surface facing teeth portions 15 in a stator core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine formed by laminating electromagnetic steel plates.

  As a conventional technique, a case of a two-pole three-slot structure will be described. Conventionally, the caulking connection for fixing the rotor core is installed on the d-axis which is the central axis of the magnet magnetic flux and the q-axis line which is magnetically orthogonal thereto. Further, the caulking connection for fixing the laminated iron plates of the stator core is provided so as to be the longitudinal direction of the caulking connection in the orthogonal direction with respect to the tangent of the rotor surface facing the teeth portion constituting the stator core. For example, JP-A-11-206051 (hereinafter referred to as Patent Document 1) and JP-A 2000-69693 (hereinafter referred to as Patent Document 2).

JP-A-11-206051 JP 2000-69693 A

  Caulking connection is generally used because it is simple as a fixing means between steel plates and has a large fixing force, but due to plastic working on the steel plates, it tends to cause adverse effects such as obstruction of the magnetic path and increase in iron loss. .

  Conventionally, the caulking connection for fixing the rotor core is installed on the d-axis that is the central axis of the magnet magnetic pole and the q-axis line that is magnetically orthogonal to this as described above. The magnetic flux density at the caulking connection position installed on the d-axis and q-axis is high, and particularly when the magnetic flux penetrates the rotor as in the case of a two-pole rotor, the flow of the magnetic flux is greatly inhibited, and the induced electromotive force is reduced. There was an adverse effect such as. On the other hand, the caulking connection for fixing the laminated iron plates of the stator core is set to be the longitudinal direction of the caulking connection in a direction orthogonal to the tangent line of the rotor surface facing the teeth portion constituting the stator core as described above. However, since the flow of magnetic flux lines is an oblique direction of the orthogonal line between the teeth and the rotor surface tangent, and the caulking connection crosses the flow of magnetic flux, motor characteristics such as magnetic path obstruction and iron loss increase are considered. The negative effect was great.

  As described above, the conventional motor has a great influence on the motor characteristics. Since the caulking connection is provided on the d axis and the q axis, there is a possibility that the flow of magnetic flux is interrupted and the iron loss increases.

  An object of the present invention is to prevent deterioration of characteristics of a rotating electrical machine due to caulking connection.

  According to one aspect of the present invention, the caulking connection position is provided in a place where the magnetic flux density is low and the magnetic flux change is small. Thereby, the deterioration of the motor characteristics can be prevented and the productivity of the motor can be improved.

  The other features of the present invention will be described in the following “Best Mode for Carrying Out the Invention”.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain the rotor core and stator core of the permanent magnet type rotary electric machine which prevented the fall of the motor characteristic by the caulking connection of a laminated iron plate, and was excellent in productivity.

  Hereinafter, examples of embodiments of the present invention will be described.

Embodiments of a rotating electrical machine according to the present invention will be described below using an example of a 2-pole 3-slot structure with reference to the drawings. In this embodiment, the caulking connection 30 is used as a fixing means for the electromagnetic steel plate of the stator core 11.

  FIG. 1 is an explanatory view of a caulking connection position of a rotating electrical machine according to the present invention, and FIG. 2 is a detailed explanatory view of a caulking connection position of a rotor of the rotating electrical machine according to the present invention.

The rotor 1 has a structure in which an N-pole side permanent magnet 6 and an S-pole side permanent magnet 7 are embedded in a slot 3 provided in the rotor core 2, and a shaft 20 for transmitting rotational torque is provided at the center thereof. The permanent magnet is divided into three parts. On the other hand, the stator 10 includes a stator core 11 and a winding 5 that is directly wound around a tooth portion 15 of the stator core 11, and is a concentrated winding system.

  The rotor iron core 2 and the stator iron core 11 were both laminated with electromagnetic steel plates, and the electromagnetic steel plates were fixed to each other by caulking connection. There are 4 caulking connections on the rotor side (2 locations per magnetic pole, 2 magnetic poles) and 12 locations on the stator side (4 locations per phase, 3 phases), and the iron core must be secured sufficiently. is there.

  FIG. 5 is an example of the magnetic field analysis result of the motor, and the density of the magnetic flux density is mapped using contour lines. In the figure, the denser the contour lines, the higher the magnetic flux density and the larger the rate of change of the magnetic flux.

  The caulking connection position is set on the radially inner peripheral side between the magnets divided into three per magnetic pole of the rotor 1. This is because the magnetic flux density at this point is sparse from the result of the magnetic field analysis of the motor shown in FIG. 5, and if the caulking connection is made at this position, the adverse effect on the motor characteristics can be reduced. is there. On the other hand, the caulking connection 30 is inclined with respect to the tangent of the rotor surface facing the teeth portion 15 constituting the stator core 11 so as not to hinder the flow of magnetic flux.

  The caulking connection position will be described in detail using the cross-sectional structure of the rotor of the permanent magnet type rotating electric machine according to the present embodiment shown in FIG. Motor torque is broadly divided into magnet torque acting on the d-axis and reluctance torque acting on the q-axis, but the caulking connection part that inhibits the flow of magnetic flux is a position avoiding the d-axis and q-axis where the magnetic flux is concentrated. Is provided. Further, the number of caulking connections is required to be four or more from the viewpoint of securing the strength of the rotor core 2. In this embodiment, the permanent magnets constituting the magnetic poles are divided into three parts, so that the magnetic flux density is sparse. However, there are four locations on the radially inner peripheral side between the magnets. A caulking connection was provided using this part. According to the present embodiment, the caulking connection does not hinder the flow of magnetic flux, and the magnetic flux smoothly passes through the rotor core 11, so that iron loss of the motor can be prevented and the efficiency and output of the motor are improved. Can do.

  FIG. 3 shows another embodiment according to the present invention. This is a case where the permanent magnets 6 and 7 used in the rotor 1 are made smaller than the permanent magnets 6 and 7 of the embodiment shown in FIG. 2 and the permanent magnets 6 and 7 are further concentrated on the magnetic pole center side. As a result, it is possible to reduce the amount of magnets used and to provide a motor at a low cost. Also in this case, the caulking connection position is set to the radially inner peripheral side between the magnets constituting the magnetic pole, thereby suppressing adverse effects on the motor characteristics.

  In this embodiment, the caulking connection position is not the outer peripheral side in the radial direction between the magnets of the rotor but the inner peripheral side. This is because the fastening force between the cores is not sufficient.

  FIG. 4 shows another embodiment according to the present invention. This is a case where the stator core 11 is divided into a core back portion 16 and a teeth portion 15. By making the tooth portion 15 separable from the core back portion 16, the stator 10 can be assembled after the winding 5 is wound around the tooth portion 15, so that the space factor of the winding 5 is increased. Therefore, there is an advantage that copper loss can be reduced and efficiency can be improved. The tooth portion 15 is provided with at least two caulking connections 30, and the long side of the caulking connection 30 is tangent to the rotor surface facing the teeth portion 15 constituting the stator core 11 so as not to hinder the flow of magnetic flux. In contrast, it is inclined.

  In the above, the content regarding the caulking connection position which suppresses the bad influence on a motor characteristic at the time of using caulking connection as a fixing means of the rotor core and stator core of the permanent magnet type rotary electric machine which concerns on this invention was described. For the rotor, the inner peripheral side in the radial direction between the plurality of permanent magnets constituting the same magnetic pole, and for the stator, facing the teeth portion constituting the stator core so as not to hinder the flow of magnetic flux. By inclining with respect to the tangent to the rotor surface, it is possible to suppress the deterioration of the motor characteristics and to obtain a permanent magnet type rotating electrical machine with good productivity.

It is sectional drawing which shows the structure of one Example in the rotor and stator of the permanent magnet type rotary electric machine which concerns on this invention. It is detailed explanatory drawing of the cross-sectional structure of the rotor of the permanent magnet type rotary electric machine which concerns on this invention. It is detailed explanatory drawing of the cross-sectional structure of the rotor of the permanent magnet type rotary electric machine in the other Example which concerns on this invention. It is detail sectional drawing of the stator of the permanent magnet rotary electric machine in the other Example which concerns on this invention. It is an example of the magnetic field analysis result of a motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Rotor core, 3 ... Slot, 5 ... Winding, 6 ... N pole side permanent magnet, 7 ... S pole side permanent magnet, 10 ... Stator, 11 ... Stator core, 15 ... Teeth , 16 ... core back part, 20 ... shaft, 30 ... caulking connection, 40 ... stator core split part.

Claims (8)

  A stator provided with a plurality of windings, a rotor core supported on a rotary shaft so as to be rotatable inside the stator, and a plurality of magnets housed in slots provided in the rotor core; In the permanent magnet type rotating electrical machine having a rotor with a rotor, the fixing means for the electromagnetic steel plates constituting the rotor core is a position on the radially inner peripheral side between a plurality of magnets constituting the same magnetic pole of the rotor. A rotating electric machine characterized by   2. The rotating electrical machine according to claim 1, wherein the position of the fixing means is not located on the central axis of the magnet magnetic pole.   A stator provided with a plurality of windings, a rotor core supported on a rotary shaft so as to be rotatable inside the stator, and a plurality of magnets housed in slots provided in the rotor core; In the permanent magnet type rotating electrical machine having the rotor with the stator, the fixing means of the electromagnetic steel plates constituting the stator core is inclined with respect to the tangent of the rotor surface facing the teeth portion constituting the stator core. Rotating electric machine characterized by that.   2. The rotating electrical machine according to claim 1, wherein a plurality of magnets constituting the same magnetic pole of the rotor are concentratedly arranged on the magnetic pole center side.   4. The stator iron core according to claim 3, wherein the stator iron core can be divided into a tooth portion and a core back portion, and a magnetic pole having a winding wound around the teeth portion is fastened and fixed to the core back portion. Rotating electric machine.   2. The rotating electrical machine according to claim 1, wherein the rotor is a rotor having two poles.   The rotating electrical machine according to claim 1, wherein the winding wound around the tooth portion is a concentrated winding method. The rotating electrical machine according to claim 1, wherein the fixing means between the electromagnetic steel plates is caulking connection.

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