JP6319416B1 - Permanent magnet rotating electric machine - Google Patents

Abstract

The present invention provides a permanent magnet type rotating electrical machine that can reduce eddy current loss and improve the centrifugal force resistance of a rotor to cope with high-speed rotation and high fluctuation torque. SOLUTION: One set includes a plurality of permanent magnets affixed in an annular shape, and a plurality of sets are arranged along the axial direction of a rotor 10, and a shaft is provided on the outer periphery of the plurality of sets of magnet portions 14. In a permanent magnet type rotating electrical machine having a plurality of anti-scattering rings 16 press-fitted along a direction, the anti-scattering ring 16 is provided with an insulating coating 16b provided on both side surfaces in contact with the other anti-scattering rings 16 adjacent to each other. And a chamfered surface 16c provided between the outer peripheral surface and one side surface, and an insulating coating 16d provided on the chamfered surface 16c. [Selection] Figure 2

Description

  The present invention relates to a permanent magnet type rotating electrical machine, and more particularly to a structure of a rotor of a surface sticking type permanent magnet type rotating electrical machine.

  Patent Document 1 discloses a permanent magnet type rotating electrical machine that suppresses a temperature increase of a permanent magnet caused by the generation of fluctuating torque. Referring to FIG. 1 of Patent Document 1, since eddy current loss occurs in the permanent magnet 5 during high-speed rotation or when fluctuating torque occurs, the eddy current path is blocked by the insulating member 8b, and the spacer 8 The magnetic field fluctuation at the position and the eddy current loss caused thereby are reduced, and the temperature rise of the spacer 8 itself is reduced. Therefore, the temperature rise of the permanent magnet 5 is reduced.

  Patent Document 2 discloses a so-called SPM motor (Surface Permanent Magnet Motor), which is a surface-attached permanent magnet rotating electric machine that suppresses an increase in eddy current loss of a retaining ring and permanent magnet. Referring to FIG. 2 of Patent Document 2, in order to suppress an increase in eddy current loss, a first gap (S111) that divides the eddy current path in the permanent magnet (101), and a retaining ring (102). And a second gap (S112) for dividing the eddy current path.

JP 2001-231201 A JP 2014-064428 A

  In the structure of the rotor shown in FIG. 1 of Patent Document 1, since there is no insulating material (insulating coating) on the outer surfaces of the permanent magnet 5 and the spacer 8, even if the side surface insulation between the spacers 8 is maintained, In the vicinity of the surface between the adjacent spacers, eddy currents may be conducted due to adhesion of minute iron powder or conductive material attracted to the permanent magnet 5 or generation of indentations on the surface of the spacer 8. There is a risk of inhibiting the current loss reduction effect. Further, as described in paragraph 0019 of Patent Document 1, the spacers 8 are only bolted and fixed to holding rings (not shown) provided at both ends in the axial direction, and high-speed rotation and variable torque are generated. In this case, the permanent magnet 5 may be scattered in the radial direction due to centrifugal force, and there is a possibility that the permanent magnet 5 cannot be operated with high speed rotation and high fluctuation torque.

  Further, in the structure of the rotor shown in FIG. 2 of Patent Document 2, a jig such as a spacer for creating a gap is required at the time of manufacture, which causes a problem that jig cost increases. Moreover, when there is a fluid in the motor, there is a possibility that loss increases due to an increase in pipe resistance due to unevenness in the rotor. Moreover, if it demonstrates with reference to FIG. 3 of patent document 2, since the axial direction length L1 of a magnet becomes short by the part which has the space | gap D1 in an axial direction, magnet torque will reduce. In particular, in a surface-attached permanent magnet type rotating electrical machine that uses only magnet torque, performance degradation is unavoidable.

  In addition, as described in paragraph 0035 of Patent Document 2, since the retaining ring (102) is shrink-fitted on the outer periphery of the permanent magnet (101), it is troublesome to heat the retaining ring (102) in the manufacturing process. Temperature control is difficult. For example, when a titanium alloy or the like is used as the retaining ring (102), since its thermal expansion coefficient is low, it takes time to raise the temperature, and it is also necessary to increase the temperature, making temperature management difficult. In addition, material deterioration due to high temperatures may be a problem.

  The present invention has been made in view of the above problems, and provides a permanent magnet type rotating electrical machine that can reduce high-speed rotation and high fluctuation torque by reducing eddy current loss and improving the centrifugal resistance of the rotor. The purpose is to do.

The permanent magnet type rotating electrical machine according to the first invention for solving the above-mentioned problems is as follows.
A plurality of permanent magnets in which one set is annularly attached, and a plurality of sets are arranged along the axial direction of the rotor;
A plurality of annular members press-fitted along the axial direction on the outer periphery of a plurality of sets of the magnet portions;
The annular member includes a first side surface insulating portion provided on one or both side surfaces in contact with the other adjacent annular member, a chamfered surface provided between an outer peripheral surface and one of the side surfaces, And a chamfered surface insulating portion provided on the chamfered surface.

The permanent magnet type rotating electrical machine according to the second invention for solving the above-mentioned problems is
In the permanent magnet type rotating electrical machine according to the first invention,
The chamfered surface is a flat surface or a curved surface.

A permanent magnet type rotating electrical machine according to a third invention for solving the above-mentioned problems is as follows.
In the permanent magnet type rotating electric machine according to the first or second invention,
The chamfered surface is provided on the press-fitting direction side.

In the permanent magnet type rotating electrical machine according to the first to third aspects of the invention,
The annular member has a first chamfered surface provided between an inner peripheral surface and one or both of the side surfaces,
The magnet part includes a second side insulating part provided on one or both side surfaces in contact with the other adjacent magnet part, and a second side provided between an outer peripheral surface and one or both side surfaces. Chamfered surface,
The space formed by one or both of the first chamfered surfaces in the adjacent annular members communicates with the space formed by one or both of the second chamfered surfaces in the adjacent magnet portions, You may make it arrange | position the said magnet part and the said annular member.

Furthermore, the first chamfered surface and the second chamfered surface may be flat or curved.

  Furthermore, the annular member may have an inner peripheral surface insulating portion provided on the inner peripheral surface.

  Furthermore, the magnet part may have an outer peripheral surface insulating part provided on the outer peripheral surface.

  Furthermore, you may have at least one among the 1st chamfering surface insulation part provided in the said 1st chamfering surface, and the 2nd chamfering surface insulation part provided in the said 2nd chamfering surface. .

  ADVANTAGE OF THE INVENTION According to this invention, in a permanent magnet type rotary electric machine, while being able to aim at reduction of an eddy current loss, the centrifugal force resistance of a rotor can be improved and it can respond to a high speed rotation and a highly variable torque.

It is a perspective view explaining the rotor of the permanent magnet type rotary electric machine which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS As an example (Example 1) of the embodiment of the permanent magnet type rotary electric machine which concerns on this invention, it is a figure explaining the structure of a rotor, (a) is sectional drawing of a rotor, (b) is a magnet of a rotor. (C) is sectional drawing of the scattering prevention ring of a rotor. As a modification of the permanent magnet type rotating electric machine shown in FIG. 2, it is a figure explaining the structure of a rotor, (a) is sectional drawing of a rotor, (b) is sectional drawing of the magnet part of a rotor, c) is a cross-sectional view of a rotor scattering prevention ring. As another example (Example 2) of the embodiment of the permanent magnet type rotating electrical machine according to the present invention, it is a diagram for explaining the structure of the rotor, (a) is a sectional view of the rotor, (b) is the rotor (C) is sectional drawing of the scattering prevention ring of a rotor. As a modification of the permanent magnet type rotating electric machine shown in FIG. 4, it is a figure explaining the structure of a rotor, (a) is sectional drawing of a rotor, (b) is sectional drawing of the magnet part of a rotor, c) is a cross-sectional view of a rotor scattering prevention ring. It is sectional drawing explaining the problem in the rotor of the conventional permanent magnet type rotary electric machine.

  Embodiments of a permanent magnet type rotating electrical machine according to the present invention will be described below with reference to FIGS. In addition, since this invention is related with the structure of the rotor of a permanent magnet type rotary electric machine, in FIGS. 1-5, the rotor is mainly illustrated.

[Example 1]
The permanent magnet type rotating electrical machine of the present embodiment will be described with reference to FIGS. The permanent magnet type rotating electrical machine of this embodiment has a rotor 10 and a cylindrical stator 20 through which the rotor 10 is inserted on the inner peripheral side, and these are provided in a casing (not shown). Contained.

  The rotor 10 includes a rotating shaft 11 that is rotatably supported by the casing, an electromagnetic steel plate 13 that is stacked on the outer periphery of the rotating shaft 11, and an outer periphery of the electromagnetic steel plate 13 along the axial direction of the rotor 10. And a plurality of anti-scattering rings 16 (annular members) press-fitted along the axial direction of the rotor 10 to the outer periphery of the plurality of sets of magnet portions 14. ing. The set of magnet portions 14 is composed of a plurality of permanent magnets, and these are affixed to the outer periphery of the electromagnetic steel sheet 13 in an annular shape. That is, the permanent magnet type rotating electrical machine of the present embodiment is a so-called SPM motor, which is a surface-attached permanent magnet type rotating electrical machine.

  In addition, fixing rings 12 that fix the plurality of magnet portions 14 are provided at both ends of the rotating shaft 11. In addition, a gap 17 is formed between the rotor 10 and the stator 20, and a cooling insulating fluid (air for air cooling, cooling oil for oil cooling, etc.) flows.

  2 and 3, N is an integer equal to or greater than 2, the N−1th magnet portion 14 is represented as “14 (N−1)”, and the Nth magnet portion 14 is represented as “14 (N N) ”, and the (N + 1) th magnet portion 14 is represented as“ 14 (N + 1) ”. Similarly, the (N−1) -th anti-scattering ring 16 is represented as “16 (N−1)”, the N-th anti-scattering ring 16 is represented as “16 (N)”, and the (N + 1) -th anti-scattering ring 16 is represented by “ 16 (N + 1) ".

  In this embodiment, the configuration of the magnet portion 14 and the scattering prevention ring 16 is devised in order to reduce eddy current loss.

  Specifically, in the magnet portion 14, between the outer peripheral surface (the surface on the scattering prevention ring 16 side) and one or both of the side surfaces, chamfer the corners or corners that originally existed in the part, A flat chamfered surface 14a (second chamfered surface) is provided. Moreover, the insulating coating 14b (2nd side surface insulation part) is provided in the one or both side surface which touches the adjacent other magnet part 14. FIG.

  In FIG. 2, the magnet portion 14 includes a chamfered surface 14 a provided between the outer peripheral surface and both side surfaces, and an insulating coating 14 b provided on both side surfaces in contact with the adjacent other magnet portion 14. The configuration is shown. In FIG. 3, the magnet portion 14 has a chamfered surface 14 a provided between the outer peripheral surface and one side surface, and an insulating coating 14 b provided on one side surface in contact with the other adjacent magnet portion 14. The configuration is shown.

  Also, in the scattering prevention ring 16, chamfering of the corner or corner that originally existed in the portion is performed between the inner peripheral surface (the surface on the magnet portion 14 side) and one or both of the side surfaces. A chamfered surface 16a (first chamfered surface) is provided. Moreover, the insulating coating 16b (1st side surface insulation part) is provided in the one or both side surface which contact | connects the other adjacent scattering prevention ring 16. FIG. Further, between the outer peripheral surface (the surface on the stator 20 side) and one side surface (the left side surface in the figure), the corner or corner portion that originally existed in the portion is chamfered to obtain a flat chamfered surface. 16c is provided, and this chamfered surface 16c is also provided with an insulating coating 16d (a chamfered surface insulating portion).

  In FIG. 2, the anti-scattering ring 16 includes a chamfered surface 16 a provided between the inner peripheral surface and both side surfaces, and an insulating coating 16 b provided on both side surfaces in contact with the other adjacent anti-scattering ring 16. The structure which has is shown. In FIG. 3, the anti-scattering ring 16 includes a chamfered surface 16 a provided between the inner peripheral surface and one side surface, and an insulating coating 16 b provided on one side surface in contact with the other adjacent anti-scattering ring 16. The structure which has is shown.

  As described above, in this embodiment, it is only necessary to form an insulating coating on a part of the surfaces of the magnet portion 14 and the scattering prevention ring 16, and it is not necessary to form an insulating coating on all surfaces, and the insulating coating is formed. Cost can be reduced.

  Further, as the above-described insulating coatings 14b, 16b, and 16d, for example, a ceramic film, a resin film, a DLC (Diamond-Like carbon) film, or the like can be applied. Ceramic-based films include oxide ceramics such as aluminum oxide (alumina), nitride ceramics such as titanium nitride (TiN) and chromium nitride (CrN), plasma field oxidation (PEO), and resin-based. Examples of the film include a polyimide resin and an epoxy resin. In particular, the DLC film has excellent electrical properties and sliding properties, as well as low friction, low wear, mechanical properties that are as hard as diamond and corrosion resistance, and is suitable as the insulating coatings 14b, 16b, and 16d. Material.

  When the rotor 10 is manufactured using the magnet part 14 and the scattering prevention ring 16 having the above-described configuration, one or both chamfered surfaces 14a form a space 15a in the adjacent magnet parts 14, and this The space 15a is arranged on the scattering prevention ring 16 side at the boundary between the adjacent magnet portions 14. In addition, between adjacent scattering prevention rings 16, one or both of the chamfered surfaces 16 a form a space 15 b, and this space 15 b is disposed on the magnet part 14 side at the boundary between the adjacent scattering prevention rings 16. become.

  And the space 15 is formed by arrange | positioning the magnet part 14 and the scattering prevention ring 16 so that the space 15a and the space 15b may connect. The space 15 thus formed functions as an electrical insulating layer by an insulating fluid (such as air or cooling oil) existing inside the space.

  Here, both the spaces 15a and 15b have a triangular cross section, but may have any cross sectional shape as long as a space functioning as an insulating layer can be secured. For example, a trapezoidal or polygonal cross section may be used.

  When there is no such space 15, even if the insulation between the adjacent magnet portions 14 and between the adjacent anti-scattering rings 16 is insulated with an insulating coating or insulating material, the eddy current path May be formed.

  For example, as shown in FIG. 6, in the rotor 40, the adjacent magnet portions 43 are insulated from each other by an insulating material 44 (or insulating coating), and the adjacent anti-scattering rings 45 are insulated from each other. (Or insulating coating). In such a structure, when there is a dimensional error of the magnet part 43 or the scattering prevention ring 45 or a positional deviation of the magnet part 43 or the scattering prevention ring 45 due to assembly, there is a gap between the adjacent magnet part 43 and the scattering prevention ring 45. The path of eddy current is made. In FIG. 6, reference numeral 41 denotes a rotating shaft, reference numeral 42 denotes a magnetic steel sheet, and reference numeral 50 denotes a stator.

  In such a case, the eddy current EC1 generated in the (N-1) th magnet unit 43 is conducted to the Nth magnet unit 43 via the (N-1) th scattering prevention ring 45, and further the Nth scattering. Conduction to the (N + 1) th magnet unit 43 is made through the prevention ring 45. Similarly, the eddy current EC2 generated in the (N-1) th scattering prevention ring 45 is conducted to the Nth scattering prevention ring 45 via the Nth magnet part 43, and further, the N + 1th magnet part 43 is connected to the N + 1th scattering prevention ring 45. Thus, the continuity to the (N + 1) th scattering prevention ring 43 is established.

  In FIG. 6, N is an integer of 2 or more, the N−1th magnet portion 43 is represented as “43 (N−1)”, and the Nth magnet portion 43 is represented as “43 (N)”. The (N + 1) th magnet part 43 is represented as “43 (N + 1)”. Similarly, the (N-1) th scattering prevention ring 45 is represented as “45 (N−1)”, the Nth scattering prevention ring 45 is represented as “45 (N)”, and the (N + 1) th scattering prevention ring 45 is denoted as “45 (N−1)”. 45 (N + 1) ".

  On the other hand, in this embodiment, the eddy current EC generated in the (N-1) th magnet portion 14 is conducted to the (N-1) th anti-scattering ring 16, but the insulating coatings 14b and 16b and the space 15 exist. , It does not conduct to the Nth magnet portion 14 and does not conduct to the Nth scattering prevention ring 16. Similarly, the eddy current EC generated in the Nth magnet unit 14 is conducted to the Nth scattering prevention ring 16, but since the insulating coatings 14b and 16b and the space 15 exist, the eddy current EC is transferred to the (N + 1) th magnet unit 14. Is not conducted, and is not conducted to the (N + 1) th scattering prevention ring 16.

  The same applies to the eddy current generated in the scattering prevention ring 16. For example, the eddy current generated in the (N-1) th anti-scattering ring 16 is conducted to the (N-1) th magnet part 14, but since the insulating coatings 14b and 16b and the space 15 exist, the Nth magnet part. 14 is not conducted, and is not conducted to the Nth scattering prevention ring 16. Similarly, the eddy current generated in the Nth scattering prevention ring 16 is conducted to the Nth magnet portion 14, but since the insulating coatings 14 b and 16 b and the space 15 exist, the N + 1th magnet portion 14 is not connected. It does not conduct, nor does it conduct to the (N + 1) th scattering prevention ring 16.

  In this way, by forming the space 15 in addition to the insulating coatings 14b and 16b, even if there is a dimensional error or misalignment of the magnet portion 14 or the scattering prevention ring 16, due to the presence of the space 15, Since the eddy currents EC1 and EC2 as shown in FIG. 6 can be divided, conduction of the eddy current EC can be suppressed and eddy current loss can be reduced.

  Further, when the rotor 10 is manufactured using the anti-scattering ring 16 having the above-described configuration, a chamfer having an insulating coating 16d at the boundary between adjacent anti-scattering rings 16 on the outer peripheral surface side of the rotor 10. Surface 16c will be arranged.

  As described above, since the insulating coating 16d is arranged at the boundary between the adjacent anti-scattering rings 16, there is no insulating coating on the outer peripheral surface 16e (or the insulating coating formed on the outer peripheral surface 16e is peeled off). Even if the conductive material 18 such as iron powder exists at the boundary between the adjacent anti-scattering rings 16, eddy current conduction does not occur on the outer peripheral surface between the anti-scattering rings 16, and eddy current loss can be reduced. it can. For example, as shown in FIG. 2, even if the conductive material 18 exists at the boundary between adjacent scattering prevention rings 16, eddy current is conducted from the (N + 1) th scattering prevention ring 16 to the Nth scattering prevention ring 16. There is nothing.

  As described above, eddy current loss can be reduced.

  Further, the anti-scattering ring 16 is fitted into the outer periphery of the magnet portion 14 by press-fitting without using an adhesive and without using shrink fitting. FIG. 1 illustrates a state in the middle of fitting the anti-scattering ring 16 to the outer periphery of the magnet portion 14.

  When the anti-scattering ring 16 is fitted on the outer periphery of the magnet part 14, the magnet part 14 has a chamfered surface 14a, and the anti-scattering ring 16 has a chamfered surface 16a. In addition, the magnet portion 14 is less likely to be scratched, and it is possible to perform press fitting instead of shrink fitting. As a result, it is possible to shorten the working time. From the viewpoint of press-fitting work, as shown in FIG. 3, it is desirable that the chamfered surface 14 a is provided at least on the side surface (right side in the drawing) opposite to the press-fitting direction side in the magnet portion 14. 16a is desirably provided at least on the side surface (left side in the drawing) of the anti-scattering ring 16 on the side of the press-fitting direction.

  Also, the chamfered surface 16c and the insulating coating 16d are provided only on one side surface of the anti-scattering ring 16, that is, on the side surface side (left side in the drawing) of the press-fitting direction, and not on the other side surface side. . Thereby, when using a press-fitting jig for press-fitting the anti-scattering ring 16, the contact area between the other side and the press-fitting jig can be increased, and the surface pressure applied to the other side can be reduced, When the insulating coating 16b is provided on the other side surface, the peeling can be prevented.

  Thus, by fitting the anti-scattering ring 16 to the outer periphery of the magnet part 14, the magnet part 14 can be prevented from scattering and the centrifugal force resistance of the rotor 10 can be improved. As a result, the permanent magnet type rotating electrical machine of this embodiment can cope with high speed rotation and high fluctuation torque.

  As such a scattering prevention ring 16, a titanium-based material (for example, titanium alloy) is desirable. Titanium is lightweight, high in strength, and has a thermal expansion coefficient equivalent to that of a permanent magnet. Therefore, even under high temperatures, there is no occurrence of cracking due to stress or misalignment due to expansion, preventing scattering of the magnet portion 14, And sufficient intensity | strength can be ensured as a ring which fixes a position.

  Therefore, in this embodiment, since the eddy current loss in the magnet portion 14 and the anti-scattering ring 16 can be reduced even at high speed rotation or when highly fluctuating torque is generated, the magnet portion 14 caused by eddy current loss can be reduced. Thermal demagnetization and motor performance degradation can be prevented. In addition, the increase in centrifugal resistance by the anti-scattering ring 16 makes it possible to increase the speed.

  In addition, since a jig such as a spacer for creating a gap is unnecessary in the manufacturing process, the jig cost can be reduced. Further, in the manufacturing process, the scattering prevention ring 16 is fitted using press-fitting instead of shrink fitting, so that the manufacturing process can be simplified. In addition, since the anti-scattering ring 16 does not need to be provided with an insulating coating on the outer peripheral surface 16e, the film forming cost of the insulating coating can be reduced, and the manufacturing cost for protecting the outer peripheral surface of the rotor 10 can be reduced. it can.

  Note that the chamfered surfaces 14a, 16a, and 16c described above may be curved surfaces, for example, curved surfaces that smoothly connect adjacent surfaces, instead of flat surfaces. Further, instead of the insulating coatings 14b and 16b, an insulating material may be sandwiched between the magnet portions 14 and between the anti-scattering rings 16.

  In addition, here, the configuration including both the communicating space 15 (spaces 15a and 15b) and the insulating coating 16d formed on the chamfered surface 16c is shown, but the eddy current loss may be achieved even with either configuration. Can be reduced.

[Example 2]
The permanent magnet type rotating electrical machine of the present embodiment will be described with reference to FIGS. In addition, the permanent magnet type rotating electrical machine of the present embodiment is different from the permanent magnet type rotating electrical machine shown in Embodiment 1 in the configuration of part of the magnet portion 14 and / or part of the scattering prevention ring 16, Since the other configurations are the same, the same reference numerals are given to the configurations equivalent to those of the permanent magnet type rotating electric machine shown in the first embodiment, and the duplicate description is omitted.

  Also in this embodiment, in order to reduce eddy current loss, the configuration of the magnet portion 14 and the scattering prevention ring 16 is devised.

  Specifically, as shown in FIG. 4, in the magnet portion 14, an insulating coating 14 c (second chamfered surface insulating portion) is further provided on the chamfered surface 14 a and an outer peripheral surface (surface on the scattering prevention ring 16 side). ) Is provided with an insulating coating 14d (outer peripheral surface insulating portion). That is, the insulating coating 14c and the insulating coating 14d are further added to the magnet portion 14 of the first embodiment.

  As shown in FIG. 4, in the scattering prevention ring 16, an insulating coating 16f (first chamfered surface insulating portion) is further provided on the chamfered surface 16a, and an inner peripheral surface (surface on the magnet unit 14 side). An insulating coating 16g (inner peripheral surface insulating portion) is provided. That is, the insulating coating 16f and the insulating coating 16g are further added to the scattering prevention ring 16 of the first embodiment.

  In the present embodiment, if either one of the magnet portion 14 or the scattering prevention ring 16 is configured as shown in FIG. 4B or FIG. 4C, the other is shown in FIG. 2B or FIG. Even the configuration shown in FIG. 3C may be the configuration shown in FIG. 3B or FIG.

  That is, at least one of the insulating coating 14d of the magnet portion 14 and the insulating coating 16g of the anti-scattering ring 16 may be provided. The insulating coating 14c of the magnet portion 14 and the insulating coating 16f of the anti-scattering ring 16 are preferably from the viewpoint of press-fitting described later, but from the viewpoint of eddy current, the communicating space 15 (spaces 15a and 15b). ) Can be formed, it is not always necessary. In addition, in FIG. 5, the structure combined with the magnet part 14 (refer FIG.2 (b)) shown in Example 1 is illustrated as an example of the combination mentioned above.

  As described above, also in this embodiment, it is only necessary to form an insulating coating on a part of the surfaces of the magnet portion 14 and the scattering prevention ring 16, and it is not necessary to form an insulating coating on all surfaces, and the insulating coating is formed. Cost can be reduced. Further, as the above-described insulating coatings 14c, 14d, 16f, and 16g, a ceramic film, a resin film, a DLC film, and the like can be applied as in the first embodiment, and a DLC film is particularly preferable.

  In the present embodiment, in the adjacent magnet portions 14, when the chamfered surface 14a has the insulating coating 14c, one or both of the chamfered surfaces 14a and the insulating coating 14c form a space 15a. Similarly, in the adjacent anti-scattering rings 16, when the chamfered surface 16a has the insulating coating 16f, one or both of the chamfered surfaces 16a and the insulating coating 16f form a space 15b.

  Therefore, in this embodiment, the eddy current ECm generated in the magnet portion 14 does not conduct to the other adjacent magnet portion 14 because the insulating coating 14b exists, and the insulating coating 14d and / or the insulating coating 16g. Further, since the space 15 exists, it does not conduct to the adjacent anti-scattering ring 16. Similarly, the eddy current ECr generated in the anti-scattering ring 16 does not conduct to other adjacent anti-scattering rings 16 because of the presence of the insulating coating 16b, and the insulating coating 14d and / or the insulating coating 16g or space. Since 15 exists, it does not conduct to the adjacent magnet part 14.

  In this way, by forming the insulating coatings 14d and 16g in addition to the insulating coatings 14b and 16b and the space 15, even if there is a dimensional error or misalignment of the magnet portion 14 or the scattering prevention ring 16, the insulating coating 14b and 16b are formed. Due to the presence of the coatings 14d and 16g and the space 15, the eddy currents ECm and ECr can be prevented from conducting to other adjacent magnet portions 14 and the scattering prevention ring 16, and eddy current loss can be reduced.

  As described above, the present embodiment has the same effect as that of the first embodiment, and can further reduce the eddy current loss described in the first embodiment. As a result, it is possible to further prevent thermal demagnetization of the magnet portion 14 and motor performance degradation due to eddy current loss.

  Further, in this embodiment, in the magnet portion 14, an insulating coating 14 c is formed on the chamfered surface 14 a, and an insulating coating 14 d is formed on the outer peripheral surface thereof. In the anti-scattering ring 16, the chamfered surface 16 a An insulating coating 16f is formed, and an insulating coating 16g is formed on the inner peripheral surface thereof. When these insulating coatings 14c, 14d, 16f, and 16g are DLC films, they are excellent not only in electrical insulation but also in sliding properties and low friction properties. Can be more easily fitted, and as a result, the working time can be further reduced.

  Here, the configuration including both the communicating space 15 (spaces 15a and 15b) and the insulating coating 16d formed on the chamfered surface 16c is shown, but eddy current loss may be achieved even with either configuration. Can be reduced.

  The present invention is suitable for a surface-attached permanent magnet type rotating electrical machine, a so-called SPM motor, and can be used for, for example, a motor for a dynamometer for performance / endurance testing of a drive system component such as a transmission.

DESCRIPTION OF SYMBOLS 10 Rotor 11 Rotating shaft 14 Magnet part 14a Chamfering surface 14b, 14c, 14d Insulation coating 15 (15a, 15b) Space 16 Scatter prevention ring 16a Chamfering surface 16b Insulating coating 16c Chamfering surface 16d Insulating coating 16e Outer peripheral surface 16f, 16g Insulating coating 20 Stator

Claims (3)

A plurality of permanent magnets in which one set is annularly attached, and a plurality of sets are arranged along the axial direction of the rotor;
A plurality of annular members press-fitted along the axial direction on the outer periphery of a plurality of sets of the magnet portions;
The annular member includes a first side surface insulating portion provided on one or both side surfaces in contact with the other adjacent annular member, a chamfered surface provided between an outer peripheral surface and one of the side surfaces, A permanent magnet type rotating electrical machine having a chamfered surface insulating portion provided on a chamfered surface. In the permanent magnet type rotating electrical machine according to claim 1,
The chamfered surface is a flat surface or a curved surface. In the permanent magnet type rotating electrical machine according to claim 1 or 2,
The chamfered surface is provided on the press-fitting direction side of the permanent magnet type rotating electrical machine.

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