JP4248887B2 - Permanent magnet rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a permanent magnet rotor in which a permanent magnet is embedded in a rotor iron core.
[0002]
[Prior art]
As a rotor used in a rotating electrical machine such as an electric motor or a generator, a permanent magnet rotor in which a permanent magnet is embedded in a rotor core is known (see, for example, Patent Document 1 and Patent Document 2). For example, as shown in FIG. 7, a conventional permanent magnet rotor is provided with a large number of salient pole portions 91 on the outer peripheral portion of a rotor core 90 formed by laminating a large number of silicon steel plates, and the rotor core 90 is provided on each salient pole portion 91. Magnet insertion holes 92 penetrating in the axial direction are provided, and permanent magnet pieces 93 are inserted and arranged in the respective magnet insertion holes 92. Here, in the salient pole portion 91, the width dimension t of a portion (hereinafter referred to as a holding portion) 94 located on the outer side in the circumferential direction of the magnet insertion hole 92 is narrowed in order to reduce the leakage magnetic flux in the rotor. Is preferable (see, for example, Patent Document 3).
[0003]
[Patent Document 1]
JP-A-5-284680 [Patent Document 2]
JP-A-6-269140 [Patent Document 3]
JP 2002-209350 A
[Problems to be solved by the invention]
However, the holding portion 94 is a portion where stress due to centrifugal force concentrates when the permanent magnet rotor rotates, and if the width dimension t of the holding portion 94 is too small, the mechanical strength is lowered. However, if the width t of the holding portion 94 is increased by giving priority to the mechanical strength, the magnetic flux of the permanent magnet piece 93 is short-circuited, and the heat generated by the magnet is increased, which is disadvantageous.
Accordingly, the present invention provides a permanent magnet rotor that has excellent magnetic properties, can suppress heat generation, and has sufficient mechanical strength.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 has a salient pole part (for example, salient pole part 23 in an embodiment described later) on the outer peripheral part, and a magnet insertion hole (for example, A rotor iron core (for example, a rotor yoke 20 in an embodiment described later) provided with a magnet insertion hole 24 in an embodiment described later, and a permanent magnet piece (for example, an embodiment described later) inserted in the magnet insertion hole. Permanent magnetic pole piece 40) and end face plates (for example, end face plates 30A and 30B in the embodiments described later) disposed along the end face of the rotor core and closing the magnet insertion hole. In a rotor (for example, a permanent magnet type rotor 1 in an embodiment described later), the end face plate has a plurality of locking claws (for example, an embodiment described later) projecting in the axial direction of the rotor core on the outer peripheral portion. It includes a locking claw 34) in the form, the locking pawl, characterized in that is engaged with the outer peripheral surface of the salient pole portion.
[0006]
With this configuration, when a force pulling radially outward acts on the rotor iron core and the permanent magnet piece by centrifugal force, the engaging claws of the end face plate can resist this force. That is, part of the stress due to the centrifugal force can be received by the engaging claws of the end face plate, so that the stress in the holding part adjacent to the magnet insertion hole can be reduced and the width of the holding part can be reduced. it can.
[0007]
The invention according to claim 2 is the invention according to claim 1, wherein a step portion (for example, a step portion 26 in an embodiment described later) is provided at an end portion of the outer peripheral surface of the salient pole portion. The locking claws are locked to each other.
By comprising in this way, the latching claw of an end surface plate does not protrude from the outer peripheral surface of a salient pole part.
[0008]
The invention according to claim 3 has a salient pole portion (for example, salient pole portion 23 in an embodiment described later) on the outer peripheral portion, and a magnet insertion hole (for example, magnet insertion in an embodiment described later) in the salient pole portion. A rotor iron core (for example, a rotor yoke 20 in an embodiment described later) provided with a hole 24), a permanent magnet piece (for example, a permanent magnetic pole piece 40 in an embodiment described later) inserted into the magnet insertion hole, A permanent magnet rotor (for example, later-described implementation) including an end surface plate (for example, end-surface plates 30A and 30B in the embodiments described later) disposed along the end surface of the rotor core and closing the magnet insertion hole. In the permanent magnet rotor 1) according to the embodiment, the end face plate includes a plurality of locking claws (for example, locking claws 35 in the embodiments described later) protruding in the axial direction of the rotor iron core, Locking pawl, wherein the magnet insertion into successively formed nail insertion holes of the rotor core (e.g., nail insertion hole 27 in the embodiment described below) is inserted into is inserted into the magnet insertion holes The permanent magnet piece is locked to the outer peripheral surface on the radially outer side.
[0009]
With such a configuration, when a force pulling radially outward acts on the permanent magnet piece by centrifugal force, the engaging claw of the end face plate can resist this force. That is, part of the stress due to the centrifugal force can be received by the engaging claws of the end face plate, so that the stress in the holding part adjacent to the magnet insertion hole can be reduced and the width of the holding part can be reduced. it can.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a permanent magnet rotor according to the present invention will be described below with reference to the drawings of FIGS.
FIG. 1 and FIG. 2 are a plan view and an exploded perspective view of a permanent magnet type rotor (hereinafter abbreviated as “rotor”) 1 according to the present invention that can be used in a rotating electrical machine such as an electric motor or a generator.
The rotor 1 includes a rotor 10, a rotor yoke (rotor core) 20, a pair of end face plates 30A and 30B, and a large number of permanent magnetic pole pieces 40.
[0011]
The rotor 10 has a hollow drum shape and is integrally formed by casting or forging, and is chamfered for guiding when the rotor yoke 20 is press-fitted at a corner portion between the outer peripheral surface 11 and the one end surface 12 of the cylindrical rotor. 12a is formed, and on the other hand, an end face plate 30A is abutted against an extending portion 13a provided to extend outward from the other end face 13 at a corner that becomes a boundary portion between the outer peripheral face 11 and the other end face 13 of the rotor. A relief groove 13b is formed. Three grooves 14 are formed on the outer peripheral surface 11 of the rotor along the axial direction at equal intervals in the circumferential direction.
[0012]
The end plates 30A and 30B are exactly the same, but their mounting directions along the axial direction are reversed. Here, the end face plate 30A will be described, and the description of the end face plate 30B will be omitted. The end face plate 30A has an annular shape, and the inner diameter of the hole 32 formed in the center of the plate portion 31 is slightly smaller than the outer diameter of the outer peripheral face 11 of the rotor 10 for press-fitting. In addition, three protrusions 33 are provided radially inwardly at the inner peripheral end of the plate portion 31, and a number of locking claws 34 are perpendicular to the thickness direction at predetermined intervals in the outer peripheral end. It is provided to stand up. That is, the locking claw 34 protrudes along the axial direction of the end face plate 30A. The end plates 30A and 30B are made of, for example, austenitic stainless steel SUS304, which is a non-magnetic material.
[0013]
The rotor yoke 20 is formed by laminating a number of electromagnetic steel plates 28 having the same shape and the same dimensions, and has an annular shape. A through hole 21 into which the rotor 10 is inserted is provided at the center of the rotor yoke 20, and three protrusions 22 are provided at equal intervals in the circumferential direction on the inner peripheral surface thereof.
The rotor yoke 20 is provided with a large number of salient pole portions 23 on the outer peripheral portion thereof, and a magnet insertion hole 24 into which the permanent magnet piece 40 is inserted is provided on the base side of each salient pole portion 23.
[0014]
As shown in FIG. 3, the width dimension t of the portion (hereinafter referred to as a holding portion) 25 located on the outer side in the circumferential direction of the magnet insertion hole 24 in the salient pole portion 23 is to suppress a short circuit of the magnetic flux of the permanent magnetic pole piece 40. In order to suppress heat generation, and extremely small, it is set to be extremely small. Further, at both ends in the circumferential direction of the outer peripheral end of each salient pole portion 23 of the rotor yoke 20, the width dimension is substantially the same as the locking claw 34 of the end face plates 30A and 30B, and the depth dimension is substantially the same as the thickness of the locking claw 34. The formed step portions 26 and 26 are provided.
[0015]
The rotor 1 is assembled as follows, for example.
First, the end face plate 30 </ b> A is press-fitted into the outer peripheral face 11 of the rotor 10 from the one end face 12 side of the rotor 10. At that time, the protrusion 33 of the end face plate 30 </ b> A is press-fitted while being engaged with the groove 14 of the outer peripheral surface 11 of the rotor 10.
Next, the rotor yoke 20 is press-fitted and fitted into the outer peripheral surface 11 of the rotor 10 from the one end surface 12 side of the rotor 10. At that time, the protrusion 22 of the rotor yoke 20 is press-fitted while being engaged with the groove 14 of the outer peripheral surface 11 of the rotor 10. In this manner, the protrusions 33 and 22 are press-fitted while being engaged with the groove 14, so that the protrusion 33 of the end face plate 30A and the protrusion 22 of the rotor yoke 20 are arranged to coincide with each other, and as shown in FIG. Each of the locking claws 34 is locked to the step portion 26 of the salient pole portion 23 of the rotor yoke 20. As a result, the locking claw 34 is locked to the outer peripheral surface of the salient pole portion 23.
[0016]
Subsequently, one permanent magnetic pole piece 40 is inserted into each magnet insertion hole 24 of the rotor yoke 20, and then the end face plate 30 </ b> B is press-fitted into the outer peripheral face 11 of the rotor 10 from the one end face 12 side of the rotor 10. . At that time, the protrusion 33 of the end face plate 30 </ b> B is press-fitted while being engaged with the groove 14 of the outer peripheral surface 11 of the rotor 10. Accordingly, similarly to the end face plate 30A, the protrusions 33 of the end face plate 30B and the protrusions 22 of the rotor yoke 20 are arranged to coincide with each other, and each locking claw 34 of the end face plate 30B has a stepped portion 26 of the salient pole portion 23 of the rotor yoke 20. It is locked to. Thereby, the locking claw 34 of the end face plate 30 </ b> B is also locked to the outer peripheral surface of the salient pole portion 23.
[0017]
By assembling as described above, the rotor 10, the rotor yoke 20, the permanent magnetic pole piece 40, and the end face plates 30A, 30B are integrated, and the rotor 1 as shown in FIG. 1 is completed. In the rotor assembled in this way, both end openings of each magnet insertion hole 24 are blocked by the end face plates 30A and 30B, and the permanent magnetic pole piece 40 is prevented from being detached from the rotor yoke 20. Note that the locking claws 34 are locked only to the step portions 26 of the plurality of electromagnetic steel plates 28 disposed in the vicinity of both ends in the axial direction of the rotor yoke 20, and the steps of the electromagnetic steel plates 28 disposed in the central portion in the axial direction. The part 26 is not locked. By comprising in this way, it is not necessary to prepare multiple types of electromagnetic steel plates 28 , and it is possible to use only one type.
[0018]
In the rotor 1 configured as described above, the protrusion 22 of the rotor yoke 20 and the protrusion 33 of the end face plates 30A and 30B are engaged with the groove 14 of the rotor 10, and the engaging claws of the end face plates 30A and 30B are further engaged. Since 34 is locked to the step portion 26 formed on the outer periphery of the rotor yoke 20, the rotor 10, the rotor yoke 20, and the end face plates 30A and 30B are not displaced from each other in the circumferential direction.
[0019]
Further, since the engaging claws 34 of the end face plates 30A and 30B are engaged with the step portion 26 formed on the outer periphery of the rotor yoke 20, the salient pole portion 23 of the rotor yoke 20 is caused by the centrifugal force when the rotor 1 rotates. When a force pulling radially outward acts on the permanent magnet piece 40, the locking claws 34 of the end face plates 30A and 30B and the holding portion 25 of the rotor yoke 20 counteract this force and prevent the holding portion 25 from being damaged. . That is, part of the stress due to the centrifugal force is received by the locking claws 34 of the end face plates 30A and 30B, so that the stress in the holding portion 25 of the rotor yoke 20 can be reduced. As a result, the width dimension t of the holding part 25 can be reduced.
Since the locking claw 34 is locked to the step portion 26, the outer surface of the locking claw 34 and the outer peripheral surface of the salient pole portion 23 are flush with each other, and the gap between the stator of the rotating electrical machine and the rotor yoke 20 is widened. You don't have to.
[0020]
Therefore, in the rotor 1, the mechanical strength of the rotor 1 can be sufficiently increased even if the width dimension t of the holding portion 25 is reduced. In other words, the mechanical strength of the rotor 1 can be increased without increasing the width dimension t of the holding portion 25. Moreover, since the width dimension of the holding | maintenance part 25 can be made small, the short circuit of the magnetic flux of the permanent magnetic pole piece 40 can be suppressed, and heat_generation | fever can be suppressed.
[0021]
In the above-described embodiment, the stepped portion 26 is provided in the salient pole portion 23 of the rotor yoke 20, and the locking claws 34 of the end face plates 30A and 30B are locked to the stepped portion 26. As shown in FIG. Then, a notch is made in a predetermined portion of the plate portion 31 of the end face plates 30A and 30B, and a portion surrounded by the notch is projected in the axial direction to form a locking claw 35. As shown in FIG. A claw insertion hole 27 bulging radially outward is provided at both ends of each magnet insertion hole 24, and the locking claw 35 is provided at both ends of the outer peripheral surface of the permanent magnetic pole piece 40 on the radially outer side. You may make it latch on.
[0022]
In this way, when a force pulling radially outward acts on the permanent magnet piece 40 due to the centrifugal force when the rotor 1 rotates, the locking claws 35 of the end face plates 30A, 30B counteract this force. The permanent pole piece 40 is prevented from moving radially outward. As a result, the force pulling the permanent magnetic pole piece 40 radially outward does not act on the salient pole portion 23 of the rotor yoke 20, and stress due to the centrifugal force in the holding portion 25 can be reduced. Can be reduced.
Therefore, even with this configuration, the mechanical strength of the rotor 1 can be increased without increasing the width dimension t of the holding portion 25, and the width dimension of the holding portion 25 can be reduced. Therefore, the short circuit of the magnetic flux of the permanent magnetic pole piece 40 can be suppressed, and heat generation can be suppressed.
[0023]
【The invention's effect】
As described above, according to the first aspect of the present invention, a part of the stress due to the centrifugal force can be received by the engaging claw of the end face plate, so that the stress of the holding portion adjacent to the magnet insertion hole is reduced. And the width of the holding portion can be reduced. Therefore, the mechanical strength of the permanent magnet rotor can be sufficiently increased without increasing the width dimension of the holding portion, and the width dimension of the holding portion can be reduced to short-circuit the magnetic flux of the permanent pole piece. The effect that it can suppress can be suppressed and heat_generation | fever can be suppressed is show | played.
[0024]
According to the second aspect of the invention, in addition to the effect of the first aspect, the engaging claw of the end face plate does not protrude from the outer peripheral surface of the salient pole portion, so that the gap between the rotor iron core and the stator is not widened. It has the effect of being finished.
[0025]
According to the invention of claim 3, since a part of the stress due to the centrifugal force can be received by the engaging claws of the end face plate, the stress of the holding portion adjacent to the magnet insertion hole can be reduced, and the holding portion The width dimension can be reduced. Therefore, the mechanical strength of the permanent magnet rotor can be sufficiently increased without increasing the width dimension of the holding portion, and the width dimension of the holding portion can be reduced to short-circuit the magnetic flux of the permanent pole piece. The effect that it can suppress can be suppressed and heat_generation | fever can be suppressed is show | played.
[Brief description of the drawings]
FIG. 1 is a plan view of a permanent magnet type rotor according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the permanent magnet rotor according to the first embodiment.
FIG. 3 is a cross-sectional view of a main part of the permanent magnet rotor according to the first embodiment.
FIG. 4 is an external perspective view of a main part of the permanent magnet rotor according to the first embodiment.
FIG. 5 is an external perspective view of a main part of an end face plate used in a permanent magnet type rotor according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of a main part of the permanent magnet rotor according to the second embodiment.
FIG. 7 is a cross-sectional view of a main part of a conventional permanent magnet type rotor.
[Explanation of symbols]
1 Permanent magnet rotor 20 Rotor yoke (rotor core)
23 Salient pole part 24 Magnet insertion hole 26 Step part 30A, 30B End face plate 34, 35 Locking claw 40 Permanent magnetic pole piece

Claims (3)

A rotor core having a salient pole portion on the outer peripheral portion and provided with a magnet insertion hole in the salient pole portion, a permanent magnet piece inserted into the magnet insertion hole, and the magnet disposed along the end surface of the rotor core In a permanent magnet rotor provided with an end face plate that closes the insertion hole,
The end face plate has a plurality of locking claws protruding in the axial direction of the rotor iron core on the outer peripheral portion, and the locking claws are locked to the outer peripheral surface of the salient pole portion. Rotor. The permanent magnet rotor according to claim 1, wherein a step portion is provided at an end portion of the outer peripheral surface of the salient pole portion, and the locking claw is locked to the step portion. A rotor core having a salient pole portion on the outer peripheral portion and provided with a magnet insertion hole in the salient pole portion, a permanent magnet piece inserted into the magnet insertion hole, and the magnet disposed along the end surface of the rotor core In a permanent magnet rotor provided with an end face plate that closes the insertion hole,
The end face plate includes a plurality of locking claws protruding in the axial direction of the rotor core, and the locking claws are inserted into a claw insertion hole formed continuously to the magnet insertion port of the rotor core, A permanent magnet rotor, wherein the permanent magnet rotor is locked to a radially outer peripheral surface of a permanent magnet piece inserted into the magnet insertion hole.

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