JP2008099479A - Magnet-embedded type rotor in rotary electric machine, and the rotary electric machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet-embedded type rotor that prevents deterioration in efficiency by minimizing a leakage magnetic flux from the side ends of each magnet body, while preventing scattering of each salient-pole part and each magnet body which constitute the rotor (rotator), due to the centrifugal force, and to provide a rotary electric machine that uses the same. <P>SOLUTION: The magnet-embedded type rotor in a rotary electric machine is constituted of each salient pole part which is formed in a laminate made of a magnetic body, while being provided around a core body part, and each magnet body that is embedded in a slot formed between each salient pole part and the core-body part, while defining an air gap between the salient pole parts adjacent to each other. Each intermediate plate is interposed, at respective appropriate interval between the laminates, respectively made of a magnetic body, and each fixing plate is provided at both end parts in a rotating-axis direction in the rotor so as to fix the salient pole parts and the intermediate plates by respective salient-pole-part fixing means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnet-embedded rotor (rotor) in a rotating electrical machine and a rotating electrical machine using the rotor, and in particular, damage due to centrifugal force of salient pole portions provided corresponding to magnets embedded in the rotor. The present invention relates to a magnet-embedded rotor in a rotating electric machine and a rotating electric machine using the rotor, which can reduce leakage magnetic flux from a magnet side end while preventing the same.

  The motor using a magnet for the rotor is a laminate of a motor called a SPM (Surface Permanent Magnetic) motor with a magnet attached to the rotor surface and a magnetic steel plate called an IPM (Interior Permanent Magnetic) motor. There is a magnet-embedded motor in which slots are formed in the rotor core and magnets are embedded in the slots. In addition, the motor which used the magnet for these rotors can also be used as a generator by rotating the rotor with some force.

  Of these, SPM motors used as conventional servo motors are covered with a stainless steel tube so that the magnets do not scatter due to centrifugal force during high-speed rotation, so the iron loss at this part reduces the efficiency. It was. On the other hand, the magnet-embedded IPM motor has a magnet embedded on the rotor's rotating shaft side, so there is no fear of scattering due to centrifugal force, so there is no need to cover the stainless steel tube and the efficiency is improved. At the same time, since reluctance torque (force that the coil attracts iron) can be used in addition to magnet torque (coil / magnet attracting / repulsive force), high torque and low heat generation (efficiency) can be realized.

  However, this IPM motor also has an outer peripheral portion and an outer peripheral portion provided corresponding to each of the magnets embedded in the rotor (hereinafter, the outer peripheral portion provided corresponding to each of the magnets is a salient pole portion. If the steel plate exists between the two, the leakage magnetic flux is generated and the operation efficiency is lowered. On the other hand, when rotating at high speed, a structure is required to support the salient pole part and the magnet itself against the centrifugal force generated in the radial direction of the rotor. If the structure to be constructed is configured with the side wall on the end side of the salient pole portion of the slot that embeds the magnet of the magnetic steel sheet to be laminated, the steel plate exists on the side end of the magnet, resulting in leakage magnetic flux and lowering the operation efficiency Resulting in. In order to prevent this reduction in operating efficiency, it is only necessary to make the end of the magnet side of this steel sheet thinner. However, if this is done, the strength for supporting the magnet and the salient pole is insufficient, and centrifugal force is generated when the rotor is rotated at high speed. As a result, the salient poles may be scattered.

  Therefore, for example, in Patent Document 1, in order to improve the operation efficiency while maintaining the strength against the centrifugal force of the rotor iron core, as shown in FIG. 5, a salient pole provided with a slot 51 for arranging a magnetic body on an electromagnetic steel sheet. Portion 52, a rotor core 50 formed by punching a hole 53 for a caulking rivet on the rotating shaft side of this slot 51 and a hole 54 for a rotating shaft in the center, and an outer diameter D of 40 mm to 70 mm, a magnet The thickness d of the side wall provided at the end in the longitudinal direction of the slot 51 is set to 0.3 mm or more and less than 0.5 mm, and the rivet is passed through the hole 53 to minimize caulking and leakage magnetic flux. An embedded magnet motor is shown.

  In Patent Document 2, as shown in FIG. 6A, a magnetic steel sheet is punched, and two (a pair) magnets constituting one pole are separated from each other toward the outer peripheral surface side. An integrated core sheet 60 provided with an accommodation hole 61 for accommodating so as to be prepared, and a split core sheet 70 composed of an outer core piece 72 and an inner core piece 73 as shown in FIG. By configuring the rotor by sandwiching the split core sheet 70 with the integral core sheet 60, the magnetic characteristics between the magnets of different magnetic poles are the same as the magnetic characteristics of the magnetic portion 62 by the integral core sheet 60 and the split core sheet 70. Rotation having a magnet embedded rotor core that has a magnetic characteristic between the magnetic characteristics of non-existing non-magnetic portions 74 and reduces leakage flux between magnets without reducing the ability of the magnets and without using special members Machine is disclosed.

  Further, since the IPM motor can use reluctance torque in addition to magnet torque as described above, it can realize high torque and low heat generation (efficiency). Therefore, a rotating fluid such as a compressor, an expander or a fluid pump can be realized. By directly connecting a rotor to a machine via a connecting shaft, these rotary fluid machines can be configured in a small size and with high efficiency. Further, a magnet to be used is a rare earth magnet, particularly Nd—Fe—, instead of a ferrite magnet. B rare earth magnets are used.

  That is, rare earth magnets have a lower raw material cost because Nd, which is the main element, is more abundant than Sm than rare earth cobalt magnets and does not use a large amount of Co, and magnetic properties far exceed that of rare earth cobalt magnets. Therefore, it is widely used even in the field where hard ferrite was used.

JP-A-7-264785 JP 2006-158008 A JP-A-6-90543 JP-A-6-153441 JP 2000-88372 A

  However, the rotor of the magnet-embedded motor disclosed in Patent Document 1 has an outer diameter D of 40 mm to 70 mm and cannot be used to make a large motor, and the side wall thickness d of the slot 51 is set to 0. Although the thickness is set to 3 mm or more and less than 0.5 mm, the leakage of magnetic flux is caused by the side wall even at such a thickness, and the efficiency is deteriorated. Further, in order to support the salient pole portion 52 and the magnet against the centrifugal force generated by the rotation of the rotor, it is necessary to set the thickness d of the side wall to a thickness corresponding to the rotation speed or to limit the rotation speed. In the case of high-speed rotation, the thickness of the side wall must be increased accordingly, so that leakage of magnetic flux becomes large. Conversely, in order to reduce leakage of magnetic flux, high-speed rotation cannot be performed.

  Further, the rotating electrical machine shown in Patent Document 2 shows the magnetic characteristics between magnets of different magnetic poles, the magnetic characteristics of the magnetic part 62 by the integral core sheet 60, and the non-magnetic part 74 in which no magnetic material exists by the split core sheet 70. As a magnetic characteristic between the magnetic characteristics of the above, the magnetic flux leakage between the magnets is reduced without reducing the ability of the magnets and without using a special member. The leakage flux is only reduced, and the efficiency is still lowered because it is not lost.

  Therefore, in the present invention, the leakage magnetic flux from the magnet side end can be made very small while preventing the decrease in efficiency while preventing the salient pole part and the magnet from constituting the rotor (rotor) due to centrifugal force from scattering. An object is to provide a magnet-embedded rotor in a rotating electrical machine and a rotating electrical machine using the rotor.

In order to solve the above problems, a magnet-embedded rotor in a rotating electrical machine according to the present invention is:
Consists of a salient pole portion formed around a core portion formed of a laminate made of a magnetic body, and a magnet body embedded in a slot formed between the salient pole portion and the core portion. A magnet-embedded rotor having a gap between the salient pole parts,
An intermediate plate is interposed at appropriate intervals of the laminate made of the magnetic material, a fixed plate is provided at both ends of the rotor in the rotation axis direction, and the salient pole portion is fixed by the intermediate plate and the salient pole portion fixing means. It is characterized by that.

Moreover, the rotating electrical machine incorporating this rotor is
A stator in which a winding is wound around a plurality of teeth arranged in the circumferential direction, and salient poles that are rotatably accommodated in the stator and are provided around a core body portion that is formed of a laminated body made of a magnetic material. A rotating electric machine comprising a portion and a magnet body embedded in a slot formed between the salient pole portion and the core portion, and having a gap between adjacent salient pole portions,
The rotor is provided with intermediate plates at appropriate intervals of the laminate made of the magnetic material, and fixed plates are provided at both ends of the rotor in the rotation axis direction so that the salient pole portions are fixed to the intermediate plates and salient pole portion fixing means. It is characterized by being fixed with.

  In this way, by interposing an intermediate plate at appropriate intervals of the magnetic laminate, and fixing with the salient pole fixing means, centrifugal force generated when rotating at high speed is applied to the salient pole and magnet body. However, the force is transmitted from the salient pole fixing means to the intermediate plate and the fixed plate, and the intermediate plate and the fixed plate are pressed firmly so that the salient pole part and the magnet body are not scattered to prevent the rotor from being damaged. Can do. For this reason, a special structure for supporting the salient pole part is not required in the gap of the laminated magnetic body, so there is no need to limit the size of the rotating electrical machine or limit the rotational speed of the rotor. The degree of freedom is increased and it becomes easy to take measures against magnetic flux leakage.

  And the salient pole part fixing means passes through the salient pole part and the intermediate plate and is a shaft body fixed to the fixing plate, or the salient pole part fixing means is the salient pole part and the intermediate plate, and In a preferred embodiment of the present invention, the fixing plate is integrally welded or bonded.

  Further, the laminated body made of the magnetic body is provided with a support portion that extends radially from the gap portion in the core body portion and couples the salient pole portions, and the core body portion and the salient pole portions are integrated. By forming it, a laminated body exists on the air gap side of the magnet body.For example, by extending this from the approximate center of the salient pole part and the salient pole part, the support part becomes far from the magnet body, and the magnetic flux Leakage does not have a significant effect, and workability in rotor assembly is improved.

  And the core body and the salient pole part are configured separately, and a slot for embedding the magnet body is formed on the core body part side of the salient pole part and the salient pole part side of the core body part, By forming the intermediate plate in a ring shape and forming the slot for embedding the magnet body on the inner periphery of the intermediate plate, there is no need to provide a structure in which the core body portion and the salient pole portion are integrated in the gap portion, and magnetic flux leakage For example, the salient pole part and the core part are formed of different materials, or the salient pole part is a laminated body made of a magnetic material. It can also be configured as the thickness of the intervening interval, and the assembly of the rotor is improved accordingly.

  Furthermore, if the outer circumference of the rotor is made substantially circular by filling the gap between the adjacent salient pole portions with a resin or covering the outer circumference of the rotor with a non-magnetic sheet, the gap prevents resistance and noise generated during rotation of the rotor. In addition, if it is airtight, a rotor in a rotating electrical machine that can be used in a gas or lubricating oil having a high chemical activity or a mixed system thereof described in Patent Document 3 and Patent Document 4 You can also

  In addition, since the magnet is a rare earth permanent magnet, the raw material cost is low and the magnetic characteristics are far superior to those of the rare earth cobalt magnet, so that a small and inexpensive magnet embedded rotor and rotating electrical machine can be provided.

  As described above, the magnet-embedded rotor in the rotating electrical machine according to the present invention and the rotating electrical machine using the rotor prevent the salient poles and the magnet body from constituting the rotor (rotor) due to centrifugal force from being scattered, It is possible to provide a rotating electrical machine that can extremely reduce the leakage magnetic flux from the end and improve the efficiency.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. .
[Example 1]

  FIG. 1 is a diagram for explaining a schematic configuration of a magnet-embedded rotor in a rotating electric machine according to the present invention and a first embodiment of the rotating electric machine using the rotor, and (A) shows a motor or a generator. The figure which looked at the stator 1 and the rotor 2 from the rotating shaft 3 direction, (B) is a top view of the steel plate 23 for rotors formed with the electromagnetic steel plate which comprises the laminated body in the rotor 2, (C) is this (B) (D) is a plan view of a fixing plate provided at both ends of the rotor 2 in the rotation axis direction, and (E) is a laminated steel plate 23 for rotors. FIG. 4F is a side view of the rotor 2, and FIG.

  As shown in FIG. 1 (A), the rotating electrical machine having the magnet embedded rotor 2 according to the present invention is formed into a ring shape, and is slotted into a plurality of teeth 11 arranged in the circumferential direction on the inner peripheral side thereof. A laminated body is formed by a stator 1 having a winding wound through 12 and a rotor steel plate 23 formed of an electromagnetic steel plate such as a silicon steel plate, and a magnet body 21 using, for example, ferrite or preferably a rare earth is embedded. A salient pole portion 22 is provided on the outer peripheral side, and the rotor 2 is supported by the rotor rotation shaft 3 so as to be rotatable with respect to the stator 1. In the following description, the present invention will be described as a magnet-embedded motor. However, as described above, the magnet-embedded motor of the present invention can be used as a generator by rotating the rotor 2 using, for example, wind power. Can be used. A control circuit for rotating the magnet-embedded motor according to the present invention is the same as the control circuit disclosed in Patent Document 1 and will not be described.

As shown in the side view of FIG. 1 (F), the rotor 2 is provided with intermediate plates 24 at appropriate intervals between a plurality of laminated steel plates 23 for rotors, and fixed plates at both ends in the rotational axis direction. 25 is provided. Then, between the fixed plate 25 ₁ in the rotation axis direction one end side of the fixing plate 25 ₂ of the other end, the salient pole section fixing holes 221 provided in the salient pole portions 22 as described later, the intermediate plate 24 The salient pole part fixing means 26 is preferably fixed to the fixing plates 25 ₁ , 25 ₂ through the provided salient pole part fixing holes 241, preferably by means of bolts, rivets, or pins using a magnetic material. A gap 236 (see FIG. 1C) is formed between the portion 22 and the salient pole portion 22. The salient pole fixing means 26 fixes the salient poles by welding or bonding the rotor steel plates 23, intermediate plates 24, and fixing plates 25 in addition to the bolts, rivets or pins. You may make it do. In addition, a gap provided between the rotor 2 and the stator 1 indicated by 27 is a refrigerant passage through which a refrigerant for cooling the heating of the rotor 2 and the stator 1 is passed.

By fixing the salient pole part 22 in this way, even if a centrifugal force generated by the rotation of the rotor 2 is applied to the salient pole part 22, the centrifugal force is intermediately interposed via the salient pole part fixing means 26. It is transmitted to the plate 24 and further transmitted to the fixing plates 25 ₁ and 25 ₂ to prevent the salient pole portion 22 from scattering against the centrifugal force. For this reason, there is no need to limit the size of the rotating electrical machine or limit the rotational speed of the rotor as disclosed in Patent Document 1, increasing the degree of freedom in designing the rotor shape, and facilitating countermeasures against magnetic flux leakage. An efficient rotating electrical machine with little leakage can be obtained.

  The rotor steel plate 23 in the rotor 2 is shown in FIG. 1 (B), the fixed plate 25 in FIG. 1 (D), and the intermediate plate 24 in FIG. 1 (E). In the side view of FIG. 1 (F), the rotor steel plates 23 between the intermediate plates 24 are not shown separately. However, for example, about 20 sheets are laminated between the intermediate plates 24. The number of sheets is increased or decreased according to the strength of the centrifugal force depending on the outer diameter and the rotational speed of the rotor 2.

  The rotor steel plate 23 shown in FIG. 1 (B) is formed by pressing an electromagnetic steel plate such as a silicon steel plate of about 0.35 to 0.5 mm, for example, and in the illustrated example, a center portion (core body portion) 231 is formed. Is formed in a substantially hexagonal shape, and a slot 233 and a salient pole portion 22 in which the magnet body 21 is disposed are provided on each side forming the hexagonal shape on the outer peripheral side. The central portion (core body portion) 231 is provided with a rotation shaft hole 235 of the rotor 2 and a central portion fixing hole 232 corresponding to each slot 233. In addition, in the salient pole portion 22 provided on the outer peripheral side of the slot 233, when the salient pole portion fixing means 26 is a shaft body, salient pole portion fixing holes 221 that penetrate the salient pole portion fixing means 26 are provided on both side portions of the salient pole portion. On the side.

  And in the rotary electric machine of this Example 1, between each salient pole part 22 and salient pole part 22 in steel plate 23 for rotors, the (circle) part which attached the code of a to Drawing 1 (B) was expanded and shown. As shown in FIG. 1C, the salient pole portion 22 and the center portion 231 are connected, and the center of the center portion 231 between the adjacent salient pole portions 22 is radially extended to the outer peripheral side as a foot portion. In the illustrated example in which the salient pole portions 22 and the central portion 231 are coupled, a substantially Y-shaped support portion 234 is formed, and the outer peripheral side of the support portion 234 is the refrigerant passage 27 described above. In addition, although this support part 234 is shown thickly in FIG.1 (C), it is preferable to set it as thin as possible, for example to about 0.5 mm, and forming the steel plate 23 for rotors with a press. In this example, the support portion 234 is substantially Y-shaped, but may be substantially T-shaped.

  Therefore, when the magnet body 21 is disposed in the slot 233 of FIG. 1C as indicated by a dotted line, the support portion 234 is formed at a position away from the side of the salient pole portion 22 in the magnet body 21. Although there is a foot portion, there is no magnetic steel sheet in contact with the magnet body 21 as in Patent Document 1, and the gap 236 is formed, so that the amount of magnetic flux leaking is reduced and the efficiency is improved.

  The fixing plate 25 shown in FIG. 1 (D) is not provided with a gap corresponding to the gap 236 in the rotor steel plate 23 shown in FIG. 1 (B), and is provided with a recess serving as the refrigerant passage 27 on the outer peripheral side. If the outermost outer periphery is formed in the same shape as the rotor steel plate 23 and the salient pole fixing means 26 is a shaft body such as a bolt located at both axial ends of the rotor 2 as described above, In addition to being fixed, it has a role of preventing the entry of dust such as oil or scraped iron powder into the gap 236 or the slot 233 in the rotor 2. The salient pole portion fixing hole 251 is provided at the same position as the salient pole portion fixing hole 221 provided in the salient pole portion 22 of the rotor steel plate 23, and the center portion fixing hole 252 is provided at the center side of the salient pole portion 22. And the hole 255 for rotating shafts is provided in the center part, and it makes it by the thickness of about 0.5-2.0 mm using a nonmagnetic material.

  The fixing plate 25 has the rigidity of the portion indicated by 258 in FIG. 1D to a force such as centrifugal force from the corresponding portion of the rotor steel plate 23, that is, the portion where the salient pole portion 22 is formed. Since it has a strong structure, the salient pole part 22 can be firmly supported against the centrifugal force applied to the salient pole part 22 by the rotation of the rotor 2.

  The intermediate plate 24 shown in FIG. 1 (E) becomes the above-described refrigerant passage 27 without providing a gap corresponding to the gap 236 in the rotor steel plate 23, like the fixing plate 25 shown in FIG. 1 (D). A recess is provided, and the outermost periphery is formed in the same shape as the rotor steel plate 23. Then, when the salient pole portion fixing means 26 is a shaft such as a bolt, the slot 243 for positioning and supporting the magnet body 21 and a salient pole portion fixing hole provided in the salient pole portion 22 to penetrate the shaft body. 221 is provided with a salient pole fixing hole 241 at the same position as that of 221, a center part fixing hole 242 is provided at the center side of the salient pole part 22, and a rotating shaft hole 245 is provided at the center part. For example, the thickness is about 1.0 mm. The thickness of the intermediate plate 24 is also determined by the size of the rotor 2 and the rotational speed.

  In the intermediate plate 24, a portion indicated by 248 in FIG. 1E is a portion in which the air gap 236 is formed in the rotor steel plate 23. The salient pole portion 22 can be firmly supported against the centrifugal force applied to the pole portion 22 by the rotation of the rotor 2.

  The above is the configuration of the magnet-embedded rotor in the rotating electrical machine according to the present invention and the rotating electrical machine using the rotor. As can be seen from the above description, the rotor 2 for rotating electrical machine according to the present invention includes the magnet body 21. Since there is a foot portion of the support portion 234 at a distance from the side end, leakage magnetic flux from the side end of the magnet body 21 can be made very small while preventing the salient pole portion 22 and the magnet body 21 from being scattered due to centrifugal force. Thus, a decrease in efficiency can be prevented.

Although the number of salient pole portions 22 of the rotor 2 shown in FIG. 1 is shown as 6, this number is not limited to 6, and even if it is 8 poles, 10 poles or more, it is 6 poles or less. Of course, the same applies to the embodiments described below.
[Example 2]

FIG. 2 is a diagram for explaining a schematic configuration of a magnet-embedded rotor in Embodiment 2 of the rotating electrical machine according to the present invention. FIG. 2 (A) is a side view of the rotor 2 shown in FIG. 1 (F). Sectional drawing of the position shown by AA ', (B) is an enlarged view of the part which enclosed (circle) in this (A) and attached | subjected the code | symbol of b, (C) is the steel plate 23 for rotors laminated | stacked FIG. 4D is a plan view of a fixed plate provided at both ends of the rotor 2 in the rotation axis direction. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, but 22 ₁ is a salient pole portion, 23 ₁ is a steel plate for rotor, 24 ₁ is an intermediate plate, and 25 ₁ is a fixed plate. Reference numeral ₁ denotes a central portion, 235 ₁ , 245 ₁ , 255 ₁ denotes a rotation shaft hole, 234 ₁ denotes a support portion, and 236 ₁ denotes a gap. Note that unlike the first embodiment in this second embodiment, the intermediate plate 24 ₁ and the fixed plate 25 ₁ a structure without the refrigerant passage 27, so that the outer shape is substantially circular.

In Example 1 shown in FIG. 1, the support portion 234 that connects the salient pole portion 22 and the center portion 231 in the rotor steel plate 23 is formed with the approximate center between the adjacent salient pole portions 22 in the center portion 231 as a foot portion. It extends radially on the outer peripheral side, and is configured to be substantially Y-shaped or T-shaped to connect between the salient pole portions 22 and the central portion 21, and in the case of Y-shape, the refrigerant passage 27 is formed. It was. However, in Example 2 shown in FIG. 2, as shown in FIG. 2 (B), without providing the support portion corresponding to the support portion 234 at all, even the gap 236 ₁ side of the slot for accommodating the magnet 21 As the gap 233 ₁ , the salient pole part 22 ₁ and the central part 231 ₁ are separated. As with other portions of the embodiment 1, it is the same for the salient pole 22 ₁ is secured, such as by the salient pole portion fixing means 26 or welding or bonding. Note that this FIG. 2 (A), the has been shown peripheral line in the gap portion 236 ₁ of the second embodiment shown (B), the which is the outer periphery of the intermediate plate 24 _1.

In this way, by eliminating the support portion and making the air gap 236 ₁ side of the magnet body 21 also the air gap 233 ₁ , magnetic flux leakage from the air gap 236 ₁ side of the magnet body 21 is reduced. However, also eliminated support portion connecting the salient poles 22 ₁ to the rotor steel plate 23 ₁ itself magnet body 213, but the support portion 234 shown in FIG. 1, only the central portion 231 by the rotor steel plate 23 and the salient pole portion The salient pole part 22 ₁ and the magnet body 213 are supported by the intermediate plate 24 ₁ , the fixing plate 25 ₁ , the salient pole part fixing means 26 and the like so as not to be scattered firmly. Yes. Also, by a salient pole portion 22 ₁ and the center portion 231 ₁ and the separate, for example, a central axial thickness of the central portion 231 _1, and the intermediate plate 241 is interposed between the rotor steel plate 23 ₁ intermediate it is possible to configure a thickness between the plate 241, correspondingly, better assembly of the rotor, and it also possible to configure a center portion 231 ₁ and the salient pole portion 22 ₁ in a different material It becomes.
[Example 3]

FIG. 3 is a view for explaining a schematic configuration of a magnet-embedded rotor in Embodiment 3 of the rotating electrical machine according to the present invention, and FIG. 3 (A) is a side view of the rotor 2 shown in FIG. 1 (F). Sectional drawing of the position shown by AA ', (B) is an enlarged view of the part shown by enclosing (A) with (circle) and attaching | subjecting the code | symbol c, (C) is the steel plate 23 for rotors laminated | stacked FIG. 4D is a plan view of a fixed plate provided at both ends of the rotor 2 in the rotation axis direction. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, but 22 ₂ is a salient pole portion, 23 ₂ is a rotor steel plate, 24 ₂ is an intermediate plate, and 25 ₂ is a fixed plate. _{2 center,} 235 2, 255 ₂ rotation shaft hole, 236 ₂ void, 243 ₁ intermediate plate side slot for receiving the magnet body 21 provided on the inner periphery side of the intermediate plate 24 _2, 243 ₂ is the center portion side slot for receiving the magnet body 21 which is provided on the outer peripheral side of the central portion 231 _2. Even without providing the coolant passage 27 provided in Example 1 in the third embodiment, the intermediate plate 24 ₂ and the fixing plate 25 ₂ is as contour is circular.

In Example 2 shown in FIG. 2, without providing the support portion connecting the salient pole portion 22 and the central portion 231 of the rotor steel plate 23, as well as separately formed, and the salient pole portion in the intermediate plate 24 ₁ Although the portion corresponding to the central portion was integrated, in the third embodiment shown in FIG. 3, the intermediate plate 24 ₂ is arranged in a ring as shown in FIG. 3 (C), the inner periphery side of the intermediate plate 24 ₂ in the provided intermediate plate side slots 243 ₁ for accommodating the magnet body 21, on the outer peripheral side of the central portion 231 _1, the central portion side slots 231 ₁ for accommodating the magnet 21 is provided. Therefore, similarly to Example 2, nothing is present in the gap 236 ₂ side of the magnet 21, the magnetic flux leakage is reduced.

Therefore, similarly to the second embodiment shown in FIG. 2, or to form a salient pole portion 22 ₂ and the center portion 231 ₁ of different materials, the salient pole portion 22 ₂ is a laminated body made of a magnetic material, the central portion 231 ₁ can also be configured as an integral body, and the assembly of the rotor is improved accordingly. Other than that, the salient pole part 22 is fixed by the salient pole part fixing means 26 or by welding or bonding as in the case of the first and second embodiments. Note that this FIG. 3 (A), the although peripheral line is shown in the void portion 236 ₂ in the embodiment 3 shown (B), the which is the outer periphery of the intermediate plate 24 _2.
[Other embodiments]

FIGS. 4A, 4C, and 4D are diagrams for explaining a schematic configuration of another embodiment of the magnet-embedded rotor in the rotating electrical machine according to the present invention. 4 (A), 4 (C), and 4 (D) are cross-sectional views of the rotor steel plate 23 at the position indicated by AA ′ in the side view of the rotor 2 shown in FIG. 1 (F). , (B) is an enlarged view of a portion indicated by a circled circle in (A) with a symbol d. In the figure, the same components as those in FIG. 1 are given the same numbers, but 22 ₃ , 22 ₄ , and 22 ₅ are salient pole portions, 23 ₃ , 23 ₄ , and 23 ₅ are rotor steel plates, 235 ₃ , Reference numerals 235 ₄ and 235 ₅ denote rotation shaft holes, 236 ₃ and 236 ₅ denote gaps, 238 denotes a resin, and 239 denotes a non-magnetic sheet such as fiberglass.

First, FIG. 4A is similar to the first embodiment shown in FIG. 1, and as shown in an enlarged view in FIG. 4B, the salient pole part 22 ₃ and the central part 231 ₃ are connected to each other, and the central part 231 is connected. ₃ radially extend to the outer peripheral side of a substantially central between the salient pole portions 22 ₃ adjacent the foot of the supporting portion 234 ₃ to bind between salient pole 22 and the central portion 21 is formed in a T-shape Yes. The supporting portion 234 _3, if the previous period Example 1 and a similar example 0.5mm approximately, it is preferable that the fineness possible in forming the rotor steel plate 23 by press.

The supporting portion 234 ₃ is different from the case of FIG. 1 (C), the the outer peripheral side are not formed coolant passages 27. Therefore, the periphery of the rotor 2 is almost a circle as compared with the first embodiment shown in FIG. 1, but when the rotor 2 rotates, the frictional resistance and noise caused by the air gap 236 are reduced, and the rotating electric machine is correspondingly reduced. Efficiency can be increased.

Next FIG. 4 (C) FIG. 2 (A), or Figure 3 Example 2 shown (A), the same manner as in Example 3, instead of providing the support portion 234 into the gap 236 in the _4, but instead Is filled with resin 238. In this way, the outer periphery of the rotor 2 becomes almost a circle, and as in the embodiment shown in FIG. 4A, when the rotor 2 rotates, the frictional resistance and noise due to the air gap 236 are reduced, and accordingly the rotating electrical machine Efficiency can be increased.

FIG. 4D shows the entire circumference of the rotor 2 covered with a nonmagnetic sheet 239 such as glass fiber. In this way, the outer periphery of the rotor 2 becomes substantially circular, it is possible to prevent the resistance and noise caused by the rotation of the rotor 2 by a gap 236 _5, also, by making the air-tightness, the Patent Documents 3 and 4 It can also be a rotor in a rotating electrical machine that can be used in a gas or lubricating oil having a high chemical activity, or a mixture thereof.

  As described above, the magnet-embedded rotor in the rotating electric machine according to the present invention can be variously modified. However, basically, the intermediate plate 24 is interposed at appropriate intervals of the laminated body made of the magnetic material, and the salient pole portion fixing means. 26, even if a centrifugal force generated when rotating at high speed is applied to the salient pole portion 22 and the magnet body 21, the force is transmitted from the salient pole portion fixing means 26 to the intermediate plate 24 and the fixed plate 25. The intermediate plate 24 and the fixed plate 25 can be pressed firmly so that the salient pole portion 22 and the magnet body 21 do not scatter, thereby preventing the rotor 2 from being damaged. Therefore, since a special structure for supporting the salient pole part 22 is not required, there is no need to limit the size of the rotating electrical machine or the rotational speed of the rotor 2, and the degree of freedom in designing the rotor shape is increased. It becomes easy to prevent magnetic flux leakage.

  The magnet-embedded rotor in the rotating electrical machine according to the present invention can significantly reduce the leakage magnetic flux from the side end of the magnet body while preventing scattering of the salient pole part and magnet body constituting the rotor due to centrifugal force, thereby improving efficiency. can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the outline of a structure of the magnet embedding type | mold rotor in the rotary electric machine which becomes this invention, and the rotary electric machine using this rotor, (A) is a rotating shaft about the stator 1 and rotor 2 which comprise a motor or a generator. The figure seen from 3 directions, (B) is a top view of the steel plate 23 for rotors formed with the electromagnetic steel plate which comprises the rotor 2, (C) is an enlarged view of the part enclosed by (circle) of this (B), (D) is a plan view of a fixed plate provided at both ends of the rotor 2 in the rotation axis direction, (E) is a plan view of an intermediate plate interposed between laminated steel plates 23 for rotors, (F) is 4 is a side view of the rotor 2. FIG. It is a figure for demonstrating the structure outline of Example 2 of the magnet embedded rotor in the rotary electric machine which becomes this invention, (A) is shown by AA 'in the side view (F) of the rotor 2 in the said FIG. (B) is an enlarged view of the part indicated by circled (A) and indicated by the symbol b, (C) is interposed between the laminated steel plates 23 for the rotor. FIG. 4D is a plan view of a fixed plate provided at both ends of the rotor 2 in the rotation axis direction. It is a figure for demonstrating the structure outline of Example 3 of the magnet embedding type rotor in the rotary electric machine which becomes this invention, (A) is shown by AA 'in the side view (F) of the rotor 2 in the said FIG. (B) is an enlarged view of the portion indicated by c in this (A) and circled, and (C) is interposed between the laminated steel plates 23 for the rotor. FIG. 4D is a plan view of a fixed plate provided at both ends of the rotor 2 in the rotation axis direction. (A), (C), (D) is a figure for demonstrating the outline of a structure of the other Example of the magnet embedding type rotor in the rotary electric machine which becomes this invention, respectively, (B) is (A). It is the enlarged view of the part which attached | subjected and showed the code | symbol of d enclosed with (circle). It is an example of the rotor iron core which comprises the conventional rotor. It is another example of the core sheet which comprises the conventional rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Rotor rotating shaft 11 Teeth 12 Slot 21 Magnet body 22 Salient pole part 221 Salient pole part fixing hole 23 Rotor steel plate 231 Center part 232 Center part fixing hole 233 Magnet body slot 234 Support part 235 Rotating shaft Hole 236 Space 238 Resin 239 Non-magnetic sheet 24 Intermediate plate 241 Salient pole fixing hole 242 Center fixing hole 243 Magnet body slot 245 Rotating shaft hole 247 Center hole 248 Rigid portion 25 Fixing plate 251 Salient pole Part fixing hole 252 Center part fixing hole 255 Rotating shaft hole 258 Rigid portion 26 Bolt (saliency pole part fixing means)
27 Refrigerant passage

Claims (10)

Consists of a salient pole portion formed around a core portion formed of a laminate made of a magnetic body, and a magnet body embedded in a slot formed between the salient pole portion and the core portion. A magnet-embedded rotor having a gap between the salient pole parts,
An intermediate plate is interposed at appropriate intervals of the laminate made of the magnetic material, a fixed plate is provided at both ends of the rotor in the rotation axis direction, and the salient pole portion is fixed by the intermediate plate and the salient pole portion fixing means. A magnet-embedded rotor in a rotating electrical machine.   2. The magnet-embedded rotor in a rotating electrical machine according to claim 1, wherein the salient pole portion fixing means is a shaft body that passes through the salient pole portion and the intermediate plate and is fixed to the fixing plate.   2. The magnet-embedded rotor in the rotating electrical machine according to claim 1, wherein the salient pole part fixing means is welding or bonding in which the salient pole part, the intermediate plate, and the fixing plate are integrated.   The laminated body made of the magnetic body is provided with a support portion that extends radially from the gap portion in the core body portion and connects the salient pole portions, and the core body portion and the salient pole portion are integrally formed. The magnet-embedded rotor in the rotating electrical machine according to any one of claims 1 to 3.   The core body part and the salient pole part are configured separately, and a slot for embedding the magnet body is formed on the core body part side of the salient pole part and the salient pole part side of the core body part. A magnet-embedded rotor in a rotating electrical machine according to any one of claims 1 to 3.   6. The magnet-embedded rotor in a rotating electrical machine according to claim 1, wherein the intermediate plate is formed in a ring shape, and a slot for embedding the magnet body is formed on an inner periphery of the intermediate plate.   The magnet embedded rotor in a rotating electrical machine according to any one of claims 1 to 6, wherein a resin is filled in a gap between the adjacent salient pole portions.   The rotor embedded in a rotating electrical machine according to any one of claims 1 to 7, wherein the outer periphery of the rotor is covered with a nonmagnetic sheet.   9. The magnet-embedded rotor in a rotating electrical machine according to claim 1, wherein the magnet is a rare earth permanent magnet. A stator in which a winding is wound around a plurality of teeth arranged in the circumferential direction, and salient poles that are rotatably accommodated in the stator and are provided around a core body portion that is formed of a laminated body made of a magnetic material. A rotating electric machine comprising a portion and a magnet body embedded in a slot formed between the salient pole portion and the core portion, and having a gap between adjacent salient pole portions,
The rotor is provided with intermediate plates at appropriate intervals of the laminate made of the magnetic material, and fixed plates are provided at both ends of the rotor in the rotation axis direction so that the salient pole portions are fixed to the intermediate plates and salient pole portion fixing means. Rotating electric machine characterized by being fixed with.

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