Interior permanent magnet rotor
By designing magnet insertion holes, non-magnetic material insertion holes, and gap sections in the built-in permanent magnet rotor, combined with yokes and elastic components, the problems of magnetic flux leakage and loss were solved, thereby achieving an increase in rotational speed and a reduction in losses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ISUZU MOTORS LTD
- Filing Date
- 2025-12-30
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional built-in permanent magnet synchronous motors are prone to magnetic flux leakage when the rotor's bridge radial width is reduced, making it difficult for current to flow in the coils and increasing losses when the speed is increased.
The design employs multiple magnet insertion holes, non-magnetic material insertion holes, and gap sections. Combined with the first and second yokes and elastic components, the yoke formed by stacked fan-shaped magnetic materials moves on the rotor core, suppressing leakage flux and regulating the rotational speed.
While suppressing losses, the rotor speed is increased, copper losses are reduced, and efficient rotor operation is achieved.
Smart Images
Figure CN122437286A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a built-in permanent magnet rotor. Background Technology
[0002] The rotor of a conventional built-in permanent magnet synchronous motor is provided with a hole to prevent magnetic flux leakage. This hole is formed from one end of the magnet insertion hole in the circumferential direction to a bridge located in the rotor near its outer periphery, thereby preventing magnetic short circuits in the rotor (e.g., Japanese Unexamined Patent Application Publication No. 2014-87074). Summary of the Invention
[0003] The problem that the invention aims to solve
[0004] As the radial width of its bridge decreases, the rotor becomes less prone to internal flux leakage, allowing for a greater amount of flux to interconnect with the coils. However, this also makes it difficult to allow current to flow through the coils due to the induced voltage. To address this, weak-field control could be considered. However, increasing the rotor speed via weak-field control increases the amount of current that does not contribute to rotor rotation, leading to greater losses (copper losses).
[0005] This disclosure focuses on this point, and its purpose is to increase the rotor speed while suppressing losses.
[0006] Methods for solving problems
[0007] The built-in permanent magnet rotor according to this disclosure includes: a rotor core having: i) a plurality of magnet insertion holes formed at predetermined intervals in the circumferential direction, each of the plurality of magnet insertion holes having a magnet inserted therein; ii) a plurality of non-magnetic material insertion holes communicating with the inner end of each of the plurality of magnet insertion holes in the radial direction, and a non-magnetic material being inserted therein; and iii) a plurality of gap sections disposed between two adjacent non-magnetic material insertion holes and communicating with the two non-magnetic material insertion holes; a first yoke and a second yoke disposed within each of the plurality of gap sections so as to be movable along the inner wall surface of the gap section; and an elastic member disposed within each of the plurality of gap sections and pressing the first yoke and the second yoke inward in the radial direction of the rotor core.
[0008] The first and second yokes can be formed to extend in the axial direction of the rotor core by stacking sector magnetic materials and to be positioned facing each other in the circumferential direction of the rotor core.
[0009] The elastic member can be formed of a non-magnetic material and presses against one of the two flat surfaces of each of the first and second yokes that extend in the axial direction, located on the radially outer side of the rotor core.
[0010] One of the two non-magnetic materials inserted into the adjacent insertion holes can contact the outer peripheral surface of the first yoke along the axial direction, and the other non-magnetic material can contact the outer peripheral surface of the second yoke along the axial direction.
[0011] The gap section may include a thin plate member made of non-magnetic material on the inner wall surface, which contacts the first yoke or the second yoke when the elastic member contracts to its maximum size according to the rotation of the rotor core.
[0012] The magnet can be inserted into the magnet insertion hole, so that the radially outer end surface of the magnet is exposed from the outer peripheral surface of the rotor core, and a sealing member covering the outer peripheral surface of the rotor core can also be provided on the radially outer side of the rotor core.
[0013] The built-in permanent magnet rotor may also include a non-magnetic component formed of a non-magnetic material and disposed between the outer peripheral surface of the rotor core and the sealing component.
[0014] The thickness of the non-magnetic component in the radial direction can increase as the distance between the rotor core and the radial outer end surface of the magnet decreases in the circumferential direction.
[0015] The non-magnetic material insertion hole can be formed such that the circumference of the surface in contact with the magnet insertion hole is greater than the circumference of the magnet insertion hole.
[0016] The elastic member can be divided into multiple parts in the axial direction of the rotor core, and the spring characteristics of each of the divided elastic members can be determined according to the distance from the end plate disposed at the shaft end of the rotor core in the axial direction.
[0017] Invention Effects
[0018] According to this disclosure, the rotor speed can be increased while suppressing losses. Attached Figure Description
[0019] Figure 1 This is a diagram showing an overview of rotor 1.
[0020] Figure 2 This is a diagram showing the shape of the void section 13.
[0021] Figure 3 This is a diagram showing the configuration of the void section 13.
[0022] Figure 4 It is a cross-sectional view of rotor 1 taken along a plane in the axial direction of the rotation axis 2.
[0023] Figure 5 This is a diagram showing the configuration of the void section 13 in which the elastic member 15 is maximally compressed. Detailed Implementation
[0024] <Overview of Rotor 1>
[0025] Figure 1 This is a diagram showing an overview of rotor 1. Figure 1 This is a cross-sectional view of the rotor 1 taken along a plane orthogonal to the axial direction of the rotating shaft 2 of the built-in permanent magnet synchronous motor. The rotor 1 is disposed outside the rotating shaft 2 and inside the stator (not shown), and is a rotor having a plurality of magnets Z embedded therein. The rotor 1 includes a rotor core 10, and the rotor core 10 includes a plurality of magnet insertion holes 11, a plurality of non-magnetic material insertion holes 12, and a plurality of void sections 13. Figure 1 In the figure, only one of the multiple magnets Z, one of the multiple magnet insertion holes 11, one of the multiple non-magnetic material insertion holes 12, and one of the multiple gap segments 13 are indicated by reference numerals.
[0026] Rotor core 10 passes through the axial direction ( Figure 1 The rotor core 10 is formed by stacking annular magnetic material in the depth direction of the plane, and is configured to rotate in the rotational direction (circumferential direction) of the rotor shaft 2. Multiple magnet insertion holes 11 are formed at predetermined intervals in the circumferential direction, and magnets Z are inserted therein. Each magnet insertion hole 11 is formed as a rectangular shape extending in the axial direction in the radial direction of the rotor 1, and magnets Z having the same shape and size as the magnet insertion hole 11 are embedded in each magnet insertion hole 11. Each magnet Z is inserted into a corresponding magnet insertion hole 11 such that the radially outer end surface of the magnet Z is exposed from the outer circumferential surface of the rotor core 10.
[0027] A plurality of non-magnetic material insertion holes 12 communicate with the inner end of each of a plurality of magnet insertion holes 11 in the radial direction of the rotor core 10, and a non-magnetic material (magnetic flux barrier 14) is inserted therein. The non-magnetic material is, for example, a resin material, and is preferably a non-conductive material. Each non-magnetic material insertion hole 12 is formed such that the circumferential length of the surface in contact with the magnet insertion hole 11 is longer than the circumferential length of the magnet insertion hole 11. One of the two surfaces of each of the non-magnetic material insertion holes 12 along the radial direction of the rotor core 10 is formed to extend in the axial direction along a semi-circular arc, and the other surface is formed to communicate with the void section 13.
[0028] Multiple gap sections 13 are disposed between two adjacent non-magnetic material insertion holes 12 and are connected to the two non-magnetic material insertion holes 12. Figure 2 This is a diagram showing the shape of the void section 13. Figure 2 Is included Figure 1The diagram shows an enlarged view of the void section 13 and the non-magnetic material insertion hole 12 in part R of the rotor 1. Each void section 13 includes two first void sections F1 (F1a, F1b), a second void section F2, and a third void section F3. The two first void sections F1 (F1a, F1b) intersect along a line extending axially from the intersection point K. The cross-sectional shape of the first void sections F1, the second void section F2, and the third void section F3, respectively, cut by planes orthogonal to the axial direction of the rotation axis 2, is fan-shaped.
[0029] The first gap segment F1 is formed to extend in the axial direction, and its sector-shaped cross-section has a larger radius than the cross-sections of the second gap segment F2 and the third gap segment F3. The first gap segments F1a and F1b have the same shape and dimensions. The second gap segment F2 is formed to extend in the axial direction, and its sector-shaped cross-section has a radius smaller than the cross-section of the first gap segment F1 and larger than the cross-section of the third gap segment F3. The second gap segment F2 is located radially outside the intersection point K in the rotor core 10 to connect the two first gap segments F1. The third gap segment F3 is formed to extend in the axial direction, and its sector-shaped cross-section has a smaller radius than the cross-sections of the first gap segments F1 and the second gap segment F2. The third gap segment F3 is located radially inside the intersection point K in the rotor core 10 to connect the two first gap segments F1.
[0030] In each gap section 13, axially extending flat surfaces Sa1 and Sa2 of the first gap section F1a and axially extending flat surfaces Sb1 and Sb2 of the first gap section F1b are formed. In each gap section 13, flat surfaces Sa1 and Sb1 are positioned facing each other in the circumferential direction of the rotor core 10, and flat surfaces Sa2 and Sb2 are positioned facing each other in the circumferential direction of the rotor core 10. In each gap section 13, the central angle of the second gap section F2 in the circumferential direction is greater than the central angle of the third gap section F3 in the circumferential direction. In each gap section 13, the second gap section F2 and the third gap section F3 are positioned facing each other in the radial direction of the rotor core 10.
[0031] In each of the void sections 13, a magnetic flux barrier 14, into which a non-magnetic material is inserted, is formed to extend along the inner wall surface of the void section 13. In each void section 13, an elastic member 15 and two yokes 16 are inserted. The configuration of the void sections 13 will be described in detail below.
[0032] <Configuration of Gap Segment 13>
[0033] Figure 3This is a diagram showing the configuration of the void section 13. Figure 3 yes Figure 1 An enlarged view of the R portion of rotor 1 shown. Figure 3 The configuration of the gap section 13 is shown when the rotational speed of rotor 1 is equal to or lower than the base speed. The base speed is the maximum speed at which rotor 1 can rotate without weak field control, and is a fixed value, for example, between 3000 rpm and 5000 rpm. Figure 3 The magnetic flux M1 advancing from the radially outer side of rotor 1 (i.e., stator) toward magnet Za and the magnetic flux M2 advancing from magnet Za toward the radially outer side of rotor 1 are shown.
[0034] In the gap section 13, an elastic member 15, a first yoke 16a, and a second yoke 16b are inserted. In the gap section 13, the first yoke 16a, the elastic member 15, and the second yoke 16b are inserted in this order in the circumferential direction of the rotor core 10 from the side near the non-magnetic material insertion hole 12a.
[0035] The elastic member 15 is a spring made of a non-magnetic material, and is, for example, a return spring. As an example, the non-magnetic material is stainless steel. The elastic member 15 is disposed within each of the plurality of gap sections 13 and presses inwardly against the first yoke 16a and the second yoke 16b in the radial direction of the rotor core 10. Specifically, one end of the elastic member 15 presses against the first yoke 16a in a direction opposite to direction C1, and the other end of the elastic member 15 presses against the second yoke 16b in a direction opposite to direction C2.
[0036] The elastic member 15 presses, for example, one of the two flat surfaces extending in the axial direction of each of the first yoke 16a and the second yoke 16b, on the radially outer side of the rotor core 10. Specifically, one end of the elastic member 15 presses the flat surface L1a of the two flat surfaces L1a and L1b of the first yoke 16a, and the other end of the elastic member 15 presses the flat surface L2a of the two flat surfaces L2a and L2b of the second yoke 16b.
[0037] Due to the centrifugal force generated by the rotation of rotor 1 and acting on the first yoke 16a and the second yoke 16b, the elastic member 15 is pressed and contracted in directions C1 and C2. Therefore, the spring characteristics of the elastic member 15 (e.g., spring constant and set load) are determined such that the elastic member 15 contracts when the rotational speed of rotor 1 is equal to or higher than a predetermined rotational speed (e.g., base speed). By having an elastic member 15 configured in this way, the rotational speed at which the first yoke 16a and the second yoke 16b of rotor 1 begin to move can be adjusted by pressing the elastic member 15 with the first yoke 16a and the second yoke 16b.
[0038] The elastic member 15 can be divided into multiple parts in the axial direction of the rotor core 10. Figure 4 It is a cross-sectional view of rotor 1 taken along a plane in the axial direction of the rotation axis 2. Figure 4 yes Figure 1 The image shows a cross-sectional view (AA) of rotor 1. Figure 4 In the rotor 1 shown, end plates 30 (30a, 30b) are provided at both ends of the rotor core 10 in the axial direction. As an example, in Figure 4 In the middle, one of the two elastic members 15 is divided into elastic members 15a, 15b, 15c and 15d, and the other elastic member 15 is divided into elastic members 15e, 15f, 15g and 15h.
[0039] Each of the divided elastic members 15 (elastic members 15a, 15b, 15c, 15d and elastic members 15e, 15f, 15g, 15h) is positioned so as not to move in the axial direction. Specifically, a second yoke 16b extending in the circumferential direction is formed between elastic members 15a, 15b, 15c and 15d, such that elastic members 15a, 15b, 15c and 15d do not move in the axial direction. Similarly, a first yoke 16a extending in the circumferential direction is formed between elastic members 15e, 15f, 15g and 15h, such that elastic members 15e, 15f, 15g and 15h do not move in the axial direction.
[0040] The more the elastic member 15 is divided into multiple parts, the smaller the force required to press the first yoke 16a and the second yoke 16b. Therefore, by dividing the elastic member 15 into multiple elastic members 15 as described above, the number of divisions of the elastic member 15 can be determined in such a way that the elastic member 15 contracts at a predetermined speed of the rotor 1.
[0041] Furthermore, the spring characteristics of each elastic member 15 can be determined based on its distance from the end plate 30. That is, the spring characteristics of each divided elastic member 15 (elastic members 15a, 15b, 15c, 15d and elastic members 15e, 15f, 15g, 15h) are determined based on their distance from the end plate 30 disposed at the shaft end of the rotor core 10. For example, elastic members 15a and 15d can use elastic members with the same spring characteristics, and elastic members 15b and 15c can use elastic members with the same spring characteristics that may be different from those of elastic members 15a and 15d.
[0042] Back Figure 3 The first yoke 16a and the second yoke 16b are formed by stacking sector-shaped magnetic materials and extending in the axial direction of the rotor core 10, and are positioned to face each other in the circumferential direction of the rotor core 10. The magnetic material is the same as the magnetic material forming the rotor core 10, and is, for example, an electromagnetic steel plate. Figure 3 In the first yoke 16a shown, the flat surface L1b of the first yoke 16a, which is located on the radially inner side of the rotor core 10, is positioned as the flat surface Sa2 of the contact gap section 13. Figure 3 In the second yoke 16b shown, the flat surface L2b of the second yoke 16b, which is located on the radially inner side of the rotor core 10, is positioned as the flat surface Sb2 of the contact gap section 13.
[0043] Using this configuration, in Figure 3 The portion of the rotor core 10a and rotor core 10b shown where the magnetic flux is impeded is formed by the portion of the gap section 13 where the yoke 16 is not inserted and the magnetic flux barrier 14. As a result, when the rotational speed of the rotor 1 is less than the basic rotational speed, the magnetic flux advancing from the magnet Za to its radially inward side via the rotor core 10b can be suppressed (i.e., the generation of leakage flux can be suppressed).
[0044] The first yoke 16a and the second yoke 16b are disposed within each of the plurality of void sections 13 so as to be movable along the inner wall surface of the void section 13. Centrifugal force generated by the rotation of the rotor 1 acts on the first yoke 16a and the second yoke 16b, causing them to press against the elastic member 15. When the rotation of the rotor 1 reaches or exceeds the base speed, the first yoke 16a and the second yoke 16b press against the elastic member 15 with a force greater than the force by which the elastic member 15 presses against the first yoke 16a and the second yoke 16b, causing the elastic member 15 to contract and the yoke to move. In this case, the first yoke 16a moves in direction C1, and the second yoke 16b moves in direction C2.
[0045] Figure 5 This is a diagram showing the configuration of the void section 13 in which the elastic member 15 is maximally compressed. Figure 5 The diagram illustrates the first yoke 16a and the second yoke 16b during high-speed rotation of rotor 1 at a speed equal to or higher than the base speed (e.g., 15,000 rpm). The first yoke 16a moves to a position where its flat surface L1a contacts the flat surface Sa1 of the void section 13. The second yoke 16b moves to a position where its flat surface L2a contacts the flat surface Sb1 of the void section 13.
[0046] Because the first yoke 16a and the second yoke 16b move in such a manner, for example, in the first yoke 16a, the magnetic flux M3 advances from the magnet Za to the rotor core 10a via the rotor core 10b and the first yoke 16a. Therefore, the magnetic flux M3 can bypass the magnetic flux barrier 14 and point towards the surface of the magnet Za opposite to the surface that generates the magnetic flux M3. As a result, in the rotor 1, since the leakage magnetic flux increases during high-speed rotation at speeds equal to or higher than the base speed, the execution of weak-field control can be suppressed. Furthermore, by suppressing the execution of weak-field control, losses (copper losses) can be reduced.
[0047] The gap section 13 may include a thin plate member made of a non-magnetic material on its inner wall surface, which contacts either the first yoke 16a or the second yoke 16b when the elastic member 15 contracts to its maximum extent according to the rotation of the rotor core 10. The non-magnetic material is the same material as the magnetic flux barrier 14, and is, for example, a resin material. The thickness of the thin plate member is, for example, 1 mm. Figure 5 As shown, the gap section 13 has, for example, a thin plate member 17a on a flat surface Sa1 that contacts the first yoke 16a and a thin plate member 17b on a flat surface Sb1 that contacts the second yoke 16b. With this configuration, the magnetic flux advancing from the rotor core 10b towards the first yoke 16a and the second yoke 16b can be suppressed, thereby allowing the first yoke 16a and the second yoke 16b to move more easily as the rotational speed of the rotor 1 decreases.
[0048] It should be noted that one of the two magnetic flux barriers 14 (magnetic flux barrier 14a) inserted into two adjacent non-magnetic material insertion holes 12 contacts the outer peripheral surface R1a of the first yoke 16a along the axial direction. The other of the two magnetic flux barriers 14 (magnetic flux barrier 14b) inserted into two adjacent non-magnetic material insertion holes 12 contacts the outer peripheral surface R1b of the second yoke 16b along the axial direction. Furthermore, in the gap section 13, the magnetic flux barrier 14a is formed to extend along the inner wall surface of the outer peripheral surface R1a, and the magnetic flux barrier 14b is formed to extend along the inner wall surface of the outer peripheral surface R1b.
[0049] As described above, since the magnetic flux barrier 14 inserted into the non-magnetic material insertion hole 12 is formed to contact the outer peripheral surfaces R1a and R1b, during low-speed rotation when the rotor 1's rotational speed is less than the base speed, the rotor 1 impedes the magnetic flux moving radially inward toward the magnet Z. As a result, leakage magnetic flux from the magnet Z can be suppressed. Furthermore, during high-speed rotation when the rotor 1's rotational speed is equal to or higher than the base speed, the rotor 1 can cause the generated leakage magnetic flux to advance toward the surface of the magnet Z opposite to the surface where the leakage magnetic flux is generated.
[0050] The radially outer end surface R2 of magnet Z is inserted to expose the outer peripheral surface of rotor core 10a. Rotor core 10b is not connected to rotor core 10a. Therefore, when centrifugal force generated by the rotation of rotor 1 is applied, magnet Z, rotor core 10b, and elastic member 15 can move outward in the radial direction away from rotor 1. Therefore, rotor 1 can also include a sealing member 20 covering the outer peripheral surface of rotor core 10 on the radially outer side of rotor core 10. Sealing member 20 is formed, for example, from CFRP (carbon fiber reinforced plastic). By providing sealing member 20 in this way, magnet Z, rotor core 10b, and elastic member 15 can be prevented from moving away from rotor 1 due to centrifugal force.
[0051] The rotor 1 may further include a non-magnetic member 21 formed of a non-magnetic material between the outer peripheral surface of the rotor core 10 and the sealing member 20. For example, the non-magnetic member 21 may be formed using a resin material in the same manner as the magnetic flux barrier 14. The thickness of the non-magnetic member 21 in the radial direction may increase as the distance from the radially outer end surface R2 of the magnet Z in the circumferential direction of the rotor core 10 decreases. For example, Figure 5 The thickness T1 of the non-magnetic component 21 at position P1 in the diagram is greater than the thickness T2 of the non-magnetic component 21 at position P2 in the radial direction.
[0052] The magnetic flux advancing from magnet Z towards the stator tends to pass more easily through a location near the radially outer end surface R2 of magnet Z (i.e., the so-called magnetic pole center). Therefore, with a rotor 1 configured in this way, the thickness of the non-magnetic member 21 disposed between the rotor 1 and the stator increases near the magnetic pole center, causing the magnetic flux advancing from magnet Z towards the stator to tend to pass through the thinner portion of the non-magnetic member 21 (the portion farther from the end surface R2). As a result, the variation in the position of the magnetic flux advancing from rotor 1 towards the stator can be reduced.
[0053] Furthermore, since the radially outer end surface R2 of the magnet Z is exposed, the magnet Z presses against the sealing member 20 due to the centrifugal force acting on the rotor 1. Because the area of the end surface R2 is smaller than the area of the outer peripheral surface of the rotor core 10b, the magnet Z is more likely than the rotor core 10b to damage the sealing member 20 by pressing when the non-magnetic component 21 is absent. Therefore, by having a rotor 1 configured in this way, the thickness of the non-magnetic component 21 can be increased at locations where the sealing member 20 is more likely to be damaged, thereby making the sealing member 20 less susceptible to damage.
[0054] <Effect of Rotor 1>
[0055] As described above, the rotor 1 includes: a rotor core 10 having (i) a plurality of magnet insertion holes 11 formed at predetermined intervals in the circumferential direction and into which magnets Z are inserted; (ii) a plurality of non-magnetic material insertion holes 12 communicating with the inner end of each of the plurality of magnet insertion holes 11 in the radial direction and into which a magnetic flux barrier 14 is inserted; and (iii) a gap section 13 disposed between two adjacent non-magnetic material insertion holes 12 and communicating with the two non-magnetic material insertion holes 12; a first yoke 16a and a second yoke 16b disposed in each of the plurality of gap sections 13 so as to be movable along the inner wall surface of the gap section 13; and an elastic member 15 disposed in each of the plurality of gap sections 13 and pressing the first yoke 16a and the second yoke 16b inward in the radial direction of the rotor core 10.
[0056] By having a rotor 1 configured in this way, during low-speed rotation when the rotor 1 rotates at a speed less than the base speed, the magnetic flux (i.e., the generation of leakage flux) advancing radially inward from the magnet Z via the rotor core 10 can be suppressed. Furthermore, during high-speed rotation when the rotor 1 rotates at a speed equal to or higher than the base speed, the magnetic flux advances from the magnet Z to bypass the magnetic flux barrier 14 and points towards the surface of the magnet Z opposite in the circumferential direction to the surface that generates the magnetic flux, thereby increasing the amount of leakage flux. Therefore, since the rotor 1 can suppress the execution of electroweak field control, losses (copper losses) can be reduced.
[0057] This disclosure is explained based on exemplary embodiments. The technical scope of this disclosure is not limited to the scope described in the above embodiments, and various changes and modifications can be made within the scope of this disclosure. For example, all or part of the device may be configured with any units that are functionally or physically distributed or integrated. Furthermore, new exemplary embodiments resulting from any combination thereof are included in the exemplary embodiments. Moreover, the effects of new exemplary embodiments resulting from combinations also have the effects of the original exemplary embodiments.
[0058] [Symbol Description]
[0059] 1. Rotor
[0060] 2. Rotating shaft
[0061] 10 Rotor core
[0062] 10a rotor core
[0063] 10b rotor core
[0064] 11 Magnet insertion hole
[0065] 11a Magnet insertion hole
[0066] 11b Magnet insertion hole
[0067] 12 Non-magnetic material insertion holes
[0068] 12a Non-magnetic material insertion hole
[0069] 12b Non-magnetic material insertion hole
[0070] 13. Gap Section
[0071] 14. Magnetic Flux Barrier
[0072] 14a Magnetic Flux Barrier
[0073] 14b Magnetic Flux Barrier
[0074] 15. Elastic members
[0075] 15a Elastic Component
[0076] 15b Elastic member
[0077] 15c Elastic Component
[0078] 15d elastic member
[0079] 15e Elastic Component
[0080] 15f Elastic Member
[0081] 15g elastic component
[0082] 15h elastic member
[0083] 16 yoke
[0084] 16a First yoke
[0085] 16b Second yoke
[0086] 17a Thin plate components
[0087] 17b Thin plate components
[0088] 20 Sealing components
[0089] 21 Non-magnetic components
[0090] 30 end plate
[0091] 30a end plate
[0092] 30b end plate
Claims
1. A built-in permanent magnet rotor, comprising: The rotor core has: i) a plurality of magnet insertion holes formed at predetermined intervals in the circumferential direction, each of the plurality of magnet insertion holes having a magnet inserted therein; ii) A plurality of non-magnetic material insertion holes, which are radially connected to the inner end of each of the plurality of magnet insertion holes, and into which non-magnetic material is inserted; and iii) multiple gap sections, disposed between two adjacent non-magnetic material insertion holes and communicating with the two non-magnetic material insertion holes; A first yoke and a second yoke are disposed within each of the plurality of void segments so as to be movable along the inner wall surface of the void segment. as well as An elastic member is disposed within each of the plurality of gap sections and presses the first yoke and the second yoke inward in the radial direction of the rotor core.
2. The built-in permanent magnet rotor according to claim 1, wherein, The first yoke and the second yoke are formed to extend in the axial direction of the rotor core by stacking sector magnetic materials and are positioned to face each other in the circumferential direction of the rotor core.
3. The built-in permanent magnet rotor according to claim 2, wherein, The elastic member is formed of a non-magnetic material and presses against one of the two flat surfaces of the first yoke and the second yoke, which is located on the radially outer side of the rotor core.
4. The built-in permanent magnet rotor according to claim 3, wherein, One of the two non-magnetic materials inserted into the two adjacent non-magnetic material insertion holes contacts the outer peripheral surface of the first yoke along the axial direction, and the other non-magnetic material contacts the outer peripheral surface of the second yoke along the axial direction.
5. The built-in permanent magnet rotor according to claim 1, wherein, The gap section includes a thin plate member made of non-magnetic material on the inner wall surface, which contacts the first yoke or the second yoke when the elastic member contracts to its maximum size according to the rotation of the rotor core.
6. The built-in permanent magnet rotor according to claim 1, wherein, The magnet is inserted into the magnet insertion hole such that the radially outer end surface of the magnet is exposed from the outer peripheral surface of the rotor core. A sealing member covering the outer peripheral surface of the rotor core is also provided on the radially outer side of the rotor core.
7. The built-in permanent magnet rotor according to claim 6 further includes: A non-magnetic component, formed of a non-magnetic material, is disposed between the outer peripheral surface of the rotor core and the sealing component.
8. The built-in permanent magnet rotor according to claim 7, wherein, The thickness of the non-magnetic component in the radial direction increases as the distance between the rotor core and the radial outer end surface of the magnet in the circumferential direction decreases.
9. The built-in permanent magnet rotor according to claim 1, wherein, The non-magnetic material insertion hole is formed such that the circumference of the surface in contact with the magnet insertion hole is greater than the circumference of the magnet insertion hole.
10. The built-in permanent magnet rotor according to claim 1, wherein, The elastic member is divided into multiple parts in the axial direction of the rotor core, and the spring characteristics of each of the divided elastic members are determined according to the distance from the end plate disposed at the shaft end of the rotor core in the axial direction.