WO2019077868A1 - 回転電機及びこれを備えた電動機車両 - Google Patents

回転電機及びこれを備えた電動機車両 Download PDF

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Publication number
WO2019077868A1
WO2019077868A1 PCT/JP2018/031006 JP2018031006W WO2019077868A1 WO 2019077868 A1 WO2019077868 A1 WO 2019077868A1 JP 2018031006 W JP2018031006 W JP 2018031006W WO 2019077868 A1 WO2019077868 A1 WO 2019077868A1
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WIPO (PCT)
Prior art keywords
bridge
core region
core
rotor
magnetic pole
Prior art date
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Ceased
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PCT/JP2018/031006
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English (en)
French (fr)
Japanese (ja)
Inventor
伊藤　誠
暁史 高橋
愼治 杉本
周一 民谷
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Hitachi Ltd
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Hitachi Ltd
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Priority to EP18867850.2A priority Critical patent/EP3700062A4/en
Publication of WO2019077868A1 publication Critical patent/WO2019077868A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to a rotating electrical machine and a motor vehicle equipped with the same.
  • a rotating electric machine using a permanent magnet reduces the current flowing through the coil by utilizing the residual magnetic flux of the permanent magnet for torque generation, thereby enabling downsizing and high efficiency.
  • a magnetic flux passing through the permanent magnet has a so-called armature linkage flux linked to the coil, and the armature linkage flux contributes to torque generation.
  • some of the magnetic flux passing through the permanent magnet has a leakage flux not linked to the coil, and the leakage flux does not contribute to the torque generation. Therefore, in order to miniaturize the rotating electrical machine and increase its efficiency, it is necessary to reduce the leakage magnetic flux and to have a structure for effectively utilizing the residual magnetic flux of the permanent magnet.
  • the centrifugal force accompanying the rotation of the rotor acts on the permanent magnet, and a configuration for mechanically supporting the centrifugal load by the permanent magnet is required of the rotor.
  • a bridge for mechanically supporting the centrifugal load of the permanent magnets is required.
  • the bridge is generally configured integrally with the rotor core, so that the magnetic flux can easily pass.
  • a part of magnetic flux passing through the permanent magnet is a leakage flux shorting only the permanent magnet and the bridge. Leakage flux through the bridge is generated until the relative permeability of the bridge approaches 1 and the bridge is magnetically saturated. Therefore, in order to reduce the leakage flux passing through the bridge, it is necessary to narrow the width of the bridge to facilitate magnetic saturation. However, in this case, there is a problem that it is difficult to obtain sufficient strength for mechanical support.
  • a flux barrier may be provided to increase the difference between d-axis inductance and q-axis inductance.
  • a bridge for mechanically supporting a centrifugal load is required.
  • the torque of the motor decreases.
  • it is necessary to increase the current and there is a problem that it is difficult to miniaturize the rotating electrical machine and to achieve high efficiency.
  • Patent Document 1 As a structure for reducing the leakage flux from the bridge of the rotor, for example, as shown in Patent Document 1, there is a technology for reducing the leakage flux by configuring a part of the bridge as a leakage path of the magnetic flux with a nonmagnetic material. It is disclosed.
  • the angle between the magnetic pole center line and the straight line passing through the connecting direction of the bridge is more than the angle between the magnetic pole central line and the straight line connecting the rotational axis of the rotor to the bridge.
  • Patent Document 3 discloses a technique of lengthening a flux path from a permanent magnet passing through a bridge to reduce a leakage flux by lengthening a bridge.
  • Patent Document 4 as a technique for improving the strength of the bridge, the bridge is extended in the normal direction with respect to the outer peripheral surface of the magnet slot in order to suppress the deformation of the rotor core accompanying the injection molding of the bond magnet. Technology is disclosed.
  • an object of the present invention is to provide a rotating electrical machine capable of reducing a bridge width and reducing a leakage flux from a bridge in consideration of a deformation mode around the bridge due to the elasticity of a rotor core.
  • the feature of the present invention is a rotating electrical machine including a stator, a rotor including a rotor core formed of magnetic material, and a shaft fixed to the rotor.
  • the rotor core is provided with at least one hole in the circumferential direction per magnetic pole, and a core region A disposed on the inner peripheral side with respect to the hole, and an outer peripheral side with respect to the hole
  • the core region B and the core region B are mechanically connected by at least two bridges of the first bridge and the second bridge circumferentially separated from the center of the magnetic pole
  • the distance between the connection between the first bridge and the core region A of the second bridge is L1
  • the distance between the connection between the first bridge and the core region B of the second bridge is L2 And L2 ⁇
  • the angle 1 between the first bridge and the inner circumferential surface of the core region B on the magnetic pole center side is ⁇ 1, and the second bridge and the inner circumferential surface of the core region B are satisfied.
  • a feature of the present invention is a rotating electrical machine including a stator, a rotor including a rotor core formed of a magnetic material, and a shaft fixed to the rotor.
  • the magnetic pole is provided with at least one magnet insertion hole per magnetic pole in the circumferential direction, and a core region A arranged on the inner peripheral side with respect to the magnet insertion hole, and arranged on the outer peripheral side with respect to the magnet insertion hole A core region B is provided, a permanent magnet is inserted into the magnet insertion hole, and the core region A and the core region B are a first bridge and a second bridge circumferentially separated from a magnetic pole center
  • the distance between the connection of the first bridge and the core area A of the second bridge is L1 and the core area of the first bridge and the second bridge is mechanically connected by at least two bridges.
  • FIG. 1 is a cross-sectional view in a plane parallel to the rotation axis of the rotary electric machine according to the first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view in a plane perpendicular to the rotation axis of the rotor according to the first embodiment of the present invention.
  • the rotary electric machine 1 includes a stator 10, a rotor 20 rotatably supported radially inward of the stator 10, a shaft 90 fixed to the rotor 20, the stator 10 and the rotor It is comprised from the flame
  • the rotor 20 is rotatably supported by the stator 10 via a gap 100.
  • the stator 10 is provided with a stator winding 11 wound in a stator slot.
  • the rotor 20 rotates around the rotation axis X.
  • the words “inner side” and “outer side” define the side closer to the rotational axis X as “inner side” and the far side as “outer side”.
  • the “radial direction” is defined as a linear direction perpendicular to the rotational axis X
  • the “circumferential direction” is defined as a rotational direction around the rotational axis X.
  • the rotor 20 is composed of a rotor core 30 which is a magnetic body, and a shaft 90 which passes through the rotor core 30 and which is a rotation shaft of the rotor 20. Further, the rotor 20 has an even number (eight in FIG. 2) of magnetic poles. Each pole has at least one air hole 40.
  • the rotor core 30 has a core region A disposed on the inner circumferential side with respect to the air holes 40 and a core region B disposed on the outer circumferential side with respect to the air holes 40.
  • the core region A and the core region B of each magnetic pole are mechanically connected by at least two bridges of the first bridge 51 and the second bridge 52 circumferentially separated from the magnetic pole center C with the magnetic pole center C interposed therebetween. There is.
  • the air holes 40 are formed by the first bridge 51, the second bridge 52, the core region A and the core region B.
  • the rotor core 30 As a material of the rotor core 30, it is desirable to use a laminated steel sheet laminated with an electrical insulator in order to reduce the eddy current loss generated in the rotor core 30, but material cost and processing cost can be reduced. A solid magnetic material may be used to reduce this.
  • the rotor core 30 is fixed to the shaft 90 using a method such as bonding, welding, press fitting, or shrink fitting. When the rotor core 30 is made of solid magnetic material, the rotor core 30 and the shaft 90 may be integrally molded. Further, although the cross-sectional shape of the holes 40 is substantially trapezoidal in FIG. 2, the shape may be, for example, a substantially triangular shape or a substantially arc shape, as long as the holes divide the core region A and the core region B.
  • FIG. 3 is a partial sectional view in a plane perpendicular to the rotation axis of the rotor according to the first embodiment of the present invention.
  • the first bridge 51 and the second bridge 52 are separated by sandwiching the magnetic pole center C (FIG. 2), and the distance between the connecting portions 102 between the first bridge 51 and the core region A of the second bridge 52 is L1. Assuming that the distance between the connection portions 101 between the first bridge 51 and the core region B of the second bridge 52 is L2, the distance L2 is shorter than the distance L1 in the structure of this embodiment. That is, the relational expression L2 ⁇ L1 holds.
  • an angle formed on the magnetic pole center C side between the first bridge 51 and the boundary surface between the air holes 40 on the inner peripheral side of the core region B (hereinafter referred to as the inner peripheral surface) is ⁇ 1.
  • the angles ⁇ 1 and ⁇ 2 are obtuse angles. That is, the relational expressions ⁇ 1> 90 ° and ⁇ 2> 90 ° hold.
  • the core region A has a substantially regular octagonal shape, but may have, for example, a circular shape or a substantially gear shape as shown in FIGS. 4 and 5 as long as the above relationship is satisfied.
  • the details of FIGS. 4 and 5 will be described later.
  • one of the inner peripheral side and the outer peripheral side of the circumferential end of core region B may be long, and the distance L 3 is the inner peripheral side of the peripheral end of core region B Alternatively, it is defined as the distance connecting between the longer end portions on the outer peripheral side.
  • the first bridge 51 and the second bridge 52 have a substantially rectangular shape with a constant radial width, but may have, for example, an arc shape or a shape with a non-uniform radial width.
  • the core region B When the core region B receives a centrifugal force, the core region B tries to move away from the rotational axis X, but at the same time, the connection portion 101 between the first bridge 51 and the second bridge 52 becomes the first bridge 51 and the second bridge 52. Receive tension in the inward direction by For this reason, in the core region B, the connection portion 101 is closer to the inner diameter side, and the core region B between the first bridge 51 and the connection portion 101 of the second bridge 52 is deformed in an arc shape. Due to the deformation of the core region B, tensile force, shear force and bending moment act on the first bridge 51 and the second bridge 52. The force acting on the first bridge 51 and the second bridge 52 and the bending moment are shown in FIG.
  • FIG. 6 is a partial sectional view in a plane perpendicular to the rotation axis of the rotor 20 according to the first embodiment of the present invention.
  • the force and the moment acting on the first bridge 51 are drawn as the fulcrum of the connection portion 101 in the partial cross-sectional view.
  • a force F1 due to the centrifugal action of the core region B acts on the first bridge 51 and the second bridge 52.
  • the force F1 is a force that is generated even if the core region B is a rigid body, and is parallel to the pole center C at each magnetic pole.
  • the force F1 is a tensile force with respect to the first bridge 51 and the second bridge 52, respectively. It can be decomposed into T1 component and shear force Q component.
  • a force F2 that reduces the distance L2 acts on the first bridge 51 and the second bridge 52 along with the bow-shaped deformation of the core region B. Similar to force F1, force F2 can be broken down into a tensile T2 component and a shear P component. In addition, since the core region B deforms in an arc while bending around the connection portion 101, a bending moment M acts on the first bridge 51 and the second bridge 52.
  • a counterclockwise bending moment M acts on the connection portion 101 of the first bridge 51 located to the left of the pole center C, and the connection portion 101 of the second bridge 52 located to the right of the pole center C.
  • a clockwise bending moment M acts on the. Therefore, tensile forces T1 and T2, shear forces P and Q, and bending moment M act on the first bridge 51 and the second bridge 52, respectively.
  • the stress generated in the first bridge 51 and the second bridge 52 will be described.
  • the core area A is located on the inner peripheral side of the rotor 20 and has a structure integrally connected by each pole, so the amount of deformation is smaller than that of the core area B.
  • the first bridge 51 and the second bridge 52 can be regarded as cantilevers in which the connecting portion 102 with the core region A is a fixed end and the connecting portion 101 with the core region B is a free end.
  • FIG. 7 is a view showing a cantilever model for calculating the stress generated in the first bridge 51 and the second bridge 52.
  • the length from the connection 101 to the connection 102 of the first bridge 51 or the second bridge 52 that is, the length of the beam is defined as L, and various forces and bending acting on the first bridge 51 or the second bridge 52 .
  • a bending moment of size M is generated in the connection portion 101
  • a bending moment of-(PQ) L + M is generated in the connection portion 102
  • the bending stress distribution is from the connection portion 101 to the connection portion 102. It changes linearly.
  • a tensile force T1 + T2 is generated over the entire area of the beam. Therefore, on the connection portion 101 side of the first bridge 51 and the second bridge 52, a local stress ⁇ 1 represented by Formula 1 is generated.
  • ⁇ 1 M / Z + (T1 + T2) / S (Equation 1)
  • Z is a cross section coefficient of the first bridge 51 and the second bridge 52
  • S is a cross sectional area of the first bridge 51 and the second bridge 52.
  • FIG. 8 shows a cross-sectional view in a plane perpendicular to the rotation axis of the rotor according to the comparative example.
  • the tension components of the force F1 and the force F2 and the first bridge 51 and the second bridge 52 satisfy L2 ⁇ L1 and ⁇ 1> 90 ° and ⁇ 2> 90 °.
  • the proportion of shear component can be varied.
  • the tensile force T1 and the shear force P become smaller, and the tensile force T2 and the shear force Q become larger.
  • the core region B is present on both sides in the circumferential direction of the connection portion 101.
  • a centrifugal force acts on each of the core 35 on the circumferential magnetic pole center C side of the connection portion 101 and the core 36 on the circumferential direction q axis side, and the rotational directions of bending moment generated in the connection portion 101 by the respective cores become opposite. Therefore, when L2 ⁇ L3, the bending moment M decreases.
  • FIG. 9 is a view showing changes in force and bending moment acting on the rotor according to the first embodiment of the present invention.
  • L2 ⁇ L1 and ⁇ 1> 90 ° and ⁇ 2> 90 ° the term of (P ⁇ Q) L of Expression 2 becomes small, so local stress on the connection portion 102 side can be reduced.
  • L2 ⁇ L3 the bending moment M and the tensile force T2 become small, so the value of the equation 1 becomes small, and the local stress on the connection portion 101 side can be reduced.
  • the efficiency can be increased by current reduction as compared with the conventional structure which produces the same motor torque.
  • the motor torque increases due to the increase in reluctance torque due to the reduction of the d-axis inductance, and the motor torque can be reduced with the same motor torque.
  • this embodiment does not guarantee that the equation 3 is always established, but by applying the structure of this embodiment, the bending moment M, the shear force P and the shear force Q are balanced, and the equation 3 It is characterized in that the values of the left side and the right side can be made close to each other.
  • FIG. 10 is a view showing a stress analysis result per magnetic pole comparing stress distribution with centrifugal load in the structures of the comparative example and the present embodiment.
  • the rotor core 30 uses the same material physical properties, and the first bridge 51 and the second bridge 52 have equal width in the lateral direction, and the core region
  • the shapes of A and core region B were the same, and the stress distribution in the case of rotating at the same rotation speed was compared.
  • the distance between the connection portions 102 between the first bridge 51 and the core region A of the second bridge 52 is L1
  • the core region B of the first bridge 51 and the second bridge 52 When the distance between the connection portions 101 is L2, the relationship of L2 ⁇ L1 is satisfied, and an angle formed by the first bridge 51 and the inner circumferential surface of the core region B on the magnetic pole center C side is ⁇ 1. Assuming that an angle formed by the two bridges 52 and the inner circumferential surface of the core region B is ⁇ 2, the relationship ⁇ 1> 90 ° and ⁇ 2> 90 ° is satisfied, and a distance connecting circumferential end portions of the core region B is L3. And the relationship of L2 ⁇ L3 is satisfied.
  • the core area A has a substantially regular octagonal shape, but may have a circular shape or another polygonal shape as long as the relationship of the expressions 1 to 3 is satisfied.
  • FIGS. 4 and 5 are cross-sectional views in a plane perpendicular to the rotation axis of a rotor according to a second embodiment of the present invention. Descriptions of matters overlapping with the first embodiment will be omitted.
  • a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided between the core regions B adjacent to each other provided core region B.
  • the q-axis core 32 located at the outermost periphery of the core region A passes magnetic flux, the q-axis inductance becomes large, and reluctance torque can be utilized.
  • the width of the q-axis core 32 becomes narrow, and the reluctance torque can not be sufficiently utilized.
  • the radial width of the first bridge 51 and the second bridge 52 can be narrowed, the width of the q-axis core 32 can be widened. Furthermore, as a leakage flux reduction effect of the first bridge 51 and the second bridge 52, the d-axis inductance is reduced. Therefore, in the present embodiment, the reluctance torque can be increased and the motor torque can be increased.
  • the core region B and the holes 40 may be configured to overlap in the radial direction.
  • a plurality of holes 40 a and 40 b are formed on the radially outer peripheral side of the core region A so as to overlap in the radial direction.
  • a plurality of core regions B1 and B2 are formed on the radially outer peripheral side of the holes 40a and 40b so as to overlap in the radial direction.
  • a plurality of q-axis cores 32 projecting to the outer peripheral side in the radial direction are provided between the core regions B adjacent to each other of the plurality of provided core regions B.
  • first bridge 51 (51a, 51b) and the second bridge 52 (52a, 52b) are arranged in multiple stages in the radial direction.
  • connection portions 101 (101a, 101b) and the connection portions 102 (102a, 102b) are also formed in multiple stages.
  • the first bridge 51b and the second bridge 52b are separated by sandwiching the pole center C, and the distance between the connecting portion 102b of the first bridge 51b and the core region B1 of the second bridge 52b is L1.
  • the structure of this embodiment is such that the distance L2 is shorter than the distance L1. That is, the relational expression L2 ⁇ L1 holds.
  • an angle formed on the magnetic pole center C side between the first bridge 51b and the boundary surface between the air holes 40b on the inner peripheral side of the core region B2 (hereinafter referred to as the inner peripheral surface) is ⁇ 1.
  • the angles ⁇ 1 and ⁇ 2 are obtuse angles. That is, the relational expressions ⁇ 1> 90 ° and ⁇ 2> 90 ° hold.
  • the definitions of the distances L1, L2 and L3 and the angles ⁇ 1 and ⁇ 2 are not limited to the above definitions, and the first bridge 51a and the core region A of the second bridge 52a separated with the magnetic pole center C therebetween
  • the distance between the connection portions 102a is L1
  • the distance between the connection portions 101a of the first bridge 51a and the core region B1 of the second bridge 52a is L2
  • the distance connecting the circumferential end portions of the core region B1 is L3.
  • the angle between the magnetic pole center C side and the boundary surface between the first bridge 51a and the hole 40a on the inner peripheral side of the core region B1 (hereinafter referred to as the inner peripheral surface) is ⁇ 1, and the second bridge The angle between the magnetic pole center C and the inner peripheral surface 52a of the core region B1 may be ⁇ 2.
  • any one of the inner peripheral side and the outer peripheral side of the circumferential end of the core region B1 may be long, and the distance L3 is the inner peripheral side or outer periphery of the circumferential end of the core region B1 It is defined as the distance connecting the longer ends of the sides.
  • the relational expressions L2 ⁇ L1, ⁇ 1> 90 °, ⁇ 2> 90 °, L2 ⁇ L3 hold for the distances L1, L2, L3 and the angles ⁇ 1, ⁇ 2 defined here.
  • the distances L1, L2, L3 and the angles ⁇ 1, ⁇ 2 can be defined. If the relational expressions L2 ⁇ L1, ⁇ 1> 90 °, ⁇ 2> 90 °, L2 ⁇ L3 hold in at least one core region B and the holes 40, the effect of this embodiment can be obtained.
  • the structure in which the first bridge 51 and the second bridge 52 are arranged in multiple stages in the radial direction as shown in FIG. 5 is generally used as a synchronous reluctance motor.
  • reluctance torque is used by increasing the difference between d-axis reluctance and q-axis reluctance by forming cores in multiple stages, but by increasing the number of cores, the number of bridges increases, or The circumferential width of the As a result, the difference between the d-axis reluctance and the q-axis reluctance can not be made sufficiently large.
  • the circumferential width of the first bridge 51 and the second bridge 52 can be narrowed, the difference between the d-axis reluctance and the q-axis reluctance can be increased. It can be used. This makes it possible to increase the torque, increase the efficiency, and reduce the size of the motor.
  • FIG. 11 and FIG. 11 and 12 are cross-sectional views in a plane perpendicular to the rotation axis of a rotor according to a third embodiment of the present invention. Descriptions of matters overlapping with the first embodiment and the second embodiment will be omitted.
  • At least one magnet insertion hole 45 is formed in each magnetic pole.
  • a permanent magnet 70 for forming a magnetic pole is accommodated.
  • the rotor core 30 has a core region A disposed on the inner circumferential side with respect to the magnet insertion hole 45 and a core region B disposed on the outer circumferential side with respect to the magnet insertion hole 45.
  • the core region A and the core region B of each magnetic pole are mechanically connected by at least two bridges of the first bridge 51 and the second bridge 52 circumferentially separated from the magnetic pole center C with the magnetic pole center C interposed therebetween. There is.
  • the material of the permanent magnet 70 is not limited, and any material such as ferrite, neodymium, samarium cobalt, etc. may be used. Moreover, although the rectangular-shaped permanent magnet is used in a present Example, you may be an arc-shaped permanent magnet. Furthermore, a bonded magnet may be injection molded in the magnet insertion hole 45. Alternatively, the permanent magnet 70 may be divided and stacked in the rotation axis direction.
  • Each magnetic pole is composed of one permanent magnet 70.
  • the q-axis core 32 may be provided in a portion located on the outermost periphery of the core region A through which the q-axis passes. Since the q-axis core 32 passes a magnetic flux, the q-axis inductance is increased, and reluctance torque can be utilized.
  • the relational expressions L2 ⁇ L1 and L2 ⁇ L3 hold, as in the first and second embodiments.
  • the angle between the magnetic pole center C side and the boundary surface between the first bridge 51 and the magnet insertion hole 45 on the inner peripheral side of the core region B (hereinafter referred to as the inner peripheral surface) is ⁇ 1.
  • the angles ⁇ 1 and ⁇ 2 are obtuse angles. That is, the relational expressions ⁇ 1> 90 ° and ⁇ 2> 90 ° hold.
  • one of the inner peripheral side and the outer peripheral side of the circumferential end of core region B may be formed longer, and the distance L 3 is the inside of the peripheral end of core region B It is defined as the distance connecting the longer end of the circumferential side or the outer circumferential side.
  • the first bridge 51 and the second bridge 52 have a substantially rectangular shape with a constant radial width, but may have, for example, an arc shape, or a shape with a non-uniform radial width.
  • centrifugal force acts not only on the rotor core 30 but also on each portion of the permanent magnet 70.
  • the permanent magnet 70 applies a load to the core region B in an attempt to separate the core region B from the core region A.
  • the centrifugal action of the permanent magnet 70 can be regarded as an increase in the centrifugal force of the core region B, and basically the same stress distribution as that of the first embodiment is obtained.
  • the first bridge 51 and the second bridge 51 can be reduced by reducing the equations 1 and 2 and balancing the bending moment M, the shear force P and the shear force Q so as to approach the equation 3.
  • the bending stress acting on the two bridges 52 can be reduced.
  • the radial width of the first bridge 51 and the second bridge 52 can be narrowed, and the leakage flux from the first bridge 51 and the second bridge 52 can be reduced.
  • the leakage magnetic flux from the first bridge 51 and the second bridge 52 can be reduced, cost reduction by reducing the amount of permanent magnet and high efficiency by reducing the current can be achieved as compared with the conventional structure producing the same motor torque. it can.
  • the motor torque increases due to an increase in magnet torque due to an increase in armature linkage flux of permanent magnet 70 and an increase in reluctance torque due to d axis inductance reduction. If the motor torque is the same, downsizing of the rotating electrical machine is possible.
  • the increase in the armature linkage flux of the permanent magnet 70 improves the induced electromotive force and improves the power factor.
  • the amount of permanent magnet can be reduced or the cost can be reduced accordingly.
  • the magnet torque is reduced, so that the efficiency decreases due to the decrease in motor torque or the increase in current.
  • the leakage flux from the first bridge 51 and the second bridge 52 can be reduced, the armature linkage flux can be increased compared to the conventional structure even if the amount of permanent magnet is reduced. be able to. Therefore, it is possible to improve the efficiency by increasing the motor torque due to the increase of the magnet torque or reducing the current.
  • the core region B is magnetically saturated in a wide range, which may lower the q-axis inductance.
  • the permanent magnet 70 since the permanent magnet 70 is not embedded deep to the inner peripheral side of the core region A, a path of magnetic flux passing through the core region A is easily formed , Q-axis inductance can be increased. Therefore, even if the core region B is magnetically saturated in a wide range, the reluctance torque does not decrease.
  • FIG. 13 is a cross-sectional view of a rotor according to a fourth embodiment of the present invention in a plane perpendicular to the rotation axis of the rotor. Descriptions of matters overlapping with the first to third embodiments will be omitted.
  • the core region B and the magnet insertion hole 45 are configured to overlap in the radial direction. Further, on the radially outer peripheral side of the core region A, a plurality of magnet insertion holes 45a and 45b are formed so as to overlap in the radial direction. Further, a plurality of core regions B1 and B2 are formed on the radially outer peripheral side of the magnet insertion holes 45a and 45b so as to overlap in the radial direction. Permanent magnets 70a and 70b are inserted into the magnet insertion holes 45a and 45b. In the present embodiment, the magnetic pole is constituted by a plurality of permanent magnets 70a and 70b. Furthermore, between the core regions B adjacent to each other provided core region B, a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided.
  • first bridge 51 (51a, 51b) and the second bridge 52 (52a, 52b) are arranged in multiple stages in the radial direction.
  • connection portions 101 (101a, 101b) and the connection portions 102 (102a, 102b) are also formed in multiple stages.
  • the first bridge 51b and the second bridge 52b are separated by sandwiching the magnetic pole center C, and the distance between the connecting portion 102b of the first bridge 51b and the core region B1 of the second bridge 52b is Assuming that the distance between the connection portion 101b between the first bridge 51b and the core region B2 of the second bridge 52b is L2, the distance L2 is shorter than the distance L1 in the structure of this embodiment. That is, the relational expression L2 ⁇ L1 holds.
  • an angle formed on the magnetic pole center C side between the first bridge 51b and the boundary surface between the magnet insertion hole 45b on the inner peripheral side of the core region B2 (hereinafter referred to as the inner peripheral surface) is ⁇ 1.
  • the angles ⁇ 1 and ⁇ 2 are obtuse angles. That is, the relational expressions ⁇ 1> 90 ° and ⁇ 2> 90 ° hold.
  • the definitions of the distances L1, L2 and L3 and the angles ⁇ 1 and ⁇ 2 are not limited to the above definitions, and the first bridge 51a and the core region A of the second bridge 52a separated with the magnetic pole center C therebetween
  • the distance between the connection portions 102a is L1
  • the distance between the connection portions 101a of the first bridge 51a and the core region B1 of the second bridge 52a is L2
  • the distance connecting the circumferential end portions of the core region B1 is L3.
  • an angle between the magnetic pole center C and the boundary between the first bridge 51a and the magnet insertion hole 45a on the inner peripheral side of the core region B1 (hereinafter referred to as the inner peripheral surface) is ⁇ 1, and the second The angle between the bridge 52a and the inner circumferential surface of the core region B1 on the magnetic pole center C side may be ⁇ 2.
  • the shape of the core region B1 any one of the inner peripheral side and the outer peripheral side of the circumferential end of the core region B1 may be long, and the distance L3 is the inner peripheral side or outer periphery of the circumferential end of the core region B1 It is defined as the distance connecting the longer ends of the sides.
  • the relational expressions L2 ⁇ L1, ⁇ 1> 90 °, ⁇ 2> 90 °, L2 ⁇ L3 hold for the distances L1, L2, L3 and the angles ⁇ 1, ⁇ 2 defined here.
  • the distances L1, L2, L3 and the angles ⁇ 1, ⁇ 2 can be defined. If the relational expressions L2 ⁇ L1, ⁇ 1> 90 °, ⁇ 2> 90 °, L2 ⁇ L3 hold in at least one of the core region B and the magnet insertion hole 45, the effect of this embodiment can be obtained.
  • the structure in which the first bridge 51 and the second bridge 52 are arranged in multiple stages in the radial direction as shown in FIG. 13 is generally used as a synchronous reluctance motor.
  • reluctance torque is used by increasing the difference between d-axis reluctance and q-axis reluctance by forming cores in multiple stages, but by increasing the number of cores, the number of bridges increases, or The circumferential width of the As a result, the difference between the d-axis reluctance and the q-axis reluctance can not be made sufficiently large.
  • the circumferential width of the first bridge 51 and the second bridge 52 can be narrowed, the difference between the d-axis reluctance and the q-axis reluctance can be increased. It can be used. This makes it possible to increase the torque, increase the efficiency, and reduce the size of the motor.
  • a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided between the core regions B adjacent to each other of the plurality of provided core regions B.
  • the q-axis core 32 located at the outermost periphery of the core region A passes magnetic flux, the q-axis inductance becomes large, and reluctance torque can be utilized.
  • the width of the q-axis core 32 becomes narrow, and the reluctance torque can not be sufficiently utilized.
  • the radial width of the first bridge 51 and the second bridge 52 can be narrowed, the width of the q-axis core 32 can be widened. Furthermore, as a leakage flux reduction effect of the first bridge 51 and the second bridge 52, the d-axis inductance is reduced. Therefore, in the present embodiment, the reluctance torque can be increased and the motor torque can be increased.
  • FIG. 14 and FIG. 14 and 15 are cross-sectional views in a plane perpendicular to the rotation axis of the rotor according to the fifth embodiment of the present invention. Descriptions of matters overlapping with the first embodiment to the fourth embodiment will be omitted.
  • permanent magnets 70 are divided into a plurality of pieces and disposed with respect to one pole.
  • the permanent magnets 70 c and 70 d are arranged in a V shape so as to open toward the outer peripheral side.
  • the permanent magnets 70c, 70d and 70e are arranged in a U-shape so as to open toward the outer peripheral side.
  • the permanent magnets 70 (70c, 70d) (permanent magnets 70c, 70d, 70e in FIG. 15) to be inserted into the magnet insertion holes 45 are divided into a plurality of pieces in order to reduce the heat generation loss due to the eddy current. Are arranged.
  • a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided between the core regions B adjacent to the plurality of provided core regions B.
  • FIG. 16 is a cross-sectional view in a plane perpendicular to the rotation axis of the rotor according to the sixth embodiment of the present invention. Descriptions of matters overlapping with the first to fifth embodiments will be omitted.
  • the magnet insertion hole 45 is divided by the bridge 60, and the permanent magnet 70 is accommodated in at least one of the magnet insertion holes 45.
  • the magnet insertion holes 45 may be holes 40 in which the permanent magnets 70 are not accommodated, and all the magnet insertion holes 45 are holes 40. It may be.
  • the bridge 60 by having the bridge 60 at the magnetic pole center C, in addition to the first bridge 51 and the second bridge 52, three portions for mechanically supporting the core region B in the core region A are the bridge 60. It becomes a bridge.
  • the bridge 60 Since the first bridge 51 and the second bridge 52 are spaced apart from the magnetic pole center C in the circumferential direction, thereby generating bending stress, the bridge 60 is located at the magnetic pole center C, Almost no bending stress is generated in the bridge 60 but only tensile stress is generated. Therefore, the centrifugal force of the core region B is mainly supported by the bridge 60, and the circumferential width of the first bridge 51 and the second bridge 52 can be increased by using the first bridge 51 and the second bridge 52 as auxiliaries. From the sum, the sum of the circumferential widths of the three bridges including the bridge 60 can be smaller, and the leakage flux from the bridges can be reduced.
  • a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided between the core regions B adjacent to the plurality of provided core regions B.
  • FIG. 17 is a cross-sectional view in a plane perpendicular to the rotation axis of the rotor according to the seventh embodiment of the present invention. Descriptions of matters overlapping with the first to sixth examples will be omitted.
  • a third bridge 53 is provided which mechanically joins the core region A and the outermost periphery of the core region B.
  • the flow of air on the surface of the rotor 20 becomes smooth when the rotor 20 rotates, so that mechanical loss due to air friction can be reduced and efficiency can be improved. Further, since the wind noise due to the rotor 20 is reduced, the motor noise can be reduced.
  • a plurality of q-axis cores 32 protruding to the outer peripheral side in the radial direction are provided between the core regions B adjacent to the plurality of provided core regions B.
  • FIG. 18 is a schematic view of a motor vehicle equipped with a rotary electric machine according to an eighth embodiment of the present invention. Descriptions of matters overlapping with the first to seventh embodiments will be omitted.
  • a motor vehicle 200 is provided with a truck 240 provided with a gear 210, wheels 220, an axle 230, and the rotating electrical machine 1.
  • the rotary electric machine 1 drives a wheel 220 connected to an axle 230 via a gear 210.
  • two rotary electric machines 1 are mounted and described as an example, one or three or more may be provided.
  • the rotor 20 of the rotary electric machine 1 of the present embodiment can reduce the bending stress generated in the first bridge 51 and the second bridge 52, and there is an allowance in the mechanical strength of the first bridge 51 and the second bridge 52.
  • the electric machine 1 can be adapted to high speed rotation.
  • the rotary electric machine 1 of the present embodiment can be applied to a motor vehicle 200 such as a railway or a high speed vehicle.
  • the rotating electrical machine 1 used for the motor vehicle 200 can be highly efficient or miniaturized.
  • the highly efficient rotating electrical machine 1 by applying the highly efficient rotating electrical machine 1 to the motor vehicle 200, the power consumed by the rotating electrical machine 1 can be reduced, so that the reduction effect of the power consumption of the motor vehicle 200 accompanying this can be obtained.
  • the under floor space of the motor vehicle 200 can be expanded, and the flexibility of the under floor layout of the motor vehicle 200 can be improved.
  • the motor vehicle 200 can be reduced in weight.
  • Reference Signs List 1 rotating electric machine 10 stators, 11 stator windings, 15 frames, 20 rotors, 30 rotor cores, 32 q-axis cores, 35 cores on C pole center, 36 q-axis cores, 40 holes, 40a hole, 40b hole, 45 magnet insertion hole, 45a magnet insertion hole, 45b magnet insertion hole, 51 first bridge, 51a first bridge, 51b first bridge, 52 second bridge, 52a second bridge, 52b second Two bridges, 53 third bridges, 60 bridges, 70 permanent magnets, 70a permanent magnets, 70b permanent magnets, 70c permanent magnets, 70d permanent magnets, 70e permanent magnets, 90 shafts, 100 gaps, 101 connections, 101a connections, 101b Connection part 102 connection part 102 a connection part 102 b connection part 20 Motor vehicle, 210 gear, 220 wheels, 230 axle 240 dolly

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
PCT/JP2018/031006 2017-10-18 2018-08-22 回転電機及びこれを備えた電動機車両 Ceased WO2019077868A1 (ja)

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KR101872727B1 (ko) * 2016-12-30 2018-06-29 김종원 화재 진압용 자동확산소화기
WO2021093680A1 (zh) * 2019-11-13 2021-05-20 苏州宝时得电动工具有限公司 电机
JP2021129454A (ja) * 2020-02-14 2021-09-02 株式会社豊田自動織機 回転電機のロータ
JP7461285B2 (ja) 2020-12-07 2024-04-03 株式会社日立インダストリアルプロダクツ 永久磁石同期電動機及びその製造方法
JP7773957B2 (ja) * 2022-09-26 2025-11-20 株式会社日立インダストリアルプロダクツ 回転電機、並びに電動車両
JP7642131B1 (ja) * 2024-06-14 2025-03-07 三菱電機ビルソリューションズ株式会社 回転電機及びそのロータ

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