WO2023007707A1 - ロータ及びモータ - Google Patents

ロータ及びモータ Download PDF

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Publication number
WO2023007707A1
WO2023007707A1 PCT/JP2021/028379 JP2021028379W WO2023007707A1 WO 2023007707 A1 WO2023007707 A1 WO 2023007707A1 JP 2021028379 W JP2021028379 W JP 2021028379W WO 2023007707 A1 WO2023007707 A1 WO 2023007707A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet
rotor
rotation axis
rotor body
reference line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/028379
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
義康 柴山
圭伍 今村
一輝 植田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to PCT/JP2021/028379 priority Critical patent/WO2023007707A1/ja
Priority to PCT/JP2022/023675 priority patent/WO2023007968A1/ja
Priority to JP2023538321A priority patent/JP7603820B2/ja
Priority to US18/292,029 priority patent/US20250070604A1/en
Priority to CN202280052335.0A priority patent/CN117813746A/zh
Publication of WO2023007707A1 publication Critical patent/WO2023007707A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024192753A priority patent/JP7706001B2/ja
Ceased legal-status Critical Current

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Classifications

    • 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]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • 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
    • 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 technology disclosed here relates to rotors and motors.
  • Patent Document 1 discloses a motor.
  • This motor has a rotor and a stator.
  • the rotor is of the embedded magnet type and includes a rotor core and a plurality of magnetic pole portions provided on the rotor core.
  • the magnetic pole portion has two magnets arranged in the radial direction of the rotor core.
  • the magnets provided in the rotor core may cause irreversible demagnetization due to the demagnetizing field such as the rotating magnetic field generated by the stator.
  • the magnet arranged radially inward about the rotation axis of the rotor core is the radially outward magnet. is more likely to cause irreversible demagnetization than
  • the technology disclosed here has been made in view of this point, and its purpose is to prevent irreversible demagnetization of the magnet from occurring and to efficiently generate motor torque.
  • the rotor disclosed herein includes a rotor body that rotates about a rotation axis, and a plurality of magnetic pole portions that are arranged in the rotor body in a circumferential direction around the rotation axis and form alternately different magnetic poles in the circumferential direction.
  • the magnetic pole portion includes a first magnet and a second magnet arranged inside the first magnet in a radial direction about the rotation axis, and the dimension in the magnetization direction of the second magnet is larger than the average dimension of the magnetization direction of the first magnet.
  • FIG. 1 is a cross-sectional view of the motor.
  • FIG. 2 is an enlarged sectional view of the motor.
  • FIG. 3 is an enlarged sectional view of the rotor.
  • FIG. 4 is an enlarged cross-sectional view of a modified motor.
  • FIG. 5 is an enlarged sectional view of another modified motor.
  • FIG. 6 is an enlarged cross-sectional view of a motor of still another modification.
  • FIG. 7 is an enlarged cross-sectional view of a motor of still another modification.
  • FIG. 8 is an enlarged sectional view of a motor of still another modification.
  • FIG. 9 is an enlarged sectional view of a motor of still another modification.
  • FIG. 10 is an enlarged cross-sectional view of a motor of still another modification.
  • FIG. 1 shows a motor 100 according to an embodiment.
  • the motor 100 includes a rotor 1 that rotates around a predetermined rotation axis A, and a stator 6 that rotates the rotor 1 around the rotation axis A. Permanent magnets are embedded in the rotor 1 . That is, the motor 100 is an IPM (Interior Permanent Magnet) motor.
  • the motor 100 may further include a motor case 7 .
  • a motor case 7 accommodates the rotor 1 and the stator 6 .
  • the stator 6 is fixed with respect to the motor case 7 .
  • the rotor 1 is rotatably supported by the motor case 7 .
  • rotational axis direction A circumferential direction about the rotation axis A is called a “circumferential direction”.
  • a radial direction about the rotation axis A is called a “radial direction”.
  • a side facing the rotation axis A in the radial direction is referred to as a “radial inner side”.
  • the side opposite to the axis of rotation A is called the "radial outer side”.
  • the stator 6 has a stator core 61 and windings 62 .
  • Stator core 61 is a soft magnetic material.
  • the stator core 61 is formed, for example, from a plurality of laminated electromagnetic steel sheets.
  • the stator core 61 is formed in an annular shape. Specifically, stator core 61 is formed in a cylindrical shape. The stator core 61 is fixed to the motor case 7 . The stator core 61 is formed with a plurality of teeth 61a projecting inwardly of the stator core 61 . A plurality of teeth 61a are arranged in a line in the circumferential direction of stator core 61 at intervals. The winding 62 is wound around a plurality of teeth 61a. The stator 6 forms a rotating magnetic field that rotates the rotor 1 when current is supplied to the windings 62 .
  • the rotor 1 includes a rotor body 2 that rotates around a rotation axis A, and a plurality of magnetic pole portions 4 that are arranged in the rotor body 2 in the circumferential direction and form magnetic poles that are alternately different in the circumferential direction.
  • At least part of the rotor body 2 is made of a soft magnetic material.
  • the rotor body 2 has magnetic saliency and generates reluctance torque in the rotating magnetic field generated by the stator 6 .
  • the rotor body 2 includes a rotor core 20 and a shaft 5 .
  • the rotor core 20 is a soft magnetic material.
  • the rotor core 20 is formed, for example, from a plurality of electromagnetic steel sheets laminated together.
  • the rotor core 20 is formed in an annular shape surrounding the rotation axis A. As shown in FIG. Specifically, rotor core 20 is formed in a cylindrical shape concentric with stator core 61 .
  • the outer peripheral surface of the rotor core 20 forms the outer peripheral surface 28 of the rotor body 2 .
  • the cross-sectional shape of rotor core 20 orthogonal to rotation axis A is the same over the entire length of rotor core 20 in the rotation axis direction.
  • An air gap 10 is formed between the outer peripheral surface of rotor core 20 and the inner peripheral surface of stator core 61 .
  • the shaft 5 is fitted inside the rotor core 20 .
  • Shaft 5 is fixed to rotor core 20 .
  • the axis of the shaft 5 coincides with the rotation axis A.
  • the shaft 5 is rotatably supported by the motor case 7 via bearings and the like.
  • the rotor core 20 rotates around the rotation axis A together with the shaft 5 .
  • the shaft 5 is a soft magnetic material.
  • a plurality of magnetic pole portions 4 are provided on the rotor core 20 .
  • a plurality of magnetic pole portions 4 generate magnet torque in a rotating magnetic field formed by stator 6 .
  • the rotor 1 includes six magnetic pole portions 4 as the plurality of magnetic pole portions 4 .
  • the plurality of magnetic pole portions 4 are arranged at regular intervals in the circumferential direction.
  • each magnetic pole piece 4 of the rotor 1 contains a plurality of magnets. Specifically, each magnetic pole portion 4 includes two magnets, a first magnet 41 and a second magnet 42 . The first magnet 41 and the second magnet 42 are arranged radially with an interval therebetween. The second magnet 42 is arranged radially inside the first magnet 41 . In this example, the first magnet 41 and the second magnet 42 are formed in layers. That is, the magnetic pole portion 4 has two magnet layers of the first magnet 41 and the second magnet 42 .
  • a bonded magnet is a permanent magnet made of a magnetic material that includes magnet powder and a binder that binds the magnet powder.
  • the magnetic powder is, for example, a powder of a neodymium magnet, a samarium-iron-nitrogen magnet, a samarium-cobalt magnet, a ferrite magnet, an alnico magnet, or a mixture of two or more of these powders.
  • the binder is, for example, thermosetting resin such as epoxy resin, thermoplastic resin such as polyamide resin, or rubber.
  • the rotor core 20 is formed with a first arrangement hole 21 in which the first magnets 41 are arranged and a second arrangement hole 22 in which the second magnets 42 are arranged.
  • Each of the first arrangement hole 21 and the second arrangement hole 22 is a hole penetrating the rotor core 20 in the rotation axis direction.
  • the shape of the cross section of the first arrangement hole 21 orthogonal to the rotation axis A is the same as the shape of the cross section of the first magnet 41 orthogonal to the rotation axis A.
  • the shape of the cross section of the second arrangement hole 22 perpendicular to the rotation axis A is the same as the shape of the cross section of the second magnet 42 perpendicular to the rotation axis A.
  • the first magnet 41 and the second magnet 42 are formed by insert molding, for example.
  • the first magnets 41 and the second magnets 42 are formed by injecting a magnet material that will become the bond magnets into a mold containing the rotor core 20 . That is, the first magnet 41 and the second magnet 42 are hardened magnet materials filled in the first placement hole 21 and the second placement hole 22 of the rotor core 20, respectively.
  • the first placement hole 21 is filled with the first magnet 41 .
  • the second placement hole 22 is filled with the second magnet 42 .
  • Each of the first magnet 41 and the second magnet 42 is formed in a plate shape extending along the rotation axis A.
  • a cross-sectional shape perpendicular to the rotation axis A of the rotor 1 will be described below. “Cross-sectional shape” means a cross-sectional shape orthogonal to the rotation axis A unless otherwise specified.
  • the cross-sectional shape of the first magnet 41 orthogonal to the rotation axis A is the same over the entire length of the first magnet 41 in the rotation axis direction.
  • the cross-sectional shape of the second magnet 42 perpendicular to the rotation axis A is the same over the entire length of the second magnet 42 in the rotation axis direction.
  • each of the first magnet 41 and the second magnet 42 is linear. That is, the cross-sectional shape of the first magnet 41 has a shape extending along the predetermined first reference line R1.
  • the cross-sectional shape of the second magnet 42 has a shape extending along a predetermined second reference line R2.
  • the first magnet 41 has two ends 41a and 41b in the direction in which the first reference line R1 extends, and an intermediate portion 41c located between the two ends 41a and 41b.
  • first end 41a and second end 41b respectively.
  • the second magnet 42 has two ends 42a and 42b in the direction in which the second reference line R2 extends, and an intermediate portion 42c located between the two ends 42a and 42b.
  • first end 42a and second end 42b when distinguishing between the two ends 42a and 42b, they are referred to as "first end 42a” and “second end 42b", respectively.
  • the intermediate portion 41c does not refer to the entire remaining portion of the first magnet 41 excluding the two ends 41a and 41b, but at least a portion of the remaining portion excluding the two ends 41a and 41b. point to The intermediate portion 41c may or may not include the center of the first magnet 41 in the direction in which the first reference line R1 extends.
  • the intermediate portion 42c does not refer to all the remaining portions of the second magnet 42 except for the two ends 42a and 42b, but refers to at least a portion of the remaining portions excluding the two ends 42a and 42b. .
  • the intermediate portion 42c may or may not include the center of the second magnet 42 in the direction in which the second reference line R2 extends.
  • the direction parallel to the plane perpendicular to the rotation axis A and perpendicular to the first reference line R1 is also referred to as the thickness direction.
  • the direction parallel to the plane perpendicular to the rotation axis A and perpendicular to the second reference line R2 is also referred to as the thickness direction.
  • the first magnet 41 is curved or bent so as to be concave radially inward.
  • the intermediate portion 41c is positioned closer to the rotation axis A than the two end portions 41a and 41b. That is, the first magnet 41 is curved or bent so that the two ends 41a and 41b are closer to the outer peripheral surface 28 of the rotor body 2 (that is, the outer peripheral surface of the rotor core 20) than the intermediate portion 41c.
  • the first magnet 41 is formed in a substantially U shape.
  • the first magnet 41 is formed in an arcuate shape that is concaved radially inward. More specifically, the cross-sectional shape of the first magnet 41 is a line-symmetrical shape about the axis of symmetry extending in the radial direction.
  • the second magnet 42 is curved or bent so as to be concave radially inward.
  • the intermediate portion 42c is recessed toward the rotation axis A from the two end portions 42a and 42b. That is, the second magnet 42 is curved or bent such that the two ends 42a and 42b are closer to the outer peripheral surface 28 of the rotor body 2 than the intermediate portion 42c.
  • the second magnet 42 is formed in a substantially U shape.
  • the second magnet 42 is formed in an arcuate shape concaved radially inward. More specifically, the cross-sectional shape of the second magnet 42 is a line-symmetrical shape about the axis of symmetry extending in the radial direction.
  • the axis of symmetry that is the center of the line-symmetrical shape of the second magnet 42 coincides with the axis of symmetry that is the center of the line-symmetrical shape of the first magnet 41 .
  • the axis of symmetry of the first magnet 41 and the axis of symmetry of the second magnet 42 are set to the d-axis of the rotor 1, for example.
  • the first magnet 41 is magnetized in a direction parallel to a plane orthogonal to the rotation axis A and intersecting the first reference line R1 (more specifically, a direction orthogonal to the first reference line R1, that is, a thickness direction).
  • the second magnet 42 is magnetized in a direction parallel to a plane orthogonal to the rotation axis A and intersecting the second reference line R2 (more specifically, a direction orthogonal to the second reference line R2, that is, a thickness direction).
  • the first magnet 41 is continuous over the direction in which the first reference line R1 extends, that is, it is not divided.
  • the second magnet 42 is divided halfway in the direction in which the second reference line R2 extends.
  • the rotor core 20 has a dividing wall 23 that divides the second arrangement hole 22 .
  • the dividing wall 23 connects a portion of the rotor core 20 located radially inside the second arrangement hole 22 and a portion located radially outside the second arrangement hole 22 .
  • the dividing wall 23 is arranged at the center of the second arrangement hole 22 in the direction in which the second reference line R2 extends.
  • the dividing wall 23 extends in a direction that intersects the second reference line R2, more specifically, in a direction that intersects the second reference line R2 in a cross section perpendicular to the rotation axis A. As shown in FIG. In this example, the dividing wall 23 extends radially.
  • the second arrangement hole 22 is divided by a dividing wall 23 into two dividing holes 22a and 22b aligned in the direction in which the second reference line R2 extends.
  • the second magnet 42 is divided by the dividing wall 23 into two magnet pieces 43 and 44 aligned in the direction in which the second reference line R2 extends.
  • the two magnet pieces 43, 44 are arranged in the two split holes 22a, 22b, respectively.
  • the split holes 22a and 22b are filled with magnet pieces 43 and 44, respectively.
  • the dimension t1a in the magnetization direction of the portion of the first magnet 41 located radially outside of the dividing wall 23 is larger than the dimension t1b of Specifically, a protrusion 45 that protrudes radially outward is formed in a portion of the first magnet 41 located radially outward of the dividing wall 23 .
  • the dimension in the magnetization direction of the portion of the first magnet 41 where the projection 45 is formed is the dimension t1a.
  • the dimension t1b in the magnetization direction of the portion of the first magnet 41 other than the portion where the protrusion 45 is formed is constant over the direction in which the first reference line R1 extends.
  • the dimension t1a is also the maximum dimension of the first magnet 41 in the magnetization direction.
  • the dimension t1b is also the minimum dimension of the magnetization direction of the first magnet 41 . That is, the dimension t1a in the magnetization direction of the portion of the first magnet 41 where the protrusion 45 is formed is larger than the dimension t1b in the magnetization direction of the other portion of the first magnet 41 .
  • the dimension t2 in the magnetization direction of the second magnet 42 is constant over the direction in which the second reference line R2 extends.
  • the dimension t2 is also the minimum value, the maximum value, and the average value of the dimension in the magnetization direction of the second magnet 42 .
  • the average value of the dimension in the magnetization direction of the second magnet 42 is the average value of the dimension in the magnetization direction of the first magnet 41 (ie, the direction of the first reference line R1) average value over ).
  • the minimum value of the dimension in the magnetization direction of the second magnet 42 is larger than the minimum value of the dimension in the magnetization direction of the first magnet 41 (that is, dimension t1b).
  • the dimension in the magnetization direction of the second magnet 42 is greater than the minimum value of the dimension in the magnetization direction of the first magnet 41 over the entire length in the direction in which the second reference line R2 extends.
  • the two ends 41a, 41b of the first magnet 41 and the two ends 42a, 42b of the second magnet 42 are arranged close to the outer peripheral surface 28 of the rotor body 2, i.e. arranged to face each other.
  • the two ends 41a, 41b of the first magnet 41 are positioned between the two ends 42a, 42b of the second magnet 42 in the circumferential direction.
  • a notch 24 is formed in a portion of the rotor core 20 located radially outward of the two ends 41 a and 41 b of the first magnet 41 .
  • a notch 25 is formed in a portion of the rotor core 20 located radially outward of the two ends 42 a and 42 b of the second magnet 42 .
  • the cutouts 24 and 25 are formed on the outer peripheral surface of the rotor core 20 and open radially outward of the rotor core 20 .
  • the cutouts 24 and 25 are formed over the entire length of the rotor core 20 in the rotation axis direction.
  • the cross-sectional shape of the cutouts 24 and 25 perpendicular to the rotation axis A is, for example, rectangular.
  • the two ends 41 a and 41 b of the first magnet 41 are positioned radially inwardly away from the outer peripheral surface 28 of the rotor body 2 .
  • the two ends 42 a and 42 b of the second magnet 42 are positioned radially inwardly apart from the outer peripheral surface 28 of the rotor body 2 .
  • the rotor core 20 has portions 33 and 34 located radially outside the two ends 41 a and 42 b of the first magnet 41 .
  • the rotor core 20 has portions 35 and 36 located radially outside the two ends 42 a and 42 b of the second magnet 42 .
  • the first end 41a of the first magnet 41 and the first end 42a of the second magnet 42 are adjacent to each other in the circumferential direction.
  • the second end 41b of the first magnet 41 and the second end 42b of the second magnet 42 are adjacent to each other in the circumferential direction.
  • a portion 31 of the rotor core 20 between the first end portion 41 a and the first end portion 42 a protrudes radially outward from the portions 33 , 34 , 35 and 36 of the rotor core 20 .
  • a portion 32 of the rotor core 20 between the second end portion 41 b and the second end portion 42 b protrudes radially outward beyond the portions 33 , 34 , 35 and 36 of the rotor core 20 .
  • a portion of the rotor core 20 between the notch 24 and the notch 25 is a projecting portion projecting radially outward.
  • each magnetic pole portion 4 includes a plurality of magnets arranged in the radial direction, the magnetic flux generated by the stator 6 can easily pass through the rotor body 2 compared to the case where the magnetic pole portion 4 is formed by a single magnet. , reluctance torque is easily obtained.
  • the average value of the dimensions in the magnetization direction of the second magnets 42 (that is, the dimension t2) is larger than the average value of the dimensions in the magnetization direction of the first magnets 41.
  • the permeance coefficient of the second magnet 42 can be increased to make irreversible demagnetization of the second magnet 42 difficult to occur. That is, the magnetic permeability of a magnet is substantially the same as the magnetic permeability of air, and when the first magnet 41 is positioned in the magnetic circuit formed by the second magnet 42 as in this example, the first magnet 41 is regarded as an air gap. As a result, the permeance coefficient of the second magnet 42 tends to decrease.
  • the permeance coefficient of the second magnet 42 can be increased, and irreversible demagnetization of the second magnet 42 can be made difficult to occur.
  • the volume of the rotor body 2 can be increased. The generated reluctance torque can be improved.
  • the magnetic flux generated by the stator 6 passes through, and this flux can cause the ends of the magnet to demagnetize.
  • the rotor 1 of this example includes portions 33 and 34 of the rotor body 2 located radially outside the two ends 41a and 41b of the first magnet 41 and the two ends 42a of the second magnet 42. , 42b are formed with cutouts 24 and 25, and the distance L1 from the ends 41a and 41b of the first magnet 41 to the stator 6 and the end of the second magnet 42 The distance L2 from 42a, 42b to the stator 6 can be lengthened. Therefore, demagnetization by the stator 6 of each of the first magnets 41 and the second magnets 42 can be made difficult to occur.
  • the cutouts 24 and 25 increase the magnetic resistance in the outer regions of the two ends 41a and 41b of the first magnet 41 and the two ends 41a and 41b of the second magnet 42, respectively. Therefore, it becomes difficult for the magnetic flux generated by the stator 6 to pass through the outer regions of the ends 41a, 41b, 42a, and 42b of the first magnet 41 and the second magnet 42, respectively. demagnetization of each of the can be made difficult to occur. Also, if the rotor body 2 does not exist in the outer regions of the ends 41a, 41b, 42a, and 42b of the first magnet 41 and the second magnet 42, the rotor core 20 and the inner peripheral surface of the stator core 61 will be separated from each other.
  • the portions 33 and 34 are located radially outside the two ends 41a and 41b of the first magnet 41 in the rotor body 2, and the two ends of the second magnet 42 Portions 35, 36 are positioned radially outwardly of 42a, 42b.
  • the air gap 10 formed between the rotor core 20 and the inner peripheral surface of the stator core 61 can be made small, and the magnetic flux generated by the stator 6 can easily flow to the rotor 1, so that the torque of the motor 100 can be efficiently transferred. can be generated.
  • the first arrangement hole 21 and the second arrangement hole 22 are made larger than the first magnet 41 and the second magnet 42, respectively. and a part of the first arrangement hole 21 and the second arrangement hole 22 may be the gaps adjacent to the ends 41 a and 41 b of the first magnet 41 and the gaps adjacent to the ends of the second magnet 42 .
  • the first magnet 41 and the second magnet 42 are bond magnets formed by filling the first placement hole 21 and the second placement hole 22 with a magnetic material
  • the first placement hole 21 and the second placement hole Since the bond magnet is formed in the whole of 22, it is difficult to form the air gap. Therefore, when the first magnet 41 and the second magnet 42 are bond magnets, it is preferable to form the notches 24 and 25 in the rotor body 2 .
  • portions 31 and 32 between the two ends 41a and 41b of the first magnet 41 and the two ends 42a and 42b of the second magnet 42 are the two ends of the first magnet 41 in the rotor body 2. It protrudes radially outward beyond the radially outer portions 33, 34 of the portions 41a, 41b and the radially outer portions 35, 36 of the two ends 42a, 42b of the second magnet 42 in the rotor body 2. . Therefore, the air gap 10 between the portions 31, 32 and the stator core 61 can be reduced, and the torque of the motor 100 can be generated more efficiently.
  • the rotor body 2 is formed with a first arrangement hole 21 in which the first magnets 41 are arranged and a second arrangement hole 22 in which the second magnets 42 are arranged.
  • 2 includes a dividing wall 23 that connects a portion located radially inside the second placement hole 22 and a portion located radially outside the second placement hole 22 to divide the second placement hole 22 . . Therefore, the magnetic flux generated by the stator 6 can easily pass through the dividing wall 23 and can hardly pass through the second magnets 42 arranged in the second arrangement holes 22 . Therefore, the diamagnetic field demagnetization of the second magnet 42 is less likely to occur.
  • the first placement hole 21 is one undivided hole. Therefore, the volume of the first magnet 41 arranged in the first arrangement hole 21 can be increased, and the magnet torque can be improved.
  • the magnetic flux generated by the stator 6 can easily pass through the portion of the first magnet 41 located radially outside the dividing wall 23, and the diamagnetic field demagnetization of the first magnet 41 is reduced. may occur.
  • the dimension t1a in the magnetization direction of the portion of the first magnet 41 located radially outside of the dividing wall 23 (that is, the portion where the protrusion 45 is formed) is different from the magnetization direction of the other portions of the first magnet 41. is greater than the dimension t1b of Therefore, the permeance coefficient of the portion of the first magnet 41 located radially outside of the dividing wall 23 can be increased, and the diamagnetic field demagnetization of the first magnet 41 is less likely to occur.
  • each of the first magnet 41 and the second magnet 42 is a bond magnet.
  • a bonded magnet can be molded like a resin, and has a higher degree of freedom in shape than a sintered magnet. Therefore, it is easy to form each of the first magnet 41 and the second magnet 42 into a desired shape.
  • the rotor 1 includes a rotor body 2 that rotates about the rotation axis A, and a plurality of magnetic poles that are arranged in the rotor body 2 in the circumferential direction about the rotation axis A and form different magnetic poles alternately in the circumferential direction.
  • the magnetic pole portion 4 includes a first magnet 41 and a second magnet 42 arranged inside the first magnet 41 in a radial direction about the rotation axis A. is larger than the average value of the magnetization direction dimensions of the first magnet 41 (for example, the dimension t2).
  • the motor 100 also includes a rotor 1 and a stator 6 that drives the rotor 1 .
  • the first magnet 41 has a shape extending along a predetermined first reference line R1 in a cross section orthogonal to the rotation axis A, and has two ends 41a and 41b and two ends 41a and 41b in the direction of the first reference line R1.
  • 41a and 41b, and the second magnet 42 has a shape extending along a predetermined second reference line R2 in a cross section orthogonal to the rotation axis A.
  • the first magnet 41 has two ends 42a, 42b in the direction of and an intermediate portion 42c located between the two ends 42a, 42b, the first magnet 41 having the two ends 41a, 41b closer to the intermediate portion 41c
  • the second magnet 42 has two ends 42a and 42b closer to the outer peripheral surface 28 of the rotor body 2 than the intermediate portion 42c. Curved or bent to get closer.
  • the first magnets 41 and the second magnets 42 perpendicular to the rotation axis A is linear
  • the first magnets 41 and the The volume ratio of the second magnet 42 can be increased, and magnet torque can be improved.
  • the first magnet 41 is magnetized in a direction parallel to the plane perpendicular to the rotation axis A and intersecting the first reference line R1
  • the second magnet 42 is parallel to the plane perpendicular to the rotation axis A and is magnetized in the direction perpendicular to the first reference line R1. 2 It is magnetized in a direction crossing the reference line R2.
  • the Irreversible demagnetization of the two magnets 42 is unlikely to occur, and the torque of the motor 100 can be efficiently generated.
  • portions 33 and 34 of the rotor body 2 positioned radially outward of the ends 41a and 41b of the first magnet 41 and portions 35 and 36 positioned radially outward of the ends 42a and 42b of the second magnet 42 Notches 24, 25 or holes 26, 27 are formed in at least one of them.
  • the rotor 1 includes a rotor body 2 that rotates about the rotation axis A, and a plurality of magnets that are arranged in the rotor body 2 in the circumferential direction around the rotation axis A and form alternately different magnetic poles in the circumferential direction.
  • 41, 42 that is, permanent magnets
  • the rotor body 2 is positioned radially outside of the ends 41a, 41b, 42a, 42b of the rotor body 2 in a cross section orthogonal to the rotation axis A of the magnets 41, 42 to At 36, notches 24, 25 or holes 26, 27 are formed.
  • portions 33 and 34 of the rotor body 2 located radially outside the ends 41a and 41b of the first magnet 41 or portions 35 and 36 located radially outside the ends 42a and 42b of the second magnet 42 reduces the air gap 10 formed between the outer peripheral surface 28 of the rotor body 2 and the inner peripheral surface of the stator core 61 . Therefore, the amount of leakage magnetic flux of the stator 6 can be reduced, and the torque of the motor 100 can be efficiently generated.
  • portions 33 and 34 of the rotor body 2 positioned radially outward of the ends 41a and 41b of the first magnet 41 and portions 35 and 36 positioned radially outward of the ends 42a and 42b of the second magnet 42 are formed with notches 24, 25 or holes 26, 27.
  • the diamagnetic field demagnetization of the first magnet 41 and the second magnet 42 can be made difficult to occur.
  • a portion 31 (or 32) between one end 41a (or 41b) of the first magnet 41 and one end 42a (or 42b) of the second magnet 42 in the rotor body 2 is the rotor body. 2, the radially outer portion 33 (or 34) of one end 41a (or 41b) of the first magnet 41 and the radially outer portion 35 of one end 42a (or 42b) of the second magnet 42 (or 36) to the outside of the rotor body 2.
  • the portion 31 (or 32) between the end 41a (or 41b) of the first magnet 41 and the end 42a (or 42b) of the second magnet 42 in the rotor body 2 and the stator core 61 The air gap 10 between can be made small, and the torque of the motor 100 can be generated more efficiently.
  • the rotor body 2 is formed with a first arrangement hole 21 in which the first magnets 41 are arranged and a second arrangement hole 22 in which the second magnets 42 are arranged. It has a dividing wall 23 that connects a portion located radially inside the placement hole 22 and a portion located radially outside the second placement hole 22 to divide the second placement hole 22 . is one undivided hole.
  • the rotor 1 includes a rotor body 2 that rotates about a rotation axis A, and a plurality of magnetic poles that are arranged in the rotor body 2 in the circumferential direction around the rotation axis A and form different magnetic poles alternately in the circumferential direction.
  • the magnetic pole portion 4 includes a first magnet 41 and a second magnet 42 arranged radially inward of the first magnet 41 in the rotor body 2 .
  • a first arrangement hole 21 in which the magnet 41 is arranged and a second arrangement hole 22 in which the second magnet 42 is arranged are formed.
  • It has a dividing wall 23 that divides the second arrangement hole 22 by connecting a portion positioned on the inner side of the second arrangement hole 22 and a portion positioned on the outer side of the second arrangement hole 22 in the radial direction, and the first arrangement hole 21 is divided. There is one hole that does not exist.
  • the magnetic flux generated by the stator 6 can easily pass through the dividing wall 23 and can hardly pass through the second magnets 42 arranged in the second placement holes 22 . Therefore, the diamagnetic field demagnetization of the second magnet 42 can be made difficult to occur.
  • the first arrangement hole 21 is a single hole that is not divided, the volume of the first magnet 41 arranged in the first arrangement hole 21 can be increased, and the magnet torque can be improved.
  • the dimension in the magnetization direction of the portion of the first magnet 41 located radially outside of the dividing wall 23 is equal to the dimension in the magnetization direction of the other portion of the first magnet 41 (for example, dimension t1b).
  • each of the first magnet 41 and the second magnet 42 is a bond magnet.
  • each of the first magnet 41 and the second magnet 42 can be easily formed into a desired shape.
  • the rotor body 2 may be formed only by the rotor core 20 without the shaft 5.
  • the rotor body 2 may be formed only by the shaft 5 without the rotor core 20 .
  • the shaft 5 does not have to be a soft magnetic material.
  • Shaft 5 may be formed integrally with rotor core 20 .
  • holes 26 and 27 may be formed in the rotor body 2 instead of the cutouts 24 and 25 .
  • the notches 24, 25 or the holes 26, 27 are positioned outside the ends 41a, 41b of the first magnet 41 and the ends 42a, 42b of the second magnet 42 of the rotor core 20. It suffices if it is formed in at least one of the portions 35 and 36 .
  • the cross-sectional shape of each of the cutouts 24, 25 and the holes 26, 27 is not limited, and may be, for example, triangular or semicircular.
  • the number of magnetic pole portions 4 that the rotor 1 has is not limited.
  • the number of magnets that magnetic pole portion 4 has is not limited, and magnetic pole portion 4 may include three or more magnets, or may include only one magnet.
  • Each of the first magnet 41 and the second magnet 42 may be an anisotropic bonded magnet or an isotropic bonded magnet. Also, each of the first magnet 41 and the second magnet 42 may be a sintered magnet formed by sintering magnetic powder.
  • the cross-sectional shape of each of the first magnet 41 and the second magnet 42 is not limited to an arc.
  • the cross-sectional shape of each of the first magnet 41 and the second magnet 42 may be, for example, substantially V-shaped or substantially W-shaped.
  • the protrusion 45 of the first magnet 41 may protrude radially inward. Further, a pair of projections projecting radially outward and radially inward may be formed in a portion of the first magnet 41 positioned radially outward of the dividing wall 23 . In this case as well, the dimension in the magnetization direction of the portion of the first magnet 41 located radially outside the dividing wall 23 can be increased. The dimension in the magnetization direction of the first magnet 41 may be constant over the entire length in the direction in which the first magnet 41 extends in the cross section orthogonal to the rotation axis A.
  • the second magnet 42 may be divided at a plurality of locations in the extending direction of the second reference line R2, and the second magnet 42 may have three or more magnet pieces.
  • the dimension t2 in the magnetization direction of the second magnet 42 may not be constant. Also, the dimension t2 in the magnetization direction of the second magnet 42 may be larger than the maximum value of the dimension in the magnetization direction of the first magnet 41 .
  • FIG. 5 shows a cross-sectional view of the motor 100 of still another modification.
  • Motor 100 shown in FIG. 5 differs from motor 100 shown in FIG.
  • FIG. 6 shows a cross-sectional view of the motor 100 of still another modification.
  • a motor 100 shown in FIG. 6 differs from the rotor 1 shown in FIG.
  • FIG. 7 shows a cross-sectional view of the motor 100 of still another modification.
  • the motor 100 shown in FIG. 7 differs from the motor 100 shown in FIG. 2 in that the rotor 1 does not have the notch 24 .
  • FIG. 8 shows a cross-sectional view of the motor 100 of still another modification.
  • Motor 100 shown in FIG. 8 differs from motor 100 shown in FIG.
  • FIG. 9 shows a cross-sectional view of the motor 100 of still another modification.
  • the magnetic pole portion 4 includes a third magnet 46 in addition to the first magnet 41 and the second magnet 42 .
  • the third magnets 46 are arranged radially inside the second magnets 42 in the rotor core 20 .
  • the average value of the dimension in the magnetization direction of the third magnet 46 is larger than the average value of the dimension in the magnetization direction of the second magnet 42 .
  • the average value of the dimensions in the magnetization direction of the third magnet 46 may be the same as the average value of the dimensions in the magnetization direction of the second magnets 42 , or the average value of the dimensions in the magnetization direction of the second magnets 42 may be smaller.
  • FIG. 10 shows a cross-sectional view of a motor 100 of still another modification.
  • the magnetic pole portion 4 includes only one layer of magnets 40
  • the rotor core 20 has cutouts 24 formed in portions positioned outside the two ends of the magnets 40 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
PCT/JP2021/028379 2021-07-30 2021-07-30 ロータ及びモータ Ceased WO2023007707A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PCT/JP2021/028379 WO2023007707A1 (ja) 2021-07-30 2021-07-30 ロータ及びモータ
PCT/JP2022/023675 WO2023007968A1 (ja) 2021-07-30 2022-06-13 ロータ及びモータ
JP2023538321A JP7603820B2 (ja) 2021-07-30 2022-06-13 ロータ及びモータ
US18/292,029 US20250070604A1 (en) 2021-07-30 2022-06-13 Rotor and motor
CN202280052335.0A CN117813746A (zh) 2021-07-30 2022-06-13 转子以及马达
JP2024192753A JP7706001B2 (ja) 2021-07-30 2024-11-01 ロータ及びモータ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/028379 WO2023007707A1 (ja) 2021-07-30 2021-07-30 ロータ及びモータ

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WO2023007707A1 true WO2023007707A1 (ja) 2023-02-02

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PCT/JP2021/028379 Ceased WO2023007707A1 (ja) 2021-07-30 2021-07-30 ロータ及びモータ
PCT/JP2022/023675 Ceased WO2023007968A1 (ja) 2021-07-30 2022-06-13 ロータ及びモータ

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JP2014525232A (ja) * 2011-08-05 2014-09-25 グリー エレクトリック アプライアンシーズ インク オブ ズーハイ モーター及びその回転子
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JP2025016672A (ja) 2025-02-04
JP7706001B2 (ja) 2025-07-10
WO2023007968A1 (ja) 2023-02-02
JPWO2023007968A1 (https=) 2023-02-02
JP7603820B2 (ja) 2024-12-20
CN117813746A (zh) 2024-04-02

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