WO2018163319A1 - Rotor et machine électrique tournante équipée dudit rotor - Google Patents

Rotor et machine électrique tournante équipée dudit rotor Download PDF

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Publication number
WO2018163319A1
WO2018163319A1 PCT/JP2017/009235 JP2017009235W WO2018163319A1 WO 2018163319 A1 WO2018163319 A1 WO 2018163319A1 JP 2017009235 W JP2017009235 W JP 2017009235W WO 2018163319 A1 WO2018163319 A1 WO 2018163319A1
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WO
WIPO (PCT)
Prior art keywords
rotor
permanent magnet
insertion hole
rotation axis
magnet
Prior art date
Application number
PCT/JP2017/009235
Other languages
English (en)
Japanese (ja)
Inventor
龍吉 木嶋
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/009235 priority Critical patent/WO2018163319A1/fr
Publication of WO2018163319A1 publication Critical patent/WO2018163319A1/fr

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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

Definitions

  • the present invention relates to a rotor and a rotary electric motor including the rotor.
  • Rotating motors are known to have an annular stator that is fixedly supported by shrink fitting or the like on the inner wall surface of a sealed container, and a rotor that is rotatably attached to the inner side surface of the stator.
  • the rotor has a rotor core formed by stacking a plurality of electromagnetic steel sheets punched into a predetermined shape, permanent magnets inserted into a plurality of magnet insertion holes formed in the rotor core, and both end surfaces of the rotor core in the rotation axis direction. And an arranged end plate.
  • the size of the magnet insertion hole is designed to be larger than the dimension of the permanent magnet. This is for avoiding the generation of thermal stress due to temperature changes, as well as making it easier to insert the permanent magnet into the magnet insertion hole.
  • the permanent magnet moves inside the magnet insertion hole when the rotor rotates, so that the rotation balance of the rotor fluctuates and noise is generated during operation of the rotary motor.
  • Patent Document 1 discloses a motor rotor having a structure in which a pressing portion that presses a permanent magnet in the rotation axis direction is formed on an end plate.
  • the pressing portion is formed by deforming a part of the end plate so that a part thereof enters the magnet insertion hole at a position corresponding to the magnet insertion hole.
  • a rotor of a rotary motor is manufactured by separate processes for an electromagnetic steel plate and an end plate. Therefore, when the rotor is small, it is difficult to align the pressing portion formed on the end plate with the magnet insertion hole formed on the electromagnetic steel plate, and there is a possibility that the permanent magnet cannot be sufficiently pressed by the pressing portion.
  • the rotary electric motor disclosed in Patent Document 1 requires a separate mold for forming the pressing portion on the end plate, which increases manufacturing costs.
  • the present invention has been made to solve the above-described problems, and can firmly fix the permanent magnet inserted into the magnet insertion hole of the rotor core, thereby reducing noise generated during operation of the rotary motor.
  • An object of the present invention is to provide a rotor and a rotary electric motor including the rotor.
  • a rotor according to the present invention is formed by laminating a plurality of steel plates in the rotation axis direction, and has a rotor core having a plurality of magnet insertion holes penetrated in the rotation axis direction, and a permanent magnet inserted into the magnet insertion hole, An end plate disposed on an end surface of the rotor core in the rotation axis direction, and the steel plate disposed on one end side or the other end side of the rotor core is inserted into the magnet insertion hole.
  • a pressing portion is formed in contact with the end of the permanent magnet to press the permanent magnet in the direction of the rotation axis.
  • the steel plate in which the pressing portion that contacts the end portion of the permanent magnet inserted into the magnet insertion hole and presses in the direction of the rotation axis is disposed on one end side or the other end side of the rotor core. Therefore, the position of the permanent magnet can be firmly fixed by the pressing portion, and noise generated during operation of the rotary motor can be reduced.
  • FIG. 3 is a plan view illustrating the rotor according to the first embodiment of the present invention with the end plate omitted.
  • FIG. 4 is an enlarged cross-sectional view taken along line AA shown in FIG. 3.
  • FIG. 5 is an enlarged cross-sectional view taken along line AA in FIG. 3 showing a modification of the rotor according to the first embodiment of the present invention.
  • FIG. 5 is an enlarged cross-sectional view taken along line AA in FIG. 3 showing a modification of the rotor according to the first embodiment of the present invention.
  • FIG. 10 is a longitudinal cross-sectional view showing a magnet insertion hole portion in which the end plate is omitted, which is a modification of the rotor according to the third embodiment.
  • FIG. 1 is a plan view showing a rotary electric motor including a rotor according to Embodiment 1 of the present invention.
  • FIG. 2 is a longitudinal sectional view showing the rotor according to the first embodiment.
  • FIG. 3 is a plan view illustrating the rotor according to the first embodiment with the end plates omitted.
  • FIG. 4 is an enlarged cross-sectional view taken along line AA shown in FIG.
  • the rotary motor 300 is attached to an annular stator 200 fixedly supported by shrink fitting or the like on an inner wall surface of a sealed container (not shown) and rotatably attached to the inner surface of the stator 200. And the rotor 100.
  • the stator 200 includes a stator core 201 formed by laminating a plurality of electromagnetic steel plates made of a high permeability material in the rotation axis direction P, and windings (not shown) wound around the stator core 201.
  • the stator core 201 includes a core back part 202 configured in an annular shape and a plurality of teeth parts 203 extending inward from the core back part 202. Note that the winding is provided by winding the conductive wire around the tooth portion 203 a plurality of times.
  • the rotor 100 is disposed on the rotor core 1, the permanent magnet 4 inserted in the magnet insertion hole 3 formed in the rotor core 1, and both end faces of the rotor core 1 in the rotation axis direction P. And an end plate 5 made of a non-magnetic material.
  • the rotor 100 is placed vertically for convenience of explanation.
  • the rotor core 1 is formed by laminating a plurality of electromagnetic steel plates 2 made of a high permeability material punched into an annular shape in the rotation axis direction P.
  • Six substantially rectangular magnet insertion holes 3 are formed in the vicinity of the outer periphery of the rotor core 1 along the circumferential direction.
  • a neodymium permanent magnet 4 is inserted (embedded) in each magnet insertion hole 3.
  • the number of magnet insertion holes 3 is not limited to the six shown in the figure as long as the number corresponds to the number of magnetic poles.
  • the waveform of the counter electromotive force generated in the winding wound around the stator core 201 is brought close to a sine wave on each outer peripheral side of the magnet insertion hole 3 to suppress vibration and noise of the rotary motor 300.
  • a plurality of slits 11 to be opened are formed.
  • seven slits 11 are formed as an example on each outer peripheral side of the magnet insertion hole 3.
  • an air hole portion 12 through which discharge gas passing through the rotary electric motor 300 passes and a rivet insertion hole 13 for inserting a rivet are formed therethrough.
  • a shaft insertion hole 10 for inserting a shaft such as a compression mechanism portion is formed through the center of the inner circumference side of the magnet insertion hole 3.
  • the rotor 100 is fixed to a shaft such as a compression mechanism portion that is passed through the shaft insertion hole 10 by shrink fitting or the like.
  • each end plate 5 is formed with a shaft insertion hole through which the shaft is inserted, an air hole portion through which the discharge gas passes through the rotary electric motor 300, and a rivet insertion hole through which the rivet is inserted.
  • the rotor 100 is formed by providing end plates 5 on both end faces of the rotor core 1 to which the permanent magnets 4 are mounted, and inserting the rivets into a plurality of rivet insertion holes and caulking and fixing.
  • the rotor 100 of the rotary motor 300 rotates by receiving a rotational force from a rotating magnetic field generated by the stator 200 to which the current is supplied. Along with this, a shaft (not shown) inserted through the shaft insertion hole 10 of the rotor 100 is rotationally driven.
  • the size of the magnet insertion hole 3 is designed to be larger than the dimension of the permanent magnet 4. This is for avoiding generation of thermal stress due to temperature change, in addition to facilitating insertion of the permanent magnet 4 into the magnet insertion hole 3.
  • the permanent magnet 4 moves inside the magnet insertion hole 3 during rotation of the rotor, so that the rotation balance of the rotor fluctuates and noise is generated during the operation of the rotary electric motor 300. .
  • the magnetic steel sheet 2 a arranged at the top of the plurality of electromagnetic steel sheets 2 constituting the rotor core 1 is provided in the magnet insertion hole 3.
  • a pressing portion 6 is formed in contact with the end portion of the inserted permanent magnet 4 to press the permanent magnet downward in the rotation axis direction P.
  • the pressing portion 6 includes an inclined surface portion 60 inclined toward the permanent magnet 4 from the opening edge facing in the circumferential direction of the magnet insertion hole 3, and magnet insertion from the end of the inclined surface portion 60. It is formed in a pair of left and right spring plates that project toward the center of the hole 3 and have a flat surface portion 61 that contacts the end of the permanent magnet 4 and presses downward in the rotational axis direction P. That is, the pressing part 6 formed in the shape of a spring plate can strongly press the permanent magnet 4 downward in the rotation axis direction P by using the elastic force. Since the pressed permanent magnet 4 is strongly pressed against the lower end plate 5 at the lower end surface, the position in the rotation axis direction P is firmly fixed. Further, the permanent magnet 4 is strongly pressed and sandwiched between the pressing portion 6 and the end plate 5, and the movement in the direction orthogonal to the rotational axis direction P is also restricted by the action of each frictional force.
  • the pressing part 6 is not limited to the structure formed in the uppermost electromagnetic steel plate 2a shown in FIG.
  • the pressing portion 6 may be formed on the electromagnetic steel sheet 2 (for example, the electromagnetic steel sheet 2 located in the second or third stage from the top) disposed in the upper part of the plurality of electromagnetic steel sheets 2 constituting the rotor core 1. .
  • the pressing portion 6 is the electromagnetic steel plate 2 arranged at the lowest stage among the plurality of electromagnetic steel plates 2 constituting the rotor core 1 and is inserted into the magnet insertion hole 3.
  • the permanent magnet 4 may be in contact with the end of the permanent magnet 4 and pressed upward in the rotational axis direction P. That is, since the upper end surface of the permanent magnet 4 pressed upward by the pressing portion 6 is strongly pressed against the upper end plate 5, the position in the rotation axis direction P is firmly fixed.
  • the pressing part 6 is formed on the electromagnetic steel sheet 2 (for example, the electromagnetic steel sheet 2 located in the second or third stage from the bottom) disposed in the lower part of the plurality of electromagnetic steel sheets 2 constituting the rotor core 1. Also good.
  • the rotor 100 is in contact with the end of the permanent magnet 4 inserted into the magnet insertion hole 3 on the electromagnetic steel plate 2 disposed on one end side (upper part) of the rotor core 1. Since the pressing portion 6 that presses the permanent magnet 4 in the rotation axis direction P is formed, the position of the permanent magnet 4 can be firmly fixed by the pressing portion 6, and noise generated during operation of the rotary motor 300. Can be reduced.
  • the pressing portion 6 is inclined from the opposed opening edge of the magnet insertion hole 3 toward the permanent magnet 4 and the magnet insertion hole 3 from the end of the inclined surface portion 60.
  • the permanent magnet 4 can be strongly pressed in the rotation axis direction P. Therefore, the rotor 100 according to the first embodiment can firmly fix the position of the permanent magnet 4 in the rotation axis direction P, and can more effectively reduce noise generated during the operation of the rotary electric motor 300. .
  • the pressing portion 6 may be formed on a plurality of (three in the illustrated example) electromagnetic steel sheets 2 including the uppermost stage of the rotor core 1.
  • the rotor can strongly press the permanent magnet 4 downward in the rotation axis direction P by the elastic force of the plurality of pressing portions 6.
  • the rotor 100 shown in FIG. 6 has a configuration in which the permanent magnet 4 is divided into a plurality of parts in order to reduce magnet eddy current loss.
  • the permanent magnet 4 shown in FIG. 6 is composed of two pieces that are divided in the circumferential direction of the rotor core 1.
  • the pair of left and right pressing portions 6 are configured to press each of the two permanent magnets 4 and 4 into which the respective pressing portions are divided downward in the rotation axis direction P. Therefore, even if the rotor 100 is composed of the two permanent magnets 4 divided to reduce the magnet eddy current loss, the pair of pressing portions 6 press the permanent magnet 4 to be strong. Since it can fix, the noise which generate
  • each permanent magnet 4 inserted into the magnet insertion hole 3 repel each other inside the magnet insertion hole 3 and are pressed against the inner surface of the magnet insertion hole 3. Therefore, each permanent magnet 4 is not fixed obliquely with respect to the rotation axis direction P.
  • FIG. 7 is a plan view showing the rotor according to the second embodiment with the end plates omitted.
  • FIG. 8 is a longitudinal sectional view showing a magnet insertion hole portion of the rotor according to the second embodiment, with the end plate omitted.
  • symbol is attached
  • the rotor of the second embodiment includes four permanent magnets 4 divided in the circumferential direction of the rotor core 1 in order to reduce magnet eddy current loss.
  • the electromagnetic steel sheet 2 arranged at the uppermost stage of the rotor core 1 is formed with a pressing portion 7 that contacts the end of the permanent magnet 4 and presses the permanent magnet 4 downward in the rotation axis direction P.
  • the pressing portion 7 is formed in a zigzag shape from one opening edge facing in the circumferential direction of the magnet insertion hole 3 toward the other opening edge as seen from the rotation axis direction P.
  • the cross-sectional shape is also formed in a zigzag shape.
  • the pressing portion 7 has four protrusions 70 protruding toward the permanent magnet 4. Each protrusion 70 of the pressing portion 7 abuts against an end portion of each corresponding permanent magnet 4 to press the permanent magnet 4 downward in the rotation axis direction P.
  • the pressing portion 7 can be secured in length by being formed in a zigzag shape when viewed from the rotation axis direction P, and the permanent magnet 4 can be strongly pushed in the rotation axis direction P.
  • the permanent magnet 4 is constituted by a plurality (for example, three or more) divided in the circumferential direction of the rotor core 1 in order to reduce magnet eddy current loss.
  • the plurality of permanent magnets 4 can be pressed and firmly fixed by the pressing portion 7, and noise generated during operation of the rotary electric motor 300 can be reduced.
  • the plurality of permanent magnets 4 inserted into the magnet insertion hole 3 repel each other inside the magnet insertion hole 3, and the permanent magnets 4 at the left and right ends are pressed against the inner surface of the magnet insertion hole 3. Therefore, each permanent magnet 4 is not fixed obliquely with respect to the rotation axis direction P.
  • the zigzag-shaped pressing portion 7 may have a configuration in which a single permanent magnet 4 is pressed downward in the rotation axis direction P with two or more protrusions 70, for example.
  • the zigzag-shaped pressing part 7 is not limited to the structure which has the four protrusions 70 shown in figure.
  • the zigzag-shaped pressing portion 7 may be configured to have a number of protrusions corresponding to the number of divided permanent magnets 4.
  • the zigzag-shaped pressing portion 7 is formed on the electromagnetic steel sheet 2 (for example, the electromagnetic steel sheet 2 located in the second or third stage from the top) disposed in the upper part of the plurality of electromagnetic steel sheets 2 constituting the rotor core 1.
  • the formed structure may be sufficient.
  • the zigzag pressing portion 7 may be formed on the electromagnetic steel plate 2 disposed in the lower portion of the plurality of electromagnetic steel plates 2 constituting the rotor core 1.
  • FIG. 9 is a longitudinal sectional view showing a magnet insertion hole portion of the rotor according to the third embodiment, with the end plate omitted.
  • symbol is attached
  • the pressing portion 8 is formed in a pair of flat plates protruding from the opening edge facing in the circumferential direction of the magnet insertion hole 3 toward the center of the magnet insertion hole 3. It is a configuration.
  • the flat pressing portion 8 can strongly press the permanent magnet 4 downward in the rotation axis direction P using the elastic force of the electromagnetic steel plate 2.
  • FIG. 10 is a plan view showing a rotor provided with a magnet stopper for positioning the permanent magnet inserted into the magnet insertion hole, with the end plate omitted.
  • FIG. 11 is an enlarged plan view showing the magnet insertion portion shown in FIG.
  • FIG. 12 is an enlarged plan view showing a magnet insertion portion of the rotor which is pressed by flatly pressing the magnet stopper.
  • the embedded magnet type rotor has a configuration in which a magnet stopper 9 is provided for positioning and fixing the position of the permanent magnet 4 inserted in each magnet insertion hole 3.
  • the flat pressing portion 8 can be formed by flat-pressing the magnet stopper 9 in advance as shown in FIG.
  • FIG. 13 is a longitudinal sectional view showing a magnet insertion hole portion in which the end plate is omitted, which is a modification of the rotor according to the third embodiment.
  • the flat pressing portion 8 may have a configuration formed on a plurality of (three in the illustrated example) electromagnetic steel plates 2 disposed on the top of the rotor core 1. In this case, the flat pressing portion 8 can strongly press the permanent magnet 4 downward in the rotation axis direction P by its elastic force.
  • the rotor according to the third embodiment is in contact with the end of the permanent magnet 4 inserted into the magnet insertion hole 3 on the electromagnetic steel plate 2 arranged on the upper portion of the rotor core 1 so that the permanent magnet 4 is rotated. Since the flat pressing portion 8 that presses in the direction P is formed, the position of the permanent magnet 4 can be firmly fixed by the pressing portion 8 and noise generated during operation of the rotary electric motor 300 can be reduced. Can do.
  • the rotor according to the third embodiment is configured by a pair of flat plates in which the pressing portion 8 protrudes from the opening edge facing the magnet insertion hole 3 toward the center of the magnet insertion hole 3. 9 can be formed by flat-pressing, and the pressing portion 8 can be easily molded and the manufacturing cost can be reduced.
  • the rotor according to the third embodiment has a pair of presses even when the permanent magnet 4 is constituted by two pieces divided in the circumferential direction of the rotor core 1 in order to reduce magnet eddy current loss.
  • Each pressing portion of the portion 8 can press the divided permanent magnets 4 in the rotation axis direction P.
  • the flat pressing part 8 is not limited to the structure formed in the electromagnetic steel plate 2 of the 2nd step
  • the flat pressing portion 8 is an electromagnetic steel plate 2 disposed in the lower part of the plurality of electromagnetic steel plates 2 constituting the rotor core 1, and is provided at the end of the permanent magnet 4 inserted into the magnet insertion hole 3.
  • a configuration in which the permanent magnet 4 is pressed upward in the rotation axis direction P may be used.
  • the present invention has been described above based on the embodiment, the present invention is not limited to the configuration of the embodiment described above.
  • the pressing portion 6 may be configured to be formed on the opening edge facing in the radial direction of the magnet insertion hole 3.
  • the scope of the present invention also includes the scope of various changes, applications, and uses made by those skilled in the art as needed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

La présente invention concerne un rotor pourvu : d'un noyau de rotor formé par empilement d'une pluralité de plaques d'acier dans la direction axiale d'un arbre tournant, et doté d'une pluralité de trous d'insertion d'aimant qui pénètrent dans la direction axiale de l'arbre tournant ; d'aimants permanents insérés dans les trous d'insertion d'aimant ; et d'une plaque d'extrémité disposée sur une surface d'extrémité dans la direction axiale de l'arbre tournant du noyau de rotor. Une partie de pression qui presse les aimants permanents dans la direction axiale de l'arbre tournant tout en étant en contact avec une partie d'extrémité des aimants permanents insérés dans les trous d'insertion d'aimant permanent est formée sur la plaque d'acier disposée sur un côté de section d'extrémité ou sur l'autre côté de section d'extrémité du noyau de rotor.
PCT/JP2017/009235 2017-03-08 2017-03-08 Rotor et machine électrique tournante équipée dudit rotor WO2018163319A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2017/009235 WO2018163319A1 (fr) 2017-03-08 2017-03-08 Rotor et machine électrique tournante équipée dudit rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/009235 WO2018163319A1 (fr) 2017-03-08 2017-03-08 Rotor et machine électrique tournante équipée dudit rotor

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109660099A (zh) * 2018-12-10 2019-04-19 陕西法士特齿轮有限责任公司 一种混合励磁同步电机
JPWO2020249994A1 (fr) * 2019-06-14 2020-12-17
US20220216755A1 (en) * 2021-01-07 2022-07-07 Toyota Jidosha Kabushiki Kaisha Rotor of rotary electric machine
US20230140075A1 (en) * 2021-11-03 2023-05-04 Nidec Motor Corporation Retention cap for permanent magnet rotor
WO2023127756A1 (fr) * 2021-12-28 2023-07-06 ニデック株式会社 Rotor, machine dynamoélectrique et procédé de fabrication de rotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003070195A (ja) * 2001-08-28 2003-03-07 Mitsuba Corp 回転電機のマグネット固定構造
JP2013034335A (ja) * 2011-08-03 2013-02-14 Tamagawa Seiki Co Ltd 磁石埋め込み型モータ用ロータ構造
JP2016019300A (ja) * 2014-07-04 2016-02-01 株式会社三井ハイテック 回転子積層鉄心及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003070195A (ja) * 2001-08-28 2003-03-07 Mitsuba Corp 回転電機のマグネット固定構造
JP2013034335A (ja) * 2011-08-03 2013-02-14 Tamagawa Seiki Co Ltd 磁石埋め込み型モータ用ロータ構造
JP2016019300A (ja) * 2014-07-04 2016-02-01 株式会社三井ハイテック 回転子積層鉄心及びその製造方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109660099A (zh) * 2018-12-10 2019-04-19 陕西法士特齿轮有限责任公司 一种混合励磁同步电机
JPWO2020249994A1 (fr) * 2019-06-14 2020-12-17
WO2020249994A1 (fr) * 2019-06-14 2020-12-17 日産自動車株式会社 Rotor et procédé de fabrication de rotor
JP7188588B2 (ja) 2019-06-14 2022-12-13 日産自動車株式会社 ロータ、及び、ロータの製造方法
US20220216755A1 (en) * 2021-01-07 2022-07-07 Toyota Jidosha Kabushiki Kaisha Rotor of rotary electric machine
JP2022106421A (ja) * 2021-01-07 2022-07-20 トヨタ自動車株式会社 回転電機のロータ
JP7327418B2 (ja) 2021-01-07 2023-08-16 トヨタ自動車株式会社 回転電機のロータ
US11824405B2 (en) 2021-01-07 2023-11-21 Toyota Jidosha Kabushiki Kaisha Rotor of rotary electric machine
US20230140075A1 (en) * 2021-11-03 2023-05-04 Nidec Motor Corporation Retention cap for permanent magnet rotor
WO2023127756A1 (fr) * 2021-12-28 2023-07-06 ニデック株式会社 Rotor, machine dynamoélectrique et procédé de fabrication de rotor

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