WO2020203292A1 - Rotor et moteur électrique comprenant ledit rotor - Google Patents

Rotor et moteur électrique comprenant ledit rotor Download PDF

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Publication number
WO2020203292A1
WO2020203292A1 PCT/JP2020/011973 JP2020011973W WO2020203292A1 WO 2020203292 A1 WO2020203292 A1 WO 2020203292A1 JP 2020011973 W JP2020011973 W JP 2020011973W WO 2020203292 A1 WO2020203292 A1 WO 2020203292A1
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WO
WIPO (PCT)
Prior art keywords
peripheral side
iron core
rotor
side iron
inner peripheral
Prior art date
Application number
PCT/JP2020/011973
Other languages
English (en)
Japanese (ja)
Inventor
田邉　洋一
智則 小嶋
忠雄 松岡
雅樹 山田
庸佑 松井
颯馬 守屋
パーオブトン パッタラワディー
村上　正憲
哲也 鶴田
Original Assignee
株式会社富士通ゼネラル
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 株式会社富士通ゼネラル filed Critical 株式会社富士通ゼネラル
Priority to CN202080019683.9A priority Critical patent/CN113544941B/zh
Publication of WO2020203292A1 publication Critical patent/WO2020203292A1/fr

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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
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Definitions

  • the present invention relates to a rotor having an insulating member and an electric motor provided with the rotor.
  • an inner rotor type permanent magnet electric motor in which a rotor having a permanent magnet is rotatably arranged inside a stator that generates a rotating magnetic field is known.
  • This permanent magnet electric motor is used, for example, for rotationally driving a blower fan mounted on an air conditioner.
  • the rotor includes, for example, an annular permanent magnet, an annular outer peripheral iron core located on the inner diameter side of the permanent magnet, an annular inner peripheral iron core located on the inner diameter side of the outer peripheral iron core, and an outer peripheral iron core and inner core. It includes an insulating member located between the peripheral cores and a shaft fixed to a through hole penetrating in the direction of the central axis of the inner core.
  • the insulating member of such a rotor is a connecting portion that connects the outer peripheral side iron core and the inner peripheral side iron core, and is formed of, for example, a resin filled between the outer peripheral side iron core and the inner peripheral side iron core.
  • the common mode voltage is divided as the potential on the inner ring side (shaft side) of the bearing by the capacitance distribution between the stator winding and the shaft and the capacitance between the shaft and the inverter drive circuit board. To. Then, the common mode voltage is divided as a potential on the outer ring side (bracket side) of the bearing by the capacitance between the winding of the stator and the bracket and the capacitance between the bracket and the circuit board for driving the inverter. To. The potential difference between the inner ring side and the outer ring side of this bearing is the shaft voltage.
  • an object of the present invention is to provide a rotor having an insulating member capable of preventing thermal cracking while maintaining strength, and an electric motor provided with the rotor.
  • one aspect of the rotor of the present invention includes an outer peripheral side iron core, an inner peripheral side iron core, and a connecting portion for connecting the outer peripheral side iron core and the inner peripheral side iron core.
  • the connecting portion is formed of an insulating resin.
  • a plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction are provided on both end faces in the axial direction of the connecting portion.
  • the depth of the second recess is formed shallower than the depth of the first recess.
  • One aspect of the electric motor of the present invention includes a stator fixed to the outer shell of the motor and a rotor arranged on the inner diameter side of the stator.
  • the rotor is made of an insulating resin, which is located between the annular outer peripheral side iron core to which the permanent magnet is fixed, the inner peripheral side iron core located on the inner diameter side of the outer peripheral side iron core, and the outer peripheral side iron core and the inner peripheral side iron core. It is provided with a formed connecting portion and a shaft that is connected to an iron core on the inner peripheral side and is rotatably supported by a bearing on the outer shell of the motor.
  • the rotor is provided with a plurality of first recesses arranged in an annular shape and a plurality of second recesses connecting the first recesses adjacent to each other in the circumferential direction on both end faces in the axial direction of the connecting portion. ..
  • the depth of the second recess is formed shallower than the depth of the first recess.
  • FIG. 6 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 6 is a cross-sectional view taken along the line BB of FIG.
  • FIG. 7 is a cross-sectional view taken along the line CC of FIG.
  • FIG. 7 is a sectional view taken along line DD of FIG.
  • It is a perspective view of the rotor, the shaft and the 2nd bearing of the permanent magnet electric motor which concerns on this invention.
  • It is sectional drawing which shows the permanent magnet electric motor which concerns on this invention.
  • It is a perspective view which shows how the permanent magnet electric motor of FIG. 1 or FIG. 12 is attached to the outdoor unit of an air conditioner.
  • FIG. 1 is a partially enlarged view on the left side of FIG.
  • the permanent magnet electric motor 1 is, for example, a brushless DC motor.
  • the electric motor 1 is used to rotationally drive the blower fan mounted on the outdoor unit 10 of the air conditioner as shown in FIG.
  • the outdoor unit 10 of the air conditioner includes, for example, a bottom plate 102 screwed to the base 101 of the outdoor unit 10, an upper plate 103 fixed to the upper part of the outdoor unit 10, a pedestal 104 to which the electric motor 1 is attached, and a bottom plate. It is provided with two columns 105 to which the 102, the upper plate 103, and the pedestal 104 are fixed.
  • the electric motor 1 is screwed to the central portion of the pedestal 104.
  • the permanent magnet electric motor 1 in the present embodiment includes a stator 2, a rotor 3, and a motor outer shell 6.
  • the stator 2 includes a stator core 21 having a cylindrical yoke portion and a plurality of teeth portions extending from the yoke portion to the inner diameter side, and a winding 23 wound around the teeth portion via an insulator 22. ..
  • the stator 2 is covered with a motor outer shell 6 made of resin, except for the inner peripheral surface of the stator core 21.
  • the rotor 3 is rotatably arranged with a predetermined gap on the inner peripheral side of the stator core 21 of the stator 2.
  • the rotor 3 is a surface magnet type in which permanent magnets 31 are arranged in an annular shape on the outer peripheral surface facing the stator core 21.
  • the permanent magnet 31 is fixed to the outer peripheral surface of the outer peripheral side iron core 32, which will be described later.
  • the shaft 35 is connected to the inner peripheral side iron core 34, and the power generated by the rotor 2 is transmitted to the load (blower fan) via the shaft 35 to rotationally drive the blower fan. .. Further, the shaft 35 is supported by the first bearing 41 and the second bearing 42, the first bearing 41 is supported by the first bracket 51, and the second bearing 42 is supported by the second bracket 52, whereby the rotor 3 is supported. Is rotatably supported.
  • the first bearing 41 supports one end side (output side) of the shaft 35 of the rotor 3.
  • the second bearing 42 supports the other end side (counter-output side) of the shaft 35 of the rotor 3.
  • first bearing 41 and the second bearing 42 for example, ball bearings are used.
  • the first bracket 51 is made of metal (steel plate, aluminum, etc.) and is arranged on one end side of the motor outer shell 6, that is, on the output side of the shaft 35.
  • the first bracket 51 has a first bearing accommodating portion 511 for accommodating the first bearing 41, and a flange portion 512 extending around from the open end of the first bearing accommodating portion 511.
  • the first bearing accommodating portion 511 is formed in a cylindrical shape having a bottom portion provided with a through hole for passing the shaft 35, and the flange portion 512 of the first bracket 51 is insert-molded at the time of molding the motor outer shell 6. , It is integrated with the motor outer shell 6.
  • the outer ring of the first bearing 41 is press-fitted into the inner surface of the first bearing accommodating portion 511, and the output side of the shaft 35 supported by the inner ring of the first bearing 41 is formed in the center of the bottom portion of the first bearing accommodating portion 511. It protrudes to the outside from the through hole.
  • the second bracket 52 is made of metal (steel plate, aluminum, etc.) and is fixed to the other end side of the motor outer shell 6, that is, the counter-output side of the shaft 35.
  • the second bracket 52 includes a disc-shaped bracket main body 521, an outer edge portion 520 that closes an end portion of the motor outer shell 6 on the opposite output side, and a second bearing accommodating portion 522 for accommodating the second bearing 42. And have.
  • the outer edge 520 of the second bracket 52 is screwed to the end of the motor outer shell 6 on the opposite output side.
  • the second bearing accommodating portion 522 is formed as a hole having a circular bottom surface recessed from the motor outer shell 6 side (output side) in the central portion of the bracket main body portion 521.
  • the first bearing 41 is housed in the first bearing accommodating portion 511 provided in the first bracket 51, and the second bearing 42 is accommodated in the second bearing accommodating portion 522 provided in the second bracket 52.
  • the first bearing 41 and the first bearing accommodating portion 511, and the second bearing 42 and the second bearing accommodating portion 522 are electrically conductive, respectively.
  • the second bracket 52 integrally includes a heat sink between the second bearing accommodating portion 522 and the outer edge portion 520 in the radial direction. As a result, the space of the electric motor 1 can be saved.
  • the second bracket is provided with heat radiation fins 523 erected outward on the opposite output side of the shaft 35 as a heat sink, and is a circuit board 72 for controlling the electric motor 1 via a heat transfer member 71 (particularly, The heat from the electronic component 721) mounted on the circuit board 72 is efficiently dissipated by the heat radiating fins 523.
  • the rotor 3 has a permanent magnet 31, an outer peripheral side iron core 32, an insulating member (connecting portion) 33, and an inner peripheral side iron core 34 from the outer diameter side to the inner diameter side. And the shaft 35 is provided.
  • the permanent magnet 31 is annular with a plurality of (for example, 8 or 10) permanent magnet pieces 311 so that the north and south poles appear alternately at equal intervals in the circumferential direction. Is formed in.
  • a plastic magnet formed in an annular shape by solidifying the magnet powder with a resin may be used.
  • the outer peripheral side iron core 32 is formed in an annular shape as shown in FIG. 2, and is located on the inner diameter side of the permanent magnet 31 as shown in FIGS. 11 and 12.
  • the outer peripheral side iron core 32 is recessed from the inner peripheral surface (see FIG. 2) to the outer diameter side in order to secure the function of preventing rotation with the insulating member 33 described later, and the direction of the axis O of the rotor 3 (hereinafter, hereinafter, It is provided with a plurality of (for example, five in the circumferential direction) inner peripheral side recesses 321 extending in the axial direction. That is, the inner peripheral side recess 321 is a key groove that prevents rotation of the insulating member 33 (a groove that prevents slipping between the insulating member 33.
  • the outer peripheral side iron core 32 is provided with a plurality of outer peripheral side protrusions 322 (for example, 10 in the circumferential direction) protruding from the outer peripheral surface to the outer diameter side in order to position the permanent magnet 31.
  • the plurality of inner peripheral side recesses 321 extend in the axial direction from the end face of the insulating member 33 and are arranged at equal intervals in the circumferential direction.
  • two inner peripheral side recesses 321 are arranged so as to extend from both ends of the outer peripheral side iron core 32 in the axial direction.
  • the outer peripheral side iron core 32 has a partition wall 323 (retaining portion) between the inner peripheral side recesses 321 adjacent to each other in the axial direction, and the partition wall 323 causes the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
  • the plurality of outer peripheral protrusions 322 extend in the axial direction and are arranged at equal intervals in the circumferential direction. Further, each outer peripheral side protrusion 322 is arranged so as to extend from one end to the other end of the outer peripheral side iron core 32 in the axial direction.
  • the inner peripheral side iron core 34 is formed in an annular shape as shown in FIG. 3, and is located on the inner diameter side of the outer peripheral side iron core 32 as shown in FIGS. 5 to 10.
  • the inner peripheral side iron core 34 is recessed from the outer peripheral surface (see FIG. 3) toward the inner diameter side and extends in the axial direction (for example, in the circumferential direction) in order to secure the function of preventing rotation with the insulating member 33 described later. 6) outer peripheral side recesses 341 are provided. That is, the outer peripheral side recess 341 functions as a key groove for preventing rotation of the insulating member 33.
  • the plurality of outer peripheral side recesses 341 extend in the axial direction and are arranged at equal intervals in the circumferential direction.
  • the outer peripheral side recess 341 is partitioned by a partition wall 344 (retaining portion) arranged at the center in the axial direction. Therefore, two outer peripheral side recesses 341 are arranged so as to extend from both end portions of the inner peripheral side iron core 34.
  • the inner peripheral side iron core 34 has a partition wall 344 between the outer peripheral side recesses 341 adjacent to each other in the axial direction, and the partition wall 344 (removal portion) of the insulating member 33 (connecting portion) (in both axial directions). ) Can be prevented from coming off.
  • the inner peripheral side iron core 34 may be provided with a plurality of through holes 342 for lightening the weight between the through hole 343 and the outer peripheral surface of the inner peripheral side iron core 34. These plurality of through holes 342 are arranged at equal intervals in the circumferential direction so that the shape of the inner peripheral side iron core 34 in which the through holes 342 are formed becomes a spoke shape when viewed from the axial direction.
  • the insulating member 33 is made of a dielectric resin such as PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), and is located between the outer peripheral side iron core 32 and the inner peripheral side iron core 34.
  • the insulating member 33 is integrally formed with the outer peripheral side iron core 32 and the inner peripheral side iron core 34 by insert molding in which a resin is filled between the outer peripheral side iron core 32 and the inner peripheral side iron core 34.
  • the insulating member 33 has a small capacitance between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 (a part of the capacitance between the winding 23 of the stator 2 and the shaft 35).
  • the insulating member 33 includes (plural) outer peripheral side convex portions 338 on the outer peripheral surface that engage with the inner peripheral side concave portion 321 of the outer peripheral side iron core 32 described above. Further, the insulating member 33 includes (plural) inner peripheral side convex portions 339 that engage with the outer peripheral side concave portions 341 of the inner peripheral side iron core 34 on the inner peripheral surface.
  • an engaging portion (inner peripheral side recess 321 and outer peripheral side recess 321) provided between the outer peripheral side iron core 32 and the insulating member (connecting portion) 33 to prevent rotation between the outer peripheral side iron core 32 and the insulating member 33.
  • the side convex portion 338) is used as the first concave-convex engaging portion, and is provided between the insulating member 33 and the inner peripheral side iron core 34 to prevent rotation between the insulating member 33 and the inner peripheral side iron core 34.
  • the joint portion (inner peripheral side convex portion 339 and outer peripheral side concave portion 341) is referred to as a second uneven engagement portion.
  • the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed with recesses of the concave-convex engaging portion (the first concave-convex engaging portion and the second concave-convex engaging portion) to insulate.
  • An example is shown in which a convex portion of the concave-convex engaging portion is formed on the member (connecting portion) 33.
  • the concave portion and the convex portion of the concave-convex engaging portion are arranged on the rotor core (32, 34) or the insulating member 33 may be reversed from the above-mentioned case.
  • the convex portion of the concave-convex engaging portion may be provided on the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the concave portion of the concave-convex engaging portion may be provided on the insulating member 33.
  • the first concave-convex engaging portions 321 and 338 and the second concave-convex engaging portions 339 and 341 have inner peripheral recesses 321 adjacent to each other in the axial direction. Since the partition wall 323 (retaining portion) is formed between the two, and the partition wall 344 (removing portion) is formed between the outer peripheral side recesses 341 adjacent to each other in the axial direction, the outer peripheral side iron core 32 and the inner peripheral side iron core 34 are formed.
  • the insulating member 33 can be prevented from coming off. Therefore, as described above, the first concavo-convex engaging portion 321 and 338 and the second concavo-convex engaging portion 339 and 341 can have both a rotation preventing function and a retaining function by engaging each of the unevenness.
  • the concave-convex engaging portion that functions as a key (a mechanical element that fastens the rotating body to the shaft) when the rotor 3 rotates.
  • the position where the concave-convex engaging portion (key) is arranged is the position of the radius r [m] from the central axis O on the shaft for transmitting the torque having a size of T [Nm], the shape of the concave-convex engaging portion.
  • the shear stress ⁇ 1 acting between the members on the outer diameter side is always larger (that is, ⁇ 1 ⁇ 2 always holds). Therefore, by increasing the number of the second concave-convex engaging portions 339 and 341 in the circumferential direction to be larger than the number of the first concave-convex engaging portions 321 and 338 in the circumferential direction, they are provided between the members on the inner diameter side.
  • the shear stress acting on the individual first uneven engaging portions 321 and 338 can be reduced, and the detent of the insulating member 33 can be further strengthened.
  • the shaft 35 is passed through a through hole 343 provided in the inner peripheral side iron core 34, and is fixed to the inner peripheral side iron core 34 by press fitting or caulking.
  • the neutral point potential of the winding does not become zero, and the common mode voltage is used. A voltage called is generated. Due to this common mode voltage, a potential difference (shaft voltage) is generated between the outer ring and the inner ring of the first bearing 41 and the second bearing 42 due to the stray capacitance inside the permanent magnet motor 1. When this shaft voltage reaches the dielectric breakdown voltage of the oil film inside the bearing, a current flows inside the bearing and causes electrolytic corrosion inside the bearing.
  • the insulating member 33 is formed in a cylindrical shape as shown in FIGS. 4 to 10, and in order to reduce the capacitance of the rotor 3, one end in the axial direction is in the first axial direction.
  • a hole 331 is formed, and a second axial hole 332 for reducing the capacitance of the rotor 3 is similarly formed at the other end in the axial direction.
  • a plurality (for example, 10) of these first axial holes 331 and the second axial holes 332 are formed at equal intervals in the circumferential direction.
  • a partition wall 334 is uniformly formed between each of the plurality of first axial holes 331 and between each of the plurality of second axial holes 332, and the first axial holes adjacent to each other in the circumferential direction.
  • the 331s and the second axial holes 332 adjacent to each other in the circumferential direction are separated from each other.
  • the plan view and the bottom view of the rotor 3 are the same.
  • the partition wall 334 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational motion is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. Can be done.
  • the first axial hole 331 and the second axial hole 332 face each other in the axial direction, and the center of the insulating member 33 in the axial direction (the first axis facing the axial direction).
  • a wall portion 333 is provided so as to divide the holes so that the depths of the holes are the same.
  • the wall portion 333 enhances the mechanical strength of the insulating member 33 (connecting portion), and when the rotor 3 rotates, the power of the rotational movement is sufficiently transmitted between the inner peripheral side iron core 34 and the outer peripheral side iron core 32. be able to.
  • a bottom portion 335c of the first axial direction hole 331 is formed on one end side of the wall portion 333, and a bottom portion of the second axial direction hole 332 is formed on the other end side of the wall portion 333.
  • 335c is formed.
  • a side wall 335a and a side wall 335b are formed along the axial direction from the bottom 335c of each of the first axial hole 331 and the second axial hole 332.
  • the first axial hole 331 and the second axial hole 332 have a structure having a depth in the direction along the axial direction from both end faces by forming the wall portion 333. Further, as shown in FIGS. 6 to 9, the first axial hole 331 and the second axial hole 332 are formed so that the end face shape seen from the axial direction is an arc shape along the circumferential direction, respectively. Are formed at equal intervals (for example, 10 in the circumferential direction).
  • the radius of the rotor 3 is small, so that the first axial direction is formed.
  • the radial length (width) R of the hole 331 and the second axial hole 332 is also limited to be small.
  • the insulating member 33 in the present embodiment is formed by integrally molding a dielectric resin such as PBT or PET together with the outer peripheral side iron core 32 and the inner peripheral side iron core 34, the first axial direction hole 331 and the first Considering the draft of the mold at the time of molding the biaxial hole 332, the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 cannot be increased.
  • the axial thickness of the partition wall 323 (retaining portion) of the outer peripheral side iron core 32 and the axial thickness of the partition wall 344 (removing portion) of the inner peripheral side iron core 34 are set to the wall portion 333. Is approximately equal to the (axial) thickness of.
  • the first axial hole 331 and the second axial hole 332 have a circumferential end face shape when viewed from the axial direction, as shown in FIGS. 6 to 9. It is formed in an arc shape along. That is, by making the length (width) R in the radial direction of the first axial hole 331 and the second axial hole 332 constant in the circumferential direction, the size of the hole can be increased in a limited space. Moreover, the capacitance of the rotor 3 can be reduced.
  • the size and shape of the first axial hole 331 and the second axial hole 332 are determined in consideration of both the reduction of the capacitance of the rotor 3 and the securing of mechanical strength.
  • the coefficient of linear expansion of resin is 10 times or more larger than the coefficient of linear expansion of metal. Therefore, in the resin insulating member 33, the amount of expansion when the temperature rises and the amount of contraction when the temperature drops are larger than those of the metal outer peripheral side iron core 32 and the inner peripheral side iron core 34.
  • the side walls 335a and 335b of the insulating member 33 are thin in the radial direction and thick in the axial direction. Therefore, the amount of expansion and contraction of the side walls 335a and 335b of the insulating member 33 is larger in the axial direction than in the radial direction.
  • the amount of expansion and contraction of the wall portion 333 and the partition wall 334 of the insulating member 33 are divided into a radial component and an axial component, but the radial expansion and contraction are performed on the outer peripheral side iron core 32 and the inner peripheral side. Since it is regulated by the iron core 34, the amount of expansion and contraction in the axial direction tends to be larger than the amount of expansion and contraction in the radial direction.
  • the insulating member 33 sandwiched between the outer peripheral side iron core 32 and the inner peripheral side iron core 34 shown in FIGS. 7 and 8 is displaced in the axial direction (change in position) due to expansion or contraction. It varies depending on where it was in the axial direction before it contracted. That is, since the insulating member 33 expands or contracts in both axial directions with the central portion in the axial direction as a boundary, the displacement becomes larger as the insulating member 33 is farther from the central portion in the axial direction. For example, the central portion in the axial direction (near the wall portion 333) has almost no axial displacement before and after expansion. On the other hand, the axial end (near the end 335d) has a large axial displacement before and after expansion. Since the insulating member 33 has a small radial width and is restricted from expanding and contracting in the radial direction, the displacement in the radial direction due to the expansion and contraction is almost the same regardless of the axial position. Absent.
  • thermal stress is likely to be concentrated in a portion where expansion or contraction in the radial direction is regulated by the outer peripheral side iron core 32 and the inner peripheral side iron core 34. Therefore, in the present embodiment, the thermal stress is concentrated on the wall portion 333 and the partition wall 334 of the insulating member 33.
  • the amount of expansion in the axial direction tends to be larger than that in the radial direction.
  • Thermal stress is particularly concentrated in places where expansion is regulated or where the amount of displacement is large.
  • the thermal stress is concentrated on the portion where the wall portion 333 and the side walls 335a and 335b shown in FIG. 7 intersect, but the first axial direction hole 331 and the second axial direction hole 332 Since the (first recess) is provided, the force can be released to the first recess side, and the thermal stress can be relaxed.
  • the thermal stress is concentrated on the axial ends of the side walls 335a and 335b, but the above-mentioned first recess is provided, so that the first recess side The force can be released and the thermal stress can be relieved.
  • the expansion in the radial direction is restricted to the outer peripheral side iron core 32 and the inner peripheral side iron core 34, and the displacement amount due to the expansion near the axial end portion 335d becomes particularly large. .. Therefore, due to the influence of the expansion of the insulating member 33, the vicinity of the axial end portion 335d of the insulating member 33 that covers the inner and outer edges of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is particularly liable to crack.
  • the insulating member 33 is provided between the first axial holes 331 and between the second axial holes 332, which are arranged in an annular shape, as shown in FIGS. 6 and 8.
  • a third axial hole 336 is formed at one end in the axial direction, and a fourth axial hole 337 is similarly formed at the other end in the axial direction at a position between the two.
  • the third axial hole 336 and the fourth axial hole 337 are the same as the first axial hole 331 and the second axial hole 332 (first recesses 331 and 332). It is formed on the circumference and is arranged in an annular shape.
  • third axial hole 336 and fourth axial hole 337 are provided at equal intervals in the circumferential direction, similarly to the first axial hole 331 and the second axial hole 332 (for example,). 10) are formed. Further, each of the third axial hole 336 and the fourth axial hole 337 is arranged so as to overlap the partition wall 334 described above in the axial direction. Further, as shown in FIGS. 6 to 9, the third axial hole 336 and the fourth axial hole 337 are formed so that the end face shape when viewed from the axial direction is an arc shape along the circumferential direction.
  • the third axial hole 336 and the fourth axial hole 337 are continuous with the first axial hole 331 and the second axial hole 332, so that the insulating member 33 has an annular recess on both end surfaces in the axial direction.
  • a groove is formed. That is, when the first axial hole 331 and the second axial hole 332 are the first recesses, and the third axial hole 336 and the fourth axial hole 337 are the second recesses, the insulating member (connecting portion).
  • An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33.
  • the bottom portion (position of the axial end portion of the partition wall 334) of the second recess (third axial hole 336, fourth axial hole 337) is a rotor core (outer peripheral side iron core 32 and inner peripheral side). It has been confirmed that the concentration of thermal stress in the insulating member 33 is suppressed when the iron core 34) is formed so as to be closer to the central portion in the axial direction than the end face in the axial direction. Based on this, in the present embodiment, the depth of the third axial hole 336 and the fourth axial hole 337 is formed so as to be 5.5 mm from the axial end face of the insulating member 33. On the other hand, the depth of the first axial hole 331 and the second axial hole 332 is formed so as to be 16.5 mm from the axial end face of the insulating member 33.
  • the depths of the first axial hole 331 and the second axial hole 332 are M [mm]
  • the third axial hole is M [mm]
  • the depth of the 336 and the fourth axial hole 337 is S [mm]
  • the axial length (core product thickness) of the outer peripheral side iron core 32 and the inner peripheral side iron core 34 is L [mm].
  • the axial thickness (central wall thickness) of the wall portion 333 is C [mm].
  • the region where the insulating member 33 has a large axial length is reduced, and the total volume of the insulating member 33 is reduced.
  • the amount of expansion and contraction of the insulating member 33 in the axial direction can be reduced.
  • the second recesses 336 and 337 are provided, the force applied to the vicinity of the axial end portion 335d can be released to the second recess side, the thermal stress is relaxed, and the thermal stress is concentrated. Can be suppressed. Therefore, it is possible to suppress a decrease in durability due to the concentration of thermal stress of the insulating member 33, and it is possible to suppress the occurrence of thermal cracks and cracks and extend the life.
  • the plurality of third axial holes 336 are the plurality of first axial holes 331 (first recesses) arranged in an annular shape. It is arranged between the holes and is formed so as to connect the first axial holes 331 adjacent to each other in the circumferential direction.
  • the plurality of fourth axial holes 337 are arranged between the plurality of second axial holes 332 (first recesses) arranged in an annular shape and have a circumference. It is formed so as to connect the second axial holes 332 adjacent to each other in the direction. As a result, the concentration of thermal stress can be suppressed.
  • the depths of the third axial hole 336 and the fourth axial hole 337 are formed to be smaller (shallow) than the depths of the first axial hole 331 and the second axial hole 332.
  • a partition wall 334 that partitions the second axial holes 332 between the first axial holes 331 adjacent to each other in the circumferential direction and between the second axial holes 332 adjacent to each other in the circumferential direction is provided. It can be formed, and the strength of the insulating member 33 (connecting portion) can be increased.
  • the insulating member (connecting portion).
  • An annular concave groove portions (331, 336, and 332, 337) formed in an annular shape are provided on both end faces in the axial direction of the 33.
  • the side walls 335a and 335b can expand toward the annular concave groove in the radial direction, so that the influence of thermal stress is further mitigated and the insulating member 33 is thermally cracked. Can be prevented.
  • the insulating member 33 thermally expands due to heat generated by the winding 23 of the stator 2 in the usage environment and the driving state of the permanent magnet electric motor 1 has been described. Not only that, but also around the bottom of the first axial hole 331 and the second axial hole 332 and around the end of the insulating member 33 during heat shrinkage when the temperature drops depending on the usage environment and driving state of the permanent magnet motor 1.
  • the concentration of thermal stress can be relaxed.
  • the insulating member 33 is provided with the first recesses 331 and 332 and the second recesses 336 and 337, and the thickness (and resin) of the insulating member 33 in the axial direction is provided. The volume) can be reduced, the stresses during thermal expansion and contraction can be reduced, and thermal cracking of the insulating member 33 can be prevented.
  • the insulating member 33 is arranged on the rotor 3, and the insulating member 33 has the first axial hole 331 and the second axial direction.
  • the concentration of thermal stress generated in the insulating member 33 which is a problem when the rotor 3 having a small diameter is manufactured, is alleviated. Can be made to.
  • the permanent magnet electric motor 1 provided with the rotor 3 can also be miniaturized.
  • the capacitance and durability of at least one of the first axial hole 331 and the second axial hole 332, or at least one of the third axial hole 336 and the fourth axial hole 337 may be attached.
  • the end face shapes of the first axial hole 331 and the second axial hole 332 and the third axial hole 336 and the fourth axial hole 337 when viewed from the axial direction are circular.
  • the shape of each axial hole is not limited to this.
  • the number of the first axial hole 331 and the second axial hole 332 and the number of each of the third axial hole 336 and the fourth axial hole 337 are not limited to 10, but can be any number. can do.
  • the first axial hole 331 and the second axial hole 332 are formed symmetrically with respect to the wall portion 333, but the present invention is not limited to this, and the first axial direction is not limited to this.
  • the hole 331 and the second axial hole 332 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333.
  • the third axial hole 336 and the fourth axial hole 337 may be formed in an asymmetrical shape (for example, C-shaped when viewed from the axial direction) with respect to the wall portion 333.
  • the present invention is applied to the surface magnet type rotor 3 in which the permanent magnet 31 is arranged on the outer peripheral surface of the outer peripheral side iron core 32 has been described, but the present invention is not limited thereto.
  • the present invention can also be applied to an embedded magnet type rotor in which a slot extending in the axial direction is formed at a chord position with respect to the outer peripheral surface of the outer peripheral side iron core 32 and a permanent magnet is arranged in this slot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un rotor doté d'un élément d'isolation (partie de liaison) qui peut empêcher la fissuration thermique tout en conservant la résistance. La solution selon l'invention porte sur un rotor 3 qui comprend un noyau de fer côté périphérique externe 32, un noyau de fer côté périphérique interne 34 et un élément d'isolation (partie de liaison) 33 qui relie le noyau de fer côté périphérique externe et le noyau de fer côté périphérique interne et est constitué d'une résine d'isolation. Plusieurs premières parties d'évidement 331, 332 disposées selon une forme annulaire et plusieurs secondes parties d'évidement 336, 337 reliant les premières parties d'évidement 331, 332 adjacentes entre elles dans la direction circonférentielle sont ménagées dans les deux surfaces d'extrémité de l'élément d'isolation 33 dans une direction d'axe O. Les profondeurs des secondes parties d'évidement 336, 337 sont formées de sorte à être moins profondes que les profondeurs des premières parties d'évidement 331, 332.
PCT/JP2020/011973 2019-03-29 2020-03-18 Rotor et moteur électrique comprenant ledit rotor WO2020203292A1 (fr)

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CN202080019683.9A CN113544941B (zh) 2019-03-29 2020-03-18 转子以及具备转子的电动机

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JP2019-066952 2019-03-29
JP2019066952A JP7331418B2 (ja) 2019-03-29 2019-03-29 回転子および回転子を備えた電動機

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WO2024198154A1 (fr) * 2023-03-28 2024-10-03 克瑞科技(东莞)有限公司 Moteur de pompe à traction pour équipement de culture physique

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WO2018011979A1 (fr) * 2016-07-15 2018-01-18 三菱電機株式会社 Rotor à pôles conséquents, moteur électrique, climatiseur et procédé de fabrication dudit rotor
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JP3674523B2 (ja) * 2001-03-15 2005-07-20 三菱電機株式会社 回転電機の固定子及びその製造方法
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JP2007215301A (ja) * 2006-02-08 2007-08-23 Toyota Motor Corp ロータの製造方法
JP2008220154A (ja) * 2007-02-06 2008-09-18 Honda Motor Co Ltd 磁気機械
JP2016034176A (ja) * 2014-07-31 2016-03-10 日立アプライアンス株式会社 回転子
WO2018011979A1 (fr) * 2016-07-15 2018-01-18 三菱電機株式会社 Rotor à pôles conséquents, moteur électrique, climatiseur et procédé de fabrication dudit rotor
JP2018023241A (ja) * 2016-08-05 2018-02-08 三菱電機株式会社 ロータおよび回転電機

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* Cited by examiner, † Cited by third party
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WO2024198154A1 (fr) * 2023-03-28 2024-10-03 克瑞科技(东莞)有限公司 Moteur de pompe à traction pour équipement de culture physique

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JP7331418B2 (ja) 2023-08-23
CN113544941A (zh) 2021-10-22
CN113544941B (zh) 2024-06-21

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