WO2016208031A1 - Moteur électrique et appareil de conditionnement d'air - Google Patents

Moteur électrique et appareil de conditionnement d'air Download PDF

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Publication number
WO2016208031A1
WO2016208031A1 PCT/JP2015/068338 JP2015068338W WO2016208031A1 WO 2016208031 A1 WO2016208031 A1 WO 2016208031A1 JP 2015068338 W JP2015068338 W JP 2015068338W WO 2016208031 A1 WO2016208031 A1 WO 2016208031A1
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WO
WIPO (PCT)
Prior art keywords
magnet
rotor
back yoke
electric motor
resin
Prior art date
Application number
PCT/JP2015/068338
Other languages
English (en)
Japanese (ja)
Inventor
石井　博幸
及川　智明
山本　峰雄
洋樹 麻生
隼一郎 尾屋
優人 浦辺
貴也 下川
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 JP2017524521A priority Critical patent/JP6328338B2/ja
Priority to PCT/JP2015/068338 priority patent/WO2016208031A1/fr
Priority to CN201590001135.8U priority patent/CN207490633U/zh
Publication of WO2016208031A1 publication Critical patent/WO2016208031A1/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
    • H02K1/27—Rotor cores with permanent magnets

Definitions

  • the present invention relates to an electric motor and an air conditioner equipped with the electric motor.
  • the rotor of the electric motor described in Patent Document 1 includes a two-layer rotor magnet having a back yoke as an inner layer and a resin magnet as an outer layer. That is, the rotor magnet described in Patent Document 1 is formed by molding an annular back yoke formed by molding a resin containing soft magnetic powder or ferrite powder, and a resin containing rare earth magnet powder. An annular resin magnet disposed on the outer peripheral surface of the yoke.
  • the rotor of the electric motor described in Patent Document 2 includes a single layer rotor magnet. That is, the rotor magnet described in Patent Document 2 is formed by molding a resin containing ferrite powder, and includes an annular resin magnet provided with grooves between magnetic poles.
  • Patent Document 1 since the electric motor described in Patent Document 1 is demagnetized at high temperatures between the magnetic poles of the resin magnet of the rare earth magnet, the output of the electric motor is limited. Conventionally, the magnetic characteristics of the resin magnet are improved by selecting a magnetic material, but in this case, the cost becomes high.
  • Patent Document 2 demagnetization is suppressed by providing a groove between the magnetic poles of the resin magnet.
  • the structure described in Patent Document 2 is applied to the rotor magnet having the two-layer structure described in Patent Document 1
  • the resin magnet is separated in the circumferential direction by the groove in order to further suppress demagnetization,
  • the resin magnet is detached from the outer peripheral surface of the back yoke, and it becomes difficult to mold the resin magnet on the outer peripheral surface of the back yoke.
  • the present invention has been made in view of the above, and includes a rotor magnet having a back yoke as a first annular layer as an inner layer and a resin magnet of a rare earth magnet as a second annular layer as an outer layer.
  • Another object of the present invention is to provide an electric motor in which demagnetization is suppressed and detachment of a resin magnet formed on the outer peripheral surface of the back yoke from the back yoke is suppressed.
  • an electric motor including a rotor having an annular rotor magnet, and the rotor magnet is coaxial with the rotor magnet.
  • the first annular layer is formed by using a resin including first and second end faces that are arranged in the axial direction and face each other in the axial direction of the rotor magnet, and that includes at least one of soft magnetic powder and ferrite powder And a plurality of first magnet pieces and a plurality of second magnet pieces disposed on the outer peripheral surface of the first annular layer and formed using a resin containing rare earth magnetic powder.
  • the first and second magnet pieces are alternately arranged on the outer peripheral surface of the first annular layer, and the first and second magnet pieces are arranged in the circumferential direction of the first annular layer.
  • the first magnet piece has a first magnetic pole
  • the second magnet piece has a second annular layer having a second magnetic pole different from the first magnetic pole
  • the rotor magnet The plurality of first magnet pieces and the plurality of first magnet pieces and the plurality of second magnet pieces are coaxially disposed on the first end face and integrally formed with the plurality of first magnet pieces and the plurality of second magnet pieces.
  • An annular connecting portion for connecting the second magnet pieces.
  • FIG. 3 is a longitudinal sectional view showing the configuration of the electric motor according to the first embodiment.
  • the perspective view which shows the structure of the stator of Embodiment 1.
  • FIG. The figure which shows the structure of the rotor of Embodiment 1.
  • FIG. The figure which shows the structure of the back yoke of Embodiment 1.
  • FIG. The perspective view which shows the structure of the back yoke of Embodiment 1.
  • FIG. The figure which shows the structure of the rotor magnet of Embodiment 1.
  • FIG. A flowchart showing a method of manufacturing a rotor according to the first embodiment
  • FIG. Enlarged view of part F in FIG.
  • the perspective view which shows the structure of the back yoke of Embodiment 2.
  • FIG. The figure which shows the structure of the rotor magnet of Embodiment 2.
  • FIG. Enlarged view of portion H in FIG.
  • the perspective view which shows the structure of the rotor magnet of Embodiment 2.
  • FIG. The perspective view which shows the structure of the rotor of Embodiment 2.
  • FIG. The figure which shows the structure of the air conditioner which concerns on Embodiment 3.
  • FIG. 1 is a longitudinal sectional view showing the configuration of the electric motor 1 according to the present embodiment
  • FIG. 2 is a perspective view showing the configuration of the stator 10.
  • An electric motor 1 according to the present embodiment includes a mold stator 2, a rotor 3 disposed inside the mold stator 2, bearings 5a and 5b assembled to a shaft 4 of the rotor 3, and a mold stator. 2, and a bracket 7 that closes the opening 6 of the mold stator 2.
  • the bearing 5 a is disposed on the load side of the electric motor 1 and is supported by the bracket 7.
  • the bearing 5 b is disposed on the opposite load side of the electric motor 1 and is supported by a support portion 9 that is a part of the resin portion 8 of the mold stator 2.
  • the load side is the tip side of the shaft 4 protruding from the mold stator 2.
  • the anti-load side is the opposite side to the load side.
  • the electric motor 1 is, for example, a brushless DC motor.
  • the mold stator 2 includes a stator 10 and a resin portion 8 that covers the stator 10.
  • the resin portion 8 is formed from a thermosetting resin that is an unsaturated polyester resin, for example.
  • the stator 10 includes a stator core 11, an insulating portion 12 assembled to the stator core 11, a coil 13 wound around the stator core 11 via the insulating portion 12, and an axial direction of the stator core 11.
  • the stator core 11 is configured by laminating a plurality of electromagnetic steel plates in the axial direction.
  • the thickness of the electromagnetic steel sheet is generally 0.1 mm to 0.7 mm.
  • the stator core 11 includes a plurality of teeth (not shown).
  • the plurality of teeth extend toward the inside in the radial direction of the stator core 11.
  • the insulating part 12 is formed from a thermoplastic resin, for example, polybutylene terephthalate.
  • the coil 13 is wound in a concentrated manner around a plurality of teeth (not shown) via the insulating portion 12.
  • the coil 13 may be distributedly wound.
  • a position detection element (not shown) for detecting the rotational position of the rotor 3 is mounted on the sensor substrate 14.
  • FIG. 3A and 3B are diagrams showing the configuration of the rotor, FIG. 3A is a side view from the load side of the rotor, FIG. 3B is a longitudinal sectional view of the rotor, and FIG. It is a side view from the non-load side of a child.
  • FIG. 3B is a cross-sectional view taken along the line AA in FIG.
  • the anti-load side is the sensor substrate 14 side.
  • the rotor 3 includes a rotor magnet 20, a position detection magnet 21 disposed at one end of the rotor magnet 20 in the axial direction, a shaft 4 passing through the rotor magnet 20 in the axial direction, and the rotor magnet 20.
  • the position detecting magnet 21 and the resin portion 22 for integrally forming the shaft 4 are provided.
  • a position detection element (not shown) mounted on the sensor substrate 14 detects the rotation position of the rotor 3 by detecting the magnetic pole of the position detection magnet 21.
  • the rotor magnet 20 has a two-layer structure, and the back yoke 23 that is a first annular layer is an inner layer, and the resin magnet 24 that is a second annular layer is an outer layer.
  • the rotor magnet 20 is annular, and the back yoke 23 and the resin magnet 24 are arranged coaxially with the rotor magnet 20.
  • the rotor magnet 20 has a plurality of magnetic poles in which N poles that are first magnetic poles and S poles that are different second magnetic poles are alternately arranged in the circumferential direction. Between the magnetic poles adjacent to each other in the circumferential direction is between the magnetic poles.
  • the number of magnetic poles of the rotor magnet 20 is eight. That is, the number of magnetic poles of the rotor 3 is 8, and the rotor 3 is magnetized so as to have 8 poles.
  • the resin part 22 includes an inner cylinder part 22a, an outer cylinder part 22c disposed outside the inner cylinder part 22a, and eight ribs 22b that connect the inner cylinder part 22a and the outer cylinder part 22c. .
  • the resin portion 22 is formed by molding a thermoplastic resin that is, for example, polybutylene terephthalate.
  • the shaft 4 passes through the inner cylinder portion 22a.
  • the eight ribs 22 b are arranged at equal intervals in the circumferential direction of the rotor 3, and extend radially about the axis of the shaft 4.
  • the number of ribs 22b is not limited to eight.
  • a hollow portion 25 is formed between adjacent ribs 22b.
  • the shaft 4 is formed with a knurl 4a.
  • the knurl 4a is in contact with the inner surface of the inner cylindrical portion 22a and functions as an anti-slip of the shaft 4.
  • FIG. 4A and 4B are diagrams showing the configuration of the back yoke 23, FIG. 4A is a side view from the load side of the back yoke 23, FIG. 4B is a longitudinal sectional view of the back yoke 23, and FIG. ) Is a side view of the back yoke 23 from the non-load side.
  • FIG. 4B is a cross-sectional view taken along the line BB in FIG.
  • FIG. 5 is a perspective view showing the configuration of the back yoke 23.
  • the back yoke 23 is formed using a thermoplastic resin containing soft magnetic powder or ferrite powder. Specifically, the back yoke 23 is formed by molding a thermoplastic resin containing soft magnetic powder or ferrite powder.
  • the soft magnetic powder is a powder of a soft magnetic material. A soft magnetic material generates a magnetic pole when a magnetic field is applied, and disappears when the magnetic field is removed, such as iron.
  • the thermoplastic resin is, for example, polyamide. It is also possible to use a non-thermoplastic resin for forming the back yoke 23.
  • the back yoke 23 may be formed using a thermoplastic resin including soft magnetic powder and ferrite powder. That is, the back yoke 23 can be formed using a thermoplastic resin containing at least one of soft magnetic powder and ferrite powder.
  • the back yoke 23 is annular. Further, the back yoke 23 has first and second end faces that face each other in the axial direction.
  • the axial direction is the axial direction of the rotor magnet 20.
  • the first and second end surfaces are end surfaces on the load side and the anti-load side, respectively.
  • the outer periphery of the back yoke 23 is formed in a wave shape, for example. Specifically, on the outer periphery of the back yoke 23, the concave portions 27a and the convex portions 27b are alternately arranged in the circumferential direction.
  • the recess 27a is disposed at the center of the magnetic pole in the circumferential direction.
  • the convex portion 27b is disposed between the magnetic poles in the circumferential direction.
  • the eight concave portions 28 are formed at equal intervals in the circumferential direction on the end surface of the back yoke 23 on the load side.
  • the recess 28 is disposed at the center of the magnetic pole in the circumferential direction.
  • the recess 28 is provided with a gate port (not shown) for injecting a thermoplastic resin as a material for the back yoke 23.
  • the depth of the recess 28 is set such that a gate processing trace (not shown) does not protrude from the load-side end face of the back yoke 23.
  • the inner circumferential surface of the back yoke 23 is provided with eight notches 29 at equal intervals in the circumferential direction.
  • the notch 29 is notched in a taper shape in the axial direction from the end surface on the load side of the back yoke 23.
  • the notch 29 is disposed between the magnetic poles in the circumferential direction.
  • the notch 29 is used to fit the convex portion of the mold when the rotor magnet 20 is molded, and to ensure circumferential positioning and coaxiality.
  • the eight pedestals 30 are formed at equal intervals in the circumferential direction on the end surface of the back yoke 23 on the side opposite to the load.
  • the pedestal 30 is disposed between the magnetic poles in the circumferential direction.
  • a position detection magnet 21 is installed on the pedestal 30.
  • the pedestal 30 includes a protrusion 30 a that suppresses the radial displacement of the position detection magnet 21.
  • FIG. 6A and 6B are diagrams showing the configuration of the rotor magnet 20, FIG. 6A is a side view from the load side of the rotor magnet 20, and FIG. 6B is a longitudinal sectional view of the rotor magnet 20.
  • 6 (c) is a side view of the rotor magnet 20 from the non-load side.
  • FIG. 6B is a cross-sectional view taken along the line CC in FIG.
  • FIG. 7 is a perspective view showing the configuration of the rotor magnet 20.
  • 8A and 8B are diagrams showing the configuration of the resin magnet 24.
  • FIG. 8A is a side view from the load side of the resin magnet 24, FIG.
  • FIG. 8B is a longitudinal sectional view of the resin magnet 24, and FIG. ) Is a side view of the resin magnet 24 from the non-load side.
  • FIG. 8B is a DD cross-sectional view in FIG.
  • FIG. 9 is a perspective view showing the configuration of the resin magnet 24.
  • the resin magnet 24 is disposed on the outer peripheral surface of the back yoke 23, and is disposed on the load side end surface of the back yoke 23 and eight magnet pieces 24 a that are spaced apart from each other in the circumferential direction of the back yoke 23. , And an annular connecting portion 24b for connecting the eight magnet pieces 24a.
  • the eight magnet pieces 24a are composed of four magnet pieces 24aN and four magnet pieces 24aS.
  • the magnet piece 24aN has an N pole
  • the magnet piece 24aS has an S pole.
  • the four magnet pieces 24aN and the four magnet pieces 24aS are alternately arranged in the circumferential direction on the outer peripheral surface of the back yoke 23 and are separated from each other in the circumferential direction.
  • Resin magnet 24 is formed using a thermoplastic resin containing rare earth magnet powder.
  • the resin magnet 24 is formed by molding a thermoplastic resin containing rare earth magnet powder. That is, the eight magnet pieces 24a and the connecting portion 24b for connecting them are integrally formed on the back yoke 23 using a thermoplastic resin containing rare earth magnet powder as a material.
  • the thermoplastic resin is, for example, polyamide. It is also possible to use a non-thermoplastic resin for molding the resin magnet 24.
  • the eight magnet pieces 24a have the same shape.
  • the magnet piece 24a has an arc shape in cross section.
  • the transverse section is a section perpendicular to the axis of the back yoke 23.
  • the resin magnet 24 is coaxial with the back yoke 23.
  • the back yoke 23 is coaxial with the shaft 4, and the axis of the back yoke 23 is equal to the rotation axis of the rotor 3.
  • the axial length of the magnet piece 24 a is equal to the axial length of the back yoke 23.
  • the eight magnet pieces 24a are arranged on the outer peripheral surface of the back yoke 23 in the circumferential direction, and are arranged in an annular shape as a whole.
  • slits 31 extending over the entire length of the back yoke 23 in the axial direction are provided between the magnet pieces 24a adjacent to each other in the circumferential direction. That is, the magnet pieces 24 a adjacent to each other in the circumferential direction are separated from each other by the slits 31.
  • the outer peripheral surface of the back yoke 23 is exposed from the slit 31.
  • the slit 31 becomes a groove portion by the outer peripheral surface of the back yoke 23. Since the eight magnet pieces 24 a constitute the eight magnetic poles of the rotor 3, the slit 31 is disposed between the magnetic poles of the rotor 3.
  • a portion of the resin magnet 24 that is disposed on the outer peripheral surface of the back yoke 23 is spaced between the magnetic poles. That is, the magnet pieces 24a adjacent to each other in the circumferential direction are separated between the magnetic poles.
  • the outer periphery of the back yoke 23 is formed in a wave shape, and the concave portions 27a arranged at the center of the magnetic pole and the convex portions 27b arranged between the magnetic poles are alternately arranged. Since the magnet piece 24a is formed on the outer peripheral surface of the back yoke 23, the magnet piece 24a is thickest at the center of the magnetic pole according to the shape of the outer periphery of the back yoke 23. Specifically, the outer shape of the magnet piece 24a is arcuate, whereas the inner shape of the magnet piece 24a is inwardly convex.
  • the connecting portion 24b is coaxial with the back yoke 23, and has an annular shape, for example.
  • the outer diameter of the connecting portion 24 b is equal to the outer diameter of the convex portion 27 b of the back yoke 23. That is, the outer diameter of the connecting portion 24 b is equal to the maximum outer diameter of the back yoke 23.
  • the inner shape of the magnet piece 24a is inwardly convex according to the shape of the concave portion 27a of the back yoke 23, and the region inside the outer periphery of the connecting portion 24b on the load side end face of the magnet piece 24a is connected. It overlaps with the end surface of the portion 24b on the side opposite the load.
  • the connecting portion 24b is connected to each of the eight magnet pieces 24a in the axial direction at the magnetic pole center. Moreover, the magnet piece 24a adjacent to the circumferential direction is connected between the magnetic poles via the connection part 24b.
  • the outer peripheral surface of the connecting portion 24b is flush with the outer peripheral surface of the back yoke 23 and the axial direction of the back yoke 23 between the magnet pieces 24a adjacent in the circumferential direction.
  • the slit 31 is separated from the magnet pieces 24a adjacent in the circumferential direction over the entire length in the axial direction without being blocked by the connecting portion 24b at the position of the end surface on the load side of the back yoke 23.
  • FIG. 10 is a flowchart showing a method for manufacturing the rotor 3 according to the present embodiment.
  • the manufacturing method of the rotor 3 includes the following steps. Step 1: The shaft 4 is processed. At the same time, the position detection magnet 21 is molded, and the position detection magnet 21 is demagnetized after the molding. Step 2: The back yoke 23 is molded, and the back yoke 23 is demagnetized after the molding. Step 3: The resin magnet 24 is molded, and the rotor magnet 20 is manufactured. After manufacture, the rotor magnet 20 is demagnetized. Step 4: The rotor magnet 20, the position detection magnet 21 and the shaft 4 are set in a mold. Step 5: The rotor 3 is formed by integral molding with a thermoplastic resin. Step 6: The rotor 3 is magnetized. Step 7: Assemble the bearings 5a and 5b to the rotor 3.
  • the resin magnet 24 is composed of the eight magnet pieces 24 a that are spaced apart from each other in the circumferential direction on the outer peripheral surface of the back yoke 23, and one end surface of the back yoke 23. And an annular connecting portion 24b that is arranged on the top and integrally connects the eight magnet pieces 24a.
  • the outer peripheral surface of the connecting portion 24b is flush with the outer peripheral surface of the back yoke 23 and the axial direction of the back yoke 23 in each of the circumferentially adjacent magnet pieces 24a.
  • the slit 31 formed between the magnet pieces 24 a is not blocked by the connecting portion 24 b at the position of one end surface of the back yoke 23.
  • the magnetic poles of rare earth magnets are demagnetized at a high temperature.
  • the magnetic poles of the resin magnet 24 as in the present embodiment, there is no rare earth magnet between the magnetic poles, so demagnetization can be suppressed. It becomes possible. Thereby, the fall of the output of the electric motor 1 is suppressed and the performance of the electric motor 1 can be improved.
  • the amount of material used for the resin magnet 24 is reduced, the cost can be reduced.
  • the connecting portion 24b restricts the movement of the eight magnet pieces 24a to the outer side in the radial direction of the back yoke 23. That is, the eight magnet pieces 24a are held on the outer peripheral surface of the back yoke 23 by the connecting portion 24b, and the detachment from the back yoke 23 is suppressed.
  • the connecting portion 24 b is a holding portion that holds the eight magnet pieces 24 a on the outer peripheral surface of the back yoke 23. In this case, the holding portion constitutes a part of the resin magnet 24.
  • the resin magnet 24 can be integrally formed with the back yoke 23 while suppressing demagnetization.
  • the integral molding of the resin magnet 24 does not increase the number of manufacturing steps, leading to cost reduction.
  • the outer periphery of the back yoke 23 is formed in a wave shape, and the concave portions 27a arranged at the center of the magnetic pole and the convex portions 27b arranged between the magnetic poles are alternately arranged.
  • the magnetic flux generated from the rotor 3 approaches a sine wave, the harmonic component of the induced voltage of the coil 13 is reduced, and the cogging torque is reduced.
  • the adjacent magnet pieces 24a can be connected by the connecting portion 24b while penetrating the slit 31 in the axial direction.
  • the outer periphery of the back yoke 23 is not limited to a wave shape, and may have other shapes.
  • the inner shape of the magnet piece 24a is arcuate, but by setting the outer diameter of the connecting portion 24b to be larger than the outer diameter of the back yoke 23, the connecting portion The demagnetization can be suppressed while the eight magnet pieces 24a are integrally connected by 24b.
  • the slit 31 is blocked by the connecting portion 24b at one end in the axial direction of the back yoke 23, and the slit 31 does not penetrate in the axial direction.
  • demagnetization in the connection part 24b can also be suppressed by making the outer diameter of the connection part 24b smaller than the outer diameter of the magnet piece 24a.
  • the number of magnetic poles is, for example, eight, but is not limited to this, and may be any even number. In this case, the number of magnet pieces 24a is the same as the number of magnetic poles.
  • the connecting portion 24b is disposed on the load-side end surface of the back yoke 23.
  • the present invention is not limited to this, and the connecting portion 24b is disposed on the anti-load-side end surface of the back yoke 23. You may make it do.
  • the pedestal 30 can be omitted from the back yoke 23, and the resin magnet 24 can be molded so that the connecting portion 24b is disposed on the end surface of the back yoke 23 on the side opposite to the load.
  • the connecting portion 24b can be used as a position detection magnet. Thereby, since it is not necessary to shape
  • the slit 31 of the resin magnet 24 can be embedded with a resin constituting the resin portion 22 of the rotor 3. That is, when forming the rotor 3 by integrally forming the rotor magnet 20, the position detecting magnet 21 and the shaft 4 with resin, the slit 31 can be embedded with resin. Thereby, the movement of the resin magnet 24 in the axial direction is suppressed, and the reliability of fixing the resin magnet 24 to the back yoke 23 is improved.
  • Embodiment 2 the plurality of magnet pieces 24 a are connected by the connecting portion 24 b, and these magnet pieces 24 a are held on the outer peripheral surface of the back yoke 23. That is, the holding portion for holding the plurality of magnet pieces 24 a on the outer peripheral surface of the back yoke 23 is a connecting portion 24 b that is a part of the resin magnet 24.
  • the holding portion for holding the plurality of magnet pieces 24 a on the outer peripheral surface of the back yoke 23 is a connecting portion 24 b that is a part of the resin magnet 24.
  • the holding unit is realized as a part of the back yoke 23 will be described. In the following description, only differences from the first embodiment will be mainly described, and the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.
  • FIG. 11A and 11B are views showing the configuration of the back yoke 23, FIG. 11A is a side view from the load side of the back yoke 23, FIG. 11B is a longitudinal sectional view of the back yoke 23, and FIG. ) Is a side view of the back yoke 23 from the non-load side.
  • FIG. 11B is a cross-sectional view taken along the line EE in FIG.
  • FIG. 12 is an enlarged view of a portion F in FIG.
  • FIG. 13 is a perspective view showing the configuration of the back yoke 23.
  • the back yoke 23 is formed with eight protrusions 36 at equal intervals in the circumferential direction.
  • the protrusion 36 is disposed between the magnetic poles.
  • the number of protrusions 36 is the same as the number of magnetic poles.
  • the protruding portion 36 is a part of the back yoke 23 and is formed on the outer peripheral surface of the back yoke 23 integrally with the back yoke 23.
  • the protrusion 36 has, for example, a T-shaped cross section, and the width in the circumferential direction increases toward the outer side in the radial direction of the back yoke 23.
  • the transverse cross section is a cross section orthogonal to the axial direction of the back yoke 23.
  • the protrusion 36 is formed over the entire length of the back yoke 23 in the axial direction. That is, the protrusion 36 extends in the axial direction between the load-side and anti-load-side end surfaces of the back yoke 23.
  • the back yoke 23 is formed by molding a thermoplastic resin containing at least one of soft magnetic powder and ferrite powder.
  • FIG. 14A and 14B are diagrams showing the configuration of the rotor magnet 20.
  • FIG. 14A is a side view from the load side of the rotor magnet 20, and
  • FIG. 14B is a longitudinal sectional view of the rotor magnet 20.
  • FIG. 14 (c) is a side view of the rotor magnet 20 from the non-load side.
  • FIG. 14B is a GG cross-sectional view in FIG.
  • FIG. 15 is an enlarged view of a portion H in FIG.
  • FIG. 16 is a perspective view showing the configuration of the rotor magnet 20.
  • the resin magnet 24 includes eight magnet pieces 24c that are arranged on the outer peripheral surface of the back yoke 23 and are spaced apart from each other in the circumferential direction of the back yoke 23.
  • the eight magnet pieces 24c are formed by molding a thermoplastic resin containing rare earth magnet powder.
  • the eight magnet pieces 24c are composed of four magnet pieces 24cN and four magnet pieces 24cS.
  • the magnet piece 24cN has an N pole which is a first magnetic pole
  • the magnet piece 24cS has an S pole which is a second magnetic pole.
  • the four magnet pieces 24cN and the four magnet pieces 24cS are alternately arranged in the circumferential direction on the outer peripheral surface of the back yoke 23 and are separated from each other in the circumferential direction.
  • Protruding portions 36 are respectively disposed between the magnet pieces 24c adjacent in the circumferential direction.
  • the magnet pieces 24c are disposed between the protrusions 36 adjacent to each other in the circumferential direction. That is, the resin magnet 24 is spaced between the magnetic poles by disposing the protrusions 36 between the magnetic poles.
  • the shape of the end of the magnet piece 24c in the circumferential direction is a shape that fits with the protrusion 36. That is, the mutually opposing end portions of the magnet pieces 24 c that are adjacent to each other in the circumferential direction with the protrusion 36 interposed therebetween are fitted with the opposing surfaces of the protrusion 36. Specifically, the end portion in the circumferential direction of the magnet piece 24 c includes a fitting portion 24 d that fits with one side in the circumferential direction of the protruding portion 36.
  • the circumferential end of the magnet piece 24c is formed such that the radial length of the end is longer than the radial length of the protrusion 36.
  • the radial direction is the radial direction of the back yoke 23.
  • the circumferential end of the magnet piece 24c includes a non-fitting portion 24e connected to the fitting portion 24d outside the fitting portion 24d. Accordingly, the non-fitting portion 24e and the projection portion 36 facing each other in the circumferential direction of the magnet piece 24c sandwiching the projection portion 36 constitute a groove portion 31a extending over the entire length of the back yoke 23 in the axial direction.
  • a groove portion 31 a that extends over the entire length of the back yoke 23 in the axial direction is formed on the surface of the rotor magnet 20 by the end portions of the magnet pieces 24 c that are adjacent to each other in the circumferential direction across the protrusion portion 36 and the protrusion portion 36. Is done.
  • the number of magnetic poles of the rotor 3 is eight as in the first embodiment, but the number of magnetic poles is not limited to eight as described in the first embodiment.
  • Other configurations of the present embodiment are the same as those of the first embodiment.
  • the resin magnet 24 includes eight magnet pieces 24 c that are spaced apart from each other in the circumferential direction of the back yoke 23 on the outer peripheral surface of the back yoke 23 and constitute the magnetic poles of the rotor 3. Further, the eight magnet pieces 24 c are spaced apart from each other in the circumferential direction by the eight protrusions 36 disposed between the magnetic poles, and are held on the outer peripheral surface of the back yoke 23 by the eight protrusions 36. Yes.
  • the magnetic poles of rare earth magnets are demagnetized at a high temperature.
  • the magnetic poles of the resin magnet 24 as in the present embodiment, there is no rare earth magnet between the magnetic poles, so demagnetization can be suppressed. It becomes possible. Thereby, the fall of the output of the electric motor 1 is suppressed and the performance of the electric motor 1 can be improved.
  • the amount of material used for the resin magnet 24 is reduced, the cost can be reduced.
  • the eight protrusions 36 restrict the movement of the eight magnet pieces 24c outward in the radial direction of the back yoke 23. That is, the eight magnet pieces 24 c are held on the outer peripheral surface of the back yoke 23 by the eight protrusions 36, and detachment from the back yoke 23 is suppressed.
  • the eight protrusions 36 are holding parts that hold the eight magnet pieces 24 c on the outer peripheral surface of the back yoke 23. In this case, the holding portion constitutes a part of the back yoke 23.
  • the resin magnet 24 can be integrally formed with the back yoke 23 while suppressing demagnetization.
  • the integral molding of the resin magnet 24 does not increase the number of manufacturing steps, leading to cost reduction.
  • the protrusion 36 has a T shape, for example, but the shape of the protrusion 36 is not limited to this. That is, the shape of the protrusion 36 may be any shape that restricts the movement of the eight magnet pieces 24c outward in the radial direction of the back yoke 23.
  • the protrusion 36 may have a cross-sectional wave shape or a cross-sectional zigzag shape as a fitting surface with the circumferential end of the magnet piece 24c.
  • the protrusion 36 may have a tapered shape in which the circumferential width increases toward the outside in the radial direction.
  • the protrusion 36 may have a portion where the circumferential width increases toward the outside in the radial direction in at least a part of the radial direction.
  • the back yoke 23 is formed by molding a thermoplastic resin containing ferrite powder, the protrusions 36 containing ferrite are disposed between the magnetic poles, and the magnetic force between the magnetic poles of the rotor 3 is reduced. This improves the efficiency of the electric motor 1. In addition, since ferrite is difficult to demagnetize at high temperatures, the effect of suppressing demagnetization at high temperatures is also improved.
  • FIG. 17 is a perspective view showing the configuration of the rotor 3.
  • the rotor 3 has a rotor magnet 20, a position detection magnet 21 disposed at one end of the rotor magnet 20 in the axial direction, and the rotor magnet 20 penetrating in the axial direction of the rotor magnet 20.
  • the resin portion 22 that integrally molds the shaft 4 and the groove portion 31a are embedded in the resin of the resin portion 22. Thereby, the movement of the resin magnet 24 in the axial direction is suppressed, and the reliability of fixing the resin magnet 24 to the back yoke 23 is improved.
  • the structure which does not embed the groove part 31a with resin is also possible. Or the structure which does not provide the groove part 31a is also possible.
  • FIG. FIG. 18 is a diagram showing a configuration of the air conditioner 300 according to the present embodiment.
  • the air conditioner 300 includes an indoor unit 310 and an outdoor unit 320 connected to the indoor unit 310.
  • the outdoor unit 320 includes a blower 330.
  • blower 330 the electric motor of the first or second embodiment is used. Thereby, the performance of the air conditioner 300 is improved and the cost is also reduced.
  • the electric motor of Embodiment 1 or 2 can also be used for a blower (not shown) in the indoor unit 310.
  • the electric motor of the first or second embodiment can be mounted on an electric device other than the air conditioner 300, and in this case, the same effect as that of the present embodiment can be obtained.
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

Landscapes

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

Abstract

Moteur électrique 1 pourvu d'un rotor 3 comprenant un aimant 20 de rotor. L'aimant 20 de rotor est pourvu : d'une culasse arrière circulaire 23 qui est formée par le moulage d'une résine comprenant une poudre de ferrite ou une poudre magnétique souple ; d'aimants de résine 24 qui sont formés par le moulage d'une résine comprenant une poudre magnétique de terres rares, qui sont alignés sur la circonférence extérieure de la culasse arrière 23, avec un espace entre chaque aimant de résine dans la direction circonférentielle de la culasse arrière 23, et qui comportent une pluralité de pièces d'aimant 24a qui forment les pôles magnétiques du rotor 3 ; et d'une section de liaison 24b qui fait partie de l'aimant de résine 24, et est un support qui maintient la pluralité de pièces d'aimant 24a sur la circonférence extérieure de la culasse arrière 23.
PCT/JP2015/068338 2015-06-25 2015-06-25 Moteur électrique et appareil de conditionnement d'air WO2016208031A1 (fr)

Priority Applications (3)

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JP2017524521A JP6328338B2 (ja) 2015-06-25 2015-06-25 電動機および空気調和機
PCT/JP2015/068338 WO2016208031A1 (fr) 2015-06-25 2015-06-25 Moteur électrique et appareil de conditionnement d'air
CN201590001135.8U CN207490633U (zh) 2015-06-25 2015-06-25 电动机以及空调机

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PCT/JP2015/068338 WO2016208031A1 (fr) 2015-06-25 2015-06-25 Moteur électrique et appareil de conditionnement d'air

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JPWO2018147052A1 (ja) * 2017-02-10 2019-12-12 ミネベアミツミ株式会社 モータ用ロータ、モータ及びモータ用ロータの製造方法
JP2020054089A (ja) * 2018-09-26 2020-04-02 日亜化学工業株式会社 複合部材
EP4036405A1 (fr) * 2021-01-28 2022-08-03 Max Co., Ltd. Moteur et compresseur d'air

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EP2597753A2 (fr) * 2011-11-25 2013-05-29 Sisme S.p.A. Procédé perfectionné de revêtement d'un rotor d'un moteur électrique à aimant permanent utilisé dans une pompe d'appareil ménager avec de la matière plastique et rotor ainsi obtenu
JP2013233035A (ja) * 2012-04-27 2013-11-14 Mitsubishi Electric Corp 電動機の回転子、電動機、空気調和機、および電動機の回転子の製造方法

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JP2004088855A (ja) * 2002-08-23 2004-03-18 Mitsubishi Electric Corp Ｄｃモータの回転子及びｄｃモータ
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EP4036405A1 (fr) * 2021-01-28 2022-08-03 Max Co., Ltd. Moteur et compresseur d'air
US11965499B2 (en) 2021-01-28 2024-04-23 Max Co., Ltd. Motor and air compressor

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JPWO2016208031A1 (ja) 2017-09-21
CN207490633U (zh) 2018-06-12

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