WO2022249238A1 - Moteur électrique à rotor interne et ventilateur - Google Patents

Moteur électrique à rotor interne et ventilateur Download PDF

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Publication number
WO2022249238A1
WO2022249238A1 PCT/JP2021/019608 JP2021019608W WO2022249238A1 WO 2022249238 A1 WO2022249238 A1 WO 2022249238A1 JP 2021019608 W JP2021019608 W JP 2021019608W WO 2022249238 A1 WO2022249238 A1 WO 2022249238A1
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WO
WIPO (PCT)
Prior art keywords
core
back portion
electric motor
notch
inner rotor
Prior art date
Application number
PCT/JP2021/019608
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English (en)
Japanese (ja)
Inventor
達也 山下
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 JP2023523722A priority Critical patent/JPWO2022249238A1/ja
Priority to PCT/JP2021/019608 priority patent/WO2022249238A1/fr
Publication of WO2022249238A1 publication Critical patent/WO2022249238A1/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

Definitions

  • the present disclosure relates to inner rotor electric motors and blowers.
  • the rotor In the inner rotor type electric motor, the rotor is arranged inside the cylindrical stator.
  • the stator core has a tubular core-back portion and a plurality of tooth portions protruding from an inner peripheral surface of the core-back portion and arranged in a circumferential direction.
  • An insulator is assembled to the teeth to form a winding frame, and a winding is wound around the winding frame.
  • Patent Document 1 a plurality of fitting recesses are formed in the inner wall of an outer ring yoke portion as a core back portion, and a plurality of magnetic pole pieces as tooth portions are press-fitted into the plurality of fitting recesses of the outer ring yoke portion to form a plurality of magnetic pole pieces. The piece is fitted to the outer ring yoke portion.
  • the press-fitting of the magnetic pole piece may deform the outer ring yoke portion, degrading the outer diameter and cylindricity. Further, if the thickness of the outer ring yoke portion is increased, there is a possibility that seizure will occur in the fitting recess due to frictional heat and wear during press fitting. If seizure occurs, the position of the magnetic pole piece will be misaligned, and not only will the inner diameter accuracy of the integrated stator deteriorate, but the magnetic pole piece cannot be press-fitted to the bottom surface of the outer ring yoke, which can lead to manufacturing defects. be.
  • the present disclosure has been made in view of the above, and aims to obtain an inexpensive and highly efficient inner rotor type electric motor by integrating the tooth portion with the core back portion with high precision by press fitting.
  • an inner rotor type electric motor has a cylindrical core in which a plurality of recesses are arranged at intervals on the inner peripheral side and a plurality of electromagnetic steel sheets are laminated.
  • a stator core having a back portion and a plurality of radially arranged tooth portions in which a plurality of magnetic steel sheets are laminated and pressed into a plurality of concave portions of the core back portion, protruding from an inner peripheral surface of the core back portion. and a rotor arranged inside the stator core.
  • a notch is provided on at least one side of each of the plurality of recesses of the core back portion.
  • FIG. 1 is an exploded perspective view showing the appearance of an inner rotor type electric motor according to a first embodiment
  • FIG. 4 is a cross-sectional view showing a state in which the tooth portions according to the first embodiment are radially arranged
  • FIG. 1 is a first explanatory diagram for explaining various dimensions of the core-back portion according to the first embodiment
  • FIG. 2 is a second explanatory diagram for explaining various dimensions of the core-back portion according to the first embodiment
  • FIG. 11 is a partially enlarged view showing a first example of the lamination state of electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a second example of the laminated state of the electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a third example of the laminated state of the electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a fourth example of the lamination state of the electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a first example of the lamination state of electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a second example of
  • FIG. 11 is a partially enlarged view showing a fifth example of the laminated state of the electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • FIG. 11 is a partially enlarged view showing a sixth example of the laminated state of the electromagnetic steel sheets in the core-back portion of the inner rotor type electric motor according to the second embodiment;
  • 1 is a front view of an air blower provided with an inner rotor type electric motor according to Embodiment 1.
  • FIG. 1 is an exploded perspective view showing the appearance of an inner rotor type electric motor 100 according to the first embodiment.
  • a rotor 2 is arranged inside a cylindrical stator 1 .
  • the rotor 2 is provided with a shaft portion 23 extending along the central axis (not shown) of the stator 1 .
  • the shaft portion 23 is rotatably supported by two bearings 3a and 3b.
  • the bearing 3a is supported by the shell 4.
  • the bearing 3b is supported by the shell 5.
  • the outer shell 4 and the outer shell 5 constitute a casing for housing the stator 1, rotor 2, and bearings 3a and 3b inside.
  • the stator 1 includes a stator core 6, windings (coils) 7, and insulators 8.
  • the insulator 8 electrically insulates the stator core 6 and the windings 7 .
  • FIG. 2 is a cross-sectional view showing the stator core 6 according to the first embodiment. 2 cuts the stator core 6 perpendicularly to the central axis of the stator 1.
  • FIG. The stator core 6 includes a cylindrical core-back portion 9 and a plurality of tooth portions 10 protruding from the inner peripheral surface of the core-back portion 9 and arranged radially.
  • the core-back portion 9 and the tooth portion 10 are formed by laminating a plurality of electromagnetic steel plates along the axial direction.
  • the stator core 6 is, for example, 2-phase 4-pole and 16 slots.
  • the plurality of teeth 10 are covered with an insulator 8, on which a winding 7 is wound.
  • FIG. 3 is a cross-sectional view showing a state in which the tooth portions 10 according to Embodiment 1 are arranged radially.
  • FIG. 4 is a cross-sectional view showing the core back portion 9 according to the first embodiment.
  • FIG. 5 is a partially enlarged cross-sectional view of the core back portion 9 according to the first embodiment.
  • the core back portion 9 and the tooth portion 10 are formed separately.
  • a plurality of recesses 11 into which root portions of the tooth portions 10 are fitted are formed on the inner peripheral surface of the core back portion 9 .
  • a plurality of teeth 10 are arranged radially.
  • the tooth portion 10 and the concave portion 11 of the core back portion 9 are fitted by press-fitting in order to ensure the inner diameter accuracy when they are integrated. Therefore, there is a possibility that the outer shape of the core-back portion 9 will be deformed due to the press-fitting of the tooth portion 10, and the outer diameter dimension and cylindricity will be deteriorated. Therefore, notches 12 are provided on both sides of each recess 11 .
  • the notch portion 12 By providing the notch portion 12 , the concave portion 11 is deformed in the circumferential direction when the tooth portion 10 is press-fitted, and deformation of the outer shape of the core-back portion 9 can be suppressed. Furthermore, since the side surface of the concave portion 11 is deformed, the press-fitting load is reduced, and seizure can be prevented.
  • the notch 12 may be provided on at least one side of the recess 11 .
  • FIG. 6 is a first explanatory diagram for explaining various dimensions of the core-back portion 9 according to the first embodiment.
  • FIG. 7 is a second explanatory diagram for explaining various dimensions of the core-back portion 9 according to the first embodiment.
  • the core-back portion 9 has a configuration in which a plurality of circular magnetic steel plates having a thickness t are laminated, and has a concave portion 11 for fitting the tooth portion 10 on the inner peripheral side, and a concave portion 11 provided on both sides of the concave portion 11. and a notch 12 .
  • the thickness t is between 0.3 mm and 0.65 mm.
  • a portion between the concave portion 11 and the notch portion 12 is called a fitting holding portion 13 .
  • the width of the fitting holding portion 13 is W1
  • the width of the notch portion 12 is W2.
  • L1 be the radius of the concave portion 11
  • L2 be the radius of the notch portion 12.
  • L3 be the inner diameter (radius) of the core back portion 9 .
  • a radius L ⁇ b>1 of the recess 11 is the distance from the central axis O of the stator 1 to the bottom of the recess 11 .
  • the radius L2 of the notch 12 is the distance from the central axis O of the stator 1 to the bottom of the notch 12 .
  • the radial height of the core back portion 9 is D1
  • the depth of the recess 11 is D3
  • the radial height of the back of the recess 11 is D2.
  • the back portion of the concave portion 11 is a portion from the bottom portion of the concave portion 11 to the outer diameter portion of the core back portion 9 .
  • D1 D2+D3.
  • the depth of the notch 12 is assumed to be D4.
  • L3+D3 L1.
  • L3+D4 L2.
  • Wt be the width of the tooth portion 10 .
  • the interval between adjacent notches 12 with no recess 11 interposed therebetween is defined as Wc.
  • N be the number of teeth 10 .
  • the cutout portion 12 is formed such that the width W1 of the fitting holding portion 13 satisfies the following formula (1). 2 ⁇ t ⁇ W1 ⁇ 3 ⁇ t (1)
  • the width W1 of the fit-and-hold portion 13 is at least twice the thickness t of the electromagnetic steel sheet and at most three times the thickness t of the electromagnetic steel sheet.
  • width W1 is larger than 3 ⁇ t, it becomes difficult to deform the concave portion 11 in the circumferential direction during press-fitting, and deformation of the outer shape increases.
  • the recessed portion 11 may break, so it is desirable that the width W1 of the fitting holding portion 13 is 2 ⁇ t or more.
  • the notch 12 is formed such that the width W2 of the notch 12 satisfies the following formula (2). t ⁇ W2 ⁇ 3 ⁇ t (2)
  • the width W2 of the notch 12 is equal to or greater than the thickness t of the electromagnetic steel sheet and equal to or less than three times the thickness t of the electromagnetic steel sheet.
  • width W2 is smaller than t, it becomes difficult to machine the notch 12, so it is desirable that the width W2 of the notch 12 is t or more.
  • the width of the magnetic flux flowing in the core back portion 9 is narrowed. If the width W2 is larger than 3 ⁇ t, the magnetic flux concentration in the core-back portion 9 is affected, so it is desirable that the width W2 is 3 ⁇ t or less.
  • the interval Wc which is a section that can ensure the radial height D1
  • Wc ⁇ Wt it is desirable that the interval Wc of the notch 12 is equal to or greater than the width Wt of the tooth 10 .
  • D3 ⁇ D1/2 it is desirable that the depth D3 of the recess 11 is less than half the radial height D1 of the core-back portion 9 . By doing so, the strength of the core back portion 9 can be maintained.
  • L2 ⁇ L1. That is, it is desirable that D4 ⁇ D3 and that the depth D4 of the notch 12 is equal to or less than the depth D3 of the recess 11 . This is because magnetic flux concentration in the core-back portion 9 is affected when the depth D4 of the notch portion 12 is increased.
  • the notch portions 12 are provided on both sides of each recess portion 11 of the core back portion 9 . Therefore, when the tooth portion 10 is press-fitted, the concave portion 11 is deformed in the circumferential direction, and deformation of the outer shape of the core back portion 9 can be suppressed. Furthermore, the press-fitting load is reduced, and seizure can be prevented. That is, according to Embodiment 1, the tooth portion 10 is precisely integrated with the core back portion 9 by press-fitting, and an inexpensive and highly efficient inner rotor type electric motor can be obtained.
  • Embodiment 2 An inner rotor type electric motor according to a second embodiment will be described with reference to FIGS. 8 to 13.
  • FIG. In Embodiment 2, the core-back portion 9 is formed by combining and laminating an electromagnetic steel sheet with the notch 12 and an electromagnetic steel sheet without the notch 12 .
  • FIG. 8 is a partially enlarged view showing a first example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 9 is a partially enlarged view showing a second example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 8 is a partially enlarged view showing a first example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 9 is a partially enlarged view showing a second example of the laminated state of the electromagnetic steel sheets in the core
  • FIG. 10 is a partially enlarged view showing a third example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 11 is a partially enlarged view showing a fourth example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 12 is a partially enlarged view showing a fifth example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • FIG. 13 is a partially enlarged view showing a sixth example of the laminated state of the electromagnetic steel sheets in the core-back portion 9 of the inner rotor type electric motor according to the second embodiment.
  • the black-painted parts indicate the notch parts 12.
  • the electromagnetic steel sheets 20 with the notch 12 and the electromagnetic steel sheets 30 without the notch 12 are laminated together.
  • the tooth portion 10 can be easily press-fitted, but the positioning performance deteriorates. If the teeth 10 are tilted during press-fitting, the recesses 11 having the cutouts 12 cannot correct the tilt, and the teeth 10 cannot be vertically press-fitted.
  • the magnetic steel sheets 20 having the cutouts 12 and the magnetic steel sheets 30 without the cutouts 12 are mixed and laminated, and both the positioning property and the effect of the cutouts 12 can be achieved. I'm trying
  • the electromagnetic steel sheets 20 with the notch 12 and the electromagnetic steel sheets 30 without the notch 12 are alternately arranged one by one.
  • the electromagnetic steel sheet 20 having the notch 12 is arranged in the central portion, and the electromagnetic steel sheets 30 without the notch 12 are arranged at both ends.
  • the electromagnetic steel sheets 20 with the cutouts 12 are arranged on the upper surface side and the central part, and the electromagnetic steel sheets 30 without the cutouts 12 are arranged on the lower surface side.
  • the electromagnetic steel sheets 20 with the cutouts 12 are arranged on the lower surface side and the central part, and the electromagnetic steel sheets 30 without the cutouts 12 are arranged on the upper surface side.
  • a plurality of electromagnetic steel sheets 20 having notches 12 and a plurality of electromagnetic steel sheets 30 having no notches 12 are alternately arranged.
  • the cases of FIGS. 12 and 13 are effective for those having a large lamination thickness.
  • the electromagnetic steel sheets 20 having the cutout portions 12 and the electromagnetic steel sheets 30 having no cutout portions 12 are mixed and laminated, the positionability and the effect of the cutout portions 12 are obtained. can be compatible.
  • FIG. 14 is a front view of blower 55 including inner rotor type electric motor 100 according to the first embodiment.
  • the inner rotor type electric motor 100 may be applied to a blower 55 that connects blades 54 to the shaft portion 23 and rotates the blades 54 to blow air.
  • the inner rotor type electric motor 100 may be applied to a ventilation fan that rotates blades or impellers to flow air.
  • the inner rotor type electric motor of the second embodiment may be applied to the blower 55 or the ventilation fan.
  • the configuration shown in the above embodiment shows an example of the content of the present disclosure, and can be combined with another known technology. It is also possible to omit or change the part.

Abstract

Un noyau de stator (6) comprend : une partie arrière de noyau cylindrique (9), sur le côté circonférentiel interne duquel une pluralité de parties évidées (11) sont disposées à intervalles ; et une pluralité de parties de dent (10) qui sont ajustées par pression dans la pluralité de parties évidées (11) de la partie arrière de noyau (9), font saillie à partir de la surface circonférentielle interne de la partie arrière de noyau (9), et sont agencées selon une forme radiale. Dans le noyau de stator (6), des parties d'encoche (12) sont respectivement disposées sur au moins un côté de la pluralité de parties évidées (11) de la partie arrière de noyau (9).
PCT/JP2021/019608 2021-05-24 2021-05-24 Moteur électrique à rotor interne et ventilateur WO2022249238A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023523722A JPWO2022249238A1 (fr) 2021-05-24 2021-05-24
PCT/JP2021/019608 WO2022249238A1 (fr) 2021-05-24 2021-05-24 Moteur électrique à rotor interne et ventilateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/019608 WO2022249238A1 (fr) 2021-05-24 2021-05-24 Moteur électrique à rotor interne et ventilateur

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WO2022249238A1 true WO2022249238A1 (fr) 2022-12-01

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PCT/JP2021/019608 WO2022249238A1 (fr) 2021-05-24 2021-05-24 Moteur électrique à rotor interne et ventilateur

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0191628A (ja) * 1987-10-02 1989-04-11 Matsushita Electric Ind Co Ltd 固定子
WO2007141907A1 (fr) * 2006-06-05 2007-12-13 Mitsubishi Electric Corporation noyau de fer de type fendu et son procédé de fabrication, et noyau de fer de stator
JP2016063676A (ja) * 2014-09-19 2016-04-25 三菱電機株式会社 回転電機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0191628A (ja) * 1987-10-02 1989-04-11 Matsushita Electric Ind Co Ltd 固定子
WO2007141907A1 (fr) * 2006-06-05 2007-12-13 Mitsubishi Electric Corporation noyau de fer de type fendu et son procédé de fabrication, et noyau de fer de stator
JP2016063676A (ja) * 2014-09-19 2016-04-25 三菱電機株式会社 回転電機

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