WO2022102248A1

WO2022102248A1 - Stator and fan using same

Info

Publication number: WO2022102248A1
Application number: PCT/JP2021/034574
Authority: WO
Inventors: 恭佑笹生; 俊哉内田; 佑希中田
Original assignee: 日本電産コパル電子株式会社
Priority date: 2020-11-13
Filing date: 2021-09-21
Publication date: 2022-05-19
Also published as: JP2022078617A

Abstract

These stator and fan using the stator enable the height of crossover lines overlapped with each other to be reduced. The stator 17 is provided with an insulator 27, at least two windings (U1, U2, V1, V2, W1, W2), and at least one projection 27i. The insulator 27 has a cylindrical portion 27a, a plurality of winding portions 27b, a base portion 27c having an opening portion 27e, and a side wall 27f provided around the opening portion. The at least two windings include at least two coils (UB1, UB2…WC1, WC2) and a plurality of crossover lines CL positioned between the two coils. The at least one projection 27i is provided at a position where the crossover lines CL intersect with each other.

Description

Stator and blower using it

An embodiment of the present invention relates to a motor stator and a blower using the same.

For example, a motor stator applied to an axial fan or the like is formed of a plurality of cores arranged radially, a plurality of winding portions covering each core, and a plurality of winding portions wound around each winding portion. Includes multiple coils consisting of windings of. Each winding contains a substantially linear crossover between the coils, resulting in a portion of the upper surface and / or lower surface of the stator where a plurality of crossovers of each winding overlap. As the number of windings wound around the stator increases, the number of overlapping crossovers increases, the height of the overlapping crossovers increases, and the stator and motor become larger.
Measures to prevent this have been considered (see, for example, Patent Document 1).

Japanese Patent No. 4308842

In a motor applied to an axial fan or the like, when the shaft of the rotor having an impeller is held in a non-contact manner with respect to the stator, when the rotor is rotated, the rotor is thrust in the thrust direction (direction along the axis). ) Is applied, and the rotor is moved in the thrust direction. In order to prevent the motor from becoming larger, the moving distance of the rotor in the thrust direction is shortened, and the distance between the rotor and the stator is also shortened. Therefore, as described above, when the height of the overlapping crossovers is high in the stator, the crossovers come into contact with, for example, the rotor, and the stator cannot be incorporated into the blower.

The present embodiment provides a stator capable of lowering the height of overlapping crossovers and a blower using the stator.

The stator of the present embodiment is provided at a cylindrical portion, a plurality of winding portions radially provided on the outside of the tubular portion, and one end portion in the longitudinal direction of the tubular portion, and a shaft is inserted into the central portion. An insulator having a circular base having an opening, a side wall provided around the opening of the base, and at least two non-adjacent windings of the plurality of windings continuously. At least two windings, including at least two coils and a plurality of crossovers located on the base between the two coils, and at least two on a portion of the outer surface of the sidewall. It comprises at least one protrusion provided at a position where the plurality of crossovers of the winding intersect.

The blower of the present embodiment is a blower including a stator, a rotor that is rotatable with respect to the stator and has an impeller and a shaft, and a bearing that holds the shaft in a non-contact manner, and the stator is a blower. , A tubular portion, a plurality of winding portions radially provided on the outside of the tubular portion, and an opening provided at one end in the longitudinal direction of the tubular portion and into which the shaft is inserted in the central portion. An insulator having a circular base and a side wall provided around the opening of the base, and at least two non-adjacent windings of the plurality of windings, at least continuously wound. The plurality of windings, including two coils and a plurality of crossovers located on the base between the two coils, and the plurality of the at least two windings on a portion of the outer surface of the sidewall. It comprises at least one protrusion provided at a position where the crossovers of the above cross.

The perspective view which shows the blower which concerns on this embodiment. FIG. 1 is a cross-sectional view taken along the line II-II of FIG. A part of FIG. 1 is taken out and shown, and is a top view showing a stator according to the present embodiment. An exploded perspective view showing a part of the stator shown in FIG. The circuit diagram which shows the relationship between a winding, a coil and a crossover shown in FIG. The figure which shows the position where the plurality of crossover lines intersect and the position of a protrusion shown in FIG. FIG. 2 is an enlarged cross-sectional view showing part A in FIG.

Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same parts are designated by the same reference numerals.

1 and 2 show an example of a blower according to the present embodiment.
In the blower 10, two

blowers

10a and 10b are arranged so as to overlap each other. The

blowers

10a and 10b are all axial flow fans, and they are connected so as to blow air in the same direction. Specifically, the housing 11a of the blower 10a includes an intake port 12a and an exhaust port 12b, and the housing 11b of the blower 10b includes an intake port 12c and an exhaust port 12d, and the intake port 12a and the blower 10b of the blower 10a. Is connected to the exhaust port 12d of. However, the exhaust port 12b of the blower 10a and the intake port 12c of the blower 10b may be connected.

Further, the blower 10 is not limited to two, and may be one blower or three or more blowers may be connected.

Since the

blowers

10a and 10b have substantially the same shape, only the blowers 10a will be described below.
The housing 11a of the blower 10a has a substantially cylindrical inner surface, and a substantially cylindrical pedestal 13 is provided inside the housing 11a on the side of the intake port 12a. The pedestal 13 is connected to the housing 11a by a plurality of beams 14 arranged radially. The housing 11a, the plurality of beams 14, and the pedestal 13 are integrally formed of, for example, a resin material.

The motor 15 is mounted on the pedestal 13. The motor 15 has a rotor 16 and a stator 17, and an impeller 18 having a plurality of blades is attached to the outside of the rotor 16.

The pedestal 13 has a bottom portion 13a, and a hub 19 is provided at the center of the bottom portion 13a. The hub 19 includes a disk-shaped base portion 19a and a tubular portion 19b provided at the center of the base portion 19a. A magnetic bearing 20 is provided inside the tubular portion 19b. The magnetic bearing 20 has, for example, an outer ring and an inner ring made of a permanent magnet, the outer ring is fixed to the hub 19, and the inner ring is rotatable with respect to the outer ring. One end of the shaft 21 is fixed to the inner ring of the magnetic bearing 20, and the other end is fixed to the holder 22 provided in the central portion of the rotor 16. A disk-shaped partition plate 29 is provided at the bottom of the hub 19 so as to be separated from the magnetic bearing 20.

The shaft 21 is rotatably arranged inside the tubular body 23, and the tubular body 23 is fixed to the inner surface of the tubular portion 19b of the hub 19. The shaft 21 and the cylinder 23 are made of, for example, metal, and the shaft 21 and the cylinder 23 form, for example, a pneumatic bearing. Specifically, a fine gap is provided between the shaft 21 and the tubular body 23, and a fine groove in the shape of a herringbone, which is not shown, is formed around the shaft 21.

For example, a cylindrical permanent magnet 24 is fixed to the inner surface of the rotor 16, and a stator 17 is arranged inside the permanent magnet 24.

The stator 17 is fixed to the outer surface of the tubular body 23. The stator 17 includes a core 25, a plurality of coils 26, and an insulator 27. The insulator 27 is formed of, for example, an insulating resin, and the core 25 is made of metal. The core 25 is held inside the insulator 27, and the plurality of coils 26 are wound around the outside of the insulator 27. A substrate 28 is provided below the stator 17 and inside the pedestal 13. On the substrate 28, for example, a control circuit (not shown) for controlling the motor 15 is arranged.

3 and 4 show the stator 17.
In the stator 17, a plurality of coils 26 are wound around the insulator 27 to form a coil assembly.

As shown in FIG. 4, the insulator 27 is divided into an upper part 27-1 and a lower part 27-2, and the core 25 is mounted inside the upper part 27-1 and the lower part 27-2. Since the upper part 27-1 and the lower part 27-2 have almost the same configuration, the upper part 27-1 will be used for explanation, and the same parts as the upper part 27-1 in the lower part 27-2 will be designated by the same reference numerals.

The insulator 27 includes a tubular portion 27a, a plurality of winding portions 27b radially arranged around the tubular portion 27a, and a circular base portion 27c provided at one end in the axial direction of the tubular portion 27a. have. A space is formed between the adjacent winding portions 27b by the slot 27d, and the coil 26 wound around the winding portion 27b is arranged in these spaces. In the present embodiment, the number of winding portions 27b is 9, but is not limited to this, and may be, for example, 6.

An opening 27e into which the shaft 21 and the tubular body 23 are inserted is provided in the central portion of the base portion 27c, and a cylindrical side wall 27f is provided around the opening 27e. A step portion 27g is provided on the outer surface of the side wall 27f, and the thickness of the side wall 27f is thicker below the step portion 27g than above the step portion 27g. That is, as shown in FIG. 7, the side wall 27f has a first portion P1 having a first thickness and a second portion P2 thinner than the first thickness. The position of the step portion 27g with respect to the height of the side wall 27f in the axial direction will be described later.

Further, a groove 27h is provided along the axial direction in a part of the side wall 27f. The groove 27h is used, for example, to insert a jig (not shown) used when winding the coil 26 described later, and to position the insulator 27.

The core 25 has almost the same shape as the insulator 27, the core 25 is incorporated in the cylindrical portion 27a and the winding portion 27b of the insulator 27, and the plurality of flanges 25a of the core 25 are exposed to the outside of the insulator 27. Will be done. As shown in FIG. 3, the coil 26 is wound around the outside of each winding portion 27b of the insulator 27 in a state where the core 25 is integrated with the insulator 27. The coil 26 is a so-called bifilar winding, and two coils are wound around each winding portion 27b.

3 and 5 show the relationship between the two coils 26 wound around each winding portion 27b. In the present embodiment, three sets of a pair of windings (U1, U2), (V1, V2), and (W1, W2) are provided, and a U-phase coil, a V-phase coil, and a W-phase coil are configured.

The windings U1 and U2 are wound around three winding portions 27b separated by a predetermined interval of the insulator 27, respectively, and the three sets of coils (UA1, UA2), (UB1, UB2) and (UC1, UC2) shown in FIG. 3 are wound. ) Is formed. The three winding portions 27b are separated by, for example, 120 °.

Like the windings U1 and U2, the windings V1 and V2 are also wound around three winding portions 27b separated by 120 ° from the insulator 27, respectively, and three sets of coils (VA1, VA2), (VB1, VB2). , (VC1, VC2) are formed.

Like the windings U1 and U2, the windings W1 and W2 are also wound around three winding portions 27b separated by 120 ° from the insulator 27, respectively, and three sets of coils (WA1, WA2) and (WB1, WB2). , (WC1, WC2) are formed.

That is, the plurality of winding portions 27b include nine winding portions of the first winding portion to the ninth winding portion, and the winding portion corresponding to the groove 27h is used as the first winding portion in a clockwise direction. The 2nd to 9th winding parts are arranged. The windings that are continuously wound around the 1st, 4th, and 7th turns form a V-phase coil, and the windings that are continuously wound around the 8th, 2nd, and 5th turns are U-phase coils. , And the windings that are continuously wound around the 3rd, 6th, and 9th winding portions form a W-phase coil.

Each coil 26 ((UA1, UA2), (UB1, UB2), (UC1, UC2), (VA1, VA2), (VB1, VB2), (VC1, VC2), (WA1, WA2), (WB1, WB2) ) And (WC1, WC2)) are arranged on the front surface of the base 27c of the insulator 27 or the back surface (not shown) as a crossover CL, respectively.

As shown in FIG. 3, when the coil 26 is wound around the nine winding portions 27b using three sets of a pair of windings, a plurality of crossover CLs intersect at a plurality of points.

FIG. 6 shows three sets of windings (U1, U2), (V1, V2), (W1, W2) (in FIG. 6, simply indicated as U, V, W) and nine winding portions. Based on the angle of 27b (0 to 345 °), the position where a plurality of crossover lines CL intersect is shown. The reference of the angle (0 °) is, for example, the position of the groove 27h provided on the side wall 27f. The shaded area indicates the position of the crossover CL of the three sets of windings U, V, and W. In the case of the present embodiment, the number of crossover lines CL that intersect is large in the range of an angle of 25 ° to 40 °, the range of 105 ° to 120 °, and the range of 185 ° to 200 °. At a location where the number of crossover lines CL is large, it is considered that the height of the plurality of crossover lines CL that intersect exceeds the height of the side wall 27f of the insulator 27. Therefore, the insulator 27 has a configuration for suppressing the heights of the plurality of crossover lines CL that intersect with each other.

Specifically, the insulator 27 is provided with a plurality of protrusions 27i on the outer surface of the side wall 27f. The plurality of protrusions 27i are provided on the first portion P1 at the boundary of the stepped portion 27g of the side wall 27f. In the present embodiment, the number of protrusions 27i provided on the insulator 27 is, for example, three. However, the number is not limited to three, and may be two or less, or four or more as long as it does not cover the entire circumference.

The position where the three protrusions 27i are provided around the side wall 27f corresponds to a place where the number of crossover lines CL is large. That is, in the case of the present embodiment, the angle 55 ° between the coils UB1 and UB2 and the coils WC1 and WC2, one of the angles 105 ° to 120 ° corresponding to the coils VB1 and VB2, and the coils WB1 and WB2. The protrusion 27i is arranged at an angle of 215 ° between the coils VC1 and VC2.

In other words, of the three protrusions 27i, the first protrusion is arranged correspondingly between the second winding portion and the third winding portion, and the second projection is from the fourth winding portion to the fifth winding portion. The third protrusion is arranged corresponding to the range of the turning portion, and the third protrusion is arranged correspondingly between the sixth winding portion and the seventh winding portion.

Therefore, the plurality of crossover crossover lines CL are arranged between the base portion 27c of the insulator 27 and the three protrusions 27i, and the height of the plurality of crossover lines CL is limited by the protrusions 27i. That is, the height of the plurality of crossover lines CL is lowered by the protrusions 27i.

In the range of the angle of 105 ° to 120 °, the number of protrusions 27i may be one as in the present embodiment, or one or two or more over the range of the angle of 105 ° to 120 °. There may be.

The height of the side wall 27f in the direction along the axial center of the first portion P1, that is, the position of the protrusion 27i with respect to the axial direction of the side wall 27f is, for example, the height of the crossed crossover CL and the axial direction of the rotor 16. It is determined according to the distance traveled to.

FIG. 7 is an enlarged view of part A in FIG. 2, and shows the positional relationship between the side wall 27f of the insulator 27 and the holder 22 of the shaft 21.

In the present embodiment, the shaft 21 is held by the pneumatic bearing and the magnetic bearing 20 in a non-contact manner with respect to the stator 17. Therefore, as the rotor 16 rotates, the shaft 21 moves in the thrust direction (axial direction). Specifically, when the rotor 16 is rotated and an air flow from the intake port 12a shown in FIG. 2 to the exhaust port 12b is generated, the rotor 16 moves in the direction of arrow B shown in FIG. 7 by a force in the direction opposite to the air flow. .. That is, the rotor 16 and the holder 22 move together with the shaft 21 in a direction approaching the upper surface of the insulator 27. However, since the height of the crossover CL is regulated by the protrusion 27i, the rotor 16 and the holder 22 are prevented from coming into contact with the crossover CL.

As shown in FIG. 7, the holder 22 has a ring-shaped recess 22b in the bottom portion 22a. The recess 22b is provided along the periphery of the shaft 21. Therefore, when the shaft 21 and the holder 22 move more significantly in the direction of arrow B in the drawing, the top of the side wall 27f of the insulator 27 enters the ring-shaped recess 22b, and contact can be avoided at this portion. Further, when the shaft 21 is moved in the direction of arrow B in the drawing, one end of the shaft 21 comes into contact with the partition plate 29 shown in FIG. 2, and the movement of the rotor 16 in the thrust direction is restricted.

In the base portion 27c of the insulator 27, openings 27j are provided in the portions facing the three protrusions 27i, respectively. By providing these openings 27j, the three protrusions 27i can be integrally formed with the resin together with the insulator 27.

(Effect of embodiment)
According to the above embodiment, the insulator 27 of the stator 17 has a plurality of protrusions 27i corresponding to the positions where the plurality of crossover CLs intersect. Therefore, the height of the plurality of crossovers CL crossed can be limited to the height of the protrusion 27i, and the contact between the plurality of crossovers CL of the stator 17 and the rotor 16 can be prevented. Therefore, the rotor 16 can be easily incorporated into the stator 17, and the assembly work can be facilitated.

Further, when the shaft 21 moves in the thrust direction, the top of the side wall 27f of the insulator 27 enters the ring-shaped recess 22b, and when the shaft 21 further moves in the thrust direction, one end of the shaft 21 is partitioned. It abuts on the plate 29. However, since the height of the crossed crossover CL is limited by the plurality of protrusions 27i, the distance between the bottom portion 22a of the holder 22 and the crossover CL is kept constant by the protrusions 27i. Therefore, even when the shaft 21 moves in the thrust direction, it is possible to prevent the holder 22 from coming into contact with the crossover CL and the coil.

In addition, the present invention is not limited to each of the above embodiments as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in each of the above embodiments. For example, some components may be removed from all the components shown in the embodiments. In addition, components across different embodiments may be combined as appropriate.

Claims

A circular shape having a tubular portion, a plurality of winding portions radially provided on the outside of the tubular portion, and an opening provided at one end in the longitudinal direction of the tubular portion and into which a shaft is inserted in the central portion. An insulator having a base of the base and a side wall provided around the opening of the base.
Includes at least two coils wound continuously on at least two non-adjacent windings of the plurality of windings and a plurality of crossovers located on the base between the two coils. At least two windings and
With at least one protrusion provided at a position where the plurality of crossovers of the at least two windings intersect on a part of the outer surface of the side wall.
A stator characterized by being provided with.
The position of the at least one protrusion corresponding to the reference position of the side wall is 55 °, a range of 105 ° to 120 °, and 215 °, where 0 ° is the reference position, and the number of the protrusions is The stator according to claim 1, wherein the number is 1 or 2 or more in the range of 105 ° to 120 °.
The plurality of winding portions include the first winding portion to the ninth winding portion.
The windings that are continuously wound around the first, fourth, and seventh winding portions form a V-phase coil.
The windings that are continuously wound around the second, fifth, and eighth winding portions form a U-phase coil.
The windings that are continuously wound around the third, sixth, and ninth winding parts form a W-phase coil.
The at least one protrusion includes first to third protrusions.
The first protrusion is arranged on the outer surface of the side wall corresponding to the second winding portion and the third winding portion.
The second protrusion is arranged on the outer surface of the side wall corresponding to the range from the fourth winding portion to the fifth winding portion.
The third protrusion is arranged on the outer surface of the side wall corresponding between the sixth winding portion and the seventh winding portion.
The stator according to claim 1.
The stator according to claim 1, wherein the base portion has an opening in a portion corresponding to the at least one protrusion.
With the stator,
A rotor that is rotatable with respect to the stator and has an impeller and a shaft,
A bearing that holds the shaft in a non-contact manner,
It is a blower equipped with
The stator is
A circle having a tubular portion, a plurality of winding portions radially provided on the outside of the tubular portion, and an opening provided at one end in the longitudinal direction of the tubular portion and into which the shaft is inserted in the central portion. An insulator having a base of the shape and a side wall provided around the opening of the base.
Containing at least two coils and a plurality of crossovers located on the base between the two coils, which are continuously wound around at least two non-adjacent windings of the plurality of windings. At least two windings and
With at least one protrusion provided at a position where the plurality of crossovers of the at least two windings intersect on a part of the outer surface of the side wall.
A blower characterized by being equipped with.
The position of the at least one protrusion corresponding to the reference position of the side wall is 55 °, a range of 105 ° to 120 °, and 215 °, where 0 ° is the reference position, and the number of the protrusions is The blower according to claim 5, wherein the number is 1 or 2 or more in the range of 105 ° to 120 °.
The plurality of winding portions include the first winding portion to the ninth winding portion.
The windings that are continuously wound around the first, fourth, and seventh winding portions form a V-phase coil.
The windings that are continuously wound around the second, fifth, and eighth winding portions form a U-phase coil.
The windings that are continuously wound around the third, sixth, and ninth winding parts form a W-phase coil.
The at least one protrusion includes first to third protrusions.
The first protrusion is arranged on the outer surface of the side wall corresponding to the second winding portion and the third winding portion.
The second protrusion is arranged on the outer surface of the side wall corresponding to the range from the fourth winding portion to the fifth winding portion.
The third protrusion is arranged on the outer surface of the side wall corresponding between the sixth winding portion and the seventh winding portion.
The blower according to claim 5.
The blower according to claim 5, wherein the base portion has an opening in a portion corresponding to the at least one protrusion.
The blower according to claim 5, wherein the rotor is provided on the shaft by a holder, and the holder is provided with a recess along the periphery of the shaft through which the side wall of the insulator can enter. ..