WO2013094234A1

WO2013094234A1 - Fan motor and fan motor manufacturing method

Info

Publication number: WO2013094234A1
Application number: PCT/JP2012/061978
Authority: WO
Inventors: 森　剛
Original assignee: 三菱電機株式会社
Priority date: 2011-12-19
Filing date: 2012-05-10
Publication date: 2013-06-27
Also published as: JP5746372B2; JPWO2013094234A1

Abstract

This fan motor is equipped with: a blade section (10); a motor (40) that has a rotor (20) and multiple stators (30); and a polygonal housing (50). When the distance between auxiliary teeth (35) provided on either end within one stator (30) is defined as a first-order auxiliary teeth pair interval, the distance between the respective first-order auxiliary teeth pairs of two stators is defined as a second-order auxiliary teeth pair interval, and n^th-order auxiliary teeth pair intervals (n is an integer equal to or greater than 1) are defined in the same manner, the positions of the respective auxiliary teeth of two or more stators are shifted from each other so as to form the respective stators into different shapes, and a desired interval is set for each n^th-order auxiliary teeth pair, in order to minimize cogging 2 * n^th-order components.

Description

Fan motor and fan motor manufacturing method

The present invention relates to a fan motor used for an air conditioner, for example, for simultaneously suppressing a plurality of cogging frequency components, and a method of manufacturing the fan motor.

Conventional air conditioners have been proposed to use a propeller fan in the fan unit in order to make the indoor unit thinner and smaller. Such a propeller fan is provided with a boss portion having a rotation center and a blade portion having blades formed on the outer peripheral side from the boss portion. And the motor which rotates a blade | wing part is provided in the boss | hub part. That is, the motor is an outer rotor type, and a blade portion is provided on the rotor side (rotation side).

For this reason, when the motor is enlarged, the size of the blades arranged outside the motor is limited, and the ventilation path is blocked. Therefore, there is a problem that a sufficient air volume cannot be obtained, or that the degree of freedom in design of the blade portion is small and the fan efficiency is lowered. Further, if the size of the motor is reduced in order to secure the ventilation path, there is a problem that the efficiency of the motor itself is lowered.

Therefore, in order to solve these problems, for example, a magnet is annularly attached to the outer peripheral portion of the fan, and the outer surface of the magnet is sequentially arranged in the circumferential direction as N pole, S pole, N pole, etc., There has been proposed a fan motor in which a plurality of fixed coils are arranged outside the magnet and an annular yoke is provided outside the coil (see, for example, Patent Document 1).

Such a fan motor can make the boss portion smaller than a fan motor provided with a boss portion. For this reason, since a ventilation path can be enlarged, a blade | wing can be enlarged to the rotating shaft vicinity, and the design freedom of a fan motor improves. In addition, since such a fan motor can increase the rotor radius, a large torque can be obtained and an improvement in efficiency can be expected.

However, in this example, the stator occupies a large area because the stator exists all around. In order to solve this, it can be considered that the stator is divided into a plurality of parts, but in such a configuration, there is a problem that cogging becomes large. In order to reduce the increased cogging, there is a method in which auxiliary teeth are provided at both ends of the stator (see, for example, Patent Document 2).

JP 61-52181 (first page, FIG. 1) Japanese Patent Laying-Open No. 2004-166383 (page 21, FIG. 16)

However, the prior art has the following problems.
Such arrangement of the auxiliary teeth in Patent Document 2 can suppress one of the cogging frequency components by adjusting the interval between the left and right auxiliary teeth. However, it is impossible to suppress two or more components at the same time. In cogging, a plurality of components are usually mixed, and the auxiliary teeth width for suppressing them is different. Therefore, although the entire cogging can be reduced by this method, it cannot be reduced to zero.

The present invention has been made in order to solve the above-described problems, and it is possible to obtain a fan motor that is theoretically free of cogging and a method of manufacturing the fan motor by simultaneously suppressing a plurality of cogging frequency components. Objective.

A fan motor according to the present invention is provided at both ends of a blade, a rotor provided on the outer periphery of the blade, a tooth on the outer peripheral side of the rotor, and a tooth provided on the inner peripheral surface. A fan motor comprising a motor including two or more stators having a provided auxiliary tooth and a polygonal housing arranged to cover the outer peripheral side of the stator and the rotor, and arranged at both ends in one stator The distance between the auxiliary teeth is defined as the distance between the auxiliary teeth primary pair, and the distance between the primary teeth of each of the two stators is defined as the distance between the auxiliary teeth secondary pair. When defining the spacing of teeth n-order pairs (n is an integer of 1 or more), the placement of auxiliary teeth in each of two or more stators is shifted to Theta shape with different, by a desired spacing for each auxiliary teeth n th pair, is to suppress the cogging 2 * n-order components.

The fan motor manufacturing method according to the present invention includes a blade portion, a rotor provided on the outer peripheral portion of the blade portion, a tooth disposed on the outer peripheral side of the rotor via a gap, and a tooth provided on the inner peripheral surface. A method of manufacturing a fan motor comprising a motor including two or more stators having auxiliary teeth provided at both ends of a tooth, and a polygonal housing arranged to cover the outer peripheral side of the stator and the rotor, The distance between the auxiliary teeth arranged at both ends in one stator is defined as the interval between the auxiliary teeth primary pair, and the distance between each auxiliary teeth primary pair of the two stators is the interval between the auxiliary teeth secondary pair. In the same way, when the interval of the auxiliary teeth n-order pair (n is an integer of 1 or more) is defined, the desired interval is set for each auxiliary tooth n-order pair. Forming two or more stators having different shapes by shifting the arrangement of auxiliary teeth in each of the two or more stators so as to suppress the cogging 2 * n order component; And a step of disposing the stator in a polygonal housing with a gap on the outer peripheral side of the rotor.

According to the fan motor and the method of manufacturing the fan motor according to the present invention, the auxiliary teeth are shifted and the shapes of the stators are made different so that each component of cogging is individually suppressed by the m-order pair of the auxiliary teeth. It is possible to obtain a fan motor that is theoretically free of cogging and a method of manufacturing the fan motor by simultaneously suppressing a plurality of frequency components of cogging.

It is a front view which shows the fan motor by Embodiment 1 of this invention. It is a front view which shows the stator of the fan motor by Embodiment 1 of this invention. It is a graph which shows cogging of the conventional fan motor. It is a front view which shows the positional relationship of two stators of the fan motor by Embodiment 1 of this invention. It is a stator positional relationship figure of the fan motor by Embodiment 1 of this invention. It is explanatory drawing of the shape of the stator core of the fan motor by Embodiment 3 of this invention. It is the front view and positional relationship figure which show the stator of the fan motor by Embodiment 4 of this invention.

Hereinafter, preferred embodiments of a fan motor and a fan motor manufacturing method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a front view showing a fan motor according to Embodiment 1 of the present invention. The fan motor according to the first embodiment has an axial fan structure, and includes a motor 40 including a blade portion 10, a rotor 20, and a stator 30, a housing 50, and the like.

The housing 50 shown in FIG. 1 has a substantially rectangular frame shape, and the blade portion 10 is provided inside. In addition, the blade portion 10 includes a boss portion 11, a plurality of blades 12, and a ring 13. The boss portion 11 is a rotation center of the blade portion 10, and a blade 12 is formed on the outer peripheral portion thereof. A substantially annular ring 13 is formed on the outer periphery of the blade 12.

The blade portion 10 is integrally formed of a resin material, for example. A rotating shaft and a bearing (not shown) into which the rotating shaft is inserted are disposed inside the boss portion 11. The outer peripheral part of this bearing is hold | maintained at the housing 50, for example.

In addition, the material which forms the blade | wing part 10 should just be a material which can ensure the rigidity which does not deform | transform by not only a resin material but magnetic attraction (magnetic attraction between the rotor 20 and the stator 30), air resistance, etc. . For example, the material forming the blade portion 10 may be a metal material or the like.

A rotor 20 is provided on the outer peripheral surface of the ring 13 of the blade portion 10. The rotor 20 includes a magnet 21 and a rotor core 22. The rotor core 22 has a substantially annular shape, and is provided on the outer peripheral surface of the ring 13. In addition, the magnet 21 has a substantially annular shape and is provided on the outer peripheral surface of the rotor core 22.

The magnet 21 is a rubber magnet having a thickness of 1.5 mm and a residual magnetic flux density of 0.245 T, for example. The magnet 21 has a flat plate shape, and the orientation of the magnet 21 is normal parallel magnetization and 32 poles. The magnet 21 is wound around and adhered to the outer peripheral surface of the rotor core 22. In the first embodiment, the axial width of the magnet 21 (the width in the rotational axis direction of the blade portion 10) is, for example, 10 mm, and is matched with the axial width of the stator.

Note that the magnet 21 may be a rare earth sintered magnet, a plastic magnet, a ferrite magnet, or the like. Further, the method of fixing the magnet 21 to the rotor core 22 is not limited to the method of the first embodiment. For example, the magnet 21 may be formed in a substantially annular shape, and the rotor core 22 may be fitted on the inner peripheral surface of the magnet 21. Further, for example, the magnet 21 may be divided into a plurality of segments, and these segments may be attached to the outer peripheral surface of the rotor core 22.

When the magnet 21 is divided into a plurality of segments, the circumferential width of each segment may be made smaller than the pole pitch, and a space may be provided between the segments. Further, for example, when the blade portion 10 is used while being rotated at a high speed, it may be fixed from the outside of the magnet 21 with a nonmagnetic material such as glass epoxy (glass fiber + epoxy resin). Further, for example, the axial width of the magnet 21 may be made larger than the axial width of the stator to cause overhang. Thereby, the magnetic flux leakage from the axial direction edge part of a stator can be suppressed.

The rotor core 22 is obtained by laminating and bonding electromagnetic steel sheets and processing them into a ring shape. As the material of the rotor core 22, a thick iron core and other magnetic materials can be adopted in addition to the electromagnetic steel sheet. In addition, when the orientation of the magnet 21 is the Hullback orientation, the magnetic path does not come to the inner side (blade part side), so the rotor core 22 may not be provided.

Since the rotor core 22 is a magnetic material, it is generally heavy. For this reason, the fan motor can be reduced in weight by not providing the rotor core 22. The rotor may be deformed due to insufficient rigidity of the rotor, and noise may be generated. In such a case, the rotor core 22 may be provided.

FIG. 2 is a front view showing the stator of the fan motor according to the first embodiment of the present invention. As shown in FIG. 2, the stator 30 according to the first embodiment includes a stator core 31, a U-phase tooth 32, a V-phase tooth 33, a W-phase tooth 34, an auxiliary tooth 35, and a fixing hole 36.

The stator core 31 has a substantially L shape. The angle formed by both outer peripheral surfaces of the stator core 31 is substantially the same angle (approximately 90 °) as the corner of the housing 50 to which the stator is attached. Teeth 32 to 34 are provided on the inner peripheral surface of the stator core 31 (the surface facing the blade portion 10). Since the motor according to the first embodiment is a three-phase motor, a U-phase tooth 32, a V-phase tooth 33, and a W-phase tooth 34 are provided on the inner peripheral surface of the stator core 31 as three teeth.

These U-phase teeth 32, V-phase teeth 33, and W-phase teeth 34 are wound with coils (not shown). In addition, auxiliary teeth 35 are provided on both ends of the stator core 31 on the inner peripheral surface side. As with the rotor core 22, the stator 30 is formed by laminating electromagnetic steel sheets into the shape shown in FIGS. 1 and 2 by wire cutting or the like. The stator 30 may be formed of a thick iron core or other magnetic material.

These stators 30 are provided at two opposite corners of the housing 50. That is, the housing 50 is provided so as to cover the outer peripheral side of the motor 40 (the rotor 20 and the stator 30). When the stator 30 is attached to the corners of the housing 50, both outer peripheral surfaces of the stator core 31 are brought into contact with (in contact with) the corners of the housing 50 (more specifically, both side surfaces adjacent to the corners).

Also, the back surface of the stator core 31 is brought into contact with (in contact with) the step portion 51 (see FIG. 1) of the housing 50. Thereby, the stator 30 is positioned at the corner of the housing 50. In this state, a screw or the like (not shown) is inserted from the fixing hole 36 to fix the stator 30 to the corner of the housing 50.

In a state where the stator 30 is fixed to the corner portion of the housing 50, the leading end portions of the U-phase teeth 32, the V-phase teeth 33, the W-phase teeth 34 and the auxiliary teeth 35 and the outer peripheral surface of the magnet 21 of the rotor 20 A certain gap is formed between them.

It should be noted that the position where the stator 30 is provided is not limited to the position shown in the first embodiment. For example, the stator 30 may be provided at one corner of the housing 50. Further, for example, the stator 30 may be provided at three corners of the housing 50. Further, for example, the stator 30 may be provided at all corners (four locations) of the housing 50.

In the first embodiment, in order to balance the magnetic attractive force generated between the rotor 20 and the stator 30, the stator 30 is provided at the opposite corners of the housing 50. By providing the stator 30 at the opposite corners of the housing 50, it is possible to suppress vibration when the blade 10 rotates, and to suppress noise generated when the blade 10 rotates. .

In the fan motor 100 configured as described above, since the stator 30 is disposed at the corner of the housing 50, each side of the housing 50 can be brought close to the vicinity of the outer periphery of the rotor 20. Therefore, the fan motor 100 can be produced in the same size as a conventional fan in which a motor is arranged in the boss portion.

Further, since the motor 40 (the rotor 20 and the stator 30) is provided on the outer peripheral side of the blade portion 10, a large ventilation path can be secured, and the design freedom of the fan motor 100 can be improved.

Here, in the fan motor 100 according to the first embodiment, the stator 30 exists only in a part on the outer peripheral side of the rotor 20. For this reason, when the blade | wing part 10 rotates, we are anxious about generation | occurrence | production of the cogging resulting from the edge part of the stator 30. FIG. Cogging due to this end portion is an attractive force generated between the teeth (U-phase teeth 32, V-phase teeth 33, and W-phase teeth 34) provided on the end portion side of the stator 30 and the magnet 21 of the rotor 20. Caused by. Then, cogging (torque pulsation) caused by the end of the stator 30 becomes twice the number of magnetic pole pairs of the magnet 21 (2f component in terms of electrical angle) when the rotor 20 makes one rotation.

Therefore, for example, when two auxiliary teeth 35 are provided, the distance between the auxiliary teeth 35 is (2m−1) τ / 2 (where m is a positive integer and τ is the pole pitch of the magnetic poles of the magnet 21). By doing so, cogging caused by the end portion of the stator 30 can be offset and reduced. However, this is an ideal state where the circumferential distribution of the gap magnetic flux by the magnetic poles is a sine wave, and is limited to, for example, the case where the magnetization of the magnet 21 is in the Hullback orientation.

In other words, when the magnet 21 is magnetized in a radial orientation, a parallel orientation, or the like, a harmonic component is included in the distribution of the gap magnetic flux (in addition to the 2f component in terms of electrical angle, higher order components such as the 4f component). The components are also superimposed). FIG. 3 is a graph showing the cogging of the conventional fan motor, and shows the relationship between the tip angle (electrical angle) of the auxiliary teeth 35 and the secondary, fourth, sixth and eighth order cogging. For this reason, the distance between the auxiliary teeth 35 suitable for suppressing cogging caused by the end of the stator 30 varies depending on the configuration of the motor 40.

Therefore, in the first embodiment, the cogging secondary component is suppressed by the pair of auxiliary teeth 35 provided at both ends of each stator 30, and the quaternary component is suppressed by the pair of auxiliary teeth 35 (pair of stator 30). The sixth component is suppressed by a pair of auxiliary teeth 35 (a pair of stators 30).

In the stator core 31 shown in FIG. 2, the interval between the auxiliary teeth 35 at both ends is θ1, and the interval from the center of the V-phase teeth 33 to the auxiliary teeth 35 among the three-phase teeth is φ1. . Here, θ1 suppresses the cogging secondary component,
θ1 = magnetic pole pitch * h + magnetic pole pitch / 2 * m
(H, m: integer)
It is said.

FIG. 4 is a front view showing the positional relationship between the two stators of the fan motor according to Embodiment 1 of the present invention, and shows a pair of auxiliary teeth 35 (a pair of stators 30). The auxiliary tooth interval between the

stators

30a and 30b is set to the same θ1 as in FIG. Further, the interval ψ1 of the pair of auxiliary teeth 35 (corresponding to the interval between the

auxiliary teeth

35a and 35b at one end as shown in FIG. 4) is ψ1 = magnetic pole pitch * h + magnetic pole pitch / 4 * m
(H, m: integer)
It is said.

However, since the distance α between the V-

phase teeth

33a and 33b is determined by the slot combination, it is uniquely determined. Therefore, in order to adjust ψ1 while maintaining θ1, φ1a which is the distance between the V-phase tooth 33a and the auxiliary tooth 35a at one end in the stator 30a, the V-phase tooth 33b and the auxiliary tooth 35b at one end in the stator 30b, .Phi.1b, which is the distance between the

stators

30a and 30b, is different in shape because the auxiliary teeth are displaced.

Although not shown in the drawing, similarly, the pair of auxiliary teeth 35 (the pair of stators 30) also has a spacing of magnetic pole pitch * h + magnetic pole pitch / 6 * m (h, m: integer). Configure. Eventually, the four stator cores all have different shapes as much as the auxiliary teeth are displaced.

By arranging the above relationships, the present invention is arranged such that the auxiliary teeth are shifted and the shape of each stator is different, so that the interval between the n-order pairs of auxiliary teeth (n is an integer of 1 or more)
Magnetic pole pitch * h + magnetic pole pitch / 2 / n * m (h, m: integer)
The technical feature is that

In other words, by having such a technical feature, a pair of auxiliary teeth 35 provided at both ends of each stator 30 suppresses a cogging secondary component, and a pair of auxiliary teeth 35 (a pair of stators 30). Thus, the fourth-order component can be suppressed, and the sixth-order component can be suppressed by the pair of auxiliary teeth 35 (the pair of stators 30).

FIG. 5 is a diagram showing the positional relationship between the stators of the fan motor according to the first embodiment of the present invention, and shows the positions of the auxiliary teeth of the four stators 30a to 30d. More specifically, the intervals from the common reference position to the auxiliary teeth 35 at one end of each of the stators 30a to 30d are indicated as β1, β2, β3, and β4, respectively.

Here, (β2−β1) = (β4−β3) corresponds to the distance between the pair of auxiliary teeth 35 (the pair of stators 30), and the above-described angle h for suppressing the quaternary component is different. . Further, (β3-β1) = (β4-β2) corresponds to the distance between the pair of auxiliary teeth 35 (pair of the stator 30), and the angle h for suppressing the sixth component is different. It becomes. Further, since the number of stators shown in FIG. 5 is four (= 2 ^ 2), the remainder of the pair does not occur.

As described above, according to the first embodiment, the configuration and arrangement of the stator are as follows.
The interval between the auxiliary tee spares on both sides of the first stator is arranged to suppress the n primary component of cogging.
The distance between the auxiliary teeth spares of the second stator is also arranged to suppress the cogging n primary component, but the positional relationship with the teeth between the two auxiliary teeth is different from that of the first stator. Thus, the rotation-direction interval between the auxiliary tee spare of the first stator and the auxiliary tee spare of the second stator is arranged so as to suppress the cogging n secondary component (n2 ≠ n1). Has been.

Thus, the auxiliary tee spare on both sides of one stator is a primary pair, and the pair of auxiliary tee spares in two stators (the pair of the auxiliary tee spare of the first stator and the auxiliary tee spare of the second stator) is 2 When the next pair is used, the pair of auxiliary tea spare pairs can be defined as the m-th order pair, and the interval between each pair can be arranged to suppress different cogging components.

By having such a configuration, each component of cogging can be individually suppressed by the m-order pair of auxiliary teeth, and a theoretically non-cogging fan motor can be achieved by simultaneously suppressing a plurality of cogging frequency components. Obtainable. That is, since n cogging frequency components can be suppressed by n pairs, total cogging can be significantly reduced.

Furthermore, the space | interval (n: 1 or more integer) of auxiliary teeth n-order pair is
Magnetic pole pitch * h + magnetic pole pitch / 2 / n * m (h, m: integer)
Have the relationship. As a result, the cogging 2 * n-order component can be suppressed by the n-order pair, and the low-order cogging component is suppressed by the low-order pair, so that the influence of the assembly tolerance on the suppression of the low-order cogging can be reduced.

Furthermore, by setting the number of stators to a factorial of 2, there are no extra pairs of auxiliary tee spares, and therefore it is possible to eliminate an increase in cogging due to auxiliary teeth.

In the first embodiment, the slot combination of the motor 40 (the rotor 20 and the stator 30) is not shown, but the slot combination of the motor 40 is not particularly limited. For example, the slot combination of the motor 40 may be 2: 3, 4: 3, 8: 9, or the like.

Embodiment 2. FIG.
In previous Embodiment 1, the space | interval (n: 1 or more integer) of auxiliary teeth n-order pair is
Magnetic pole pitch * h + magnetic pole pitch / 2 / n * m (h, m: integer)
The case of having the relationship has been described. On the other hand, in this Embodiment 2, the space | interval of auxiliary teeth n-order pair is
Magnetic pole pitch * h + magnetic pole pitch / 2 / (N−n) * m
(H, m: integer, N: maximum pair order)
Have the relationship.

More specifically, in the case of providing four stators 30a to 30d as in the first embodiment, in the configuration of the second embodiment, θ1 is set to the magnetic pole pitch * h + the magnetic pole pitch / 6. * M (h, m: integer), ψ1 is the magnetic pole pitch * h + magnetic pole pitch / 4 * m (h, m: integer), and the pair of auxiliary teeth pair (stator pair pair) is the magnetic pole pitch * h + The magnetic pole pitch is 2 * m (h, m: integer). Other configurations are the same as those of the first embodiment.

With this configuration, higher-order cogging that requires positional accuracy can be suppressed without the influence of assembly tolerances.

As described above, according to the second embodiment, the cogging 2 * n-order component can be suppressed by the (Nn) -order pair, and the high-order cogging component is suppressed by the low-order pair. The influence of assembly tolerances on suppression can be reduced.

Embodiment 3 FIG.
In the third embodiment, a case where auxiliary tee spares having two different arrangements are installed in one stator core will be described. FIG. 6 is an explanatory diagram of the shape of the stator core of the fan motor according to the third embodiment of the present invention. 6A and 6B show stator cores having the same θ1 defined in FIG. 2 but different φ1.

In the first embodiment, the case where the stator core 31 having one kind of auxiliary tee spare as shown in FIG. 6C is formed and used (the same shape in the axial direction) has been described. On the other hand, in the third embodiment, two types of shapes shown in FIGS. 6A and 6B are used, and the upper half in the axial direction is the shape (a) and the lower half is the shape (b). Thus, as shown in FIG. 6D, auxiliary tee spares having two different arrangements are installed in one core.

Normally, when 2 ^ n stators are used, only n cogging components can be suppressed. However, as shown in FIG. 6D, (n + 1) cogging components are suppressed by stacking two types of auxiliary teeth with different arrangements in the direction of the rotation axis in one stator 30. be able to. If the number of auxiliary tea spares arranged in the rotation axis direction is increased from two, the number of components that can be further suppressed can be increased.

As described above, according to Embodiment 3, the cogging frequency component to be suppressed can be increased by using a plurality of auxiliary tee spares arranged in the rotation axis direction and having different arrangements in one stator. The effect of assembly tolerances can be reduced.

Embodiment 4 FIG.
The case where cogging of the fourth-order component is suppressed using the two stators 30 in the first embodiment has been described. On the other hand, in the fourth embodiment, a case will be described in which cogging of the fourth-order component is suppressed using three or more stators 30.

FIG. 7 is a front view and a positional relationship diagram showing the stator of the fan motor according to the fourth embodiment of the present invention. FIG. 7A is a front view showing a fan motor according to the fourth embodiment. The components and the like are the same as those of the first embodiment, but the number of stators is three and the housing shape is substantially triangular. There are some differences from the first embodiment.

FIG. 7B shows the definition of the auxiliary teeth spacing at both ends of the stator as in the first embodiment, and a description thereof will be omitted. In the three stators 30a to 30c in the fourth embodiment, θ1 is the same, and the interval for suppressing the cogging secondary component is θ1 = magnetic pole pitch * h + magnetic pole pitch / 2 * m (h, m: integer)
Is set.

Further, φ1 is different among the three stators, and φ1a in the stator 30a, φ1b in the stator 30b, and φ1c in the stator 30c are set to be the following equations, respectively.
φ1a = magnetic pole pitch * h + magnetic pole pitch / 3 * m
φ1b = magnetic pole pitch * h + magnetic pole pitch / 3 * 2 * m
φ1c = magnetic pole pitch * h + magnetic pole pitch / 3 * 3 * m
= Magnetic pole pitch * h + Magnetic pole pitch * m
(H, m: integer)

FIG. 7 (c) is a stator position relationship diagram of the fan motor according to the fourth embodiment of the present invention. The distance from the common reference position to the auxiliary teeth 35 at one end of each of the stators 30a to 30c is β1, It is shown as β2 and β3. In the fourth embodiment, the angles between the V-phase teeth are symmetric with respect to 120 °, but the auxiliary teeth are deviated, so that β1 ≠ β2 ≠ β3.

In the fourth embodiment, such a configuration suppresses the cogging quaternary component in a group of three auxiliary tee spares. As described above, according to the configuration in which the cogging quaternary component is suppressed as a combination of three, the stator core manufacturing tolerance and assembly tolerance can be reduced as compared with the case of suppressing with two pairs as described in the first embodiment. It is possible to reduce the influence on the position shift of the auxiliary teeth.

Note that the number of stator combinations is not limited to three, and can be four or more. In addition, it is possible to suppress the sixth-order component by forming a group of auxiliary tooth pair groups in the same way as the pair of auxiliary tooth pairs described in the first embodiment. .

As described above, according to the fourth embodiment, an n-order group is configured by a plurality of auxiliary teeth of three or more, and n cogging frequency components are suppressed. Auxiliary teeth can be eliminated.

Claims

The wings,
Two or more having a rotor provided on the outer peripheral portion of the blade portion, a tooth provided on the outer peripheral side of the rotor via a gap, and an auxiliary tooth provided on both ends of the tooth. A motor including a stator of
A fan motor including a polygonal housing arranged to cover the outer periphery of the stator and the rotor,
The distance between the auxiliary teeth arranged at both ends in one stator is defined as the interval between the auxiliary teeth primary pair, and the distance between the auxiliary teeth primary pair of the two stators is defined as the distance between the auxiliary teeth secondary pair. In the same manner, when the interval of the n-th order pair of auxiliary teeth (n is an integer of 1 or more) is defined, the arrangement of the auxiliary teeth in each of the two or more stators is shifted to change the shape of each stator. The fan motor is characterized in that the cogging 2 * n-order component is suppressed by setting a desired interval for each auxiliary tooth n-order pair.
The fan motor according to claim 1,
The interval between the auxiliary teeth n-order pair is
Magnetic pole pitch * h + magnetic pole pitch / 2 / n * m
(H, m: integer)
The fan motor characterized by being.
The fan motor according to claim 1,
The interval between the auxiliary teeth n-order pair is
Magnetic pole pitch * h + magnetic pole pitch / 2 / (N−n) * m
(H, m: integer, N: maximum pair order)
The fan motor characterized by being.
The fan motor according to any one of claims 1 to 3,
A fan motor comprising a plurality of auxiliary teeth having different arrangements in a rotation axis direction in one stator.
The fan motor according to any one of claims 1 to 4,
The fan motor, wherein the number of stators is a factorial of 2.
The wings,
Two or more rotors provided on the outer peripheral portion of the blade portion, and two or more teeth disposed on the outer peripheral side of the rotor via a gap and provided on the inner peripheral surface and auxiliary teeth provided on both ends of the teeth A motor including a stator of
A fan motor including a polygonal housing arranged to cover the outer periphery of the stator and the rotor,
The distance between the auxiliary teeth arranged at both ends in one stator is defined as the distance between the auxiliary teeth primary group, and the distance between the auxiliary teeth primary groups of the three stators is the distance between the auxiliary teeth secondary group. In the same manner, when the interval of the n-th group of auxiliary teeth (n is an integer of 1 or more) is defined, the arrangement of the auxiliary teeth in each of the three or more stators is shifted to change the shape of each stator. The fan motor is characterized in that the cogging 2 * n-order component is suppressed by setting a desired interval for each n-th group of auxiliary teeth.
The wings,
Two or more having a rotor provided on the outer peripheral portion of the blade portion, a tooth provided on the outer peripheral side of the rotor via a gap, and an auxiliary tooth provided on both ends of the tooth. A motor including a stator of
A fan motor manufacturing method comprising: a polygonal housing arranged so as to cover an outer peripheral side of the stator and the rotor,
The distance between the auxiliary teeth arranged at both ends in one stator is defined as the interval between the auxiliary teeth primary pair, and the distance between the auxiliary teeth primary pair of the two stators is defined as the distance between the auxiliary teeth secondary pair. In the same manner, when the interval of the auxiliary tooth n-order pair (n is an integer of 1 or more) is defined in the same manner, a desired interval is set for each of the auxiliary tooth n-order pairs, so that the cogging 2 * n-order To suppress the ingredients,
Shifting the arrangement of auxiliary teeth in each of the two or more stators to form the two or more stators having different shapes;
And disposing the two or more formed stators in the polygonal housing so as to have the gap on the outer peripheral side of the rotor. A method of manufacturing a fan motor, comprising: