JP7193422B2 - Rotating electric machine and manufacturing method of rotating electric machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial gap type rotating electric machine used as an electric motor or a generator, and a method for manufacturing the axial gap type rotating electric machine.

There is a strong demand from the market for rotating electric machines to be lighter, thinner, shorter, and smaller, and recently, as a countermeasure against global warming, there is an increasing demand for energy saving and high efficiency. Furthermore, low vibration, low noise, and low cost are also strongly required. Among them, the axial gap type rotary electric machine, which has an air gap in the direction of the rotation axis, has an advantageous structure for being flat and thin. This type of rotating electric machine has been attracting attention in recent years because it is also suitable for variable speed operation.

However, compared to the radial gap type electric rotating machine, it is difficult to make the air gap small, and thus there are problems from the viewpoint of high torque and high efficiency.

Here, rotary electric machines are roughly classified into radial gap type and axial gap type. In the conventional general radial gap type rotary electric machine, a brushless DC motor (hereinafter referred to as a BLDC motor) using a permanent magnet for the rotor, a synchronous generator, or a rotor having magnetic teeth without using a permanent magnet Switched reluctance motors (hereinafter referred to as "SR motors") are constructed by laminating a stator iron core with silicon steel plates, and when emphasizing low cost and assembly efficiency, a concentrated winding system is adopted for the windings. . The reason for this is that with the distributed winding method, the coil ends that do not contribute to torque generation become large, which increases copper loss and reduces efficiency. , the wire can be wound directly into the slot, and the cost of the wire can be reduced.

As a method for pursuing high efficiency of a rotating machine, the following prior art, Japanese Patent Application Laid-Open No. 2002-200302, is known, which uses means for increasing the facing area of the air gap portion between the stator and the rotor. The rotary electric machine described in Patent Document 1 discloses an example in which the SR motor described above is configured as a radial gap type to achieve high torque. A rotary electric machine is configured by meshing the unevenness. Therefore, the substantial opposing area of the air gap is increased, and the efficiency and torque of the rotating electrical machine can be increased.

On the other hand, a rotating electrical machine of the axial gap type having an air gap in the axial direction, in which concentric unevenness is provided in the air gap to facilitate assembly, is known as the rotating electrical machine described in Patent Document 2. . The rotating electric machine described in Patent Literature 2 is inexpensive and can obtain high torque.

WO2010/116921 JP 2013-150543 A

However, since the air gap of the rotating electric machine described in Patent Document 1 is not linear, it is not possible to complete the stator and rotor separately and insert the rotor into the stator to assemble. Therefore, it takes more time to complete the assembly, including the winding work, compared to a normal air-gap rotating electric machine that is linear in the axial direction, resulting in a high manufacturing cost. In addition, compared with a BLDC motor that uses permanent magnets, an SR motor consumes more current than a BLDC motor because the rotor field is created by the winding current of the stator. is proportional to the square of the current, resulting in a rotating electric machine that is more difficult to control than a BLDC motor that is proportional to the current.

In addition, as described in Patent Document 2, those using permanent magnets require three parts, a rotor core, permanent magnets, and a back yoke, as well as a rotating shaft, as elements constituting a rotor, which increases the cost. had the problem of increasing

Furthermore, FIG. 9 is a diagram showing a rotor used in a conventional rotating electric machine of the axial gap type. As shown in FIG. Since the body tooth portion 25 is made of a magnetic material and has a permanent magnet 26 and a back yoke 27, the concentric magnetic tooth portion 25 made of a magnetic material is indispensable in consideration of the magnetizing means. has become complicated and the rotating electric machine has become expensive. This is because the magnetic tooth portion 25 is indispensable because the magnetic flux does not pass in the radial direction in the concave-convex gap when the magnetic tooth portion 25 is not used.

Furthermore, as shown in FIG. 10, in the configuration of the conventional unipolar magnet rotor provided with stators on both sides, two magnetic tooth portions 25 are required, and the rotating shaft 7 is made of a non-magnetic material. Since it is necessary to be, it has become expensive by that much.

Therefore, the present invention has been made in view of the above problems, and is a BLDC motor that uses permanent magnets in an axial gap type rotating electric machine in which the air gap has a concavo-convex mesh configuration. , Axial-gap type electric rotating machine, which is composed only of permanent magnets except for the rotating shaft, shortens the assembly time, and can be significantly less expensive than conventional electric rotating machines, and a manufacturing method of the rotating electric machine. intended to provide

A rotary electric machine according to the present invention includes a stator having a winding axis in the axial direction and having winding core portions having m salient poles distributed in the circumferential direction, and a rotor having a rotating shaft. and an axial gap type rotary electric machine having a gap in a rotation axis direction between the stator and the rotor, wherein the winding iron core portion is concentrically arc-shaped on a surface facing the rotor with an air gap. The rotor has one or more stator teeth in the axial direction, and the rotor is composed of permanent magnets having magnetic flux in the axial direction and magnetic flux split in the radial direction in portions facing the stator teeth, and one or more permanent magnet teeth concentrically and axially corresponding to the stator teeth in a portion facing the stator teeth via an air gap, and the stator teeth and the permanent magnet teeth mutually The concave and convex are arranged so as to mesh with each other and are rotatably opposed to each other. However, m is an integer of 2 or more.

Moreover, in the rotating electric machine according to the present invention, it is preferable that the permanent magnet is made of a magnetic material having a coercive force of 2000 Oersted or less.

Also, in the rotating electric machine according to the present invention, it is preferable that the permanent magnets are composed of alnico magnets, iron-chromium-cobalt magnets, or bond magnets, and are directly fixed to the rotating shaft.

Further, a method for manufacturing a rotating electric machine according to the present invention includes a stator having a winding shaft in an axial direction and having winding core portions having m salient poles distributed in a circumferential direction, and a rotating shaft. A gap is provided between the stator and the rotor in the rotation axis direction, and the winding iron core portion is concentrically arcuate and axially spaced on the surface facing the air gap with the rotor. The rotor has one or more stator teeth in the rotor, and the rotor is composed of permanent magnets having magnetic flux in the axial direction and magnetic flux shunted in the radial direction in the portion facing the stator teeth, and through an air gap and has one or more permanent magnet teeth concentrically corresponding to the stator teeth in the portion facing the stator teeth, and the stator teeth and the permanent magnet teeth are concave and convex with respect to each other. are arranged so as to engage with each other and rotatably face each other, wherein the permanent magnet includes a magnetic yoke having concentric arcuate concavities and convexities in the axial direction corresponding to the permanent magnet teeth. It is characterized in that it is magnetized in consideration of the balance of permeance in the radial direction and the axial direction, facing each other so as to mesh with the magnet teeth. However, m is an integer of 2 or more.

Another method for manufacturing a rotating electric machine according to the present invention includes a stator having a winding axis in the axial direction and having winding core portions having m salient poles distributed in the circumferential direction; A gap is provided between the stator and the rotor in the direction of the rotation axis, and the winding iron core is concentrically arc-shaped on the surface facing the rotor with the air gap The rotor has one or more stator teeth in the axial direction, and the rotor is composed of permanent magnets having a magnetic flux in the axial direction and a magnetic flux split in the radial direction at portions facing the stator teeth, and an air gap. has one or more permanent magnet teeth concentrically and axially corresponding to the stator teeth in a portion facing the stator teeth, and the stator teeth and the permanent magnet teeth are recessed from each other A method of manufacturing a rotating electric machine, wherein the permanent magnets are concentric arc-shaped magnetic yokes having unevenness in the axial direction corresponding to the permanent magnet teeth. 2. In the manufacturing process of the permanent magnets, the permanent magnets are molded so as to mesh with the teeth of the permanent magnets, and are oriented in an anisotropic magnetic field. However, m is an integer of 2 or more.

Another method for manufacturing a rotating electric machine according to the present invention includes a stator having a winding axis in the axial direction and having winding core portions having m salient poles distributed in the circumferential direction; A gap is provided between the stator and the rotor in the direction of the rotation axis, and the winding iron core is concentrically arc-shaped on the surface facing the rotor with the air gap The rotor has one or more stator teeth in the axial direction, and the rotor is composed of permanent magnets having a magnetic flux in the axial direction and a magnetic flux split in the radial direction at portions facing the stator teeth, and an air gap. has one or more permanent magnet teeth concentrically and axially corresponding to the stator teeth in a portion facing the stator teeth, and the stator teeth and the permanent magnet teeth are recessed from each other and rotatably opposed to each other, wherein the magnetization direction of the permanent magnet is unipolar magnetization in the axial direction, and after assembling the rotating electrical machine, , is magnetized from the outside. However, m is an integer of 2 or more.

According to the axial gap type rotating electrical machine and the manufacturing method of the rotating electrical machine according to the present invention, the opposing surfaces of the air gap between the stator teeth and the permanent magnet teeth mesh and face each other. A large and highly efficient rotary electric machine can be realized.

Further, according to the axial gap type rotating electric machine and the manufacturing method of the rotating electric machine according to the present invention, since the stator teeth and the permanent magnet teeth are concentrically meshed with each other, the rotor does not need magnetic rotor teeth. Therefore, the rotor can be manufactured at low cost, and the rotor can be easily assembled by inserting the rotating shaft into the bearing of the stator. In addition, since a magnetic path of magnetic flux is formed between the stator and rotor through the radial air gap of the concave and convex portions, the axial attraction force between the stator and rotor can be greatly reduced, resulting in less stress on the bearings. A long-life rotary electric machine can be obtained.

Further, according to the axial gap type rotating electric machine and the manufacturing method of the rotating electric machine according to the present invention, the stator is arranged on both sides of the rotor, or by arranging the rotor on both sides of the stator, a small size and high efficiency can be achieved. rotating electric machine.

Further, according to the axial gap type rotating electric machine and the manufacturing method of the rotating electric machine according to the present invention, since the permanent magnets of the rotor are directly provided with unevenness, there is no need for the teeth of a magnetic material as in the conventional art, and the magnetic teeth are not required. If a permanent magnet with a small force is used, a back yoke becomes unnecessary and a more inexpensive rotating electric machine can be realized.

1 is a cross-sectional view including a rotary shaft of a rotary electric machine according to an embodiment of the present invention; A view of the rotor in FIG. 1 viewed from the axial direction Principle diagram of magnetizing a permanent magnet for a rotor of a rotary electric machine according to an embodiment of the present invention FIG. 2 is a diagram of a rotor using a unipolar magnet of a rotary electric machine according to an embodiment of the present invention, in which stators are provided on both sides; FIG. 4 is a diagram of a rotor of another rotating electrical machine according to an embodiment of the present invention; A diagram showing a double-sided gap configuration that is a modification of another rotating electrical machine according to an embodiment of the present invention. FIG. 2 is a diagram of the flow of magnetic flux by the virtual magnetic path method of the rotary electric machine according to the embodiment of the present invention; 1 is an exploded perspective view of a rotary electric machine according to an embodiment of the present invention; Diagram showing a prior art rotor Prior art unipolar magnet rotor with stators on both sides

Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the solution of the invention. .

1 is a cross-sectional view including a rotating shaft of a rotary electric machine according to an embodiment of the present invention, FIG. 2 is a view of the rotor in FIG. 1 as seen from the axial direction, and FIG. FIG. 4 is a principle diagram of magnetizing a permanent magnet for a rotor of a rotary electric machine according to an embodiment, and FIG. FIG. 5 is a diagram of a rotor of another rotating electric machine according to the embodiment of the present invention; FIG. 7 is a diagram showing the flow of magnetic flux by the virtual magnetic path method of the rotating electric machine according to the embodiment of the present invention; FIG. 8 is an exploded perspective view of the rotating electric machine according to the embodiment of the present invention; It is a diagram.

An example of a rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. In addition, in FIG. 1, the lower half of the figure from the axis center line is omitted. The stator 1 is made of a magnetic material and has a winding iron core 1-1 having m salient poles protruding in the axial direction. A fixed stator tooth 2 is formed. The number of teeth of the stator teeth 2 is not limited to 3 and can be changed arbitrarily. The coils 3 are arranged on the axially left side of the stator teeth 2 on m winding core portions 1-1 protruding in the axial direction of the stator 1. As shown in FIG.

The rotor 4 is a member made of a permanent magnet, fixed to a rotating shaft 7 by a permanent magnet flange 6 or the like, and rotatably supported by a bearing 8 . Permanent magnet teeth 5 are formed in a portion of the rotor 4 facing the stator 1 in the axial direction. They are opposed to each other while maintaining an air gap so as to mesh with the stator teeth 2 which are mounted.

FIG. 2 shows an example of quadrupole magnetization, in which the permanent magnet teeth 5 are provided at four positions, vertical and horizontal, and are magnetized to N, S, N, and S in order in the circumferential direction. In this case, if FIG. 1 and FIG. 8 show a three-phase machine, as a typical example, m=6 and six winding core portions 1-1, 1-2, 1-3, 1-4, 1-5 and 1-6 are provided, and the windings are sequentially wound to the U, V, W, U, V, W phases.

The bracket 22 is fixed to the stator 1 and supports the rotating shaft 7 with the bearing 8 together with the stator 1 . The rotary electric machine in this embodiment forms an axial gap type rotary electric machine with such a configuration. In FIGS. 1 and 2, the rotor 4 is shown as being composed of a single permanent magnet. Although illustration is omitted, for example, in FIG. The non-provided part, ie, the 45° line between the vertical and horizontal lines divides the four parts into four, and the above-mentioned four substantially fan-shaped parts N, S, N, S are adhered or fastened to the magnetic disk and fixed to the rotating shaft 7. You may That is, it is sufficient that the stator teeth 2 of the stator 1 and the permanent magnet teeth 5 of the rotor 4 are engaged with each other.

Such a configuration realizes a rotating electric machine having the following advantages. That is, since the air gap facing surfaces between the stator teeth 2 and the permanent magnet teeth 5 are meshed and facing each other, the facing area increases. As a result, the permeance of the air gap can be increased, resulting in a highly efficient rotary electric machine. This is because most of the magnetomotive force through which the magnetic flux passes is consumed in the air gap, but according to the rotary electric machine according to the present embodiment, since the permeance in the air gap can be increased, the consumption of the magnetomotive force in this portion is small. This is because

In addition, the rotating electric machine according to the present embodiment is an axial gap type rotating electric machine, and since the stator teeth 2 of the stator 1 and the permanent magnet teeth 5 of the rotor 4 mesh concentrically, the rotor 4 has its shaft fixed. Since it can be easily assembled by inserting it into the bearing of the child, an inexpensive and highly efficient rotary electric machine is realized. With such a configuration, a so-called three-dimensional air gap type axial gap BLDC motor is realized. In this case, it is necessary for the magnetic flux in the air gap to pass not only in the axial direction but also in the radial direction in the portion where the concave and convex portions are meshed. Means for this will be described later.

In general, axial gap motors have a larger magnetic attraction force in the axial direction than radial gap motors, and have the drawback of applying stress to the bearings. Therefore, the magnetic attraction force in the axial direction, which is the drawback, is greatly improved.

In this case, the meshing tooth profile is not limited to the illustrated rectangular shape, but may be a triangular shape or an arcuate curve, as long as the opposing surface property is increased compared to the planar opposing shape and the shape is rotatable in the circumferential direction. In this case, manufacturing of the stator 1 and the stator teeth 2 is considerably difficult with the lamination type of silicon steel plates, but it can be easily manufactured with compacted powder. In addition, the winding core portions 1-1 protruding in the axial direction of the stator 1 are often 6 poles in a simple structure in a 3-phase machine. Practically, it is suitable for 2, 4, 8 and 12 poles in 2 phases, 3, 6, 9, 12 and 18 poles in 3 phases, and 5 and 10 poles in 5 phases. be. In general, the number of stator poles m should be a positive integer of 2 or more. In the examples of FIGS. 1 and 2, the number of rotor poles is shown as 4 on the assumption that m=6, as described above.

FIG. 3 is an example of a principle diagram of magnetizing the rotor magnet of the present invention, which is applicable to the embodiments of the rotary electric machines shown in FIGS. 1 to 2, 5, 6, and the like. As shown in FIG. 3, the magnetizing yoke 9 is made of a magnetic material and has teeth 12-1 that are concentrically provided with concavities and convexities. The permanent magnet 10 is a permanent magnet used in the rotating electric machine according to the present embodiment, and has a tooth portion 11 in which unevenness similar to that of the permanent magnet tooth 5 is provided concentrically. When the tooth portion 11 of the permanent magnet 10 is engaged with the magnetizing yoke 9 and the permanent magnet 10 is inserted, an air gap 12 of an appropriate size is formed between the permanent magnet 10 and the tip of the tooth 12-1. placed.

A magnetizing coil 13 is wound around the outer periphery of the magnetizing yoke 9, and the permanent magnet 10 is magnetized by passing a large current in a short period of time. However, since the magnetic flux that magnetizes the permanent magnet 10 passes through a portion with a large permeance, the permanent magnet is magnetized. However, if an air gap 12 is provided between the magnetizing yoke 9 and the permanent magnet 10, the magnetic resistance of the air gap 12 increases, and as shown by the dotted arrow in FIG. Magnetic fluxes Φ ₂ to Φ ₄ and magnetic fluxes Φ ₆ to Φ ₇ other than Φ ₁ and Φ ₅ pass through and are magnetized. That is, it is characterized by appropriately providing an air gap or the like and performing magnetization in consideration of the balance of permeance in the radial direction and the axial direction at the time of magnetization. If an alnico magnet, an iron-nickel-cobalt magnet, or the like with a small coercive force of the permanent magnet 10 is used, the magnetization becomes even easier. Furthermore, if a diamagnetic material such as copper is inserted into the air gap 12, the effect is further enhanced.

According to such a magnetization method, the magnetic flux passing through the tooth portion 11 is generated not only in the axial direction (Φ ₁ , Φ ₃ Φ ₅ and Φ ₇ ) but also in the radial direction of the meshing portion between the tooth portion 11 and the tooth 12-1. Since the magnetic flux also passes through (Φ ₂ , Φ ₄ and Φ ₆ ), the total amount of magnetic flux passing through the permanent magnet 10 increases, thereby achieving high torque.

Although FIG. 3 has been described as a means of magnetization, it can also be applied to the case of anisotropically orienting the magnetic field in the process of manufacturing the permanent magnet 10 . For example, the air gap 12 shown in FIG. or fluid. Injection type or compression type resin-molded magnets, so-called bond magnets, may also be used. That is, if the teeth 11 of the permanent magnet 10 are magnetically oriented in the radial direction, the teeth 11 are also magnetized in the radial direction, and the function of the electric rotating machine according to the present embodiment is exhibited. . Alnico cast magnets and iron-chromium-cobalt magnets having a coercive force of 2000 Oersted or less are suitable for the permanent magnets used in the rotating electric machine according to the present embodiment. In particular, when iron-chromium-cobalt magnets are used, the teeth 11 of the permanent magnet 10 can be manufactured by cold forging, resulting in robustness and low cost. In addition, fixing to the rotary shaft 7 can be performed by press fitting instead of adhesion.

The magnetization of the permanent magnet is not limited to magnetization by fitting the magnetization yoke 9 to the permanent magnet 10, and so-called assay magnetization may be performed. More specifically, in the case where the magnetization direction of the permanent magnet used in the rotor 4 is unipolar magnetization in the axial direction, for example, as in a hybrid stepping motor, the permanent magnet has a coercive force of 2000 Oersted. The permanent magnet teeth 5 of the stator 1 and the rotor 4 are magnetized from the outside in the axial direction after the rotating electric machine is assembled. Because of the uneven meshing through the air gap, according to the permeance determined by the facing area and the gap length, the magnetic lines of force of magnetization pass not only in the axial direction of the air gap, but also in the radial direction, and the permanent magnet teeth 5 move in the axial direction. and radially magnetized.

FIG. 4 shows a modification of the rotary electric machine according to the present embodiment, in which a unipolar magnet rotor is provided with stators on both sides. A stator 1 and coils 3 similar to those shown in FIG. This is an axial gap rotary electric machine in which a permanent magnet rotor 14 is provided with unevenness in a double gap manner. In this case, a unipolar magnetization rotor is also possible with this configuration, like the rotor of a hybrid stepping motor. That is, the permanent magnet rotor 14 is magnetized in the axial direction, for example, with N polarity on the left side and S polarity on the right side. In this case, instead of magnetizing the rotor alone, if the motor is assembled and then magnetized in the axial direction, the air gaps in the radial and axial directions are selected to appropriate values, and the gap permeance is adjusted to automatically It will also be magnetized in the radial direction. The rotating electric machine according to the present embodiment has a rotating shaft 7 and bearings 8 as in the rotating electric machine shown in FIG. and a back yoke/housing 15 of a unipolar magnetized rotor axially communicating with the . In this case, FIG. 4 showing the rotating electrical machine according to the present embodiment corresponds to the advanced configuration of the prior art shown in FIG. 10, but the rotating electrical machine shown in FIG. The magnetic teeth 25 are required, and the material of the rotating shaft 7 must be non-magnetic in order to prevent magnetic short-circuiting of the permanent magnets 28 . In contrast, according to the configuration of the rotary electric machine according to the present embodiment, the material of the rotating shaft 7 shown in FIG. 4 need not be non-magnetic. As a result, the degree of freedom in material selection is increased, and costs can be reduced.

FIG. 5 shows another modification of the rotary electric machine according to the present embodiment, and shows a rotor having a structure different from that of the rotor described above. In the rotating electrical machine described above, the rotor 4 has been described in FIG. 2 for the case where the four poles are formed by integral magnets, but as shown in FIG. As a body, the back yoke 16 may be fixed, and the back yoke 16 may be fixed to the rotating shaft 7 . Furthermore, as shown in FIG. 5, a configuration having a back yoke 16 may be employed.

FIG. 6 illustrates another modification of the rotating electrical machine according to the present embodiment, and is a cross-sectional view of the rotating electrical machine having a double-sided gap structure. The coil portion 21 is provided with uneven air gaps on both sides, and the rotors shown in FIG. 2 or FIG. 5 are arranged on both sides. In this case, since the m winding core portions 20 are separated into m pieces, they are formed integrally by casting a non-magnetic material such as resin or the like.

FIG. 7(a) is a diagram showing the flow of interlinkage magnetic flux from the rotor 4-1 made of permanent magnets of the rotating electric machine according to the present embodiment by the virtual magnetic path method. It can be seen that in addition to the magnetic fluxes Φ ₁ , Φ ₃ and Φ ₅ that go straight in the axial direction, magnetic fluxes Φ ₂ and Φ ₄ that also pass through the radial air gap of the uneven portion are added. The magnetic fluxes Φ ₂ and Φ ₄ passing through the radial air gap are due to the magnetization effect of the permanent magnet magnetization method used in the rotating electric machine according to the present embodiment shown in FIG. 3 .

On the other hand, as shown in FIG. 7B, in a conventional axial gap type rotating electrical machine with uneven air gaps, which does not use the manufacturing method of the rotating electrical machine according to the present embodiment, a rotor 4-1 made of permanent magnets is used. Similarly, as shown in FIG. 7(b) by the virtual magnetic path method, the flow of the interlinkage magnetic flux from is only the magnetic fluxes Φ ₁ , Φ ₃ and Φ ₅ that go straight in the axial direction, and the interlinkage magnetic flux is shown in FIG. 7(a ), the torque is also reduced.

Next, desirable coercive force values of permanent magnets used in the rotary electric machine according to this embodiment are shown.
_Hm≈ (B/ _μ0 )·(Lg/Lm) (1)
In the case of the rotary electric machine according to this embodiment, the equation (1) holds from the magnetic circuit equation. Here, H _m : magnetic field strength of permanent magnet “A/m”, Lm: effective magnet thickness “m”, B: air gap magnetic flux density “T”, μ ₀ : magnetic permeability of air gap “H/m ”, Lg: Air gap length “m”.

The magnetic flux density of the stator teeth and the air gap magnetic flux density B are the same, and the saturation magnetic flux density is about 2 "T" when the stator teeth are composed of dust cores, etc. Considering cost performance, ( Lg/Lm)≈1/10 If the magnetic circuit is designed, from the equation (1), H _m ≈0.016×10 ⁷ ≈2000 Oe.

FIG. 8 is an exploded perspective view of the rotating electrical machine according to the present embodiment, and reference numerals indicating respective components are assigned the same reference numerals as those of the rotating electrical machine described above. The rotor 4 is composed only of permanent magnets, and the stator 1 is composed of m=6 core portions for windings having 1-1 to 1-6.

The axial gap type rotary electric machine according to the present invention can be used as an electric motor or a generator, and is inexpensive, robust, light, thin, short and small, suitable for high torque and high efficiency, and extremely practical. Therefore, it is expected to make a great contribution industrially.

1 Stator 1-1, 1-2, 1-3, 1-4, 1-5, 1-6, 20 Winding core 2, Stator teeth 5, 11, Permanent magnet teeth 6, Permanent magnet teeth Collars 3, 13, 21, coils 4, 4-1, 14 permanent magnet rotor 7, rotating shaft 8, bearing 22, brackets 15, 16 back yoke 9, magnetizing yoke 12, air gap 25, magnetic tooth portion

Claims (6)

A stator having a winding axis in the axial direction and in which winding core portions having m salient poles are distributed in the circumferential direction; An axial gap type rotating electric machine having a gap in the rotation axis direction between the elements,
The winding core portion has one or more stator teeth concentrically in an axial direction on a surface facing the air gap with the rotor,
The rotor includes permanent magnets having axial magnetic flux and radial magnetic flux in a portion facing the stator teeth, and an air gap between the rotor teeth and the stator teeth. one or more concentric axial permanent magnet teeth corresponding to the stator teeth;
A rotary electric machine, wherein the stator teeth and the permanent magnet teeth are rotatably opposed to each other with recesses and protrusions meshing with each other. However, m is an integer of 2 or more. In the rotary electric machine according to claim 1,
A rotary electric machine, wherein the permanent magnet is made of a magnetic material having a coercive force of 2000 Oersted or less. In the rotary electric machine according to claim 1,
A rotary electric machine, wherein the permanent magnet is composed of an alnico magnet, an iron-chromium-cobalt magnet, or a bond magnet, and is directly fixed to the rotating shaft. A stator having a winding axis in the axial direction and in which winding core portions having m salient poles are distributed in the circumferential direction; having a gap in the direction of the rotation axis between the children,
The winding core portion has one or more stator teeth concentrically in an axial direction on a surface facing the air gap with the rotor,
The rotor includes permanent magnets having axial magnetic flux and radial magnetic flux in a portion facing the stator teeth, and an air gap between the rotor teeth and the stator teeth. one or more concentric axial permanent magnet teeth corresponding to the stator teeth;
A method for manufacturing a rotating electric machine in which the stator teeth and the permanent magnet teeth are arranged so that concaves and convexes are engaged with each other and are rotatably opposed to each other,
The permanent magnet is arranged such that a magnetic yoke having concentric arc-shaped undulations in the axial direction corresponding to the permanent magnet teeth is opposed to the permanent magnet teeth so as to mesh with each other, so that the balance of permeance in the radial direction and the axial direction is taken into consideration. A method of manufacturing a rotating electric machine, characterized in that magnetization is performed according to the following. However, m is an integer of 2 or more. A stator having a winding axis in the axial direction and in which winding core portions having m salient poles are distributed in the circumferential direction; having a gap in the direction of the rotation axis between the children,
The winding core portion has one or more stator teeth concentrically in an axial direction on a surface facing the air gap with the rotor,
The rotor includes permanent magnets having axial magnetic flux and radial magnetic flux in a portion facing the stator teeth, and an air gap between the rotor teeth and the stator teeth. one or more concentric axial permanent magnet teeth corresponding to the stator teeth;
A method for manufacturing a rotating electric machine in which the stator teeth and the permanent magnet teeth are arranged so that concaves and convexes are engaged with each other and are rotatably opposed to each other,
In the permanent magnet, a magnetic yoke having a concentric arc shape corresponding to the permanent magnet teeth and having unevenness in the axial direction is opposed to the permanent magnet teeth in the manufacturing process of the permanent magnet so as to engage with the teeth. A method for manufacturing a rotating electric machine, characterized in that a polarizing magnetic field is oriented. However, m is an integer of 2 or more. A stator having a winding axis in the axial direction and in which winding core portions having m salient poles are distributed in the circumferential direction; having a gap in the direction of the rotation axis between the children,
The winding core portion has one or more stator teeth concentrically in an axial direction on a surface facing the air gap with the rotor,
The rotor includes permanent magnets having axial magnetic flux and radial magnetic flux in a portion facing the stator teeth, and an air gap between the rotor teeth and the stator teeth. one or more concentric axial permanent magnet teeth corresponding to the stator teeth;
A method for manufacturing a rotating electric machine in which the stator teeth and the permanent magnet teeth are arranged so that concaves and convexes are engaged with each other and are rotatably opposed to each other,
The magnetization direction of the permanent magnet is unipolar magnetization in the axial direction,
A method of manufacturing a rotating electrical machine, comprising: magnetizing the rotating electrical machine from the outside in the axial direction after assembly of the rotating electrical machine. However, m is an integer of 2 or more.

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