Axial gap motors, blowers, electrical equipment equipped with blowers, and fan modules

Abstract

To provide an axial gap motor in which a load caused by a magnetic attraction force is suppressed from being concentrated in a rotor connection point.SOLUTION: An axial gap motor includes a stator including a stator core having a stator winding wound therearound, a rotor holding a plurality of magnets which are arranged to face the stator in the circumferential direction, a fixed shaft extending through the center of the rotor and being fixed to the stator, a first bearing fixed to the fixed shaft, and an elastic member that gives an urging force to the first bearing. The stator core and the magnets are attracted to each other. The elastic member gives a force in a direction for moving the rotor and the stator away from each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an axial gap motor improved to relieve the thrust force applied to the bearing of the axial gap motor, a blower, an electric device provided with the blower, and a fan module.

Background Art

[0002] Regarding an axial gap motor, in the combination of a single rotor and a single stator, it is a motor in which a large thrust force due to the axial magnetic force acts on the bearing. To avoid this, by using a double rotor single stator or a single rotor double stator, the axial magnetic force can be canceled, and the thrust force applied to the bearing can be reduced or made zero.

[0003] However, the axial gap motor of a single rotor and a single stator has the advantage that it can be easily assembled. Moreover, the axial gap motor is a motor that can contribute to the miniaturization of the fan module. Since the axial gap motor can secure the air gap area in the direction of the rotation axis, it is a motor that can exhibit high torque even in a thin shape, and thus the miniaturization of a turbo fan type fan module can be achieved in particular.

[0004] Blowers such as air conditioners and ventilation fans generally have a configuration having a motor that holds a blower fan on one side. In Patent Document 1, the miniaturization of a blower is realized by using an axial gap motor.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Figure 7 is a schematic perspective view showing the overall configuration of a conventional blower 1. In the blower 1, the impeller 20 is mounted on the axial gap motor 2. The blower 1 is attached to a motor support member 30, which is part of the housing. In Figure 7, the impeller 20 has the shape of a turbo fan blade. The impeller 20 can also be used for a sirocco fan or an axial flow fan. Figure 8 is an exploded perspective view of Figure 7. The motor mounting member 30 is provided with an opening 31 to which the axial gap motor 2 can be mounted. The axial gap motor 2 fits into the opening 31, and the motor mounting member 40 and the motor mounting member 30 are tightened with screws, fixing the axial gap motor 2 to the motor mounting member 30.

[0007] Figure 9 is a schematic cross-sectional view showing the configuration of the axial gap motor 2 described in Patent Document 1. The axial gap motor 2 comprises a stator 3, a rotor 10, and a rotating shaft 50. The stator 3 and rotor 10 are positioned opposite each other with a gap in the direction of the rotating shaft 50. The rotor 10 and the rotating shaft 50 are joined together and rotate as a single unit. The rotor 10 faces the stator 3 and holds a plurality of magnets 11 arranged circumferentially with a gap between them.

[0008] The stator 3 comprises a stator winding 5, a stator core 4, and a stator base 17. The stator base 17 holds the first bearing 6 and the second bearing 7 located on the rotor 10 side. There is a gap between the first bearing 6 and the second bearing 7, which holds the rotor 10 on the rotating shaft 50 so that the rotor 10 does not vibrate. The stator 3 is joined to the top surface of the motor case 41, which is the housing of the Akisha gap motor 2, and is connected to the rotating shaft 50 via the first bearing 6 and the second bearing 7, so it does not rotate.

[0009] The rotor 10 is separated from the lower surface of the motor case 41 by a gap, allowing it to rotate. When a voltage is applied to the stator winding 5, a rotating magnetic field is generated from the stator core 4, and this rotating magnetic field causes the rotor 10 to rotate.

[0010] A magnetic attractive force acts between the magnet 11 and the stator core 4. This magnetic attractive force can reach, for example, 300 N. Patent Document 1 had the problem that the load due to the magnetic attractive force was concentrated at the point where the rotor 10 and the rotating shaft 50 were joined, causing damage to the rotor 10 and the rotating shaft 50. This disclosure aims to reduce the concentration of load due to magnetic attraction at the connection point with the rotor in an axial gap motor. [Means for solving the problem]

[0011] An axial gap motor according to one aspect of this disclosure is A stator including a stator core around which stator windings are wound, A rotor holding a plurality of magnets arranged circumferentially opposite the stator, A fixed shaft that penetrates the center of the rotor and is fixed to the stator, A first bearing fixed to the aforementioned fixed shaft, The first bearing comprises an elastic member that applies a biasing force to the first bearing, The stator core and the magnet are attracted to each other. The elastic member applies a force in a direction that moves the rotor and the stator apart.

[0012] An axial gap motor according to another aspect of this disclosure is: A stator including a stator core around which stator windings are wound, A rotor holding a plurality of magnets arranged circumferentially opposite the stator, A fixed shaft that penetrates the center of the rotor and is fixed to the stator, a first bearing fixed to the fixed shaft; a second bearing that is disposed on the stator side while being separated from the first bearing and is fixed to the fixed shaft; a first fixing member fixed to the fixed shaft; an elastic member disposed between the first bearing and the first fixing member; the rotor holds the second bearing at a central portion; one end of the elastic member contacts the first fixing member, and the other end of the elastic member contacts the first bearing, and the elastic member applies a force in a direction to move the first bearing away from the second bearing.

[0013] A casing module according to an aspect of the present disclosure includes: a rotor that holds a plurality of magnets arranged circumferentially facing a stator including a stator core around which a stator winding is wound; a fixed shaft that penetrates the center of the rotor and is joined to the stator; a first bearing joined to the fixed shaft; a second bearing that is disposed while being separated from the first bearing and is joined to the fixed shaft; a first fixing member joined to the fixed shaft; an elastic member that is disposed between the first bearing and the first fixing member and applies a biasing force to the first bearing; the rotor and an impeller joined to the first bearing; the rotor holds the second bearing at a central portion; one end of the elastic member contacts the first fixing member, and the other end of the elastic member contacts the first bearing, and the elastic member applies a force in a direction to move the first bearing away from the second bearing.

Advantages of the Invention

[0014] According to the axial gap motor of one aspect of the present disclosure, the blower including the axial gap motor, and the electric device including the blower, it is possible to reduce the concentration of the load due to the magnetic attractive force at the connection portion with the rotor. According to the fan module of one aspect of the present disclosure, it is possible to reduce the concentration of the load due to the magnetic attractive force at the connection portion with the rotor. Further, by using the fan module in which the impeller and the rotor are integrated, the assembly of the blower becomes easy.

Brief Description of Drawings

[0015] [Figure 1] It is a cross-sectional view schematically showing the configuration of the blower in Embodiment 1 which is one aspect of the present disclosure. [Figure 2] It is a principle diagram schematically showing the principle of the blower of Embodiment 1. [Figure 3] It is an exploded view schematically showing the configuration of the blower of Embodiment 1. [Figure 4] It is a cross-sectional view schematically showing the fan module of Embodiment 2. [Figure 5] It is a schematic cross-sectional view showing the blower incorporating the fan module of Embodiment 2. [Figure 6] It is a diagram schematically showing an electric device which is one aspect of the present disclosure. (a) is a perspective view schematically showing the whole of a four-way type indoor unit, and (b) is an exploded perspective view schematically showing the four-way type indoor unit. [Figure 7] It is a perspective view schematically showing the whole configuration of a conventional blower. [Figure 8] It is an exploded perspective view schematically showing the configuration of a conventional blower. [Figure 9] It is a cross-sectional view schematically showing the configuration of a conventional blower.

Modes for Carrying Out the Invention

[0016] More specific embodiments of the present disclosure are described below. However, some unnecessarily detailed descriptions may be omitted. For example, detailed descriptions of already well-known matters or redundant descriptions of substantially identical components may be omitted. This is to avoid the following description becoming unnecessarily verbose and to facilitate understanding for those skilled in the art. The inventors provide the accompanying drawings and the following description so that those skilled in the art can fully understand the present disclosure, and not to limit the subject matter described in the claims. In the following description, identical or similar components are denoted by the same reference numerals. (Embodiment 1)

[0017] A blower 1, which represents one aspect of this disclosure, will be described below with reference to the drawings. Figure 1 is a schematic cross-sectional view showing the configuration of the blower 1 of Embodiment 1. A schematic perspective view showing the overall configuration of the blower 1 of this disclosure is the same as that shown in Figure 7. The blower 1 comprises an axial gap motor 2 and a casing 23. The casing 23 comprises an impeller 20 and an impeller base 21, which generate airflow. The axial gap motor 2 comprises a stator 3, a rotor 10, and a fixed shaft 8. The stator 3 and rotor 10 are mounted around the fixed shaft 8. The stator 3 and rotor 10 face each other with a gap in the direction of the fixed shaft 8. The stator 3 and rotor 10 are primarily of a separable type, but they do not necessarily have to be separable. The fixed shaft 8 is connected to the stator 3 and does not rotate, nor does it move up or down. The main difference in configuration between Figure 1 and Figure 9 is that the rotating shaft 50 in Figure 9 rotates, while the fixed shaft 8 in Figure 1 does not.

[0018] The rotor 10 holds a plurality of magnets 11 arranged in the circumferential direction. The plurality of magnets 11 are positioned facing the stator 3 and with a gap between them and the stator 3. The first bearing 6 and the second bearing 7 are joined to the fixed shaft 8 with a gap in the direction of the fixed shaft 8. The second bearing 7 is located on the rotor 10 side. Since the distance between the first bearing 6 and the second bearing 7 can be set arbitrarily, increasing the distance between the first bearing 6 and the second bearing 7 makes it possible to reduce vibration of the casing 23. The first bearing 6 and the second bearing 7 are assumed to be of the deep groove type, but this can also be applied to other bearings such as angular contact bearings.

[0019] The impeller base 21 holds the impeller 20 and is conical in shape. The impeller base 21 may also be cylindrical in shape. The impeller base 21 is preferably made of metal. As shown in Figure 1, the impeller base 21 is fixed to a part of the rotor 10 and the outer ring of the first bearing 6. The impeller base 21 and the rotor 10 are fixed together with screws, bolts, adhesive or equivalent, and rotate together as a single unit. The impeller base 21 and the casing 23 may be integrally molded. As the impeller base 21 rotates, the casing 23 rotates in the same manner. The impeller 20 is a blade of a sirocco fan, turbo fan, or axial fan. In particular, a turbo fan blade is preferred for the impeller 20. The impeller 20 is made of resin, but may also be made of metal.

[0020] The casing 23 is hollow inside so that the rotor 10 can be housed within it. The placement of the rotor 10 inside the casing 23 allows for a thinner blower 1. The stator 3 comprises a stator winding 5, a stator core 4, and a motor mounting member 40. The stator core 4 and the magnet 11 face each other with a gap between them. The stator core 4 may be made of powdered iron or an electrical steel sheet. The motor mounting member 40 is attached to the motor installation member 30 (see Figure 7).

[0021] The first fixing member 13 and the second fixing member 14 are connected to the fixed shaft 8. The second fixing member 14 is positioned on the stator 3 side, spaced apart from the first fixing member 13. The second bearing 7 is positioned between the first fixing member 13 and the second fixing member 14. The second fixing member 14 is provided on the fixed shaft 8 at a certain distance from one end of the fixed shaft 8 so that the fixed shaft 8 is securely fixed to the stator 3. The second fixing member 14 is also in contact with the inner ring of the second bearing 7. The second fixing member 14 is in contact with the stator 3, preventing the rotor 10 from coming into contact with the stator 3. The first fixing member 13 and the second fixing member 14 are preferably E-rings. The rotor 10 is joined to the outer ring of the second bearing 7 in its central part and is fixed to the fixed shaft 8 in the direction of the fixed shaft 8.

[0022] The elastic member 15 is positioned between the first fixed member 13 and the first bearing 6, and is designed not to come off the fixed shaft 8. One end of the elastic member 15 is in contact with the first fixed member 13, and the other end of the elastic member 15 is in contact with the inner ring of the first bearing 6. The magnet 11 of the rotor 10 is magnetically attracted to the stator core 4, so the rotor 10 is attracted to the stator 3. Then the second bearing 7 is attracted to the stator 3. This magnetic attraction force can reach, for example, 300N. The elastic member 15 provides a biasing force to the first bearing 6, thereby reducing its magnetic attractive force. The elastic member 15 can be, for example, a spring, a corrugated washer, or rubber. A spring is particularly preferred for the elastic member 15.

[0023] When a voltage is applied to the stator winding 5, a rotating magnetic field is generated from the stator core 4, and this rotating magnetic field causes the rotor 10 to rotate. As the rotor 10 rotates due to the rotational magnetic field force of the stator core 4, the impeller 20 also rotates. Then, the first bearing 6 and the second bearing 7 enable the impeller 20 to perform rotational motion around the fixed shaft 8 of the axial gap motor 2. By using the axial gap motor 2, it becomes possible to make the blower 1 thinner.

[0024] Figure 2 is a schematic diagram illustrating the principle of the blower 1 of Embodiment 1. In the axial gap motor 2, as shown by arrow 1, a magnetic attractive force is generated between the magnet 11 and the stator core 4 in the direction of the fixed shaft 8, causing the rotor 10 to be attracted to the stator 3. If the countermeasures of this disclosure are not taken, the magnitude of the magnetic attractive force will be about 300 N, and the magnetic attractive force will be concentrated at the inner ring of the second bearing 7, which is the area enclosed by the dotted line in Figure 2, that is, the area where it connects to the rotor 10, and at the second stator member 14. Even if a deep groove type bearing is used for the second bearing 7, it is difficult to withstand a force of 300N.

[0025] Therefore, in this disclosure, an elastic member 15 is used to generate a force that pushes back against the inner ring of the first bearing 6, as shown by arrow 2, which is in the opposite direction to the magnetic attraction force (arrow 1). When the inner ring of the first bearing 6 is pushed back by the force indicated by arrow 2, the force indicated by arrow 2 pushes up the outer ring of the first bearing 6 (the area enclosed by the dotted line on the upper surface of the first bearing 6 in Figure 2), and travels along the impeller base 21 to become a force that pushes back the rotor 10, as shown by arrow 3. In other words, the elastic member 15 pushes the rotor 10 back in the opposite direction to arrow 1 with the force of arrow 3.

[0026] The force indicated by arrow 2 can be adjusted by the spring strength of the elastic member 15 and the distance between the first stator member 13 and the inner ring of the first bearing 6. Ideally, the force indicated by arrow 2 should be about half the force indicated by arrow 1. In this disclosure, the force indicated by arrow 2 is adjusted to, for example, about 150 N. The force indicated by arrow 3 is the same as the force indicated by arrow 2. In this disclosure, the load on the inner ring of the second bearing 7 is halved to 150N, which is the value obtained by subtracting the force indicated by arrow 3 (150N) from the force indicated by arrow 1 (300N), thereby reducing the load.

[0027] According to the blower 1 of Embodiment 1, the elastic member 15 applies a force of 150N to the first bearing 6 in a direction away from the second bearing 7, thereby reducing the load due to magnetic attraction. As a result, the concentration of the load due to magnetic attraction at the connection point with the rotor 10 can be reduced.

[0028] Furthermore, the blower 1 of Embodiment 1 can extend its rolling lifespan. The lifespan of a bearing is generally expressed as its basic rated lifespan L. If L is the basic rated life, C is the basic rated load (a value specific to the bearing), and P is the load on the bearing, then the basic rated life L is expressed by the following equation 1. Basic rating life L=(C / P)^3 (Formula 1)

[0029] In Embodiment 1, the load P on the bearing can be halved, so the basic rated life L can be increased by 2^3 = 8 times. For example, in the case of a load of 300N as described in this disclosure, the rolling life of a typical 6201 type bearing used in air conditioning equipment is approximately 50,000 hours. Therefore, by reducing the load by half from 300N to 150N, the rolling life time L can be increased to approximately 400,000 hours, significantly improving the life of the bearing.

[0030] Figure 3 is a schematic exploded view of the blower 1 of Embodiment 1. As shown in Figure 3, the blower 1 can be disassembled into three units: unit 1 (U1), unit 2 (U2), and unit 3 (U3). Unit 1 (U1) is the casing 23. Unit 3 (U3) is the stator 3. Unit 2 (U2) includes the remaining rotor 10, the fixed shaft 8, the first bearing 6, the second bearing 7, the first stator member 13, the second stator member 14, the elastic member 15, and other components around the fixed shaft 8. The blower 1 is assembled using the following two methods. (Method 1) First, the fixed shaft 8 of unit 2 (U2) is inserted into the shaft hole 25 of unit 3 (U3). Next, a part of the rotor 10 of unit 2 (U2) and the outer ring of the first bearing 6 are joined to the inside of the casing 23 of unit 1 (U1). (Method 2) First, a portion of the rotor 10 of unit 2 (U2) and the outer ring of the first bearing 6 are joined to the inside of the casing 23 of unit 1 (U1). Next, insert the fixed shaft 8 of unit 2 (U2) into the shaft hole 25 of unit 3 (U3). According to the above embodiment, by unitizing the blower 1, it is possible to easily assemble the blower 1. (Embodiment 2)

[0031] Figure 4 is a schematic cross-sectional view showing the fan module 35 of Embodiment 2. The fan module 35 is a combination of unit 1 (U1), which is the casing 23 in Figure 3, and unit 2 (U2), which includes the rotor 10. This allows the fan module 35 and unit 3 (U3), which is the stator 3, to be shipped separately, and the fan module 35 and unit 3 (U3) can be assembled at the shipping destination.

[0032] This section explains how to assemble the fan module 35 and unit 3 (U3) when they are shipped separately. Figure 5 is a schematic cross-sectional view showing a blower 1 incorporating the fan module 35 of Embodiment 2. As shown in Figure 5, the fixing shaft 8 of the fan module 35 is inserted into the shaft hole 25 of the stator 3 of unit 3 (U3). A screw 37 is inserted from the side (back) of the stator 3 opposite to the shaft hole 25 to tighten and secure the fixing shaft 8. According to the above embodiment, the fan module 35 and the stator 3 can be easily combined to easily assemble the blower 1. (Embodiment 3)

[0033] As an example of the electrical equipment relating to this disclosure, the configuration of a four-way indoor unit 101 will be described as Embodiment 3. Figure 6 is a schematic representation of electrical equipment, with a four-way indoor unit 101 as an example. Figure 6(a) is a schematic perspective view of the entire four-way indoor unit 101, and Figure 6(b) is an exploded perspective view of the four-way indoor unit 101. As shown in Figure 6(a), the four-way indoor unit 101 comprises a housing 111 and a ventilation cover 115 for intake and exhaust of air. Figure 6(b) is a perspective view showing the housing 111 and the ventilation cover 115 separated. As shown in Figure 6(b), the housing 111 contains an axial gap motor 108 according to Embodiment 1 or Embodiment 2, a casing 112 according to Embodiment 1 or Embodiment 2, a power supply 120, and a heat exchanger (not shown). The casing 112 is equipped with the blades of the turbo fan 1. The axial gap motor 108 and the casing 112 constitute the blower 1 (turbo fan 1).

[0034] As shown in Figure 6(b), the turbofan 1 draws in air through a central opening and discharges it in four directions around it. A heat exchanger (not shown) is positioned around the turbofan 1 and exchanges heat with the air. The heat exchanger converts the indoor air into air for cooling or heating.

[0035] The power supply 120 is located inside the housing 111 and is electrically connected to the axial gap motor 108. Power supply 120 supplies power to the axial gap motor 108, for example, by drawing power from an indoor 100V or 200V AC power supply. Power supply 120 includes an inverter circuit that converts the power from the AC power supply into power such as voltage amplitude, frequency, AC to DC, and pulse width. Note that power supply 120 may also function without performing the above conversion. In that case, power supply 120 functions as an input terminal for the AC power supply. The electrical equipment described herein, by using the blower 1 described above, can reduce the concentration of the load due to magnetic attraction at the connection point with the rotor. Furthermore, the electrical equipment can be made smaller.

[0036] Furthermore, the inventions according to Embodiments 1 to 3 can be substituted or combined, as long as no contradictions arise.

[0037] As described above, this disclosure includes axial gap motors, blowers, electrical equipment equipped with blowers, and fan modules as described in the following items.

[0038] [Item 1] A stator including a stator core around which stator windings are wound, A rotor holding a plurality of magnets arranged circumferentially opposite the stator, A fixed shaft that penetrates the center of the rotor and is fixed to the stator, A first bearing fixed to the aforementioned fixed shaft, The first bearing comprises an elastic member that applies a biasing force to the first bearing, The stator core and the magnet are attracted to each other. The elastic member applies a force in a direction that moves the rotor and the stator apart in an axial gap motor. According to the above embodiment, by using an elastic member in an axial gap motor, it is possible to reduce the concentration of the load due to magnetic attraction force at the joint with the rotor.

[0039] [Item 2] A stator including a stator core around which stator windings are wound, A rotor holding a plurality of magnets arranged circumferentially opposite the stator, A fixed shaft that penetrates the center of the rotor and is fixed to the stator, A first bearing fixed to the aforementioned fixed shaft, A second bearing is positioned on the stator side, spaced apart from the first bearing, and fixed to the fixed shaft. A first fixing member fixed to the aforementioned fixing shaft, The device comprises an elastic member disposed between the first bearing and the first fixing member, The rotor holds the second bearing in its central portion, An axial gap motor wherein one end of the elastic member is in contact with the first fixing member, and the other end of the elastic member is in contact with the first bearing, and the elastic member applies a force in a direction that moves the first bearing away from the second bearing. According to the above embodiment, in an axial gap motor, by using a first bearing, a second bearing positioned spaced apart from the first bearing, and an elastic member, the concentration of the load due to magnetic attraction at the joint with the rotor can be reduced, and the rotor can rotate stably.

[0040] [Item 3] It has a second fixing member that is spaced apart from the first fixing member and positioned on the stator side, and is fixed to the fixing shaft, The axial gap motor according to item 2, wherein the second fixing member holds the rotor on the fixing shaft via the second bearing. According to the above embodiment, contact between the rotor and the stator can be avoided in an axial gap motor by using a first fixing member and a second fixing member.

[0041] [Item 4] The elastic member is a spring, as described in any of items 1 to 3 of the axial gap motor. According to the above embodiment, in an axial gap motor, by using a spring as the elastic member, the elastic member can be easily attached to a fixed shaft in a space-saving manner.

[0042] [Item 5] A blower further comprising a part of the rotor of an axial gap motor described in any of items 1 to 4, and an impeller joined to the outer ring of the first bearing. According to the above embodiment, by joining the impeller to a part of the rotor and the outer ring of the first bearing, the impeller can be integrated with the rotor and rotate stably.

[0043] [Item 6] The impeller is a blower as described in item 5, having the shape of a turbo fan, sirocco fan, or axial fan blade. According to the above embodiment, by using an impeller with the shape of a turbo fan, sirocco fan, or axial fan blade, airflow can be generated efficiently.

[0044] [Item 7] An electrical device equipped with a blower as described in any of items 1 to 6 and a power supply that supplies power to the blower. According to the above embodiment, in an electrical device equipped with the blower, the use of an elastic member can reduce the concentration of the load due to magnetic attraction at the joint with the rotor. Furthermore, the electrical device can be made smaller.

[0045] [Item 8] A rotor holding multiple magnets arranged circumferentially opposite a stator, which includes a stator core around which stator windings are wound, A fixed shaft that penetrates the center of the rotor and connects to the stator, A first bearing joined to the aforementioned fixed shaft, A second bearing is positioned spaced apart from the first bearing and joined to the fixed shaft, A first fixing member joined to a fixed shaft, An elastic member is disposed between the first bearing and the first fixing member and provides a biasing force to the first bearing, The rotor and the impeller connected to the first bearing are provided. The rotor holds the second bearing in its central portion, A fan module in which one end of the elastic member is in contact with the first fixing member, and the other end of the elastic member is in contact with the first bearing, and the elastic member applies a force in a direction that moves the first bearing away from the second bearing. According to the above embodiment, by using an elastic member in the fan module, the concentration of the load due to magnetic attraction at the joint with the rotor can be reduced. Furthermore, the fan module and stator can be shipped separately and easily assembled at the destination.

[0046] [Item 9] It has a second fixing member that is spaced apart from the first fixing member and positioned on the stator side, and is fixed to the fixing shaft, The axial gap motor according to item 8, wherein the second fixing member holds the rotor on the fixed shaft via the second bearing. According to the above embodiment, the rotor and the fixed shaft can be integrated in the fan module by using the first fixing member and the second fixing member.

[0047] [Item 10] The elastic member is a spring, as described in item 8 or 9 of the fan module. According to the above embodiment, by using a spring as the elastic member in the fan module, the elastic member can be easily attached to a fixed shaft in a space-saving manner.

[0048] [Item 11] The impeller is a fan module according to any one of items 8 to 10, which has the shape of a turbine fan, a centrifugal fan, or an axial fan blade. According to the above embodiment, by using an impeller with the shape of a turbo fan, sirocco fan, or axial fan blade, airflow can be generated efficiently. [Explanation of Symbols]

[0049] 1. Blower 2 Axial gap motor 3 stata 4 Stator Core 5 Stator winding 6. First bearing 7. Second bearing 8 Fixed axis 10 rotors 11 Magnets 13 First fixing member 14. Second fixing member 15 Elastic members 20-spindle wheel 21 Impeller Base 23 Casing 25 shaft hole 35 Fan Module 101 Air conditioner outdoor unit 120 Power supply

Claims

1. A stator including a stator core around which stator windings are wound, A rotor holding a plurality of magnets arranged circumferentially opposite the stator, A fixed shaft that penetrates the center of the rotor and is fixed to the stator, A first bearing fixed to the aforementioned fixed shaft, A second bearing is positioned on the stator side, spaced apart from the first bearing, and fixed to the fixed shaft. A first fixing member fixed to the aforementioned fixing shaft and positioned between the first bearing and the second bearing, The device comprises an elastic member disposed between the first bearing and the first fixing member, The rotor holds the second bearing in its central portion, An axial gap motor in which one end of the elastic member is in contact with the first fixing member, and the other end of the elastic member is in contact with the first bearing, and the elastic member applies a force in a direction that moves the first bearing away from the second bearing.

2. It has a second fixing member that is spaced apart from the first fixing member and positioned on the stator side, and is fixed to the fixing shaft, The axial gap motor according to claim 1, wherein the second fixing member holds the rotor on the fixed shaft via the second bearing.

3. The axial gap motor according to claim 1 or 2, wherein the elastic member is a spring.

4. A blower having a part of the rotor of an axial gap motor according to any one of claims 1 to 3 and an impeller joined to the outer ring of the first bearing.

5. The blower according to claim 4, wherein the impeller has the shape of a turbine fan, a centrifugal fan, or an axial fan blade.

6. An electrical device comprising a blower according to any one of claims 1 to 5 and a power supply for supplying power to the blower.

7. A rotor holding multiple magnets arranged circumferentially opposite a stator, which includes a stator core around which stator windings are wound, A fixed shaft that penetrates the center of the rotor and connects to the stator, A first bearing joined to the aforementioned fixed shaft, A second bearing is positioned spaced apart from the first bearing and joined to the fixed shaft, A first fixing member is joined to the fixed shaft and positioned between the first bearing and the second bearing, An elastic member is disposed between the first bearing and the first fixing member and provides a biasing force to the first bearing, The rotor and the impeller joined to the first bearing are provided. The rotor holds the second bearing in its central portion, A fan module in which one end of the elastic member is in contact with the first fixing member, and the other end of the elastic member is in contact with the first bearing, and the elastic member applies a force in a direction that moves the first bearing away from the second bearing.

8. It has a second fixing member that is spaced apart from the first fixing member and positioned on the stator side, and is fixed to the fixing shaft, The fan module according to claim 7, wherein the second fixing member holds the rotor on the fixing shaft via the second bearing.

9. The fan module according to claim 7 or 8, wherein the elastic member is a spring.

10. The fan module according to any one of claims 7 to 9, wherein the impeller has the shape of a turbine fan, a centrifugal fan, or an axial fan blade.

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