JPH04311700A - Motor fan - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower, and particularly to an electric blower used in a vacuum cleaner or the like.

0002

2. Description of the Related Art As a conventional electric blower of this type, there is a technique disclosed in Japanese Patent Application Laid-Open No. 60-242827.

FIG. 6 is a sectional view showing a conventional electric blower.

In the figure, 1 is a permanent magnet, 2 is a rotor incorporating the permanent magnet 1, 3 is an armature winding, 4 is a stator, and 5 is an inner rotor type brushless in which the rotor 2 is located inside the stator 4. It's a motor. 6 is rotor 2
7 is an intake rotor blade driven by the brushless motor 5; 8 is an air flow taken in by the intake rotor blade 7 and is transferred to the brushless motor 5. A guide vane 9 that guides the inside is a fan case that covers the intake rotor vane 7.

The conventional electric blower is constructed as described above, and sucks in dust and the like along with outside air by rotating the intake rotor blade 7. In addition, the inhaled air flow is transferred to the guide vane 8
This flows through the brushless motor 5, cools the brushless motor 5, and prevents the brushless motor 5 from overheating.

[0006]

[Problems to be Solved by the Invention] In the conventional electric blower as described above, the brushless motor 5 is cooled by causing a part of the air flow sucked in by the rotation of the intake rotor 7 to flow through the brushless motor 5. Was.

However, the intake air flow may contain moisture, oil, etc., and when such air flow flows through the brushless motor 5, the inside of the brushless motor 5 gets dirty and the armature winding 3 This is not at all preferable for the brushless motor 5, which is an electrical component, as rust may occur on the rotor 2 and the brushless motor 5, which is an electrical component. Moreover, since the intake air flows through the brushless motor 5, which has a large fluid resistance, the suction performance due to the rotation of the intake rotor 7 is also affected.

[0008] Therefore, the object of the first invention is to provide an electric blower that has high suction performance and does not allow outside air containing moisture and oil to be inhaled together with dust and the like to flow through the electric motor such as the brushless motor 5. That is.

Furthermore, the conventional electric blower cools the brushless motor 5 with a part of the air flow taken in by the rotation of the intake rotor blade 7, and furthermore, this air flow is directed toward the intake rotor blade 7 side. The air was taken in from the intake rotor 7, passed through the stator 4, and flowed in sequence toward the magnetic pole detector 6, which detects the magnetic pole position of the rotor 2. Therefore, heat due to copper loss of the armature winding 3 of the stator 4 and heat due to iron loss of the iron core of the stator 4 flows into the magnetic pole detector 6, and hot air is supplied to the magnetic pole detector 6. 6
This was not desirable from the viewpoint of maintaining quality.

Therefore, the object of the second invention is to provide an electric blower in which cold air is always supplied to the magnetic pole detector 6 and hot air does not flow into the magnetic pole detector 6.

Furthermore, even if a conventional electric blower has a cooling rotor blade, it cannot be rotated at high speed, and a large amount of cooling air cannot be taken into the brushless motor 5. could not. This will be explained using figures. FIG. 7 is a perspective view showing a cooling rotor blade of a conventional electric blower.

In the figure, reference numeral 15 indicates an attachment part to the rotating shaft of the brushless motor 5, reference numeral 16 indicates a propeller fan, and reference numeral 17 indicates a plurality of blades formed by cutting and bending each blade on the outer circumference of the propeller fan 16. .

The cooling rotary blade of this configuration is a propeller fan 16, and when it rotates at high speed, stress concentration occurs at the base of the blade 17, which may cause cracks or the like and breakage. For this reason, when the cooling rotor blade 11 is attached to the rotating shaft of the brushless motor 5, the rotation speed of the brushless motor 5 is restricted, and the rotation of the intake rotor blade 7 is also restricted, leading to a decrease in the performance of the electric blower. Ta.

[0014] Accordingly, it is an object of the third invention to provide an electric blower having cooling rotor blades that can withstand high-speed rotation.

Furthermore, the conventional electric blower cools the brushless motor 5 by causing an air flow to flow inside the brushless motor 5. Therefore, there is a risk that the airflow may contain moisture, and the armature winding 3 and rotor 2
Brushless motor 5 is an electrical component that is prone to rust.
It was difficult to maintain the quality of the products.

[0016] Accordingly, an object of the fourth invention is to provide an electric blower that can cool an electric motor such as the brushless motor 5 without causing an air flow to flow inside the electric motor.

[0017]

[Means for Solving the Problems] In the first invention, there is provided an intake rotor driven by an electric motor such as a brushless motor, and an exhaust gas provided in a fan case that covers the intake rotor to exhaust the intake air flow. The air conditioner includes a window and a guide vane that is located on the outer periphery of the intake rotor and guides the intake air flow from the intake rotor to the exhaust window.

[0018] In the second invention, the cooling rotor blades are driven by an electric motor such as a brushless motor, and the cooling air from the cooling rotor blades passes through the stator portion from the magnetic pole detector that detects the magnetic pole position of the rotor and cools the rotor. The motor is equipped with an electric motor such as a brushless motor that sequentially flows toward the rotor blade.

[0019] In the third aspect of the present invention, a cooling rotary blade having a circular outer circumferential portion and a convex opening on the intake side and driven by an electric motor such as a brushless motor, and a cooling air flow from the cooling rotary blade are provided. The motor is equipped with an electric motor such as a brushless motor that is cooled.

[0020] In the fourth invention, an electric motor such as a brushless motor having a rotor inside the stator, an intake rotary blade driven by the electric motor such as the brushless motor, and an iron core of the stator of the electric motor such as the brushless motor. and a case bracket in which a part of the fan case of the intake rotor is made of a material with good thermal conductivity.

[0021]

[Operation] In the electric blower of the first invention, the intake rotor is driven by an electric motor such as a brushless motor to draw in outside air, and the intake air flow is caused by the guide vanes located on the outer periphery of the intake rotor. Since the air is guided and exhausted through the exhaust window drilled in the fan case, there is a good flow of air from the outside air intake to the exhaust air.Moreover, outside air containing moisture and oil can be removed from the inside of an electric motor such as a brushless motor. It doesn't flow directly.

In the electric blower of the second invention, the cooling rotor blades are driven by an electric motor such as a brushless motor to generate cooling air, and the cooling air is sent from the magnetic pole detector that detects the magnetic pole position of the rotor to the stator. Since the dedicated cooling air flows sequentially toward the cooling rotor blades, electric motors such as brushless motors are cooled by this dedicated cooling air, and hot air does not flow into the magnetic pole detector.

[0023] In the electric blower of the third invention, the cooling rotor blade having a circular outer circumference and a convex opening on the intake side is driven by an electric motor such as a brushless motor to generate cooling air, and the cooling air generates cooling air. Since self-cooling of an electric motor such as a brushless motor is performed, a large amount of cooling air can be stably obtained even when rotating at high speed using a cooling rotary blade that has high strength against centrifugal force.

In the electric blower of the fourth invention, the intake rotor blades are driven by an electric motor such as a brushless motor having a rotor inside the stator, and the support part of the stator core and a part of the fan case of the intake rotor blades are driven by an electric motor such as a brushless motor having a rotor inside the stator. Since the case bracket is made of a material with good thermal conductivity, heat flows from the stator to the case bracket due to heat conduction, and the heat of the electric motor such as the brushless motor 5 is radiated by the intake rotor blades.

[0025]

[Examples] Examples of each invention will be described below.

<First invention> FIG. 1 is a cross-sectional view showing an electric blower which is an embodiment of the first invention, and FIG. 2 is a sectional view showing the intake rotor and guide vanes of the electric blower which is an embodiment of the first invention. FIG. 3 is a perspective view showing a fan case of an electric blower according to an embodiment of the first invention. In the drawings, the same reference numerals and symbols as those in the above conventional example indicate constituent parts that are the same as or correspond to those in the above conventional example.

In the figure, reference numeral 10 denotes an exhaust window formed in the fan case 9, and the intake air flow is exhausted through the exhaust window 10 while being guided by guide vanes 8 located on the outer periphery of the intake rotor 7. Ru. 11 is a cooling rotor blade for cooling the brushless motor 5, and is driven by the brushless motor 5. 12 is a convex opening formed in the cooling rotor blade 11, 20 is a bracket that supports the fan case 9 on the brushless motor 5, and the guide blade 8 that converts dynamic pressure into static pressure is integrated into this bracket 20. It is formed of.

In the electric blower having this configuration, dust and the like are sucked in together with outside air by the rotation of the intake rotor 7, and this sucked air flow is exhausted from the exhaust window 10 of the fan case 9 by the guide blades 8. . Therefore, the airflow taken in by the rotation of the intake rotor 7 does not flow through the brushless motor 5 as in the conventional case, but is smoothly exhausted from the exhaust window 10 of the fan case 9 by the guide vanes 8. Ru. Further, by the rotation of the cooling rotor blade 11, cooling air is taken in from the anti-intake rotor blade 7 side of the brushless motor 5, passes through the inside of the brushless motor 5, cools the brushless motor 5, and is then exhausted to the outside of the brushless motor 5. be done. That is,
In this embodiment, instead of cooling the brushless motor 5 by using the intake air flow from the intake rotor 7, the outside air blow path and the cooling air path are separated, and the dedicated cooling air is provided by the cooling rotor 11. This cools the brushless motor 5.

As described above, the electric blower of this embodiment includes an intake rotor 7 driven by the brushless motor 5, and a fan case 9 that covers the intake rotor 7 and is provided with holes to exhaust the intake air flow. Exhaust window 10 and the intake rotor 7
The guide vane 8 is located on the outer periphery of the intake rotary vane 7 and guides the intake air flow from the intake rotary vane 7 to the exhaust window 10.

The intake rotor 7 is driven by the brushless motor 5 to take in outside air, and the outside airflow is guided by the guide vanes 8 located on the outer periphery of the intake rotor 7. The air is exhausted from an exhaust window 10 formed on the outer periphery of the air.

Therefore, as in the conventional case, the intake rotor 7
The airflow taken in by the rotation of the brushless motor 5
Since the waste is smoothly discharged directly from the exhaust window 10 of the fan case 9 by the guide vanes 8 without flowing inside, the air flows well from outside air intake to exhaust, resulting in a high-performance electric blower. In addition, since the outside air containing moisture and oil does not flow directly inside the brushless motor 5, the inside of the brushless motor 5 is not contaminated, and the armature winding 3 and rotor 2 are not rusted. can prevent quality deterioration. Furthermore, the brushless motor 5 is cooled by the dedicated cooling air provided by the cooling rotor 11, and overheating of the brushless motor 5 is prevented, thereby improving the safety of the electric blower and promoting a longer life.

<Second invention> FIG. 1 is a sectional view showing an electric blower which is an embodiment of the second invention, and this view is common to the first invention. Therefore, description of each component in the figure will be omitted, and characteristic parts will be described here.

[0033] Also in the electric blower having this configuration, the rotation of the intake rotor 7 sucks in dust and the like together with the outside air.
This intake airflow is exhausted by the guide vanes 8 through the exhaust window 10 of the fan case 9. In addition, the cooling rotor 1
1, cooling air is taken in from the anti-intake rotor blade 7 side of the brushless motor 5, and this cooling air passes from the magnetic pole detector 6 that detects the magnetic pole position of the rotor 2, passes through the stator 4 section, and is rotated for cooling. It sequentially flows in the direction of the blade 11. The brushless motor 5 is cooled by the cooling air flowing in this manner. Therefore, cold air is always supplied to the magnetic pole detector 6, and heat due to copper loss in the armature winding 3 of the stator 4,
Heat due to core loss of the stator 4 does not flow into it.

As described above, the electric blower of this embodiment has the cooling rotary blades 11 driven by the brushless motor 5.
and a brushless motor 5 in which the cooling air generated by the cooling rotor blades 11 sequentially flows from a magnetic pole detector 6 for detecting the magnetic pole position of the rotor 2 through the stator 4 toward the cooling rotor blades 11.

Cooling air is generated by driving the cooling rotary blade 11 with the brushless motor 5, and the cooling air passes from the magnetic pole detector 6 for detecting the magnetic pole position of the rotor 2, through the stator 4, and is cooled. The cooling air sequentially flows toward the rotary blade 11, and the brushless motor 5 is cooled by this cooling air.

Therefore, in this embodiment as well, as in the above embodiment, the outside air containing moisture, oil, etc. taken in by the rotation of the intake rotor 7 does not directly flow inside the brushless motor 5. The inside of the brushless motor 5 is not dirty, the armature winding 3 and the rotor 2 are not rusted, and the quality of the electric blower can be prevented from deteriorating. Moreover, the brushless motor 5 can be cooled by the dedicated cooling air provided by the cooling rotary blade 11, and overheating of the brushless motor 5 can be prevented, so that the safety of the brushless motor 5 can be improved and its lifespan can be extended. In addition, the cooling air flows sequentially from the magnetic pole detector 6 through the stator 4 toward the cooling rotor 11, and the magnetic pole detector 6 is always supplied with cold air. Since hot air due to iron loss or iron loss in the iron core of the stator 4 does not flow into the magnetic pole detector 6, a high-quality electric blower can be obtained. Furthermore, by adopting a cooling mechanism with such a configuration, there is no need for a dedicated safety cover to protect the cooling rotor 11, and the rotor assembly can be installed with the cooling rotor 11 attached to the rotating shaft of the brushless motor 5. can be inserted into the stator assembly, making assembly and disassembly work easier.

<Third Invention> FIG. 4 is a perspective view showing a cooling rotor blade of an electric blower which is an embodiment of the third invention. In the drawings, the same reference numerals and symbols as those in the above-mentioned conventional example and each embodiment indicate constituent parts that are the same as or correspond to those in the above-mentioned conventional example and each embodiment.

In the figure, 12 is a convex opening formed on the intake side of the cooling rotor 11, 13 is a bag-shaped convex portion forming the convex opening 12, and 14 is a circular shape of the cooling rotor 11. This is the outer periphery of The cooling rotor 11 is driven by the brushless motor 5, and the brushless motor 5 is self-cooled by the cooling air generated by the cooling rotor 11.

[0039] Also in the electric blower having this configuration, the rotation of the intake rotor blade 7 sucks in dust and the like together with outside air.
This intake airflow is exhausted by the guide vanes 8 through the exhaust window 10 of the fan case 9. In addition, the cooling rotor 1
1 rotation, cooling air is taken in from the anti-intake rotor blade 7 side of the brushless motor 5. Moreover, since the outer periphery of the cooling rotor blades 11 is on the same plane and connected in a circular shape, it is strong against centrifugal force and can stably supply cooling air into the brushless motor 5 even during high-speed rotation.

As described above, the electric blower of this embodiment has a circular outer peripheral portion 14 and a convex opening 12 on the intake side, and includes a cooling rotary blade 11 driven by the brushless motor 5, and a cooling rotary blade 11 driven by the brushless motor 5. The brushless motor 5 is self-cooled by the cooling air generated by the rotary blades 11.

The cooling rotor 11 having a circular outer peripheral portion 14 and a convex opening 12 on the intake side is driven by the brushless motor 5 to generate cooling air, and the cooling air cools the brushless motor 5 by itself. will be carried out.

Therefore, in this embodiment, as in the above-mentioned embodiments, the outside air containing moisture, oil, etc. taken in by the rotation of the intake rotor 7 does not directly flow inside the brushless motor 5. The inside of the brushless motor 5 is not dirty, the armature winding 3 and the rotor 2 are not rusted, and the quality of the electric blower can be prevented from deteriorating. In addition, the brushless motor 5 can be cooled by the dedicated cooling air generated by the cooling rotor 11, and overheating of the brushless motor 5 can be prevented, so the safety of the brushless motor 5 is improved.
It can promote long life and become a high quality electric blower. Furthermore, by adopting the cooling rotor blade 11 as shown in FIG. 4, which has high strength against the centrifugal force generated by rotation,
Since a stable cooling air can be obtained even during high-speed rotation and a large amount of cooling air can be taken into the brushless motor 5, the cooling rotor 11 can be directly attached to the rotating shaft of the brushless motor 5. The rotation speed of the brushless motor 5 is not limited, and the rotation of the intake rotor 7 is also not limited. As a result, the performance of the electric blower does not deteriorate and high performance can be maintained. Moreover, the wall thickness of the cooling rotor blade 11 can be made thinner,
Since the weight can be reduced, the fluid resistance of the convex opening 12 serving as the intake opening can be reduced, and an efficient cooling rotor blade 11 can be provided at a low cost.

<Fourth Invention> FIG. 5 is a sectional view showing an electric blower which is an embodiment of the fourth invention. In the drawings, the same reference numerals and symbols as those in the above-mentioned conventional example and each embodiment indicate constituent parts that are the same as or correspond to those in the above-mentioned conventional example and each embodiment.

In the figure, 18 is a case bracket made of aluminum material with high thermal conductivity, 19 is a heat flow flowing through the case bracket 18, and 21 is an iron core of the stator 4. In this embodiment, the case bracket 18 constitutes a support portion of the iron core 21 of the stator 4 of the brushless motor 5 and a part of the fan case 9 of the intake rotor 7 .

[0045] Also in the electric blower having this configuration, the rotation of the intake rotor 7 sucks in dust and the like together with the outside air.
This intake airflow is exhausted by the guide vanes 8 through the exhaust window 10 of the fan case 9. Further, the heat generated by the brushless motor 5 becomes a heat flow 19 due to thermal conduction, flows from the stator 4 to the case bracket 18, is exposed to the air passage, and is forcibly radiated by the intake rotor 7. In particular, when the brushless motor 5 is rotated at high speed, the drive frequency becomes high, so the iron loss of the iron core 21 accounts for a larger weight than the copper loss of the armature winding 3 of the stator 4 in terms of heat generation. Therefore, by forming the support portion of the iron core 21 from an aluminum material having good thermal conductivity, heat dissipation due to heat conduction is good, which is preferable for cooling the brushless motor 5.

As described above, the electric blower of this embodiment includes the brushless motor 5 having the rotor 2 inside the stator 4.
The intake rotor 7 driven by the brushless motor 5, the support portion of the iron core 21 of the stator 4 of the brushless motor 5, and a part of the fan case 9 of the intake rotor 7 are made of a material with good thermal conductivity. The case bracket 18 is formed of.

That is, the intake rotor 7 is driven by the brushless motor 5 having the rotor 2 inside the stator 4, and the supporting part of the iron core 21 of the stator 4 and a part of the fan case 9 of the intake rotor 7 are heated. The case bracket 18 is made of a material with good conductivity.

Therefore, in this embodiment, as in the above-mentioned embodiments, the outside air containing moisture, oil, etc. taken in by the rotation of the intake rotor 7 does not directly flow inside the brushless motor 5. The inside of the brushless motor 5 is not dirty, the armature winding 3 and the rotor 2 are not rusted, and the quality of the electric blower can be prevented from deteriorating. In addition, in this electric blower, the heat flow 19 due to thermal conduction is transferred to the stator 4.
The air flows from the air to the case bracket 18, and the intake rotor 7 promotes heat dissipation by the heat flow 19. Therefore, the brushless motor 5 can be cooled without flowing the air flow inside the brushless motor 5. There is no rust on the armature winding 3 or rotor 2 due to moisture.
It can promote the longevity of electric blowers and improve quality. In particular, if the case bracket 18 is made of aluminum as in this embodiment, it is possible to promote weight reduction of the entire electric blower.

[0049]

[Effects of the Invention] As explained above, the electric blower of the first invention includes an intake rotor, a guide vane located on the outer periphery of the intake rotor, and a guide vane provided on the outer periphery of the guide vane. The outside air that is taken in when the intake rotary vane is driven by an electric motor such as a brushless motor is guided to the exhaust window by the guide vanes, and is exhausted from the exhaust window. The airflow to the exhaust is good, making it a high-performance electric blower, and since the outside air, which contains moisture and oil, does not flow directly through the motor such as a brushless motor, the inside of the motor such as a brushless motor is not contaminated. , rust does not occur on the armature winding or rotor, and deterioration in the quality of the electric blower can be prevented.

The electric blower of the second invention includes a cooling rotary blade and an electric motor such as a brushless motor through which cooling air flows, and the cooling air generated when the cooling rotor blade is driven by the electric motor such as a brushless motor. The air flows sequentially from the magnetic pole detector that detects the magnetic pole position of the rotor, passes through the stator section, and toward the cooling rotor blade, and the electric motor such as the brushless motor is cooled by this dedicated cooling air. Similarly, since the outside air containing moisture and oil does not flow directly inside the brushless motor, the inside of the motor such as the brushless motor does not become dirty, and the armature windings and rotor do not rust. In addition to preventing deterioration in the quality of the blower, the dedicated cooling air provided by the cooling rotor prevents electric motors such as brushless motors from overheating, improving the safety of electric motors such as brushless motors and extending their service life. At the same time, the quality of the electric blower is improved because the magnetic pole detector is always supplied with cold air and hot air does not flow into the magnetic pole detector.

The electric blower of the third invention includes a cooling rotary blade and an electric motor such as a brushless motor that self-cools with cooling air, and has a circular outer circumference and a convex opening on the intake side. By self-cooling the electric motor such as the brushless motor with the cooling air generated when the rotary blade is driven by the electric motor such as the brushless motor, moisture, oil, etc. are not contained, as in the first and second inventions above. Since the outside air does not flow directly through the brushless motor, the inside of the motor such as the brushless motor does not get dirty, and the armature windings and rotor do not get rusted, which not only prevents the quality of the electric blower from deteriorating. The dedicated cooling air from the cooling rotor can cool electric motors such as brushless motors and prevent them from overheating, improving the safety of electric motors such as brushless motors and promoting their longevity. This is a high-quality electric blower, and by using cooling rotor blades that are strong against centrifugal force, stable cooling air can be obtained even during high-speed rotation, and a large amount of cooling air can be produced without brushing. Since it can be incorporated into an electric motor such as a motor, the performance of the electric blower will not deteriorate.
Can maintain high performance.

[0052] The electric blower of the fourth invention includes an electric motor such as a brushless motor having a rotor inside a stator, an intake rotor, and a case bracket made of a material with good thermal conductivity. is driven by an electric motor such as a brushless motor, and the support part of the core of the stator 4 and a part of the fan case of the intake rotor blade are formed with a case bracket, so that moisture and Since the outside air containing oil does not directly flow through the motor such as a brushless motor, the inside of the motor such as a brushless motor does not get dirty and rust does not occur on the armature winding or rotor, improving the quality of the electric blower. In addition to preventing deterioration of the motor, the heat flow flows from the stator to the case bracket due to thermal conduction, and the intake rotor promotes heat dissipation due to the heat flow, so there is no air flow inside the electric motor such as a brushless motor. It can cool motors such as brushless motors, prevent rust from forming on the armature windings and rotor due to the moisture contained in the airflow, and help extend the life of electric blowers.
Quality improves.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an electric blower which is an embodiment of the first and second inventions.

FIG. 2 is a perspective view showing an assembled state of an intake rotor blade and a guide blade of an electric blower according to an embodiment of the first invention.

FIG. 3 is a perspective view showing a fan case of an electric blower according to an embodiment of the first invention.

FIG. 4 is a perspective view showing a cooling rotor blade of an electric blower according to an embodiment of the third invention.

FIG. 5 is a sectional view showing an electric blower according to an embodiment of the fourth invention.

FIG. 6 is a sectional view showing a conventional electric blower.

FIG. 7 is a perspective view showing a cooling rotor blade of a conventional electric blower.

[Explanation of symbols]

1 Permanent magnet 2 Rotor 3 Armature winding 4 Stator 5 Brushless motor 6 Magnetic pole detector 7 Intake rotor blade 8 Guide wing 9 Fan case 10 Exhaust window 11 Cooling rotor blade 12 Convex opening 18 Case bracket

Claims (4)

[Claims] 1. An intake rotor driven by an electric motor, an exhaust window provided in a fan case covering the intake rotor to exhaust the intake air flow, and an exhaust window located on the outer periphery of the intake rotor. An electric blower comprising: a guide vane that guides the intake air flow from the intake rotary vane to an exhaust window. 2. Cooling rotor blades driven by an electric motor, and cooling air from the cooling rotor blades sequentially flowing from a magnetic pole detector for detecting a magnetic pole position of the rotor, through a stator portion, toward the cooling rotor blades. An electric blower characterized by comprising an electric motor. 3. A cooling rotary blade having a circular outer periphery and a convex opening on the intake side and driven by an electric motor, and an electric motor that is self-cooled by cooling air from the cooling rotor blade. An electric blower characterized by: 4. An electric motor having a rotor inside a stator, and an intake rotor driven by the electric motor,
An electric blower comprising: a support part for a stator core of the electric motor; and a case bracket in which a part of a fan case of an intake rotor blade is made of a material with good thermal conductivity.