JP2000324757A - Outer rotor type of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily cool a stator. SOLUTION: A stator 22 is constituted by attaching a stator iron core 24 to the peripheral face of a fixing shaft 23, and also to a mounting stator wiring 25. A pair of ventilatable bearing brackets 28 and 29 are provided rotatably via bearings 26 and 27, which are positioned on both sides of the stator 22 on the rotary shaft 23, and a rotor 30 is attached to these bearing brackets 28 and 29. A guide member 33 is cylindrical as a whole, and its one end is attached concentrically to the inner face of an inner annular rib 28b of the bearing bracket 28, and an opening 33b at the other end surrounds the periphery of one end of the stator winding 25. The guide member 34 is similarly attached to the bearing bracket 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an outer rotor type motor provided with a cooling function.

[0002]

24 and 25 show a conventionally known outer rotor type motor 1. FIG. The stator 2 of the motor 1 has a stator core 4 attached to an outer peripheral surface of a fixed shaft 3 and a stator winding 5 attached thereto. The rotor 6 is rotatably provided via bearings 7, 7 and bearing brackets 8, 8 so as to be located outside the stator 2.

The rotor 6 has a rotor core 10 mounted on the inner surface of a casing 9 and a rotor conductor 11 mounted on the rotor core 10, and each end of the rotor conductor 11 is an end ring. The connection is conducted by 11a. Although not shown, a load is attached to the outside of the casing 9. Further, as shown in FIG. 25, the bearing brackets 8 have a configuration having annular rib portions 8a and 8b and a plurality of linear rib portions 8c and 8d. An opening 8e for ventilation is formed between 8c and 8d.

In the above configuration, when the rotor 6 is rotated, iron loss occurs in the rotor core 10 and the stator core 4, copper loss occurs in the rotor conductor 11 and the stator winding 5, and bearing loss occurs. Friction loss occurs at 7, 7 and wind loss occurs on the surface of the rotor 6, and as a result, the temperature rises in each part.

On the other hand, when the flow of air is observed, the rotation of the rotor 6 causes air to flow through the motor 1 in the motor 1 as shown by the arrows in the bearing bracket 8, the rotor core 4, and the end ring 1.
1a and a space surrounded by the stator winding 5 of the stator 2 and the like. In the ventilation openings 8 e in the bearing brackets 8, 8, there is little air flow between the inside and outside of the motor 1, though a slight air flow is observed.

Thus, the heat generated in the stator 2 is transmitted to the rotor 6 through an air gap G with the rotor 6, and
Although heat is often radiated from the casing 9, the heat is also transmitted from the fixed shaft 3 to the bearings 7. The heat generated by the rotor 6 is often radiated from the casing 9.

In the above-described apparatus, since the air cooling effect is low, the heat generated in the stator 2 is transferred to the rotor 6 through the air gap G.
Although the heat is radiated to the side, the heat radiating property is poor, and the temperature of the stator 2, especially the stator winding 5, becomes high. In order to prevent the temperature of the stator winding 5 from exceeding the insulation allowable temperature, it is necessary to increase the volume of the stator core 10 and the volume of the stator conductor 11 to lower the heat generation density and increase the heat radiation area. However, there are problems such as an increase in weight and an increase in size.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an outer rotor type motor capable of properly cooling a stator.

[0009]

According to a first aspect of the present invention, there is provided a stator which is attached to a fixed shaft and has a stator core and a stator winding; And a pair of air-permeable bearing brackets rotatably provided via bearings, and both end portions are attached to outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator. A rotor and a guide member which has a cylindrical shape as a whole and has one end attached to the inner surface of the bearing bracket and the other end side surrounding the outer periphery of the stator winding. Has features.

In this configuration, when the rotor rotates,
Although a circulating air flow tends to be generated near the end ring of the rotor and the wall surface of the casing, in the above-described configuration, one end of a cylindrical guide member is attached to the inner surface of the bearing bracket so as to communicate with the outside. In addition, since the other end of the guide member surrounds the outer periphery of the stator winding, circulating air flow is not generated, and the outer periphery of the guide member is pressurized, and the outer periphery of the guide member is Air flows in the centrifugal direction and the outward direction and flows out.
As a result, negative pressure is applied to the inner peripheral surface side of the guide member, and external air flows into the guide member. The external air flows around the stator winding to the outer peripheral side of the guide member (rotor side), and exits through the outer peripheral side of the guide member.

By providing the guide member in this manner, an air flow passage which flows through the inside and outside of the motor while reliably passing around the stator winding is formed, thereby concentrating cooling on the stator winding. As a result, the cooling effect is remarkably improved, and the volume of the stator can be reduced, and the motor can be downsized.

[0012] The invention according to claim 2 is mounted on a fixed shaft,
A stator having a stator iron core and a stator winding; a pair of air-permeable bearing brackets rotatably provided via bearings located on both sides of the stator on the fixed shaft; A part is attached to the outer edge of the pair of bearing brackets, and the rotor is rotatably provided around the outer periphery of the stator, and has a cylindrical shape as a whole, and one end is attached to the inner surface of the bearing bracket. The other end is characterized by including a guide member having a form surrounding the outer periphery of the stator winding and an axial fan blade provided inside the guide member.

In this configuration, when the rotor is rotated, the guide member integrated with the bearing bracket and the axial fan blade rotate. In this case, the blowing action by the axial fan blade is stronger than the airflow forming action by the guide member. As a result, when the rotor is rotated, the axial flow fan blades forcibly generate an airflow in which air flows from the one end toward the other end of the guide member. The air flows into the guide member, flows toward the stator winding, exits the other end of the guide member, and flows out of the motor through the outer periphery thereof. Also, when the rotor is rotated in the reverse direction, a reverse airflow is forcibly generated inside the guide member, and as a result, air outside the motor flows into the outer periphery of the guide member, and It flows into the guide member from the end, passes through the periphery of the stator winding, and flows out of the motor from one end inside the guide.

As described above, the guide member forms an air flow passage which passes intensively around the stator winding, and the axial flow fan blade increases the air flow of the air flow.
As a whole, the cooling effect on the stator is further improved, and it is possible to further contribute to the reduction of the stator volume and the miniaturization of the motor.

A third aspect of the present invention differs from the second aspect in that an axial fan blade is provided outside the guide member. In this configuration, when the rotor is rotated, the guide member integrated with the bearing bracket and the axial fan blade rotate. In this case, the blowing action by the axial fan blade is stronger than the airflow forming action by the guide member. As a result, when the rotor is rotated, the axial flow fan blades forcibly generate an airflow in which air flows from the one end to the other end of the outer periphery of the guide member. External air flows into the outer periphery of the guide member, flows into the guide member from the other end side, passes around the stator winding, and flows out of the motor from the one end side inside the guide member. become.

Further, when the rotor is rotated in the reverse direction, an airflow is forcibly generated from the other end to the one end on the outer periphery of the guide member. As a result, air outside the motor is guided by the guide member. It flows into the inside and flows to the stator winding side, and then exits the other end side of the guide member and flows out of the motor through the outer periphery thereof. In this way, the guide member forms an air flow passage that passes intensively around the stator winding, and the axial fan blades increase the airflow of the air flow, further improving the cooling effect on the stator as a whole. However, it is possible to further contribute to a reduction in the volume of the stator and a reduction in the size of the motor. Further, by providing the axial fan blade outside the guide member, the diameter can be increased, the air volume can be further increased, and the cooling effect is further improved.

The invention according to claim 4 is characterized in that the sectional shape of the axial fan blade is symmetrical. In this configuration, the axial fan blade has a good shape in either the forward direction or the reverse direction. The cooling air flow can be formed, and the cooling effect can be improved regardless of the rotation direction of the motor.

The invention according to claim 5 is mounted on a fixed shaft,
A stator having a stator core and a stator winding, and provided on both sides of the stator on the fixed shaft so as to be rotatable via a bearing, a bearing housing portion, An inner annular rib portion, an outer annular rib portion having a diameter larger than the inner annular rib portion, an inner radial rib portion connecting the bearing housing portion and the inner annular rib portion, an inner annular rib portion, and an outer portion. A pair of bearing brackets each having an outer radial rib portion connected to the annular rib portion, and both end portions attached to the outer annular rib portions of the pair of bearing brackets so as to be outside the stator. A rotor that is rotatably provided therearound, and has a cylindrical shape as a whole, one end of which is attached to the inner surface of the inner annular rib portion of the bearing bracket, and the other end of which surrounds the outer periphery of the stator winding. And a guide member that becomes Characterized in place by forming a side radial ribs in the axial flow fan blade shape.

In the above construction, an opening (hereinafter referred to as an inner opening) is formed between the bearing housing portion and the inner annular rib portion, and the opening between the inner annular rib portion and the outer annular rib portion is formed. An opening (hereinafter referred to as an outer opening) is formed therebetween. That is, the inner opening and the outer opening are defined by the inner annular rib portion. Further, since one end of the guide member is attached to the inner surface of the inner annular rib portion, the inside of the guide member can communicate with the inner opening, and the outside of the guide member can communicate with the outer opening. become.

Since the inner radial rib portion is formed in the shape of an axial fan blade, when the rotor is rotated, a blowing action such that external air is forced to flow into the guide member occurs. As a result, air outside the motor flows into the guide member and flows toward the stator winding, and then exits the other end of the guide member and flows out of the motor through the outer periphery thereof. Further, when the rotor is rotated in the reverse direction, an air blowing action occurs in which the air inside the guide member is forced to flow out of the motor, and as a result, air outside the motor flows into the outer periphery of the guide member. Then, it flows into the inside of the guide member from the other end side, passes around the stator winding, and flows out of the motor from one end side inside the guide member.

As a result, concentrated cooling of the stator windings can be achieved, and the air flow of the inner radial ribs in the shape of the axial fan blade increases the airflow of the air flow, further improving the cooling effect on the stator. Thus, it is possible to further contribute to a reduction in the volume of the stator and a reduction in the size of the motor. Furthermore, since air is blown using the bearing bracket, the configuration can be simplified as compared with a case where an axial fan blade is separately provided.

The sixth aspect of the present invention differs from the fifth aspect of the present invention in that the outer radial rib portion is formed in the shape of an axial fan blade. In this configuration, when the rotor is rotated, the radial rib portion forcibly generates an airflow from one end to the other end around the outer periphery of the guide member. Air flows into the outer periphery of the guide member, flows into the guide member from the other end side, passes around the stator winding, and flows out from the one end side inside the guide member to the outside of the motor. Become. Further, when the rotor is rotated in the reverse direction, an airflow is forcibly generated from the other end to the one end on the outer periphery of the guide member. As a result, air outside the motor flows into the guide member. Then, it flows to the stator winding side, and then exits the other end side of the guide member and flows out of the motor through the outer periphery thereof. As a result, the same effect as that of the fifth aspect of the invention can be obtained. In particular, since the diameter of the outer radial rib portion can be increased, the air volume can be further increased, and the cooling effect is further improved.

A seventh aspect of the present invention is characterized in that the radial rib portion having the shape of an axial fan blade has a symmetrical sectional shape. In this configuration, a good cooling air flow can be formed in either the forward or reverse rotation direction, and the cooling effect can be improved regardless of the rotation direction of the motor.

The invention according to claim 8 is mounted on a fixed shaft,
A stator having a stator core and a stator winding, a pair of bearing brackets located on both sides of the stator on the fixed shaft and rotatably provided via bearings, and both end portions; A rotor attached to the outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator, and a rotor formed to communicate the inside and outside of one of the pair of bearing brackets. A first air circulation portion having a first hole and having a first hood provided in a form surrounding the first hole and having a rotation direction side opened;
It has a second hole formed so as to communicate the inside and the outside with the other of the pair of bearing brackets, and is provided in a form surrounding the second hole, in a direction opposite to the first hood. And a second air circulating portion having a second hood opened to the outside.

In this configuration, when the rotor is rotated, the outside air is taken into the first hole by the first hood in the first air circulation section, passes through the inside of the motor, and then enters the second hole. The motor comes out of the motor through the second hole of the air circulation part and the opening of the second hood. Such air circulation allows the inside of the motor to be air-cooled. As a result, the stator windings are also cooled, which contributes to a reduction in the volume of the stator and a reduction in the size of the motor. Also, when the rotor is rotated in the opposite direction, the outside air is taken into the second hole by the second hood in the second air circulation unit, and conversely, The first hole and the opening of the first hood of the first air circulating portion come out of the motor. Therefore, it is possible to contribute to the improvement of the cooling effect regardless of the rotation direction of the motor.

[0026] According to a ninth aspect of the present invention, the fixing device is mounted on a fixed shaft,
A stator having a stator core and a stator winding, a pair of bearing brackets located on both sides of the stator on the fixed shaft and rotatably provided via bearings, and both end portions; A rotor attached to the outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator, and connecting the bearing bracket to a bearing housing, an annular rib, and the like. Having a radial rib portion,
The present invention is characterized in that the radial rib portion has an axial fan blade shape.

In this configuration, when the rotor is rotated, the bearing bracket also rotates. In this case, the radial rib portion has the shape of an axial fan blade, so that a blowing action occurs, External air flows into the motor. As a result, the stator windings are also cooled, which contributes to a reduction in the volume of the stator and a reduction in the size of the motor.

The tenth aspect of the present invention is characterized in that the cross-sectional shape of the radial rib portion is symmetrical, whereby good cooling air can be obtained in either the forward or reverse rotation direction. A flow can be formed, which can contribute to the improvement of the cooling effect regardless of the rotation direction of the motor.

An eleventh aspect of the present invention provides a stator mounted on a fixed shaft and having a stator core and a stator winding.
Bearing brackets rotatably provided via bearings located on both sides of the stator on the fixed shaft, and both end portions are attached to outer edges of the pair of bearing brackets and rotate around the outer periphery of the stator; A rotor provided so as to be capable of being provided, a vent portion penetrating in the axial direction is formed in the stator core, and a substantially hollow first hollow portion extending to an intermediate portion in the axial direction is formed at one end of the fixed shaft. A second hollow portion that is substantially hollow and extends to the middle in the axial direction is formed at the other end of the fixed shaft, and a second hollow portion that communicates with a space on one end side of the stator at a peripheral wall of the first hollow portion. A first communication hole is formed, and a second wall communicating with a space on one end side of the stator is formed on a peripheral wall of the second cavity.
The communication hole is formed, and a fan is provided in at least one of the first cavity and the second cavity.

In the above configuration, when the fan is rotated, the air blows from the first cavity to flow into the space on one end side of the stator through the first communication hole, thereby causing the stator core to rotate. The air enters the second cavity through the second communication hole through the ventilation part, and exits through the second cavity. Note that when the fan is rotated in the opposite direction, the airflow is reversed. Such an airflow ensures that the stator can be cooled.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the outer rotor type motor 21 in cross section. The stator 22 of the motor 21 is configured such that a stator core 24 is mounted on an outer peripheral surface of a fixed shaft 23 and a stator winding 25 is mounted. A pair of air-permeable bearing brackets 28 and 29 are rotatably provided on both sides of the stator 22 on the fixed shaft 23 via bearings 26 and 27, and are rotatably provided on outer peripheral portions of the bearing brackets 28 and 29. Child 3
0 is attached, so that the rotor 30 is
2, the bearing brackets 28 and 29 and the bearing 2
It is rotatably provided via 6, 27.

The rotor 30 has a rotor core 31 mounted on the inner surface of a casing 30a, and a rotor conductor 32 mounted on the rotor core 31. Each end of the rotor conductor 32 is an end ring. It is connected and conductive by 32a. In addition, a load is attached to the outside of the casing 30a.

Since the bearing brackets 28 and 29 have the same structure, only one of the bearing brackets 28 will be described. As shown in FIG.
Are a bearing housing portion 28a, an inner annular rib portion 28b larger in diameter than this, an outer annular rib portion 28c larger in diameter than this inner annular rib portion 28b, and a bearing housing portion 2
The inner radial rib portion 28d connects the inner annular rib portion 8b to the inner annular rib portion 28b, and the outer radial rib portion 28e connects the inner annular rib portion 28b and the outer annular rib portion 28c. As a result, an inner opening 28f is formed on the inner side of the inner annular rib 28b, and an outer opening 28g is formed on the outer side, so that the bearing bracket 28 is permeable.

In the other bearing bracket 29, a portion corresponding to the bearing housing portion 28a is denoted by reference numeral 2.
9a, a portion corresponding to the inner annular rib portion 28b is denoted by reference numeral 29b, a portion corresponding to the outer annular rib portion 28c is denoted by reference numeral 29c, and the inner radial rib portion 28d is provided.
The portion corresponding to the reference numeral 29d is assigned, the portion corresponding to the outer radial rib portion 28e is assigned the reference numeral 29e, the portion corresponding to the inner opening portion 28f is assigned the reference numeral 29f, and the outer opening portion 28g is assigned. Corresponding parts are denoted by the reference numeral 29g.

Since the guide members 33 and 34 have the same configuration (symmetrical shape), one of the guide members 33 will be described as a representative. The guide member 33 has a cylindrical shape as a whole,
The inner diameter of the opening 33a at one end is set to be substantially the same as the inner diameter of the inner annular rib 28b of the bearing bracket 28, and the inner diameter of the opening 33b at the other end is the same as that of the stator 22. Is set to an intermediate dimension between the outer dimensions of the stator winding 25 and the inner diameter of the end ring 32a of the rotor 30. An intermediate portion of the guide member 33 is a tapered portion 32c.

Thus, one end of such a guide member 33 is concentrically attached to the inner surface of the inner annular rib portion 28b of the bearing bracket 28. In this case, the opening 33b at the other end is connected to the stator winding. The outer periphery of one end of the wire 25 is surrounded, and the outer surface of the tapered portion 33c is substantially opposed to one end ring 32a of the rotor conductor 32. Further, the inside of the guide member 33 communicates with the inside opening 28f of the bearing bracket 28, and the outside is the outside opening 2f.
8g.

The guide member 34 also has openings 34a and 34b having the same diameter as the guide member 33 and a tapered portion 34c having the same shape. The guide member 34 has an opening 34a at one end. Are mounted concentrically on the inner surface of the inner annular rib portion 29b of the bearing bracket 29. In this case, the opening 34b at the other end surrounds the outer periphery of the other end of the stator winding 25, and
The outer surface of the tapered portion 34c substantially faces the other end ring 32a of the rotor conductor 32. Further, the inside of the guide member 34 communicates with the inside opening 29f of the bearing bracket 29, and the outside communicates with the outside opening 29g. It will be in the form of communication.

In the above-described embodiment, when the rotor 30 rotates, an air flow is generated in the guide members 33 and 34. Since both are the same, the guide member 33 will be described. That is, the rotation of the rotor 30 causes the end ring 3 on one (left side in the figure) of the rotor 30 to rotate.
A circulating air flow tends to be generated near the wall surface of the casing 2a or the casing 30a. However, according to the present embodiment, one end of the cylindrical guide member 33 is attached to the inner surface of the bearing bracket 28, and the other end of the guide member 33 surrounds the outer periphery of the stator winding 25. Since the circulating air flow is not generated, the outer peripheral side of the guide member 33 is pressurized, and air flows in the centrifugal direction and the external direction on the outer peripheral surface side of the guide member 33 and flows out. As a result, the inner peripheral surface side of the guide member 33 becomes a negative pressure, and external air flows into the guide member 33 through the inner opening 28f as shown by the arrow. The external air passes around the stator winding 25, further passes through a straight portion 25 a protruding from the stator core 24 in the winding 25, and flows toward the outer peripheral side of the guide member 33 (the rotor 22 side). It passes through the outer peripheral side of the member 33 and exits through the outer opening 28g. The same effect can be obtained in the guide member 34. The flow of air at this time is indicated by arrows.

By providing the guide members 33 (34) in this manner, the motor 2
1, an air flow passage which flows inside and outside is reliably formed, and concentrated cooling of the stator windings 25 can be achieved, the cooling effect is remarkably improved, and the volume reduction of the stator 22 and the motor 21 It can contribute to downsizing.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, the radial size of the stator 22 is different from that of the first embodiment.
Accordingly, the shape of the guide member 41 is slightly different. That is, the stator core 24 of the stator 22 is formed to have a large diameter, and the stator winding 25 is mounted on a portion closer to the outside of the core 24. In the guide member 41, an opening 41b on the other end is formed to have a large diameter with respect to an opening 41a on one end, and a tapered portion 41c is formed at an intermediate portion to expand toward the other end. A flange 41d extending outward is formed in the opening 41b on the other end side.

In this case, the inner surfaces of the tapered portion 41c and the opening 41b surround the stator winding 25,
1d substantially faces the end ring 32a of the rotor 22. Also in this embodiment, as indicated by the arrows, the airflow flowing inside and outside the motor 21 through the periphery of the stator winding 25 is reliably formed, and the cooling effect is remarkably improved.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, the position of the stator winding 25 is slightly inner than that of the second embodiment. Accordingly, the shape of the guide member 42 is slightly different. The guide member 42 has a substantially straight cylindrical shape from an opening 42a on one end to an opening 42b on the other end, and a flange 42 extending outward from the opening 42b on the other end.
c is formed.

In this case, the inner surface of the opening 42b surrounds the stator winding 25, and the flange 42c is substantially opposed to the end ring 32a of the rotor 22. Also in this embodiment, the stator winding 2
5, the airflow flowing inside and outside the motor 21 through the periphery is reliably formed, and the cooling effect is remarkably improved.

FIGS. 6 to 8 show a fourth embodiment of the present invention. This embodiment is different from the first embodiment in the following points. In this embodiment, the guide member 33,
The fourth embodiment is different from the first embodiment in that four axial fan blades 43 and 44 are provided inside 34. The axial fan blades 43 and 44 are formed in an inclined form (see FIGS. 8A and 8B) such that when the rotor 30 is rotated in the direction of arrow A, external air flows in the direction indicated by arrow Aa. Have been. The axial fan blades 43 and 44 have a flat surface on one surface and a substantially arc shape on the other surface.

In this case, the axial flow fan blades 43, 44 are more effective than the guide members 33, 34 for forming the air flow.
Strong blowing action. This axial fan blade 43,
When 44 is rotated in the direction of arrow A, as shown by arrow Aa, an airflow is generated in which the air flows inside the guide members 33 and 34 from one end to the other end.
As a result, the air outside the motor 21 is separated from the guide members 33, 3
4 flows into the stator winding 25 side, exits the other end side of the guide members 33 and 34, and flows out of the motor 21 through the outer periphery thereof.

When the rotor 22 is rotated in the opposite direction (the direction opposite to the direction of the arrow A), air flows in the opposite directions are forcibly generated inside the guide members 33 and 34, and as a result, the motor 21 outside air flows into the outer periphery of the guide members 33 and 34, and from the other end side, the guide member 3
3, 34, and flows around the stator winding 25,
One end of the guide members 33 and 34 flows out of the motor 21.

As described above, the guide members 33 and 34 form an air flow passage intensively passing around the stator winding 25, and the axial fan blades 43 and 44 increase the airflow of the air flow. In general, the cooling effect on the stator 22 is further improved, which can further contribute to a reduction in the volume of the stator 22 and a reduction in the size of the motor 21.

FIG. 9 shows a fifth embodiment of the present invention. In this embodiment, the point that axial fan blades 45 and 46 are provided outside the guide members 33 and 34 is the fourth embodiment. Different from the example. In this embodiment, the rotor 30
Is rotated, the axial flow fan blades 45, 46 forcibly generate an air flow in which air flows from the one end side to the other end side of the outer periphery of the guide members 33, 34, and as a result, Air outside the motor 21 flows around the guide members 33 and 34 as shown by an arrow D, flows into the guide members 33 and 34 from the other end side, and flows around the stator winding 25. As a result, it flows out of the motor 21 from the other end of the guide members 33 and 34.

When the rotor 30 is rotated in the reverse direction, an airflow is forcibly generated from the other end to the one end on the outer periphery of the guide members 33 and 34. As a result,
Air outside the motor 21 flows into the guide members 33 and 34 and flows to the stator winding 25 side.
3 and 34, and flows out of the motor 21 through the periphery of the other end of the motor 21.

In this embodiment, the same effects as those of the fourth embodiment can be obtained. In addition, since the diameters of the axial fan blades 45 and 46 are increased, the airflow of the air flow is further increased. The cooling efficiency for the stator 22 is further increased.

FIG. 10 shows a sixth embodiment of the present invention. In this embodiment, the point that the cross-sectional shape of the axial fan blades 43 and 44 is point-symmetrical at the center P thereof is the fourth point.
Is different from the embodiment (FIGS. 6 to 8). According to this embodiment, even if the rotor 22 is rotated in the direction of the arrow A or in the opposite direction, the same air blowing ability can be obtained, and the cooling effect can be improved regardless of the rotation direction of the motor 21. it can.

FIGS. 11 and 12 show a seventh embodiment of the present invention, which differs from the first embodiment in the following points. That is, the inner radial rib portions 28 of the bearing brackets 28, 29
d and 29d are formed in the shape of an axial fan blade. In this case, each of the ribs 28d and 29d has a flat surface on one side and a substantially circular arc on the other side.

In this embodiment, when the rotor 30 is rotated, for example, in the direction of arrow A, an air blowing action is generated such that external air is forced to flow into the guide members 33 and 34. As a result, air outside the motor 21 flows into the guide members 33 and 34 as shown by the arrow Aa, flows toward the stator winding 25 side, and
4 exits the other end side and passes through the outer periphery thereof so that the motor 21
It begins to flow out.

When the rotor 30 is rotated in the reverse direction, an air blowing action occurs in which the air inside the guide members 33 and 34 is forced to flow out of the motor 21. As a result, the air outside the motor 21 is generated. Air flows into the outer periphery of the guide members 33 and 34, and the guide member 3
3 and 34, and passes through the periphery of the stator winding 25, and flows out of the motor 21 from one end of the guide members 33 and 34.

As a result, concentrated cooling of the stator windings 25 can be achieved, and the air flow of the inner radial ribs 28d, 29d in the shape of the axial fan blades increases the airflow of the airflow. Of the stator 22 can be further improved, and the volume of the stator 22 can be reduced, and the motor can be further downsized. Further, the bearing bracket 2
Since the air is blown using the air blowers 8 and 29, the structure can be simplified as compared with a case where an axial fan blade is separately provided.

According to this embodiment, the air volume of the cooling air flow is further increased, the cooling effect on the stator 22 is further improved, and the volume of the stator 22 can be reduced, and the motor 21 can be further reduced in size. In this case, as shown in FIGS. 13 and 14 showing the eighth embodiment of the present invention, the outer radial rib portions 28e and 29e of the bearing brackets 28 and 29 may be formed in the shape of an axial fan blade.

In this embodiment, when the rotor 30 is rotated in the direction of arrow A, the radial ribs 28e,
29e, the guide member 33 as shown by the arrow Aa,
An airflow is forcibly generated from one end side to the other end side around the outside of the motor 34, and as a result, air outside the motor 21 flows into the outside circumference of the guide members 33 and 34, and From the inside of the guide members 33 and 34, passes around the stator winding 25, and flows out of the motor 21 from one end side inside the guide members 33 and 34.

When the rotor 30 is rotated in the reverse direction, an airflow is forcibly generated from the other end to the one end on the outer periphery of the guide members 33 and 34. As a result,
Air outside the motor 21 flows into the guide members 33 and 34 and flows to the stator winding 25 side.
The motors 3 and 34 exit the other end side and flow to the outside of the motor through the outer periphery. As a result, the same effect as that of the above-described seventh embodiment can be obtained. In particular, since the diameter of the outer radial ribs 28e and 29e can be increased, the air volume can be further increased and the cooling effect can be further improved. I do.

The outer radial ribs 28d, 29d or 28e, 29e of the axial fan blade shape may have a point symmetrical cross section at the center P as shown in FIG. 15 showing the ninth embodiment of the present invention. Well, in this case,
Regardless of the rotation direction of the rotor 22, the same air blowing capacity can be obtained, which can contribute to the improvement of the cooling effect.

FIGS. 16 to 18 show a tenth embodiment of the present invention, which differs from the first embodiment in the following points. That is, the stator 52 of the outer rotor type motor 51 is configured such that the stator core 54 is mounted on the outer peripheral surface of the fixed shaft 53 and the stator winding 55 is mounted. Further, the stator 5 on the fixed shaft 53
A pair of bearing brackets 58, 59 are rotatably provided on both sides via bearings 56, 57, and a rotor 60 is mounted on the bearing brackets 58, 59.
Thus, the rotor 60 is rotatably provided outside the stator 52. The rotor 60 includes a rotor yoke 61
And a rotor magnet 62 is mounted on the motor. Note that a load is attached to the outside of the rotor yoke 61.

The stator core 54 is provided with a plurality of ventilation portions 54a penetrating in the axial direction, and the air volume adjustment members 63 (see FIG. 18) are fitted and fixed to the openings at both ends. The bearing brackets 58 and 59 have a circular flat plate shape. On one bearing bracket 58, first air circulating portions 64 are formed at four circumferentially equal pitches, and on the other bracket 59, second air flowing portions are formed at four circumferentially equal pitches. A circulation section 65 is formed.

The first air circulating portion 64 has a first hole 64a formed in the bearing bracket 58 and a first hole 64a attached to the bearing bracket 58 so as to surround the first hole 64a. And a hood 64b. The first hood 64b has an opening 64c opening in the rotation direction of the rotor 60 (indicated by an arrow C).

The second air circulation portion 65 has a second hole 65a formed in the bearing bracket 59, and a second hole 65a attached to the bearing bracket 59 so as to surround the second hole 65a. And a hood 65b. The second hood 65b has an opening 65c opened in a direction opposite to the first hood 64b (a direction opposite to the arrow C).

In this embodiment, when the rotor 60 is rotated, the first hood 6 in the first air circulating section 64 is rotated.
4b, external air is taken into the first hole 64a, passes through the ventilation part 54a of the stator core 54, and passes through the second hole 65a of the second air circulation part 65 and the second hood 65.
The motor comes out of the motor 51 through the opening b. By such air circulation, the inside of the motor 51 is air-cooled. As a result, the stator winding 55 is also cooled, which can contribute to a reduction in the volume of the stator 52 and a reduction in the size of the motor 51. When the rotor 52 is rotated in the reverse direction, the outside air is taken into the second hole 65a by the second hood 65b in the second air circulation unit 65, and The motor 51 passes through the first hole 64a of the first air circulating unit 64 and the opening of the first hood 65b to pass through the opening 54a to the outside of the motor 51. Therefore, the cooling effect can be improved regardless of the rotation direction of the motor 51.

FIGS. 19 to 21 show an eleventh embodiment of the present invention. In this embodiment, the structure of bearing brackets 71 and 72 is different from that of the tenth embodiment.
That is, since the bearing brackets 71 and 72 have the same configuration, the bearing bracket 71 will be described. The bearing bracket 71 has a configuration including a bearing housing portion 71a, an annular rib portion 71b, and a radial rib portion 71c for connecting the bearing housing portion 71a, the annular rib portion 71b, and the radial rib portion 71c.
It is formed in a general axial fan blade shape having a slightly narrow base end and a slightly wide front end. The other bearing bracket 72 has a bearing housing portion 72a of the same configuration, an annular rib portion 72b, and a radial rib portion 72c.

In this embodiment, when the rotor 60 is rotated, for example, in the direction of arrow A, the bearing bracket 7
1 and 72 also rotate, and the radial rib portions 71c and 72c in the form of axial fan blades generate a blowing action, and as shown by an arrow Aa, external air flows into the motor 51 from one bearing bracket 71 side. Flows into the air vent 54
a, etc., and comes off to the other bearing bracket 72 side. As a result, the stator winding 55 is also cooled, which can contribute to a reduction in the volume of the stator 52 and a reduction in the size of the motor. In this embodiment, the cross-sectional shape of the radial ribs 71c and 72c is set to be symmetrical with respect to the center line L, and if the rotor 60 is rotated in the opposite direction, the air flow will also be in the opposite direction. By flowing, the same operation and effect can be obtained, which can contribute to the improvement of the cooling effect regardless of the rotation direction of the motor 51. The cross-sectional shape of the radial rib portions 71c and 72c may be the shape shown in FIG. 8 or the shape shown in FIG.

FIG. 22 shows a twelfth embodiment of the present invention. This embodiment differs from the eleventh embodiment in the following points. That is, the bearing brackets 81 and 82 have a non-porous single plate shape, and have a substantially hollow first hollow portion 83a extending to an intermediate portion in the axial direction at one end side of the fixed shaft 83, At the end side, a substantially hollow second hollow portion 83b extending to a middle portion in the axial direction is formed.
Therefore, the partition wall part 83c exists in the middle part.

Further, a first communication hole 83 communicating with the space on one end side of the stator 52 is formed in the peripheral wall of the first cavity 83a.
d, and a second communication hole 83 communicating with a space on one end side of the stator 52 on the peripheral wall of the second cavity 83b.
e. Axial fans 84 and 85 serving as fans are provided in the openings of the first cavity 83a and the second cavity 83b. The axial fans 84, 85
A drive circuit (not shown) controls the drive when the motor 51 is driven.
Air is blown in the directions indicated by 1 and F2.

In the above configuration, when the fans 84 and 85 are rotated, the first cavity 83a
Flows into the space on one end side of the stator 52 through the first communication hole 83d, and flows through the ventilation portion 54 of the stator core 54.
a through the second communication hole 83e to the second cavity 8
3b and exits through the second cavity 83b. When the fans 84 and 85 are rotated in opposite directions,
The air flow is reversed as described above. With such an air flow,
The stator 52 can be reliably cooled.
The fans 84 and 85 may have at least one of them.

FIG. 23 shows a thirteenth embodiment of the present invention. This embodiment differs from the eleventh embodiment (FIGS. 19 to 21) in the following points. That is, in this embodiment, the fixed shaft 53 is formed in a hollow shape that is open in the axial direction, and axial fans 86 and 87 are provided at the openings at both ends. These fans 86 and 87 blow air in the directions indicated by arrows F1 and F2 when driven.

In this embodiment, the stator 52 is cooled by the cooling action by the blowing action of the radial rib portions 71c, 72c in the form of axial fan blades and by the cooling action from the inside of the fixed shaft 53 by the blowing action of the fans 86, 87. Can be cooled, and the cooling effect can be further enhanced.

[0072]

As is apparent from the above description, the present invention has an excellent effect that the stator can be cooled well and the volume of the stator can be reduced, and the motor can be downsized. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a motor showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a guide member.

FIG. 3 is a sectional view taken along the line VV in FIG. 1;

FIG. 4 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 7 is a diagram corresponding to FIG. 3;

FIG. 8 is a cross-sectional view of an axial fan blade portion in a developed state.

FIG. 9 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 8, showing a sixth embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention.

FIG. 12 is a sectional view of the inner radial rib portion in a developed state.

FIG. 13 is a view corresponding to FIG. 1, showing an eighth embodiment of the present invention;

FIG. 14 is a cross-sectional view of an outer radial rib portion in a developed state.

FIG. 15 is a view corresponding to FIG. 12, showing a ninth embodiment of the present invention;

FIG. 16 is a view corresponding to FIG. 1, showing a tenth embodiment of the present invention;

FIG. 17 is a perspective view of a bearing bracket.

FIG. 18 is a perspective view of an air volume adjusting member.

FIG. 19 is a view corresponding to FIG. 1, showing an eleventh embodiment of the present invention;

FIG. 20 is a diagram corresponding to FIG. 3;

FIG. 21 is a sectional view of a radial rib portion in an unfolded state.

FIG. 22 is a view corresponding to FIG. 1, showing a twelfth embodiment of the present invention;

FIG. 23 is a view corresponding to FIG. 1 showing a thirteenth embodiment of the present invention.

FIG. 24 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 25 is a view corresponding to FIG. 3 of the bearing bracket.

[Explanation of symbols]

21 is an outer rotor type motor, 22 is a stator, 23 is a fixed shaft, 24 is a stator core, 25 is a stator winding, 26,
27 is a bearing, 28 is a bearing bracket, 28a is a bearing housing, 28b is an inner annular rib, 28c is an outer annular rib, 28d is an inner radial rib, 28e is an outer radial rib, and 28f is an inner opening. , 28g are outer openings, 29 is a bearing bracket, 30 is a rotor, 31 is a rotor core, 32 is a rotor conductor, 32a is an end ring,
33, 34, 41, and 42 are guide members;
5 and 46 are axial fan blades, 51 is an outer rotor type motor, 52 is a stator, 54 is a stator core, 54a is a ventilation hole, 55 is a stator winding, 58 and 59 are bearing brackets, and 60 is a rotor. , 61 is a rotor yoke, 62 is a rotor magnet, 63 is an air volume adjusting member, 64 is a first air circulation unit,
64a is a first hole portion, 64b is a first hood, 65 is a second air circulation portion, 65a is a second hole portion, 65b is a second hood, 71 is a bearing bracket, 71a is a bearing housing portion, 71b is an annular rib portion, 71c is a radial rib portion,
72 is a bearing bracket, 72a is a bearing housing part, 7
2b is an annular rib portion, 72c is a radial rib portion, 83 is a fixed shaft, 83a is a first hollow portion, 83b is a second hollow portion,
83d is the first communication hole, 83e is the second communication hole, 8
Reference numerals 4 and 85 denote axial fans (fans).

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Katsumi Kurosawa 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu Plant of Toshiba Corporation 5H609 BB18 PP02 PP06 PP07 PP08 PP09 QQ02 QQ12 QQ13 RR03 RR05 RR06 RR17 RR24 RR27 RR32 RR38 RR42 RR44 RR69 RR73

Claims (11)

[Claims] 1. A stator which is attached to a fixed shaft and has a stator core and a stator winding, and is rotatably provided via bearings located on both sides of the stator on the fixed shaft. A pair of air-permeable bearing brackets, and a rotor having both end portions attached to the outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator; An outer rotor type motor comprising: a guide member having one end attached to the inner surface of the bearing bracket and the other end surrounding the outer periphery of the stator winding. 2. A stator attached to a fixed shaft, having a stator core and a stator winding, and provided on both sides of the stator on the fixed shaft to be rotatable via bearings. A pair of air-permeable bearing brackets, and a rotor having both end portions attached to the outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator; A guide member having one end attached to the inner surface of the bearing bracket and the other end surrounding the outer periphery of the stator winding; and an axial fan blade provided inside the guide member. Outer rotor type motor. 3. A stator attached to a fixed shaft and having a stator core and a stator winding, and rotatably provided via bearings located on both sides of the stator on the fixed shaft. A pair of air-permeable bearing brackets, and a rotor having both end portions attached to the outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator; A guide member having one end attached to the inner surface of the bearing bracket and the other end surrounding the outer periphery of the stator winding; and an axial fan blade provided on an outer portion of the guide member. Outer rotor type motor. 4. The outer rotor type motor according to claim 2, wherein the axial fan blade has a symmetrical cross section. 5. A stator mounted on a fixed shaft and having a stator core and a stator winding, and provided on both sides of the fixed shaft on the stator so as to be rotatable via bearings. , A bearing housing portion, an inner annular rib portion having a larger diameter than this, an outer annular rib portion having a larger diameter than the inner annular rib portion, and an inner radial connecting the bearing housing portion and the inner annular rib portion. A pair of bearing brackets each having a rib portion, an outer radial rib portion connecting the inner annular rib portion and the outer annular rib portion, and outer annular ribs at both end portions of the pair of bearing brackets A rotor attached to a portion and rotatably provided around the outer periphery of the stator; a rotor as a whole, one end of which is attached to the inner surface of the inner annular rib portion of the bearing bracket and the other end thereof Side surrounds the stator winding circumference An outer rotor type motor comprising: a guide member having a form; and wherein the inner radial rib portion is formed in an axial fan blade shape. 6. A stator attached to a fixed shaft and having a stator core and a stator winding, and rotatably provided via bearings located on both sides of the stator on the fixed shaft. , A bearing housing portion, an inner annular rib portion having a larger diameter than this, an outer annular rib portion having a larger diameter than the inner annular rib portion, and an inner radial connecting the bearing housing portion and the inner annular rib portion. A pair of bearing brackets each having a rib portion, an outer radial rib portion connecting the inner annular rib portion and the outer annular rib portion, and outer annular ribs at both end portions of the pair of bearing brackets A rotor attached to a portion and rotatably provided around the outer periphery of the stator; a rotor as a whole, one end of which is attached to the inner surface of the inner annular rib portion of the bearing bracket and the other end thereof Side surrounds the stator winding circumference An outer rotor type motor comprising: a guide member having a form; and the outer radial rib portion formed in an axial fan blade shape. 7. The outer rotor type motor according to claim 5, wherein the radial rib portion having the shape of the axial fan blade has a symmetrical sectional shape. 8. A stator mounted on a fixed shaft and having a stator core and a stator winding, and rotatably provided via bearings located on both sides of the stator on the fixed shaft. A pair of bearing brackets, a rotor having both end portions attached to outer peripheral portions of the pair of bearing brackets and rotatably provided around the outer periphery of the stator, and one of the pair of bearing brackets. A first hood having a first hole formed so as to communicate between the inside and the outside thereof, and a first hood provided in a form surrounding the first hole and having a rotation direction side opened; And a second hole formed to communicate the inside and outside with the other of the pair of bearing brackets, and the second hole is provided in a form surrounding the second hole. The second hood opened in the opposite direction to the hood Outer rotor type motor comprising a second air distribution part comprising and a de. 9. A stator attached to a fixed shaft, having a stator core and a stator winding, and provided on both sides of the stator on the fixed shaft so as to be rotatable via bearings. A pair of bearing brackets, and a rotor having both ends attached to outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator. An outer rotor type motor comprising: an annular rib portion; and a radial rib portion connecting the annular rib portions, and the radial rib portion has an axial fan blade shape. 10. The outer rotor type motor according to claim 9, wherein the radial rib portion has a symmetrical cross-sectional shape. 11. A stator mounted on a fixed shaft and having a stator core and a stator winding, and rotatably provided via bearings located on both sides of the stator on the fixed shaft. Bearing bracket, and a rotor whose both end portions are attached to outer edges of the pair of bearing brackets and rotatably provided around the outer periphery of the stator, and penetrates the stator core in the axial direction. Forming a ventilation portion, forming a substantially hollow first cavity extending halfway in the axial direction at one end of the fixed shaft, and forming a substantially hollow shape extending halfway in the axial direction at the other end of the fixed shaft; A second cavity is formed, a first communication hole communicating with a space at one end of the stator is formed in a peripheral wall of the first cavity, and a stator is formed in a peripheral wall of the second cavity. Forming a second communication hole communicating with a space on one end side, the first cavity; And a fan provided in at least one of the second hollow portion and the outer rotor type motor.