JP2000184644A - Outer rotor motor and apparatus provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an outer rotor motor which is used for an OA apparatus, which improves a cooling effect, which is small and which can obtain a high output. SOLUTION: This outer rotor motor is constituted in such a way that a rotor surrounds the circumference of a stator so as to be rotatable, that the rotor frame 17 of the rotor is formed in a cup shape which comprises a disk part 17a, a cylinder part 17b continued to it and an opening part 25, that a ventilation hole 24 is formed in the disk part 17a, and that the winding 16 of the stator is cooled by a ventilating operation. The size of the ventilation holes 24 is set in such a way that a mounting screw (a mounting member) 7 which attaches the outer rotor motor to an apparatus is not passed. As a result, a foreign matter such as the mounting screw 7 will not enter the inside of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer rotor motor mainly used for OA equipment such as a copying machine, a printer, a facsimile and the like, and an apparatus provided with the outer rotor motor.

[0002]

2. Description of the Related Art When downsizing and increasing the output of an outer rotor motor used for equipment, heat generated from the windings of a stator poses a safety problem.

FIG. 8 shows an example of a conventional outer rotor motor. FIG. 8A is a diagram viewed from the axial direction.
(B) is sectional drawing seen from the side surface.

Referring to FIG. 8, in a conventional outer rotor motor, a stator winding 1 is surrounded by a rotor frame 2, a housing 3 forming a base, and a printed circuit board 4, and a cooling fan is provided on the top surface of the rotor frame 2. 5 is provided.

In the structure of the outer rotor motor, heat is accumulated inside the rotor frame 2 because the winding 1 that generates heat is wrapped around the rotor frame 2 and the housing 3 and the printed circuit board 4 that constitute the base. .

In this conventional example, a fan 5 for cooling is provided on the top surface of the rotor frame 2 to cool the rotor frame 2 and indirectly cool the windings 1.

However, this structure does not have a good cooling effect because it does not directly cool the winding 1 of the stator.

[0008]

In order to directly cool the stator winding which generates heat, a method of forming a ventilation hole in the rotor is conceivable. However, for equipment such as copiers, disassembly, adjustment, and
Repair work such as replacement occurs. Generally, a plurality of outer rotor motors are arranged in a complicated manner on a side plate surface of a device, such as wiring cables and control boards. Mounting members such as mounting screws often drop during repair work.

Accordingly, the present invention provides a ventilation hole in the rotor and enhances the cooling effect of the outer rotor motor, while preventing foreign matters such as mounting screws from entering the inside of the outer rotor motor, thereby reducing the size of the outer rotor motor. The purpose is to realize high output.

[0010]

In order to achieve the above object, an outer rotor motor according to the present invention comprises a stator having a stator core and a winding wound thereon, a disk portion, a cylindrical portion following the disk portion, and an open end. A rotor having a cup-like shape and rotatably surrounding the periphery of the stator, and a plurality of ventilation holes having a size that does not allow the mounting member to pass through the rotor frame, or a plurality of opening holes in the rotor frame and the vicinity thereof And a foreign matter intrusion prevention member for preventing the attachment member from passing therethrough.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be practiced by adopting the constitution described in each claim. However, in order to easily understand the practice of the present invention, the operation in addition to the constitution will be described below.

According to a first aspect of the present invention, there is provided a stator comprising a stator, a rotor, a shaft, and a base, wherein the base holds the stator disposed concentrically with the shaft forming the center of rotation. Has a stator core and a winding wound therearound, the rotor has a cup-shaped rotor frame having a disk portion, a subsequent cylindrical portion, and an open end, and is arranged concentrically with the shaft, The rotor frame is rotatably surrounded, and the rotor frame has a plurality of ventilation holes through which air for cooling the stator windings passes. This is an outer rotor motor having the above configuration.

As described above, by providing the rotor with a ventilation hole having a size that does not allow the mounting member to pass through, it is possible to prevent foreign matter from entering the inside of the rotor and to obtain air permeability inside the rotor, so that the cooling effect of the outer rotor is reduced. good.

[0014] The invention described in claim 2 of the present invention provides:
According to the first aspect of the present invention, the ventilation hole has a radial and slit shape, and has a wall surface inclined from one end of the ventilation hole with respect to the rotation direction.

Therefore, the rotor frame is provided with a slit-shaped ventilation hole having a size that does not allow the mounting member to pass through, and one end of the ventilation hole is inclined in the rotation direction to introduce air into the rotor. And a cooling effect inside the rotor can be obtained.

[0016] The invention according to claim 3 of the present invention provides:
Including a stator, a rotor, a shaft, and a base,
The base holds a stator concentrically arranged with a shaft serving as a center of rotation.The stator has a stator core and windings wound therearound, and the rotor has a disk portion, a subsequent cylindrical portion, and an open end. Having a cup-shaped rotor frame having, and being arranged concentrically with the shaft and rotatably surrounding the stator, the rotor frame includes:
There are a plurality of opening holes through which air for cooling the windings of the stator can pass, and a foreign matter intrusion prevention member that prevents the mounting member for attaching the outer rotor motor to the equipment from passing through the opening hole is arranged near the opening hole. This is an outer rotor motor having a configuration.

Therefore, by providing an opening hole in the rotor frame and disposing a foreign matter intrusion prevention member near the opening to prevent the mounting member from passing through the opening hole, foreign matter can be prevented from entering the inside of the rotor and besides entering the rotor. Air permeability is obtained.

Further, the invention according to claim 4 of the present invention provides:
In the invention described in claim 3, the foreign substance preventing member is an outer rotor motor configured as a fan having a plurality of blades.

Therefore, a foreign matter intrusion prevention member integrated with a fan for preventing the mounting member from passing through the opening hole is disposed near the opening hole provided in the rotor, and prevents foreign matter from entering the inside of the rotor. A high cooling effect inside the rotor can be obtained.

The invention according to claim 5 of the present invention provides:
4. The outer rotor motor according to claim 1, wherein a fan having a plurality of blades is provided in the vicinity of the ventilation hole or the opening hole, and thus the fan is arranged in the vicinity of the permeable rotor. Thus, a positive cooling effect inside the rotor can be obtained.

The invention according to claim 6 of the present invention provides:
In the outer rotor motor according to any one of claims 1 and 3, the vent hole or the opening hole is formed in a slit shape. Therefore, the ventilation hole or the opening hole of the rotor frame is formed in a slit shape to increase the opening area, so that high air permeability to the inside of the rotor can be obtained.

The invention according to claim 7 of the present invention provides:
4. An apparatus provided with the outer rotor motor according to claim 1, further comprising: a member facing the opening end of the rotor frame with a gap, and the gap between the opening end and the member facing the opening is passed by the mounting member. It is not sized. Therefore, by setting the size such that the mounting member does not pass through the gap from the opening end of the rotor frame, it is possible to prevent foreign matter from entering the inside of the rotor.

[0023] The invention described in claim 8 of the present invention provides:
An apparatus provided with the outer rotor motor according to any one of claims 1 to 7, which has the advantages of the outer rotor motor according to any one of claims 1 to 7. .

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a structural view showing an outer rotor motor according to Embodiment 1 of the present invention. FIG.
FIG. 1A is a plan view as viewed from the axial direction, and FIG. 1B is a cross-sectional view as viewed from the side. FIG. 2 is a diagram in which an outer rotor motor is attached to the device according to the first embodiment of the present invention with mounting screws (attachment members). FIG. 2A is a side view of the entire device.
(B) is a side view near the outer rotor motor.

With reference to FIG. 2, a description will be given of a structure for mounting the outer rotor motor to the equipment and a flow of air. The outer rotor motor 6 is mounted on a mounting plate 10 such as a copying machine main body 8 or a document feed unit 9 with mounting screws 7. A plurality of outer rotor motors 6 are arranged in the copying machine body 8 or the document feed unit 9. The solid arrow indicates the flow 12 of the copy sheet to the sheet discharge tray 11. The axial fan 13 faces the outer rotor motor 6, and the dashed arrows indicate the air flow 14.

In FIG. 1, the stator includes a stator core 15 and a winding 16 wound around the stator core 15. The rotor has a rotor frame 17, which has a disk portion 17a followed by a cylindrical portion 1a.
7b and an opening end, a shaft 18 which forms a center of rotation at the center of the disk portion 17a of the rotor frame 17, and a stator core 15 which is formed at the inner periphery of the rotor frame 17.
And a rotor magnet 19 that is magnetized in the radial direction and is arranged to face the rotor magnet 19. The base includes two bearings 20 that support the shaft 18, a printed circuit board 21 on which electric wiring is provided, and a housing 22 that supports the bearing 20 and the printed circuit board 21. The printed circuit board 21 and the housing 22 have mounting holes 23 into which the mounting screws 7 are fitted.

The housing 22 is fixed to the stator core 15, the bearing 20, and the printed circuit board 21, and is fixed to the copying machine main body 8 or the document feed unit 9 with the mounting screw 7. The rotor frame 17 is fixed to a shaft 18 and a rotor magnet 19. The shaft 18 is supported by bearings 20 so that the entire rotor can rotate around the stator.

The rotor frame 17 has twenty-four slit-shaped ventilation holes 24 sized so that the mounting screws 7 do not pass therethrough. The gap 26 between the open end 25 of the rotor frame 17 and the printed circuit board 21 facing the open end 25 has a size that the mounting screw 7 does not pass through.

Due to the restriction on the size of the ventilation holes 24 and the gaps 26, foreign substances such as the mounting screws 7 are prevented from being mixed, and the reliability from assembly to maintenance can be improved.

When power is supplied to the winding 16 via the printed circuit board 21, the stator core 15 is poled, the opposing rotor magnet 19 repels the stator core 15, and the entire rotor rotates about the shaft 18. The winding 16 generates heat by power supply and heats the air inside the rotor. Air flow 14 such as axial flow fan 13 facing rotor frame 17
Penetrates into the rotor through the vent hole 24 and pushes the heated air into the gap 26. The air flow 14 from outside the rotor, which is lower in temperature than the air inside the heated rotor,
6 is cooled directly.

The ventilation holes 24 allow the flow of air 14 into the rotor, thereby increasing the cooling effect and realizing a small, high-output outer rotor motor.

In this embodiment, since no additional members are required, an inexpensive outer rotor motor can be provided.

(Embodiment 2) FIG. 3 is a structural view showing an outer rotor motor according to Embodiment 2 of the present invention. FIG.
2A is a plan view as viewed from the axial direction, and FIG. 2B is a cross-sectional view as viewed from the side. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 3, the rotor frame 27 has twelve slit-shaped ventilation holes 28 extending substantially radially, and a wall surface 29 inclined from the one end of the slit-shaped ventilation hole 28 substantially in the rotational direction extends. .

Due to the restriction on the size of the ventilation hole 28, foreign matter such as the mounting screw 7 can be prevented from entering, and the reliability from assembly to maintenance can be improved.

When the rotor rotates, the wall surface 29 inclined with respect to the substantially rotational direction generates an air flow passing through the ventilation hole 28, and directly cools the inside of the rotor, thereby realizing a small, high-output outer rotor motor.

In this embodiment, since no additional members are required, an inexpensive outer rotor motor can be provided.

(Embodiment 3) FIG. 4 is a structural view showing an outer rotor motor according to Embodiment 3 of the present invention. FIG.
4A is a plan view as viewed from the axial direction, and FIG. 4B is a cross-sectional view as viewed from the side. FIG. 2 is a diagram in which the outer rotor motor according to the fourth embodiment of the present invention is mounted on the device with mounting screws, as shown in FIG. 2. The configuration of mounting the outer rotor motor on the device and the flow of air are the same as in FIG. The description is omitted because it is the same as the description.

In FIG. 4, the stator includes a stator core 30 and a winding 31 wound around the stator core 30. The rotor includes a cup-shaped rotor frame 32 having a disk portion, a cylindrical portion following the disk portion, and an open end, a shaft 34 serving as a rotation center at the center of the disk portion 32 a of the rotor frame 32, and an inner periphery of the rotor frame 32. And a rotor magnet 33 that is magnetized in the radial direction and is arranged to face the stator core 30. The base includes two bearings 35 that support the shaft 34, a printed board 36 on which electric wiring is provided, and a housing 37 that supports the bearing 35 and the printed board 36.
The printed board 36 and the housing 37 have mounting holes 38 into which the mounting screws 7 are fitted.

The housing 37 is fixed to the stator core 30, the bearing 35, and the printed circuit board 36, and is fixed to the copying machine main body 8 or the document feed unit 9 with the mounting screw 7 as shown in FIG. The rotor frame 32 is fixed to a shaft 34 and a rotor magnet 33. The shaft 34 is supported by bearings 35 so that the entire rotor can rotate around the stator.

The rotor frame 32 has four slit-shaped opening holes 39. In the vicinity of the opening hole 39, a foreign matter intrusion prevention member 40 is arranged. The foreign matter intrusion prevention member 40 has a large number of mesh-shaped ventilation holes 41 having a size that the mounting screw 7 cannot pass through. The gap 42 between the rotor frame 32 and the foreign matter intrusion prevention member 40 has such a size that the mounting screw 7 does not pass. The gap 44 between the open end 43 of the rotor frame 32 and the printed circuit board 36 facing the open end 43 has a size that the mounting screw 7 does not pass through.

Due to the restriction on the size of the ventilation hole 41, the gap 42 and the gap 44, foreign matter such as the mounting screw 7 is prevented from being mixed, and the reliability from assembly to maintenance can be improved.

When power is supplied to the winding 31 via the printed circuit board 36, the stator core 30 is poled, the opposing rotor magnet 33 repels the stator core 30, and the entire rotor rotates about the shaft 34. The winding 31 generates heat by power supply and heats the air inside the rotor. The air flow 14 such as the axial fan 13 shown in FIG. 2 facing the rotor frame 32 enters the rotor from the vent hole 41 and the opening hole 39 and pushes heated air into the gap 44. Air flow 14 from outside the rotor, which is cooler than the air inside the heated rotor, directly cools windings 31.

The ventilation hole 41 and the opening hole 39 allow the air flow 14 into the rotor, thereby increasing the cooling effect.
A small, high-output outer rotor motor can be realized.

Since the foreign matter intrusion prevention member separate from the rotor frame is not restricted by the rotor frame, the opening area can be increased.

Although the mesh-shaped ventilation holes are used in this embodiment, they may be slit-shaped.

(Embodiment 4) FIG. 5 is a structural view showing an outer rotor motor according to Embodiment 4 of the present invention. FIG.
5A is a plan view as viewed from the axial direction, and FIG. 5B is a cross-sectional view as viewed from the side.

In FIG. 5, the rotor frame 45 has four slit-shaped opening holes 46. In the vicinity of the opening hole 46, a fan 49 having twelve blades 47 and a large number of mesh-shaped ventilation holes 48 of such a size that the mounting screws 7 cannot pass through.
Has been arranged. The gap 50 between the rotor frame 45 and the fan 49 has such a size that the mounting screw 7 does not pass.

Due to the restriction on the size of the ventilation hole 48 and the gap 50, foreign matter such as the mounting screw 7 is prevented from being mixed, and the reliability from assembly to maintenance can be improved.

When the rotor rotates, the fan 49 having the ventilation hole 48 generates a flow of air passing through the ventilation hole 48 and the opening hole 46, directly cooling the inside of the rotor, and realizing a small, high-output outer rotor motor. .

In this embodiment, since the foreign matter entry preventing member and the fan are integrated, an inexpensive outer rotor motor can be provided.

In this embodiment, the mesh-shaped ventilation holes are used, but they may be slit-shaped.

(Embodiment 5) FIG. 6 is a structural view showing an outer rotor motor according to Embodiment 5 of the present invention. FIG.
FIG. 6A is a plan view seen from the axial direction, and FIG. 6B is a cross-sectional view showing a part in a side view.

In FIG. 6, the rotor frame 51 has 24 slit-shaped ventilation holes 52 of a size from which the mounting screws 7 do not pass from the top surface to the side surfaces. A fan 53 having twelve blades is arranged near the ventilation hole 52. The gap 54 between the rotor frame 51 and the fan 53 has such a size that the mounting screw 7 does not pass.

When the rotor rotates, the fan 53 generates a flow of air passing through the ventilation hole 52 to directly cool the inside of the rotor, thereby realizing a small, high-output outer rotor motor.

(Embodiment 6) FIG. 7 is a structural view showing an outer rotor motor according to Embodiment 6 of the present invention. FIG.
7A is a plan view as viewed from the axial direction, and FIG. 7B is a cross-sectional view as viewed from the side.

In FIG. 7, the rotor frame 55 has four slit-like opening holes 56. In the vicinity of the opening 56, a foreign matter intrusion prevention member 57 and a fan 58 having twelve blades are arranged. The foreign matter intrusion prevention member 57 has a large number of mesh-shaped ventilation holes 59 having a size through which the mounting screw 7 cannot pass. The gap 60 between the rotor frame 55 and the foreign matter intrusion prevention member 57 has such a size that the mounting screw 7 does not pass. The gap 61 between the foreign matter intrusion prevention member 57 and the fan 58 has a size that the mounting screw 7 does not pass through.

When the rotor rotates, the fan 58 generates a flow of air passing through the ventilation hole 59 and the opening hole 56 to directly cool the inside of the rotor, thereby realizing a small, high-output outer rotor motor.

In this embodiment, the ventilation holes are mesh-shaped, but they may be slit-shaped.

[0061]

As is apparent from the above description, according to the present invention, while increasing the cooling effect of the outer rotor motor,
Prevention of foreign matter such as mounting screws can be prevented, and reliability from assembly to maintenance can be improved.

Thus, the size and output of the outer rotor motor can be reduced.

[Brief description of the drawings]

FIG. 1A is a plan view of an outer rotor motor according to a first embodiment of the present invention viewed from an axial direction. FIG. 1B is a cross-sectional view of the outer rotor motor viewed from a side.

FIG. 2 (a) is a side view of the entire apparatus including the outer rotor motor according to the first and third embodiments of the present invention; and (b) a side view of the entire apparatus near the outer rotor motor.

3A is a plan view of an outer rotor motor according to a second embodiment of the present invention as viewed from an axial direction. FIG. 3B is a cross-sectional view of the outer rotor motor as viewed from a side.

4A is a plan view of an outer rotor motor according to a third embodiment of the present invention as viewed from an axial direction. FIG. 4B is a cross-sectional view of the outer rotor motor as viewed from a side.

5A is a plan view of an outer rotor motor according to a fourth embodiment of the present invention as viewed from the axial direction. FIG. 5B is a cross-sectional view of the outer rotor motor as viewed from the side.

6A is a plan view of an outer rotor motor according to a fifth embodiment of the present invention as viewed from an axial direction. FIG. 6B is a cross-sectional view showing a partial side surface of the outer rotor motor.

7A is a plan view of an outer rotor motor according to a sixth embodiment of the present invention as viewed from an axial direction. FIG. 7B is a cross-sectional view of the outer rotor motor as viewed from a side.

FIG. 8A is a plan view of a conventional outer rotor motor viewed from an axial direction. FIG. 8B is a cross-sectional view of the outer rotor motor viewed from a side.

[Explanation of symbols]

1, 16, 31 winding 2, 17, 27, 32, 45, 51, 55 rotor frame 3, 22, 37 housing 4, 21, 36 printed board 5, 49, 53, 58 fan 6 outer rotor motor 7 mounting screw ( 8 Copier body 9 Document feed unit 11 Paper discharge tray 12 Flow of copy paper 15, 30 Stator core 18, 34 Shaft 19, 33 Rotor magnet 23, 38 Mounting holes 24, 28, 41, 48, 52, 59 Ventilation Hole 29 Wall surface 39, 46, 56 Opening hole 40, 57 Foreign matter intrusion prevention member 42, 44, 50, 54, 60, 61 Gap 47 Blade

Continued on the front page F term (reference) 5H609 BB03 BB18 BB20 PP01 PP05 QQ02 QQ12 QQ14 QQ18 RR08 RR10 RR16 RR18 RR21 RR27 RR42 5H621 BB07 GA01 GA04 GB14 HH05 JK05 JK07 JK11 JK14 JK17 J0519CB05 A622

Claims (8)

[Claims] 1. A stator comprising a stator, a rotor, a shaft, and a base, wherein the base holds the stator disposed concentrically with the shaft forming a center of rotation, wherein the stator is wound around a stator core and a stator core. And the rotor has a cup-shaped rotor frame having a disk portion, a cylindrical portion following it, and an open end, and is disposed concentrically with the shaft and surrounds the stator. The rotor frame has a plurality of ventilation holes for allowing air for cooling the windings of the stator to pass therethrough, and the ventilation holes are large enough to prevent a mounting member for attaching an outer rotor motor to a device from passing therethrough. An outer rotor motor characterized by: 2. The outer rotor motor according to claim 1, wherein the ventilation hole has a radial and slit shape, and has a wall inclined from one end of the ventilation hole with respect to a rotation direction. 3. A stator comprising a stator, a rotor, a shaft, and a base, wherein the base holds the stator concentrically arranged with the shaft forming a center of rotation, wherein the stator is wound around a stator core and a stator core. And the rotor has a cup-shaped rotor frame having a disk portion, a cylindrical portion following it, and an open end, and is disposed concentrically with the shaft and surrounds the stator. The rotor frame has a plurality of opening holes through which air for cooling the windings of the stator is passed, and a mounting member for attaching an outer rotor motor to a device near the opening hole is provided in the rotor frame. An outer rotor motor in which a foreign matter intrusion prevention member for preventing passage through an opening hole is arranged. 4. The outer rotor motor according to claim 3, wherein the foreign matter preventing member is a fan having a plurality of blades. 5. The outer rotor motor according to claim 1, wherein a fan having a plurality of blades is provided near the ventilation hole or the opening hole. 6. The outer rotor motor according to claim 1, wherein the ventilation hole or the opening hole has a slit shape. 7. The rotor frame according to claim 1, further comprising a member opposed to the opening end of the rotor frame with a gap, wherein a gap between the opening end and the opposed member has a size that does not allow a mounting member to pass therethrough. The outer rotor motor according to any one of the above. 8. An apparatus comprising the outer rotor motor according to claim 1. Description: