JP3920450B2 - Outer rotor motor and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer rotor motor, and more particularly to protection of a rotary shaft bearing or power supply lead.
[0002]
[Prior art]
FIG. 5 is a side sectional view showing a conventional outer rotor motor shown in, for example, Japanese Utility Model Laid-Open No. 6-74056. Here, the stator 5 includes a stator core 2, a winding 1 wound around the stator core 2, and a resin 4 that molds the stator core 2 and the winding 1. On the other hand, the rotor 15 includes a rotor iron core 10, a rotor frame 11 that holds the rotor iron core 10, a rotating shaft 12, and the like. The rotating shaft 12 is held by bearings 8a and 8b arranged at intervals.
The bearing 8a on the output side of the rotor 15 and the rotary shaft 12 is covered and protected by the bracket 13, and the other bearing 8b is covered and protected by the end bracket 9.
Further, a power lead 16 that supplies power to the stator 5 is led to the wiring board 3 through a bush 17 that protects the power lead 16.
[0003]
In the outer rotor motor, the rotor 15 is rotated by a rotating magnetic field generated by the stator 5. At this time, the rotor 15 is rotatably supported by the bearings 8a and 8b around the rotation shaft 12.
[0004]
[Problems to be solved by the invention]
In such a conventional outer rotor motor, bearing protection and lead protection are performed by separate members each having a single function. Therefore, it is inconvenient in terms of bothering and assembling these parts. was there.
[0005]
The present invention has been made to solve the above-described problems, and an object thereof is to provide an outer rotor motor in which the number of parts is reduced and the assemblability is improved.
[0006]
[Means for Solving the Problems]
The outer rotor motor of the present invention includes a stator core molded simultaneously with a resin, a winding, and a wiring board. The stator takes in electricity through a power lead and generates a rotating magnetic field. In an outer rotor motor provided with a rotor that is arranged outside the rotor and rotates by the rotating magnetic field, and a pair of bearings that are held by the resin on the inner diameter portion of the stator core and support the rotation shaft of the rotor, One of the pair of bearings is configured to be protected by a rotor frame that holds an iron core of the rotor, and the wiring board is a surface of the stator that is opposite to a surface facing the inner bottom surface of the rotor. located in, said wiring board and said power supply lead connected by the inner bottom surface opposite to the surface of the rotor in the wiring board, wherein a bush is protected through the power lead pair An integral cover having both functions of the bearing protective material that protects the other bearing of the bearing, in which attached to the stator in a direction toward the inner bottom surface of the rotor from the wiring substrate.
[0007]
In addition, a stator core molded simultaneously with resin, a winding, and a wiring board, and a stator that takes in electricity through a power supply lead and generates a rotating magnetic field, is disposed outside the stator. One of the pair of bearings is an outer rotor motor comprising: a rotor that rotates by the rotating magnetic field; and a pair of bearings that are held on the inner diameter portion of the stator core by a resin and support the rotating shaft of the rotor. The wiring board is located on a surface of the stator opposite to the surface facing the inner bottom surface of the rotor, and the wiring board is protected by a rotor frame that holds the iron core of the rotor. the substrate and the power supply lead connected by surface opposite the inner bottom surface of the rotor in the wiring board, the functions and the pair of bearings for holding the power supply lead protection member for protecting through the power leads An integral cover having both functions of the bearing protective material that protects the other bearing, in which attached to the stator in a direction toward the inner bottom surface of the rotor from the wiring substrate.
[0008]
Further, the cover is attached to the stator by sharing a motor attachment member for attaching the motor to another member.
[0009]
Further, the cover includes a bearing holding portion that holds the bearing, and the cover is attached to the stator.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional side view of an outer rotor motor showing Embodiment 1 of the present invention. In FIG. 1, a stator 5 includes a stator core 2, a winding 1 wound around the stator core 2, a resin 4 for molding the stator core 2 and the winding 1 at the same time, a wiring board 3, and the like. On the other hand, the rotor 15 includes a rotor core 10, a rotor frame 11 that holds the rotor core 10, a rotating shaft 6, and the like. The rotating shaft 12 is held by the bearings 8a and 8b.
[0011]
The bearing 8 a on the output side of the rotary shaft 12 is protected by the rotor frame 11, while the other bearing 8 b of the rotary shaft 12 is protected by a cover 18 attached to the stator 5. Further, a bush portion 18 a that protects through a power supply lead 16 that supplies electricity to the stator 5 is integrally formed in a part of the cover 18.
[0012]
According to this example, the cover 18 has both a function for protecting the bearing 8b and a function as a bush for protecting the power supply lead 16, and is attached and fixed to the end face of the stator 5 by being inserted from one direction. I have to. In addition, it is good to use together screw fixation as needed. Therefore, since the number of parts is reduced and the assemblability is improved, quality improvement, standardization, and cost reduction can be achieved at the same time.
[0013]
Embodiment 2. FIG.
FIG. 2 is a cross-sectional side view of an outer rotor motor showing Embodiment 2 of the present invention. This is a modification of the fixing method of the cover 18 in the first embodiment. That is, the cover 18 is expanded to the position of the motor mounting hole 5a provided in the stator 5, and the cover mounting hole 18b is formed at the position of the cover 18 corresponding to the motor mounting hole 5a. Is fixed and attached. Thereby, the attachment process of the cover 18 can be simplified.
[0014]
Embodiment 3 FIG.
FIG. 3 is a cross-sectional side view of an outer rotor motor showing Embodiment 3 of the present invention. In this embodiment, a bearing holding portion 18c for holding the bearing 8b is formed on the cover 18 in the first embodiment by integral molding. As a result, vibration of the bearing 8b can be positively prevented.
[0015]
Embodiment 4 FIG.
FIG. 4 is a sectional side view of an outer rotor motor showing Embodiment 4 of the present invention. Instead of the bush portion 18a of the cover 18 of the first embodiment, a space for projecting the portion outward and holding the protection member for the power supply lead 16, that is, a power supply lead protection member holding portion 18d is formed. A power supply lead protection member 19 made of, for example, a tube or the like is inserted therein to protect the power supply lead 16.
[0016]
Needless to say, any combination of the modes described in the above embodiments is possible.
[0017]
【The invention's effect】
According to the motor of the first aspect of the present invention, since the integral cover having both functions of the bush protecting through the power supply lead and the bearing protective material protecting the bearing is attached to the stator, its assemblability and quality are improved. And cost can be improved effectively.
[0018]
According to the motor of the second aspect of the present invention, the integral cover having both the function of holding the power supply lead protection member that protects through the power supply lead and the function of the bearing protection material that protects the bearing is attached to the stator. Thus, the assemblability, quality and cost can be effectively improved here.
[0019]
According to the motor of the invention of claim 3, since the cover for protecting the bearing is attached to the stator by sharing the motor attachment member for attaching the motor to another member, the assembly process can be simplified.
[0020]
According to the motor of the invention of claim 4, since the cover for protecting the bearing having the bearing holding portion for holding the bearing is attached to the stator, problems such as assembling property and vibration of the bearing are improved at the same time. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of an outer rotor motor showing Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional side view of an outer rotor motor showing Embodiment 2 of the present invention.
FIG. 3 is a sectional side view of an outer rotor motor showing Embodiment 3 of the invention.
FIG. 4 is a cross-sectional side view of an outer rotor motor showing Embodiment 4 of the present invention.
FIG. 5 is a sectional side view showing a conventional outer rotor motor.
[Explanation of symbols]
1 Winding, 2 Stator Iron Core, 4 Mold Resin, 5 Stator, 5a Motor Mounting Hole, 8a, 8b Bearing, 10 Rotor Iron Core, 11 Rotor Frame, 12 Rotating Shaft, 15 Rotor, 16 Power Lead , 18 cover, 18a bushing portion, 18a cover mounting hole, 18c cover bearing holding portion, 18d power lead protection member holding portion.

Claims (4)

A stator core molded simultaneously with resin, a winding, and a wiring board; a stator that takes in electricity through a power supply lead and generates a rotating magnetic field; and is disposed outside the stator In an outer rotor motor comprising a rotor that rotates in a rotating magnetic field, and a pair of bearings that are held on the inner diameter portion of the stator core by the resin and support the rotating shaft of the rotor,
One of the pair of bearings is configured to be protected by a rotor frame that holds an iron core of the rotor,
The wiring board is located on the surface of the stator opposite to the surface facing the inner bottom surface of the rotor,
The wiring board and the power supply lead are connected on the surface of the wiring board opposite to the inner bottom surface of the rotor,
An integral cover having the functions of both a bush that protects through the power supply lead and a bearing protector that protects the other bearing of the pair of bearings, in a direction from the wiring board toward the inner bottom surface of the rotor. An outer rotor motor characterized by being attached to a stator. A stator core molded simultaneously with resin, a winding, and a wiring board; a stator that takes in electricity through a power supply lead and generates a rotating magnetic field; and is disposed outside the stator In an outer rotor motor comprising a rotor that rotates in a rotating magnetic field, and a pair of bearings that are held on the inner diameter portion of the stator core by the resin and support the rotating shaft of the rotor,
One bearing of the pair of bearings is configured to be protected by a rotor frame that holds an iron core of the rotor,
The wiring board is located on the surface of the stator opposite to the surface facing the inner bottom surface of the rotor,
The wiring board and the power supply lead are connected on the surface of the wiring board opposite to the inner bottom surface of the rotor,
An integral cover having both a function of holding a power supply lead protection member that protects through the power supply lead and a function of a bearing protection member that protects the other bearing of the pair of bearings is provided from the wiring board to the rotor. An outer rotor motor, which is attached to the stator in a direction toward the inner bottom surface .   The outer rotor motor according to claim 1, wherein the cover is attached to the stator by sharing a motor attachment member for attaching the motor to another member.   The outer rotor motor according to claim 1, wherein the cover includes a bearing holding portion that holds a bearing, and the cover is attached to the stator.

Images