JPS6155330B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an outer rotor motor, and in particular,
This invention relates to an outer rotor motor whose motor frame is made of microwave oven material.

[Background of the invention]

Conventional motors with a motor frame made of microwave oven material were mainly of the inner rotor type, but when used as a fan motor etc., an outer rotor type was used, which makes it easy to attach the fan directly to the rotor. This is very advantageous and has a great effect on making the product more compact.

However, in order to reduce the temperature rise, which is a drawback of this outer rotor system, it is essential to use microwave oven material, so it is necessary to cover the entire stator coil portion with the microwave oven material.

That is, FIG. 1 is a schematic structural diagram of a conventional example, in which 1 is a rotor, 2 is a bearing, and 3 is a schematic structural diagram of a conventional example.
is a stator, 4 is a coil, and 5 is a resin frame.

A so-called rotor 1 is supported by bearings 2,
This is an inner rotor type that has a structure that rotates inside the stator 3, and a coil 4 is wound around the stator 3, and the stator 3 is covered with a resin material of a resin frame 5. It is.

For the reason stated above, if the inner rotor type drive unit as in the above-mentioned conventional example is replaced with an outer rotor type drive unit, the configuration will be as shown in FIG. 2, for example.

In Fig. 2, 1A is a rotor, 2A is a bearing, 3A is a stator, 4A is a coil, 5A is a
is a resin frame.

That is, it is an outer rotor type in which a stator 3A and a rotor 1A are supported by a bearing 2A, and the rotor 1A rotates outside the stator 3A.

However, in creating such a structure, it becomes impossible to cover the outer periphery of the stator 3A with a resin material as in the inner rotor motor shown in FIG. In reality, it is not possible to obtain the configuration shown in FIG.

However, as illustrated in FIG. 2, it is actually impossible to reduce the temperature rise of the coil 4A unless the rotor 1A side and the resin frame 5A side of the coil 4A are filled with resin material. It is not possible to provide an outer rotor as a fan motor.

In addition, for filling the resin material, in the case where the stator winding of an inner rotor type electric motor is surrounded by synthetic resin, gates are provided as resin flow paths in all slots formed on the inner circumferential surface of the stator core. At the same time, a structure of a motor stator in which the resin portion of each slot is recessed from the inner circumferential surface of the stator core is described in Japanese Patent Laid-Open No. 133403/1983.

In this case, the entire slot on the inner peripheral surface of the stator core is used as a gate, and the gate is recessed inside the slot so that it does not protrude beyond the inner peripheral surface of the iron core. It also serves as a resin flow path.

However, when the slot is used as a gate in this way, the volume occupied by the stator winding changes depending on the motor capacity.
The size of the inflow path after the almost constant capacity gate using the slot is indefinite, and smooth flow of the resin cannot be expected, and the resin covering the stator windings may be shot or flowed. It is difficult to use it in practice because the resin burrs become too good.

Next, it is difficult to convert such a device to an outer rotor type device.

In other words, if an inner rotor type and an outer rotor type have the same output, the inner rotor outer diameter of the inner rotor type and the outer rotor inner diameter of the outer rotor type must be the same. Accordingly, the slot cross-sectional area of the stator located on the inside of the outer-rotor type stator is necessarily smaller than the slot cross-sectional area of the stator located on the outside of the inner-rotor type.

Since the output is the same and the cross-sectional area of the winding is the same, in the stator slots of the outer rotor motor type, all slots on the inner peripheral surface of the stator core are gated, as described in the above publication. There is no room to use it as such.

As a result, it is difficult to apply the device described in the above publication to an outer rotor type device.

Furthermore, in the case of the one described in the above publication, when forming the gate shape, the use of the entire slot and the point of the shape are taken into consideration.
It has the drawback of poor productivity in its manufacture.

[Purpose of the invention]

It is an object of the present invention to provide an outer rotor motor that solves the problems of the prior art as described above, makes it fully possible to manufacture it, and has good productivity. .

[Summary of the invention]

The structure of the outer rotor motor according to the present invention is such that the outer rotor motor has a stator and a rotor supported by a bearing, and the rotor rotates outside the stator. A stator core with a gate hole provided on its side is formed so that resin material can be filled from one side to the other side, and a stator is formed by winding a coil, and the gate hole guides the resin material. using
A motor frame is formed by covering at least the entire coil portion of the stator with a resin material, and a rotor is mounted on the motor frame.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the figure, 1B is a rotor, 2B is a bearing,
3B is stator, 3C is stator core, 4B
is a coil, 5B is a resin frame which is a motor frame, and 6 is a gate hole provided in the stator core 3C.

According to the above, in the outer rotor motor in which the stator and rotor are supported by a bearing and the rotor rotates outside the stator, a resin resin plate other than the illustrated slot opening of the stator core 3C is used. Gate hole 6 for guiding material
By the stator core 3C provided on the side,
The stator 3B is formed so that it can be filled with resin material from one side to the other side, and the stator 3B is constructed by winding the coil 4B. A resin frame 5B is formed by covering at least the entire portion of the coil 4B with a resin material, and the rotor 1B is attached to the resin frame 5B via a bearing 2B.

That is, stator 3B as shown in FIG.
A gate hole 6 for guiding the resin material is provided in the stator core 3C constituting the stator core 3C, which is separate from the slot opening, so that the resin material can flow smoothly. The structure is such that the rotor 1B side (the left side in FIG. 3) can also be easily filled, thereby making it possible to create an outer rotor motor as shown in FIG. 3.

This gate hole 6 can be formed extremely easily by simple punching.

Based on the above configuration, it has been possible to provide an outer rotor motor with high productivity, which can be expected to have a great effect on making the product more compact.

However, as shown in FIG. 3, in the above embodiment, at least the entire coil portion is made of resin material in order to ensure an air gap between the rotor 1B and the stator 3B, and to press fit the shaft into the stator 3B. However, during filling manufacturing, the resin material may flow into the outer periphery, inner periphery, etc. of the stator 3B, but this is only a thin layer or only partially, and there is no problem in practical use. It is something.

〔Effect of the invention〕

In summary, according to the present invention, it is possible to easily manufacture an outer rotor motor filled with resin material, and in short, it has been made possible by solving the problems that were conventionally considered impossible. At the same time, it is possible to provide small and compact products with good productivity, including thinness, and can be said to be an invention with excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a conventional inner rotor motor, FIG. 2 is an exemplary structural sectional view of an outer rotor motor, FIG. 3 is a schematic sectional view of an outer rotor motor according to an embodiment of the present invention, and FIG. The figure is a plan view of the stator core. 1B... Rotor, 2B... Bearing, 3B... Stator, 3C... Stator core, 4B... Coil,
5B...Resin frame, 6...Gate hole.

Claims (1)

[Claims] 1 In an outer rotor motor in which the stator and rotor are supported by a bearing and the rotor rotates outside the stator, a gate hole for guiding the resin material is provided on the side surface of the motor, which is separate from the slot opening of the stator core. The stator core is formed so that it can be filled with cooking range material from one side to the other, and a stator is formed by winding a coil, and a gate hole for guiding the cooking range material is used to form at least one part of the stator core. An outer rotor motor characterized in that a motor frame is formed by covering the entire coil part with microwave material, and a rotor is mounted on the motor frame.