JPH053642A - Motor cover and motor - Google Patents

Abstract

PURPOSE:To increase the outside air sucking capacity of the inlet port of a motor cover so as to improve the motor cooling effect of the inlet port by giving the function of an air guide to the inlet port. CONSTITUTION:A inlet port 6 is formed by cutting off part of a recessed section 13 provided around a bearing holding section 12 to produce a level difference C so that the bottom face 14 of the section can be used as an air guide. The outside air which flows in toward the central part through the inlet port 6 along the bottom face 14 circulates inside without stagnation and efficiently cools the heat radiating plates 3 and 4 of a motor M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor cover having improved cooling effect by improving ventilation and an electric motor provided with the electric motor cover.

[0002]

2. Description of the Related Art Generally, in an electric motor, as shown in FIGS.
, A partially cutaway sectional view of a conventional electric motor,
Due to its structure, the rotor 1 and the stator 2 around which the coil is wound easily generate heat. As shown in FIG. 3, the heat conducted from the rotor 1 to the radiator plate 3 and the heat conducted from the stator 2 to the radiator plate 4 are transferred from the intake port 6 of the motor cover 5 to the radiator plates 3 and 4. It was cooled by the air flow flowing to the exhaust port 7 via the. This air flow is created by the heat dissipation plate 3 which functions as a fan by the rotation of the rotor 1. Further, as shown in FIG. 4, a cooling fan 9 for forced cooling is attached to the tip of the shaft 8 of the rotor 1 to increase the intake amount of outside air, and a ventilation guide 10 is provided inside the motor cover 5. , The air flow is guided from the shaft 8 side to the heat dissipation plates 3 and 4 side to improve the cooling effect.

[0003]

However, in the structure shown in FIG. 3, the outside air sucked through the intake port 6 is indicated by arrows D, E, and F from the side of the shaft 8 toward the heat sinks 3 and 4.
There are many cases where the optimum route to the side is not passed. In this case, a part of the outside air is exhausted from the exhaust port 7 without cooling the heat radiating plate 3 of the rotor 1 and the heat radiating plate 4 of the stator 2 as indicated by an arrow G. Therefore, the outside air whose temperature has risen by removing heat from the radiator plates 3 and 4 loses its outlet, causing stagnation (recirculation) in the space 11 between the intake port 6 and the radiator plate 3. The stagnant outside air creates a wall of air in the vicinity of the intake port 6 and hinders the intake of the outside air from the intake port 6.
For this reason, the new intake amount of the outside air is reduced, and the cooling effect of the heat dissipation plates 3 and 4 is reduced.

Further, in the structure shown in FIG. 4, although the cooling effect of the heat radiating plates 3 and 4 is improved, the cooling fan 9 and the ventilation guide 10 are required, so that the complexity of manufacturing causes the cost increase. Was there.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and provide an electric motor cover having an improved cooling effect and an electric motor provided with the electric motor cover.

[0006]

In order to solve the above-mentioned problems, the present invention is directed to a side surface of the hollow portion on the bearing holding portion side of a hollow portion for sucking outside air provided around the bearing holding portion of the motor cover. Form a suction port by notching a part or notching a part of the side surface and a part of the bottom surface of the recessed portion,
The bottom of the notched recess was made to act as a ventilation guide for introducing outside air.

[0007]

According to the above structure, the outside air flowing into the recess is
The air is sucked from the intake port toward the shaft side, that is, toward the central portion side of the electric motor along the bottom surface of the hollow portion that plays the role of the ventilation guide. As a result, the outside air sucked from the intake port all flows along the shaft into the space formed by the radiator plate of the rotor and the shaft, and sufficiently cools the radiator plate of the rotor and the radiator plate of the stator. After that, the gas is exhausted from the exhaust port to the outside of the electric motor.

[0008]

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

FIG. 1 is a partially cutaway sectional view of the first embodiment of the present invention, and FIG. 2A is an enlarged view of the notched portion in FIG. Further, FIG. 2 (b) shows the second embodiment of the present invention.
FIG. 3 is a partially cutaway sectional view of the embodiment of FIG. In FIG. 1, the electric motor cover 5 is made of resin, and eight recesses 13 for sucking outside air are provided around the bearing holder 12. Bearing holding portion 12 of each recess 13
On the side of, the intake port 6 is formed by cutting out a part of the side surface and a part of the bottom surface of the recess 13. The bottom surface 14 of the recess 13 plays the same role as the ventilation guide 10 in FIG.

The radiator plate 3 rotates as the rotor 1 rotates. Along with this, the electric motor M that has taken heat from the heat sinks 3 and 4
The outside air inside is exhausted from the exhaust port 7. The fresh air corresponding to the amount exhausted is, as shown by a dashed arrow A, from the recess 13 to the bottom surface 1 serving as a ventilation guide.
4 is sucked from the intake port 6 to the shaft 8 side.
All the outside air sucked into the shaft 8 side is a space 15 formed by the six radiator plates 3 and the shaft 8 along the shaft 8.
Flows into. As shown by an arrow B, the outside air flowing into the space 15 absorbs the heat of the heat dissipation plate 3 by the rotation of the heat dissipation plate 3, and is then struck by the six heat dissipation plates 4 attached to the stator 2. The heat of the heat sink 4 is taken away. After that, the heated outside air is exhausted from the exhaust port 7 to the outside of the electric motor M.

In this embodiment, the number of the recessed portions 13 is 8 and the number of the heat radiation plates 3 and 4 is 6, respectively.
Applying any other numbers will do.

Next, the construction of the intake port 6 will be described with reference to the claims with reference to FIGS. 2 (a) and 2 (b).

First, in FIG. 2A, a part of the side surface and the bottom surface of the hollow 13 are formed so that a step C is formed on the bearing holding portion 12 side of the hollow portion 13 provided around the bearing holding portion 12. The intake port 6 is formed by cutting out a part of it. Intake 6
Since there is a step C on the
The bottom surface 14 of 3 plays the same role as the ventilation guide 10 in FIG. The flow of the outside air sucked from the intake port 6 is as described in FIG.

Next, FIG. 2B shows that only a part of the side surface of the recess 13 is cut so that a step C is formed on the side of the recess 13 provided around the bearing holding 12 on the side of the bearing holding 12. The intake port 6 is formed by lacking it. In this case, the intake port 6 is formed only on the side surface of the recessed portion 13, and the length of the bottom surface 14 of the recessed portion 13 that plays the role of the ventilation guide 10 is the same as that of the first portion in FIG. It is longer than that of the embodiment. Therefore, the outside air can be more easily sucked into the shaft 8 side. The flow of the outside air sucked from the intake port 6 is as described in FIG.

In the embodiment of the present invention shown in FIGS. 1, 2A and 2B, the bottom surface 1 of the recess 13 of the motor cover 5 is used.
Although 4 has a right angle with respect to the shaft 8, it does not have to be a right angle and may be any number as long as it is an angle at which outside air can be sucked into the shaft 8. Further, the bottom surface 14 may be a curved surface.

By the way, in the above embodiment, the intake port 6 is provided inside the outer diameter of the heat sink 3 of the rotor 1 and closer to the heat sink 3 than the end surface of the bearing holder 12 on the heat sink 3 side. It was Therefore, the electric motor cover 5 of the present invention has an external feature that the recess 13 is deeper by the thickness of the step C of the intake port 6 and the thickness of the bottom surface 14 than the conventional product.

[0017]

In the motor cover of the present invention, a part of the side surface of the hollow portion is cut out or a part of the side surface of the hollow portion is cut out on the bearing holding portion side of the hollow portion provided around the bearing holding portion for sucking outside air. ,
An intake port was formed by cutting out a part of the side surface and a part of the bottom surface, and the bottom surface of the cut-out recessed portion played a role of a ventilation guide. As a result, the outside air flowing into the hollow portion is sucked from the intake port toward the shaft side, that is, the central portion side of the electric motor, along the bottom surface of the hollow portion that functions as a ventilation guide. The outside air drawn in through the intake port flows into the space formed by the rotor heat sink and the shaft without stagnant air, cools the rotor heat sink and the stator heat sink sufficiently, and then exhausts them. Exhaust from the mouth to the outside of the electric motor. Therefore, the electric motor of the present invention can efficiently cool the inside of the electric motor without providing a separate cooling fan or ventilation guide.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view according to a first embodiment of the present invention.

FIG. 2A is an enlarged view of a cutout portion in FIG. 1, and FIG. 2B is a partially cutaway sectional view of a second embodiment of the present invention.

FIG. 3 is a partially cutaway sectional view of a conventional electric motor.

FIG. 4 is a partially cutaway sectional view of a conventional electric motor.

[Explanation of symbols]

1 rotor 2 stator 3 heat sink 4 Heat sink 5 motor cover 6 intake 7 exhaust port 8 shafts 9 Cooling fan 10 Ventilation guide 11 space 12 Bearing holder 13 hollow 14 Bottom 15 spaces M electric motor

Claims (2)

[Claims] 1. A part of the side surface of the recess is cut out, or a part of the side surface and a part of the bottom surface of the recess are formed on the bearing holding part side of the recess provided around the bearing holding part. An electric motor cover characterized in that an intake port is formed by cutting out. 2. An electric motor comprising the electric motor cover according to claim 1.