JPH0746796A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor which can be manufactured at lower cost by using the same housing for a totally-enclosed type and an opened type. CONSTITUTION:A radiation fin 12 installed on an outer face of a housing 11 has sections 12a, 12b, each of which is extended in the axis direction from a faucet fitting section E on each end of the housing 11. On the outer faces of the extended sections 12a, 12b, cylinder-shaped members 13A, 13B are installed respectively. Due to this structure, the same housing 11 can be used for a totally-enclosed type motor and an opened type motor and thereby the number of components can be reduced. At the same time, the number of the housings 11 can be increased. As a result, lower cost motors can be provided easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-ventilation cooling type electric motor, and more particularly to a self-ventilation cooling type electric motor suitable for a relatively small capacity general-purpose induction motor.

[0002]

2. Description of the Related Art Motors such as general-purpose induction motors are usually of the self-ventilated cooling type except for those of extremely small capacity. There is a mold. FIG. 4 shows an example of a full-closed general-purpose induction motor that has been conventionally used. In the figure, reference numeral 1 is a housing, which is also called a frame or frame, and is made into a substantially cylindrical shape by casting cast iron or aluminum alloy. And constitutes the outer casing of the electric motor.

2A and 2B are end brackets which are attached to both ends of the housing 1 by spigot fitting. A stator (stator) 3 includes a stator core made of a laminated body of silicon steel plates, and a stator coil wound around a plurality of slots provided on the inner circumference of the stator core. It is composed of.

Reference numeral 5 is a rotary shaft (shaft), 6 is a rotor (rotor), and bearings 4A, 4B of the end brackets 2A, 2B.
Thus, the rotary shaft 5 is rotatably held, and the rotor 6 positioned inside the stator 3 is thereby rotated. In addition, E represents a spigot fitting portion, and G represents a gap between the stator 3 and the rotor 6.

Then, in such an electric motor, as shown in FIG. 5, the stator 3 is previously inserted and attached inside the housing 1, and then the rotor 6 is inserted into the stator 3, The bearings 4A and 4B are fitted to the rotary shaft 5, and the end brackets 2 are attached to both ends of the housing 1, respectively.
A and 2B are fitted in a spigot, and fixedly attached to the housing 1 by a plurality of bolts 7.

The rotary shaft 5 has one end side (right side in the drawing) inserted through the bearing 4B of the end bracket 2B and protrudes to the outside to form an output shaft, while the other end side (left side) of the rotary shaft 5 is the end bracket 2A. A cooling fan 9 is attached to a portion projecting from the bearing 4 </ b> A and is covered with an end cover 10.

Therefore, in this fully-closed induction motor, the inside of the housing 1 is hermetically sealed by the end brackets 2A and 2B, and the cooling is performed by the end cover 10.
The outside air sucked in by the cooling fan 9 from the ventilation inlet is sent to the end bracket 2A and the outer surfaces of the housing 1 and the end bracket 2B,
You can get it.

On the other hand, in the open type induction motor, although not shown in FIG. 4, there are a plurality of outside air intake ports on the end surfaces of the end brackets 2A and 2B, and a plurality of air holes on the circumferential surface of the housing. Outside air discharge holes are provided at both ends, and both ends of the rotor 6 have a cooling fan 6 formed of a plurality of blade blades axially protruding from the faces.
a and 6b are provided.

The cooling fans 6a and 6b vent the air to provide a cooling action. Therefore, the cooling fan 9 and the end cover 10 are not provided.

As described above, since the fully closed type electric motor and the open type electric motor have different air flow paths, the shape of the end bracket is, of course, the shape of the end bracket, even when the size of the stator and the size of the rotor are the same. The shape of the housing is also very different. Therefore, conventionally, these housings, etc.
Different ones were used according to the ventilation system of the electric motor.

[0011]

In the above-mentioned prior art, consideration is not sufficiently given to the sharing of parts between electric motors having different ventilation systems, and a housing having a different shape between the fully closed type and the open type. Therefore, there is a problem that the cost is likely to increase.

An object of the present invention is to provide an electric motor in which the housing can be shared between the fully closed type and the open type, and the cost can be sufficiently reduced.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radiation fin on an outer peripheral surface of a housing having a portion axially extended from spigot fitting portions at both ends of the housing, and an outer peripheral portion of the extended portion. This is achieved by providing a tubular member in the.

[0014]

The portions of the radiating fins that extend axially from the spigot fitting portions at both ends of the housing are located outside the outer peripheral portion of the bracket, and the outer peripheral portions are covered with a tubular member. Therefore, in either the fully closed type or the open type ventilation system, the cooling air passage can be formed by simply changing the shape of the bracket, and the housing can be shared.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electric motor according to the present invention will be described in detail below with reference to the illustrated embodiments. FIG. 2 shows an embodiment in which the present invention is applied to a general-purpose full-closed induction motor. In this drawing, 11 is a housing, 12 is a radiating fin, and 12
a and 12b are extension parts of the radiation fin, and 13A and 1A.
3B is a tubular member, and the others are the same as those of the conventional example described in FIGS. 4 and 5.

The housing 11 in this embodiment is made of an aluminum alloy material having a high thermal conductivity and is manufactured by die-casting with a high productivity. At this time, the radiation fin 12 and its extended portions 12a, 12b, and the cylinder are formed. The members 13A and 13B are integrally formed.

FIG. 1 is a detailed explanatory view of the housing 11,
As is apparent from FIG. 1, the housing 11 is
At both ends thereof, a substantially cylindrical portion 11a in which a spigot portion E into which the end brackets 2A and 2B are fitted is formed is formed as a main portion, and a plurality of heat radiation fins 12 are formed radially on the outer peripheral surface thereof. It has been formed.

The radiating fins 12 have extension portions 12a and 12b extending axially further from spigot portions E at both ends of the cylindrical portion 11a. The extension portions 12a and 12b have outer peripheral portions. Cylindrical members 13a, 13b
Are provided respectively.

Then, the housing 1 in this embodiment
As described above, 1 is made as a unitary member including the radiation fin 12 and its extended portions 12a and 12b, and the tubular members 13A and 13B by die casting, and is then preliminarily provided at both ends of the cylindrical portion 11a. The spigot part E is supplied in a processed state.

Therefore, in the embodiment of FIG. 2, the housing 11 is used, and the end brackets 2A and 2B are fitted to the housing 11 by the spigot portion E, and the housing 11 is assembled in the same manner as in the conventional example of FIG. It will be. Returning to the explanation of FIG.
In this embodiment, the outer end of the tubular member 13a of the housing 11 is connected to the cylindrical portion of the end cover 10, and the outer end of the tubular member 13b is
A cooling air guide 14 made of a shallow plate-like member having no bottom is provided. The end bracket 2B is provided with a rib 15 which also serves as a heat radiation fin.

Next, the cooling operation in the embodiment of FIG. 2 will be described. When the cooling fan 9 is rotationally driven by the rotor 6, the blowing action thereof causes a flow of air as shown by the arrow in the figure, and as a result, a sufficient cooling effect can be obtained.

That is, when the cooling fan 9 is driven to rotate, the outside air is first sucked into the inside from the outside of the end cover 10 by the centrifugal fan function, as shown by the arrow A, and this is indicated by the arrow B by the cooling fan 9. It is sent out as shown. Then, by the guide action of the tubular member 13A, as shown by the arrow C, the straight member goes straight between the extended portions 12a of the radiating fins 12 and, as it is, as shown by the arrow D,
The extended portion 12b on the opposite side passing through between the radiation fins 12
And the tubular member 13B, and is guided to the cooling air guide 14 by the guide action of the tubular member 13B, and is guided to the surface of the end bracket 2B by the cooling air guide 14 as shown by the arrow E. The heat is taken away from the rib 15.

Therefore, according to this embodiment, the cooling air is less likely to diffuse in the middle, so that the cooling air can surely flow along the space between the heat radiating fins 12 and also along the surface of the end bracket 2B. Since it is made to flow, sufficient heat dissipation can be obtained by the heat dissipation fins 12, and the bearing 4B
Is effectively cooled, and as a result, the temperature rise can be sufficiently suppressed and the life of the bearing can be extended.

In the embodiment of FIG. 2, the rotor 6 is also used.
At both end surfaces of the housing, cooling fans 6a, 6b composed of a plurality of blade blades projecting from this surface in the axial direction are provided. Therefore, during operation, the cooling fans 6a, 6b serve to cool the air inside the housing 11. Since this is agitated, it has the effect of making the internal temperature uniform and the effect of promoting heat transfer to the housing 11 and the end brackets 2A, 2B.

Next, another embodiment of the present invention will be described. FIG. 3 shows an embodiment in which the present invention is applied to a general-purpose open type induction motor. In this drawing, 21A and 21B are shown.
Is an end bracket, and the others are the same as the embodiment of FIG.

These end brackets 21A and 21B
In each of the cylindrical portions, a plurality of outlet side ventilation holes 22a, 22b arranged in order along the circumferential direction, a plurality of inlet side ventilation holes 23a, 23b arranged in the end face portion, and external cooling air are provided. Guide portions 24a and 24b and internal cooling air guide portions 25a and 25b are provided therein.

The outlet-side ventilation holes 22a and 22b are provided inside the housing 11 by extending the radiating fins 12a and 1b.
2b and the cylindrical members 13a, 13b are provided to communicate with each other, but here, as shown in the figure, these outlet side ventilation holes 22a, 22b are fitted to the end brackets 2 respectively.
The reason why the portions projecting from the cylindrical portions 1A and 21B are provided is for drip-proofing. In other words, water droplets may enter between the radiating fins 12 from the upper side of the drawing. At this time, if the water droplets flow into the housing 11 through the outlet side ventilation holes 22a and 22b, the drip-proof property is lost. This protruding portion is provided to prevent the inflow of water.

Also in the embodiment of FIG. 3, similarly to the embodiment of FIG. 2, the housing 11 whose details are shown in FIG. 1 is used, and the end brackets 21A and 21B are attached to the housing 11 by the spigot fitting portion E. They are fitted together and assembled in the same manner as the conventional example of FIG.

Next, the cooling action in the embodiment of FIG. 3 will be described. On both end surfaces of the rotor 6, cooling fans 6a, 6b composed of a plurality of blade blades are provided,
Therefore, when the rotor 6 rotates, these cooling fans 6
The centrifugal fan action by a and 6b works.

As a result, first, the inlet side ventilation holes 23a, 2
3b, the outside air is sucked in as shown by the arrow a, and this is guided by the internal cooling air guide portions 25a, 25b, and as shown by the arrow b, the cooling fans 6a, 6b.
Be guided inside. Then, the cooling fans 6a and 6b
The air guided to the inside of the fan is given a centrifugal force by the rotation of the cooling fans 6a and 6b, flows to the outside as shown by the arrow C, advances along the surface of the stator coil, and then a plurality of outlet side ventilation It flows from the holes 22a and 22b between the extended portions 12a and 12b of the heat radiation fin 12 and the tubular members 13a and 13b.

At this time, the respective end portions of the tubular members 13a and 13b are closed by the external cooling air guide portions 24a and 24b provided on the end brackets 21A and 21B. Therefore, the air flowing between the extended portions 12a and 12b and the tubular members 13a and 13b flows toward the central portion along the space between the radiating fins 12 as indicated by the arrow D, and the arrow indicates at the central portion. As shown in e,
It diffuses in the air.

Therefore, according to the embodiment shown in FIG. 3, since the air flow by the cooling fans 6a and 6b is always in a state of being sufficiently in contact with the radiation fin 12, the radiation fin 1
The heat transfer from 2 is improved and effective cooling can be obtained.

By the way, referring to the embodiments shown in FIGS. 2 and 3, both of them use the housing 11 shown in detail in FIG. 1, and therefore, as will be apparent from this, according to the present invention. For example, it can be understood that both the fully closed type and the open type induction motors can be configured by sharing the same shaped housing.

Therefore, according to this embodiment, the housing can be shared by the fully closed induction motor and the open induction motor, and the cost can be sufficiently reduced. That is, in general, for a component such as a housing, as is known as a mass production effect, the unit price can be reduced as the number of manufactured identical components increases.

In particular, the housing 1 shown in the embodiment of FIG.
As described above, 1 is generally produced by die casting of an aluminum alloy material or the like. However, in a product produced by such die casting, the cost reduction effect due to an increase in the number of products produced is significant, and As in the embodiment of the present invention, if the housing can be shared between the fully closed induction motor and the open induction motor, the number of manufactured housings having the same shape and the same size can be increased. Therefore, a sufficient cost reduction can be obtained.

[0036]

According to the present invention, since the same housing can be shared by the fully closed type electric motor and the open type electric motor, the number of parts can be reduced and the same housing can be used. Since it is possible to increase the number of manufactured electric motors, it is possible to easily provide a low-cost electric motor.

[Brief description of drawings]

FIG. 1 is a side view with a partial cross section showing an example of a housing in an embodiment of an electric motor according to the present invention.

FIG. 2 is a partial cross-sectional side view showing an embodiment of an electric motor according to the present invention.

FIG. 3 is a side view with a partial cross section showing another embodiment of the electric motor according to the present invention.

FIG. 4 is a side view with a partial cross section showing an example of a conventional induction motor.

FIG. 5 is an assembly explanatory diagram of a conventional induction motor.

[Explanation of symbols]

 2A, 2B End bracket 3 Stator 4A, 4B Bearing 5 Rotating shaft 6 Rotor 6a, 6b Cooling fan 9 Cooling fan 10 End cover 11 Housing 12 Radiating fins 12A, 12B Radiating fin extension 13A, 13B Cylindrical member 14 Cooling Wind guide 15 Ribs 21A, 21B End brackets 22a, 22b Outlet side ventilation holes 23a, 23b Inlet side ventilation holes 24a, 24b External cooling air guide parts 25a, 25b Internal cooling air guide part E Inlay fitting part

Claims (3)

[Claims] 1. A motor in which end brackets are assembled by spigot fitting to both ends of a substantially cylindrical housing having radiating fins on an outer peripheral surface, wherein the radiating fins are connected to the shaft from the spigot fitting portions at both ends of the housing. An electric motor having a portion extended in a direction, and a cylindrical member provided on an outer peripheral portion of the extended portion. 2. The invention according to claim 1, wherein the end bracket comprises a substantially disk-shaped end surface portion and a substantially cylindrical cylindrical portion formed around the end surface portion, and the end portion of the cylindrical portion An electric motor, which is configured to be fitted to the spigot portion of the housing. 3. The electric motor according to claim 1, wherein a cooling air suction port is formed in the end face portion of the end bracket, and a cooling air discharge port is formed in the cylindrical portion.