JP2560044Y2 - Rotary electric machine with mounting feet - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine with mounting feet. FIG. 6 is a front view showing a partial cross section of a conventional motor with mounting feet, FIG. 7 is a perspective view showing the flow of cooling air of the motor with mounting feet in FIG. 6, and FIG. () Is a side view showing a conventional motor with mounting feet, and (b) is a front view thereof. In the drawing, reference numeral 1 denotes a frame of the electric motor,
Reference numeral 2 denotes a load-side bracket that closes an opening on the output shaft side of the frame 1, and reference numeral 3 denotes a non-load-side bracket that closes an opening on the anti-output shaft side of the frame 1. Is protected. Numeral 4 denotes a stator core of the electric motor, numeral 5 denotes a rotor core disposed on the inner peripheral portion of the stator core 4 with a predetermined gap therebetween, and numeral 6 denotes a load-side bracket 2 to which the rotor core 5 is fixed and an anti-load side. A rotating shaft 7 supported by the bracket 3 is a rotor formed by the rotor core 5 and the rotating shaft 6. 8 is a cooling fan mounted on the anti-load side of the rotating shaft 6 and outside the anti-load side bracket 3;
A cover 9 covers the cooling fan 8, and the cover 9 has a wind window 9a and an opening end 9b. Reference numeral 10 denotes a mounting foot fixed to the frame 1, and is integrally formed by drawing or the like such as press working. Conventional motors have been configured as described above. Here, the operation of this conventional motor will be described. When the coil wound around the stator core 4 is energized, the rotor 7 starts rotating, and at the same time, the cooling fan 8 mounted on the rotating shaft 6 of the rotor 7 also rotates. By the rotation of the cooling fan 8, the air sucked through the wind window 9a of the cover 9 is blown out from the opening end 9b along the outer surface of the frame 1 (see the arrow in FIG. 6). This gas flow acts as cooling air to cool the motor, preventing overheating of the motor. Next, the flow state of the cooling air and the range of cooling by the cooling air will be described with reference to FIGS. As shown in FIG. 7, if the rotation direction of the rotating shaft 6 of the electric motor and the cooling fan 8 is indicated by an arrow A as shown in FIG. 7, the cooling air is twisted along the outer surface of the frame 1 as indicated by an arrow B. It flows while presenting. As shown in FIG. 8, the cooling air only cools the outer surface of the frame 1 in the range indicated by the arrow C almost uniformly, and the bottom of the mounting foot 10 has a frame. The heat transmitted from No. 1 is in a muffled state. In the conventional rotary electric machine with mounting feet as described above, the portion to which the mounting feet 10 are fixed is the outer surface of the bottom of the frame 1, so that heat is generated. The radiation effect is poor, and the cooling effect of this part is not very good. The part of the mounting foot 10 protruding on both sides of the frame 1 when viewed from the axis side only increases the cooling area, and the mounting foot 10 The role of the heat radiation fin was small. Usually, the mounting foot 10 of the rotating electric machine with the mounting foot is used.
Is often located near the center of the stator core inserted into the frame 1, and most of the components that become heat sources during operation of the rotating electric machine with mounting feet are often provided. In particular, there is a problem that the cooling effect is reduced. Therefore, in the rotary electric machine with the mounting feet provided with the mounting feet 10 of this type, when a high-efficiency cooling design is inevitably required, there is a problem that the cost is increased. Was. In addition, since the mounting foot 10 is manufactured by drawing by press working, the mold is complicated and expensive, and a large press having high pressurizing ability is required, which increases the capital investment cost. There was a point. Therefore, the present invention has been made to solve such a problem, and can improve the cooling performance, can be formed by a simple punching process and a bending process, and can attach a frame to a mounting portion. It is an object of the present invention to provide a rotary electric machine with mounting feet having mounting feet with good operability of a mounting tool when mounting on a motor. A rotary electric machine with mounting feet according to the present invention has a cylindrical frame that covers the outer periphery of a stator core, and a mounting foot provided with the mounting feet mounted on the frame. In the rotating electric machine, the mounting foot is provided on a plate-shaped fixed plate portion.
A fixing plate having a mounting hole, and opposing sides of the fixing plate
A pair of plate-like projections erected in the same direction.
Portion, the end opposite to the fixed plate portion side of the plate-shaped protrusion,
Outer peripheral surface of the frame along the longitudinal direction of the frame
And the front of the frame near the bottom.
A ventilation path is provided in the plate-like projection . In this invention, the mounting foot is a plate-shaped fixing plate.
Plate having a mounting hole in the part, and opposing this plate
A pair of plate-like members erected so that they are in the same direction
And an end opposite to the fixed plate portion side of the plate-shaped protrusion.
Outside the frame along the longitudinal direction of the frame.
Affixed to the peripheral surface and near the bottom of the frame
Since the ventilation path is provided in the plate-shaped projection, cooling air flows from the ventilation path to the bottom of the rotating electric machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. FIG. 1 is a front view showing a partial cross section of a motor with mounting feet showing an embodiment of the present invention, FIG. 2 is a perspective view showing the flow of cooling air of the motor of FIG. 1, and FIG. FIG. 5B is a perspective view showing the mounting feet used in the example, FIG. 4B is an exploded view, FIG. 4 is a perspective view of the essential parts showing the flow of cooling air near the mounting feet used in the embodiment of the present invention, and FIG. Is a side view showing a state in which the mounting feet used in the embodiment of the present invention are mounted on the frame.
(b) is a front view of the same. In the figure, 1 to 1
Numeral 0 is the same or equivalent to the above-mentioned conventional example. In the drawing, reference numeral 11 denotes a mounting foot, which is formed by cutting a flat plate such as a steel plate and bending it. Two mounting feet 11 are fixed to the outer surface of the frame 1 at symmetrical positions as viewed from the axial direction of the rotating shaft 6. With respect to the electric motor configured as described above,
The operation itself, in particular, the operation of generating the cooling air and the like is the same as that of the conventional electric motor, and the description thereof is omitted here. Therefore, the shape and performance of the mounting foot used in the embodiment of the present invention will be described, and, particularly, the improved portion of the flow state of the cooling air and the coolable range by the cooling air will be described. First, the shape of the mounting foot 11 is shown in FIG.
Will be described. When the mounting foot 11 is fixed to the frame 1 when viewed from the axial direction of the rotary shaft 6, the mounting foot 11 has a substantially U-shape, that is, a three-folded shape having both ends opened. For this reason, the joint with the frame 1 is fixed by welding or the like at three locations of the projection 11b as the other plate-shaped projection and the projection 11c and the projection 11d as the one plate-shaped projection of the mounting foot 11. can do. The convex portion 11c and the convex portion 11d are formed on the same surface, and the notch portion 11a is formed at an intermediate portion thereof, so that the notch portion 11a can be skipped during welding. In addition, the convex portion 11c and the convex portion 1
1d and the convex portion 11b are attached to a mounting plate portion 11e as a fixed plate portion.
Are formed through the surface. Furthermore, the mounting plate 1
1e, an attachment hole 11f as an insertion hole for a bolt or the like is formed in order to fix the motor to the attached portion, and the width of the protrusion 11b is set to be equal to or less than the interval between the insertion holes of the attachment hole 11f. The operability is considered so that the rotation angle of the tool for tightening bolts and the like can be increased. A development view of the mounting foot 11 is shown in FIG.
As shown in (b), it has a substantially Y shape, and depending on how it is viewed, a substantially concave shape and a convex shape are added in opposite directions, and the fold curves 11g and 11h are both valley-folded. The mounting foot (11) can be formed by performing the same bending process of the mountain fold. Next, the ventilation performance of the mounting feet 11 for cooling air will be described. The cooling air flowing in the vicinity of the mounting foot 11 is, as shown by a white arrow D in FIG.
1c and the notch 11a formed by the protrusion 11d and the protrusion 1
1b, the convex portions 11c and the convex portions 11d
And a convex portion 11b, and a space portion parallel to the axial direction of the rotating shaft 6 flows as a ventilation path. In addition, the cooling wind that advances in a twisted state due to the rotation of the cooling fan 8 has a substantially U-shaped end portion of the mounting foot 11 fixed to the frame 1 when viewed in the axial direction of the rotating shaft 6. A cut-out portion 11a serving as a ventilation passage in the circumferential direction of the frame 1 is formed on a surface parallel to the axial direction of the rotating shaft 6. Notch 1 from inside
1a. Conversely, the cooling air that rotates in the circumferential direction of the frame 1 can also flow to the inside of both mounting feet 11 through the notch 11a. Therefore, the flow state of the cooling air and the cooling range by the cooling air are as follows:
It extends to the bottom of the frame 1 to form the entire outer surface of the frame 1. That is, conventionally, the cooling air generated by the cooling fan 8 does not have a notch by drawing such as press working, and furthermore, a flat plate is fixed to the frame 1 in a specific shape, and the circumferential direction of the frame 1 is In the vicinity of the mounting foot 10 which is manufactured so as to block the cooling air, the outer surface of the frame 1 did not reach directly. However, according to the electric motor with mounting feet of this embodiment, the cooling air also flows on the outer surface of the frame 1 at the fixing portion of the mounting feet 11 (see FIG. 2,
The cooling range by the cooling air is indicated by the arrow E in FIG. 5 (a).
To the range. By increasing the cooling area by such cooling air, the cooling performance of the electric motor can be improved. Further, even when there is no cooling air indicated by the white arrow D shown in FIG. 4, heat is not trapped at the bottom of the mounting foot 10, and heat is generated at the bottom of the frame 1 as shown in FIG. Notch 11a due to natural convection with heated air
It is radiated through. In the above description, the mounting feet 11
Is formed in a substantially Y-shape, the frame 1 and the fixing are in a three-point support state, and the stability of the motor body at the time of fixing is improved, and the notch is provided at the middle between the protrusions 11c and 11d. Since the notch 11a is formed, the notch 11a can be skipped during welding and welding can be shortened, and the welding portion can be reduced. Further, the deformation of the frame 1 due to welding heat can be prevented by reducing the number of welding points. Further, according to the mounting foot 11, the welded portion, which is a fixed portion to the frame 1, can be located higher than the bottom of the electric motor as compared with the conventional drawing-shaped mounting foot 10. In addition, the strength can be increased with respect to an external force acting on the rotating shaft 6 of the electric motor. In the above-described embodiment, the deployment shape of the attachment foot 11 has been described as being substantially Y-shaped, but is not necessarily limited to this shape. For example, the shape may be substantially H-shaped or substantially Z-shaped. However, the deployed shape of the mounting feet 11 needs to take into consideration the flow of the cooling air, the fixing strength of the electric motor, and the like. Also,
Mounting feet are formed by stamping and bending press
Enables processing with inexpensive dies and small presses
It works. Further, in the above-described embodiment, almost the center of the plate-shaped protrusion is provided.
A notch is provided at the center, so when welding to the frame
Welding can be skipped, reducing welding tact time.
At the same time, the number of welding points is reduced,
Thermal deformation of the frame can be prevented. As described above, in the rotary electric machine with mounting feet according to the present invention, the mounting feet are provided with the mounting holes in the plate-shaped fixing plate.
And a fixing plate having the same
Having a pair of plate-shaped protrusions erected to be in the direction,
The opposite end of the plate-shaped projection from the fixed plate portion side is
When fixed to the outer peripheral surface of the frame along the longitudinal direction of
Both the plate-shaped protrusions on the side near the bottom of the frame
In addition, a ventilation passage is provided,
Cooling air circulates from the ventilation path to the bottom of
And a pair of plate-like projections serve as radiation fins.
The cooling effect of the converter is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a partial cross section of a motor with mounting feet according to an embodiment of the present invention. FIG. 2 is a perspective view showing a flow of cooling air of the electric motor with mounting feet of FIG. 1; FIG. 3 is a structural view of a mounting foot used in an embodiment of the present invention. FIG. 4 is a perspective view of a main part showing a flow of cooling air near a mounting foot used in the embodiment of the present invention. FIG. 5 is an explanatory view showing a state in which a mounting foot used in one embodiment of the present invention is mounted on a frame. FIG. 6 is a front view showing a partial cross section of a conventional electric motor with mounting feet. FIG. 7 is a perspective view showing a flow of cooling air of the electric motor of FIG. 6; FIG. 8 is a structural view showing a conventional motor with mounting feet. [Description of Signs] 1 Frame 2 Load side bracket 3 Non-load side bracket 4 Stator core 5 Stator core 6 Rotating shaft 7 Rotor 8 Cooling fan 9 Cover 9a Wind window 9b Open end 11 Mounting foot 11a Notch

Claims (1)

(57) [Rules for requesting registration of utility model] In a rotary electric machine with a mounting foot provided with a cylindrical frame that covers the outer periphery of a stator core and mounting feet mounted on the frame, the mounting foot has a mounting hole in a plate-shaped fixing plate.
To the fixed plate and the opposite side of the fixed plate
And a pair of plate-shaped protrusions erected so as to face each other.
The end opposite to the fixed plate portion side of the plate-shaped protrusion is
When fixed to the outer peripheral surface of the frame along the longitudinal direction
In addition, in the plate-shaped protrusion on the side near the bottom of the frame,
A rotating electric machine with mounting feet, wherein a ventilation path is provided .