JPS6176043A - Winding machine - Google Patents

Abstract

PURPOSE:To cool a motor interior evenly, by a method wherein cooling air is introduced between a stator laminated core and a cover, and wherein the air is discharged in the axial direction from a hole formed on a core keep plate, and wherein the air is directed to a coil end by a guide. CONSTITUTION:Cooling air fed from a blower 15 is conducted to the primary ventilation flue 22 through a conducting duct 26 and a conducting hole 25, and when conducted, the air is divided into two in the direction evenly. And after a stator laminated core 1 is cooled b the air through the ventilation flue 22, and air is conducted to the secondary ventilation flue 24 from a continuous hole opposite to the conducting hole 25. The, the air is discharged from the secondary ventilation flue 24 evenly into a guide 29 via a discharging hole 28, and after a coil end 16 is cooled by the air, the air is discharged outside from the space between the coil end 16 and the guide 29. In this manner, the cooling air flows on the outer periphery of the stator laminated core 1 evenly in two directions, and so the uneveness of the temperature rise of the stator laminated core 1 can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hoisting machine applied to, for example, an elevator.

[Technical background of the invention and its problems]

Conventionally, gearless hoisting machines for elevators have used a direct current electric system, and those with particularly large capacity, such as those used in buildings with eight buildings, have low rotation speeds and frequent start-stops, so they are cooled without using self-fans. Generally, the forced communication III method is adopted.

However, DC motors require commutators, brush holders, etc., which not only prevents the hoist from being made smaller and lighter, but also makes it troublesome to replace the brushes and maintain the commutator. .

Therefore, recently, in order to solve the above-mentioned problem, a gearless hoisting rock using an AC motor has been studied.

Here, a gearless hoist using an AC motor will be explained based on FIGS. 6 and 7. Reference numeral 1 in FIG. 6 is a stator laminated core, which is fixed to the machine base 2 by being held between a pair of core holding plates 3.4 which also serve as legs. Further, bearing stands 5 and 6 are held at both ends of this machine stand 2, and a rotary shaft 9 is rotatably installed between these bearing stands 5 and 6 via bearings 7 and 8. In addition, this rotating shaft 9
, there is a wire loaf 11 on which the elevating body 10 is suspended.
A sheave 12 around which the motor is wound, and a rotor 13 of the electric motor are fitted. Thus, the rotational force of the electric motor is directly transmitted to the sheave 12 via the rotary shaft 9, whereby the elevating body 10 is moved up and down. Further, the rotation of the sheave 12 is stopped by a brake 14.

Reference numeral 15 denotes a blower, which is attached to an end cover 17 surrounding the coil end 16 with one end in close contact with the core presser foot 4 and the other end close to the sheave 12. The cooling air supplied from the blower 15 is
It passes through the gap A between the stator laminated core 1 and the rotor 13 from the end cover 17, and is discharged to the opposite side.
Coil 18 and rotor 13 are designed to be cooled.

However, in the case of an AC motor, the gap A is generally small, so the capacity of the blower 15 must be increased in order to increase the cooling effect, and even if the motor is made smaller, the air still cannot be blown.
115 becomes large, making it impossible to downsize the entire hoisting machine. In addition, since the cooling air is blown from the right to the left of the stator core 1 in FIG. 6, as shown in FIG. 7, the inlet side is well cooled, but as it approaches the outlet side, the coil
8 becomes high and cannot be cooled uniformly.

Therefore, in order to keep the temperature rise within a certain value, the feeder ff1 15 must be made larger than necessary, which increases the weight of the hoist and causes further noise.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide a hoisting machine that can uniformly cool the inside of an electric motor and can be made smaller and lighter.

[Summary of the invention]

In order to achieve the above object, the present invention provides a hoisting machine having a structure in which a stator laminated core of an AC motor is held between a pair of core holding plates fixed on an Akebono stand, in which cold 1&l supplied from a blower is transferred to the stator. Cooling air is introduced between the laminated core and a cover placed around it with a predetermined gap, and the introduced cooling air is discharged in the axial direction from a hole formed in the core holding plate. It is characterized by a structure in which the wind is guided toward the coil end by a guide.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. In FIGS. 1 and 2, a cylindrical first cover 21 is installed around the entire outer circumference of the stator laminated core 1 between core holding plates 3 and 4 that clamp and fix the stator laminated core 1 to the machine stand 2. with a predetermined gap and both ends thereof are connected to the core holding plates 3.4, and together with the stator laminated core 1 and the core holding plates 3, 4, the first ventilation passage 22 is formed. In addition, the above iron core holding plate 3.
A cylindrical second cover 23 is disposed between the first cover 21 and the first cover 21 so as to cover the entire outer periphery of the first cover 21 with a predetermined gap and connect both ends to the core holding plates 3 and 4. The first cover 21 and the core holding plates 3, 4 are
Together, they form a second ventilation path 24. Further, an introduction hole 25 for introducing cooling air into the first ventilation passage 22 is formed in the first cover 21, and the other end of an introduction duct 26 whose one end is connected to the air blower 115 is formed in the introduction hole 25. It penetrates the second cover 23 and the second ventilation passage 24 and is connected to the second ventilation passage 24 in a state where it does not communicate with the second ventilation passage 24 . Further, on the opposite side of the introduction hole 25 with respect to the axis of the first cover 21, a φ communication hole 27 is formed to communicate the first ventilation passage 22 and the second ventilation passage 24. Further, in the core holding plate 3゜4, a plurality of exhaust holes 28 for discharging cooling air from the second ventilation passage 24 are provided in the gap between the first cover 21 and the second cover 23, that is, the second ventilation It is formed along the path 24. Furthermore, the cooling air discharged from the discharge holes 28 . . . to the coil ends 16 .
A guide 29.29 guiding towards the coil end 16.16 is fixed and is of cylindrical design, covering the coil end 16.16 in a bag-like manner with a gap.

Therefore, the cooling air supplied from Jiltm15 is
The air is introduced into the first ventilation path 22 through the introduction duct 26 and the introduction hole 25, and is divided equally into two directions upon introduction. Then, after cooling the stator laminated core 1 through the first ventilation passage 22 , it is introduced into the second ventilation passage 24 through the communication hole 27 on the opposite side to the introduction hole 25 . Then, the second
guide 29 from the ventilation passage 24 through the discharge hole 28...
, 29, and after cooling the coil end 16.16, the coil end 16.16 and the guide 29, 2
It is discharged to the outside through the gap with 9.

According to such a configuration, the cooling air flows evenly around the outer periphery of the stator laminated core 1 from two directions, so that variations in the temperature rise of the stator laminated core 1 can be reduced. Moreover, since the cold ms that cooled the stator laminated core 1 is blown evenly to both coil ends 16.16, the difference in temperature rise between both coil ends 16.16 can be reduced.

Therefore, as shown in FIG. 3, the temperature rise distribution of the coil 18 can be made uniform.

Note that the present invention is not limited to the above-mentioned embodiment, and may be configured as shown in FIGS. 4 and 5, for example. That is, between the core holding plates 3 and 4 that clamp the stator laminated core 1 and fix it to the machine stand 2, a cylindrical cover 31 covers the entire outer periphery of the stator laminated core 1 with a predetermined gap. The stator laminated iron core 1 and the core holding plate 3.4 are arranged such that both ends thereof are connected to the core holding plate 3.4.
Together with 4, it forms a service path 32. Further, an introduction hole 25 for introducing cooling air into the ventilation passage 32 is formed in the cover 31, and the other end of an introduction duct 26 whose one end is connected to the blower 15 is connected to the introduction hole 25. Further, a plurality of discharge holes 28 for discharging cooling air from the ventilation passage 32 are formed in the core holding plate 1 along the gap between the cover 31 and the stator fi layer core 1. However, the blower 15
The cooling air supplied from the stator laminated core 1 is introduced into the ventilation passage 32 through the introduction duct 26 and the introduction hole 25, and is equally divided into two directions to evenly cool the outer periphery of the stator laminated core 1. Then,
The guide 29. from the ventilation passage 32 via the discharge hole 28.
29 and uniformly cools the coil ends 16°16. According to such a configuration, since the ventilation path for cooling the stator laminated core 1 and the ventilation path for exhausting air toward the coil ends 16.16 are not separated, the cooling efficiency is lower than that of the above embodiment, but 1111 covers can be saved.

〔Effect of the invention〕

As explained above, according to the present invention, the cooling air supplied from the blower is introduced between the stator laminated core and the cover disposed around the stator laminated core with a predetermined gap, and the introduced cooling air is is discharged in the axial direction from the hole formed in the core holding plate.
Since the discharged cooling air is guided toward the coil end by a guide, it is possible to equalize the temperature rise inside the electric motor and increase the cooling efficiency.

Therefore, there is no need to increase the capacity of the blower more than necessary, so forced heat circulation can be achieved without increasing weight or noise.Also, by taking advantage of the characteristics of an AC motor, a significant weight reduction can be achieved. It has excellent effects such as being able to

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is the relationship between the coil position and coil temperature in the same embodiment. FIG. 4 is a partially cutaway side view of another embodiment of the present invention, and FIG.
FIG. 6 is a cross-sectional view of the same embodiment, FIG. 6 is a partially cutaway side view of the conventional example, and FIG. 7 is a diagram showing the relationship between the coil position and coil temperature in the conventional example. 1... Stator laminated core, 2... Machine base, 3, 4...
Iron core holding plate, 15... Feed 1 [16... Coil end, 21... First cover, 22... First ventilation path,
23...Second cover, 24...Second ventilation path, 2
5...Introduction hole, 26...Introduction duct, 27...Communication hole, 28...Discharge hole, 2...Guide, 31...
・Cover, 32...Ventilation passage. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) In a hoisting machine having a structure in which the stator laminated core of an AC motor is sandwiched between a pair of core holding plates fixed on the machine base, the outer periphery of the stator laminated core is covered with a predetermined gap between both ends. a cover that forms a ventilation passage by connecting an edge to the core holding plate; an introduction hole formed in the cover for introducing cooling air into the ventilation passage; and a cover that connects the ventilation passage to the ventilation passage through the introduction hole. A blower for supplying cooling air, a discharge hole formed in the iron core holding plate to discharge cooling air from the ventilation passage, and a guide for guiding the cooling air discharged from the discharge hole toward the coil end. A hoist that is characterized by: (2) The cover includes a first cover that covers the outer periphery of the stator laminated core with a predetermined gap and connects both edges to the core holding plate to form a first passage path; a second cover that covers the outer periphery of the first cover with a predetermined gap and connects both edges to the core holding plate to form a second ventilation passage; , an introduction hole for introducing cooling air into the first ventilation passage, and a communication hole formed at a position opposite to the introduction hole and allowing communication between the first ventilation passage and the second ventilation passage; 2nd above
and an introduction duct that penetrates the ventilation passage and introduces cooling air from the blower into the first ventilation passage through the introduction hole, and the discharge hole discharges the cooling air from the second ventilation passage. A hoisting machine according to claim 1, characterized in that the hoisting machine is configured to: