JPH09252562A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stable performance of a motor by securing the quantity of air to the inside of a rotor while making the most of the heat exchanging function by a fin for heat radiation, and reinforcing the cooling function of the rotor. SOLUTION: In a motor where a shaft 2, a rotor 3 attached in a body with the shaft, surrounding this shaft 2, and a stator 4, which surrounds this rotor 3, are provided in the space within the frame 1, and a cooling fluid path 6 is made between the shaft 2 and the rotor 3, and also a cooling fin 10 is made at the end face of the rotor, and a fan 5, which circulates the fluid within the space to the cooling fluid path, is attached to the shaft, a fin and a tubular barrier plate 13 to demarcate the cooling fluid path are provided at the entrance of the cooling fluid path.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a motor structure having an improved cooling method.

[0002]

2. Description of the Related Art Due to the structure of a motor, heat generated by a stator core and a coil which are fixed outside is easily dissipated to the outside. However, the rotor core, which is a rotating body, is supported by bearings in air having poor heat conductivity in the frame. For this reason, even when cooling water is present on the outer periphery of the frame as in an underwater motor, the heat generated in the rotor is difficult to escape to the outside, which has been a factor that hinders downsizing of the motor.

As a motor for efficiently radiating heat of the motor rotor to the outside, there is a motor as shown in FIG. This is because the shaft 2 is provided in the space inside the cylindrical frame 1.
A rotor 3 surrounding the shaft body and integrally attached to the shaft body, and a stator 4 surrounding the rotor 3, wherein the shaft body 2 circulates a gas sealed in a space. 5 are integrally mounted. In addition, a rotor ventilation passage 6 is formed between the shaft body 2 and the rotor 3, a ridge 7 extending in the axial direction is formed on the frame 1, and a frame ventilation passage 8 is formed inside the ridge 7.
Further, plate-like fins 10 protruding outward are formed on an end ring 9 constituting an end face of the rotor 3, thereby increasing an area for heat exchange between the rotor 3 and flowing gas to cool the rotor 3. Improving efficiency.

In this motor, the cooling air discharged in the outer peripheral direction by the fan 5 along with the rotation of the rotor 3 is guided to the frame ventilation passage 8 where it is cooled by the cooling water on the outside of the frame 1. It is introduced into the lower core chamber 11 while descending as shown by the arrow 5.
The cooled air is further sucked by the fan 5 to
It is guided to a rotor ventilation passage 6 formed between the main shaft 2 and the rotor core 3, where it rises as indicated by an arrow while taking heat generated in the rotor core 3, reaches the upper core chamber 12, and receives a fan. Return to suction port 5.

[0005]

In the conventional motor as described above, as shown in FIG. 6, the gas introduced from the lower core chamber 11 to the rotor air passage 6 by the suction of the fan 5 is the rotor air passage. The heat dissipation fins 10 of the rotor core 3 provided near the inlet of the rotor 6 bend the outer circumference. Therefore, the amount of the rotor cooling air guided to the rotor ventilation passage 6 is insufficient, and the rotor core 3 is not sufficiently cooled, so that the temperature may rise more than expected.

According to the present invention, the amount of air blown to the inside of the rotor is secured while utilizing the heat exchange function of the radiating fins.
It is an object of the present invention to enhance the cooling function of the rotor and to provide a motor with stable performance.

[0007]

According to a first aspect of the present invention, in a space in a frame, a shaft body, a cylindrical rotor surrounding the shaft body and integrally attached to the shaft body, and A cylindrical stator surrounding the rotor is provided, a cooling fluid path is formed between the shaft body and the rotor, and a cooling fin is formed on an end face of the rotor. The shaft body is provided with a fluid in the space. In a motor equipped with a fan for circulating in the cooling fluid passage, a cylindrical partition wall that partitions the fin and the cooling fluid passage is provided at an end of the rotor at the inlet of the cooling fluid passage. The motor is characterized by that.

[0008] With such a configuration, the cylindrical partition wall provided at the inlet of the cooling fluid passage inside the rotor does not affect the cooling medium immediately before the inlet of the cooling fluid passage due to the rotation of the rotor fins. The circulation amount can be greatly increased, and the cooling efficiency can be improved.

The invention according to claim 2 is the motor according to claim 1, characterized in that the height of the partition wall is larger than the height of the fins. Therefore, immediately before the inlet of the cooling fluid passage due to the rotation of the rotor fins. The effect on the cooling medium can be further reduced, and the cooling efficiency can be further improved.

A third aspect of the present invention is the motor according to the first or second aspect, wherein the partition wall has a tapered shape that widens from the rotor side end toward the other end. This makes it possible to reduce the influence of the fins and improve the cooling efficiency while maintaining the smooth flow of the fluid into the cooling fluid passage of the rotor.

The invention according to claim 4 is the motor according to any one of claims 1 to 3, wherein the partition wall is formed integrally with the end ring having the fin formed therein. . The invention according to claim 5 is characterized in that the partition wall is detachably attached to an end ring on which the fin is formed.
A motor according to any one of the above.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dry underwater motor will be described below with reference to FIG. The same parts as those in the conventional example described above are denoted by the same reference numerals and the description thereof is omitted. The difference between this embodiment and the conventional example shown in the figure is that a cylindrical partition wall 13 is arranged at the inlet of the rotor ventilation passage 6. This partition 1
3, a flange portion 14 on the inner end side, a tapered portion 15 extending linearly from the inner end side to the outer end side, and a bosh section 16 spreading further with a curvature on the outer end side are made of plastic or metal. It is formed integrally and is attached to the end ring 9 by using a bolt 18.

As shown in the figure, the height of the partition wall 13 is such that when the partition wall 13 is attached to the end ring 9, the taper portion 15 has a fin 1
0, and the bosh section 16 extends outward so as to cover the fin 10. And morning glory part 16
Extends toward the top of the stator coil end 4a,
Here, a smooth flow path connecting the frame ventilation path 8 to the rotor ventilation path 6 is configured.

In the motor having such a structure, when the motor is started and the shaft 2 is rotated, the cooling air discharged by the fan 5 in the outer peripheral direction is transferred to the frame ventilation passages 8.
A circulation flow path is formed that flows to the lower core chamber 11, the rotor ventilation path 6, and the upper core chamber 12 and returns to the suction port of the fan 5.
In the lower core chamber 11, as shown in FIG.
, And is guided to the rotor ventilation passage 6 smoothly.

On the other hand, the flow from the gap between the top of the coil 4a and the edge of the bosh 16 toward the fin 10 is small in the vertical cross section along the back surface of the partition wall 13 and the coil surface as shown in the drawing. It forms a circulating flow and is also flowed in the circumferential direction by the fins 10. However, since the entrance of the rotor ventilation passage 6 is separated from the fins 10 by the partition walls 13, the flow toward the rotor ventilation passage 6 is prevented from being affected by the fins 10. Therefore, the amount of air for cooling the rotor can be greatly increased, and the cooling efficiency can be improved.

FIG. 2 shows another embodiment of the mounting structure of the partition wall 13. The mounting hole 14 of the flange portion 14 of the partition wall 13 is shown in FIG.
a into the balance pole 17 of the end ring 9,
The pole 17 is crushed and fixed by hitting.

In another embodiment shown in FIG. 3, the partition wall 1
3 is attached to the main shaft 2. That is, the partition 13 is
It protrudes from the main shaft 2 in the radial direction and is fixed to an end face of a branch portion 2a for mounting the rotor with a bolt.

Table 1 Location Conventional cooling method Cooling method of the present invention Frame ventilation passage 6-8 m / sec 14-16 m / sec Rotor ventilation passage 14-18 m / sec 18-22 m / sec

Table 1 shows the cooling air flow velocity in the motor of the embodiment in comparison with the conventional motor. As shown in this table, the cooling air flow rate can be increased 1.5 to 2 times as compared with the conventional case.

FIG. 4 shows still another embodiment, in which the end ring 9 is used when the rotor core 4 is die-cast.
Further, the rotor fin 10 and the partition 13 at the entrance of the rotor ventilation passage 6 are integrally manufactured. In this example,
Man-hours for manufacturing the partition 13 can be reduced, and costs can be reduced.
In addition, the strength of the rotor fin 10 is increased, and the durability is improved. Further, the heat radiation area of the rotor increases, and the cooling performance also improves.

In the above example, the partition wall 13 is attached to the rotating side portion, but it may be attached to the frame side or the fixed side such as the stator. In the above-described example, the present invention is applied to a dry-type underwater motor. However, the present invention can also be applied to a liquid-sealed underwater motor in which the inside is filled with an appropriate liquid, and a land-based motor.

[0022]

As described above, in the motor according to the present invention, the flow rate of the cooling fluid to the rotor fluid passage inside the motor is regulated to increase the flow rate without losing the heat exchange promoting action of the rotor fins. And cooling efficiency can be greatly improved. For this reason, the rotor core can be efficiently cooled to prevent the motor from being damaged by the heat of the rotor core, and the rotor core can be reduced in size and the motor body can be reduced in weight.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a motor according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a motor according to a fourth embodiment of the present invention.

FIG. 5 (a) is a partially cutaway front view of a conventional motor,
(B) It is a top view.

6 is a cross-sectional view of a main part of the motor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Main shaft 3 Rotor core 4 Stator core 4a Stator coil 5 Fan 6 Rotor ventilation path (cooling fluid path) 8 Frame ventilation path 9 End ring 10 Fin 11 Lower core chamber 12 Upper core chamber 13 Partition wall 15 Tapered section 16 Bosh section 17 Balance Pole

Claims (5)

[Claims] 1. A shaft body, a rotor surrounding the shaft body and integrally attached to the shaft body in a space in the frame,
A stator surrounding the rotor is provided, a cooling fluid path is formed between the shaft body and the rotor, and a cooling fin is formed on an end surface of the rotor, and the shaft body is cooled to cool the fluid in the space. A motor provided with a fan for circulating the fluid passage, wherein the cooling fluid passage has an inlet provided with a cylindrical partition wall for partitioning the fin and the cooling fluid passage. 2. The motor according to claim 1, wherein a height of the partition wall is larger than a height of the fin. 3. The motor according to claim 1, wherein the partition wall has a tapered shape that widens from an end portion on the rotor side toward the other end side. 4. The motor according to claim 1, wherein the partition wall is integrally formed with an end ring having the fin. 5. The motor according to claim 1, wherein the partition wall is detachably attached to an end ring having the fin.