JP2003143800A - Totally-enclosed fan-cooled motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise to passengers in a vehicle without causing cooling capability to deteriorate. SOLUTION: A totally-enclosed fan-cooled motor for vehicle does not have an air inlet port for taking in cooling air formed on the upper half of the motor without forming an air intake cover (16) on one end face of the motor, and the air intake cover (16) has an air intake port (16a) for taking cooling air into only the lower half of the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle full-closed outer fan electric motor used as a main electric motor in an electric vehicle.

[0002]

2. Description of the Related Art A main electric motor for a vehicle is arranged under the floor of the vehicle so as to be attached to a bogie frame. Since this type of traction motor is operated under severe environmental conditions such as dust and rainwater, a totally enclosed fan motor is used. FIG. 7 shows an arrangement situation of this kind of main motor.

In FIG. 7, wheels 21a, 21 are provided at both ends.
An axle 22 to which b is fixed is rotatably attached to a bogie frame 23 of the vehicle. Wheels 21a and 21b are rails 24
Rotate on a and 24b. A main motor 25 is arranged near the axle 22. The main motor 25 is a bogie frame 23.
It is attached by a mounting bolt 26. The output shaft of the main motor 25 is connected to the axle 22 via a joint 27 and a reduction gear 28. The main motor 25 is an induction motor configured as a fully closed fan motor.

FIG. 8 shows a fully-closed outer fan type main motor of this type. In the main motor of FIG. 8, the housing is formed by the bearing brackets 1a and 1b and the frame 2 on both end surfaces. Bearing bracket 1
A shaft 3 is provided rotatably through the bearings 2a and 2b, penetrating the a and 1b. A stator iron core 4 is fixed to the bearing bracket 1a via iron core retainers 14a and 14b, and a rotor iron core 5 is mounted on the shaft 3 so as to face the stator iron core 4 via a predetermined magnetic gap. The rotor iron core 5 is axially fixed by iron core retainers 6a and 6b. A stator coil 7 is wound around the stator iron core 4, and a rotor bar 9 having an end ring 8 is provided on the rotor iron core 5.

In this motor, the bearing 2b side is the drive side of the shaft 3, and the bearing 2a side is the non-drive side. The non-driving side of the shaft 3 slightly protrudes from the bearing bracket 1a to the outside, and the outer fan 10 is attached to the protruding portion. A frame 12 is additionally provided on the outer peripheral side of the bearing bracket 1a in order to form an air passage 11 on the outer peripheral portion of the stator core 4 including the outer fan 10. An air inlet guard 13 is arranged on the end face side of the electric motor of the outer fan 10, and an exhaust port 15 is formed at the end face portion of the stator core 4 on the drive side as an end point of the air passage 11.

In the electric motor shown in FIG. 8, the cooling air is taken in through the air intake guard 12 at the end face of the electric motor on the non-driving side by the outer fan 10, and the cooling air introduced from here advances initially in the radial direction, and the electric motor is driven. At the outer peripheral portion of the end face, the direction is changed from the radial direction to the axial direction and is guided to the air passage 11 formed along the axial direction on the outer peripheral surface of the electric motor to cool the electric motor. The cooling air guided to the air passage 11 formed on the stator core 4 removes heat from the periphery of the stator core 4 in the process of the flow indicated by the arrow P, and suppresses the temperature rise of the main motor.

[0007]

The external fan 10 is provided with an air passage 11
Not only does it achieve the original function of sending cooling air to, but it also produces undesired noise in other aspects. That is,
This noise makes passengers in the vehicle uncomfortable. In order to suppress this noise to a low level, the first conceivable idea is to reduce the diameter of the outer fan, but reducing the diameter of the outer fan directly leads to a reduction in the cooling air volume. When the cooling air volume decreases, the cooling performance decreases correspondingly and the temperature rise increases, which becomes a factor that hinders the downsizing of the main motor.

Therefore, an object of the present invention is to provide a fully-closed fan-type motor for a vehicle, which can reduce noise, particularly noise for passengers in the vehicle, without significantly lowering the cooling performance.

[0009]

In order to achieve the above object, the invention according to claim 1 is such that a cooling wind introduced from one end face portion of the electric motor by an outer fan attached to the electric motor rotating shaft is the outer periphery of the end face of the electric motor. In the vehicle completely closed fan-type electric motor, the direction of which is changed from the radial direction to the axial direction at the portion, and which is guided to the wind passage formed along the axial direction on the outer peripheral surface of the electric motor.
On one end face of the electric motor that takes in cooling air, without forming an inlet for taking in cooling air in the upper half of the electric motor, an air intake cover with an inlet for taking in cooling air only in the lower half of the electric motor is provided. It is characterized by being provided.

According to a second aspect of the present invention, in the vehicle total enclosed outer fan type electric motor according to the first aspect, the flow rate adjusting plate for causing the cooling air taken in from the air inlet to be evenly distributed over the entire circumference of the electric motor. Is provided near the air inlet in the air inlet cover.

According to a third aspect of the present invention, the cooling air introduced from one end face portion of the electric motor is converted from the radial direction to the axial direction at the outer peripheral portion of the electric motor by the external fan attached to the electric motor rotating shaft, A fully-closed outer fan electric motor for a vehicle, which is configured to be guided to an air passage formed along an axial direction on an outer peripheral surface of an electric motor, is provided with an air inlet cover having an air inlet for taking in cooling air at one end surface portion of the electric motor, Moreover, a partition plate for suppressing the energy of sound propagating to the outside is arranged in the air inlet cover.

According to a fourth aspect of the invention, the cooling air introduced from one end face portion of the electric motor is converted from the radial direction to the axial direction at the outer peripheral portion of the electric motor by the external fan attached to the electric motor rotating shaft, In a fully-closed fan-type motor for a vehicle, which is configured to be guided to an air passage formed along an axial direction on an outer peripheral surface of an electric motor, among exhaust ports formed in a cooling air outlet of the air passage, an exhaust port facing upward It is characterized in that a closing cover for closing the exhaust port is provided, and the exhaust is performed only through the exhaust port facing downward.

According to a fifth aspect of the present invention, the cooling air introduced from one end face portion of the electric motor is converted from the radial direction to the axial direction at the outer peripheral portion of the electric motor by an external fan attached to the electric motor rotating shaft, A fully-closed external fan electric motor for a vehicle, which is configured to be guided to an air passage formed along an axial direction on an outer peripheral surface of an electric motor, in which an upward cooling air is taken in a lower portion of one end surface portion of the electric motor which takes in cooling air. In addition to the air inlet, the second air inlet that takes in cooling air in the axial direction is provided on the end face, and the first and second air inlets are further communicated on the end face with the radial air passage in the machine. It is characterized in that a third air inlet is provided.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment according to claim 1. The basic structure of this electric motor is shown in Fig. 8.
It is the same as the electric motor shown in. The feature of this embodiment resides in that an air inlet cover 16 having an air inlet 16a is provided only at the lowermost portion from the passenger seat in the vehicle, that is, on the side facing the ground, at the end face portion on the opposite side of the electric motor. As a result, the noise of the external fan 10 viewed from the passenger seats in the vehicle can be reduced without significantly sacrificing the cooling air volume.

FIG. 2 shows a second embodiment according to claim 2. The feature of this embodiment is that the inlet 16
This is because a flow rate adjusting plate 17 for distributing the cooling air taken in from a through the entire circumference of the electric motor as evenly as possible is provided near the air inlet 16a. By doing so, the cooling air taken in from the air inlet 16a can be distributed more evenly over the entire circumference of the electric motor, and a decrease in cooling efficiency can be prevented.

FIG. 3 shows a third embodiment according to claim 3. The feature of this embodiment is that an air inlet cover 16 having an air inlet 16b on the end face is provided at the end face portion on the non-driving side of the electric motor, and a resistor that is too large against cooling air is provided inside the air inlet cover 16. This is because the partition plate 18 that suppresses the energy of sound propagating to the outside to the extent that it does not occur is provided. A discharge port 16a for discharging dust and water droplets is formed on the bottom surface of the intake cover 16. As a result, the noise of the external fan 10 viewed from the passenger seats in the vehicle can be reduced without significantly sacrificing the cooling air volume.

FIG. 4 shows a fourth embodiment according to claim 4. The feature of this embodiment is based on the electric motor structure shown in FIG. 8, and its exhaust port 15 is closed by a closing cover 19 in the upper half of the electric motor which is close to the passenger seat in the vehicle and faces the passenger seat in the vehicle. Except for this, it is designed so that only the center of the lower half is exhausted. By doing so, noise propagation from the upper part of the main motor, that is, the part of the motor closest to the passenger seat in the vehicle can be largely prevented.

5 and 6 show a fifth embodiment according to the fifth aspect. The feature of this embodiment is that the air intake chamber 20d is formed on the end face of the electric motor by using the end plate 20 based on the electric motor structure shown in FIG. 8, and the air is introduced into the air intake chamber 20d from the lower side to the upper side. Air inlet 2
0a and the cooling air introduced through the inlet net 20e from the axial direction of the end face are introduced, and the inlet 20c facing the shaft end of the external fan 10 is further introduced from here. It guides the cooling air through the air passage. With this configuration, the air volume can be increased and noise can be suppressed, and the electric motor can be reduced in size and weight and reduced in noise.

[0019]

As described above, according to the present invention, it is possible to reduce noise, particularly noise for passengers in a vehicle, without significantly reducing cooling performance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a main part showing a fifth embodiment of the present invention.

FIG. 6 is a diagram of the embodiment of FIG. 5 viewed from the line AA.

FIG. 7 is a plan view showing a state of a vehicle main motor mounted on a truck.

FIG. 8 is a vertical cross-sectional view showing a conventional fully-closed fan-type electric motor.

[Explanation of symbols]

1a, 1b Bearing bracket 2 frames 2a, 2b bearing 3 axes 4 Stator iron core 5 rotor core 6a, 6b Iron holder 6 End ring 7 Stator coil 8 end rings 9 rotor bar 10 outdoor fan 11 wind path 12 frames 13 Wind guard 14a, 14b Iron core retainer 15 exhaust port 16 Air intake cover 16a Air inlet 16b outlet 17 Flow rate adjusting plate 18 partition boards 19 Closure cover 20 End plate 20a, 20b, 20c Air inlet 20d Inlet room 20e Air intake net 21a, 21b wheels 22 axles 23 trolley frame 24a, 24b rail 25 Main motor 26 Mounting bolt 27 joint 28 reduction gear

Continued front page    F-term (reference) 5H013 LL07 MM06                 5H605 AA01 AA05 BB05 BB10 BB17                       CC01 CC02 DD07 DD11 DD21                       EA02                 5H609 BB02 BB19 PP02 PP05 PP06                       PP08 QQ02 RR02 RR27 RR36                       RR38 RR67 RR69 RR70 SS12

Claims (5)

[Claims] 1. A cooling air introduced from one end surface portion of the electric motor is converted from a radial direction to an axial direction at the outer peripheral surface of the electric motor by an external fan attached to the rotary shaft of the electric motor, and the cooling air is axially directed to the outer peripheral surface of the electric motor. In a fully-closed fan-type electric motor for a vehicle, which is configured to be guided to an air passage formed along a line, an air inlet for taking in cooling air is formed in an upper half of the electric motor at one end face portion of the electric motor for taking in the cooling air. A fully-closed fan-type electric motor for vehicles, characterized in that an air-intake cover having an air-intake port for taking in cooling air is provided only in the lower half of the electric motor. 2. The fully-closed fan electric motor for a vehicle according to claim 1, wherein a flow rate adjusting plate for evenly distributing the cooling air taken in from the air inlet over the entire circumference of the electric motor is introduced into the air inlet cover. A fully-closed fan-type electric motor for a vehicle, which is provided in the vicinity of the air inlet. 3. A cooling air introduced from one end surface of the electric motor is converted from a radial direction to an axial direction at the outer peripheral surface of the electric motor by an external fan attached to the rotary shaft of the electric motor, and the cooling air is axially directed to the outer peripheral surface of the electric motor. In a fully-closed fan fan electric motor for a vehicle, which is adapted to be guided to an air passage formed along a line, an air inlet cover having an air inlet for taking in the cooling air is provided at one end face portion of the electric motor, and A fully-closed fan-type electric motor for a vehicle, characterized in that a partition plate for suppressing the energy of sound propagating to the outside is provided in the air cover. 4. A cooling air introduced from one end surface portion of the electric motor is converted from a radial direction to an axial direction at the outer peripheral surface of the electric motor by an external fan attached to the rotary shaft of the electric motor, and the cooling air is axially directed to the outer peripheral surface of the electric motor. A fully-closed external fan electric motor for a vehicle, which is configured to be guided to an air passage formed along a line, of the exhaust ports formed at the cooling air outlet of the air passage, the exhaust port facing upward is closed to close the exhaust port. A fully-closed outer fan electric motor for a vehicle, which is provided with a cover and discharges only from an exhaust port facing downward. 5. A cooling air introduced from one end surface portion of the electric motor by an outer fan attached to the electric motor rotating shaft changes its radial direction from the axial direction to the axial direction at the outer peripheral surface of the electric motor end surface, and the axial direction is applied to the outer peripheral surface of the electric motor. In a fully-closed fan-type electric motor for a vehicle, which is adapted to be guided to an air passage formed along a line, a first air inlet for taking in the upward cooling air is provided at a lower portion of one end face portion of the electric motor for taking in the cooling air. A second air inlet for taking in cooling air in the axial direction is provided on the end face portion,
Further, a third closed air fan type electric motor for a vehicle is provided with a third air intake opening that connects the first and second air intake openings to a radial air passage in the machine at the end face portion.