JP2951244B2 - Main motor for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-venting type vehicle main motor such as an induction motor mainly used for driving an electric vehicle.

[0002]

2. Description of the Related Art Generally, a radial fan is used as a cooling fan for a self-ventilated vehicle main motor. However, in the case of the radial fan, the amount of ventilation is substantially proportional to the rotation speed of the fan and the outer diameter of the fan blades. For this reason, when the vehicle is traveling at high speed, the current is small and the amount of cooling air may be small, but the amount of ventilation becomes excessively large, and accordingly the wind noise increases and the noise is reduced. Was an obstacle.

Therefore, as a self-ventilated vehicle main motor capable of reducing the noise while securing a required cooling air flow, a self-ventilated vehicle main motor having an axial flow fan provided on both sides of a rotor core is firstly described. An electric motor was proposed. FIG. 7 is a diagram showing the above-described self-ventilated vehicle main motor provided with two axial fans.

In FIG. 7, 1 is a rotor core, 2 is a rotor shaft, 3A and 3B are ventilation holes, 4A and 4B are axial fans,
5 is an axial fan blade, 6 is a bracket, 7 is a bearing box,
Numeral 8 is an air hole provided in the rotor core, and the axial fans 4A and 4B fixed to the rotor shaft rotate to allow cooling air to flow inside the machine to cool the vehicle main motor. Axial fan 4
The blades 5 of A and 4B have the same inclination with respect to the direction of the rotor axis, and the axial fans 4A and 4B are arranged on both sides of the rotor core 1 so that the mutual ventilation works. ing.

In the above configuration, when the rotational direction of the vehicle main motor is in a certain direction, the cooling air is discharged to one end in the machine by the discharging action of one axial fan, for example, the axial fan 4A and the pushing action of the axial fan 4B. The air is introduced from the ventilation port 3B, flows between the stator and the rotor in the machine as shown by the dashed arrow in FIG. 7, and is discharged from the other ventilation port 3A. On the other hand, when the rotation direction of the vehicle main motor is in another direction,
The cooling air is introduced from the other end side ventilation port 3A in the machine by the discharging action of the other axial fan, for example, the axial fan 4B and the pushing action of the axial fan 4A, and is fixed in the machine as shown by the solid arrow in FIG. It flows between the rotor and the rotor and is discharged from the one end side ventilation port 3B.

[0006] By the above-mentioned ventilation function, the cooling air flows through the inside of the vehicle main motor, and the vehicle main motor can be cooled regardless of the rotation direction. At that time, the amount of cooling air can be secured by using two axial fans in which the ventilation action works in a sum, and the axial fan is more efficient than the conventional radial fan. Can be made smaller in diameter than when a radial fan is used, and wind noise can be reduced.

[0007]

An axial fan is originally a fan having a characteristic of low static pressure, and when it is mounted on a main motor, its air flow is reduced due to its ventilation resistance. As a countermeasure, in the vehicular main motor shown in FIG. 7, the axial width of the blades of the axial fan was made as large as possible to secure the air volume. Had become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first object of the present invention is to make it possible to secure a required amount of cooling air and to make the flow of cooling air uniform to reduce noise. It is an object of the present invention to provide a self-ventilated vehicle main motor that can be made more compact. A second object of the present invention is to
It is an object of the present invention to provide a self-venting type vehicle main motor capable of improving the efficiency of an axial fan and sufficiently coping with a large capacity.

[0009]

According to a first aspect of the present invention, there is provided a self-ventilating type in which axial fans are arranged on both sides of a rotor core to allow cooling air to flow through the machine. in the vehicle traction motors, opposite the axial fan
Distance between the bracket and bearing box and the fan of the axial fan
L, the axial wing of the wing at the average diameter of the wing
When the width is W, L is 50% to 80% of L + W.
Things.

According to a second aspect of the present invention, in the first aspect, the number of blades of the axial flow fan on both sides of the rotor core is set.
In the circumferential direction where the wing contacts the rotor core
Wind holes provided in the rotor core while keeping the positions approximately the same
The number of wings is the same as the number of wings.
Rotate the air hole in the rotor core around the circumference so that the air hole in the core is located.
Are arranged substantially equally .

According to a third aspect of the present invention, in the first aspect of the present invention, the number of blades of the axial flow fan on both sides of the rotor core is provided.
In the circumferential direction where the wing contacts the rotor core
Wind holes provided in the rotor core while keeping the positions approximately the same
Is n times the number of wings (n is a positive integer), and between each wing
Rotor core so that n air holes of rotor core are located
Are arranged substantially uniformly on the circumference .

[0012]

FIG. 2 is a view showing actual measurement data of the flow rate of the axial fan when the width of the blade of the axial fan of the main motor is changed.
The horizontal axis of the figure indicates the ratio W / Wmax of the blade width W of the axial fan to the maximum value Wmax of the blade width of the axial fan, and the vertical axis indicates the airflow Q of the axial fan. Note that the maximum value Wma
x is the maximum width that the axial fan blade can take for the bracket / bearing box facing the axial fan blade.

As shown in FIG. 1, W / Wmax at which the maximum value Qmax of the air volume is obtained is in a range where W / Wmax is approximately 50% or less, and the smaller the width of the blade is (in FIG. (When the width W is WB or WC), the air volume is larger than when the blade width is wide (in the figure, when the blade width W is WA). This can be explained as follows.

FIG. 3 is a diagram showing a performance characteristic curve of the axial fan alone (solid line in FIG. 3) and a ventilation resistance curve (broken line in FIG. 3) of the main motor to which the present invention is applied. The vertical axis indicates the pressure H, A is when the blade width of the axial fan is large, B is when the blade width is intermediate, C is when the blade width is small (WA, WB and WC in FIG. (Corresponding to each other).

As shown in FIG. 3, the cooling air volume of the main motor having the axial fan is determined by the performance characteristics of the axial fan alone (see FIG. 3).
(Solid line) and the ventilation resistance curve (dotted line) inside the main motor having the axial fan, and the intersection is the operating point. As is apparent from FIG. 3, the width WA is added to the main motor.
When an axial fan with blades of WB, WB and WC is installed, the performance of the axial fan alone is best with a blade of width WA. However, as the blade width increases, the ventilation resistance inside the main motor increases. Is larger, the air volume QA at the operating point is smaller than the air volumes QC and QB of the axial flow fan having blades of widths WC and WB.

In the case of an axial fan having the smallest blade width (axial fan having a blade width of WC), the performance itself of the fan itself is inferior. It is smaller than the airflow QB of the axial fan. That is, it is understood that the width WB at which the maximum air volume can be obtained exists between the widths WA and WC of the blades of the axial fan.

According to the first aspect of the present invention, since the above-described configuration is adopted based on the above principle, a sufficient air flow required for cooling can be secured in the self-ventilated main motor for a vehicle. It is possible to sufficiently cope with increasing the capacity of the electric motor. In the invention of claim 2 of the present invention, in the invention of claim 1, the number of blades on either side axial flow fan of the rotor core is the same, and the circumferential positions of the wing is in contact with the rotor core while substantially the same, the number of air holes provided in the rotor core and the same as the number of blades, substantially the center between the wings
So that the wind hole of the rotor core is
The holes are arranged substantially evenly on the circumference . For this reason, the amount of air flowing between each blade of the axial fan can be made uniform,
The turbulence of the cooling air can be reduced. Therefore,
The required amount of cooling air can be ensured, and noise can be reduced.

According to a third aspect of the present invention, in the first aspect , the number of blades of the axial flow fans on both sides of the rotor core is the same, and the blades are arranged in the circumferential direction where the blades are in contact with the rotor core. position with a substantially identical to, n times the number the number of blades of air holes provided in the rotor core (n is a positive integer) and, between each wing
Rotor core so that n air holes of rotor core are located
Are arranged substantially uniformly on the circumference . Therefore, similarly to the second aspect of the invention, it is possible to reduce noise while securing a necessary air volume, and to reduce the temperature distribution of the rotor iron core.
Since the number of air holes can be made uniform by increasing the number, the cooling efficiency can be improved.

[0019]

FIG. 1 is a view showing a first embodiment of the present invention. Parts other than the structure shown in FIG. 1 have the same structure as in FIG. 7, and the same components are denoted by the same reference numerals. Is attached,
1 is a rotor core, 2 is a rotor shaft, 4B is an axial fan, 5
Is a wing, 6 is a bracket, and 7 is a bearing box.

In this embodiment, as shown in FIG. 1, the axial width of the blade 5 of the axial fan 4B is W, and the distance between the blade 6 and the bracket 6 and the axle box 7 facing each other is W. L (wing 5
At the position of the average diameter φD)
The configuration is such that the distance L is greater than the axial width W of the blade 5. In the figure, Wmax is the maximum value of the blade width of the axial fan.

That is, in this embodiment, as shown in the figure, the axial width W of the blade 5 is selected to be W = WB, and the airflow of the axial fan is increased. In addition, WA>WB>
WC, and WA, WB, and WC in FIG.
, WB, and WC. In this embodiment, since the axial fan of the vehicle main motor is configured as described above, the airflow of the axial fan can be increased as described with reference to FIG. For this reason, a sufficient amount of cooling air can be ensured, and it is possible to sufficiently cope with an increase in the capacity of the vehicle main motor.

In particular, as is apparent from FIG. 2, by setting the distance L to be 50% to 80% of the sum L + W of the distance L and the width W, it is possible to obtain a substantially maximum air volume, and it is efficient. The axial fan can be operated, and a large-capacity vehicle main motor can be cooled. 4 and 5 are views showing a second embodiment of the present invention. FIG. 4 is a partially enlarged view of a blade when a joint between an axial fan and a rotor core is viewed from an axial direction. 5 shows a view in the direction of arrow A in FIG.

In the figure, the same reference numerals as those in FIG. 7 denote the same components, 2 denotes a rotor shaft, 5 denotes a wing, 8 denotes an air hole provided in a rotor core, 9 denotes a guide ring, and 10 denotes a guide ring. The axial fans 4A and 4B are composed of wings 5, guide rings 9 and bosses 10, as shown in FIG. In addition,
Portions other than those shown in FIGS. 4 and 5 have the same configuration as FIGS. 7 and 1.

As shown in FIGS. 4 and 5, in this embodiment, the number of blades 5 of the axial flow fan and the number of air holes 8 of the rotor core 1 are the same, and the blades 5 1 and the rotor core 31 and the rotor core 31 so that the air hole 8 of the rotor core 1 is located substantially at the center between the blades.
The air hole is arranged. For this reason, the amount of air flowing between the blades of the axial fan becomes uniform, the turbulence of the cooling air can be reduced, and the generation of noise can be suppressed while ensuring a sufficient amount of air.

FIG. 6 is a view showing a third embodiment of the present invention. FIG. 6 is a partially enlarged view of a joint between an axial fan and a rotor core viewed from the axial direction. Among them, those having the same reference numerals as those shown in FIG. 7 indicate the same components.
This embodiment is different from the second embodiment in that the blade 5 of the axial fan
The number of air holes of the rotor core 8 is multiplied by a multiple of the number of the holes.

That is, in this embodiment, as shown in FIG. 6, the blades 5 of the axial fans 4A and 4B are
At a position where the blades 5 are joined, a plurality of air holes 8 are arranged substantially uniformly in a space uniformly partitioned by the blades, and when the rotation angle of the axial fan is at a predetermined angle, the blade tip of the blade 5 Are configured so as not to overlap with the air holes 8. In the present embodiment, since the configuration is as described above, the turbulence of the cooling air can be reduced as in the second embodiment, and the generation of noise can be suppressed while sufficiently securing the air volume. . Further, since the number of the air holes is set to be plural times that of the second embodiment, the temperature distribution of the rotor core can be made more uniform than that of the second embodiment by the increased number of the air holes. Can be improved.

In the above embodiment, the shape of the air holes is circular, but the shape and size of the air holes can be appropriately selected, and the number of the air holes can be appropriately selected as necessary. Can be.

[0028]

As described above, the present invention has the following effects. (1) The width of the blade of the axial fan is reduced, and the distance L between the bracket and the bearing box facing the axial fan and the blade of the axial fan is set at the position of the average diameter of the blade. The width is greater than the width W in the axial direction, so that the self-ventilated main motor for a vehicle can secure a sufficient amount of air required for cooling, and sufficiently cope with an increase in the capacity of the main motor. Becomes possible.

In particular, by setting the distance L to be 50% to 80% of the sum L + W of the distance L and the width W, it is possible to achieve a substantially maximum air volume and to operate the axial fan more efficiently. Thus, a large-capacity vehicle main motor can be cooled. (2) In the self-ventilated vehicle main motor having the above configuration,
The number of blades of the axial fans on both sides of the rotor core is the same,
And, while the wing is the position in the circumferential direction in contact with the rotor core substantially the same, the number of air holes provided in the rotor core and the same as the number of blades, the air hole of substantially the center of the rotor core between each wing Rank
So that the air holes in the rotor core are
With this arrangement, the amount of air flowing between the blades of the axial fan can be made uniform, the turbulence of the cooling air can be reduced, and the required amount of air can be secured while further reducing noise.

Further, by making the number of air holes provided in the rotor core a plurality of times the number of blades, the temperature distribution of the rotor iron core can be made uniform by the increase in the number of air holes, and the axial flow fan It is possible to make the amount of air flowing between the blades uniform and improve the cooling efficiency.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a view showing measured airflow data when the width of a blade of an axial fan is changed.

FIG. 3 is a diagram showing a relationship between performance of an axial fan and ventilation resistance.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a positional relationship between air holes and blades of a rotor core in a second embodiment.

FIG. 6 is a diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram showing a self-ventilated vehicle main motor provided with two axial fans.

[Explanation of symbols]

 Reference Signs List 1 rotor core 2 rotor shaft 3A, 3B ventilation hole 4A, 4B axial fan 5 blade 6 bracket 7 bearing box 8 air hole 9 guide ring 10 boss

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kisaki Kiyama 3-8-2 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Toyo Electric Manufacturing Co., Ltd. Yokohama Works (72) Inventor Masatoshi Abe Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa No. 3-8-2 Toyo Denki Mfg. Co., Ltd. Yokohama Works (56) References Japanese Utility Model Showa 59-149460 (JP, U) Japanese Utility Model Showa 50-87402 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02K 9/00-9/28

Claims (3)

(57) [Claims] 1. A self-venting vehicle main motor for arranging an axial fan on both sides of a rotor core and allowing cooling air to flow inside the machine, comprising: a bracket and a bearing box facing the axial fan;
The distance between the blades of the axial fan is L, the position of the average diameter of the blades
Where W is the axial width of the wing at L, L is L + W
A main motor for a vehicle, characterized in that the ratio is 50% to 80% . 2. A blade of an axial fan on both sides of a rotor core.
Circumferential direction where the number is the same and the wing contacts the rotor core
And the number of air holes provided in the rotor core is the same as the number of blades.
Rotate so that the wind hole of the rotor core is located approximately in the center between the blades.
2. The main motor for a vehicle according to claim 1, wherein the air holes of the trochanter core are arranged substantially uniformly on the circumference . 3. A blade sheet of an axial fan on both sides of a rotor core.
Circumferential direction where the number is the same and the wing contacts the rotor core
And the number of air holes provided in the rotor core is n times the number of blades (n is
), And there are n wind holes in the rotor core between each wing.
So that the air holes in the rotor core are evenly distributed around the circumference
The main motor for a vehicle according to claim 1, wherein: