JP5197962B2 - Induction motor for vehicles - Google Patents

Description

  The present invention relates to a vehicle induction motor, and particularly relates to a structure of a ventilation fan that cools a coil portion of the motor.

  As an example of a structure in which cooling inside a motor for a vehicle is performed by a ventilation fan, a frame body is formed by providing first and second covers at end portions of a cylindrical body, and a plurality of exhausts are formed on a peripheral surface of the second cover. Provided with a plurality of air intake ports on the rotating shaft side of the first cover and a dust exhaust port outside the outer periphery of the ventilation fan, and a plurality of air exhaust ports in the axial direction of the second cover. 2 is exhausted from the exhaust port by the auxiliary fan on the cover side. On the other hand, a configuration is shown in which rainwater and dust contained in the outside air taken in from the intake port are discharged from the dust discharge port (for example, Patent Document 1).

JP 2000-324758 A

  In the structure of the vehicle electric motor shown in Patent Document 1, the heat generated by the motor operation is removed by cooling air passing through the ventilation hole of the rotor and the gap between the stator and the rotor. The stator coil or rotor conductor, which is the main heating element, is indirectly cooled via the stator or rotor that supports it. Cooling by the ventilation fan is not efficient, and the auxiliary fan is Since it is provided, there is a problem that the size of the electric motor is increased and the cost is increased accordingly.

  The present invention has been made in order to solve the above-described problems, and the cooling air from the ventilation fan directly hits the stator coil and the rotor conductor so that the coil is directly cooled and cooled. Provided is a vehicle electric motor that is improved in efficiency and reduced in size without requiring an auxiliary fan.

The vehicle induction motor according to the present invention includes a stator core provided with a stator coil, a frame for holding the stator core, a rotor conductor fixed to a shaft, and a vent hole in an axial direction. A rotor core having a first cover provided at one end of the frame and having a plurality of intake ports in the axial direction; and a second cover provided at the other end of the frame and having a plurality of exhaust ports in the axial direction and the outer periphery. An inner diameter side blade provided at a position facing the end of the rotor conductor between the rotor core and the first cover, which is fixed to the shaft.
An outer-diameter side blade provided at a position facing the end of the stator coil between the rotor core and the first cover, which is fixed to the shaft, and is introduced from the intake port. Due to the outside air, the cooling air generated by the inner diameter blades directly acts on the rotor conductor to cool the rotor conductor, and the cooling air generated by the outer blades directly acts on the stator coil. The stator coil is cooled.

According to the vehicle induction motor according to the present invention, the stator coil and the rotor conductor, which are main heat sources, can be directly cooled by the cooling air generated by the outer diameter side blades and the inner diameter side blades. Will improve. Since the cooling air is generated by the two blades, there is an effect that the air flow increases and the cooling efficiency is improved without requiring an auxiliary fan .

Embodiment 1 FIG.
Hereinafter, this Embodiment 1 is demonstrated based on Fig.1 (a)-FIG.1 (d).
FIG. 1A is a schematic cross-sectional view of the vehicle induction motor 100. The frame 1 is provided with a stator core 2 on which a stator coil 7 is mounted, and a first cover 5 is provided at one end and a second cover 6 is provided at the other end. The first and second covers 5 and 6 are provided with bearings 14 to support the shaft 4 that fixes the rotor core 3 on which the rotor conductor 8 is mounted. Here, the first cover 5 is provided on the drive side of the vehicle induction motor 100, and the second cover 6 is provided on the non-drive side.
The rotor core 3 is provided with ventilation holes 3 a in the axial direction, and a gap G is provided between the stator core 2 and the rotor core 3. A ventilation fan 9 is fixed to the shaft 4 between the first cover 5 and the rotor core 3, that is, on the load side. The ventilation fan 9 has a structure in which an inner blade (inner diameter side blade) 9a and an outer blade (outer diameter side blade) 9b are integrally provided, and an inner blade (inner diameter side blade) 9a and an outer blade (outer diameter side blade). 9b is connected by a connecting main plate 9c and is provided so that an inner blade (inner diameter side blade) 9a covers an outer blade (outer diameter side blade) 9b. The outer blade (outer diameter side blade) 9b has a main plate 9d, and the inner blade (inner diameter side blade) 9a has an inner diameter main plate 9g. Further, a plurality of first dust discharge ports 9e on the circumference are provided on the connecting main plate 9c, and a plurality of second dust discharge ports 9f on the circumference are provided on the main plate 9d, for example, every 30 °.
These first and second dust discharge ports 9e and 9f are provided so as to have the same positional relationship in the circumferential direction so as to be in the same position in the longitudinal direction of the shaft.

  FIG. 1B is a schematic diagram showing an arrow B in FIG. 1A, and the intake air corresponding to both the inner blade side 9 and the outer blade 9 b of the ventilation fan 9 in the axial direction of the first cover 5 is shown in FIG. A plurality of air inlets 10 are provided on the circumference so as to be possible, for example, every 45 °. FIG. 1C is a schematic view showing the direction of arrow C in FIG. 1A, and a plurality of dust discharge ports 11 are provided on the outermost peripheral surface of the first cover 5, for example, every 30 °. . The dust discharge port 11 and the first and second dust discharge ports 9e and 9f of the ventilation fan 9 are installed so that the axial longitudinal directions thereof are at the same position.

  As shown in FIG. 1D, which is a schematic diagram showing the D cover in FIG. 1A, the second cover 6 is arranged on the circumference in substantially the same manner as the air inlet 10 of the first cover 5. A plurality of exhaust ports 12 are provided, and a plurality of exhaust ports 13 are formed on the outermost peripheral surface of the second cover 6 as shown in FIG. The dust outlet 11 shown in FIG.

Next, the operation will be described. In the vehicle induction motor 100 configured as described above, when AC power is input to the stator coil 7, a rotating magnetic field is generated in the stator core 2, and an electric current is supplied to the rotor conductor 8 by the rotating magnetic field. The induced current and the rotating magnetic field generate torque in the rotor core 3 and the shaft 4 rotates to drive the wheels of the vehicle.
While the motor 100 is in operation, the temperature of each part of the motor rises due to copper loss due to current between the stator coil 7 and the rotor conductor 8 and iron loss generated in the stator core 2 and the rotor core 3 due to the rotating magnetic field. The outside air introduced from the air inlet 10 of the first cover 5 by the rotation of the ventilation fan 9 provided in 4 is connected to the ventilation holes 3 a and the stator core 2 and the rotor core 3 provided in the rotor core 3. through the gap G between to cool the respective portions is discharged out of the apparatus as shown in exhaust air F _T from the exhaust port 12, 13 of the second cover 6 below resistant limit temperature.

The flow of the cooling air generated by the ventilation fan 9 according to the first embodiment will be described in more detail. Outside air introduced from the air inlet 10 provided in the first cover 5 is an inner-diameter side blade 9a that is an inner blade of the ventilation fan 9 and an outer-diameter side blade that is an outer blade as the vehicle induction motor 100 rotates. The cooling air Fa and Fb are generated by 9b as shown in FIG. Cooling air Fa generated by inner blades (inner diameter side blades) 9a provided so as to face the rotor conductor 8 acts directly on the end of the rotor conductor 8 to cool the rotor conductor 8 efficiently. On the other hand, the cooling air Fb generated by the outer blade (outer diameter side blade) 9b provided so as to face the stator coil 7 directly acts on the end of the stator coil 7 and cools the stator coil 7 efficiently.
Moisture and dust in the outside air introduced into the aircraft from the air inlet 10 pass through the first and second dust discharge ports 9e and 9f provided in the connecting main plate 9c and the main plate 9d by the centrifugal force of the ventilation fan 9, From the dust discharge port 11 of the first cover 5, exhaust air Fc is discharged outside the apparatus.
Cooling air Fa, Fb is then discharged out as a discharge air _{F T} from the exhaust port 12, 13 of the cooling wind Fh next second cover 6 through the ventilation hole 3a of the cooling air Fg and the rotor core 3 through the gap G Is done.

As described above, the stator coil 7 and the rotor conductor 8 which are main heating elements are directly actuated and cooled by the cooling air Fa and Fb generated by the inner blade 9a and the outer blade 9b, so that the cooling efficiency is improved. . Further, since moisture and dust harmful to the vehicle induction motor 100 are discharged to the outside by the ventilating fan 9, the vehicle induction motor 100 with reduced failure and long life can be obtained.
Furthermore, since the ventilation fan 9 is provided with two blades, the generated cooling air is increased as compared with the conventional single blade structure, so that it is not necessary to provide an auxiliary fan, etc. And cost reduction.

  The opening area of the dust discharge port 11 of the first cover 5 is desirably smaller than the opening area of the suction port 10. It is also possible to achieve the object by providing a plurality of dust discharge ports 11 and adjusting some dust discharge ports 11 with blind covers or the like based on the test results.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to the drawings.
In the first embodiment described above, the ventilation fan 9 has a structure in which the inner blade 9a and the outer blade 9b are integrally provided. However, in the second embodiment, as shown in FIG. And the outer diameter side blade 16 are configured as separate bodies and are fixed to the shaft 4 between the first cover 5 and the rotor core 3. The inner diameter side blade 15 includes a blade 15a, an inner diameter main plate 15b, and an outer diameter main plate 15c. The outer diameter main plate 15c has a dust discharge port corresponding to the first dust discharge port 9e described in the first embodiment. 15d is provided.
The outer diameter side blade 16 provided so as to cover the inner diameter side blade 15 is composed of a blade 16a, an inner diameter main plate 16b, and an outer diameter main plate 16c. The inside diameter dust outlet 16d and the outside diameter dust outlet 16e corresponding to the first and second dust outlets 9e and 9f of the first embodiment are provided, and the ventilation air serving as the outside air inlet of the inner diameter blade 15 is provided. A port 16f is provided to face the blade 15a of the inner diameter side blade 15 of the inner diameter main plate 16b. The other components of the vehicle induction motor 100 are the same as those in FIG.
The ventilating action associated with the rotation of the vehicle induction motor 100 in which the inner diameter side blade 15 and the outer diameter side blade 16 are separately provided is the same as that of the first embodiment. That is, the rotor conductor 8 and the stator coil 7 are cooled and discharged by the cooling air Fa generated by the inner diameter blades 15 and the cooling air Fb generated by the outer diameter blades 16, respectively. The effect is the same as that of the first embodiment.

  In the first embodiment, the first and second dust discharge ports 9e and 9f of the ventilation fan 9, and the dust discharge port 15d of the inner diameter side blade 15 and the outer diameter side blade 16 in the second embodiment are released. The outlets 16d and 16e are not necessarily provided depending on the environmental conditions of the place where the vehicle induction motor 100 is installed. In addition, the ventilation fan 9 and the inner and outer diameter blades 15 and 16 are provided on the load side of the vehicle induction motor 100, but are provided on the opposite load side to introduce outside air from the second cover 6 side. You may make it exhaust to the 1st cover 5 side.

  The present invention is applicable to a vehicle induction motor.

It is a figure which shows schematic sectional drawing of the induction motor for vehicles by Embodiment 1 of this invention. It is a figure which shows schematic sectional drawing of the induction motor for vehicles by Embodiment 2 of this invention.

Explanation of symbols

1 frame, 2 stator core, 3 rotor core, 3a vent hole, 4 shaft,
5 First cover, 6 Second cover, 7 Stator coil, 8 Rotor conductor,
9 Ventilation fan, 9a Inner blade, 9b Outer blade, 9c Connecting main plate,
9d main plate, 9e first dust discharge port, 9f second dust discharge port, 10 air intake port,
11 dust discharge port, 12, 13 exhaust port, 15 inner diameter side blade, 16 outer diameter side blade,
G gap, 100 Induction motor for vehicles.

Claims (8)

A stator core provided with a stator coil;
A frame that holds the stator core;
A rotor core fixed to the shaft and provided with a rotor conductor and having a ventilation hole in the axial direction;
A first cover provided at one end of the frame and having a plurality of intake ports in the axial direction;
A second cover provided at the other end of the frame and having a plurality of exhaust ports in the axial direction and the outer periphery;
An inner diameter blade provided at a position facing the end of the rotor conductor between the rotor core and the first cover, which is fixed to the shaft,
An outer diameter side blade provided at a position facing the end of the stator coil between the rotor core and the first cover fixed to the shaft ;
By the outside air introduced from the intake port,
The cooling air generated by the inner diameter blades acts directly on the rotor conductor to cool the rotor conductor,
The induction motor for vehicles, wherein the cooling air generated by the outer blades directly acts on the stator coil to cool the stator coil . After the outside air introduced from the air inlet cools the rotor conductor and the stator coil,
Passing through the ventilation holes of the stator core and the gap provided between the stator core and the rotor core,
The exhaust from the second cover is discharged outside the apparatus, and water droplets and dust contained in the outside air are also discharged to the outside through the exhaust port of the second cover. The induction motor for vehicles according to 1. 2. The vehicle induction motor according to claim 1, wherein the inner diameter side blade and the outer diameter side blade are integrated. 2. The vehicle induction motor according to claim 1, wherein the inner diameter side blades and the outer diameter side blades have separate structures and are respectively fixed to the shaft. The outer diameter main plate of the inner diameter side blade, the outer diameter main plate, and the outer diameter main plate are provided with a plurality of dust discharge ports, according to any one of claims 3 and 4. The induction motor for vehicles as described. A plurality of dust outlets are provided on the outer periphery of the first cover, and water droplets and dust contained in the outside air are discharged outside the machine through the dust outlets of the first cover. The induction motor for vehicles according to claim 1 characterized by things. A stator core provided with a stator coil, a frame for holding the stator core, a rotor core fixed to a shaft and provided with a rotor conductor and having ventilation holes, and provided at one end of the frame A plurality of air intake ports in the axial direction, a first cover provided with a plurality of dust discharge ports in the outer peripheral portion, and a plurality of exhaust ports provided in the other end of the frame in the axial direction and the outer peripheral portion, respectively. A second cover provided, an inner diameter blade provided at a position fixed to the shaft and facing an end of the rotor conductor between the rotor core and the first cover, and the fixed A ventilation fan having a structure in which an outer diameter side blade provided so as to cover the inner diameter side blade and to face the end of the child coil is integrated, and the inner diameter side blade and the outer diameter side blade of the ventilation fan The connection between A plurality of first dust outlets are provided on the circumference of the plate, a plurality of second dust outlets are provided on the circumference of the main plate of the outer diameter blade, and the first cover is provided. A plurality of dust discharge ports provided in the outer peripheral portion of the first and second dust discharge ports provided in the inner and outer diameter blades are arranged at the same location in the axial direction, Cooling air generated by the inner diameter blades by the outside air introduced from the intake port directly contacts the rotor conductor, and cooling air generated by the outer diameter blades directly contacts the stator coil to cool the rotation air. Water droplets and dust that are discharged out of the machine through the vent hole of the child core and the gap between the stator core and the rotor core are discharged from the exhaust port of the second cover, and are contained in the outside air. Dust discharge of the first cover from the first and second dust discharge ports And the ventilating holes, automotive induction motor characterized in that it is released to the outside through the through the exhaust port of the second cover gaps. The induction motor for a vehicle according to claim 6 or 7 , wherein an opening area of a dust discharge port of the first cover is smaller than an opening area of an intake port of the first cover .

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