JP2011254579A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that has less risk of decrease in energy efficiency and of deterioration in insulation properties of a stator and that readily improves rotor cooling effect.SOLUTION: A rotary electric machine includes: a rotor 4 having a rotational shaft 1 that is arranged horizontally and a rotor main body 3 that is rotatably supported on a case 2 by the rotational shaft 1 and that has a plurality of laminated magnetized steel plates 6a; a stator 5 that is arranged radially outside the rotor 4 and fixed to the case; and a cooling medium supply section 16 that supplies a cooling medium 15 to rotor end faces 9 of the rotor 4 from a position where the cooling medium supply section 16 is fixed to the case.

Description

  The present invention is a rotor having a rotor body that is pivotally supported on a case by a rotating shaft and laminated with a plurality of magnetic steel plates, and is disposed on the radially outer side of the rotor and fixed to the case. The present invention relates to a rotating electrical machine including a stator.

In the rotating electrical machine, an insulating layer such as an enamel coating layer for ensuring insulation between the windings is formed on the surface of the winding forming the stator coil. In addition, in order to ensure the insulation between the coil and the stator core around which the coil is wound and the insulation between the coils of each phase, an insulating paper made of resin or the like is installed between them. is there.
In the conventional rotating electric machine, in order to cool the rotor and the stator, a refrigerant flow path parallel to the axis of the rotation shaft is formed through the rotor body, and the rotor is rotated together with the refrigerant in the refrigerant flow path to rotate the rotor. In addition to cooling, the refrigerant that has flowed out from the refrigerant outlet of the rotor body is discharged outward in the radial direction of the rotor, so that it can be sprayed onto the coils of the stator and the like (for example, Patent Document 1). reference).
Regardless of the rotational speed of the rotor, the refrigerant in the refrigerant passage formed in the rotor body moves in the refrigerant passage at a speed corresponding to the amount of refrigerant supplied to the refrigerant passage, and the refrigerant outlet of the rotor body The refrigerant flowing out of the nozzle is sprayed onto the stator coil and the like by centrifugal force.

JP 2009-71923 A

In the conventional rotating electric machine, in order to rotate the refrigerant in the refrigerant flow path together with the rotor, a part of the rotational energy of the rotor is consumed as energy for rotating the refrigerant in the refrigerant flow path. May decrease.
In addition, since the refrigerant flowing out from the refrigerant outlet of the rotor body easily collides with the insulating layer or the insulating paper at a high speed due to centrifugal force, the insulating layer or the insulating paper may be damaged and the insulation of the stator may be lowered.
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a rotating electrical machine that is less likely to reduce energy efficiency and lower the insulation of the stator and that can easily enhance the cooling effect of the rotor. To do.

  A first characteristic configuration of the rotating electrical machine of the present invention is a rotor having a rotor body that is arranged in a lateral direction, and a rotor body that is pivotally supported on a case by the rotation shaft and in which a plurality of magnetic steel plates are laminated. A stator provided on the outer side in the radial direction of the rotor and fixed to the case, and a refrigerant supply unit that supplies a refrigerant to the rotor end surface of the rotor from a position fixed to the case. is there.

If it is this structure, since a refrigerant | coolant is supplied to the rotating rotor end surface from the position fixed with respect to the case, without rotating a refrigerant | coolant with a rotor, there is little possibility that the energy efficiency of a rotary electric machine falls.
In addition, the coolant that is pivotally supported by the case by a rotating shaft that is disposed laterally and is supplied to the rotating rotor end surface is partially spattered outward in the radial direction of the rotor by centrifugal force. Therefore, the rotor can be cooled by heat exchange between the refrigerant and the rotor end surface while maintaining the contact between the refrigerant and the rotor end surface.
In addition, since the relative speed between the rotating rotor end surface and the refrigerant flowing down along the rotor end surface is large and the refrigerant can pass through the rotor end surface while the temperature does not increase significantly, the temperature difference between the refrigerant and the rotor It is easy to increase the cooling effect by maintaining a large value.
In addition, since the refrigerant is difficult to scatter in the radial direction of the rotor due to centrifugal force, there is little refrigerant that collides with the stator insulation layer and paper at high speed, and the insulation layer and paper are damaged and the stator insulation is damaged. There is little possibility that it will fall.
Therefore, with the rotating electric machine having this configuration, there is little risk of lowering energy efficiency and lowering of the insulating property of the stator, and the cooling effect of the rotor can be easily improved.

  The second characteristic configuration of the present invention is that the rotor end surface is formed of a material having a smaller flow resistance of the refrigerant along the rotor end surface than the surface of the steel plate.

With this configuration, since the refrigerant easily flows along the rotor end surface, the supplied refrigerant is less likely to scatter than when the refrigerant is directly supplied to the surface of the steel plate constituting the rotor. It is easy to spread along the rotor end face.
Therefore, the heat exchange between the refrigerant and the rotor end surface can be promoted in a wide area of the rotor end surface, so that the cooling effect can be further enhanced.

  A third characteristic configuration of the present invention is that the rotor end surface is formed of an end plate that covers the end surface of the rotor main body and has a smooth flat surface.

  With this configuration, by covering the end surface of the rotor body with an end plate having a smooth flat surface, it is possible to provide a rotor end surface that makes it difficult for the supplied refrigerant to scatter and easily spread along the rotor end surface.

  The 4th characteristic structure of this invention exists in the point by which the said end plate is formed by making the said outermost steel plate which comprises the said rotor main body into a steel plate without an opening part.

  If it is this composition, using the outermost steel plate which constitutes a rotor main part, without using a special material, making the steel plate into a steel plate without an opening makes it difficult for the supplied refrigerant to scatter. At the same time, it is possible to provide a rotor end surface that easily expands along the rotor end surface.

  A fifth characteristic configuration of the present invention is that the rotor end surface is formed of a liquid repellent treatment layer obtained by subjecting the end surface of the rotor body to a liquid repellent treatment.

  With this configuration, it is possible to provide a rotor end surface that is difficult for the supplied refrigerant to scatter and easily spread along the rotor end surface without subjecting the steel plate forming the end surface of the rotor body to special machining.

It is a longitudinal cross-sectional view of a rotary electric machine (electric motor). It is a front view which shows the cooling oil supply pipe provided with respect to the rotor end surface. It is a front view which shows the cooling oil supply pipe with which it provided with respect to the rotor end surface in 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 and 2 show an electric motor as an example of a rotating electrical machine according to the present invention mounted on a vehicle or the like.
The electric motor is fixed to the inside of the housing 2 and the rotor 4 having a rotating shaft 1 for power extraction arranged sideways, a rotor body 3 pivotally supported inside the housing (case) 2 by the rotating shaft 1. The stator 5 is provided.

  The rotor body 3 includes a rotor core 7 in which a plurality of magnetic steel plates 6a having magnetism are stacked in the direction of the rotation axis X, and a plurality of permanent magnets 10 attached to the inside of the rotor core 7 at intervals in the circumferential direction of the rotor. Have.

  The rotor 4 includes an end plate 8 that covers both ends of the rotor body 3 in the direction of the rotation axis X and covers the entire surface and has a smooth flat surface. The outward surfaces (smooth flat surfaces) of both end plates 8 form the rotor end surface 9.

  The rotor body 3 is externally fitted and fixed to the rotary shaft 1, and is supported by the rotary shaft 1 via a pair of bearings 11 so as to be rotatable in the direction of the arrow a around the rotation axis X in the lateral direction. ing.

  The stator 5 includes a stator core 12 in which a plurality of electromagnetic steel plates 6 b are stacked in the direction of the rotation axis X, and a stator coil 13 wound around the stator core 12. The stator 5 is fixed to the inside of the housing 2 by disposing the stator core 12 on the radially outer side of the rotor 4 with a slight gap.

  The winding portions of the stator coil 13 at both ends of the stator core 12 are formed as coil ends 14, and when a current is passed through the stator coil 13, a magnetic field that rotates the rotor 4 is generated.

  Inside the housing 2, cooling oil 15 as a coolant is continuously poured and supplied to the upper portion of the rotor end surface 9 from a position fixed to the housing 2 to each of the left and right rotor end surfaces 9. A cooling oil supply unit 16 is provided.

  The left and right rotor end surfaces 9 are formed of a material in which the flow resistance of the cooling oil 15 along the rotor end surface 9 is smaller than the surface of the electromagnetic steel plate 6 a constituting the rotor core 7. Specifically, the end plate 8 is formed by using the outermost electromagnetic steel plate constituting the rotor core 7 as a steel plate 6 c without the opening 10 a for inserting the permanent magnet 10.

The cooling oil supply unit 16 pumps a pair of left and right cooling oil supply pipes 17 for each rotor end surface 9, an oil pan 18 that stores the cooling oil 15 that has flowed down from the rotor end surface 9, and the cooling oil 15 that has accumulated in the oil pan 18. 19 is provided with a cooling oil circulation path 20 that is returned to each cooling oil supply pipe 17.
2 shows the cooling oil supply pipe 17 provided for the left rotor end surface 9 in FIG. 1, and the cooling oil supply pipe 17 provided for the right rotor end surface 9 in FIG. It is arranged.

  As shown in FIG. 2, the pair of left and right cooling oil supply pipes 17 for each rotor end surface 9 has a cooling oil discharge port 17 a of one of the cooling oil supply pipes 17 in the rotational direction a of the rotor 4 rather than a position directly above the rotary shaft 1. A position facing the rotor end surface 9 at a position away from the upper side of the rotor, and a position where the cooling oil discharge port 17b of the other cooling oil supply pipe 17 is further away from the position directly above the rotating shaft 1 toward the lower side of the rotation direction a of the rotor 4 Is fixed to the upper part on the inner side of the housing 2 so as to face the rotor end surface 9.

Therefore, the cooling oil 15 discharged from the cooling oil discharge ports 17 a and 17 b and poured on the upper portion of the rotor end surface 9 is not easily applied to the outer peripheral surface of the rotating shaft 1.
The oil pan 18 is provided on the inner bottom of the housing 2 so as to be at a lower height than the stator 5.

  The flow direction of the cooling oil 15 poured from the cooling oil discharge port 17a arranged on the upper side of the rotation direction a of the rotor 4 of the left and right cooling oil discharge ports 17a and 17b is opposed to the rotation direction a of the rotor 4. Therefore, the cooling oil 15 is less likely to flow down toward the lower side of the rotor 4 than the cooling oil 15 poured from the cooling oil discharge port 17b disposed on the lower side of the rotation direction a of the rotor 4.

  For this reason, from the cooling oil discharge port 17a, the cooling oil 15 poured from the cooling oil discharge port 17a arranged on the upper side of the rotation direction a of the rotor 4 is likely to flow down toward the lower side of the rotor 4. The discharge amount of the cooling oil 15 may be larger than the discharge amount of the cooling oil 15 from the cooling oil discharge port 17b disposed on the lower side in the rotation direction a of the rotor 4.

[Second Embodiment]
FIG. 3 shows another embodiment of the rotating electrical machine according to the present invention.
In this embodiment, the cooling oil supply part 16 provided with the one cooling oil supply pipe 17 for each rotor end surface 9 is provided.
The cooling oil supply pipe 17 has its cooling oil discharge port 17 a opposed to the rotor end surface 9 at a position immediately above the rotary shaft 1.
Other configurations are the same as those of the first embodiment.

[Third Embodiment]
Although not shown, in order to form the rotor end surface 9 with a material in which the flow resistance of the cooling oil 15 along the rotor end surface 9 is smaller than the surface of the electromagnetic steel plate 6 a constituting the rotor core 7, the rotor end surface 9 is the rotor core 7 or the rotor. The end surface of the main body 3 may be formed of an oil repellent treatment layer (fluorine resin coating) that has been subjected to an oil repellent treatment by applying a fluororesin or the like.

[Other Embodiments]
1. The rotating electrical machine according to the present invention may be a generator, a motor generator that functions as an electric motor, or a generator in addition to the electric motor.
2. The rotating electrical machine according to the present invention may be provided with cooling oil cooling means including a cooling heat exchanger or the like in the middle of the cooling oil circulation path.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Case 3 Rotor main body 4 Rotor 5 Stator 6a Steel plate 6c Steel plate 8 End plate 9 Rotor end surface 10a Opening part 15 Refrigerant 16 Refrigerant supply part

Claims (5)

A rotor having a rotor main body in which a plurality of steel plates each having a rotating shaft arranged in a lateral direction and a magnetic shaft supported by the rotating shaft and laminated with magnetism are laminated;
A stator disposed radially outside the rotor, and fixed to the case;
A rotating electrical machine comprising: a refrigerant supply unit that supplies a refrigerant to a rotor end surface of the rotor from a position fixed to the case.   The rotating electrical machine according to claim 1, wherein the rotor end surface is formed of a material having a flow resistance of the refrigerant along the rotor end surface smaller than that of the steel plate.   The rotating electrical machine according to claim 2, wherein the rotor end surface is formed of an end plate that covers the end surface of the rotor body and has a smooth flat surface.   The rotating electric machine according to claim 3, wherein the end plate is formed by using the outermost steel plate constituting the rotor body as a steel plate having no opening.   The rotating electrical machine according to claim 2, wherein the rotor end surface is formed of a liquid repellent treatment layer obtained by subjecting the end surface of the rotor body to a liquid repellent treatment.

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