JP2004072812A - Dynamo electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo electric machine which can cool a coil by suppressing the widening of a coil with a simple structure. <P>SOLUTION: This dynamo electric machine is provided with an annular pipe 7a such that it contacts with the periphery side of a coil end 4a at the end of a coil 4 arranged within a frame 5. Further, the annular pipe 7a is provided with a plurality of jets 7d, cooling oil 8 is made to flow to the annular pipe 7a, and the cooling oil 8 is jetted out toward the coil end 4a from the jet 7d. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating electric machine such as an electric motor or a dynamometer.
[0002]
[Prior art]
A coil provided on a stator of a rotating electric machine such as an electric motor or a dynamometer generates heat due to loss of current flowing through the coil. Heat generated from the coil is a main heat source in the rotating electric machine, and it is necessary to lower the temperature of the coil in order to further reduce the size of the rotating electric machine. Therefore, cooling of the coil is performed by various methods. For example, Japanese Utility Model Laid-Open No. 7-27270 describes a liquid cooling type cooling structure in which the coil is cooled by sprayed cooling oil.
[0003]
In addition, in order to ensure the miniaturization of the rotating electric machine, there has been devised to suppress deformation of the coil during energization, in particular, expansion of the coil end (end of the coil).
[0004]
FIG. 3 is a sectional view of a conventional electric motor.
In FIG. 3, parts necessary for explanation are shown, and other parts are omitted.
[0005]
As shown in FIG. 3, a conventional electric motor includes a shaft 1 serving as a rotating shaft, a rotor (rotor) 2 coaxially supported by the shaft 1, and an appropriate distance from the rotor 2. A frame 5 having a tubular stator (stator) 3 disposed therein and a coil 4 wound in the longitudinal direction of the stator 3 and disposed inside the stator 3, and serving as a housing of the electric motor. The inside of the frame 5 supports the stator 3, and brackets 6 provided at both ends of the frame 5 support the shaft 1 together with a bearing (not shown) and the like.
[0006]
Although only one coil 4 is shown in FIG. 3, a plurality of coils 4 are actually arranged in an annular shape at appropriate intervals inside the stator 3. A ring 9 is provided so as to be in contact with the outer peripheral side of the coil end 4a at the end of the coil 4. That is, the plurality of coils 4 arranged in an annular shape are restrained by the ring 9 which is in contact with the outer peripheral side. With this configuration, the ring 9 can be prevented from spreading outside the coil end 4a due to heat generation or the like at the time of energization, thereby contributing to downsizing of the electric motor. Although not shown, the ring 9 is supported by a support member provided on the frame 5 and the like, and is fixed so as not to move.
[0007]
[Problems to be solved by the invention]
In order to reduce the size of the rotating electric machine, it is necessary to cool the inside of the rotating electric machine, particularly, the coil which is a main heat source. Further, in order to ensure the miniaturization of the rotating electric machine, a ring or the like for suppressing the spread of the coil is required.
[0008]
However, simply combining the cooling structure by spraying the cooling oil as described above with a ring or the like for suppressing the spread of the coil may complicate the structure and increase the cost.
[0009]
The present invention has been made in view of the above problems, and has as its object to provide a rotating electric machine having a simple structure, capable of suppressing the spread of a coil and cooling the coil.
[0010]
[Means for Solving the Problems]
The rotating electric machine according to claim 1 of the present invention that solves the above-described problem is provided with a ring-shaped pipe so as to be in contact with an outer peripheral side of an end of a coil disposed inside a housing, and the ring-shaped pipe is It is characterized by flowing a refrigerant.
[0011]
In the above invention, the ring-shaped pipe in contact with the outer peripheral side of the end portion of the coil plays a role of suppressing the spread of the coil, and also plays a role of a cooling pipe that cools the refrigerant by flowing through the pipe.
[0012]
A rotary electric machine according to a second aspect of the present invention that solves the above-mentioned problem is characterized in that a plurality of ejection ports are provided in the ring-shaped pipe so as to eject the refrigerant toward the coil.
[0013]
In the above invention, the coil can be directly cooled by the refrigerant by directly spraying the refrigerant onto the coil.
[0014]
A rotating electric machine according to a third aspect of the present invention that solves the above-mentioned problem is characterized in that the refrigerant is a cooling oil.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a sectional view of a rotating electric machine showing an example of an embodiment of the present invention.
FIG. 1 shows a portion according to the present invention, and other portions are omitted.
[0016]
As shown in FIG. 1, the electric motor according to the present invention includes a shaft 1 serving as a rotating shaft, a rotor (rotor) 2 coaxially supported by the shaft 1, and an appropriate distance from the rotor 2. It has a cylindrical stator (stator) 3 disposed around the periphery and a coil 4 wound in the longitudinal direction of the stator 3 and disposed inside the stator 3, and forms a housing of the electric motor. The stator 3 is supported inside the frame 5, and the shaft 1 is supported by brackets 6 provided at both ends of the frame 5 together with a bearing (not shown) and the like.
[0017]
Although only one coil 4 is shown in FIG. 1, a plurality of coils 4 are actually arranged in an annular shape at appropriate intervals inside the stator 3. A ring-shaped pipe portion 7a is provided so as to be in contact with the outer peripheral side of the coil end 4a at the end of the coil 4. That is, the plurality of coils 4 arranged in an annular shape are restrained by the ring-shaped pipe portion 7a that is in contact with the outer peripheral side. With this configuration, the ring-shaped pipe portion 7a can be prevented from spreading outside the coil end 4a due to heat generation at the time of energization, thereby contributing to downsizing of the motor.
[0018]
Further, the electric motor according to the present invention includes a supply pipe 7b provided to penetrate the frame 5 as a housing, and the cooling oil 8 serving as a refrigerant is supplied to the supply pipe 7b. The ring-shaped pipe portion 7a and the supply pipe 7b are connected to each other and communicate with each other, and the ring-shaped pipe portion 7a is provided with a plurality of ejection ports 7d (for details, see FIG. 2 described later). . Therefore, the cooling oil 8 supplied to the supply pipe 7b flows through the ring-shaped pipe portion 7a and is ejected from the ejection port 7d.
[0019]
Because of the above structure, the cooling oil 8 flows through the ring-shaped pipe portion 7a to cool the pipe portion 7a, thereby cooling the coil end 4a in contact with the pipe portion 7a. Further, the cooling oil 8 jetted from the jet port 7d of the pipe portion 7a directly removes heat from the coil end 4a by directly touching the coil end 4a, so that the coil end 4a can be further cooled.
[0020]
That is, in the present invention, the expansion of the coil end 4a can be mechanically restrained and suppressed by the ring-shaped pipe 7a, and the pipe 7a itself cooled by the cooling oil 8 and the outlet 7d of the pipe 7a With the cooling oil 8 jetted from the coil end, the coil end 4a can be directly cooled. Direct cooling of a coil having a particularly large amount of heat inside the motor not only suppresses the temperature rise of the coil, but also suppresses the spread of the coil end 4a due to the heat generation, and the coil end 4a associated with the spread of the coil end 4a. Also, the force (thermal stress) applied to the pipe 7a can be reduced.
[0021]
Although not shown, the motor has a discharge port for discharging the jetted cooling oil 8. The cooling oil 8 discharged from the outlet may be cooled by a heat exchanger or the like, and may be supplied to the electric motor again as the cooling oil 8.
[0022]
2A and 2B show a ring-shaped pipe of a rotary electric machine as an example of an embodiment of the present invention, wherein FIG. 2A is an overall view, and FIG. 2B is a cross-sectional view taken along line AA of FIG.
[0023]
As shown in FIG. 2A, the ring-shaped pipe 7 has a ring-shaped pipe 7a having an inner diameter in contact with an outer peripheral side of an end portion (coil end) of a coil of the electric motor, and a cooling oil 8 provided in the pipe 7a. It has a supply pipe 7b for supplying and a connection part 7c for connecting the supply pipe 7a and the pipe part 7b. The supply pipe 7a and the pipe section 7b are connected to each other and communicate with each other by the connection section 7c. Further, a plurality of ejection ports 7d are provided in the circumferential direction of the pipe portion 7a, and the cooling oil 8 supplied from the supply pipe 7a to the pipe 7a is ejected from the ejection ports 7d to the coil ends, and a coil end is formed. Cooling the end.
[0024]
Further, as shown in FIG. 2B, in a cross section perpendicular to the circumferential direction of the pipe portion 7a, the two ejection ports 7d are provided at opposing positions. This is a direction substantially along the longitudinal direction of the coil, and is arranged so as to be efficiently sprayed directly on the coil end.
[0025]
Note that the present invention is not limited to only those shown in the drawings. For example, the ring-shaped pipe 7 may be appropriately changed as long as it has a function equivalent to this. Also, the number, size, direction, etc. of the injection ports 7d of the ring-shaped pipe 7 may be appropriately changed as long as the coil ends can be appropriately cooled.
[0026]
【The invention's effect】
According to the first or third aspect of the invention, a ring-shaped pipe is provided so as to be in contact with the outer peripheral side of the end of the coil disposed inside the housing, and the refrigerant flows through the ring-shaped pipe. Since the rotating electric machine is configured as described above, the ring-shaped pipe in contact with the outer peripheral side of the end of the coil plays a role in suppressing the spread of the coil, and also plays a role of a cooling pipe that cools with the refrigerant flowing in the pipe, By sharing parts, the number of parts can be reduced. Therefore, a simple structure can be achieved, which can contribute to downsizing of the rotating electric machine.
[0027]
According to the invention according to claim 2 or 3, since a plurality of ejection ports are provided in the ring-shaped pipe so as to eject the refrigerant toward the coil, the cooling oil is directly applied to the coil. The cooling performance can be further improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a rotating electric machine showing an example of an embodiment of the present invention.
2A and 2B show a ring-shaped pipe of a rotary electric machine as an example of an embodiment of the present invention, wherein FIG. 2A is an overall view, and FIG. 2B is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view of a conventional rotating electric machine.
[Explanation of symbols]
1 shaft 2 rotor
3 Stator (stator)
4 Coil 4a Coil end 5 Frame 6 Bracket 7 Ring-shaped pipe 7a Pipe 7b Supply pipe 7c Connection 7d Spout 8 Cooling oil

Claims (3)

A rotating electric machine, wherein a ring-shaped pipe is provided so as to be in contact with an outer peripheral side of an end of a coil disposed inside a housing, and a refrigerant flows through the ring-shaped pipe. The rotating electric machine according to claim 1,
A rotating electric machine, wherein a plurality of ejection ports are provided in the ring-shaped pipe so as to eject the refrigerant toward the coil. In the rotating electric machine according to claim 1 or 2,
A rotating electric machine, wherein the refrigerant is a cooling oil.

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