Motor

Abstract

The invention relates to a motor. The motor is provided with a cylindrical housing for accommodating a stator and a rotor, and a first cover for closing an opening of the housing. The housing is provided with a refrigerant flow path. First holes that communicate the inside and outside of the refrigerant flow path are provided in the upper and lower portions of the first cover, respectively.

Description

Technical Field

[0001] The present disclosure relates to motors. Background Art

[0002] The motor has a refrigerant flow path for cooling the coil of the stator. In the motor of Japanese Patent Laid-Open No. 11-341744, a refrigerant flow path is provided in a housing that accommodates a rotor and a stator. An exhaust hole for removing air bubbles in the refrigerant flow path is provided in the housing. Sometimes a hole (drain hole) for extracting refrigerant from the refrigerant flow path is also provided in the housing. Summary of the invention

[0003] Stators of different lengths require housings of different lengths. If air extraction holes and exhaust holes are provided in housings of different lengths, the structure of the housing becomes complicated. The present invention provides a motor having a housing with air extraction holes and exhaust holes and having a simple structure.

[0004] A motor involved in a technical solution of the present disclosure comprises: a cylindrical shell that accommodates a stator and a rotor; and a first cover that blocks the opening of the shell. A refrigerant flow path is provided in the shell. A first hole that connects the inside and outside of the refrigerant flow path is provided at the upper part and the lower part of the first cover, respectively. The motor disclosed in the present disclosure is provided with two first holes (an exhaust hole and a discharge hole) in the first cover. Therefore, the structure of the shell becomes simple. In addition, a common first cover having an exhaust hole and a discharge hole can be applied to shells of different lengths. Since a common first cover can be applied to shells of different lengths, the design freedom of the motor can be improved.

[0005] In the motor, a second hole for communicating the inside and outside of the refrigerant flow path may be provided in one of the housing and the first cover.

[0006] In the above motor, the second hole may be provided in the first cover.

[0007] In addition, one of the two first holes (the exhaust hole and the discharge hole) may also serve as a refrigerant supply port. The other of the two first holes may also serve as a refrigerant discharge port. In addition to the two first holes, two second holes (the refrigerant supply port and the refrigerant discharge port) may also be provided.

[0008] In the above motor, the second hole may be located between the two first holes in the up-down direction.

[0009] In the above motor, a bolt for fixing the component to the above first cover may block one of the above first holes.

[0010] In the motor, the housing may have a first opening and a second opening. The first cover may close the first opening. The motor may include a second cover that closes the second opening of the housing.

[0011] In the above motor, the two first holes may be arranged so as to sandwich the axis line of the housing.

[0012] In the above motor, a diameter of the first hole may be smaller than a diameter of the second hole.

[0013] The details and further improvements of the present disclosure will be described in the following “Specific Implementation Methods”. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which like reference numerals represent like elements, wherein:

[0015] Figure 1 This is a rear view of the motor of the first embodiment.

[0016] Figure 2 So Figure 1 This is a cross-sectional view of the motor cut along line II-II.

[0017] Figure 3 So Figure 1 This is a cross-sectional view of the motor taken along line III-III.

[0018] Figure 4 It is a cross-sectional view of the motor of the second embodiment. DETAILED DESCRIPTION

[0019] First Embodiment

[0020] Reference Figure 1 to Figure 3 , the motor 2 of the first embodiment is described. Figure 1 It is a rear view of the motor 2. Figure 2 So Figure 1 A cross-sectional view of the motor 2 cut along the II-II line. The motor 2 includes a rotor 3, a stator 4, a housing 20, and a pair of covers 10 and 30. The cover 10 corresponds to the first cover. The cover 30 corresponds to the second cover. The rotor 3 and the stator 4 are accommodated in the cylindrical housing 20. Both ends of the housing 20 in the direction of the axis Ax are open. One opening (the first opening) of the housing 20 is blocked by the cover 10. The cover 10 is fixed to the housing 20 with a plurality of bolts 51. The other opening (the second opening) of the housing 20 is blocked by the cover 30. The cover 30 is fixed to the housing 20 with a plurality of bolts 52. In order to distinguish between the cover 10 and the cover 30, the cover 30 may also be referred to as "the other cover". The stator 4 is fixed in the housing 20. The rotor 3 is rotatably supported by the bearings provided in the covers 10 and 30.

[0021] During the operation of the motor 2, a high voltage current flows through the coil 5 of the stator 4, so that the coil 5 generates heat. In order to cool the coil 5, a refrigerant flow path 21 is provided in the housing 20. Liquid refrigerant flows in the refrigerant flow path 21 to cool the coil 5. More specifically, cooling water flows in the refrigerant flow path 21.

[0022] The structure of the refrigerant flow path 21 will be described. A straight flow path 22 is provided inside the side wall of the housing 20. Figure 3 Shown in Figure 1 A cross-sectional view of the motor 2 taken along line III-III. Figure 3 The cross section of the side wall of the shell 20 cut along the circumferential direction is shown. A plurality of straight flow paths 22 parallel to the axis Ax are provided on the side wall of the shell 20. One ends of adjacent straight flow paths 22 are connected by a U-shaped flow path 12 provided on the cover 10. The other ends of adjacent straight flow paths 22 are connected by a U-shaped flow path 32 provided on the cover 30. The U-shaped flow paths 12 and the U-shaped flow paths 32 alternately connect adjacent straight flow paths 22, and the U-shaped flow paths 12, 32 and the straight flow paths 22 constitute one refrigerant flow path 21.

[0023] The cover 10 is provided with two holes (exhaust hole 13, discharge hole 14) corresponding to the first hole, and two other holes (refrigerant supply port 18, refrigerant discharge port 19) corresponding to the second hole. The four holes in total and the other holes all connect the inside and outside of the refrigerant flow path 21. The refrigerant supply port 18 and the refrigerant discharge port 19 are connected to a refrigerant circulation device not shown. Liquid cold refrigerant is supplied to the refrigerant flow path 21 from the refrigerant circulation device. The refrigerant flowing in the refrigerant flow path 21 cools the coil 5. The refrigerant that has absorbed heat from the coil 5 comes out from the refrigerant discharge port 19 and returns to the refrigerant circulation device.

[0024] The air extraction hole 13 is usually closed by a bolt 53. The discharge hole 14 is usually closed by a bolt 54. The motor 2 is configured such that the air extraction hole 13 is located at the vertical upper part of the cover 10, and the discharge hole 14 is located at the vertical lower part of the cover 10. In other words, the air extraction hole 13 is located at the upper part of the cover 10, and the discharge hole 14 is located at the lower part of the cover 10.

[0025] When the motor 2 is stopped to replace the refrigerant, the exhaust hole 13 and the discharge hole 14 are opened. First, the discharge hole 14 is opened to release the old refrigerant from the refrigerant flow path 21. The discharge hole 14 is closed with the bolt 54, and the exhaust hole 13 is opened. Refrigerant is injected into the refrigerant flow path 21 through the exhaust hole 13. While the refrigerant gradually fills the refrigerant flow path 21, the air in the refrigerant flow path 21 is discharged to the outside from the exhaust hole 13. At this time, the bubbles contained in the refrigerant are also discharged from the exhausted hole 13. If the exhaust hole 13 is closed with the bolt 53, the preparation for driving the motor 2 is completed.

[0026] exist Figure 3 In FIG. 1 , reference symbol T indicates the vertical upper position of the motor 2, and reference symbol B indicates the vertical lower position of the motor 2. Figure 3 , the air extraction hole 13 is located at the vertical upper part of the cover 10, and the discharge hole 14 is located at the vertical lower part of the cover 10. The refrigerant supply port 18 and the refrigerant discharge port 19 are located between the air extraction hole 13 and the discharge hole 14 in the vertical direction.

[0027] Second Embodiment

[0028] exist Figure 4 2 is a cross-sectional view of a motor 102 according to the second embodiment. Figure 4 is with Figure 2 In the motor 102, the bolt 53 that closes the air exhaust hole 13 fixes the cable bracket 103 to the cover 10. The cable bracket 103 supports the power cable 104 for supplying the three-phase AC current to the coil 5 of the stator 4. The structure of the motor 102 is the same as that of the motor 2 except that the cable bracket 103 is provided.

[0029] Several features and effects of the motor 2, 102 described in the embodiment are listed. An air extraction hole 13 is provided at the upper part of the cover 10 in the vertical direction, and a discharge hole 14 is provided at the lower part in the vertical direction. In other words, the air extraction hole 13 and the discharge hole 14 are arranged in a manner of sandwiching the axis Ax. In addition to the air extraction hole 13 and the discharge hole 14, the cover 10 is also provided with other holes (refrigerant supply port 18 and refrigerant discharge port 19) that connect the inside and outside of the refrigerant flow path 21. The diameters of the air extraction hole 13 and the discharge hole 14 are smaller than the diameters of the refrigerant supply port 18 and the refrigerant discharge port 19. Both the two holes (air extraction hole 13, discharge hole 14) and the two other holes (refrigerant supply port 18, refrigerant discharge port 19) connect the inside and outside of the refrigerant flow path 21. The other holes (refrigerant supply port 18 and refrigerant discharge port 19) are located between the air extraction hole 13 and the discharge hole 14 in the up and down direction (vertical direction).

[0030] No hole is provided in the cylindrical housing 20 of the motor 2, 102. The structure of the housing 20 becomes simple. Different housings 20 can be prepared according to the length of the stator 4. A common cover 10 can be used for housings 20 of different lengths. Since the cover 10 can be made common for housings 20 of different lengths, the degree of freedom in design of the motors 2, 102 can be increased.

[0031] By providing two holes (the suction hole 13 and the discharge hole 14) and two other holes (the refrigerant supply port 18 and the refrigerant discharge port 19) in the cover 10, the freedom of the arrangement positions of the refrigerant supply port 18 and the refrigerant discharge port 19 increases.

[0032] In the motor 102 of the second embodiment, the bolts 53 fixing the motor component (cable bracket 103) to the cover 10 block the air extraction hole 13. The bolts 53 blocking the air extraction hole 13 also serve as bolts for fixing the component. This structure contributes to a reduction in the number of components of the motor 102.

[0033] Points to note regarding the technology described in the embodiment are described. The discharge hole 14 may also serve as the refrigerant supply port 18, and the exhaust hole 13 may also serve as the refrigerant exhaust port 19. That is, there may be only two holes provided in the cover 10. In this case, the two holes are not closed. The refrigerant enters the refrigerant flow path 21 from the refrigerant supply port 18 (discharge hole 14) at the lower part, and comes out from the refrigerant exhaust port 19 (exhaust hole 13) at the upper part. The bubbles contained in the refrigerant naturally come out from the refrigerant exhaust port 19 (exhaust hole 13) as the refrigerant flows.

[0034] One of the air extraction hole 13 and the discharge hole 14 may also serve as the refrigerant supply port 18. One of the air extraction hole 13 and the discharge hole 14 may also serve as the refrigerant discharge port 19.

[0035] The refrigerant supply port 18 and the refrigerant discharge port 19 may also be provided in another cover 30 or the housing 20. However, it is preferred that the refrigerant supply port 18 and the refrigerant discharge port 19 are provided in the cover 10 together with the air extraction hole 13 and the discharge hole 14. By providing four holes in one cover 10, the structure of the housing 20 and the other cover 30 can be simplified.

[0036] The cover 10 blocks one opening of the cylindrical shell 20. The other opening of the shell 20 is blocked by another cover 30. The shell 20 may also be a bottomed cylindrical shell. In this case, the motor has only one cover 10. The motor 2, 102 of the embodiment has a refrigerant flow path 21 composed of a plurality of straight flow paths 22 and a plurality of U-shaped flow paths 12, 32. The refrigerant flow path 21 only needs to be provided in the wall of the shell 20, and its shape may be arbitrary.

[0037] The bolt 54 that closes the drain hole 14 may also fix a component of the motor. The bolts 53 and 54 may also fix a component other than the cable bracket 103 to the cover 30 .

[0038] The specific examples disclosed herein are described in detail above, but these are merely examples and do not limit the technical solution. The technology described in the technical solution includes various deformations and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exert their technical usefulness alone or through various combinations, and are not limited to the combinations recorded in the technical solution at the time of application. In addition, the technology illustrated in this specification or the drawings can achieve multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

Claims

1. A motor, characterized in that: have: A cylindrical housing containing the stator and the rotor; and a first cover, blocking the opening of the housing, A refrigerant flow path is provided in the shell. The first cover is provided with first holes in the upper portion and the lower portion, respectively, for communicating the inside and the outside of the refrigerant flow path.

2. The motor according to claim 1, characterized in that A second hole that communicates the inside and outside of the refrigerant flow path is provided in one of the housing and the first cover.

3. The motor according to claim 2, characterized in that The second hole is provided in the first cover.

4. The motor according to claim 3, characterized in that The second hole is located between the two first holes in the up-down direction.

5. The motor according to claim 1, characterized in that The first hole is closed by a bolt that fixes the component to the first cover.

6. The motor according to claim 1, characterized in that The housing has a first opening and a second opening, The first cover blocks the first opening, The motor includes a second cover that closes the second opening of the housing.

7. The motor according to claim 1, characterized in that The two first holes are arranged so as to sandwich the axis of the housing.

8. The motor according to claim 2, characterized in that The diameter of the first hole is smaller than the diameter of the second hole.

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