JP2006296005A - Liquid-cooled motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a refrigerant passage of a liquid cooling motor with a simple structure having a small number of parts.
A motor case is formed by fitting a bottomed cylindrical motor cover 16 with a gap between the outer periphery of a bottomed cylindrical stator holder 15 that supports a stator on the inner periphery. The first and second refrigerant passage constituting members 28 and 29 are arranged between the motor cover 16 to form a refrigerant passage through which the refrigerant flows, and an O-ring 17 is formed between the opening of the stator holder 15 and the opening of the motor cover 16. Pinch. A refrigerant case with a small number of seals can be formed while forming a motor case using the stator holder 15 and the motor cover 16 having a simple number of parts and a simple shape, and the stator holder 15 has a bottomed cylindrical shape. Since there is only one opening, the possibility of refrigerant leaking into the stator holder 15 can be kept low.
[Selection] Figure 2

Description

  The present invention relates to a liquid cooling motor including a refrigerant passage through which a refrigerant flows inside a case body of a motor case.

  A water cooling chamber casing 7 formed by welding stainless steel inner and outer cylinders 8 and 9 to the outer periphery of the stator casing 1 of the water cooling motor is fitted, and cooling water is placed inside the water cooling chamber casing 7. Patent Document 1 below discloses that the stator housing 1 is cooled by supplying

  Further, flanges 3 and 4 are welded to both ends of the motor frame 1 that supports the stator 2 on the inner peripheral surface and both ends of the jacket 5 that is fitted with a gap on the outside of the motor frame 1, respectively. A water cooling chamber in which cooling water flows is known from Patent Document 2 below.

A plurality of grooves extending in the circumferential direction are provided in the outer peripheral surface of the bracket 1 that supports the stator 7 on the inner peripheral surface, and the grooves 1 are covered with the outer peripheral surface of the bracket 1 constituting the water channel. Patent Document 3 below is known in which both ends of the sleeve 3 are sealed with a pair of O-rings 5 and 5.
Utility Model Registration No. 2586831 Japanese Patent No. 2617849 Japanese Patent No. 3499745

  By the way, what was described in the above-mentioned patent document 1 is that the water cooling chamber casing 7 is constituted by a separate member independent of the stator casing 1 of the motor. Since the heat of No. 1 is difficult to be transmitted to the water cooling chamber casing 7, the cooling efficiency may be reduced.

  Moreover, since the both ends of the motor frame 1 and the jacket 5 are welded to the flanges 3 and 4, respectively, the problem described in Patent Document 2 has a problem that the number of welding points increases and the manufacturing cost increases.

  In addition, what is described in Patent Document 3 described above is that not only the number of sealing members is increased because both ends of the sleeve 3 fitted to the outer peripheral surface of the bracket 1 are sealed with a pair of O-rings 5, 5. If the cooling water channel having the shape is formed, there is a problem that the shape of the bracket 1 becomes complicated and the manufacturing cost increases.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to configure a refrigerant passage of a liquid-cooled motor with a simple structure with a small number of parts.

  In order to achieve the above object, according to the invention described in claim 1, in a liquid-cooled motor including a refrigerant passage through which a refrigerant flows inside the case main body of the motor case, the case main body is arranged on the inner periphery. A bottomed cylindrical stator holder that supports the stator, and a bottomed cylindrical motor cover that fits with a gap around the outer periphery of the stator holder, and the refrigerant is interposed between the stator holder and the motor cover. A liquid-cooled motor characterized by forming a passage is proposed.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, a sealing member is sandwiched between the opening of the stator holder and the opening of the motor cover. A cold motor is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the liquid-cooled type wherein the opening of the stator holder and the opening of the motor cover are welded in a liquid-tight manner. A motor is proposed.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the refrigerant passage that divides the refrigerant passage between the stator holder and the motor cover. A liquid-cooled motor is proposed, in which the constituent members are arranged.

  The O-ring 17 of the embodiment corresponds to the seal member of the present invention, and the first and second refrigerant passage constituting members 28 and 29 of the embodiment correspond to the refrigerant passage constituting member of the present invention. The second refrigerant passages 30 and 31 correspond to the refrigerant passages of the present invention.

  According to the configuration of the first aspect, the motor case is configured by fitting the bottomed cylindrical motor cover with the gap on the outer periphery of the bottomed cylindrical stator holder that supports the stator on the inner periphery. Since the refrigerant passage through which the refrigerant flows is formed between the holder and the motor cover, the refrigerant passage can be configured with a small number of parts and with a simple shape using the stator holder and the motor cover having a simple shape, and the stator holder. Since it has a bottomed cylindrical shape and has only one opening, the possibility of refrigerant leaking into the stator holder can be kept low.

  According to the configuration of the second aspect, since the seal member is sandwiched between the opening of the stator holder and the opening of the motor cover, leakage of the refrigerant from the refrigerant passage can be prevented with the minimum number of seal members. .

  According to the configuration of the third aspect, since the opening of the stator holder and the opening of the motor cover are liquid-tightly welded, it is possible to prevent leakage of the refrigerant from the refrigerant passage without requiring a special seal member. it can.

  According to the configuration of the fourth aspect, since the refrigerant passage constituting member that divides the refrigerant passage is disposed between the stator holder and the motor cover, any structure can be used with a simple structure without changing the shape of the stator holder or the motor cover. The cooling passage of the shape can be formed to increase the cooling efficiency of the motor.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a liquid-cooled motor, FIG. 2 is an exploded perspective view of a motor case, and FIG. 3 is a line 3-3 in FIG. 4 is a sectional view taken along line 4-4 of FIG. 1, and FIG. 5 is a schematic view of a refrigerant passage.

  As shown in FIGS. 1 and 2, the motor case 11 of the liquid-cooled DC brushless motor M is configured by fastening a case body 12 and a cover plate 13 with a plurality of bolts 14. The case body 12 is obtained by fitting a bottomed cylindrical motor cover 16 to the outer periphery of a bottomed cylindrical stator holder 15, and a projecting portion 15 a projecting in the direction of the axis L from the bottom wall of the stator holder 15 and the motor cover. The projecting portion 16a projecting in the direction of the axis L from the bottom wall 16 is in contact with the annular contact portion t1, and the opening portion 15b of the stator holder 15 and the opening portion 16b of the motor cover 16 are in contact with the annular contact portion t2. Then, the bolts 14 in a state where the flanges 15c and 16c extending in the radial direction from the opening 15b of the stator holder 15 and the opening 16b of the motor cover 16 are overlapped with each other while being positioned in the axis L direction and the radial direction. Are fastened together with the cover plate 13. At this time, the O-ring 17 is sandwiched between the opening 15 b of the stator holder 15 and the opening 16 b of the motor cover 16.

  Both ends of the motor shaft 20 are rotatably supported by a ball bearing 18 provided on the protrusion 15 a of the stator holder 15 and a ball bearing 19 provided on the opening 13 a of the cover plate 13. The rotor 21 splined to the central portion of the motor shaft 20 includes a core 22 made of laminated steel plates and a plurality of magnets 23 fixed to the outer periphery of the core 22. An annular stator 24 that is opposed to the outer periphery of the rotor 21 via an air gap is fixed to the inner periphery of the stator holder 15, and the stator 24 is arranged on the outer periphery of a plurality of cores 25 made of laminated steel plates. It is configured by winding. A resolver 27 that detects the rotational phase of the rotor 20 is provided between the motor shaft 19 and the cover plate 13 in order to control the phases of the U-phase, V-phase, and W-phase currents supplied to the coils 26.

  3 and 4 together, a cylindrical space is formed between the outer peripheral surface of the cylindrical portion 15d of the stator holder 15 and the inner peripheral surface of the cylindrical portion 16d of the motor cover 16. The first and second refrigerant passage constituting members 28 and 29 having a half-cylindrical shape are disposed there. On the inner peripheral surface of the first refrigerant passage constituting member 28, first to third partition walls 28a to 28c extending in the circumferential direction and a fourth partition wall 28d extending in the axis L direction at one end in the circumferential direction are formed. On the inner peripheral surface of the two refrigerant passage constituting member 29, there are formed first to third partition walls 29a to 29c extending in the circumferential direction, and an inlet hole 29d and an outlet hole 29e opened at one end in the circumferential direction.

  In order to position the first and second refrigerant passage constituting members 28 and 29 with respect to each other, two end portions of the second refrigerant passage constituting member 29 are formed in two recesses 28e formed at both ends of the first refrigerant passage constituting member 28, respectively. The two convex portions 29f formed respectively engage with each other. Further, in order to position the first and second refrigerant passage constituting members 28 and 29 with respect to the stator holder 15, notches 28 f and 28 f respectively formed in the first and third partition walls 28 a and 28 c of the first refrigerant passage constituting member 28 are provided. The notches 29g and 29g formed in the first and third partition walls 29a and 29c of the second refrigerant passage constituting member 29 are engaged with the positioning protrusions 15e and 15e (see FIG. 4) formed on the stator holder 15, respectively. 15 is engaged with positioning protrusions 15f and 15f formed on the surface.

  The motor cover 16 is provided with an inlet joint 16e and an outlet joint 16f, and the inlet joint 16e and the outlet joint 16f communicate with the inlet hole 29d and the outlet hole 29e of the second refrigerant passage constituting member 29.

  When the stator 24 of the motor M having the above configuration generates heat by energizing the coils 26, the motor case 11 that supports the stator 24 on the inner periphery becomes high temperature, so the stator holder 15 and the motor cover 16 of the case body 12 are heated. A coolant such as water is supplied to the first and second coolant passages 30 and 31 (see FIG. 5) formed therebetween to cool them. The first and second refrigerant passages 30 and 31 surrounding the axis L over approximately 360 ° are defined between the inner peripheral surfaces of the first and second refrigerant passage constituting members 28 and 29 and the outer peripheral surface of the stator holder 15. Thus, the refrigerant that has passed through the inlet hole 29d of the second refrigerant passage constituting member 29 from the inlet joint 16e substantially passes through the first refrigerant passage 30 sandwiched between the first partition walls 28a and 29a and the second partition walls 28b and 29b. It flows in one direction over 360 °, hits the fourth partition wall 28d, makes a U-turn, and travels in the second refrigerant passage 31 sandwiched between the third partition walls 28c, 29c and the second partition walls 28b, 29b over approximately 360 °. Then, it flows in the other direction, passes through the outlet hole 29e of the second refrigerant passage constituting member 29, and flows out from the outlet joint 16f.

  As described above, the motor case 11 is configured by fitting the bottomed cylindrical motor cover 16 to the outer periphery of the bottomed cylindrical stator holder 15, while minimizing the number of parts and the stator holder 15 and The first and second refrigerant passages 30 and 31 can be formed between the stator holder 15 and the motor cover 16 without complicating the shape of the motor cover 16. In particular, since the stator holder 15 and the motor cover 16 can be manufactured by press-molding a metal plate, the manufacturing cost can be kept low.

  Further, since the stator holder 15 and the motor cover 16 are cylindrical with a bottom and each has only one opening 15b, 16b, leakage of the refrigerant from the motor case 11 can be ensured only by sealing with one O-ring 17. In addition, the possibility of refrigerant flowing into the stator holder 15 can be kept low.

  Further, since the first and second refrigerant passage constituting members 28 and 29 for dividing the first and second refrigerant passages 30 and 31 are arranged between the stator holder 15 and the motor cover 16, the stator holder 15 and the motor cover 16 Without changing the shape, it is possible to partition the coolant passage of any shape with a simple structure and increase the cooling efficiency of the motor M.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, instead of sandwiching the O-ring 17 between the opening 15b of the stator holder 15 of the case body 12 and the opening 16b of the motor cover 16, the opening 15b of the stator holder 15 and the opening 16b of the motor cover 16 are used. The space is welded 32 in a liquid-tight manner. According to the second embodiment, the number of parts can be further reduced by eliminating the O-ring 17.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

Longitudinal sectional view of a liquid cooling motor according to the first embodiment Exploded perspective view of motor case 3-3 sectional view of FIG. Sectional view taken along line 4-4 in FIG. Schematic diagram of refrigerant passage Longitudinal sectional view of a liquid cooling motor according to the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Motor case 12 Case main body 15 Stator holder 15b Opening part 16 Motor cover 16b Opening part 17 O-ring (seal member)
24 Stator 28 First refrigerant passage component (one refrigerant passage component)
29 Second refrigerant passage component (one refrigerant passage component)
30 First refrigerant passage (refrigerant passage)
31 Second refrigerant passage (refrigerant passage)
32 Welding

Claims (4)

In the liquid cooling motor provided with the refrigerant passages (30, 31) through which the refrigerant flows inside the case body (12) of the motor case (11),
A bottomed cylindrical stator holder (15) that supports the stator (24) on the inner periphery of the case body (12), and a bottomed cylinder that fits with a gap on the outer periphery of the stator holder (15) The liquid-cooled motor is characterized in that the refrigerant passage (30, 31) is formed between the stator holder (15) and the motor cover (16).   The liquid according to claim 1, wherein a seal member (17) is sandwiched between the opening (15b) of the stator holder (15) and the opening (16b) of the motor cover (16). Cold motor.   The liquid cooling type according to claim 1, wherein the opening (15b) of the stator holder (15) and the opening (16b) of the motor cover (16) are liquid-tightly welded (32). motor. The refrigerant passage constituting member (28, 29) that divides the refrigerant passage (30, 31) is disposed between the stator holder (15) and the motor cover (16). The liquid-cooled motor according to claim 3.

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